As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous
a. True
b. False
Indicate whether the statement is true or false
False
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For a bullet fired horizontally, its ________ velocity will retain a constant non-zero value until it is stopped.
Fill in the blank(s) with the appropriate word(s).
A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
A) 4a B) a/2 C) a/4 D) 2a E) a
A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air
(a) How high is the bridge from the water below? (b) How far horizontally does the rock travel before striking the water?
What do retro reflectors do?
a. Serve as a substitute for tail lights on cars. b. Cause light to pass through a mirror instead of reflecting it back. c. Cause light to reflect back in a straight line parallel to the direction it hits the mirror. d. Change the color at which light reflects back from a mirror by using filters. e. Cause the light to reflect at a right angle to the direction it hits the mirror.