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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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).

Physics & Space Science

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?

a. The detector measures the frequency of the beam as less than f. b. The detector measures the frequency of the beam as greater than f. c. The laser emits light at a frequency less than f (as measured at the laser) d. The laser emits light at a frequency greater than f (as measured at the laser) e. Both a and c

Physics & Space Science