Two persons do the same amount of work. The first person does it in 10s and the second in 20s. Find the ratio of the power usesd by the person to that by the second person.

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Solution

Time taken by person 'A '= 10 sec
time taken by person 'B '=20 sec
let, work done be ' x '
Power of person 'A '=work done / time taken
=(x / 10 )watt
Power of person 'B '=work done / time taken
=(x / 20)watt
Therefore of power delivered by first person to second = 2:1

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Two persons do the same amount of work. The first person does it in 10s and the second in 20s. Find the ratio of the power usesd by the person to that by the second person.

Time taken by person 'A '= 10 sectime taken by person 'B '=20 seclet, work done be ' x 'Power of person 'A '=work done / time taken=(x / 10 )wattPower of person 'B '=work done / time taken=(x / 20)wattTherefore of power delivered by first person to second = 2:1

Time taken by person 'A '= 10 sec
time taken by person 'B '=20 sec
let, work done be ' x '
Power of person 'A '=work done / time taken
=(x / 10 )watt
Power of person 'B '=work done / time taken
=(x / 20)watt
Therefore of power delivered by first person to second = 2:1