Question

can sombody tell me how 3×10 power 5 come and pls solve this

Answer 1

Hello Friend !

It's very simple ........

Just multiply 5000 W and 60 s .

You will get 300000 . 

This you can also write as 3 * $10^{5}$ 

Or if you still have any problem , then just expand  3 * $10^{5}$ 

You will get 3 * 100000 = 300000.

Hope this clears your doubt ! 

Answer 2

5000W x 60s = 300000Ws
=3 x 10 x 10x 10x 10 x 10
=3 x 10^5 J (Ws = J)