According to general relativity, what is a black hole?
A) a hole in the observable universe
B) an object that cannot be seen
C) a place where light travels slower than the normal speed of light
D) a place where the strength of gravity is infinite
A) a hole in the observable universe
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What is the full multiplicity of the n=3 level of the H atom?
A. 18 B. 30 C. 16 D. 32 E. 9
A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ?air = 1.25 kg/m3.
A. 7.20 kW B. 14.7 kW C. 21.3 kW D. 29.4 kW E. 39.6 kW
Answer the following statement(s) true (T) or false (F)
1. We can consider a set of all chlorine atoms in a block of salt (sodium chloride) to be a “system.” 2. We can consider that set to be an “extended object.” 3. Consider a three-particle system. The center of mass of this system must lie on the plane that contains all three particles. T or F? Be prepared to explain why or why not. 4. In the situation discussed in problem C4T.10, which would be the easiest reasonably valid frame to use? 5. A reference frame attached to a train is a reasonably good inertial frame if the train is stopped at a station.
An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 2200 N/C B) 1000 N/C C) 1100 N/C D) 4100 N/C E) 2000 N/C