How does the explosion of a nuclear bomb provide evidence of the theory of relativity?
A) The bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation.
B) The mass of the bomb when it explodes is much greater than its normal mass.
C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates.
D) The bomb produces energy in accord with E = mc2, which is part of the theory of relativity.
D
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Which of the following is a difference between low-mass stars and medium-mass stars?
A) Unlike medium-mass stars, low-mass stars can ignite hydrogen and helium. B) Unlike medium-mass stars, low-mass stars develop an inert helium core surrounded by unprocessed hydrogen. C) Unlike medium-mass stars, low-mass stars are not completely convective. D) Unlike medium-mass stars, low-mass stars cannot become giant stars.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is 334,000 J
a. True b. False Indicate whether the statement is true or false
How is chromatic aberration corrected in large astronomical reflecting telescopes?
A. a combination of lenses designed to cancel the aberrations B. use a parabolic mirror instead of a spherical mirror C. a properly constructed telescope has no aberration D. change the resolution of the telescope
Which of the following provides the strongest evidence to support the claim that there is a black hole at the center of our galaxy?
A) We observe many sources of x-rays near the center of our galaxy. B) Infrared and radio observations show a large concentration of gas near the center of our galaxy. C) The motions of the gas and stars indicate that the galactic center has a mass millions of times that of the Sun within a region less than 1 light-year across. D) We observe a large, dark object that absorbs all light at the center of our galaxy.