1. Find the work done in pushing a car a distance of 14 m while exerting a constant force of 800 N. Select the correct answer.
W = 10,700 J
W = 11,200 J
W = 11,500 J
W = 12,700 J 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. A spring has a natural length of 19 cm
A spring has a natural length of 19 cm. If a force of 39 N is required to keep it stretched to a length of 29 cm, how much work is required to stretch it from 19 cm to 40 cm? Select the correct answer. J J J J J 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. A cable that weighs 16 lb/ft is used to lift 560 lb of coal up a mine shaft 500 ft deep. True or False: The work required is 2,280,000 ft-lb.
True
False 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

4. In a steam engine the pressure and volume of steam satisfy the equation {image} , where k is a constant. (This is true for adiabatic expansion, that is, expansion in which there is no heat transfer between the cylinder and its surroundings.) Calculate the work done by the engine during a cycle when the steam starts at a pressure of {image} and a volume of {image} and expands to a volume of {image} . Use the fact that the work done by the gas when the volume expands from volume {image} to volume {image} is {image}
5,056 ft-lb
5,005 ft-lb
5,055 ft-lb
5,165 ft-lb
4,056 ft-lb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50