A white dwarf is a former
A) low-mass star.
B) high-mass star.
C) white giant.
Answer: A
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When a ball undergoes a one-dimensional elastic collision with a wall, the velocity of the ball is reversed, while the wall remains stationary. Explain why this does not violate conservation of momentum
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Which of the following is not a major influence on atmospheric circulation?
A) the Coriolis force B) the unequal solar heating of Earth C) the distribution of continents and oceans D) the major topographic features on the continents E) the local variations in gravitational acceleration
A boat that contains a heavy anchor floats in a small lake. If the anchor is thrown overboard such that it rests upon the lake bottom, which of the following will happen?
(i) The level of the water in the lake will go down slightly. (ii) The level of the water in the lake will go up slightly. (iii) The level of the water in the lake will stay exactly the same. (iv) The waterline on the boat will go up (that is, the boat will sink slightly). (v) The waterline on the boat will go down (that is, the boat will rise slightly). (vi) The water line on the boat will stay the same.
1.(i) and (v) 2.(ii) and (iv) 3.(iii) and (vi) 4.(iii) and (v)When a boulder and a pebble are dropped, why does the pebble pick up speed as quickly as the boulder, even though less gravity acts on it? In other words, why do both accelerate equally?
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