Question

a man does 200J work in 10 seconds and a boy does 100Jwork in 4 seconds.find ratio and how used more power?

Answer 1

Man

Power=work/time

=200/10

=20W

Boy

Power=Work/time

=100/4

=25W

Boy used more power.

Now,ratio

power of man: power of boy

20:25

4:5

Answer 2

$\huge \bold{WORK}$

When a force is applied on a body and it makes body move, work is said to be done.

S. I unit of work is joules.

$\huge \bold{POWER}$

The rate of doing work is called power.

Its S .I unit is watt.

$\large \bold{FOR \: MAN}$

◼$\mathsf{Work = 200 J}$

◼$\mathsf{Time = 10 second}$

$\LARGE \boxed{ \mathsf{POWER = \frac{Work}{Time}}}$

$\mathsf{POWER = \dfrac{200}{10}}$

$\huge \boxed{ \mathsf{POWER =20 W}}$

$\large \bold{FOR \: BOY}$

◼$\mathsf{Work = 100 J}$

◼$\mathsf{Time = 4 second}$

$\LARGE \boxed{ \mathsf{POWER = \dfrac{Work}{Time}}}$

$\mathsf{POWER = \dfrac{100}{4}}$

$\huge \boxed{ \mathsf{POWER =25 W}}$

$\bold{RATIO \: OF \: THEIR \: POWERS}$

$\boxed{ \mathsf{\dfrac{POWER \:APPLIED\: BY \:MAN}{POWER \: APPLIED \: BY \: BOY}}}$

$\boxed{ \mathsf{\dfrac{POWER APPLIED\: BY \: MAN}{POWER \: APPLIED \: BY \: BOY} =\dfrac{20}{25}}}$

$\boxed{ \mathsf{\dfrac{POWER \: APPLIED \: BY \: MAN}{POWER \: APPLIED \: BY \: BOY} = \dfrac{4}{5}}}$

$\large \boxed{ \boxed{ \mathcal{ POWER \: APPLIED \: BY \: BOY \: WILL \: BE \: MORE}}}$