An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of
A. 1.0 m
B. 2.3 m
C. 0.19 m
D. 0.43 m
E. 0.81 m
Answer: A
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Our Solar System resides in the _______________ Galaxy
Fill in the blank(s) with correct word
Which of the following is suggested as the best explanation of the missing solar neutrinos?
a. The Sun is fusing helium but not hydrogen. b. Nuclear reactions do not produce neutrinos as fast as theory predicts. c. The Sun may contain matter we haven't yet identified. d. Neutrinos may oscillate between three different flavors. e. None of the others.
Equilibrium: If the sum of the external torques on an object is zero, then the sum of the external forces on it must also be zero.
A. True B. False
Hypothetically, if Planck's constant were smaller, atoms would be
A) larger. B) smaller. C) no different in physical size.