Hydrostatic equilibrium in our Sun is the balance between
A) convection and radiation.
B) convection and gravitation.
C) pressure and radiation.
D) radiation and gravitation.
E) gravitation and pressure.
E
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Why is Venusian lava less viscous than Earth's?
A. There is more water in Earth's lava. B. Earth's rapid rotation stirs its lava, making it thinner. C. Earth's surface has a lower temperature. D. Atmospheric pressure on Venus is much higher than on Earth.
If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then:
A) the source is approaching us at 1 % of the speed of light. B) the source is approaching us at 0.1 % of the speed of light. C) the source is receding from us at 10% of the speed of light. D) the source is getting 1% hotter as we watch. E) the source is spinning very rapidly, at 1% of the speed of light.
What are the properties of the neutral hydrogen gas that exists in the interstellar medium?
What will be an ideal response?
Two masses m1 and m2, with m1 > m2, have momenta with equal magnitudes. How do their kinetic energies compare?
a. KE1 < KE2 c. KE1 > KE2 b. KE1 = KE2 d. More information is needed.