Work, Energy, and Power — Physics STD 11 Science — Question

When hot air rises up in the atmosphere why does its temperature at the top of the mountain become less than that at sea level?

Where does the centre of mass of a uniform triangular lamina lie?

A constant current i is passed through a resistor. Taking the temperature coefficient of resistance into account, indicate which of the plots shown in figure best represents the rate of  production of thermal energy in the resistor.

The temperature of the atmosphere at a high altitude is around 500^°C. Yet an animal there would freeze to death and not boil. Explain.

Can a physical quantity have dimensions but still have no units?

Energy possessed by a body by virtue of its position or configuration is known as ­________.

When a shaving brush is taken out of water its hairs cling together. Why?

Why water is used as an coolant in the radiator of cars?

Choose the correct alternative:
Acceleration due to gravity increases/ decreases with increasing depth (assume the earth to be a sphere of uniform density).

At what value of Reynolds number does the flow of fluid becomes disturbed?