If y = 0.02 sin (30x ? 400t) (SI units), the wave number is
a. 30 rad/m
b. 30/2? rad/m
c. 400/2? rad/m
d. 400 rad/m
e. 60? rad/m
a
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If two objects are the same size but one object is 3 times hotter than the other object, the hotter object emits
A) 3 times more energy. B) 9 times more energy. C) 12 times more energy. D) 81 times more energy. E) none of the above
A 75-watt lightbulb
A) creates a total of 75 joules of radiant energy during the entire lifetime of the bulb. B) consumes 75 joules of electric energy during every second. C) creates 75 joules of thermal energy during every second. D) consumes a total of 75 joules of electric energy during the entire lifetime of the bulb. E) creates 75 joules of radiant energy during every second.
A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axis. A light cord wrapped around the wheel supports a 0.50-kg object, as shown in the figure. When released from rest the object falls with a downward acceleration of 5.0 m/s2. What is the rotational inertia of the wheel?
?
?
a.
0.023 kg?m2
b.
0.027 kg?m2
c.
0.016 kg?m2
d.
0.019 kg?m2
e.
0.032 kg?m2
A Carnot heat engine operates between 400 K and 500 K. Its efficiency is:
A. 20% B. 25% C. 44% D. 79% E. 100%