Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. The maximum height of Joe's ball will be
A) four times that of Bill's ball.
B) two times that of Bill's ball.
C) equal to that of Bill's ball.
D) eight times that of Bill's ball.
E) roughly 1.3 times that of Bill's ball.
A
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Gravity obeys an inverse square relation. This statement implies that the force due to gravity between two masses
a. will increase as the distance between the two masses increases. b. will decrease as the square of the distance between the two masses increases. c. will cause the two masses to move away from each other. d. will cause the two masses to move in a straight line. e. will cause the two masses to orbit each other.
What fraction of the solar system's mass is in the Sun?
a) About 50% b) About 99% c) About 10% d) Less than 1% e) About 75%
A photocathode whose work function is 2.5 eV is illuminated with white light that has a continuous wavelength band from 360 nm to 700 nm. The stopping potential for this white light illumination is closest to:
A) 0.94 V B) 0.85 V C) 1.0 V D) 1.1 V E) 1.2 V
Deuterium and lithium-7 are part of the 4.5% normal matter
a. True b. False Indicate whether the statement is true or false