The coldest region of the atmosphere is the
a. stratosphere.
b. troposphere.
c. mesosphere.
d. thermosphere.
c
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If a reaction involving hadrons were written at the quark level as , what is the quark composition of the unknown last particle?
A. udd
B. 
C. uds
D. 
E. More information is needed.
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
A bar magnet passes through a circular loop of wire as shown below. At the instant that the middle of the magnet passes through the loop, the induced current ( as seen from the coil # 2) is
A. ccw and increasing.
B. cw and decreasing.
C. cw and increasing.
D. zero.
Of the following systems, which contains the most heat?
a. 100 kg of water at 80°C b. 250 kg of water at 40°C c. 600 kg of ice at 0°C d. Systems do not contain heat.