A `4200` kg rocket is traveling in outer space with a velocity of `150` m/s toward the sun. It wishes to alter its course by `30^(@),` and can do this by shooting its rockets briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of `2700` m/s, what mass of gas must be explled ?

A car is travelling at a velocity of 10 m/s and has a mass of 850 kg. What is its kinetic energy?

A 3000 kg space probe is moving in a gravity free space at a constant velocity of 300 m//s . To change the direction of space probe, rockets have been fired in a direction perpendicular to the direction of initial motion of the space probe, the rocket firing exerts a thrust of 4000 N for 225 s . The space probe will turn by an angle of (neglect the mass of the rockets fired)

A 3000 kg space probe is moving in a gravity free space at a constant velocity of 300 m//s . To change the direction of space probe, rockets have been fired in a direction perpendicular to the direction of initial motion of the space probe, the rocket firing exerts a thrust of 4000 N for 225 s . The space probe will turn by an angle of (neglect the mass of the rockets fired)

A bullet of mass 50g is fired with an velocity of 150m//s . If the rifle weights 3kg . What is its recoil velocity?

A 2000 kg rocket in free space expels 0.5 kg of gas per second at exhaust velocity "400 m s"^(-1) for 5 s. The increase in the speed of the rocket in this time is

A 2000 kg rocket in free space expels 0.5 kg of gas per second at exhaust velocity "400 m s"^(-1) for 5 s. The increase in the speed of the rocket in this time is

A rocket is going away from the earth at a speed of 10^(6) m/s. If the wavelength of the light wave emited by it be 5700 Å, what will be its Dopper,s shift

A rocket is going away from the earth at a speed of 10^(6) m/s . If the wavelength of the light wave emitted by a light source on it is 5400 Å , what will be its Doppler Shift ?

A ball of mass of 150g and velocity 12 m/s coming towards a batsman is hit by him with a force in such a way that the ball moves with velocity 20 m/s in the direction opposite to its original one. The time of contact between the ball and the bat is 0.01 s. Then the force applied on it by the batsman i s .....