Question

Question 1: Consider a metal rod of uniform temperature. Is it possible that heat spontaneously flow from one end of the rod to the other end so that they end up in different temperatures? Why?

Question 2: The ocean is full of heat energy. Explains what limits people from using this energy to make electricity?

Question 3: The density of water is about 1,000 kg/m³, and 1 mole of water molecules has a mass of 18 grams. Calculate the hidden kinetic energy in a cup of water at the room temperature.

Question 4: When you boil a cup of water at 100 C and make it all vapor, how much space does the water vapor occupy? What is the ratio of the volume of the water vapor to the liquid water?

Answer 1

1) It is not possible to a rod at the end because when spontaneously heat is supplied occurring the heat flow which only due to the temperature difference at the two points .It happens in starting but when the time goes or at the end equilibrium is achieved signifies no temperature difference at the end.

2) Generally the tidal energy ,thermal energy and the wave energy are present in the oceans .But many limitations are there to harvest the electricity.

For harnessing the thermal energy in order to produce the electricity the depth water and surface water difference should be 20°.

High dams are required for the tidal waves to obtain electricity.

In case of tidal energy , these waves depends on the relative position of the moon ,sun and the earth.

3)

Water boils when the vapour pressure ofyhe liquid becomes equal he atmosphere pressure.