The quantum mechanical model of the atom, each subshell is characterized by a letter designation that corresponds to its value of l. The subshell with l=1 is the p subshell, which can hold a maximum of 6 electrons.
Therefore, the element to which this atom belongs must have its highest-energy valence electrons in the 5p subshell. There are several elements that have their valence electrons in the 5p subshell, including antimony (Sb), tellurium (Te), and iodine (I).
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Can Pineapple be on pizza
Answer:
yes quite a few people love eating Pineapple on pizza
Answer:
yes, if you want pineapple be in pizza
A horse runs for 15 seconds to the south at a speed of 12 m/s. What is the
displacement of the horse in this time?
A. 180 m south
B. 150 m south
C. 150 m
D. 180 m
Answer: 180 m south
Explanation:
The displacement of the horse in this time is 180 m south. The correct option is A.
What is displacement?The displacement is the shortest distance travelled by the particle. It is the vector quantity which re[presents both the magnitude and direction.
Velocity is the time rate of change of displacement with time.
Given is a horse runs for 15 seconds to the south at a speed of 12 m/s. So, the displacement is
Displacement = Speed x Time
Put the values, we get
Displacement = 12 m/s x 15s
= 180 m
Thus, the displacement of the horse in this time is 180 m south.
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A baseball is thrown straight up into the sky. What type(s) of energy is (are) present when the baseball reaches the apex of the throw
O GPE and KE
O entirely KE
O mostly GPE and a little KE
O entirely GPE
entirely KE type of energy is present when the baseball reaches the apex of the throw.
How much power is expended when tossing a baseball?Motion is created by kinetic energy. Kinetic energy is produced by the players who swing the bat and throw the ball, and it is present in both the swinging bat and the pitched ball.
The ball will only have kinetic energy when it is thrown since the would be zero (taking reference at the same position). The speed of the ball, or its kinetic energy, diminishes as it rises, but its height, or its potential energy, increases.
The ball's kinetic energy is dwindling and its gravitational potential energy is rising as it ascends. The cannon ball's kinetic energy is zero when it reaches the top of its arc.
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a 42 kg pole vaulter running at 13 m/s vaults over the bar. her speed when she is over the bar is 1.7 m/s. neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
The altitude of the vaulter when she crosses the bar is 7.26 meters below the starting point when speed is 1.7m/s neglecting energy.
The energy conservation law is being applied in this case where a 42 kg pole vaulter running at 13 m/s vaults over the bar.
Her speed when she is over the bar is 1.7 m/s.
The altitude when she crosses the bar is to be determined.
Neglect air resistance as well as any energy absorbed by the pole.
The law of conservation of energy states that energy cannot be created or destroyed.
Energy can only be transformed from one form to another, such as from kinetic energy to potential energy.
The sum of the kinetic energy and the potential energy is constant over time.
This means that if an object's potential energy increases, its kinetic energy decreases by the same amount.
The law of conservation of energy applies to this case because the vaulter's total energy (kinetic plus potential) is conserved from the beginning of the jump to the point where she crosses the bar.
Therefore, the kinetic energy of the vaulter when she was running is equal to the sum of her kinetic and potential energy when she crosses the bar.
Energy conservation equation
The energy conservation equation is given by:
KEi + PEi = KEf + PEf
Where,
KEi is the initial kinetic energy of the vaulter
PEi is the initial potential energy of the vaulter
KEf is the final kinetic energy of the vaulter
PEf is the final potential energy of the vaulter
Given,The mass of the vaulter, m = 42 kgThe initial velocity of the vaulter, vi = 13 m/s
The final velocity of the vaulter, vf = 1.7 m/sLet h be the height of the vaulter when she crosses the bar.
Initial kinetic energy of the vaulter, KEi = 0.5 m vi²Initial potential energy of the vaulter,
PEi = mgh
Final kinetic energy of the vaulter, KEf = 0.5 m vf²
Final potential energy of the vaulter,
PEf = mgh + mgh
Therefore, by energy conservation,0.5 m vi² = 0.5 m vf² + mgh + mgh
Simplifying the above equation,
h = (vi² - vf²) / 2g + (vf² / 2g) - (vi² / 2g)h = (13² - 1.7²) / (2 x 9.8) + (1.7² / (2 x 9.8)) - (13² / (2 x 9.8))h = 1.26 + 0.15 - 8.67
h = -7.26
The negative sign indicates that the height of the vaulter when she crosses the bar is below the starting point. Therefore, the altitude of the vaulter when she crosses the bar is 7.26 meters below the starting point.
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In this problem, you will calculate the location of the center of mass for the Earth-Moon system, and then you will calculate the center of mass of the Earth-Moon-Sun system. The mass of the Moon is 7.35×1022 , the mass of the Earth is 6.00×1024 , and the mass of the sun is 2.00×1030 . The distance between the Moon and the Earth is 3.80×105 . The distance between the Earth and the Sun is 1.50×108 .
Calculate the location of the center of mass of the Earth-Moon system. Use a coordinate system in which the center of the Earth is at and the Moon is located in the positive x direction.
The center of mass of the Earth-Moon system is located closer to the center of the Earth due to the Earth's much larger mass compared to the Moon. It is located along the line connecting the centers of the two bodies.
To calculate the location of the center of mass of the Earth-Moon system, we can use the formula for the center of mass:
x_cm = (m1 * x1 + m2 * x2) / (m1 + m2),
where x_cm is the position of the center of mass, m1 and m2 are the masses of the Earth and the Moon, and x1 and x2 are the positions of the Earth and the Moon, respectively.
Given the mass of the Moon (7.35×10^22 kg) and the Earth (6.00×10^24 kg), and the distance between them (3.80×10^5 km), we can calculate the x_cm. Since the Moon is located in the positive x direction, x1 = 0 and x2 = 3.80×10^5 km.
Plugging these values into the formula, we get:
x_cm = \((6.00×10^24 kg * 0 + 7.35×10^22 kg * 3.80×10^5 km) \\6.00×10^24 kg + 7.35×10^22 kg\)).
After performing the calculations, we find that the center of mass of the Earth-Moon system is located at approximately 3.52 km from the center of the Earth in the positive x direction. Thus, the center of mass is closer to the center of the Earth due to its much larger mass compared to the Moon.
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What is the velocity of a rocket traveling at as it goes to outer space; traveling a distance of 100 meters in 50 seconds
Based on the information that the speed
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
Answer:
The fireworks give off heat.
Explanation:
What do life tables and survivorship curves show us? Why would we want to make a survivorship curve or life table for an organism? Explain.
Governments around the world keep records of human birth and death rates not just for the overall population of a country but also for specific groups within it, broken down by age and sex. Often, this data is arranged in summary tables called life tables. Enterprising Insurance companies make good use of these life tables, taking the probability of death at a given age and using it to calculate insurance rates that, statistically, guarantee a tidy profit.
Ecologists often collect similar information for the species they study, but they don't do it to maximize profits! They do it to gain knowledge and, often, to help protect species. Take, for example, ecologists concerned about the endangered red panda. They might follow a group of red pandas from birth to death. Each year, they would record how many pandas had survived and how many cubs had been born. From this data, they could better understand the life history, or typical survival and reproduction pattern, of their red panda group.
What's the use of a life history? In some cases, ecologists are just plain curious about how organisms live, reproduce, and die. But there is also a practical reason to collect life history data. By combining birth and death rates with a "snapshot" of the current population-how many old and young organisms there are and whether they are male or female-ecologists can predict how a population is likely to grow or shrink in the future. This is particularly important in the case of an endangered species, like the red pandas in our example.
Life tables summarize the probabilities of survival and mortality for individuals of different age groups within a population.
By studying the life history of endangered species, ecologists can identify critical life stages and factors influencing population declinesLife Tables show how long different age groups are likely to live, and how many people survive at each age.
By examining life tables, ecologists can:
Find out how long people are expected to live in a group.Find out how likely people of different ages are to die and how long they are expected to live.Survivorship curves show how many individuals in a population survive over a period of time.
They make a graph that shows how many people are still alive at each age. Survivorship curves help us understand different things about living organisms.Ecologists who study animals that are in danger of becoming extinct, like red pandas, use life tables and survivorship curves to learn many things.
They give really important information about how many animals die and survive. This helps make plans to protect the species.They help find important times in an animal's life when we need to help them, like keeping their homes safe or helping them have babies.What is survivorship?Life tables assist us in comprehending the variations in the size of a population, death rates that correspond to specific age groups, and the complete biography of a species.
Survivorship curves visually illustrate the proportion of individuals who survive at each age throughout their lives. They provide a depiction of the typical mortality trends present in a group of individuals and aid in recognizing unique approaches to survival.
Survivorship curves show how many individuals in a population survive over a period of time. They make a graph that shows how many people are still alive at each age. Survivorship curves show how many animals or people will survive or die in a population over time.
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Radio waves have the shortest wavelength.
True or False?
Answer:
false.
Explanation:
Radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.
Write an expression to calculate the torque applied by an unknown force on an object that was initially at rest. Assume that you know how fast it is spinning after the torque has been applied, how long the torque has been applied, and the moment of inertia of the object only.
The torque applied is directly proportional to the angular acceleration and the moment of inertia, and inversely proportional to the time the torque is applied.
To calculate the torque applied by an unknown force on an object initially at rest, we can use the following expression:
Torque (τ) = Moment of Inertia (I) × Angular Acceleration (α)
First, find the angular acceleration (α) using the given information. Angular acceleration can be calculated as:
α = Δω / Δt
Where Δω is the change in angular velocity (final angular velocity - initial angular velocity), and Δt is the time duration for which the torque has been applied.
Since the object is initially at rest, its initial angular velocity is 0. Therefore, Δω is equal to the final angular velocity.
Now, plug the value of α into the torque equation:
τ = I × α
This expression will give you the torque applied by the unknown force on the object, given the moment of inertia (I), final angular velocity, and the time duration of the applied torque.
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Laplace Transform problem (20 points) 1) Transform the circuit to the Laplace domain 2) Find the expression for current \( I_{S}(s) \) in the Laplace domain (no need to do the inverse Laplace transfor
1) Transform the circuit to the Laplace domain In the circuit given, I is the current flowing through the inductor and R1 and R2 are the resistance of the resistors. V is the voltage across the inductor.
The given circuit can be transformed into the Laplace domain by applying the basic formulae.
Using Ohm's Law, V = IRi.e., I
= V/R
Substituting R1 + R2 as R, we get I
= V/R ...(1)The voltage V across the inductor L is given by:
L(di/dt) + Ri = V => L(di/dt) = V - Ri
Now, taking Laplace transform on both sides, we get:
L(sI(s) - i(0)) + R(I(s))
= V(s)
=> I(s)
= [V(s) + Li(0)]/[sL + R]
Thus, the transformed circuit in Laplace domain is as follows:
2) Find the expression for current \(I_{S}(s)\) in the Laplace domain (no need to do the inverse Laplace transform)
By Kirchoff's Current Law, I1 + I2 = I
where I1 is the current passing through the resistor R1 and I2 is the current passing through the resistor R2 and I is the current passing through the inductor L.
We can use Ohm's Law to represent I1 and I2 in terms of voltage V across the inductor and R1 and R2 respectively.
Substituting the values of I1 and I2 in the above equation, we get V/R1 + V/R2 = I(s)Now, substituting the value of V from above, we get:
I(s) = V/R
= L(di/dt + I(s))/R1 + L(di/dt + I(s))/R2
=> I(s)
= [sL + (R1 + R2)]/[s^2L + s(R1 + R2)]
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A projectile is launched with an initial speed of 12 m/s. At its highest point its speed is 6 m/s.
A projectile is launched with an initial speed of 12 m/s. At its highest point its speed is 6 m/s and the launch angle of the projectile is 60 degrees.
Given,
Vo = 12m/seg
Vx= 6 m/seg
α=?
Vx = Vox = 6 m/seg
Vox = Vo*cosα
Cosα = Vox/Vo
Cos α = 6m/seg/ 12 m/seg
Cos α = 0.5
α = cos⁻¹ ( 0.5 )
α = 60º
An object that is “projected” or thrown, which has no capacity for self-propulsion. For low speed objects with reasonable mass, e.g. a shot put, or a baseball, tennis ball or golf ball tossed softly across a room, the ideal projectile model “fits” relatively well.
For high speed objects, e.g. a hit or thrown baseball, a well-hit golf ball or tennis ball, etc., drag and other forces are significant and our ideal model is not accurate. For example, a well-hit home run, by ideal theory, will travel nearly 750 ft. In reality it only travels around 450 ft—a significant difference.
If the only force is weight, then the x velocity stays constant and the y velocity changes with time and position : If the only force is weight, then the x velocity stays constant (ax = 0). The y velocity changes with time and position (y acceleration ay = -g).
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A boat trip travels are 15 miles in the direction of 45° east of north for an hour the boat then turn and travels at 18 m/s in a direction 5° north of East for an hour
Answer:
Hello your question is incomplete below is the missing piece
What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number.
answer : 25.73 m/s
Explanation:
Given
V1 = 15 miles/hour = 6.71 m/s [ 45° EN ]
V2 = 18 m/s [ 5° NE ]
Calculate the resultant velocity
Vr = 6.71 m/s[45°] + 18m/s[5°].
Vr = ( 6.71 *Cos45° + 6.71 *sin45°) + ( 18 *Cos5° + 18*sin5° )
Vr = ( 4.74 + 4.74 i )+ ( 17.93 + 1.57i) = 22.67 + 12.18i.
Therefore the magnitude
= \(\sqrt{22.67^2 + 12.18^2}\) = 25.73 m/s
A constant force of 12 N acts for 5 s on a 5 kg object. What is the change in object’s velocity?
Answer:
"solve: given that F -12 N and time 4 seconds and let we have to find out the P.
F = 12 N
t = 4 s
p = ?
F = m×( v - u ) / t
12 = m×v / 4
m×v = 12× 4
p = 48 kg m/s
Linear momentum will be 48 kg m/s.
Explanation:
A uniform electric field of magnitude 1.1 x 104 N/C is perpendicular to a square sheet with sides 2.0 m long. What is the electric flux through the sheet?
The electric flux through the square sheet is \(4.4 * 10^4 Nm^2/C\), when a uniform electric field of magnitude \(1.1 * 10^4 N/C\) is perpendicular to a square sheet with sides 2.0 m long.
The electric flux through a closed surface is given by the formula:
\(\[ \Phi = \mathbf{E} \cdot \mathbf{A} \]\)
where \(\(\Phi\)\) is the electric flux, \(\(\mathbf{E}\)\) is the electric field, and \(\(\mathbf{A}\)\) is the area vector of the surface. In this case, the electric field \(\(\mathbf{E}\)\) is perpendicular to the square sheet, and the magnitude of the electric field is given as \(1.1 * 10^4 N/C\).
The area of the square sheet is \(\(A = (2.0 \, \text{m})^2 = 4.0 \, \text{m}^2\)). Since the electric field is perpendicular to the surface, the angle between the electric field and the area vector is 0 degrees.
Substituting the values into the formula, we have:
\(\[ \Phi = (1.1 \times 10^4 \, \text{N/C}) \cdot (4.0 \, \text{m}^2) = 4.4 \times 10^4 \, \text{N} \cdot \text{m}^2/\text{C} \]\)
Therefore, the electric flux through the square sheet is \(4.4 * 10^4 Nm^2/C\).
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when light passes through a prism of glass, the
C) Refraction alters the directions of various colours or light wavelengths.
Light enters a prism through one face and is refracted as it passes through the glass. The refracted light bends at different angles for different colors or wavelengths. The different colors are then split apart and exit the prism at different angles, creating a spectrum of colors.This occurs because the glass of the prism has different refractive indices for different wavelengths of light. As a result, when white light passes through the prism, the different colors of light refract at different angles, creating a rainbow of colors. The different angles of refraction cause the light to spread out, creating the visible spectrum of colors.
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complete question:When light passes through a prism of glass,
A) the prism absorbs colors from different parts of the broad beam coming out of the prism, leaving the complementary colors that we see.
B) different colors are caused by multiple reflections within the prism and the resulting interference between the beams.
C) refraction changes the directions of different colors or wavelengths of light.
D) the prism adds colors to different parts of the outgoing and broadly scattered beam.
If a geothermal power plant produces 6000 watts of power for every 13000 watts of heat from water, what is its efficiency?
If a geothermal power plant produces 6000 watts of power for every 13000 watts of heat from water, so its efficiency is 46%.
What is efficiency?Efficiency is defined as the proportion of energy which is wasted during a process. The rate at which energy is wasted needs to be reduced and there are a many ways to save energy, such as thermal energy. The formula of efficiency is equals to useful power out divided by total power in. Mathematically it is written as
Efficiency = useful power out ÷ total power in
Some amount of energy is always wasted from every machine, the efficiency should always be less than 1 or less than 100%. No machine is 100 percent efficient.
So we can conclude that if a geothermal power plant produces 6000 watts of power for every 13000 watts of heat from water, so its efficiency is 46%.
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power sources connected in parallel should have the same VOLTAGE OUT PUT:T/F
Power sources that are connected in parallel should have the same voltage output. This statement is true.
What does it mean when we say two power sources are connected in parallel? Power sources are connected in parallel to increase the current output. This means that the positive terminals of the power sources are connected to the other positive terminals, and the negative terminals of the power sources are connected to the other negative terminals. This results in the voltage output remaining the same, but the current output increasing. This is useful when more current is required for a particular application. To summarize, when power sources are connected in parallel, the voltage output should remain the same, and the current output should increase.
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Indicar verdadero (V) o falso (F) con respecto al movimiento parabólico : la componente horizontal de la velocidad permanece constante. ( ) la componente vertical de la velocidad puede ser nula en un instante. ( ) La velocidad en todo momento es tangente a la trayectoria. ( )
Answer:
a) true, b) true, c) false
Explanation:
Este ejercicio de cinemática se pide revisar varias afirmaciones
a) Cierta. La velocidad horizontales consta
b) cierto. La velocidad vertical disminuye hasta llegar a cero en su altura máxima, la aceleración es negativa
C) False. Si la velocidad es tangente a la trayectoria el movimiento debe ser circular, pero este movimiento es parabólico
Traduction
This exercise in kinematics asks you to review several statements
a) true. The horizontal speed consists
b) true. The vertical speed decreases until it reaches zero at its maximum height, the acceleration is negative
C) False. If the speed is tangent to the path, the movement must be circular, but this movement is parabolic.
With respect to parabolic motion:
the horizontal component of the velocity remains constant is Truethe vertical component of the velocity can be null in an instant is True since the velocity changes with time due to gravitation acceleration. At the highest point of the projectile trajectory, the vertical velocity becomes zero.Speed at all times is tangent to the trajectory is True. The parabolic path of the trajectory is because of the changing vertical velocity.Con respecto al movimiento parabólico:
La componente horizontal de la velocidad permanece constante es True la componente vertical de la velocidad puede ser nula en un instante es True ya que la componente vertical de la velocidad cambia con el tiempo debido a la aceleración de la gravitación. En el punto más alto de la trayectoria del proyectil, la velocidad vertical se vuelve cero. La velocidad en todo momento es tangente a la trayectoria es Verdadera. La trayectoria parabólica de la trayectoria se debe a la velocidad vertical cambiante.Learn more about Parabolic motion:
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a car traveling at a constant velocity of magnitude 45.0 m/s passes a trooper hidden behind a billboard. one second after the speeding car passes the billboard; the trooper sets out from the billboard to catch it, accelerating at a constant rate of 3.00 m/s2. how long does it take the trooper to overtake the speeding car?
it takes the trooper 15.0 seconds to overtake the speeding car. Note that this is the time from when the trooper starts accelerating, so the total time from when the car passes the billboard is 15.0s + 1.0s = 16.0s.
The time it takes for the trooper to overtake the speeding car can be found using the equations of motion for constant acceleration. The position of the speeding car at time t is given by:
x_car = v_car*t + x0_car
where v_car is the constant velocity of the car (45.0 m/s), t is the time, and x0_car is the initial position of the car (0 m). The position of the trooper at time t is given by:
x_trooper = (1/2)*a_trooper*t^2 + v0_trooper*t + x0_trooper
where a_trooper is the constant acceleration of the trooper (3.00 m/s^2), v0_trooper is the initial velocity of the trooper (0 m/s), and x0_trooper is the initial position of the trooper (0 m). The trooper overtakes the speeding car when their positions are equal:
x_car = x_trooper
Substituting the expressions for the positions of the car and trooper gives:
v_car*t + x0_car = (1/2)*a_trooper*t^2 + v0_trooper*t + x0_trooper
Rearranging and simplifying gives:
(1/2)*a_trooper*t^2 - v_car*t = 0
This is a quadratic equation that can be solved for t using the quadratic formula:
t = (-b ± √(b^2 - 4*a*c))/(2*a)
where a = (1/2)*a_trooper, b = -v_car, and c = 0. Plugging in the values for a, b, and c gives:
t = (-(-v_car) ± √((-v_car)^2 - 4*(1/2)*a_trooper*0))/(2*(1/2)*a_trooper)
Simplifying gives:
t = (v_car ± √(v_car^2))/(a_trooper)
The negative solution for t is not physically meaningful, so the positive solution is the time it takes for the trooper to overtake the speeding car:
t = (v_car + √(v_car^2))/(a_trooper)
Plugging in the values for v_car and a_trooper gives:
t = (45.0 m/s + √((45.0 m/s)^2))/(3.00 m/s^2)
t = 15.0 s
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A 0. 001 kg bullet is fired with a velocity of 800 m/s into a soft wood of mass 1 kg, resting on a smooth surface. What is the impulse of the bullet?
The impulse of a bullet is the product of the force and the time for which it is applied to the object. The impulse of a bullet can be calculated using the equation.The impulse of the bullet is 0.8 Ns.
Impulse = Force x Time.The given question states that a 0.001 kg bullet is fired with a velocity of 800 m/s into a soft wood of mass 1 kg, resting on a smooth surface. To calculate the impulse of the bullet, we need to determine the force applied to the wood by the bullet during the time of impact.First, let us find the initial momentum of the bullet, which is:Initial momentum = mass x velocity = 0.001 kg x 800 m/s = 0.8 kg m/sWhen the bullet hits the wood, it comes to rest. Therefore, the final velocity of the bullet is 0 m/s. To find the force exerted on the wood, we can use the law of conservation of momentum.
The total momentum of the system before the collision is equal to the total momentum of the system after the collision, which is:Initial momentum of bullet = Final momentum of bullet + Momentum of wood0.8 kg m/s = 0 + (mass of wood) x (final velocity of wood)We know that the mass of wood is 1 kg and the final velocity of wood is unknown. Solving for final velocity of wood gives:Final velocity of wood = 0.8 m/sSo, the change in velocity of the wood is:Δv = final velocity - initial velocity = 0.8 m/s - 0 m/s = 0.8 m/sThe time of impact can be calculated using the equation:Time = Δv / aWhere, a is the acceleration of the wood, which can be found using the equation:F = maF = mΔv / tTherefore,a = F / m = (mΔv / t) / m = Δv / tSubstituting the given values, we get:a = 0.8 m/s / 0.001 s = 800 m/s²The time of impact is:Time = Δv / a = 0.8 m/s / 800 m/s² = 0.001 sTherefore, the force exerted on the wood by the bullet is:F = ma = 1 kg x 800 m/s² = 800 NThe impulse of the bullet can be calculated using the equation:Impulse = Force x Time= 800 N x 0.001 s= 0.8 NsAnswer: The impulse of the bullet is 0.8 Ns.
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write 100000 as a power of ten with one figure before the decimal point
Answer:
1.00000 x10^5 (or 1. x 10^5 )
Explanation:
Count the number of 0's ...this is the power of 10
A student wants to use all of the appliances at the same time so plugs them in to a multiway socket.
The socket has a maximum safe current of 30A and the mains electricity is 230V.
a. Is it safe to use all five appliances at once?
Explain your answer showing your use of the equation
Answer:
The answer would be no
Explanation:
because the voltages are so high, we can assume that 5 appliances divided up between the voltages would not be safe to use together and would ultimately cause the circuits to overload
help please
4. Explain in detail the effect that interstellar dust has on the light from stars. 5. a) How are emission and reflection nebulae different? b) What is the source of the glow of each? 6. Describe the
Interstellar dust scatters and absorbs light from stars, causing them to appear redder and dimmer than they would without dust.
Interstellar dust is made up of tiny particles, ranging from a few molecules to a few micrometers in size, that are found throughout the interstellar medium. When light from a star passes through the dust, it can be scattered in many different directions or absorbed by the dust particles.
This causes the starlight to appear dimmer and redder than it would be without dust. The reddening occurs because dust scatters blue light more efficiently than red light, causing blue light to be preferentially absorbed.
The overall effect of interstellar dust is known as extinction, which can make it difficult for astronomers to observe and study distant stars and galaxies.
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7.82 x 10^4 m = 7.82 x 10^? km
Help me please
Answer:
78.2 km
Explanation:
km is greater unit than meter and 1 km has 1000m so divide 78200 by 1000 we get 78.2 km so answer would be 7.82 x 10^1
10 points!! and brainlest to most correct and detailed answer
Read each statement, and write in the blank the word or words that best completes the statement.
16. Two or more liquids that can dissolve into each other are referred to as _________________________.
17. Tooth fillings are often made of gold or porcelain because those materials are not _________________________.
18. Ice floats in water because it is _________________________ than water.
19. Wheat ground into flour is an example of a(n) _________________________ change.
Answer:
16. Two or more liquids that can dissolve into each other are referred to as miscible.
17. Tooth fillings are often made of gold or porcelain because those materials are not soluble.
18. Ice floats in water because it is less dense than water.
19. Wheat ground into flour is an example of a(n) physical change.
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A stone dropped from the roof of a single-story building to the surface of the earth:
A.
falls because of the natural tendency of all objects to rest on the surface of the earth.
B.
reaches a maximum speed quite soon after release and then falls at a constant speed thereafter.
C.
speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth.
D.
speeds up because of an almost constant force of gravity acting upon it.
E.
falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward.
Answer:
D
Explanation:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion.
A=9.8m/s^2 or the gravitational accelerational
If a stone dropped from the roof of a single-story building to the surface of the earth speeds up because of an almost constant force of gravity acting upon it,there4fore the correct answer is option D.
What is gravity?It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another,
For any free-falling object, the acceleration due to gravity is constatant.
The correct response is option D if a stone thrown from the roof of a one-story structure to the surface of the ground accelerates due to an almost constant force of gravity acting upon it.
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One of the great triumphs of spectroscopy was when astronomers identified a new element in the sun (one that was only later found on earth). today, this element is called?
When Helium is identified by astronomers is one of the great triumphs of spectroscopy.
Janssen managed to do this great triumph on August 18, 1868. Janssen was the first person to introduce the helium, an element that never seen before on Earth, in the solar spectrum. At that time, he didn’t know what he’d seen—he just think that it was something new. In the mid of 1800, the spectroscope instrument is introduced in astronomy which opens up new ideas for spectroscopy.
Later on, we heard that all helium in Universe has been created by the fusion of hydrogen nuclei.
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A box is raised at constant speed by a man pulling up on a rope. Assume that air resistance on the box is negligible. During the ascent, which of these statements are true? a. The work performed by all conservative forces on the box is 0. b. The work performed by all non-conservative forces on the box is 0.
c. The net work performed on the box is 0. d. The work performed by all conservative forces on the box is positive.
e. The work perfomed by all non-conservative forces on the box is positive.
During the constant-speed ascent of a box pulled up by a man with negligible air resistance, the work performed by conservative forces on the box is zero, and the net work performed on the box is also zero.
When the box is raised at a constant speed, the force applied by the man pulling the rope is equal in magnitude but opposite in direction to the gravitational force acting on the box. Since the box moves with constant speed, the net force acting on it is zero.
The work done by a force is given by the product of the force and the displacement of the object in the direction of the force. In this case, the displacement is upward, while the gravitational force and the force applied by the man are in the opposite direction. Therefore, the work performed by the conservative forces, which include the gravitational force, is zero.
Similarly, since the box moves with constant speed, there is no change in its kinetic energy, and hence the work performed by non-conservative forces, such as friction, is also zero. Thus, both statements a and b are true. The net work performed on the box is zero because the work done by the conservative forces cancels out the work done by the non-conservative forces.
Overall, the work-energy theorem states that the work done on an object is equal to its change in kinetic energy. In this case, as the box moves with constant speed, there is no change in kinetic energy, so the net work performed on the box is zero.
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If a sample of an unknown material with a mass of 0.68 g and a volume of 0.8 cm3 is dropped
into maple syrup, will it sink or float? maple syrup has a density of 1.33 g/cm3