A lever has a mechanical advantage of 5. How large would a force need to be to lift a rock with a mass of 100 kg?

Which type of basaltic lava flow has a fairly smooth

What is the angular momentum of the bar about the axle?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?