If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape
a. True
b. False
Indicate whether the statement is true or false
True
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A car travels east with a constant velocity. The magnitude of the acceleration of the car is
A) decreasing. B) increasing. C) constant non-zero. D) zero. E) None of the other choices is correct.
The resistance of a conducting material depends on its composition, length, diameter, and temperature
a. True b. False Indicate whether the statement is true or false
A 1938-nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density?
A) 29.1 × 103 kg/m3 B) 7.26 × 103 kg/m3 C) 9.25 × 103 kg/m3 D) 2.31 × 103 kg/m3 E) 71.2 × 103 kg/m3
A point charge is located at the origin. Centered along the x axis is a cylindrical closed surface of radius 10 cm with one end surface located at x = 2 m and the other end surface located at x = 4 m. If the magnitude of the electric flux through the surface at x = 2 m is 4 N × m2/C, what is the magnitude of the electric flux through the surface at x = 4 m?
a. 1 N × m2/C b. 2 N × m2/C c. 4 N × m2/C d. 16 N × m2/C e. The correct value is not given.