Which of the following played the most important role in the ring's formation?
A) Saturn's differential rotation
B) Saturn's Roche limit
C) Saturn's distance from the Sun
D) debris from volcanoes on Mimas
E) tidal resonance with Titan
B
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A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the acceleration due to gravity at the surface of Mars, what is the acceleration due to gravity at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16
At a certain instant, coil A is in a 10-T external magnetic field and coil B is in a 1-T external magnetic field. Both coils have the same area and are oriented at right angles to the field. Which coil will have a greater emf induced in it?
A) coil A B) coil B C) It is impossible to know without more information about the fields.
A potter's wheel decelerates from 50 rev/min to 30 rev/min in 5.0 s, with a constant deceleration. What is the magnitude of the deceleration?
A) 4.0 rad/s2 B) 0.42 rad/s2 C) 25 rad/s2 D) 38 rad/s2 E) 20 rad/s2
Lens-Maker Formula: A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. The lens has equal-magnitude radii of 83 cm and a refractive index of 1.6. (a) What is the distance d from the image to the screen?(b) What is the total distance L between the object and the image?
A. (a) d = 138 cm (b) L = 276 cm B. (a) d = 276 cm (b) L = 552 cm C. (a) d = 69 cm (b) L = 35 cm D. (a) d = -138 cm (b) L = -276 cm