How do comets differ from asteroids?
a. They are mostly rock, not ices.
b. Their orbits are usually much farther from the Sun.
c. They are leftover pieces of a smashed planet.
d. All of the above.
Ans: b. Their orbits are usually much farther from the Sun.
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The diagram below shows five cylinders, each cylinder rotating with constant angular velocity about its central axis. The magnitude of the tangential speed of one point of each cylinder is shown, along with each cylinder's radius and mass. Which cylinder has the largest angular momentum?
A.
B.
C.
D.
E.
You fall, while skiing, and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle ? with the horizontal. The force that pushes it down along the hill is
A) W. B) W cos ?. C) zero; it moves with constant velocity. D) W sin ?. E) W tan ?.
In which of the following cases would the maximum "contact pressure" from the floor on a person be the least?
1.when the person is lying down on the floor 2.when the person is sitting on the floor 3.when the person is standing on the floor 4.when the person is standing on their tip-toes on the floor
Snell's Law: Light enters glass from air. The angle of refraction will be
A. greater than the angle of incidence. B. equal to the angle of incidence. C. less than the angle of incidence.