A rock is thrown straight down with an initial velocity of 14.3 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)
a. 81 m
b. 48 m
c. 38 m
d. 22 m
e. 31 m
b
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I take 2.0 kg of ice and dump it into 1.0 kg of water and, when equilibrium is reached, I have 3.0 kg of ice at 0°C. The water was originally at 0°C. The specific heat of water = 1.00 kcal/kg•°C, the specific heat of ice = 0.50 kcal/kg•°C, and the latent heat of fusion of water is 80 kcal/kg. The original temperature of the ice was:
a. one or two degrees below 0°C. c. -120°C. b. -80°C. d. The whole experiment is impossible.
A uniform rope hangs from a ceiling. Without tugging on the rope, you give the bottom of the rope a wiggle and a wave travels upward along the rope. What can you say about the speed of the wave as the wave travels up the rope?
What will be an ideal response?
What happens to an object supported by degeneracy pressure as the object cools with time?
A) The degeneracy pressure weakens and the object collapses. B) The degeneracy pressure strengthens and the object expands. C) The degeneracy pressure is unaffected by the temperature change, so the object remains stable.
Evidence that the Earth was nearly molten at one time comes from the differentiation of materials by ________ from core to crust
Fill in the blank(s) with correct word