Answer:
There are two main ways to determine the age of a rock, these are Relative dating and Absolute dating. Relative dating is used to determine the relative order of past events by comparing the age of one object to another.
Explanation:
Explanation:
rock and fossils are made by layers of dirt, sand,organic matter that has beem compressed over thousands,if not millions of years.
some scientists use this layering to determine how old the earth is.
its kind of like looking at the rings of a tree to see how old it is.
the scientists look at each layer of the rock or fossil and use what they already know about when this type of soil or organic matter existed and try to piece together the past
What is your velocity if you run 100 meters away from your house and it takes you 5 seconds to run that far?
Answer:
velocity = displacement / time taken
velocity = 100/5
velocity = 20m/s
9. A motorcycle accelerates from 10. m/s to 55. m/s in 5.0 seconds. What is the average acceleration of the bike (provide reason)
09.0 m/s/s
O 3.0 m/s/s
O 5 m/s/s
O 11 m/s/s
Answer:
9.0 m/s/s
Explanation:
Given the following data;
Initial velocity = 10 m/s
Final velocity = 55 m/s
Time = 5 seconds
To find the average acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)
Substituting into the equation;
\(a = \frac{55 - 10}{5}\)
\(a = \frac{45}{5}\)
Acceleration, a = 9.0 m/s²
Therefore, the average acceleration of the motorcycle is 9 meters per seconds square because it's experiencing a uniform velocity or motion.
A person ran with a speed of 6 m/s onto the skateboard .What is the speed with which he ride on the skate board
Answer:
First, remember the conservation of energy.
We can define the kinetic energy as:
K = (1/2)*m*v^2
where m is the mass, and v is the velocity.
The velocity of the person is 6m/s, and the mass is unknown.
Now, when the person rides the skateboard, this kinetic energy must remain constant, if M is the mass of the skateboard, the speed after the person rides ir will be:
K' = (1/2)*(m + M)*v'^2
Where v' is the new velocity.
In this case, we can suppose that the skateboard has really small mass compared with the person.
M < < m
then:
(m + M) ≈ m
then:
K' = (1/2)*m*v'^2 = K = (1/2)*m*v^2
from that equation, we can conclude that:
v' = v
Then if the velocity before riding the skateboard was 6m/s, then after would be also 6m/s.
.
What type of research method would best answer the question “How many rivers in Florida have nitrate pollution in them?”
A. relational study
B. cause and effect study
C. field study
Answer:
B causes and effects
Explanation:
because florida have nitrate pollution
Work out the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s.
Answer: 5 joules
Explanation:
mass=m=2.5kg
Velocity=v=2m/s
Kinetic energy=ke
ke=(m x v x v)/2
ke=(2.5 x 2 x 2)/2
Ke=10/2
Ke=5
Kinetic energy=5 joules
The kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.
What is kinetic energy?The energy which an item has as a function of motion is determined by the initial energy. It is described as the effort required to propel a material body from rest to the given velocity.
It is given that:
Mass of the remote-controlled car = 2.5 kg
Velocity of the car = 2 m/s
As we know,
Kinetic energy = k
k = (mv²)/2
As we know,
The mass is a tangible body's mass is the amount of matter it possesses. It's also a metric of inertia or the resistance to velocity when a net force is exerted.
m = 2.5 kg
v = 2 m/s
k = (2.5×2²)/2
k = 10/2
k = 5 Joules
Thus, the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.
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Luke stands on the edge of a roof throws a ball downward. It strikes the ground with 100J of kinetic energy. Luke now throws another identical ball upward with the same initial speed, and this too falls to the ground. Neglecting air resistance, the second ball hits the ground with kinetic energy of____J
A) Less than 100
B) 100
C) 200
D) More than 200
how does the temperature affect the phase of water
Answer:
Temperature affects phase change by slowing down the movement in between the atoms, thus causing a change in kinetic energy, which in turn causes the atoms to undergo forms of combining or a type of disepersion.
Explanation:
Kinetic energy while being the reason phase changes are constant, Kinetic Energy can be caused by other means. Pressure and temperature can affect many other states kinetic energy, which in turn can affect each state of matter. Making a group of atoms or compounds compacts will force the atoms to move closer together thus with a lower net kinetic energy energy. Reducing temperature also works along the same lines. Colder temperatures can slow down atomic movements which in turn will naturally make each atom move close to each other.
With all of the information provided, it is only feasible that pressure and temperature are directly corresponding with the matter and atomic phase change
Could you help me please !!!
A tin of paint has a total mass of 7000g and a volume of 5000 cm³. The empty tin has a mass of 500g. Determine the mass of paint.
Answer:
6500g
Explanation:
7000 - 500 = 6500
The mass of paint will be "6500 g".
Given:
Total mass,
7000 gVolume,
5000 cm³Mass of empty tin,
500 gNow,
The mass of paint will be:
= Total mass - Mass of empty tin
By putting the values, we get
= \(7000-500\)
= \(6500 \ g\)
Thus the approach above is correct.
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Exercises 26 describe a situation. Identify all forces acting on the object and draw a free-body diagram of the object.
A steel beam, suspended by a single cable, is being lowered by a crane at a steadily decreasing speed.
The all forces acting on the steel beam are weight, tension in the cable and air resistance
The forces acting on the steel beam are:
Weight: The force of gravity acting on the steel beam, pulling it downwards.
Tension in the cable: The force exerted by the cable, which is holding the steel beam up and preventing it from falling.
Air resistance: The resistance of the air to the motion of the steel beam.
To draw a free-body diagram of the object, we represent the object as a point and show all the forces acting on it as arrows pointing away from the point. The size of the arrows represents the magnitude of the forces.
The free body diagram is shown in the figure
Where:
T represents the tension force in the cable
W represents the weight force of the steel beam
Note that the air resistance force is usually neglected in such diagrams, as it is often relatively small compared to the other forces.
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which one of the following statements is not correct about galvanometer?
A) it is used to measure small amount of current.
B) it has infinity resistance.
C) it can be used to measure voltage if shunted with large load in series.
D) its working principle is the same as that of the electric motor.
Answer:
B
Explanation:
galvanometer has a small resistance ....
I dont know whether the answer is right...
Two 0.967 kg masses are 4.439 m apart on a frictionless table. Each has 16.074 microCoulombs of charge. What is the initial acceleration of each mass if they are released and allowed to move?
Firstly, we can write the equation for the electric force. It is:
\(F_e=k\frac{q_1q_2}{d^2}\)By applying our values we get
\(F_e=(9*10^9)\frac{(16.074*10^{-6})*(16.074*10^{-6})}{(4.439)^2}=0.118N\)Now, if we remind ourselves of Newton's law, we know that
\(\vec{F}=m.\vec{a}\)We know the mass, and we know the Force, so we can find out the acceleration, this gives us:
\(0.118=0.967*a\)Thus
\(a=\frac{0.118}{0.967}=0.122\frac{m}{s^2}\)Our final acceleration is 0.122 m/s^2
. On a calm, sunny day, the air in the lowest inch or so of the atmosphere is heated primarily by ________.
a. convection
b. conduction
c. direct absorption of solar radiation
d. latent heat release
e. absorption of terrestrial radiation
On a calm, sunny day, the air in the lowest inch or so of the atmosphere is heated primarily by conduction. The other options are incorrect because the sun's radiation is absorbed by the ground, but the ground heats the air through conduction, not direct absorption. option b.
Latent heat release and absorption of terrestrial radiation are unrelated to this phenomenon. What happens on a calm, sunny day? On a calm, sunny day, the air in the lowest inch or so of the atmosphere is heated primarily by conduction. Heat is transmitted from the ground to the air through direct contact. Because the layer of air in contact with the ground is so small, the air heats up quickly, and its temperature rises. Convection is not a significant factor in this process because there is little vertical motion in the air mass closest to the ground.
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Mrs. Botts applies brakes on a car help it to decelerate at the rate of -0.80m/s2. What distance is required to stop the car when it is moving 17 m/s.
Answer:
Explanation:
vf=0
vi = 17
a = -0.8
Δx = ?
vf^2 = vi^2 + 2 a Δx
Δx = (vf^2 - vi^2) / 2a
Δx = (0-17^2) / 2 (-0.8)
Δx = 180.625 m
how much electrical energy does a small heating coil use if it runs for 5 minutes using a 12 volt power supply that provides 2.5 amperes of current?
691.2 W electrical energy does a small heating coil use if it runs for 5 minutes using a 12-volt power supply that provides 2.5 amperes of current.
What is power?
Power refers to the rate at which a work is completed. It can also be defined as the total amount of energy expended in a given period of time. Power is measured in Watt (W).
What is energy?
It is the ability of a system to do work. It is measured Joule (J).
When the work done is said to be one joule?
Work done is said to be one joule when a 1 N of force is applied on an object, and the object moves by 1 m because of the force.
The formulae for power can be expressed as follows
P = \(V^{2}R\)
R = \(\frac{V}{I}\)
As per the question,
V = 12 V, I = 2.5 A
Therefore,
R = \(\frac{12}{2.5}\) = 4.8
Now,
P = 12 x 12 x 4.8 = 691.2 W
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If a 100 ω resistor is placed across a 0. 10 μf charged capacitor which is initially charged to 3 v. How long does it take it to discharge to 2v to 1v?
1. The time taken to discharge to 2 V is 2×10⁻⁹ s
2. The time taken to discharge to 1 V is 5×10⁻¹⁰ s
Energy stored in a capacitorThe energy stored in a capacitor is given by
E = ½CV²
But
E = Pt
Thus,
Pt = ½CV²
Where
E is the energy C is the capacitorV is the voltageP is the power t is the timeWith the formula (Pt = ½CV²), we can determine the time in each case. Detail below:
1. How to determine the time required to discharge to 2 VData obtained from the question include:
Power (P) = 100 wCapacitor (C) = 0.10 μF = 1×10⁻⁷ FVoltage (V) = 2 VTime (t) = ?Pt = ½CV²
100 × t = ½ × 1×10⁻⁷ × 2²
Divide both sides by 100
t = (½ × 1×10⁻⁷ × 2²) / 100
t = 2×10⁻⁹ s
Thus, the time required to discharge to 2 V is 2×10⁻⁹ s
2. How to determine the time required to discharge to 1 VData obtained from the question include:
Power (P) = 100 wCapacitor (C) = 0.10 μF = 1×10⁻⁷ FVoltage (V) = 1 VTime (t) = ?Pt = ½CV²
100 × t = ½ × 1×10⁻⁷ × 1²
Divide both sides by 100
t = (½ × 1×10⁻⁷ × 1²) / 100
t = 5×10⁻¹⁰ s
Thus, the time required to discharge to 1 V is 5×10⁻¹⁰ s
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19. A stone has a mass of 390 g and a density of 2. 7 g/cm3.
Cooking oil has a density of 0. 90 g/cm².
Which mass of oil has the same volume as the stone?
A 130 g
B 160 g
C 900 g
D 1200 g
(Show the working)
Answer:
A
Explanation:
First, we can find the volume of the stone:
\(v(stone) = \frac{m(stone)}{ρ(stone)} = \frac{390}{2.7} ≈144.44 \: {cm}^{3} \)
\(v(oil) = v(stone) = 144.44 \: {cm}^{3} \)
\(m(oil) = v \times ρ(oil) = 144.44 \times 0.90≈130 \: g\)
Which of the following physical or biological changes could result from the breakup of a supercontinent such as Pangaea?
increases in species diversity
reduction in the area of continental interiors
increases in world shoreline
The breakup of a supercontinent such as Pangaea could result in an increase in species diversity.
When a supercontinent breaks up, it leads to the formation of new landmasses, oceans, and environmental conditions. This provides opportunities for species to evolve and adapt to new habitats, which can result in the emergence of new species. Furthermore, the separation of previously connected landmasses can allow for the development of distinct evolutionary lineages, which can further contribute to an increase in species diversity. Thus, the breakup of a supercontinent can lead to an increase in species diversity. On the other hand, the breakup of a supercontinent would not necessarily lead to a reduction in the area of continental interiors or an increase in world shoreline. The area of continental interiors would depend on the size and distribution of the newly formed continents, which could vary depending on the specific tectonic processes involved. Similarly, the amount of world shoreline would depend on the size and position of the new landmasses relative to the oceans, which could also vary.
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Describe the energy conversion in each of these scenarios: a plant using photosynthesis to make food, using a battery-powered flashlight to see at night, and listening to music through a stereo.
Answer:
look it up
Explanation:
Complete the sentence
Answer:
There is no sentence.
Explanation:
mass of a body is 210g and its density is 7.981g/cm^3 what will be its volume with regard to significant figures
those who tell right answer i will make brainliest please fast
Density is mass per unit volume,
\(\rho=\dfrac mV\)
so to get the volume, divide the mass by the density,
\(V=\dfrac m\rho\)
So the volume is
\(\dfrac{210\,\mathrm g}{7.981\frac{\rm g}{\mathrm{cm}^3}}\approx26.312\,\mathrm{cm}^3\approx\boxed{26\,\mathrm{cm}^3}\)
Nuclei decay from a more stable form to a less stable form.Question 9 options:TrueFalse
ANSWER
False.
EXPLANATION
In radioactive decay (or nuclei decay), an unstable nucleus emits radiation into a nucleus that is table and has less energy and a lower mass.
Therefore, nuclei decay from a less stable form to a more stable form.
The answer is false.
which would have more momentum an elephant standing in one place or a small bird slowly flying through the air
Answer:
Elephant
Explanation:
has a larger mass which equates to greater momentum
is compressed 0.15 m0.15 m by a 3.5 n3.5 n force. calculate the work done by the mattress spring to compress it from equilibrium to 0.15 m.
The work done by the mattress spring to compress it from equilibrium to 0.15m is 0.525 Joules.
To calculate the work done by the mattress spring to compress it from equilibrium to 0.15m, we need to use the formula:
Work = Force x Displacement x cos(theta)
In this case, the force applied is 3.5N and the displacement is 0.15m. We can assume that the angle between the force and displacement is 0 degrees (cos(0) = 1).
So, the work done by the mattress spring is:
Work = 3.5N x 0.15m x cos(0)
= 0.525 Joules
Therefore, the work done by the mattress spring to compress it from equilibrium to 0.15m is 0.525 Joules.
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The fission of 1 kg of uranium produces 8.0 × 10^13 J of energy.
a- Calculate the mass, in grams, converted to energy by the fission of 1.05 kg of uranium.
b- What is the ratio of the converted mass to the original mass?
a- The mass, in grams, converted to energy by the fission of 1.05 kg of uranium is 9.34 × 10⁻² g
b- The ratio of the converted mass to the original mass is 8.85 × 10⁻⁶ %.
a- To calculate the mass converted to energy by the fission of 1.05 kg of uranium, we can use the following equation:
Energy = mass x (speed of light)² We are given that the energy produced by the fission of 1 kg of uranium is 8.0 × 10¹³ J.
Therefore, the energy produced by the fission of 1.05 kg of uranium can be calculated as:
Energy = 8.0 × 10¹³ J/kg x 1.05 kg
Energy = 8.4 × 10¹³ J
Now we can rearrange the equation to solve for the mass converted to energy:
mass = Energy / (speed of light)²
mass = 8.4 × 10¹³ J / (3.0 × 10⁸ m/s)²
mass = 9.34 × 10⁻²g
Therefore, the fission of 1.05 kg of uranium converts 9.34 × 10⁻² g of mass into energy.
b- To calculate the ratio of the converted mass to the original mass, we can divide the converted mass by the original mass and multiply by 100% to get the percentage of mass converted:
Ratio = (converted mass / original mass) x 100% Ratio = (9.34 × 10⁻²g / 1.05 kg) x 100%
Ratio = 8.85 × 10⁻⁶ %
Therefore, the ratio of the converted mass to the original mass is 8.85 × 10⁻⁶ %.
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What geologic forces drive tectonic movements?
A- Earth's rotation, geothermal activity, gravitational forces
B- plate subduction, convergence and divergence
C- Earth's orbit, solar winds, electromagnetic waves
D- seismic movement, volcanic activity, plate tension
Seismic movement, Volcanic Activity, Plate Tension
Determine the algebraic signs of alex's x velocity and y velocity the instant before he safely lands on the other side of the crevasse.
The algebraic signs of Alex's x velocity and y velocity the instant before he safely lands on the other side of the crevasse depend on the direction of his motion.
Let's consider the x direction first. If Alex is moving towards the right side of the crevasse, his x velocity would be positive. Conversely, if he is moving towards the left side of the crevasse, his x velocity would be negative.
Now let's focus on the y direction. If Alex is moving upwards as he jumps across the crevasse, his y velocity would be positive. On the other hand, if he is moving downwards, his y velocity would be negative.
In summary,
- If Alex is moving towards the right side of the crevasse, his x velocity is positive.
- If Alex is moving towards the left side of the crevasse, his x velocity is negative.
- If Alex is moving upwards, his y velocity is positive.
- If Alex is moving downwards, his y velocity is negative.
It is important to note that without more specific information about the direction of Alex's motion, we cannot determine the exact algebraic signs of his velocities. However, this explanation covers the general cases and provides a clear understanding of how the algebraic signs of velocity depend on the direction of motion.
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What is the speed of a kite that travels 120 meters in 4 seconds?
Answer:
30m/s
Explanation:
Use the formula
V= d /t
a charged particle is immersed in a uniform magnetic field coming out of the page and is moving along a circular path in the counter-clockwise direction. what is the charge of the particle in this situation?
The charge of the particle in this situation is positive. When a charged particle is immersed in a uniform magnetic field, it experiences a force known as the Lorentz force, which is given by the equation:
F = q(v × B)
Where F is the Lorentz force, q is the charge of the particle, v is the velocity of the particle, and B is the magnetic field.
In this case, the particle is moving along a circular path in the counter-clockwise direction, which means that the force acting on the particle is directed towards the center of the circle. This force is known as the centripetal force, and it is given by the equation:
F = mv^2/r
Where m is the mass of the particle, v is the velocity of the particle, and r is the radius of the circle.
Since the Lorentz force and the centripetal force are equal in magnitude and opposite in direction, we can equate the two equations to get:
q(v × B) = mv^2/r
Rearranging the equation and solving for q gives:
q = mv^2/(rB)
Since the particle is moving in the counter-clockwise direction, the velocity vector v is directed tangentially to the circle, and the magnetic field vector B is directed out of the page. The cross product of these two vectors is directed towards the center of the circle, which means that the charge of the particle must be positive in order for the Lorentz force to be directed towards the center of the circle.
Therefore, the charge of the particle in this situation is positive.
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You ride your bike at a constant speed of 5 for 300 a from your house to the mailbox What was your acceleration for the trip? (1 point)
00
05
O 300 s
Since the speed is the same through out, acceleration for the trip will be zero.
What is Acceleration ?Acceleration is the rate at which velocity is changing. It is a vector quantity.
If you ride your bike at a constant speed of 5 m/s for 300 s from your house to the mailbox, your acceleration for the trip will be equal to zero.
Because Acceleration = Change in speed ÷ time
Since the speed is constant, acceleration = 0/time = 0
Therefore, the acceleration for the trip is zero.
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Answer:
0 m/s^2
Explanation:
No change in speed or direction = constant velocity = no acceleration.
Two resistors, one with resistance R and the second with resistance 4R are placed in a circuit with a voltage V. If resistance R dissipated power P, what would be the power dissipated by the 4R resistance?
A) 4P
B) 2P
C) 1/2P
D) 1/4P
The power dissipated by a resistor is given by the formula P = V^2/R, where V is the voltage across the resistor and R is its resistance.
For the resistor with resistance R, the power dissipated is given as P.
For the resistor with resistance 4R, the voltage across it will be the same as the voltage across the R resistor (since they are connected in the same circuit), but the resistance is four times greater.
Using the formula for power, we get:
P = V^2/R
P' = V^2/(4R)
To compare the powers dissipated by the two resistors, we can simplify the expressions by eliminating the voltage V:
P/P' = (V^2/R) / (V^2/(4R))
P/P' = 4
Therefore, the power dissipated by the 4R resistor is four times the power dissipated by the R resistor.
Answer: A) 4P
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