The length of a 100-meter long spaceship passing by you at 0.87c is seen to be
A) 50 m.
B) 87 m.
C) 100 m.
D) 125 m.
E) 150 m.
Answer: A
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If you were to fall into a black hole, the ________ would kill you by tearing you apart
Fill in the blank(s) with correct word
Peak values for a neodymium-glass laser are 600 J for 1.00 nanosecond. If the cross-section of the laser beam is 1.10 cm2, what are the maximum values of E and B? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 2.0E+9 V/m, 1.9 T b. 5.7E+8 V/m, 6.8 T c. 2.0E+9 V/m, 6.8 T d. 5.7E+8 V/m, 1.9 T e. Not enough information.
The most basic and irrefutable proof that energy cannot be created out of nothing or completely destroyed is that
a. Newton's laws of motion require it. b. no proof is necessary. Energy is energy. c. no experiments have ever proved the contrary. d. the Sun would long since ceased to shine. e. it would contradict Einstein's relativity.
Other than Earth, which of the following has visible polar caps?
A) Mercury B) Venus C) The Moon D) Mars E) Jupiter