What is the magnitude of its linear momentum? Express your answer using two sign

Question

What is the magnitude of its linear momentum? Express your answer using two significant figures. Multiconcept Exercise 19.60 A proton enters a uniform magnetic field that is at a right angle to its velocity. The field strength is 0.70 T and the proton follows a circular path with a radius of 4.9 cm g m/s Submit My Answers Give Up Part B What is its kinetic energy? Express your answer using two significant figures Submit My Answers Give Up Part C If its speed were doubled, what would then be the radius? doubling the speed would double the radius doubling the speed would decrease the radius by a factor of 2 doubling the speed would increase the radius by a factor of 4 Submit My Answers Give Up Part D What would be the momentum? doubling the speed would increase the momentum by a factor of 4 doubling the speed would double the momentum O doubling the speed would decrease the momentum by a factor of 4 Submit My Answers Give Up Part E What would be the kinetic energy? doubling the speed would increase the kinetic energy by a factor of 4 doubling the speed would double the kinetic energy doubling the speed would decrease the kinetic energy by a factor of 4 O Submit My Answers Give Up

Explanation / Answer

A] Magnetic force will provide centripetal force.

qvB = mv^2/r

mv = qBr = 1.6e-19*0.70*4.9e-2

momentum p = mv = 5.5*10^-21 kg m/s

B] KE = 0.5mv^2 = 0.5p^2/m = 0.5*5.488e-21^2/1.67e-27 =  9.0*10^-15 J

c] radius will be doubled, first option is correct because mv = qBr

d] momentum will be doubled, second option because p = mv

e] KE will become 4 times, first option is correct, because KE=0.5mv^2

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