Considering that the Sun is about 1/100 AU in diameter and a typical planet like Earth is 1/10,000 AU, discuss whether or not our Solar System is crowded or empty
What will be an ideal response?
The Sun and planets make up only a tiny fraction of the volume of the Solar System, so it is relatively empty.
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Simple Pendulum: On the Moon, the acceleration of gravity is g/6. If a pendulum has a period T on Earth, what will its period be on the Moon?
A. T
B. T/
C. T/6
D. 6T
E. T/3
Compared to a cold molecular cloud at 10 K, an HII region has a temperature about
A. 1,000 times hotter. B. 10 times hotter. C. 1,000,000 times hotter. D. the same.
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror:
a. depends on both the height of the man and the distance from the man to the mirror. b. is equal to the height of the man. c. is equal to one-half the height of the man. d. depends on the distance the man stands from the mirror.