An object has a force of 80 N acting upon it accelerates at 12.3 m/s. What is the mass of the object?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Idon’t quite understand this problem