Which Saturnian moon has the leading hemisphere black as tar, the back side icy white?
A) Rhea
B) Titan
C) Enceladus
D) Iapetus
E) Mimas
D
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What is the correct method to subtract a vector from another vector?
a. Put one on top of the other, put a minus sign by the lower one, and then subtract as if they were numbers. b. Draw an arrow from the head of the first vector to the tail of the second. c. Add the two vectors and make the result negative. d. Turn the arrow you are subtracting around, and then add. e. Draw an arrow from the tail of the first vector to the head of the second.
A baseball player slides into third base. Why, according to the modern model of mechanics, does the player eventually come to rest?
A. All moving objects naturally come to rest eventually. B. Friction overpowers the force of the player’s motion. C. The force of the player’s motion eventually wears out. D. A friction interaction changes the player’s motion. E. Other (specify).
A horizontal disk rotates about a vertical axis through its center. Point P is midway between the center and the rim of the disk, and point Q is on the rim
If the disk turns with constant angular velocity, which of the following statements about it are true? (There may be more than one correct choice.) A) P and Q have the same linear acceleration. B) Q is moving twice as fast as P. C) The linear acceleration of Q is twice as great as the linear acceleration of P. D) The linear acceleration of P is twice as great as the linear acceleration of Q. E) The angular velocity of Q is twice as great as the angular velocity of P.
If the half-value layer for a particular energy gamma ray is 0.40 cm of lead. What fraction of a beam of these photons will penetrate 1.00 cm of lead?
A. 0.40 B. 0.18 C. 0.067 D. 0.60 E. 0.72