Which best describes the proper time interval between two events?
A. the longest interval measured by any inertial observer
B. the interval measured in the reference frame in which the two events occur a maximum distance from each other
C. the interval measured in a reference frame in which the two events are simultaneous
D. the interval measured in a reference frame in which the two events occur at the same place
E. None of these choices are correct
D. the interval measured in a reference frame in which the two events occur at the same place
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For a monatomic gas, 3R/2 is
a. the specific heat per mole at constant volume. b. the specific heat per unit mass at constant volume. c. NAkB. d. none of the above.
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A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force exerted on this object is 30 N to the left. What is the acceleration of the object?
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