Einstein rejected the classical idea that space and time are
A) two parts of a whole.
B) connected to each other.
C) independent of each other.
Answer: C
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If the distance a spring is stretched from its equilibrium position is halved the potential energy of the spring is multiplied by
A. 4 B. 2 C. 0.5 D. 0.25
What color does the planet Mars appear to the naked eye in the sky?
A) yellow B) white C) blue D) red
The idea of inflation makes one clear prediction that, until the discovery of an accelerating expansion, seemed to contradict the available observations. What is this prediction?
A) Inflation predicts that the early universe should have regions of enhanced density that could have acted as "seeds" for the formation of galaxies and large structures. B) The universe should be geometrically "flat" (in the four dimensions of spacetime). C) Inflation predicts that the temperature of the cosmic microwave background should be almost (but not exactly) the same everywhere. D) Inflation predicts that the entire universe must be far larger than the observable universe.
If a particle in a box has a ground-state energy of 10.0 eV, what is the energy of the 4th excited state?
A. 20.0 eV B. 40.0 eV C. 160 eV D. 50.0 eV E. 250 eV