At what location does an artificial Earth satellite in elliptical orbit have its greatest speed?
a. nearest the Earth
b. farthest from the Earth
c. between Earth and Moon
d. between Earth and Sun
a
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Vision Problems: The near point of a farsighted person is 100 cm. She places reading glasses very close to her eyes, and with them she can comfortably read a book at a distance of 25 cm. What is the power of the lenses in her reading glasses?
A. +2.5 diopters B. +3.0 diopters C. +3.2 diopters D. -2.0 diopters
A 1200-kg cannon suddenly fires 100kg cannonball at 35m/sWhat is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally
A) 35 m/s B) 3.5 m/s C) 3.2 m/s D) 2.9 m/s
How have astronomers determined the mass of the Milky Way's supermassive black hole?
What will be an ideal response?
Paleomagnetism from a rock gives information on the
A) direction from the rock to the North Pole. B) present-day magnetic field. C) amount of iron in the rock. D) magnetic field at the time the rock was formed.