In each of the processes described below, energy flows across the boundary of the object that serves as the subject of each sentence. Is this energy flow heat (A), work (B), or some other kind of energy transfer (E)?
(a) The sun emits light into space.
(b) You get cooler when standing in the breeze from a fan.
(c) Your car’s brakes get hot when used repeatedly.
(d) Your hands get warm when you rub them together.
(e) Your pizza gets warm in the microwave.
(a) The sun emits light into space. -A
(b) You get cooler when standing in the breeze from a fan. -E
(c) Your car’s brakes get hot when used repeatedly. -B
(d) Your hands get warm when you rub them together. -B
(e) Your pizza gets warm in the microwave. -E
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A vertical side of a cooling tower is approximately 90ºC when the surrounding air is 25ºC. If the tower is 30 m high, estimate the maximum vertical velocity of the air due to natural convection.
What will be an ideal response?
Compared the Galilean satellites, the larger satellites of Saturn have ________ average density.
A. lower B. higher C. about the same (as the Galilean satellites)
When you simultaneously drop a light tennis ball and a heavy bowling ball, they hit the floor
A) at the same speed. B) with the same force. C) with the same momentum. D) all of the above E) none of the above
Galena belongs to the class of minerals known as the
A) sulfides. B) sulfates. C) silicates. D) carbonates.