Question

13.What is the work done in kilo joules in lifting a man of 10 kg through a vertical height of 10 m?​

Answer 1

Answer:

worked done = mgh

10*10= 100

Answer 2

$\huge\mathfrak\red{ANSWER}$

1KJ - 1 KILOJOULE

Explanation:

IMPORTANT KEYWORDS:

WORK IS SAID TO BE DONE WHEN FORCE A FORCE IS APPLIED ON A BODY AND THAT BODY UNDERGOES DISPLACEMENT

WORK IS ALSO THE PRODUCT OF FORCE APPLIED AND DISPLACEMENT.

S. I UNIT OF WORK IS JOULE.

1J = 1000KILOJOULE

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COMING TO QUESTION -

MASS OF MAN = 10Kg

DISPLACEMENT OF MAN = 10m (as he is lifted from ground) = S

ACCELERATION = g = 9.8m/s^2

F = ?

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IN THIS CASE:

WORK DONE = F × S

FORCE = m×a

SO FORCE APPLIED ON MAN

= 10×9.8

= 98NEWTON.

NOW, WORK DONE ON MAN

$98 \times 10$

$980joule$

SINCE 1KJ = 1000 JOULE

THEREFORE 980 JOULE = 1.0 KJ.

THUS THE WORK DONE IN LIFTING THE MAN UP IS 1KJ.

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BY SCIVIBHANSHU

THANK YOU

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