Ancient people who knew the saros cycle could
A) completely predict the details of all eclipses.
B) completely predict the details of solar eclipses, but not lunar eclipses.
C) completely predict the details of lunar eclipses, but not solar eclipses.
D) predict the date and time of the next total solar eclipse that would be visible at their location.
E) predict when lunar and solar eclipses would occur, but not necessarily whether the eclipse would be partial or total, or exactly where it would be visible.
E) predict when lunar and solar eclipses would occur, but not necessarily whether the eclipse would be partial or total, or exactly where it would be visible.
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An auto travels down a straight, level road at constant speed. One force that acts on the auto is
A) the road pushing upward on the auto. B) the auto pushing downward on the road. C) gravity pushing upward on the auto. D) the road pulling downward on the auto. E) None of the above.
A diffraction grating with 10,000 lines/cm will exhibit the first order (m = 1) maximum for light of wavelength 264 nm at what angle? (1 nm = 10-9 m)
a. 15.3° c. 0.51° b. 0.62° d. 31°
What is the special property of a semipermeable membrane that makes osmosis possible?
A) The pores in the membrane only allow water to pass through. B) Water only moves through the membrane in one direction. C) Only the ions travel through the membrane. D) Ions only move one way through the membrane. E) none of the above
A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward
The wood is then pulled an additional distance of 1.0 cm down and released from rest. (a) How long does it take the wood to make 3 complete cycles of vibration? (b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?