A constant force is acting on an object. Which of these graphs best represents the velocity of the object?
A. 
B. 
C. 
B. If the force is constant, the acceleration is
constant (F = ma). If the acceleration is constant, then the slope of the velocity versus time graph is constant. Thus graph B is the correct choice.
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A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct?
A) The truck experiences the greater average force. B) The small car experiences the greater average force. C) The small car and the truck experience the same average force. D) It is impossible to tell since the masses are not given. E) It is impossible to tell since the velocities are not given.
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating. b. the body is rotating at constant angular velocity but has no linear velocity. c. the body has neither linear nor angular velocity. d. the body may have constant linear or angular velocity, but not both simultaneously. e. the body may have constant linear or constant angular velocity, or both simultaneously.
Doubling the potential difference across a length of copper wire causes what change to the drift speed of the charge carriers?
1.No change occurs since drift speed is constant for copper. 2.The drift speed halves. 3.The drift speed doubles. 4.The drift speed quadruples.
Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies
a. True b. False Indicate whether the statement is true or false