Two forces are applied to a doorknob, perpendicular to the door. The first force is twice as large as the second force. The ratio of the torque of the first to the torque of the second is
A) 1/4.
B) 1/2.
C) 2.
D) 4.
E) 8.
C
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Tides caused mainly by the Moon occur in Earth's
A) oceans. B) atmosphere. C) interior. D) all of the above
An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope
A) remains neutral. B) is negatively charged. C) is positively charged. D) could be either positively or negatively charged, depending on how long the contact with ground lasted.
A wheel is rotated about a horizontal axle at a constant angular rate. Next, it is rotated in the opposite direction with the same angular rate. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:
a. is in the same direction. c. is upward. b. is in the opposite direction. d. is tangential to the wheel.
A circular current loop is placed in an external magnetic field. How is the torque related to the radius of the loop?
a. directly proportional to radius squared b. directly proportional to radius c. inversely proportional to radius squared d. inversely proportional to radius