T-Tauri stars have completely inactive chromospheres
Indicate whether the statement is true or false
False
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The density of copper at 
and its linear expansion coefficient is 
Consider a hot cube of copper that is 1.0cm on a side when its temperature is 1356 K. What is the cube’s mass?
A. 8.80 g B. 8.46 g C. 8.78 g D. 8.38 g E. 8.94 g
The Earth's atmosphere and magnetosphere contribute ________% to the total mass of the Earth
Fill in the blank(s) with correct word
Planet A has twice the mass of Planet B. From this information, what can we conclude about the free-fall acceleration at the surface of Planet A compared to that at the surface of Planet B?
A) The free-fall acceleration on Planet A must be twice as great as the free-fall acceleration on Planet B. B) The free-fall acceleration on Planet A must be four times as great as the free-fall acceleration on Planet B. C) The free-fall acceleration on Planet A is the same as the free-fall acceleration on Planet B. D) The free-fall acceleration on Planet A is greater than the free-fall acceleration on Planet B, but we cannot say how much greater. E) We cannot conclude anything about the free-fall acceleration on Planet A without knowing the radii of the two planets.
A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's kinetic energy is transferred to the carbon atom?
a. 14.4% b. 28.4% c. 41.4% d. 56.6%