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Unformatted text preview: l. The skier’s speed upon landing at the critical point was
85 km/h. What was the change in this skier’s kinetic energy on her flight from the
table point to the critical point?
D. 11. –8.4 × 101 J
–3.0 × 102 J
– 4.2 × 103 J
–5.4 × 104 J The reduction in flight speed as a skier moves through the air is mainly due to the
aerodynamic lift generated on the skier in “sailing position.” The work done by
this force acts to reduce the
D. kinetic energy of the skier
potential energy of the skier
time spent in the air by the skier
horizontal distance travelled by the skier 7 Use the following information to answer the next four questions.
To determine the electric force on a 2.5 × 10– 4 kg neutral pith ball, a student
charges a Van de Graaff generator and suspends the pith ball by an insulating
Van de Graaff
generator 12. When the neutral pith ball is placed near the charged Van de Graaff generator, the
pithball is attracted to the generator as a result of
D. 13. induction
induction and grounding The direction of the electrical force on the pith ball is
↓ 8 14. The magnitude of the electrical force exerted on the pith ball by the charged
Van de Graaff generator is
A. 2.5 × 10–3 N B.
D. 2.3 × 10–3 N
8.9 × 10– 4 N
8.4 × 10– 4 N
Use the following additional information to answer the next question.
A student placed a piece of rabbit fur on the top of the sphere of the
Van de Graaff generator. The generator was then turned on and the rabbit fur
was repelled and formed an arc directly above the generator. When the
generator was turned off, the fur remained in the same position.
Using a camera with a flash, a second student then took a picture of the
apparatus. Immediately after the flash, the fur collapsed somewhat. 15. The concept that explains the collapse of the rabbit fur is
A. induction B.
the photoelectric effect 9 Use the following information to answer the next four questions.
Brent rewired his brake light circuit so that every time he applies the brakes,
an indicator light on the dashboard goes on. The circuit that Brent used is
Brake switch Bulb 2
12.0 Ω Bulb 1
light Bulb 3
12.0 Ω Brake lights
A 12.0 V 16. Brent should not have wired the circuit as illustrated because both brake lights will
fail to light if
A. bulb 1 fails B.
D. bulb 2 fails
bulb 3 fails
the brakes are applied 10 Use the following additional information to answer the next three questions.
In Brent’s circuit, all bulbs are working and the brake switch is closed. Numerical Response
4. The reading on the ammeter is __________A.
(Record your three-digit answer in the numerical-response section on the answer sheet.) Numerical Response
5. The voltage drop across one of the 12.0 Ω light bulbs is __________ V.
(Record your three-digit answer in the numerical-response section on the answer sheet.) 17. The electrical power dissipated by the 4.00 Ω bulb is...
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- Fall '09