A bag of wheat weighs 50 kg. To what height should it be raised so that its potential energy may be 980 J? Take g = 9.8 ms-.
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- Two particles q1 = (4.985x10^0) nC and (-1.36x10^0) nC are initially (4.008x10^0) metres apart, and then move to (7.695x10^0) metres apart. Calculate the change in potential energy in JoulesAt what speed does a 1100 kg compact car have the same kinetic energy as a 20000 kg truck going 21 km/h ?Express your answer in kilometers per hour.A ball toy of mass 22.7 g is thrown straight up with an initial speed of 2.8 m/s. Neglect air resistance. If the gravitational potential energy is taken to be zero at the maximum height the toy reaches, what uld the gravitational potential energy be in J when it leaves the hand? Give the answer to 2 decimal places
- A 0.34-kg particle has a speed of 3.0 m/s at point A and kinetic energy of 8.1 J at point B. (a) What is its kinetic energy at A?J(b) What is its speed at point B?m/s(c) What is the total work done on the particle as it moves from A to B?JA 0.41-kg particle has a speed of 3.0 m/s at point A and kinetic energy of 8.0 J at point B. (a) What is its kinetic energy at A? (b) What is its speed at point B? m/s (c) What is the total work done on the particle as it moves from A to B? JA box of unknown mass is sliding with an initial speed vi = 6.00 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 2.80 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100. Using energy considerations, determine the final speed of the box (in m/s) after sliding across the rough section of flooring.
- A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?A coconut falls out of a tree 12.0 m above the ground and hits a bystander 3.00 m tall on the top of the head. It bounces back up 1.50 m before falling to the ground. If the mass of the coconut is 2.00 kg, calculate the potential energy of the coconut relative to the ground at each of the following sites: (a) while it is still in the tree, (b) when it hits the bystander on the head, (c) when it bounces up to its maximum height.Humans can produce an output power as great as 20 W/kg during extreme exercise. Sloths are not so energetic. At its maximum speed, a 4 kg sloth can climb a height of 6m in 2 minutes. How much work does the sloth do against gravity to climb 6 m?
- The specialty of an athlete on the women's track team is the pole vault. She has a mass of 60 kg and her approach speed is 8.7 m/s. When she is directly above the bar, her speed is 1.3 m/s. Neglecting air resistance and any energy absorbed by the pole, determine the amount(in m) she has raised herself as she crosses the bar. Answer in Meters.A 0.32-kg particle has a speed of 5.0 m/s at point A and kinetic energy of 8.4 J at point B. (a) What is its kinetic energy at A?J(b) What is its speed at point B?m/s(c) What is the total work done on the particle as it moves from A to B?JA 0.59-kg particle has a speed of 5.0 m/s at point A and kinetic energy of 8.5 J at point B. (a) What is its kinetic energy at A? J(b) What is its speed at point B? m/s(c) What is the total work done on the particle as it moves from A to B? J