A small rocket with 15 kN thrust burns all of its 250 kg of fuel in 30 s. The mass of the rocket without any fuel is 120 kg. If the rocket starts floating at rest in space and burns all of its fuel, what maximum speed does the rocket reach

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

What happens in a global convection cell

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.