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# I couldn't solve these problems. Could you please help me solve them  in steps? Q1. If E,M,J and G respectively denote energy, mass, angular momentum and gravitational constant, Calculate the dimensions of EJ2 /M5G2 Q2. The frequency  of vibration of stretched string depends on its length L its mass per unit length m and the tension T in the string obtain dimensionally an expression for frequency . Q3. What is meant by significant figures .State the rules for counting the number of significant figures in a measured quantity? Q4. A physical quantity X is given by X = A2B3/CD , If the percentage errors of measurement in A,B,C and D are 4%,2%,3% and 1% respectively, then calculate the % error in X. Q5. If two resistors of resistance R1=(4 ± 0.5) and R2=(16 ± 0.5) are connected (1) In series and (2) Parallel . Find the equivalent resistance in each case with limits of % error. Q6. The length of a rod measured in an experiment was found to be 2.48m, 2.46, 2.50m and 2.48m and 2.49m, Find the average length , the absolute error in each observation and % error. Q7. A famous relation in physics relates moving mass m to the rest mass m0 of a particle in terms of its speed v and the speed of the light c. A boy recalls the relation almost correctly but forgets where to put the constant c. He writes: m = mo / (1 – v2)1/2 Guess where to put the missing c. Q8. A calorie is a unit of heat energy and it equals about4.2 J, where 1 J = 4.2 kgm2s-2. Suppose we employ a system of units in which the unit of mass equals α kg, the unit of length equals β m, the units of time is ϒ sec. show that a calorie has a magnitude 4.2 α-1 β-2 ϒ2 in terms of the new units. Q9. In the formula X = 3YZ2, X and Z have dimensions of capacitance and magnetic induction respectively, what are the dimensions of Y in MKS system? Q10. In an experiment, on the measurement of g using a simple pendulum the time period was measured with an accuracy of 0.2 % while the length was measured with accuracy of 0.5%. Calculate the percentage error in the value of g.

Asked by Sukrit Saha 1st June 2016, 11:24 AM

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Answered by Expert 2nd June 2016, 9:46 AM
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