______________ is the only moon in the solar system to have retrograde motion
a. Ganymede
b. Europa
c. Callisto
d. Titan
e. Triton
e
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Light waves reflected off a body of water are strongly polarized in the horizontal direction. To reduce glare polarized sunglasses are made
A. with the transmission axis horizontal. B. with the transmission axis vertical. C. with the transmission axis at 37°. D. Polarized sunglasses don’t help with glare
An index of refraction less than one for a medium would imply that
A) that the speed of light in the medium is the same as the speed of light in vacuum. B) that the speed of light in the medium is greater than the speed of light in vacuum. C) that the speed of light in the medium is less than the speed of light in vacuum. D) refraction is not possible. E) reflection is not possible.
Estimate the rate of heat loss per unit length from a 5 cm ID, 6 cm OD steel pipe covered with high temperature insulation having a thermal conductivity of 0.11 W/(m K) and a thickness of 1.2 cm. Steam flows in the pipe. It has a quality of 99% and is at 150°C. The unit thermal resistance at the inner wall is 0.0026 (m2 K)/W, the heat transfer coefficient at the outer surface is 17 W/(m2 K), and the ambient temperature is 16°C.
GIVEN
Insulated, steam filled steel pipe Diameters
? ID of pipe (Di) = 5 cm=0.05 m
? OD of pipe (Do) = 6 cm=0.06 m Thickness of insulation (Li) = 1.2 cm=0.012 m Steam quality = 99% Steam temperature (Ts) = 150°C Unit thermal resistance at inner wall (A Ri) = 0.026 (m2 K)/W Heat transfer coefficient at outer wall (ho) = 17 W /(m2 K) Ambient temperature (T ) = 16°C Thermal conductivity of the insulation (kI) = 0.11 W /(m K)
FIND
Rate of heat loss per unit length (q/L)
ASSUMPTIONS
1% carbon steel Constant thermal conductivities Steady state conditions
SKETCH
An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?
a. The boat will continue traveling in the circle because there is no friction. b. The boat will continue to travel in the circle because its velocity exerts a force on it. c. The boat will move off on a line tangent to the circle because there is no force on it. d. The boat will move off tangent to the circle because there is a force on it perpendicular to the boat directed to the outside of the circle. e. The boat will move off to the outside perpendicular to the tangent line since a force directed to the outside of the circle always acts on the boat.