A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
a. the change in momentum is greater.
c. the time interval for stopping is greater.
b. the change in momentum is less.
d. the time interval for stopping is less.
C
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Satellite Motion: The reason an astronaut in an earth satellite feels weightless is that
A. the astronaut is beyond the range of the earth's gravity. B. the astronaut is falling. C. the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. D. this is a psychological effect associated with rapid motion. E. the astronaut's acceleration is zero.
Resistance and Resistivity: A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. How much current is flowing in the tube, if the radius of the tube is 0.495 mm?
A. 18 A B. 180 A C. 29 A D. 280 A
A person is nearsighted with a far point of 75.0 cm
(a) What focal length contact lens is needed to give him normal vision? (b) What is the power of the corrective lens?
During the Pleistocene ice age
A) there was one large episode of glacial advance. B) there were several episodes of glacial advance and retreat. C) Earth's entire surface was covered with ice. D) Earth's oceans were completely frozen.