Two Mercury years are the same length as three Mercury sidereal days
Indicate whether the statement is true or false
TRUE
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Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star. B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants. C) It doesn't make sense to find a subgiant in a binary star system. D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.
A refrigerator
A) produces cold. B) causes internal energy to disappear. C) transfers internal energy from inside to outside. D) transfers heat into cold. E) none of the above
A magnet on a frictionless mount would have its magnetic north pole point toward the Earth’s geographic
A. south pole B. north pole
A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
a. 48 cm b. 17 cm c. 31 cm d. 69 cm e. 52 cm