(a) How much work is done?
(b) How much power is exerted by the car?
2. A student lifts a bucket with a 98 N force in 30 seconds out of a well. If the bucket is lifted 30 m then;
(a) How much work is done?
(b) How much power is exerted by the student?
3. A car 2400 kg is traveling down the road at 26.1 m/s. If the car accelerates up to 35 m/s over a distance of 200 m then
(a) How much work is done?
(b) How much power is exerted by the car?
4. After accelerating the car mentioned in problem #3 now locks the brakes and skids to a stop in 350m.
(a) How much work is done?
(b) How much power is exerted by the car’s brakes?
5. A 1400 kg car travels up a 20 degree incline. The car exerts a constant force of 30,000N across 100 m.
(a) How much work is done?
(b) How much power is exerted by the car?
6. A 0.050 kg arrow is accelerated from rest by a bow to a velocity of 140 m/s in 0.60 m.
(a) How much work is done?
(b) How much power is exerted by the bow?
7. A 50.0 kg box is pushed by a 400 N force that acts at a 30° angle with the ground. The box starts from rest. The box is attatched to acart with wheels that exert no frictional forces on the floor. The box is pushed for 20 m. How much power is exerted when the box is moved?
8. A roller coaster, 456 kg, car is pulled up the first hill of a ride. The car starts from rest and is lifted 93 m from its lowest height. A motor pulls the car up the incline which is 150 m long by exerting a 3333 N force parallel to the incline. The car is pulled up in 101 seconds. How much power is exerted by the motor?
9. A 1000 kg roller coaster car enters a lift hill at 3.55 m/s. The hill lifts the car up 30 meters in 45 seconds. The car reaches the top of the lift hill at 4.11 m/s. How much power is exerted by the lifting motor?
10. A 653 kg roller coaster car enters the loading station at the end of its run at 20 m/s. The car slows down to 3 m/s in 25 meters on a level piece of track. How much power is exerted by the brakes to stop the car?
