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For the following questions answer them individually
When a body slides down a surface inclined $$\theta$$ to horizontal, the acceleration (f) of the body is given by
If $$\sigma_1$$ and $$\sigma_2$$ be the major and minor tensile stresses, then maximum value of tangential stress is equal to
The pressure in the air space above an oil (sp. Gravity 0.7) surface in a tank is 0.1 kg/cm$$^2$$. The pressure at 5 m below theoil surface will be
The ratio of heat flow $$\frac{Q_1}{Q_2}$$ from two walls of same thickness having their thermal conductivities as $$K_1 = 2K_2$$ will be
A Carnot engine has an efficiency of 0.5. The COP ofrefrigerant working with the same temperature limit is
A refrigerator operates on a reverse Carnot eycle between 900 and 300 k. If heat at the rate of 3 kJ/s is extracted from the low temperature space, then the power required to drive the refrigerator
If V is the mean velocity of flow, then according to Darcy-Weisbach equation for pipe flow energy loss over a length of pipeline is proportional to
40% of incident radiant energy on the surface of a thermally transparent bodyis reflected back. Ifthe transmissivitiy of the body be 0.15, then the emissivity of surface is
