Which of the following statements is true of the rings of Saturn?
A) Unlike A and B rings, C rings are dust-size ice crystals.
B) C ring particles contain more minerals and less ice.
C) C ring particles are less than half as bright as particles in the A and B rings.
D) All the ring particles that are at the same distance from the planet orbit at different speeds.
C
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A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2. B. 9.0 m/s; 9.8 m/s2. C. 9.0 m/s; 9.0 m/s2. D. 1.0 m/s; 9.0 m/s2. E. 1.0 m/s; 9.8 m/s2.
Which event in the history of the universe happened last?
A) Stable helium nuclei formed. B) The electroweak force separated into electromagnetic and weak nuclear forces. C) The GUT force separated into the electroweak force and strong force. D) Neutral atoms formed.
A lightbulb cannot absorb charge
Indicate whether the statement is true or false
A wheel (radius = 0.20 m) starts from rest and rotates with a constant angular acceleration of 2.0 rad/s2 . At the instant when the angular velocity is equal to 1.2 rad/s, what is the magnitude of the total linear acceleration of a point on the rim of the wheel?
a. 0.40 m/s2 b. 0.29 m/s2 c. 0.69 m/s2 d. 0.49 m/s2 e. 0.35 m/s2