The youngest parts of Earth's crust are
a. the bottom layer found in the walls of the Grand Canyon.
b. the continents.
c. the continental margins.
d. the Appalachian Mountains.
e. the mid-ocean rifts.
e
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A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s2
a. 0.35 s c. 0.70 s b. 0.42 s d. 0.89 s
Thermodynamic Devices: A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump?
A. 3.9 B. 4.9 C. 2.9 D. 0.26 E. 22
Relate escape velocity to the event horizon
What will be an ideal response?
A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A) 0.18 N/m2 B) 0.36 N/m2 C) 1800 N/m2 D) 3600 N/m2