A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II
b. I, II, and III
c. I, II, III and IV
d. I, II, III, IV and V
e. I, II and IV.
b
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Work: Find the net work done by friction on a box that moves in a complete circle of radius 1.82 m on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65.0 N.
A. 190 J B. 0 J C. 1800 J D. 370 J
A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W. At what rate is the internal (thermal) energy of the gas changing?
A) 56.1 W B) 318 W C) -56.1 W D) 187 W
Astronomers have measured the Milky Way's mass by
A. observing its gravitational attraction on matter in and near it. B. using radar. C. sending unmanned space missions to the center of the Galaxy. D. observing magnetic fields in the Solar System.
A charge is placed on a spherical conductor of radius r1. This sphere is then connected to a distant sphere of radius r2 (not equal to r1) by a conducting wire. After the charges on the spheres are in equilibrium,
A.
B.
C.
D.
.E.
.