In Newton's second law, mass and acceleration for constant force are:
a. not related.
b. inversely proportional.
c. directly proportional.
d. additive.
e. two ways of describing the same thing.
b
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Earth's magnetic field
A) prevents charged particles in the solar wind from reaching the surface. B) is a remnant of the solar nebula's magnetic field. C) is weakening the Van Allen radiation belts. D) is the force behind plate tectonics. E) lines intersect the atmosphere at the equator.
If the units of your answer are kg ? m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.)
A) kinetic energy B) force C) power D) work E) potential energy
What does E = mc2 say--that all energy has mass, or that all mass has energy?
A) All mass has energy. B) It says neither of these. C) All energy has mass. D) It says both of these.
Mass on a Spring: An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?
A. 4T B. 2T C. T D. T/2 E. T/4