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Derive Planck’s law of black body radiation.
In a pipe that has a cross-sectional area of 0.5 m^2 and a flow rate of 1.5 m^3/s, what is the average speed of the fluid carried by the pipe? *
A man eats 3500 calories of food. How much work can he perform?
How much heat is required to change 200ml of ice at - 22°C into steam 100 °C
c)
For a given gas the coefficient of viscosity is 1.9 x 10 Nsm and the diffusion
coefficient is 1.2 x 10-5 m?s-. Calculate the density and mean free path at average
molecular velocity of 380 ms-1
A rectangular block of metal of mass 1500kg is 2m high and stands on a square base of side 0.5m.What is the area base?
1. Ammonia is polar molecule while boron trifluoride is a non polar molecule. Explain the difference in the polarity of these co pounds.
2. Suppose that AB3E a hypothetical moleculeis discovered . Predict whether the molecule is polar or nonpolar by determining its molecular shape.
Note : A- corresponds to central atom
B- Terminal atom
E-lone pair ( nonbonding electrons)
As a gasoline engine is running, an amount of gasoline containing 14,400 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,600 J of work.
Suppose that one early morning when the temperature is 10 degree Celcius, a driver of an automobile gets his gasoline tank which is made of steel filled with 75 litres of gasoline which is also at 10 degree celcius. during the day the temperature rises to 30 degree celcius. How much gasoline overflows?
AN IDEAL REFRIGERATOR REMOVES HEAT AT THE RATE OF 0.10KW FROM ITS INTERIOR (+2C) AND EXHAUSTS HEAT AT 40C. HOW MUCH ELECTRICAL POWER IS USED?
