When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)
A) The elevator is moving downward at a constant rate.
B) The elevator is accelerating upward at a constant rate.
C) The elevator is accelerating downward at a constant rate.
D) The elevator is moving upward at a constant rate.
E) From the given information, we cannot tell if the elevator is moving up or down.
B, E
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Remanent magnetism in rocks is due to the
presence of a)sodium chloride. b)magnetite. c)calcium deposits. d)zinc-bearing particles.
Luminosity class IV objects are known as ____________________
Fill in the blank(s) with correct word
Three galaxies, each of mass m = 4.0 × 10^41 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 10^22 m length. The magnitude of the force the other two galaxies exert on each galaxy is
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