A block is moving the rim of a pulley which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s and its diameter is 20 cm, then speed of the block at same instant is

2 m/s

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0.2 m/s

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20 m/s

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0.02 m/s

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Solution

The correct option is A 2 m/s
The pulley is moving at $ω$ = 10 rad/s

The radius of the pulley = 20 cm

Therefore linear velocity on the rim = tangential velocity = $r ω$

= 2 m/s.

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A block is moving the rim of a pulley which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s and its diameter is 20 cm, then speed of the block at same instant is

The correct option is A 2 m/s The pulley is moving at ω = 10 rad/s The radius of the pulley = 20 cm Therefore linear velocity on the rim = tangential velocity = rω = 2 m/s.

The correct option is A 2 m/s
The pulley is moving at $ω$ = 10 rad/s

The radius of the pulley = 20 cm

Therefore linear velocity on the rim = tangential velocity = $r ω$

= 2 m/s.