The rotational inertia of an object depends on
A. how its mass is distributed about the spin axis.
B. how fast it is spinning.
C. its color.
D. the amount of torque applied to it.
E. None of these choices are correct
Answer: A
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Phase Angles: A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the resistance in this circuit?
A. 100 ? B. 150 ? C. 120 ? D. 60 ? E. 200 ?
These photos show two different astronomical objects. Which object is bigger, and by about how much?
A) Object 2 is more than a trillion times as large as Object 1. B) Object 2 is approximately 1,000 times as large as Object 1. C) Object 2 is about 10 times as large as Object 1. D) Object 1 is about 10 times as large as Object 2. E) Both objects are about the same size.
A temperature difference of 10 Celsius degrees is also equal to a temperature difference of
10 on the A) Fahrenheit scale. B) Kelvin scale. C) both of these D) neither of these
A 500-turn circular loop 15.0 cm in diameter is initially aligned so that its axis is parallel to the Earth's magnetic field. In 2.77 ms the coil is flipped so that its axis is perpendicular to the Earth's field. If a voltage of 0.166 V is induced in the coil, what is the value of the Earth's magnetic field?