What happens when an object is dropped? a. its velocity at 2 seconds is 19.6 m/s. b. its velocity at 2 seconds is 9.8 m/s. c. its velocity at 2 seconds is 20 km/h. d. its velocity at 2 seconds is 22 mph.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

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?

How much work would it take to move a coulomb charge across a 4 volt potential difference?