A body on the surface of the Earth weighs 400 lb. The radius of the Earth is about 4,000 miles. If this same body were placed on a 4,000-mile-high tower, its weight would be __________
Fill in the blank(s) with correct word
100 lb
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The critical temperature the core must reach for a star to shine by fusion is
A) 5,800 K. B) 11,000 K. C) 127,000 K. D) 10 million K. E) 100 million K.
A small 0.050-kg insulating sphere carries a charge of -60 ?C and is hanging by a vertical silk thread from a fixed point in the ceiling
An external uniform vertical electric field is now applied. If the applied electric field has a magnitude of 3000 N/C and is directed downward, what is the tension in the silk thread? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 0.19 N B) 0.31 N C) 0.41 N D) 0.52 N E) 0.71 N
A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners
In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 1.0 × 106 V B) infinite C) 1.0 × 105 V D) 0 V E) 1.0 × 104 V
Unpolarized light passes through three polarizing filters. The first one is oriented with a horizontal transmission axis, the second filter has its transmission axis 25.7° from the horizontal, and the third one has a vertical transmission axis
What percent of the light gets through this combination of filters? A) 92.4% B) 50.0% C) 0.00% D) 7.6%