At what speed would a clock be moving so that time dilation would cause it to run slow by 50%?
A. 0.500 c
B. 0.750 c
C. 0.250 c
D. 0.414 c
E. 0.866 c
E. 0.866 c
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Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the lower block, B?
A. 
B. 
C. 
D. 
E. None of these diagrams is correct.
Volcanic eruptions on one satellite of the outermost jovian planets, Neptune and Uranus, have been photographed by spacecraft. Which satellite, and what is erupting from this type of volcanism?
What will be an ideal response?
What direct evidence do astronomers have that supports the heavy element formation in stars?
A) The presence of technetium in giant star spectra B) Observed elemental abundances C) Gamma-ray emissions from decay of cobalt 56 in supernovae D) Light curves of type-I supernovae E) All of the above are evidence of this.
Without greenhouse gases, Earth's surface would be frozen over
Indicate whether the statement is true or false