A ballon when kept in sun, bursts after some time, why?

On end of a towel dips into a bucket full of water and the other end hange over the bucket. It is found after some time the towel becomes wet. It happens:

Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?

Heat is generated continuosly in an electric heater ,but its temperature becomes constant after some time.Why?

The shadow of a tower standing on a level ground is found to be 40m longer when the sun altitude is 30°, then when it is 60° . Find the height of the tower.

A plant cell when kept in a cetain solution got plasmolysed. What was the nature of the solution.

Explain why the setting sun looks red?