The mass of helium gas in a balloon is . the weight of the gas minus the balloon
the amount of matter inside the balloon
the amount of matter including the balloon
the mass of helium minus the mass of the balloon

Assuming weightless pulleys and 100% efficiency, what is the minimum input force required to lift a 120 n weight using a single fixed pulley?

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

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.