A20 kg block slides to the left along a horizontal frictionless surface and hits an uncompressed spring of spring constant 810 n/m, which sends the mass back to the right with the same speed. for how long is the block in contact with the spring? a) 0.785 s b) 0.641 s c) 0.597 s d) 0.555 s e) 0.494 s

How are positive ions different from neutral atoms

Calculate the minimum energy required to remove one proton from the nucleus 126c. this is called the proton-removal energy. (hint: find the difference between the mass of a 126c nucleus and the mass of a proton plus the mass of the nucleus formed when a proton is removed from 126c.) express your answer with the appropriate units. emin e m i n = nothing nothing request answer part b how does the proton-removal energy for 126c compare to the binding energy per nucleon for 126c, calculated using eb=(zmh+nmn−azm)c2?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d