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Grade 12General Physics

1.If the error in the measurement of the momentum of a particle is (+100%). Then the error in the measurement of kinetic energy is:

(a) 400% (b) 300% (c) 100% (d) 200%

2.The lenght of a simple pendulum is about 100 cm known to have an accuracy of 1 mm. Its period of oscillation is 2 s determined by measuring the time for 100 oscillations using a clock of 0.1 s resolution. What is the accuracy in the determined value of g ?

(a) 0.2 % (b) 0.5 % (c) 0.1 % (d) 2 %

Profile image of hemanth c
16 Years agoGrade 12
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1 Answer

Profile image of Ramesh V
16 Years ago

(1) KE = 1/2 mv^2, where mv = p = momentum

KE = p2 / 2m

d(KE)/KE = 2d(p)/p

error in mesrmnt of KE = 2*100 % = 200%

option D

(2) time period is T = 2*pi*(l/g)1/2

g = 4*Pi*Pi*L/T2

log g = log C + log(L) - 2 log (T)

d(g)/g = d(L)/L  + 2 d(T)/T

          =  0.1/100 + 2*0.1/(2*100)

          = 2/1000 = 0.2%

--

regards

Ramesh



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