Slanting Surfaces With Friction: A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about normal force F on the block due to the ramp?
A. F > mg
B. F > mg cos ?
C. F > mg sin ?
D. F = mg cos ?
E. F = mg sin ?
Answer: D
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A metal cylinder of radius 2.0 mm is concentric with another metal cylinder of radius 5.0 mm. If the space between the cylinders is filled with air and the length of the cylinders is 50 cm,
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a. 7/6 W up b. 4/3 W down c. 7/6 W down d. 4/3 W Up
The seasons are caused by Earth's orbit moving closer to or farther from the Sun
a. True b. False Indicate whether the statement is true or false