Velma zooms past Mort at half of lightspeed. Velma observes Mort's clock to run
A) slow. B) on time.
C) fast. D) None of the above.
A
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How are rotation curves of spiral galaxies determined for orbital distances beyond where starlight can be detected?
A) by extrapolation of the measured rotation curve B) by observations of the 21 cm line of atomic hydrogen C) by observations of spectral lines emitted by dark matter D) by watching the galaxies rotate over a period of decades E) by measuring the broadening of the galaxy's absorption lines
A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, what happens to the water level in the tub?
A) It goes up. B) It goes down. C) It does not change. D) cannot be determined from the information given
A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then filled with a diamagnetic material. What changes will this make to the magnetic field along the axis of the solenoid?
A) The field will point in the -x direction with a smaller magnitude. B) The magnetic field will not change. C) The field will point in the same direction with a larger magnitude. D) The field will have the same magnitude but will now point in the -x direction. E) The field will point in the same direction with a smaller magnitude.
Pen Pineapple Apple Pen
A) C6H12 B) C5H5 C) C6H10 D) C5H10 E) none of the above