According to Kepler, the orbital period of a planet is directly proportional to the
A) planet's average distance from the Sun.
B) square of the planet's average distance from the Sun.
C) cube of the planet's average distance from the Sun.
Answer: C
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The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?
a. 100% b. most c. few d. none
A shot-putter moves his arm and the 7.0-kg shot through a distance of 1.0 m, giving the shot a velocity of 15 m/s from rest. Find the average force exerted on the shot during this time
a. 197 N c. 600 N b. 394 N d. 790 N
To make an uncharged object have a positive charge:
A) remove some neutrons B) add some neutrons C) add some electrons D) remove some electrons E) heat it to cause a change of phase
For a standing wave on a string the wavelength must equal
a. the distance between adjacent nodes. b. the distance between adjacent antinodes. c. twice the distance between adjacent nodes. d. the distance between supports.