Measurement questions | form five Physics

State the law of dimensional analysis.

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UNSOLVED

If the speed ​ V of the transverse wave along a wire of tension, ​ T and mass, ​ m is given by . Apply dimensional analysis to check whether the given expression is correct or not.

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1. The force ‘F’ acting on an object of mass ‘m’, travelling at velocity ‘V’ in a circle of radius ‘r’ is given by; . If the measurements are recorded as: m =(3.5±0.1) kg, V = (20±1) m/s, r = (12.5±0.5) m; find the maximum possible;

1. Fractional error.
2. Percentage error in the measurement of force.

2. Show how you will record the reading of force, ‘F’, in part (a)

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(i) Define the term dimensions of a physical quantity.
(ii) Identify two uses of dimensional equations.

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(i) What is the basic requirement for a physical relation to be correct?
(ii) List two quantities whose dimension is [​ ML²​ ​T^-1​ ​ ].

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UNSOLVED