A black hole is an object whose escape velocity is equal to ________
Fill in the blank(s) with correct word
the speed of light
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Parallel Wires: Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive. (?0 = 4? × 10-7 T ? m/A)
A. 2.7 × 10-5 N repulsive B. 7.2 × 10-5 N repulsive C. 3.4 × 10-5 N attractive D. 2.7 × 10-5 N attractive E. 7.2 × 10-5 N attractive
The phase angle of an LRC series circuit with an inductive reactance of 200 ?, a resistor of 200 ? and a certain capacitor at 1000 Hz is 40.0°. What is the value of the capacitance in this circuit?
A) 1.95 µF B) 2.95 µF C) 3.95 µF D) 4.95 µF E) 5.95 µF
The radioactive decay of cobalt 56 into iron 56 affects the light curve of a type I supernova about ________ after the initial peak in luminosity
Fill in the blank(s) with correct word
A Doppler red shift indicates
a. a shift toward higher frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.