Question

What is the average speed in meter/sec, if an extrusion press has a crank radius of 20 cm and 30 rpm?

Answer 1

radius of crank of extrusion press , R = 20cm = 0.2 m

angular velocity, $\omega$ = 30rpm

= 30 × 2π/60 = π rad/ sec

[ note : rpm means revolution per minute, 1rpm = 2π/60 rad/s ]

now, average speed = angular velocity × radius of crank

= π × 0.2

= 0.2 × 3.14 = 0.628 m/s

hence, average speed in metre/second = 0.628 m/s

Answer 2

Thanks for the question!

It is definitely a very interesting question to solve and do some brainstorming.

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Given, radius (R) of crank of extrusion press , R = 20cm = 0.2 m

angular velocity = 30rpm

= 30 × 2π/60 = π rad/ sec

As we know,  rpm is revolution per minute,

1rpm = 2π/60 rad/s

Also, Average speed = angular velocity × radius of crank

= π × 0.2

= 0.2 × 3.14 = 0.628 m/s

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Hope it helps and solves your query!!