A certain planet has an escape speed V. If another planet of the same size has twice the mass as the first planet, its escape speed will be
A) 2V.
B) V.
C) V.
D) V/2.
E) V/ .
Answer: B
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A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60° below the horizontal?
a. 15 rad/s2 b. 12 rad/s2 c. 18 rad/s2 d. 29 rad/s2 e. 23 rad/s2
A distinctive feature of quarks is that they
A) are always observed singly, since they do not readily interact with other particles. B) have zero charge. C) have zero rest mass. D) have fractional electric charge.
Iron is a poor choice of nuclear fuel because it releases
A) energy only when fused. B) energy only when fissioned. C) no energy when fused or fissioned.
Describe the difference between a solar system and a galaxy
What will be an ideal response?