A200g block on a 50cm long string swings in a circle, it's frictionless and 75rpm. what is its speed and tension on string

The speed of the block is given by:

Where,

w: angular speed

r: radius of the circular path.

The angular velocity must be in radians over seconds:

The radius must be in the subway:

Then, the speed is given by:

The tension of the rope is the centripetal force.

By definition, the centripetal force is:

Where,

m: mass of the block in kilograms

Substituting values:

its speed and tension on string are:

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that would be because of both gravity and friction. so     c