A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that
A)
a frictional force is acting on it.
B)
a net downward force is acting on it.
C)
a net upward force is acting on it.
D)
it is not acted on by appreciable normal force.
E)
it is not acted on by appreciable gravitational force.
A
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In quantum theory, a "wave packet"
A) represents many particles, each one having both a specific position and a specific velocity. B) represents one particle having a range of possible positions but a specific velocity. C) represents one particle having a range of possible positions and a range of possible velocities. D) represents many particles, each one having a range of possible positions and a range of possible velocities. E) represents one particle having a specific position but a range of possible velocities.
Lise Meitner was
A) one of the discoverers of radioactivity. B) a leader in developing the world's first nuclear reactor. C) discoverer of the ozone hole over the southern polar region. D) one of the discoverers of nuclear fission. E) one of the discoverers of nuclear fusion.
Baryons are composed of _______ quarks, and mesons are composed of ________ quarks
a. two, two c. three, three b. two, three d. three, two
A constant force is applied to a body that is already moving. The force is directed at an angle of 60 degrees to the direction of the body's velocity. What is most likely to happen is that
a. the body will stop moving. b. the body will move in the direction of the force. c. the body's velocity will increase in magnitude but not change direction. d. the body will gradually change direction more and more toward that of the force while speeding up. e. the body will first stop moving and then move in the direction of the force.