Suppose that the planet Mercury were magically replaced with a baseball. The magnitude of the net force exerted on the baseball would be
A. equal to that exerted on Mercury
B. greater than that exerted on Mercury
C. less than that exerted on Mercury
Answer: A. equal to that exerted on Mercury
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Two sources emit beams of light of wavelength 550 nm. The light from source A has an intensity of 10 µW/m2,
and the light from source B has an intensity of 20 µW/m2. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.) A) Beam B carries twice as many photons per second as beam A. B) A photon in beam B has twice the energy of a photon in beam A. C) The frequency of the light in beam B is twice as great as the frequency of the light in beam A. D) A photon in beam B has the same energy as a photon in beam A. E) None of the above statements are true.
What causes the Coriolis force?
a. The increase in the speed the surface you stand on moves as you increase the radius on a rotating platform. b. The tendency to continue moving in a straight line on a rotating platform. c. The outward force of rotation on a moving platform. d. The force exerted by the platform to keep you moving when stay at the same radius. e. The reaction force that acts on you from the rotating platform.
How do most of the newly discovered solar systems and planets compare to our own?
What will be an ideal response?
Which makes central use of the binary system?
A) phonograph records B) DVDs C) both of these D) neither of these