1. How much work is required to lift a 2-kilogram mass to a height of 10 meters? a) 5 joules b) 20 joules c) 100 joules d) 200 joules 2. A garden tractor drags a plow with a force of 500 newtons a distance of 10 meters in 20 seconds. How much work is done? a) 25 joules b) 1,000 joules c) 2,500 joules d) 5,000 joules 3. How much work is done on a 300-newton suitcase to lift it 0.50 meter? a) 600 joules b) 300 joules c) 150 joules19. A cart of mass m traveling at speed v has kinetic energy KE. If the mass of the cart is doubled and its speed is halved, the kinetic energy of the cart will be a) half as great b) twice as great c) one-fourth as great d) four times as great 20. The diagram shows a 1.5-kilogram kitten jumping from the top of a 1.80-meter-high refrigerator to a (1.90-meter-high counter. Compared to the kitten's gravitational potential energy on top of the refrigerator, the kitten's gravitational potential energy on top of the counter is a) half as great b) twice as great c) one-fourth as great d) four times as great Problems: Show all required work. Marks as indicated. Place answer in the blank provided. You must use Work, Power, and Energy equations and methods or th question will be marked wrong according to the marking rubric. 1. The drawing below shows a boat being pulled by two locomotives through a 2.00 km /16 canal. The tension in each cable is 5.00 x 10 N and @ = 20. What is the work done on the boat by both locomotives? The speed of a hockey puck (mass = 100.0 g) decreases from 45.00 m/s to 42.68 m/s in coasting 16.00 m across the ice. a. How much thermal energy (work) was produced? /12 2a. b. What frictional force was acting on the puck? /10 2b. A machine operates at a power consumption of 3.5 x10 W for 10.0 minutes. In the process it produces 5.00 x 10 J of waste heat energy. How much net work was done? /16 3. A 45.0 kg box initially at rest slides from the top of a 12.5 m long incline. The incline is 5.0 m high at the top. If the box reaches the bottom of the incline at a speed of 5.0 m/s, what is the force of friction on the box along the incline? /18 4. A person does 100 joules of work in pulling back the string of a bow. What will be the initial speed of a 0.5-kilogram arrow when it is fired from the bow? a) 20m/s b) 50m,/s ) 200m/s d) 400m/s A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. Approximately how much work does the student do against friction in moving the box 5.5 meters across the floor? a) 45J b) 180.J c) 2507 d) 740J 8. What is the maximum distance that a 60-watt motor may vertically lift a 90-newton weight in 7.5 seconds? a) 2.3m b) 5.0m c) 140m d) 1100m 9. A 6.0 x 10--newton man climbing a rope at a speed of 2.0 meters per second develops power at the rate of a) 1.2 x 10' W b) 6.0 x 102 W c) 3.0 x 102 W d) 1.2 x 103 W