Microscopic slush in ice water tends to make water density
A) lower.
B) higher.
C) sustain at one value.
Answer: A
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Doppler Effect: You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling at constant speed 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 frequency of the siren? The speed of sound in air is 343 m/s.
A. 1850 Hz B. 2000 Hz C. 2050 Hz D. 2010 Hz E. 1980 Hz
The energy of the Sun starts as radiation, but is actually transported to its surface by convection, where it is radiated off into space at last
Indicate whether the statement is true or false
Two identical objects are released from rest from heights R and 2R above the surface of the Earth. After traveling a distance R/2, which object has the larger speed?
Asteroids are thought to be
a. the remains of a planet between Mars and Jupiter that broke up. b. escaped small moons. c. leftover planetesimals from the inner solar system. d. leftover planetesimals from the outer solar system.