Question

a block of mass 1 kg slides down on an inclined plane of inclination theta is equal to 30 degree find the work done by the weight of the blog as its size clothes 50 centimetre

Answer 1

Work done by the block is 2.45J.

We know that,

Work done (W) = F × x × cos θ

where F is the Force,

x is the displacement

and θ is the angle between force and displacement.

We know, Force = Mass × Acc. due to gravity

Mass of the block = 1kg

Acc. due to gravity = 9.8 m/s²

So, force = (1 × 9.8)N = 9.8N

Also, displacement (x) = 50cm = 0.5m                           [1cm = 0.01m]

θ = (90° - 30°) = 60°                                [Angle in a right angled traingle = 90°]

Putting their respective values, we get:

W = 9.8 × 0.5 × cos 60°

   = 2.45 N-m

   = 2.45J                                                 [1 N-m = 1J]

Answer 2

Answer:

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Explanation:

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