A body of water will be deeper when its
A) temperature rises.
B) temperature drops.
C) neither of these
Answer: A
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Wearing layers of clothing in cold weather is often recommended because dead-air spaces between the layers keep the body warm. The explanation for this is that the heat loss from the body is less. Compare the rate of heat loss for single 2 cm thick layer of wool [k = 0.04 W/(m K)] with three 0.67 cm layers separated by 1.5 mm air gaps. The thermal conductivity of air is 0.024 W/(m K).
GIVEN
• Wool insulation
• Thermal conductivities
? Wool (kw) = 0.04 W/(m K
? air (ka) = 0.024 W/(m K)
FIND
• Compare the rate of heat loss for a single 2 cm thick layer of wool to that of three 0.67 cm layers separated by 1.5 mm layers of air gaps.
ASSUMPTIONS
• Heat transfer can be approximated as one dimensional, steady state conduction
SKETCH
The planet Uranus is:
A) easily visible with the naked eye. B) barely visible with the naked eye. C) only visible with a small telescope or binoculars. D) only visible with a large, high quality telescope. E) only visible with a space-based telescope.
Answer the following statement(s) true (T) or false (F)
Suppose that a quanton’s energy is zero, irrespective of its spin orientation. Suppose further that we prepare this quanton in an arbitrary spin state 
. The probability of any possible experimental outcome for any spin observable will then be independent of time.
The masses of most spiral galaxies, like ours, are a few billion solar masses
Indicate whether the statement is true or false