Solenoid: Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the radius of the solenoid is doubled to 2b, but all the other quantities remain the same, the magnetic field inside the solenoid will
A. remain the same.
B. become twice as strong as initially.
C. become one-half as strong as initially.
D. become four times as strong as initially.
E. become one-fourth as strong as initially.
Answer: A
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Assume that Hubble's constant is 22 kilometers per second per million light-years. Then we would expect a galaxy 100 million light-years away to be moving (Assume the motion is due only to Hubble's law.)
A) away from us at 2,200 km/s B) away from us at 220 km/s C) toward us at 2,200 km/s D) away from us at 22,000 km/s
A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If the radiant heat that the roof receives from the sun is 600 W/m2 , the convection heat transfer coefficient between the roof and the air is 12 W/(m2 K), and the air temperature is 27°C, determine the roof temperature for the following two cases: (a) Radiative heat loss to space is negligible. (b) The roof is black (? = 1.0) and radiates to space, which is assumed to be a black-body at 0 K.
GIVEN
FIND
ASSUMPTIONS
- Steady state prevails
- No heat is lost from the bottom of the plate
SKETCH
The Earth's layer with plastic-like behavior is the
A) mantle. B) crust. C) inner core. D) outer core.
A rain shadow is associated with
A) the leeward slope of a mountain. B) orographic lifting. C) descending dry air. D) descending dry air on the leeward slope of a mountain.