A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N
B) 400 N
C) 800 N
D) 2560 N
E) 3920 N
D
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Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A) the mass of the sphere. B) the radius of the sphere. C) both the mass and the radius of the sphere. D) neither the mass nor the radius of the sphere.
Characteristics of Waves: Which one of the curves shown in the figure best represents the variation of wave speed v as a function of tension for transverse waves on a stretched string?
A. A B. B C. C D. D E. E
Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. 
At what value of t is the speed of the particle equal to 0 m/s?
A. 0 s B. 1 s C. 2 s D. 3 s E. 4 s
When an ideal gas is compressed isothermally:
A. the internal energy of the gas does not change. B. the work done on the gas is zero. C. heat flows into the gas. D. the temperature of the gas increases.