Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have
a. the smaller period. b. the greater period. c. the smaller gravitational mass.
d. the larger gravitational mass.
e. the larger universal gravitational constant.
B
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Uniform Circular Motion: The curved section of a horizontal highway is a circular unbanked arc of radius 740 m. If the coefficient of static friction between this roadway and typical tires is 0.40, what would be the maximum safe driving speed for this horizontal curved section of highway?
A. 54 m/s B. 52 m/s C. 50 m/s D. 48 m/s E. 46 m/s
A galvanometer calibrated to read current is
A) an ammeter. B) a voltmeter. C) an ohm meter. D) none of the above
What did Becquerel discover about uranium?
a. That some uranium salts fluoresced in sunlight. b. That all uranium salts fluoresced in sunlight. c. That X rays striking some uranium salts produced visible light. d. That fluorescent light can pass right through the light proof covering used then for photographic plates. e. That all uranium salts would expose photographic film with or without exposure to light.
While looking into a mirror, you notice that the image of a tree is projected onto the back of a chair (the positions of the tree and image are shown here). You must be looking into
A. a convex mirror. B. a concave mirror. C. a plane mirror. D. a negative mirror.