Thermal Properties of Matter — Physics STD 11 Science — Question

In which of the following examples of motion, can the body be considered approximately a point object: A spinning cricket ball that turns sharply on hitting the ground.

A bird is sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Will the girl experience any change in the weight of the cage when the bird

1. Starts flying in the cage with a constant velocity;
2. Flies upwards with acceleration.
3. Flies downwards with acceleration?

Why a tennis ball bounces higher on hills than on plains?

Why do we see the flash of lightning first and hear the thunder later?

Find the time required to liberate 1.0 litre of hydrogen at STP in an electrolytic cell by a current of 5.0A.

In Exercise, let us take the position of mass when the spring is unstreched as x = 0, and the direction from left to right as the positive direction of x-axis. Give x as a function of time t for the oscillating mass if at the moment we start the stopwatch (t = 0), the mass is: At the mean position. In what way do these functions for SHM differ from each other, in frequency, in amplitude or the initial phase?

Compare the direction of the magnetic field inside a solenoid with that of the field there if the solenoid is replaced by its equivalent combination of north pole and south pole.

If you have boiling water and cold milks for tea and you want to drink tea after some time, then to drink hot tea, should you add the milk at the same time or should you mix it just before drinking the tea, explain.