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Unit 5, Quiz #1

 

P = W/t
KE = (1/2)*m*v2
PE = m*g*h
W = F*d*cos(theta)

1. A job (such as lifting an object) is done slowly and an identical job is done quickly. Both jobs require the same amount of ____________ but different amounts of ___________.

a. work, energy
b. energy, work
c. work, power
d. power, work

A force is applied to pull a loaded cart along an incline from the floor to the height of a table-top. Four different incline angles are used - 10°, 30°, 45°, and 60°. In each case, the force is applied parallel to the incline.

2. Which angle of incline requires the most applied force?
a. 10°
b. 30°
c. 45°
d. 60°

e. it is the same for each angle

3. Which angle of incline requires the most work or energy?
a. 10°
b. 30°
c. 45°
d. 60°
e. it is the same for each angle

4. It took a rightward force of 350 N to pull a crate weighing 695 N across a level floor to the right. The work done was 4200 J. How far was the crate moved? (Hint: the crate is blue.) PSYW

 

 

 

 

 

5. In the Powerhouse Lab, a 85-kg student climbs up a 1.85-m staircase in 1.82 seconds. Calculate the student's personal power. PSYW

 

 

 

 

6. In the "Its All Uphill" Lab, Amanda B. Reckenwyth applied a 15-N force to a 3-kg cart in order to pull it a distance of 2.0 m along the incline to a final height of 1.0 m. The velocity of the cart was a constant value of 0.60 m/s. Use this information to determine the work which Amanda does upon the cart. See diagram if necessary. PSYW

 

 

 

 

7. A squirrel (mass of 0.65 kg) does push-ups by applying a force to elevate its center-of-mass by 5 cm. Determine the amount of work done if the squirrel does 36 pushups. Please show all your work clearly.

8. The diagram depicts a ball in motion at point A, rolling down and then up a hill. Carefully construct energy-bar charts for this motion at the five indicated positions.

 

Allison Wonderland (50-kg) is swinging in a chair. She starts from rest at a height of 3.2-m above the ground (position A). At position B, she is 1.0 m above the ground. At position C (1.9 m above the ground), she projects from the seat and travels as a projectile along the path shown. At point F, she is a mere picometer above the ground. Assume negligible air resistance throughout the motion. Use this scenario to answer questions #9-13.

9. Carefully construct energy-bar charts for this motion at the five indicated positions (omit E).

 

10. Determine the total mechanical energy of Alice at location A. PSYW

 

 

11. Predict the value of total mechanical energy of Alice at location F.

 

 

12. Determine the Alice's speed at position F. PSYW

 

 

13. Determine the Alice's speed at position B. PSYW

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Last updated on 12/9/04.