As the solar nebula contracts due to gravitation, the cloud:
A) spins faster.
B) expands.
C) becomes more spherical in shape.
D) changes direction of motion.
E) begins to cool.
A
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If a satellite is in orbit around Earth and the satellite's altitude increases, then the circular velocity __________________
a. decreases b. increases c. is zero d. None of the other choices are correct.
Banked Curves: Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger-radius curve?
A. v /
B. 2v
C. v
D. v/2
Buoyant force is greatest on a submerged 1-cm3 block of
A) lead. B) aluminum. C) same on each
Which statement best explains why we are able to see details of a distant object more clearly?
A. the image formed by the telescope is larger than the object B. the image formed by the telescope subtends a larger angle at the eye than the object does C. the intermediate image formed by the objective lens is greatly magnified D. both the objective and eyepiece form real images