Thermal Properties of Matter — Physics STD 11 Science — Question

How is the motion of parachute different from a stone dropped from certain height?

In a TV tube, electrons are accelerated from the rear to the front. What is the direction of the current?

Does the escape velocity vary with mass?

If a cube is melted and is casted into a sphere, does moment of inertia about an axis through centre of mass increases or decreases.

Why the speed of a whirl wind in a tornado is alarmingly high?

Why does a player run some distance before jumping?

In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. Does this violate conservation of momentu?

At which points of trajectory speed will be minimum and maximum?

What type of energy stored in:

1. The wound spring of a watch.
2. A stretched bow while ready to project an arrow?

A particle executing simple harmonic motion comes to rest at the extreme positions. Is the resultant force on the particle zero at these positions according to Newton's first law?