Motion in a Straight Line — Physics STD 11 Science — Question

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the:
Change in kinetic energy of the body in 10s.

Give an example of negative work.

1kg of ice at 0°C is mixed with 1kg of steam at 100°C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 10³ J kg^-1 and latent heat of vaporization of water = 2.26 × 10⁶ J kg^-1.

Is energy produced when a transformer steps up the voltage?

What is cooling curve? What is its shape?

Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden?

What is the specific heat of a gas in an isothermal process and in an adiabatic process?

Can we have physical quantities having magnitude and direction which are not vectors?

A photographic plate is placed directly in front of a small diffused source in the shape of a circular disc. It takes 12s to get a good exposure. If the source is rotated by 60° about one of its diameters, the time needed to getthe same exposure will be:

1. 6s
2. 12s
3. 24s
4. 48s.

Which of the following examples represent periodic motion?
A freely suspended bar magnet displaced from its N-S direction and released.