Q. Far in space, where gravity is negligible, a 495 rocket traveling at 55.0 fires its engines. The figure shows the thrust force as a function of time. The mass lost by the rocket during these 30 s is negligible. What impulse does the engine impart to the rocket?

Q. A 3.00 meter long 200kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 60.0 worker stands on the far end of the beam. What is the magnitude of the torque about the point where the beam is bolted into place. Note that for uniform objects like a beam, you can treat the mass as if it is located at the 'center of mass' of the object which here would be right in the center of the beam.