The drive chain in a bicycle is exerting a torque of 0.850 N ? m to the wheel of the bicycle. You can treat the wheel as a thin uniform hoop (or ring) with a mass of 0.750 kg and a radius of 33.0 cm. What is the angular acceleration of the wheel?
A) 10.4 rad/s2
B) 20.8 rad/s2
C) 5.20 rad/s2
D) 3.43 rad/s2
E) 1.06 rad/s2
A
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When the voltage across a resistor is decreased by 50%, what happens to the power dissipated?
A. it increases by 50% B. it decreases by 50% C. it decreases by 25% D. it decreases by 71% E. it decreases by 75%
The wind instrument with no keys or valves is a
A) trumpet. B) saxophone. C) clarinet. D) bugle.
Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy
A) 1.0 × 106 B) 1.4 × 108 C) 6.2 × 109 D) 3.9 × 103
A schematic of a simple laser is shown here. Which of the following are characteristics of light produced by a laser?
a. Very narrow range of wavelengths. b. Highly directional beam. c. Very intense beam. d. Light that is coherent. e. All of the above.