Q. 144.0( 29 Votes )

# A book with many printing errors contains four different formulas for the displacement y of a particle undergoing a certain periodic motion:

A. y = a sin 2 t/T

B. y = a sin vt

C. y = (a/T) sin t/a

D.

(a = maximum displacement of the particle, v = speed of the particle. T = time-period of motion). Rule out the wrong formulas on dimensional grounds.

Answer :

The dimensions of the quantities involved are:

y = M^{0}L^{1}T^{0}

a = M^{0}L^{1}T^{0}

T or t=T

A. correct

Explanation: t/T is unitless. Therefore, dimension of y should be the dimension of a which is true.

B. incorrect

Explanation: quantities inside the trigonometric expressions should be unitless but dimension of vt = M^{0}L^{1}T^{0} which is having unit of length and is therefore wrong.

C. incorrect

Explanation: quantities inside the trigonometric expressions should be unitless but dimension of t/a = M^{0}L^{-1}T^{1} which is having unit of time/length and is therefore wrong.

D. correct

Explanation: t/T is unitless. Therefore, dimension of y should be the dimension of a which is true.

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PREVIOUSA physical quantity P is related to four observables a, b, c and d as follows:The percentage errors of measurement in a, b, c and d are 1%, 3%, 4% and 2%, respectively. What is the percentage error in the quantity P? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result?NEXTA famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ mo of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:Guess where to put the missing c.

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