Question

D. Since the proton is moving while feeling a force, work is done on the proton: Won P = Felec Mlax Icoso, where lax is the magnitude of the proton's displacement and is the angle between the direction of that displacement straight to the left in this case) and the direction of the force on the proton. While the proton is approaching the nucleus the work done on it is positive, negative, zero). Important: our attention is now focused on something different from Question C. We are now thinking about Weep, the work done by the net force on the proton, not W, the work done by the net external force on the whole system. 2 We are imagining that the electric force is the only force on the proton, so it is the net force on the proton and W is the work done on the proton by this net force. We saw back in PHYS 2201 that the network done on one individual object, as opposed to the work done on a system is Won one thing = [AK, AU, AK+AU). Therefore, when the proton is moving toward the nucleus, its kinetic energy is [increasing, decreasing, remaining constant). E. In Question C you saw that the system's total energy, K+U, is [changing, constant and any constant value is possible), constant (and the constant value must be zero)] Therefore, the system's potential energy is [increasing, decreasing, constant]. This result can be generalized. Can you see what the general statement is? Whenever objects with the same type of charge get closer to each other, the system's electric potential energy will increase, decrease, remain constant).

Answer 1

force dice A) The broton feels a force from nuclers lowards right The nucles feels to broton towards left CAs both expel each other) (2) The magnitude of force from nucleus on the heaton is equal to the force from the proton on the nucleus. CAS Action = Reaction from Neutons med law of motion) B) magnetüche of prolon's acceleraton is greater than magnitude of nucleus's acceleration. Cas, for a constant force, acceleration is inversely proportional to mass) 4) be cause Nucleus chas much weaker acceleration than roton, it is reasonable to say Necleus's acceleration is essentially us. Zero acceleration means the objects speed constant of any value. mast be

5) therefore, we can imagine that we are looking at the system from a reference frame in which that constant value is zero , in that case all the kinetic energy of the system comes from PROTON.

B) as the proton gets closer to nucleus ,the magnitude of force on both proton and nuclear INCREASE, as the force is inversely proportional to the Square of distance between two interacting charges.