# If my rocket has two rocket engines going off each at an impulse at 20.00 N/S .

1. Mar 2, 2009

### Max CR

If my rocket has two rocket engines going off each at an impulse at 20.00 N/S.....

If my rocket has two rocket engines going off each at an impulse at 20.00 N/S, then would the total amount of impulse my rocket has be 40.00 N/S?

Please answer seriosuly only this is extremely important and anybody guessing can throw off my calculation and cause the rocket to steer into a house

2. Mar 2, 2009

### northern expo

first thing i would look at is the aspect of net forces applied to a mass. newton's second law f = m.a we note that the net force is directly proportional to the mass therefore the net force may be affected.

m.a = fa + ff

ok, now lets look at impulse. the real question is will the time value for this force applied remain? fnet = f. ∆t will this change or will the increased mass change the ∆t?

i may not have answered directly but hopefully gave you something to consider.

3. Mar 2, 2009

### Max CR

Is that a YES or a NO????

4. Mar 2, 2009

### northern expo

i believe the sum of the forces applied will compensate the resultant impulse.

m.a = (20 + 40) + (fg + air resistance)

therefore the increased impulse is directly proportional to the increased mass.

yes!!!!!!!!!