You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway
When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s. A) 35 m/s
B) 32 m/s
C) 30 m/s
D) 41 m/s
E) 50 m/s
A
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Our current theories are unable to describe the conditions of the universe during the Planck era. About how long after the Big Bang did the Plank era end?
A) 10-10 second B) 10-35 second C) 10-43 second D) 3 minutes E) 380,000 years
2.00 moles of an ideal gas freely expands from 1.50 liters to 4.00 liters. The change in entropy in the expansion
A. 5.80 J/K B. 8.50 J/K C. 16.3 J/K D. 18.7 J/K
A typical protostar may be several thousand times more luminous than the Sun. What is the source of this energy?
A) Chemical combustion of hydrocarbons B) Nuclear fusion in its core C) From the release of gravitational energy as the protostar continues to shrink D) The ionization of the gas as it heats up E) From nearby hot stars or supernovae that have initiated the star formation process
If a current of negative charge flows in a circle in the direction of one's curled fingers of the right hand, the resulting magnetic field would be in the direction
A. opposite to the thumb of the right hand. B. of the right index finger. C. of due north. D. of the thumb of the right hand.