You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a.
0.
b.
mgr.
c.
2mgr.
d.
a function of the angular velocity.
e.
small at first, then increasing as the Frisbee loses the torque given it by your hand.
a
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Most Greek philosophers believed in a(n) _______________ Universe
Fill in the blank(s) with correct word
Sirius, the brightest star in the night sky, is actually a binary star system. Sirius A is main-sequence star and Sirius B is a white dwarf. Nearly all the visible light we see from Sirius comes from Sirius A. But when we photograph the system with x-ray light, as shown here, Sirius B is the brighter of the two stars. Why?
A) As a white dwarf, Sirius B is much hotter than Sirius A and thus emits more x-rays. B) As a white dwarf, Sirius B is too small to emit visible light but not too small to emit x-rays. C) Sirius B is brighter in x-rays because it is a nova. D) Sirius B is brighter in x-rays because it is a white dwarf supernova.
Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
A) 30. km Westward + 40. km Northward B) 50. km Northwest C) 40. km Westward + 30. km Northward D) 30. km Northward + 30. km Westward E) 40. km Eastward + 30. km Southward
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.