Question

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Answer 1

Answer:

Answer:

The work done by the moon when it revolves around the earth is zero because here displacement of moon and gravitational force of earth are perpendicular to each other.

i.e., Work done (W) =F×d×cosθ

where F = applied force

d = displacement of the body

θ = angle between the applied force and the displacement of the body

In the case of revolution of moon around the earth, θ is 90°. Thus, W=F×d×cos90°

 = F×d×0=0

So, the work done by the moon when it revolves around the earth is zero.

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Answer 2

Explanation:

➨ This question says that a box is pulled with a force of 25N to produce a displacement of 15m. Now the question says that if the angle between the force and displacement is 30° now we have to find the work done by the force!

{\bold{\sf{\underline{Given \: that}}}}

Giventhat

➨ 25N is the F which the box is pulled.

➨ It produced displacement of 15 m

➨ Angle between the displacement and the force = 30°

{\bold{\sf{\underline{To \: find}}}}

Tofind

➨ Work doned by the force.

{\bold{\sf{\underline{Solution}}}}

Solution

➨ Work doned by the force = 324.375 Joules

{\bold{\sf{\underline{Using \: concept}}}}

Usingconcept

➨ Formula to find work doned

{\bold{\sf{\underline{Using \: formula}}}}

Usingformula

➨ Work doned = Fs cosθ

{\bold{\sf{\underline{Also \: means \: or \: denote}}}}

Alsomeansordenote

➨ F denotes Force

➨ s denotes displacement

➨ The value of θ is 30°

{\bold{\sf{\underline{Full \: solution}}}}

Fullsolution

~ Finding work doned

➨ Work doned = Fs cosθ

➨ Work doned = Fs cos 30°

➨ Work doned = 25(15) × cos × 30°

➨ Work doned = 25× 15 × cos × 30°

➨ Work doned = 25 × 15 × √3/2

➨ Work doned = 375 × √3/2

Cancelling 375 by 2

➨ Work doned = 187.5 × √3

Converting √3 into decimals

➨ Work doned = 187.5 × 1.73

➨ Work doned = 324.375 Joules