21/33 A crane is lowering a 50 kg box. If the crane lowers the box at a

constant speed, what is the tension Fr in the cable?

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

What is friction? how does it affect the motion of an object?