A ball gains speed while rolling down a hill due mainly to
A) its rotational inertia.
B) its angular acceleration.
C) a balanced torque.
D) an unbalanced torque.
Answer: D
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Doppler Effect: A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s.
A. 68 Hz B. 69 Hz C. 70 Hz D. 71 Hz E. 72 Hz
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The frequency of the electromagnetic oscillations in the circuit is
A. 5.73 × 10?4 Hz. B. 9.55 × 10?3 Hz. C. 0.442 Hz. D. 2.65 Hz. E. 44.0 Hz.
A typical atom has a size of about
A) 1 nanometer (10-9 meters). B) 1 millimeter (10-3 meters). C) 1 picometer (10-12 meters). D) 1 Angstrom (10-10 meters).
A highly reliable laser emits a steady beam of light at a fixed frequency f that hits a photodetector a light year away in what we can assume is empty space. The laser/detector setup is now placed as a system with a black hole directly behind the laser. What happens to the frequency of the light beam?