A 0.60-kg object is suspended from the ceiling at the end of a 2.0-m string. When pulled to the side and released, it has a speed of 4.0 m/s at the lowest point of its path. What maximum angle does the string make with the vertical as the object swings up?
a. 61°
b. 54°
c. 69°
d. 77°
e. 47°
b
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A proton is moving at 
m/s in a magnetic field of 30 mT. What is the magnetic force on the proton?
A. 
B. 
C. 0.0
D. 
E. More information is needed.
A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground spontaneously moved to the top of a desk. b. an object with low temperature transferred energy in the form of heat to an object with a higher temperature. c. a motion picture was run backwards through the projector. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
The process of matching up rock layers in different localities by such means as index fossils is called
a. conformational analysis. b. correlation. c. indexation. d. cross-cutting.
A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. Which of the sets can only occur if the rigid body rotates through more than 180°?
1.3 rad, 6 rad 2.-1 rad, 1 rad 3.1 rad, 5 rad