A warehouse worker lifts a 10 kg box a half a meter. How much work has the worker done? (Assume g = 10 m/s2).

A weight lifter bench‑presses a 150.0 kg barbell from his chest to a height equal the length of his arms, 0.850 m. How much work does he do? How many food calories does the weight lifter use if he does this lift 35 times? Assume the weight lifter does no work in letting the barbell drop back to his chest.

A man starts at ground level and carries a 20 kg box up a flight of stairs to a height of 3.6 m. He then carries the box down an adjacent flight of stairs back to ground level and ends up 10 m away from where he started. What is the total amount of work the man has done? Explain

A single conservative force acts on the a 5.0 kg object.  The equation Fx = 2x + 4 describes the force, where x is in meters.  As the object moves along the x axis from x = 1.0 m to x = 5.0 m calculate the work done by this force.

A 1200-kg sports car is advertised to accelerate from 0-100 km/h (27.78 m/s) in 3.00 s. What is the power output of the car in hp? 1 hp = 746 W 01 207 hp 325 hp 200 hp 175 hp

A 10 kg barbell is rolling down a hill. There is no friction or air resistance acting on it, only the force of gravity. If it starts out moving 2 ms1, and ends up moving 7 ms1, then how much work does gravity do on it?

An object is moved on a horizontal surface by a force of 15 N up to a distance of 10 m. The force of kinetic friction is 7.5 N. What is the work done by the resultant force?

Problem 6: Two forces act on an object. F₁ = (10î – 7ĵ) N and F₂ = −15î N. = The object travels from ₁ = +4 m, both on the x axis. -4 m to ₂: = a) What is the work done by F₁? b) What is the work done by F₂? c) What is the net work done? Problem 7: A strap on a suitcase is angled at 25° above horizontal and is used to pull the suitcase a distance of 250 m through an airport. The weight of the suitcase is 50 N. The resistive force of friction on the suitcase is 14 N. The strap applies 20 N of force to the suitcase. a) How much work does gravity do on the suitcase? b) How much work is done on the suitcase by the strap? c) How much work does friction do on the suitcase? d) The suitcase began at rest, how fast is it moving after traveling this distance? Problem 8: A block of mass m = 500 g slides down an incline that has an inclination angle of 30° with the horizontal. The inclined surface has coefficient of kinetic friction µK = 0.4. The block moves 3 m down the incline. a) How much work…

You are out on the road with your friends, when you suddenly run out of gas. You and your friends apply a cumulative force of 103 N to push the car 96 m to the nearest gas station. What is the work done on the car?

A man picks up a 50 kilogram block and carries it up a flight of stairs 10 meters high. He then carries the block back down the stairs and places the block in its original position. What is the NET work done on the block?