A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down.
b. rotating counterclockwise and slowing down.
c. rotating clockwise and speeding up.
d. rotating counterclockwise and speeding up.
e. first rotating counterclockwise and then clockwise.
c
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On a force vs. position graph, the area under curve is a representation of
A) force. B) position. C) kinetic energy. D) potential energy. E) work.
Since accelerations are equivalent to gravity, a person could cancel the effects of Earth's gravity by
A) falling from a high place. B) going into orbit around Earth. C) Both of the above. D) accelerating straight upward at an acceleration of 1g. E) Nonsense--you can't cancel the effects of gravity.
Light is incident on a double-slit. The fourth bright band has an angular distance of 7.0° from the central maximum. What is the distance between the slits (in mm)? (Assume the frequency of the light is 5.4 × 10^14 Hz.)
a. 27 b. 21 c. 24 d. 18 e. 14
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the orbital velocities of galaxies in the cluster B) measuring the temperature of x-ray gas in the intracluster medium C) measuring the amount of distortion caused by gravitational lensing