A 0.60-kg rock is swung in a circular path and in a vertical plane on a 0.25-m length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N
c. 22 N
b. 16 N
d. 6.5 N
B
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A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east b. Zero c. qvB toward the west d. qvB upward e. qvB toward the south
When Marie pushes her desk to the right, friction between the floor and the desk acts toward
A) the left. B) the right. C) at right angles to her push. D) none of the above
A pendulum that on Earth has period 0.52 s is taken to the surface of a large asteroid, where it is measured to have period 1.7 s. What is the value of the gravitational acceleration on the surface of that asteroid?
A. 5.78 
B. 0.48
C. 3.0
D. 0.92