physics

posted by Anonymous

A rocket engine on a spacecraft of total mass 10,000kg ejected 1.4kg of hot gases every second at an average discontinuous speed of 240ms-1.
1- What was the force on the spacecraft?

2- What was the acceleration of the spacecraft?

3-If the engines were used for 30's, what was the impulse given to the spacecraft?

4- What was the change of velocity?

please help I've been thinking of how to solve it for an hour

  1. Damon

    force = rate of change of momentum

    change of momentum of vehicle + change of momentum of fuel = 0

    in one second:
    10,000 (change of vehicle speed) = 1.4*240 = 336 kg m/s
    so
    change of vehicle momentum per second =336 kg m/s^2 = Force (answer #1)

    acceleration = change of vehicle speed per second = 336*10^-4 =3.36*10^-2 m/s^2

    impulse = change of momentum in 30 seconds = Force * 30

    change of velocity = change of momentum / mass

  2. anonymus

    so for change of momentum = 336 divided by 10,000? @Damon

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