The radius of the earth is R. At what distance above the earth's surface will the acceleration of gravity be 4.9 m/s2?
A) 0.41R
B) 0.50R
C) 1.0R
D) 1.4R
E) 2.0R
Answer: A
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For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air
A. it must be increasing its speed. B. it must exert a force on the air that is directed to the plane's left side. C. it must exert a force on the air that is directed to the plane's right side. D. it does not need to exert a force: it must only move the wing flaps out. E. it only needs to deflect the air without exerting any additional force on the air.
The physical disintegration or fracturing of rock is called
a. mechanical weathering. b. gradation. c. chemical weathering. d. none of these.
When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, he doesn't slip off the skateboard because of
A) inertia in motion. B) momentum change. C) friction between his feet and the board.
The density of a neutron star is comparable to the density of an atomic nucleus
Indicate whether the statement is true or false