Latitude Lines Run
What will be an ideal response?
Flat (Lat is Flat) or basically North to South
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An electric heating blanket is subjected to an acceptance test. It is to dissipate 400 W on the high setting when hanging in air at 20°C. (a) If the blanket is 1.3-m-wide: what is the length required if its average temperature at the high setting is to be 40°C, (b) If the average temperature at the low setting is to be 30°C, what rate of dissipation is possible?
GIVEN
• An electric blanket hanging in air
• Heat dissipation rate (qh) = 400 W
• Air temperature (T?) = 20°C
• Blanket width (w) = 1.3 m
• Average temperatures ? High (Tsh) = 40°C
? Low (Ts1) = 30°C
FIND
(a) The length of the blanket (L) (b) Heat dissipation rate on the low setting (q1) ASSUMPTIONS
• Air is still
• Moisture in the air has a negligible effect
• Blanket is hung vertically with its 1.3 m sides vertical
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperatures for the two settings
The "acceleration of gravity" is 9.8 m/s2 everywhere on the surface of the Earth
Indicate whether the statement is true or false
A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done on the gas during this process?
A) 0 J B) 400 J C) -400 J D) -200 J E) 200 J
A light ray in air is incident on an air to glass interface at an angle of 45° and is refracted at an angle of 30° to the normal. What is the index of refraction of the glass?
A) 1.23 B) 1.31 C) 1.41 D) 1.52 E) 1.74