An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^?6 (°C)?1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g/°C.)
a. 7.2 × 10^5
b. 7.2 × 10^7
c. 7.2 × 10^3
d. 7.2 × 10^1
e. 7.2 × 10^2
b
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Which inductor carries the larger current?
A. Inductor 1 B. Inductor 2 C. The current or change in current is the same in both. D. One needs more information to answer the question.
The purpose of the Michelson-Morley experiment was to
A. detect possible motion of the sun relative to the ether. B. detect possible motion of the Earth relative to the ether. C. detect possible motion of the Earth relative to the sun. D. determine the velocity of light.
Contrast the atmosphere of Venus with its clouds
What will be an ideal response?
In a hypothetical stream flowing downslope, stream discharge doubles while the channel remains the same size and shape. For this situation, what will happen to the stream's speed?
What will be an ideal response?