Posted by **Zach ** on Tuesday, February 7, 2012 at 8:13pm.

When a 1150 kg space rocket lifts off of ground. How many joules of energy has been provided by its engine during the time in which it achieves a speed of 180 m/s.

- physics -
**bobpursley**, Tuesday, February 7, 2012 at 8:22pm
I don't see a solution here. Much of the energy of the lift is just providing a force mg which holds the rocket off the ground, not incuding an upward acceleration. So the time to accelerate, or the acceleration itself it critical.

You can ignore this, and compute

final KE: 1/2 mv^2

final PE= mgh=mg (v/2)*time

but you are still left with not knowing the time it took to get to v. Of course, the energy of the rocket provides final PE+final KE.

## Answer This Question

## Related Questions

- physics - A new SpaceX rocket is being tested and launches from the ground. The ...
- Physical - A toy rocket is launched vertically from ground level (y = 0 m), at ...
- Physics - A rocket is fired vertically with an upward acceleration of 30 m/s2. ...
- physics - A test rocket is launched vertically from ground level (y = 0 m), at ...
- Physics - A test rocket is launched vertically from ground level (y=0m), at time...
- physics - Help please ! been stuck on this for hours. A model rocket blasts off ...
- Physics - Energy Budget for a Rocket in Free Space: Recall the analysis of the ...
- Physics - Energy Budget for a Rocket in Free Space: Recall the analysis of the ...
- physics - A firework rocket is launched vertically from rest and loses 60% of ...
- physics - You have designed a rocket to be used to sample the local atmosphere ...

More Related Questions