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According to our records you have not yet redeemed an access code for this class or purchased access online. The grace period will end Wednesday, January 24 2018 at 12:00 AM EST. Afte date you will no longer be able to see your WebAssign assignments or grades Get access now. (a) Find the tension in the string. (b) If the string can withstand a maximum tension of 0.180 N, what is the smallest value d can have before the string breaks? cm Need Help? LRead. + -/2 points SerCP11 15 P 005 The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons) (a) What is the force between the two alpha particles when they are 4.06 x 10-15 m apart? (b) What is the initial magnitude of the acceleration of the alpha particles due to this force? Note that the mass of an alpha particle is 4.0026 u. m/s2 Need Help? needle- 3:33 PM ENG 1/19/201 Type here to search

Explanation / Answer

According to the concept of the nuclear physices

Energy E=kqQ/d

force F=kqQ/d^2

given that

charge q=2e=2*1.6*10^-19=3.2*10^-19 C

charge Q=Ze=2*1.6*10^-19 =3.2*10^-19 C

now we find the force of attraction between two alpha paraticles

force F=9*10^9*3.2*3.2*10^-19*10^-19/(4.06*10^-15)^2=5.6*10^-8 N

now we find the initial acceleration of alpha paraticles

initial acceleration a=F/m=5.6*10^-8/(4.0026*1.66*10^-24))=0.843*10^16=8.43*10^15 m/s^2

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