A crate travels through a factory on a conveyor belt that is inclined at some non-zero angle above the horizontal at a constant speed. If air resistance is negligible, what forces are active on the box?
A. Normal force, weight, static friction, kinetic friction.
B. Normal force, weight, static friction
C. Normal force, weight, static friction, force of the conveyor belt
D. Normal force and weight
B. Normal force, weight, static friction
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An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?
A) It is in the negative x direction. B) It is in the positive x direction. C) It is in the positive y direction. D) It is in the negative z direction. E) It is in the positive z direction.
On the Kelvin temperature scale, a body's temperature is directly related to its ________.
A. kinetic energy due to its motion through space B. mass C. internal energy content D. kinetic energy due to rotation E. None of these choices are correct.
A uniform solid sphere rolls down an incline of height 3 m after starting from rest. In order to calculate its speed at the bottom of the incline, one needs to know:
a. the mass of the sphere. b. the radius of the sphere. c. the mass and the radius of the sphere. d. no more than is given in the problem.
How will high tides differ from their average values when the Moon is in its full phase?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is full.