Earth satellites are typically more than 100-km high so as to mainly be above the Earth's
A) atmosphere.
B) gravitational influence.
C) both of these
D) none of the above
Answer: A
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Which of the following best describes what would happen if a 1.5-solar-mass neutron star, with a diameter of a few kilometers, were suddenly (for unexplained reasons) to appear in your hometown?
A) The entire mass of Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. B) It would rapidly sink to the center of Earth. C) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole. D) It would crash through Earth, creating a large crater, and exit Earth on the other side. E) It would crash into Earth, throwing vast amounts of dust into the atmosphere which in turn would cool Earth. Such a scenario is probably what caused the extinction of the dinosaurs.
A plane wall of thickness 2L has internal heat sources whose strength varies according to 0q is the heat generated per unit volume at the center of the wall (x = 0) and a is a constant. If both sides of the wall are maintained at a constant temperature of Tw, derive an expression for the total heat loss from the wall per unit surface area.
GIVEN
A plane wall with internal heat sources Heat source strength: q
Gcos (ax) Wall surface temperatures = Tw Wall thickness = 2L
FIND
An expression for the total heat loss per unit area (q/A)
ASSUMPTIONS
Steady state conditions prevail
The thermal conductivity of the wall (k) is constant
One dimensional conduction within the wall
SKETCH
How much energy is required to remove one proton from 9Be?
What will be an ideal response?
Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 44.0° to that of polarizer 1 . What fraction of the intensity of the original light gets though the second polarizer?
a. 0.360 b. 0.518 c. 0.259 d. 0.720 e. 0.500