Systems of Particles and Rotational Motion — Physics STD 11 Science — Question

What do you mean by viscosity and terminal velocity?

A bird is sitting on the floor of a wire cage and the cage is in the hands of a boy. The bird starts flying in the cage. Will the boy experience any change in the weight of the cage?

When 40kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 10¹⁸Hz. Calculate the value of Planck constant from these data.

A disturbance pulse takes 0.2 second to travel across a long wire and return. Tension is created in the wire by continuously hanging a weight 100 times the total weight of the wire on a pulley. Find the total length of the wire. Here g = 9.8 m/s.

In measuring time period of a pendulum, it is advised to measure the time between consecutive passage through the mean position in the same direction. This is said to result in better accuracy than measuring time between consecutive passage through an extreme position. Explain.

A mass M₁ revolves around another mass M₂ in a path of radius r, what is the angular momentum associated with M₁?

What is calorimetry? What is the principle of calorimetry?

What are the changes force can bring on a body?

It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
Estimate the time required to flatten the drop.