A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it from the floor?
A) 110 cm
B) 11 cm
C) 110 mm
D) 140 cm
Answer: A
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A 13.7-?F capacitor is connected to an AC source with an rms voltage of 148 V and a frequency of 40.0 Hz. What is the rms current in the capacitor?
a. 0.162 A b. 0.255 A c. 0.509 A d. 0.360 A e. 0.720 A
Which of the following astronomical objects emit radiation mostly at non-visible wavelengths?
A. cold interstellar gas clouds B. dust clouds in space C. hot gas surrounding black holes D. All of these choices are correct.
A 3.0-? resistor is connected in parallel with a 6.0-? resistor. This combination is then connected in series with a 4.0-? resistor
The resistors are connected across an ideal 12-volt battery. How much power is dissipated in the 3.0-? resistor? A) 6.0 W B) 2.7 W C) 5.3 W D) 12 W
Doppler Effect: You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz. You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s.
A. 1300 Hz B. 1320 Hz C. 1270 Hz D. 1360 Hz E. 1370 Hz