Question

10. How much time will be required to perform 520 J of work at the rate of 20 W?
(a) 24s (b) 165 (c) 20 s (d) 26 s​

Answer 1

Required Answer :

The time required to perform 520 J of work at the rate of 20 W = 26 seconds.

Option → (d) 26 s

Given :

• Work done by the body = 520 J
• Power of the body = 20 W

To find :

• Time required to perform the work

Solution :

Here, in this question we are given the work and power of a body and we need to calculate the time required to perform the work. So, by applying the given values in the formula of power we will get our required answer.

Formula of power :

• P = W ÷ T

where,

• P denotes the power
• W denotes the work
• T denotes the time

Substituting the given values :

⇒ 20 = 520/t

⇒ t = 520/20

⇒ Cancelling by 2 :

⇒ t = 260/10

⇒ Cancelling the zeros :

⇒ t = 26

Therefore, the time required to perform the work = 26 seconds

Answer 2

Answer:

26 s

Explanation:

work done= w×s

520J=20 × s

520/20=s

s=26 s