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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
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Question
Answer
11
In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse?It's partially blocked by glass.
11
In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to:get warmer.
11
In winter, light-colored clothes will keep you warmer than dark-colored clothes if:you are warmer than your surroundings.
11
Marc attaches a falling 500-kg object with a rope through a pulley to a paddle wheel shaft. He places the system in a well-insulated tank holding 25 kg of water. When the object falls, it causes the paddle wheel to rotate and churn the water. If the object falls a vertical distance of 100 m at constant speed, what is the temperature change of the water? (1 kcal = 4 186 J, the specific heat of water is 4 186 J/kg×°C, and g = 9.8 m/s^2)4.7 C°
11
Of the following systems, which contains the most heat?Systems do not contain heat.
11
Of the planets with atmospheres, which is the warmest? 1) Venus 2) Earth 3) Mars 4) Jupiter 5) SaturnVenus
11
On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand?specific heat
11
Sea breezes that occur near the shore are attributed to a difference between land and water with respect to what property?specific heat
11
The emissivity of an ideal reflector has which of the following values?0
11
The filament temperature of a light bulb is 2 000 K when the bulb delivers 40 W of power. If its emissivity remains constant, what power is delivered when the filament temperature is 2 500 K?98 W
11
The first experiment, which systematically demonstrated the equivalence of mechanical energy and heat, was performed by:Joule
11
The surface of the Sun has a temperature of about 5 800 K. If the radius of the Sun is 7*10^8m, determine the power output of the sun. (Take e = 1, and s = 5.67*10^-8 W/m&=^2×K^4).3.95*10^26 W
11
The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process?radiation
11
The thermal conductivity of aluminum is 238 J/s·m·ºC and of copper is 397 J/s·m·ºC. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by the aluminum to the heat transferred by the copper?0.599
11
The tungsten filament of a light bulb has an operating temperature of about 2 100 K. If the emitting area of the filament is 1.0 cm2 , and its emissivity is 0.68, what is the power output of the light bulb? (s = 5.67*10^-8 W/m^2×K^4)75 W
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