Convection occurs because the oceanic waters heat up becoming less dense. This water moves above the cooler water, and give off its heat to the surrounding environment. As it cools, it begins to sink, and the process begins again.
Answer:

Explanation:
As we know that when we increase the temperature of the rod and the ruler then in that case there will be change in the length of the both.
Due to this the ruler measurement is different from actual length of the rod
So by thermal expansion we know that



Now for length of unit division of steel scale



now the measured length from the scale is given as




Answer:
0J
Explanation:
The kinetic energy would be zero. An object just released from rest will have no kinetic energy but the potential energy will be maximum.
Kinetic energy is the energy due to the motion of a body
Potential energy is the energy due to the position of a body.
- The kinetic energy at the start will therefore be zero
- All the energy is stored as potential energy.
Therefore, the kinetic energy is zero