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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 5 | A horizontal force of 100 N is applied to move a 45-kg cart across a 9.0-m level surface. What work is done by the 100-N force? | 900J | |
| 5 | A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface. If the cart accelerates at 2.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart? | -900J | |
| 5 | A jet engine develops 1.0 ´ 105 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine? | 25 MW | |
| 5 | A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 000 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump? | 489000J | |
| 5 | A pile driver drives a post into the ground. The mass of the pile driver is 2 500 kg and it is dropped through a height of 8.0 m on each stroke. If the resisting force of the ground is 4.0 ´ 106 N, how far is the post driven in on each stroke? | 4.9cm | |
| 5 | A pole vaulter clears 6.00 m. With what speed does he strike the mat in the landing area? | 10.8m | |
| 5 | A professional skier reaches a speed of 56 m/s on a 30° ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest? | 320m | |
| 5 | A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise? | 11.5 m | |
| 5 | A satellite is held in orbit by a 2 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is: | 0 | |
| 5 | A simple pendulum, 1.00 m in length, is released from rest when the support string is at an angle of 35.0° from the vertical. What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance) | 1.88 m/s | |
| 5 | A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, to what maximum angle will it move in the second half of its swing? | 30° | |
| 5 | A simple pendulum, 2.0 m in length, is released with a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2) | 2.3m/s | |
| 5 | A speed boat requires 80 kW to move at a constant speed of 15 m/s. What is the resistive force of the water at this speed? | 5300N | |
| 5 | A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface. What is the net work done in the process? | zero | |
| 5 | A worker pushes a wheelbarrow with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? | 96J |
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