Waves — Physics STD 11 Science — Question

A steam engine intakes steam at 200°C and after doing work exhausts it directly in air at 100°C. Calculate the percentage of heat used for doing work. Assume the engine to be an ideal engine.

Consider a pair of identical pendulums, which oscillate with equal amplitude independently such that when one pendulum is at its extreme position making an angle of 2° to the right with the vertical, the other pendulum makes an angle of 1° to the left of the vertical. What is the phase difference between the pendulums?

Derive the law of conservation of liner momentum from Newton's third law of motion.

An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?

The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5mm, calculate the minimum inaccuracy in the measurement of distance.

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

The difference between length of a certain brass rod and that of a steel rod is claimed to be constant at all temperatures. Is this possible?

It is a common observation that rain clouds can be at about a kilometre altitude above the ground.

A typical rain drop is about 4mm diameter. Momentum is mass x speed in magnitude. Estimate its momentum when it hits ground.