Physics, asked by itzmeheartkiller, 2 months ago

A certain man A does 450 J of work in 5 s and another man B does 240 J of
work in 3 s.

(a) Who has more power?

(b) Find the ratio of the power delivered by A to that delivered by B.​

Answers

Answered by vigneshmsd007
0

Explanation:

power= work done/ time

power of 1st person= 450 J / 5s

= 90 J/s

power of 2nd person= 240 J/ 3s

= 80 J/s

a) 1st person has more power

b) 90:80 = 9:8

Answered by Anonymous
77

Answer:

Let's understand about power first!

It is common experience that different persons complete a given work in different times. A person doing work quickly is said to be stronger but a person who does some work in a longer time is said to be weaker. In this context, we define the term power, which is a measure of rate of doing work.

Power:

The power of a person/machine/system is defined as its rate of doing work.

If W work is done in the time t, then the power P is given as:

Power, P = Work, W/ Time, t

Let's come to question now...

As we are provided with the work and time of both men A and B. We will find the power of both men A and B separately and then compare them to find out who has more power. After that we will find out the ratio of their powers.

Let's find out...✧

a.)

➛ Work done by man A, W = 450 J

➛ Time taken, t = 5s

Power, P = Work, W/ Time, t

Putting the values in the formula, we have:

➛ P = 450/5

➛ P = 90 W

Power of man A = 90 W

➛ Work done by man A, W = 240 J

➛ Time taken, t = 5s

Power, P = Work, W/ Time, t

Putting the values in the formula, we have:

➛ P = 240/3

➛ P = 80 W

∴ Power of man B = 80 W

Comparing the powers of both we find that,

90 W > 80 W

Power of man A > Power of man B

Man A has more power.

b.)

➛ The ratio of the power delivered by A to that delivered by B = Power of man A/Power of man B

➛ The ratio of the power delivered by A to that delivered by B = 90/80

➛ The ratio of the power delivered by A to that delivered by B = 9/8

➛ The ratio of the power delivered by A to that delivered by B = 9:8

The ratio of the power delivered by A to that delivered by B is 9:8

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