The nucleus of a 125xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. it has 54 protons and charge q=+54e(1 fm = 1 femtometer = 1×10−15m.) hint: treat the spherical nucleus as a point charge.

a) what is the electric force on a proton 9.0 fm from the surface of the nucleus?

express your answer in newtons.

b) what is the proton's acceleration?

express your answer in meters per second squared.

2) two 3.5-cm-diameter disks face each other, 2.0 mm apart. they are charged to ± 11 nc .

a) what is the electric field strength between the disks?

express your answer in newtons per coulomb.

b) 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?

Newton's law of cooling states that the rate of change in the temperature t(t) of a body is proportional to the difference between the temperature of the medium m(t) and the temperature of the body. that is, startfraction dt over dt endfraction equals upper k left bracket upper m left parenthesis t right parenthesis minus upper t left parenthesis t right parenthesis right bracket , where k is a constant. let kequals0.04 left parenthesis min right parenthesis superscript negative 1 and the temperature of the medium be constant, m(t) font size decreased by 3 equivalent font size decreased by 3 294 kelvins. if the body is initially at 369 kelvins, use euler's method with hequals0.1 min to approximate the temperature of the body after (a) 30 minutes and (b) 60 minutes.