A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the frequency of the rotational motion is
A. 4.00 Hz.
B. 3.67 Hz.
C. 3.18 Hz.
D. 2.83 Hz.
E. 2.15 Hz.
C. 3.18 Hz.
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A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. If there is no air resistance, what is the speed of the ball when it returns to the same horizontal level?
A) 4.0 m/s B) 8.0 m/s C) 16 m/s D) 9.8 m/s
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum ? of the heat pump
a. 0.2 b. 4.4 c. 0.5 d. 7.6 e. 6.7
Which one of the following is the correct expression for the Heisenberg uncertainty principle?
A) ?py ?y ? h/2? B) ? py ?y ? h/2? C) ? py /?y ? h/2? D) ?y/? py ? h/2? E) None of the other answers is correct.
The chief erosive agent now on the Moon is
A) lunar ice melting and refreezing in the polar regions. B) lava flows welling up in the mare. C) volcanic vents in the rugged highlands. D) the rain of micrometeorites chewing up the regolith. E) rain from cometary debris melting as it enters the Moon's atmosphere.