As a normal object’s thermal energy U goes to zero, the slope of a graph of its entropy S versus U
A. approaches infinity.
B. approaches some positive value less than infinity.
C. approaches zero.
D. approaches some finite negative value.
E. approaches negative infinity.
F. depends entirely on the object’s properties.
A. approaches infinity.
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A thin rod of mass M and length L is struck at one end by a ball of clay of mass m, moving with speed v as shown in the figure. The ball sticks to the rod. After the collision, the angular momentum of the clay-rod system about A, the midpoint of the rod, is
A. (m + M/3)(vL/2) B. (m + M/12)(vL/2) C. (m + M/6)(vL/2) D. mvL/2 E. mvL
Rotational Kinetic Energy: A small ball is tied to one end of a light 2.5-m wire, and the other end of the wire is hooked to the ceiling. A person pulls the ball to the side until the wire makes an angle of 35° with the plane of the ceiling and then gently releases it. What is the angular speed of the ball, in rad/s, as it swings through its lowest point?
Fill in the blank(s) with the appropriate word(s).
An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will
A) continue to move to the right, with its speed increasing with time. B) continue to move to the right, with its speed decreasing with time. C) continue to move to the right with a constant speed. D) stop and then begin moving to the left.
Determine the rms voltage drop across the resistor in the circuit
a.
55 V
b.
77 V
c.
9.9 V
d.
5.5 V
e.
61 V