True or False: A radioactive atom always decays after two half-lives have elapsed
1.False
2.True
1
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The SI unit of heat is the ______________
Fill in the blank(s) with correct word
A 6.00 kg mass is located at (1.0 m, –2.00 m, 3.00 m), a 5.00 kg mass is located at (1.0 m, 3.00 m, – 2.00 m), and a 4.00 kg mass is located at (–1.0 m, –2.00 m, 2.00 m). The center of gravity of the system of masses is
A. (5/15m, -1/15m, 17/15m). B. (5/15m, -17/15m, 5/15m). C. (12/15m, -5/15m, 16/15m). D. (7/15m, -5/15m, 16/15m). E. (16/15m, -1/15m, 17/15m).
When the temperature of the Sun's core goes up, what happens next?
A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.
How do we learn the chemical composition of the interstellar medium?
A) We make an educated guess based on the Sun's composition. B) By studying spectra of interstellar gas clouds. C) We collect samples of gas and dust from interstellar space. D) We use computer simulations of the interstellar medium.