In the Grand Unified Theory, the superforce was
A) only dark energy.
B) a union of the strong and weak nuclear, and electromagnetic forces.
C) only in effect at low energies.
D) a union of all matter and energy.
E) a union of the weak and electromagnetic forces.
B
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A spinning neutron star has been observed at the center of a
A) supernova remnant. B) planetary nebula. C) red supergiant. D) protostar.
What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 68 m?
a. 5 Hz b. 23120 Hz c. 340 Hz d. 0.2 Hz
Earth's axis is tilted ______________ degrees from the normal to the ecliptic plane
a. zero b. 90 c. 45 d. 23.5
Each of the following is a prediction of the theory of relativity. Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) If you observe someone moving by you, you'll see their time running slowly. B) Gravity is curvature of spacetime. C) E = mc2 D) Time runs slower on the surface of the Sun than on Earth. E) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.