Achild sits on the edge of a spinning merry-go-round that has a radius of 1.2 m. the child's speed is 5 m/s. what is the child's acceleration?

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?

Which statement best explains why the overall charge on an atom is zero?

What caused magnetic fields? what happens if you keep breaking a magnet in two until you reach a single atom?