Momentum Homework Help Plz.
1)A rocket of 2*10^5KG is initially stationary.It lifts of a ground and after 10s it is travelling at a velocity of 50ms-1.The mass is constant !
A)Calculate the impulse of the force on the rocket.
B)Calculate the resultant force acting on the rocket.
For A I've done F=(Mv-Mu)/t= 1*10^6N then P=FT which is 1*10^7NS
that correct ?
For B Ive got 1000000N
A)Calculate the impulse of the force on the rocket.
B)Calculate the resultant force acting on the rocket.
For A I've done F=(Mv-Mu)/t= 1*10^6N then P=FT which is 1*10^7NS
that correct ?
For B Ive got 1000000N
They are correct but the 1st one can be calculated more easily by remembering that impulse = change in momentum
The momentum goes from zero to mv so the change is just mv an you have m and the final v.
Force is rate of change of momentum so just divide your answer by t (10s) to find it.
The momentum goes from zero to mv so the change is just mv an you have m and the final v.
Force is rate of change of momentum so just divide your answer by t (10s) to find it.
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