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if two forces of the same magnitude F are acting at an angle of 120 degree with each other the magnitude of their resultant will be
1. If water is cooled from 50OC to -5OC, what is the temperature change on the Celsius, Fahrenheit and Rankine scales?
Imagine a special air filter placed in a window of a house. The tiny holes of the filter allow only air molecules moving faster than a certain speed to exit the house, and allow only air molecules moving slower than that speed to enter the house from the outside. Explain why such an air filter would cool the house, and why the second law of thermodynamics makes building such an air filter an impossible task.
A member of the Congress proposed a scheme to produce energy as follows. Water molecules (H2O are to be broken apart to produce hydrogen and oxygen. he hydrogen is then burned (that is, combined with oxygen), releasing the energy in the process. The only product of this combustion is water, so there is no pollution. In light of the second law of thermodynamics, what do you think of this energy producing scheme?
10 mol of N2 gas expands at constant temperature of 300 K from 2 L at 8 atm to 6 L at 4 atm. How much work is performed by the gas?
The specific heat capacity of copper metal is 0.38 J /K.g. Calculate
the temperature rise of a 100 g bar of copper when 250 J of heat are
transferred to it.
What is the change in entropy in converting 1.0 kg of ice at 0.0-degree celsius to 1.0 kg water at 0.0 degrees celsius?
A tap supplies water at 26 degree Celsius while another supplies water at 82 degree. If the man wishes to bath with water at 40 degrees, find the ratio of the mass of hot water to that of cold water
A cylindrical tank 2 meters in diameter, 3 meters high os full of oil. If the specific gravity of
oil is 0.9, what is the mass of oil in the tank
An awning facing south. Outside is white. Will less heat be radiated into house if inside of awning is white, or does color of inside of awning make any difference?
