Astronomers knew for some time that the rings of Saturn are thin, because they could see stars through the rings.
Answer the following statement true (T) or false (F)
True
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What is the direction of the angular momentum vector for a wheel spinning as shown below?
A. Upward
B. Downward
C. Clockwise
D. Counterclockwise
Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it
A) gradually decreases until the ball reaches the top of its path. B) first acts upward and then downward after reaching the top. C) is only the force due to gravity, always directed downward. D) none of the above
A particle of charge q travels with velocity v in the same direction as the magnetic field, B. What is the force exerted on the charge?
1. qvB, in the direction of the magnetic field 2. qvB, in the direction opposite that of the magnetic field 3. qvB, in a direction perpendicular to the magnetic field and the velocity 4. zero
A concave mirror has a radius of 2.0 m. What is the refractive power of a lens of the same focal length as the mirror?
A. 0.50 D B. 1.0 D C. 2.0 D D. 0.75 D E. -0.50 D