A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample?
A)
It does not change.
B)
It quadruples.
C)
It doubles.
D)
It halves.
E)
none of the above
A
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Single-celled life ruled the Earth from ________ to ________ billion years ago
Fill in the blank(s) with correct word
Which of the following does not take place in a chemical reaction?
a. New substances are formed. b. Neutrons are released. c. Energy is released or absorbed. d. Reactants disappear.
A low-density, hot gas produces a continuous spectrum
Indicate whether the statement is true or false
A 1.6-kg block is attached to the end of a 2.0-m string to form a pendulum. The pendulum is released from rest when the string is horizontal. At the lowest point of its swing when it is moving horizontally, the block is hit by a 10-g bullet moving horizontally in the opposite direction. The bullet remains in the block and causes the block to come to rest at the low point of its swing. What was
the magnitude of the bullet's velocity just before hitting the block? a. 1.0 km/s b. 1.6 km/s c. 1.2 km/s d. 1.4 km/s e. 1.8 km/s