Complete the equation: CH3CH = CH2+ H2? ____________________
Fill in the blank(s) with correct word
CH3CH2CH3
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A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source remains at 6 amperes
a. True b. False Indicate whether the statement is true or false
Heat is transferred at a rate of 0.1 kW through glass wool insulation (density = 100 kg/m3 ) with a 5 cm thickness and 2 m2 area. If the hot surface is at 70°C, determine the temperature of the cooler surface.
GIVEN
• Glass wool insulation with a density (?) = 100 kg/m3
• Thickness (L) = 5 cm = 0.05 m
• Area (A) = 2 m2
• Temperature of the hot surface (Th) = 70°C
• Rate of heat transfer (qk) = 0.1 kW = 100 W
FIND
• The temperature of the cooler surface (Tc)
ASSUMPTIONS
• One dimensional, steady state conduction
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
The thermal conductivity of glass wool at 20°C (k) = 0.036 W/(m K)
Which of these, if used to replace gasoline as an automobile fuel, would not contribute to global warming?
A) Synthetic gasoline made from coal B) Electricity from a nuclear power plant C) Electricity from a coal-burning plant D) All of the above would contribute to global warming. E) None of the above would contribute to global warming.
According to current understanding, which of the following is required in order for a planet to have rings?
A) The planet must orbit its star at a distance greater than Mars orbits the Sun. B) The planet must have many small moons that orbit relatively close to the planet in its equatorial plane. C) The planet must once have had a large moon that came too close to it, shattering the moon and creating the ring particles. D) The planet must be at least as massive as Saturn.