The most important geological process occurring on Mars today is
A) water erosion
B) plate tectonics
C) volcanism
D) wind erosion
D
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A 200-g metal container, insulated on the outside, holds 100 g of water in thermal equilibrium at
A 21-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.00°C. Assume there is no heat exchange with the surroundings. For water, the specific heat is 4190 J/kg · K and the heat of fusion is 3.34 × 105 J/kg. The specific heat for the metal is closest to A) 3850 J/kg ? K. B) 2730 J/kg ? K. C) 4450 J/kg ? K. D) 4950 J/kg ? K. E) 5450 J/kg ? K.
Planet A has twice the mass of Planet B. From this information, what can we conclude about the free-fall acceleration at the surface of Planet A compared to that at the surface of Planet B?
A) The free-fall acceleration on Planet A must be twice as great as the free-fall acceleration on Planet B. B) The free-fall acceleration on Planet A must be four times as great as the free-fall acceleration on Planet B. C) The free-fall acceleration on Planet A is the same as the free-fall acceleration on Planet B. D) The free-fall acceleration on Planet A is greater than the free-fall acceleration on Planet B, but we cannot say how much greater. E) We cannot conclude anything about the free-fall acceleration on Planet A without knowing the radii of the two planets.
How does the distance traveled vary with time in uniform linear motion? (Hint: Examine Eq. 4.1 in the Laboratory Guide.)
A 14-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?
a. 2.6 N b. 21 N c. 49 N d. 36 N e. 190 N