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Work (Grades 11-12)

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Work

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1. 
A force applied to a body is said to do "work"
  1. if the body is displaced in the direction of the applied force.
  2. if the body is displaced in the direction opposite to the applied force.
  3. even if the body does not move.
  4. only when the body is moving.
2. 
A force F acting on an object is given by the expression [math]F(s)=(7s^(3/4)+5)[/math] Newtons, where s is the position of the object in meters. What is the work done by the force F between s = 0m and s = 1m?
  1. 6 Joules
  2. 9 Joules
  3. 10 Joules
  4. 12 Joules
  5. 17 Joules
3. 
How much energy passes through your bedroom lamp (containing a 100 W light-bulb) every evening when you read for half an hour before you going to bed?



4. 
Terrence carries a 275-N, 40" HDTV box up three flights of stairs (a height of 10.0 m) and then pushes it with a horizontal force of 50.0 N at a constant speed of 0.5 m/s for a horizontal distance of 35.0 meters. How much work does Terrence do on his 40" HDTV box during this entire motion?



5. 
A force of 63 N acts on the block at an [math]ang30deg[/math]. The block moves a horizontal distance of 3.0 m. How much work is done by the applied force?



6. 
How much work is done by an applied force to lift a 431N block 7.0 meters vertically at a constant speed?



7. 
Tony, with a mass of 78 kg, runs up three flights of the fire escape in 13.0 sec. He has gone a vertical distance of 9.0 m. Determine the amount of work done by Tony to elevate his body to this height. Assume that his speed is constant.



8. 
A 75kg passenger is inside a 2498kg elevator that rises 98.4 feet in exactly 1 minute. How much work is done by the elevator?



9. 
Two junior Olympians with the same height and arm length, Petrov and Levi, are in the weightlifting room. Petrov dead-lifts 200 lbs. 5 times in one minute; Levi dead-lifts 225 lbs. 3 times in 1 minute. The bar starts at a height of .21m and ends at a height of 0.83m each time. Which Junior Olympian does more work?




10. 
An escalator is used to move 20 passengers every minute from the first floor of a department store to the second. The second floor is located 25 feet above the first floor. The average weight of the passengers is 142.2 lb. Determine the amount of work done by the escalator in order to move this number of passengers.




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