Based on current understanding, the minimum mass of a black hole that forms during a massive star supernova is roughly
A) 0.5 solar masses.
B) 1.4 solar masses.
C) 3 solar masses.
D) 10 solar masses.
C) 3 solar masses.
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Phase Angles: A 60.0-?F capacitor is in series with a 100-? resistor connected across an ac source of frequency 120 Hz. What is the phase angle?
A. -12.5° B. +12.5° C. -77.6° D. +77.6° E. 90.0°
A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard later, at which time the line of sight to the aircraft forms a 56° angle with respect to the horizontal. The speed of sound is 325 m/s
What is the Mach number (the ratio of the speed of the jet to the speed of sound) for the aircraft? A) 1.2 B) 1.8 C) 1.9 D) 2.1 E) 2.2
When the midpoint of the face of the Sun appears to be on the horizon, where is the actual midpoint from the point of view of the observer?
a. above the horizon at sunrise and below the horizon at sunset b. on the horizon c. below the horizon d. above the horizon
Since the mass of an object is the same for all observers, it is a relativistically ____________ quantity
Fill in the blank(s) with correct word