A hot piece of iron is thrown into the ocean and its temperature eventually stabilizes. Which of the following statements concerning this process is correct? (There may be more than one correct choice.)
A) The change in the entropy of the iron-ocean system is zero.
B) The entropy gained by the iron is equal to the entropy lost by the ocean.
C) The entropy lost by the iron is equal to the entropy gained by the ocean.
D) The ocean gains more entropy than the iron loses.
E) The ocean gains less entropy than the iron loses.
D
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What happens to a simple pendulum's frequency if both its length and mass are increased?
A) It remains constant. B) It decreases. C) It increases. D) It could remain constant, increase, or decrease; it depends on the mass to length ratio (mass density).
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.You drop the box. As it falls to its original level, its kinetic energy is __________
Fill in the blank(s) with correct word
The average density of blood is 1.06 × 103 kg/m3. If you donate a pint of blood to the Red Cross, how many grams of blood have you donated? (2.00 pt = 1.00 qt, 1.00 L = 1000 cm3, 1.00 qt = 0.947 L, and density is mass per unit volume.)
A) 502 g B) 0.502 g C) 5020 g D) 5.02 × 105 g E) 5.02 g
Raising the temperature of air will
1.decrease the speed of sound in the air. 2.increase the speed of sound in the air. 3.not affect the speed of sound in the air. 4.sometimes increase and sometimes decrease the speed of sound in air.