The average rate of erosion on the Moon is far less than on Earth because:
A) the crust of the Moon is much denser than the Earth's crust.
B) the Moon is much younger than the Earth.
C) the Moon lacks wind, water and an atmosphere.
D) the Moon's magnetic field protects it from the solar wind better than ours does.
E) the Moon's mare long ago dried up, so there is no more wave erosion there.
C
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In the Drake equation, Nc = N* × fp × nHZ × fL × fI × fs, the factor Nc is:
A) the number of planets in a solar system. B) the average number of stars that have planets. C) the average number of planets in each solar system suitably placed in the habitable zone. D) the number of technological civilizations in the Milky Way Galaxy with which you might communicate.
A 20.0 kg box slides down a 12.0 m long incline at an angle of 3.0 degrees with the horizontal. A force of 50.0 N is applied to the box to try to pull it up the incline. The applied force makes an angle of 0.00 degrees to the incline. If the incline has a coefficient of kinetic friction of 0.100, then the increase in the kinetic energy of the box is
A. 300 J. B. 372 J. C. 410 J. D. 455 J. E. 525 J.
A pure capacitor is connected to an AC power supply. In this circuit, the current
A) leads the voltage by 90°. B) lags the voltage by 90°. C) lags the voltage by 180°. D) is in phase with the voltage. E) none of the given answers
Determine the rate of heat flow per foot length from the inner to the outer surface of the molded insulation in the accompanying sketch. Use k = 0.17 W/( m K).
GIVEN
The object with a cross section as shown in the sketch below
The thermal conductivity (k) = 0.17 W/(m K)
FIND
The rate of heat flow per foot length from the inner to the outer surface (q)
ASSUMPTIONS
The system has reached steady state
The thermal conductivity does not vary with temperature
Two dimensional conduction
SKETCH
