In a reversible cycle
1.the change in the entropy of the system (measured over the whole cycle) is always zero.
2.the change in the entropy of the system (measured over the whole cycle) may be zero, but it isn't necessarily always zero.
3.The change in the entropy of the system (measured over the whole cycle) is always greater than zero.
4.The change in the entropy of the system (measured over the whole cycle) is always less than zero.
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Simple Harmonic Motion: A sewing machine needle moves in simple harmonic motion with a frequency of 2.5 Hz and an amplitude of 1.27 cm.(a) How long does it take the tip of the needle to move from the highest point to the lowest point in its travel?(b) How long does it take the needle tip to travel a total distance of 11.43 cm?
What will be an ideal response?
As you increase in altitude in the atmosphere, the speed of sound _________
Fill in the blank(s) with correct word
When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called
A) photons. B) wavicles. C) gamma rays. D) frequencies.
Ozone in the Earth's upper atmosphere
A) filters incoming infrared light reaching Earth's surface. B) filters incoming visible light reaching Earth's surface. C) filters incoming ultraviolet radiation reaching Earth's surface. D) acts as a blanket to keep Earth's surface warm.