The antineutron has a quark structure _________.
A. uud
B. udd
C. 
D. 
E. 
D.
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You can only see a rainbow if
A) the sun is behind you. B) the sun is in front of you. C) the sun is 90° to the side. D) the sun is 180° to the side.
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 mT. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV b. 0.20 mV c. 0.17 mV d. 0.27 mV e. 0.34 mV
Galaxy A and galaxy B formed at the same time. Galaxy A is much farther from us than galaxy B. Which of the following is true?
A) Galaxy A will appear younger to us than galaxy B. B) Galaxy A will appear older to us than galaxy B. C) Galaxy A will appear to be the same age as galaxy B.
What did the Martian surface look like from the Viking lander sites?
A) a dry, dusty, boulder-strewn desert B) a huge canyon stretching out to the horizon C) flat, dark volcanic rocks out to the horizon D) very mountainous with huge volcanoes in the distance