A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 1.60 × 103 kg/m3
B) 2.50 × 103 kg/m3
C) 2.33 × 103 kg/m3
D) 3.00 × 103 kg/m3
E) 2.67 × 103 kg/m3
E
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State the law of conservation of angular momentum for a system
What will be an ideal response?
Sunspots
a. are hotter than their surroundings. b. are regions where material is rising from below the photosphere. c. show the Zeeman effect indicating the presence of strong magnetic fields. d. produce spicules. e. are generally found near the poles of the Sun during sunspot maximum.
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 126 J
The number of molecules in one mole of a substance
A) depends on the molecular weight of the substance. B) depends on the atomic weight of the substance. C) depends on the density of the substance. D) depends on the temperature of the substance. E) is the same for all substances.