A toy rocket of mass 0.1 kg hass a small fuel of mass 0.02 kg, which it burns out in 3s. Starting from rest on a horizontal smooth track, it gets a speed of `20ms^(-1)` after the fuel is burnt out. What is the approcimate thrust of the rocket ? What is the energy content per unit mass of the fuel ? (Ignore the small mass variation of teh rocket during fuel burning).

A toy rocket having mass 0.2 has a small fuel of mass 0.04 kg which it burna out in 6 s. Starting from rest on a horizontal smooth track , it gets a speed of 40 m/s after the fuel is burnt out completey . What will be the approximate thrust of the rocket ? What is the energy content per unit mass of the fuel ? (Ignore the small mass variation of the rocket during fuel burning )

The energy released per unit mass of the fuel in fusion is .............. than that produced in fission.

A rocket of mass 1000 kg exhausts gases at a rate of 4 kg /sec with a velocity 3000 m//s . The thrust developed on the rocket is

A rocket motor consumes 100 kg of fuel per second exhausting it with a speed of 6 xx 10^(3) ms^(-1) What thrust is exerted on the rocket ? What will be the velocity of the rocket at the instant its mass is reduced to (1 // 40) of its initial mass ? Take initial velocity of rocket as zero . Neglect gravity .

A bullet of mass 0.01 kg and travelling at a speed of 500 ms^(-1) strikes a block of mass 2 kg which is suspended by a string of length 5 m . The centre of gravity of the block is found to raise a vertical distance of 0.2 m . What is the speed of the bullet after it emerges from the block?

The rate of mass of the gas emitted from the rear of a rocket is initially 0.1 kg//s . If the speed of the gas relative to the rocket is 50 m//s and the mass of the rocket is 2 kg , then the acceleration of the rocket in m//s^(2) is