A uniform meter stick is pivoted to rotate about a horizontal axis through the 25-cm mark on the stick. The stick is released from rest in a horizontal position. The moment of inertia of a uniform rod about an axis perpendicular to the rod and through the center of mass of the rod is given by (1/12)ML2 . Determine the magnitude of the initial angular acceleration of the stick
a. 17 rad/s2
b. 13 rad/s2
c. 15 rad/s2
d. 19 rad/s2
e. 23 rad/s2
A
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How much energy is radiated each second by one square meter of a star whose temperature is 10,000 K? Note: ? in the Stefan-Boltzmann law is equal to 
.
a.
5.67 × 1012 J
b.
5.67 × 108 J
c.
5.67 × 104 J
d.
300 nm
e.
300,000,000 nm
A heat engine absorbs energy of magnitude |QH| as heat from a high temperature reservoir, does work of magnitude |W|, and transfers energy of magnitude |QL| as heat to a low temperature reservoir. Its efficiency is:
A. |QH|/|W| B. |QL|/|W| C. |QH|/|QL| D. |W|/|QH| E. |W|/|QL|
The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about
a. December 21, the winter solstice. c. September 21, the autumnal equinox. b. March 21, the vernal equinox. d. June 21, the summer solstice.
Projectile Motion: A shell is launched with a velocity of 100 m/s at an angle of 30.0° above horizontal from a point on a cliff 50.0 m above a level plain below. How far from the base of the cliff does the shell strike the ground? There is no appreciable air resistance, and g = 9.80 m/s2 at the location of the cliff.
Fill in the blank(s) with the appropriate word(s).