The molecular weight of carbon dioxide is 44.0 g/mol. What is the internal energy in 3.00 kg of carbon dioxide at 300 K? As an approximation, treat the carbon dioxide gas as if it was monatomic
A) 2.55 × 105 J
B) 1.70 × 105 J
C) 2.55 × 104 J
D) 1.70 × 104 J
E) 1.70 × 106 J
A
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Free Fall: When a ball is thrown straight up with no air resistance, the acceleration at its highest point
A. is upward. B. is downward. C. is zero. D. reverses from upward to downward. E. reverses from downward to upward.
Thinking about the formation of the solar system, what trend in composition would you expect to see from the inside to the outside of the asteroid belt?
A. asteroids with hydrogen and carbon compounds, progressing toward asteroids made primarily of iron and silicates B. essentially the same composition all the way through C. iron asteroids progressing more toward one with silicates D. rockier asteroids progressing toward ones with more hydrogen and carbon compounds E. asteroids with hydrogen and carbon compounds, progressing toward asteroids made primarily of ice
Pigeons navigate primarily by
A) a good memory. B) a keen sense of smell. C) magnetic sensors in their heads. D) ultra-high-pitched sounds. E) none of the above
A 6.0-kg block slides along a horizontal surface. If µk = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?
a. ?59 W b. ?47 W c. ?71 W d. ?82 W e. +71 W