The sun has apparent brightness B at the earth, which is 1.5 × 108 km away
What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun?
A) 0.063 B B) 0.00063 B C) 0.025 B D) 0.25 B
B
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Which of the following is not predicted by Einstein's special theory of relativity?
A) the constancy of the speed of light B) no material object can reach or exceed the speed of light C) time dilation D) the equivalence of mass and energy E) length contraction
According to a postulate of Einstein, which of the following describes the nature of the laws of physics as one observes processes taking place in various inertial frames of reference?
a. Laws are same only in inertial frames with zero velocity. b. Laws are same only in inertial frames moving at low velocities. c. Laws are same only in inertial frames moving at near speed of light. d. Laws are same in all inertial frames.
The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200 ?, L = 0.100 H, and C = 1.00 ?F. What are the impedance Z and the phase angle ??
a. 200 ?, ?37.0° b. 566 ?, +87.0° c. 2470 ?, ?85.4° d. 2540 ?, ?88.8° e. 393 ?, ?63.0°
A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s b. 23 s c. 25 s d. 27 s e. 17 s