We often find dark nebulae associated with bright H II regions
Indicate whether the statement is true or false
TRUE
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According to Archimedes’ principle, the buoyant force
A. is equal to the mass of the object B. is always greater than the weight of the object C. is equal to the weight of the displaced fluid D. is less than the weight of the displaced fluid if the object sinks
A spherically symmetric planet has four times the Earth's mass and twice its radius. If a jar of peanut butter weighs 12. N on the surface of the Earth, how much would it weigh on the surface of this planet?
A) 18 N B) 12 N C) 30 N D) 6 N E) 24 N
48 grams of oxygen at room temperature consists of how many moles?
a. 3.0 b. 1.5 c. 0.75 d. more than 3.0 e. less than 0.75
Making a laser work depends on creating a population inversion, meaning a situation in which:
a. most electrons are in the lower energy state. b. most photons are in the lower energy state. c. more electrons are in a high-energy than a low-energy state. d. the directions of electron motion are reversed, or inverted. e. more photons are in a high-energy than a low-energy state.