What is the maximum efficiency of a heat engine operating between 293 Kelvins and 273 Kelvins, the temperatures at the surface and several hundred meters below the surface, respectively, of the ocean?
[Ques. 2] On a winter day the temperature is 5 degrees Celsius and the humidity is 0.003 kilograms per cubic meter. (a) What is the relative humidity? (b) The air is brought into a building and heated to 20 degrees Celsius without changing the humidity. What is the relative humidity inside the building?
[Ques. 3] A baseball with mass 0.14 kilograms and speed 40 m/s is caught. If all of its kinetic energy is converted to internal energy as it is caught, what is its temperature change? (Assume the baseball's specific heat capacity is 1,000 joules per kilogram degree Celsius.)
[Ques. 4] A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at 20 degrees Celsius. How much heat does the ice absorb as it is warmed to 10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)
[Ques. 5] The air inside a bicycle tire pump has 60 joules of work done on it as 20 joules of heat is conducted away from it. What is the change in internal energy of the air?
[Ques. 6] The Eiffel tower in Paris is 300 meters tall on a cold day (T = 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)
[Ques. 7] A material through which heat conducts slowly is called a __________.
Fill in the blank(s) with correct word
[Ques. 8] A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. This is governed by the __________ law of thermodynamics.
Fill in the blank(s) with correct word
[Ques. 9] The air temperature where the humidity reaches the saturation density is called the ___________.
Fill in the blank(s) with correct word
[Ques. 10] In a steam engine, steam at 140C in a turbine does work on an external system, and the steam leaves the turbine at 100C. The efficiency of the steam engine is 5. The relevant physical principle is the __________ law of thermodynamics.
Fill in the blank(s) with correct word
Quick Reply
