The Roche limit is the:
A) distance from the Sun within which a planet cannot retain or create an atmosphere.
B) minimum distance between a planet and a satellite that can hold itself together by its own gravity.
C) minimum mass required by an object in the Solar System to be classified as a planet instead of a star.
D) distance from Earth at which radio communication with a satellite is lost.
B
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A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m c. 18.7 m b. 16.6 m d. 22.4 m
Gentle gravitational tidal forces appear to be necessary to create spiral arms
a. True b. False Indicate whether the statement is true or false
The farthest planet of our Solar System is ________.
A. Uranus B. Mars C. Jupiter D. Neptune
A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above the horizontal. How much work does gravity do on the box during this process?
A) -1100 J B) -110 J C) -140 J D) -180 J E) 120 J