Unit 5 Quiz#2
Use the diagram at the right to answer questions #1 and #2.
1. As the pendulum bob swings from position A to position B, its total mechanical energy (neglecting friction)
2. As the pendulum bob swings from position A to position B, its
3. As a rock falls from a cliff, its total mechanical energy is equal to
4. Jennifer exerts a 200 N force to lift a barbell to a vertical height of 2.0 m in 5.0 s. If she had done this in 10 s, the work done would have been
5. The kilowatt x hour is a unit of
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 0.50 m/s. Use this information to determine the work which Amanda does upon the cart. See diagram if necessary. PSYW
Determine the rate at which work is done (i.e., power) upon the cart. PSYW
7. For each set of units below, identify whether they are units of force, work (or energy), or power. Record your answers in the blanks below.
Li Ping Phar, the esteemed Chinese ski jumper, starts at rest on top of a 100-meter hill, skis down the 45° incline and makes a world-record setting jump. The heights at various locations along her path are shown below. Use the diagram to answer questions #8-#12.
8. Li Ping Phar has a mass of 50 kg. Fill in the blanks to indicate Li Ping Phar's potential and kinetic energy at position A, C, D, and E (the instant before striking the ground). Neglect friction, air resistance, and the effect of ski poles.
9. Determine Li Ping Phar's speed at position D. PSYW
10. Determine Li Ping Phar's speed at position E (just prior to hitting the ground). PSYW
11. Using a complete sentence, compare the speed of Li Ping Phar at positions B and D, supporting your answer with sound physical reasoning.
12 The Swiss ski jumper, Eaton Alottafude, has a mass of 80 kg. Would Eaton's greater mass create an advantage, disadvantage, or make no difference to his success? Explain clearly.
For 5 points, pick one of the following two problems and solve. To earn 3 extra credit points, obtain perfect solutions to both of them. Please show your work to receive credit.
13. A Hot Wheels car traveling with a speed of 4.0 m/s is coasting towards an incline (see diagram). Detemine the height to which the car will rise on the opposite incline. Assume no friction. PSYW
14. A 0.50-N force is applied at an angle of 60° to the horizontal in order to accelerate a 10-kg sled from rest across an icy pond (frictionless) for a distance of 20 meters. Determine the final velocity of the box. PSYW
© Tom Henderson, 1996-1998
Last updated on