A man lifts a 20.0 kg bucket of concrete from the ground up to the top of a 30.0 m tall building. The bucket is initially at rest but is travelling at 4.0 m/s when it reaches the top of the building. How much work was done by the man in lifting the bucket/

What are atoms of the same element with varying number of neutrons

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.