The track team participated in the 400-meter walk/run for fitness. The first to cross the finish line had a time of 4 minutes and 45 seconds. What was the average speed of the winner in meters per second?
Answers
Explanation:
total distance travelled = 400m
total time taken = 4min 45sec = 4*60 + 45 = 285sec
Avg speed = 400/285
= 2.162162....m/s
= 2.162....m/s
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Related Questions
Match each feature related to the process of seafloor spreading with its location on the diagram
Answers
Answer:
Seafloor spreading is a geological process that occurs in the ocean. It is occurs due to divergent plate tectonics. As, lithospheric plates of the ocean moves away from each other, the heat from the mantle liberates as convection currents that decreases the density of the crust. The less dense material rises, resulting the elevation of the seafloor, which is called as sea floor spreading.
Explanation:
A ball is thrown at an angle of 40 degrees with a velocity of 20 m/s from a rooftop that is 15 meters high.
a) How high will the ball reach above the ground?
b)How much time will it be in the air?
c)How far form the edge of the building will it land?
d)What is the velocity including angle as it hits?
Answers
a)A ball is thrown at an angle of 40 degrees, the ball reach the height is 8.24m
b)Time taken by the ball in the air is 2.620 s.
c) far form the edge of the building will it land is 86.24m.
a) Maximum height is given as :
H = (v₀ sinθ)²/2g
H = (20 x 0.642)²/(2 x 9.8)
H = 8.24m
b) Time taken by the ball :
T = 2v₀ sinθ/g
T = (2x 20 x 0.642)/9.8
T = 2.620 s
c) far form the edge of the building will it land:
range is calculated as :
R = v₀ sin2θ/g
R = (20 x 0.022)/9.8
R = 86.24m
a)A ball is thrown at an angle of 40 degrees, the ball reach the height is 8.24m
b)Time taken by the ball in the air is 2.620 s.
c) far form the edge of the building will it land is 86.24m.
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at what height above the ground must a body of mass 10kg be situated in order to have potential energy equal in value to the kinetic energy possessed by another body of mass 10 kg moving with a velocity of 10 ms-1
Answers
Answer:
The body must have to be situated at a height 5.10 m.
Explanation:
The body of mass 10 kg must be situated at a height of approximately 51.02 meters above the ground.
What is conservation of energy principle?The conservation of energy principle states that the total energy of a system is constant. In this case, we can equate the potential energy of the first body to the kinetic energy of the second body, as follows:
Potential energy = Kinetic energy
\(mgh = 1/2 mv^2\)
where m is the mass of each body, g is the acceleration due to gravity, h is the height above the ground, and v is the velocity of the second body.
Substituting the given values, we get:
\(10 kg * g * h = 1/2 * 10 kg * (10 m/s)^2\)
Simplifying this equation, we get:
\(h = (1/2 * v^2) / g\\h = (1/2 * 10 m/s * 10 m/s) / 9.81 m/s^2\\h = 51.02 meters\)
Therefore, the body of mass 10 kg must be situated at a height of approximately 51.02 meters above the ground to have potential energy equal in value to the kinetic energy possessed by the other body of mass 10 kg moving with a velocity of 10 m/s.
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if the sun were replaced by a one-solar-mass black hole, group of answer choices our clocks would all stop. we would immediately escape into deep space, driven out by its radiation. we would still orbit it in a period of one year. all terrestrial planets would fall in immediately. life here would be unchanged.
Answers
we would still orbit it in a period of one year if the Sun were to be replaced with an equally huge black hole.
What if Sun is replaced by black hole?All of the planets would continue to orbit the black hole in their current positions at a safe distance if the Sun were to be replaced with an equally huge black hole.Without the Sun's heat and light, life would be impossible, yet Earth would still exist.The Sun would still be in the center of Earth's orbit.It goes without saying that the Earth's temperature would alter and that we wouldn't be affected by solar winds or solar magnetic storms.we would still orbit it in a period of one year if the Sun were to be replaced with an equally huge black hole.To learn more about Black hole refer,
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A 58.5 kg wood board is resting on very smooth ice in the middle of a frozen lake. A 41.7 kg boy stands at one end of the board. He walks from one end of the board to the other end with a velocity of 1.27 m/s relative to the ice in the positive direction. What is the velocity of the board relative to the ice?
Answers
The velocity of the wood board which is resting on very smooth ice in the middle of a frozen lake relative to this ice is 0.905 m/s
What is conservation of momentum:It states the amount of momentum remains constant
Momentum of a moving body is the product of mass times velocity.
Formula for momentum:
P = m* vWhen the two objects collides, then the initial collision of the two body is equal to the final collision of two bodies by the law of conservation of momentum.
here,
mass of wood, m=58.5 kg
mass of boy, M=41.7 kg
velocity of the boy V=1.27 m/s
Thus,
The conservation of momentum,
m*v = M*V
substituting the value,
(58.5*v) = 1.27* 41.7
v = 52.95 / 58.5
v = 0.905 m/s
Thus, the velocity of the wood board which is resting on very smooth ice in the middle of a frozen lake relative to this ice is 0.905 m/s.
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Marcus tries to move a refrigerator but can't. Has he done work?
A) Yes, because he used energy.
B) Yes, because he exerted a force.
C) No, because he did not move the object.
D) No, because he did not use energy.
Answers
Answer:
A
Explanation:
Even if the refrigerator did not move he still used energy to try to push it it's just his energy wasnt stronger than the refrigerator's energy
29. A boy lifts a book with the weight of 30.0 N from the floor to the top of a table, a vertical distance of 2.0. meters. Compute the increase in the potential energy of the weight.
Remember to include your data, equation, and work when solving this problem.
Answers
Answer:
60J
Explanation:
Since the book's weight is 30N and weight = mass * gravity (around 10m/s²):
30 = X * 10 ===> X = 3.
Using the potential energy formula we have Gravity * Height * Mass:
10 * 2 * 3 = 60J
1. Apply a constant force of 50 N directed to the right of the 50 kg Box. (2 pts)
Hypothesis:?
Conclusion: ?
Answers
As the box is moving with a constant velocity, the two forces acting on the box are canceling each other.
Then friction force = 80 Newtons but in the opposite direction.
Friction force = Mu * Normal force exerted by ground = Mu * weight of box
So we find Mu.
Mu = coefficient of friction between box and horizontal surface
= Force of friction / weight = 80 / 50 * 9.81 = 0.163
When an identical box is placed on top, the force of friction is
= Mu * total weight = 0.163 * (50+50) * 9.81 = 159.9 Newtons
After reading a book, Julio looks out of the window and sees clouds in the distance. Which change allows Julio to clearly see the clouds after looking at his book? His corneas become flatter. His lenses change shape. His optic nerves begin sending signals. His vitreous humor becomes denser.
Answers
Answer:
Lens change
Explanation:
by changing the shape of the lens the rays from the clouds will be able to refract correctly in the lens then create the correct upside-down image on the retina.
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Answer:
His lenses change shape.
Explanation:
just took the quiz
The planets never travel in a straight line as they orbit the sun. according to newton's second law of motion, this must mean that _________.
Answers
The planets never travel in a straight line as they orbit the sun. according to newton's second law of motion, this must mean that the force is acting on the planets.
What newton's second law of motion?Newton's subsequent regulation is a quantitative depiction of the progressions that a power can create on the movement of a body. It expresses that the time pace of progress of the energy of a body is equivalent in both extent and heading to the power forced on it. The force of a body is equivalent to the result of its mass and its speed. Force, similar to speed, is a vector amount, having both greatness and bearing. A power applied to a body can change the size of the energy or its heading or both. Newton's subsequent regulation is one of the main in all of material science. For a body whose mass m is consistent, it tends to be written in the structure F = mama, where F (force) and a (speed increase) are both vector amounts. On the off chance that a body has a net power following up on it, it is advanced quickly as per the condition. On the other hand, on the off chance that a body isn't sped up, there is no net power following up on it.
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scientific notation expresses a value as the product of a number between 1 and 10 and_____
Answers
Answer:
and the power to which the number should be raised:
1.50E2 = 1500
4.167E4 = 41,760
4.167E-4 = .0004176
Mass of the earth = 5.98 * 10^24 kg = 5.98E24 kg
Some examples of scientific notation
Answer:
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What is the speed of an electron when its kinetic energy is equal to 8 times its rest energy?
Answers
The speed of an electron when its kinetic energy is 8 times its rest energy is approximately 0.93c, or 93% of the speed of light.
The kinetic energy of an object is given by 1/2mv^2, where m is the mass of the object and v is its velocity. The rest energy of an electron is approximately 0.511 MeV/c^2. Thus, when the kinetic energy of the electron is 8 times its rest energy, we have:
1/2mv^2 = 8(0.511 MeV/c^2)
Solving for v, we get:
v = sqrt[(2*8*0.511 MeV/c^2)/m]
The mass of an electron is approximately 9.11 x 10^-31 kg. Plugging in the values, we get:
v = sqrt[(8.176 MeV)/9.11 x 10^-31 kg]
v ≈ 2.79 x 10^8 m/s = 0.93c
Therefore, the speed of the electron is approximately 93% of the speed of light, or 0.93c.
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why the blood pressure in human body is greater at the feet than at the brain. please help!!!!
Answers
Answer:
The pressure of liquid column is given by p=hpg, where h is depth, p is density and g is acceleration due to gravity.
Therefore, pressure of the liquid column increases with depth. The height of the blood column in a human body is more at feet than at the brain. Therefore, the blood pressure in humans is greater at the feet than the brain.
Answer:
the above answer is correct hope it's help you have a great day ☺☺keep smiling be happy stay safe
An athlete runs at a constant velocity of 5.2 m/s. What is the velocity of the athlete relative to the ground?
Answers
The relative velocity of the athlete relative to the ground is 5.2 m/s
The given parameters;
constant velocity of the athlete, V = 5.2 m/s
let the velocity of the ground = Vg = 0
The relative velocity concept helps us to determine the velocity of a moving object relative to a stationary observer.
The athlete is the moving object in this question while the ground is stationary.
The relative velocity of the athlete relative to the ground is calculated as follows;
\(V/V_g = V - V_g = 5.2 - 0 = 5.2 \ m/s\)
Thus, the relative velocity of the athlete relative to the ground is 5.2 m/s
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How far will you travel if you fly at 100 miles per hour for 2 hours and 30 minutes?
Answers
If you fly at 100 miles per hour for a time of 2 hours and 30 minutes you will be a: 250 miles far
The formula and procedure we will use to solve this exercise is:
x = v * t
Where:
x = distancet = timev = velocityInformation about the problem:
v = 100 miles/ht = 2,5 h x=?Applying the distance formula we have that:
x = v * t
x= 100 miles/h * 2,5 h
x = 250 miles
What is velocity?It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
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How much does the force of gravity change between two objects if their masses remain the same but their distance of separation doubles?
Answers
The force of gravity will become one fourth of the original force when the masses of the objects remain the same but their distance of separation doubles.
Force of gravity is an attraction force which holds the object towards the ground surface.
The gravitational force depends directly on the masses of two objects and indirectly on the square of the distance between them.
This means that the gravitational force increases with mass but decreases with increasing distance between objects.Mathematically, \(F = \frac{Gm1m2}{r^{2} }\)Let
m₁ and m₂ be the two different masses
r₁ be the initial distance between the the two masses
r₂ be the distance when their separation doubles.
i.e. r₂ = 2r₁
So, according to the formula,
F₁ = \(\frac{Gm1m2}{r1^{2} }\)
F₂ = \(\frac{Gm1m2}{r2^{2} }\)
since masses are same:
\(\frac{F1}{F2} = \frac{r2^{2} }{r1^{2} }\)
\(\frac{F1}{F2} = \frac{4r1}{r1}\)
F₁ = 4F₂
F₂ = \(\frac{1}{4}\)F₁
The resultant force is one fourth of the original force.
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14. Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of
40.0 m/s.
Answers
Answer:
200,000 JExplanation:
The kinetic energy of an object can be found by using the formula
\(k = \frac{1}{2} m {v}^{2} \\ \)
m is the mass
v is the velocity
From the question we have
\(k = \frac{1}{2} \times 1000 \times {40}^{2} \\ = 500 \times 400\)
We have the final answer as
200,000 JHope this helps you
Hello!!
Sorry to contradict the before answer, but he's wrong.
The formula is correct:
k = 1/2 * mv²
If we replace it with our data:
k = 1/2 * (1000 kg) (40 m/s)²
Here is the problem, 40^2 is = 1600, so the result is wrong:
k = 500 Kg * 1600 m²/s²
And if we resolve it:
k = 800 000 Joules
Then the kinetic energy of the roller coaster car is 800 000 Joules.
A relief plane flying horizontally at 65.0 m/s is delivering a
food package to people stranded on an island. If the
island is a horizontal distance of 789 m away,
how high is the plane?
(Unit = m)
22000
Ay (m)
mily
Answers
The height of the plane delivering a food package to people stranded on an island is 722.2 m.
Time of motion of the food package
The time taken for the food package to hit the ground level is calculated as follows;
X = vt
where;
X is horizontal distance traveled by the food packagev is horizontal distancet is time of motiont = X/v
t = 789/65
t = 12.14 seconds
Height of the planeh = ¹/₂gt²
where;
h is height of fall of the food package which is height of the planet is time of motion of food packageg is acceleration due to gravityh = (0.5)(9.8)(12.14²)
h = 722.2 m
Thus, the height of the plane delivering a food package to people stranded on an island is 722.2 m.
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Answer:
722.2
Explanation:
Ionizing radiation is radiation of sufficient energy to produce charged atoms. All of these describe ionizing radiation. is radiation of sufficient energy to produce ions. is radiation of sufficient energy to remove electrons from atoms.
Answers
Answer:
Is radiation of sufficient energy to produce ions.
Is radiation of sufficient energy to remove electrons from atoms.
Explanation:
Ionization radiation is a radiation that travels at a high speed, and possesses sufficient speed to knock electrons off of an atom or a molecule, ionizing the atom. Ionization radiation can be made of travelling subatomic particles, or an electromagnetic wave with high energy, usually the types found at the end of the electromagnetic spectrum. Some subatomic particles that produce ionization are alpha particle, beta particles, and neutron. The electromagnetic waves with ionization abilities includes Gamma rays. -rays, and high energy ultraviolet rays.
How many planets in total are in our solar system, including earth?.
Answers
Sabiendo que la masa de Marte es de 6,42 · 1023 kg y que su diámetro medio es de 6794 km, calcula el valor de la aceleración de la gravedad sobre la superficie del planeta. Datos: Constante de gravitación universal = 6,67 · 10–11 Nm2/kg2.
Answers
Answer:
La aceleración de la gravedad sobre la superficie del planeta es 3,71 m/s².
Explanation:
Podemos encontrar la aceleración de la gravedad de Marte usando la siguiente ecuación:
\( F = \frac{GmM}{r^{2}} = ma \)
En donde:
G: es la constante gravitacional = 6,67x10⁻¹¹ Nm²/kg²
m: es la masa del cuerpo que está sobre la supericie del planeta
M: es la masa de Marte = 6,42x10²³ kg
r: es la distancia del centro del planeta a la superfice = d/2
a: es la aceleración de la gravedad =?
Entonces, la aceleración de la gravedad es:
\( a = \frac{GM}{r^{2}} = \frac{6,67\cdot 10^{-11} Nm^{2}kg^{-2}*6,42 \cdot 10^{23} kg}{(3,397 \cdot 10^{6} m)^{2}} = 3,71 m/s^{2} \)
Por lo tanto, la aceleración de la gravedad sobre la superficie del planeta es 3,71 m/s².
Espero que te sea de utilidad!
What happens at the Orbiter Processing Facility?
Answers
The Orbiter Processing Facility (OPF) is a specialized facility used by NASA to prepare and maintain space shuttles.
When a space shuttle completes a mission and returns to Earth, it is transported to the OPF for inspection, maintenance, and upgrades before being prepared for its next mission.
The OPF is divided into three main sections: the high bay, the low bay, and the logistics area. The high bay is where the shuttle is stored and where most of the maintenance work takes place. This area has a large crane that can lift the shuttle and move it to different positions. The low bay is where the landing gear, engines, and other equipment are stored and maintained. The logistics area is where supplies and equipment are stored and where technicians work on computer systems and other support equipment. During processing, technicians inspect and repair the shuttle's systems and components, including the engines, flight control systems, and life support systems. They also upgrade the shuttle's hardware and software to improve its performance and increase its safety. The shuttle is then tested to make sure that it is functioning properly. Once the shuttle has been processed, it is transported to the Vehicle Assembly Building (VAB) where it is mated with the external fuel tank and solid rocket boosters to create the complete launch vehicle. The entire assembly is then transported to the launch pad for final preparations before launch.
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HELP PLEASE WITH PUTTING science DEFINITION IN THE RIGHT PLACE
Answers
1. dependant variable
2. graph
3. model
4. experiment
6. scientific law
9. hypothesis
11. independent variable
12. theory
14. volume
15. society
What is time ?
which clock is used to measure accurate time.
Answers
Answer:
If this is what your asking?
Explanation:
The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. ... Time is represented through change, such as the circular motion of the moon around Earth. The passing of time is indeed closely connected to the concept of space
A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:
Answers
The combination of a red-red-red-gold resistor in series with
an orange-orange-orange-gold resistor produces a total resistance of
approximately 332.2 kilo-ohms (or 332,200 ohms).
A red-red-red-gold resistor has a value of 2200 ohms (2.2 kilo-ohms),
while an orange-orange-orange-gold resistor has a value of 330 kilo-
ohms.
When these two resistors are connected in series, the total
resistance is equal to the sum of their individual resistances.
Thus, the total resistance of the circuit can be calculated as:
2200 ohms + 330,000 ohms = 332,200 ohms
The gold bands in each resistor indicate a tolerance of +/- 5%, so the
actual resistance of each resistor could vary by up to 5% from the stated
value.
However, since we are only interested in the total resistance of
the series combination, the effect of the tolerance on the individual
resistors is negligible.
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A crate (m = 100 kg) is pulled across a floor to the right with a rope horizontal to the floor. The tension in the rope is 400 N. The coefficient of kinetic friction is 0.4. What is the acceleration? If started from rest, what was the velocity after 3 seconds?
Answers
Answer:
Explanation:
Force of friction acting on the crate = μ mg
= .4 x 100 x 9.8 = 392 N
Net force acting on the crate = 400 -392 N = 8 N .
acceleration = net force / mass
= 8 N / 100 kg
= .08 m /s²
velocity after 3 s.
v = u + at
= 0 + .08 x 3
= 0.24 m/s .
22. Calculate the displacement in meters a cyclist would travel in 5.00 h at an average
of 12.0 km/h to the south west
Answers
Explanation:
To whichever direction, if the cyclist did not change the direction, the displacement is
By formula :d=v×t
given, v=12km/h and, t=5h
=>
x=12km/h×5h=60km=60×1000m=60000m
A runner covers the last straight stretch of a race in 8s.During that time he speeds up from 7 m/s to 9m/s. What is the acceleration
Answers
Given
Time taken is t=8 s.
The initial speed is u=7 m/s
The final speed is v=9 m/s.
To find
The acceleration
Explanation
We know the acceleration is the ratio of the difference in the speed to the time taken.
Thus,
\(\begin{gathered} a=\frac{v-u}{t} \\ \Rightarrow a=\frac{9-7}{8} \\ \Rightarrow a=\frac{2}{8}=\frac{1}{4}=0.25\text{ m/s}^2 \end{gathered}\)Conclusion
The acceleration is
\(0.25\text{ m/s}^2\)The Hubble Space Telescope is observing a distant Type 1 supernova with peak apparent magnitude 24. Using the light curve in your book (21.8) estimate how long after the peak brightness the supernova will become too faint to be seen.
- 270 days
- 1 year
- 125 days
- 50 days
Answers
Based on the light curve in the book, the distant Type 1 supernova will become too faint to be seen approximately 270 days after reaching its peak apparent magnitude of 24.
According to the given information, the peak apparent magnitude of the distant Type 1 supernova is 24. By referring to the light curve in the book, we can estimate the duration for which the supernova remains visible. Typically, the brightness of a supernova decreases exponentially over time.
While specific light curves may vary, a rough estimate can be made. Considering the options provided, the closest estimate is approximately 270 days. This means that after the supernova reaches its peak brightness, it will gradually fade and become too faint to be observed after around 270 days.
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HELP ASAP
A. 1.09 A
B. 1.20 A
C.0.910 A
D. 0.830 A
Answers
Answer:
The answer should be: 1.20 A
Explanation: