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sineoko [7]
3 years ago
5

A 5.0 g coin is placed 15 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the t

urntable surface of μs = 0.70 and μk = 0.50. The turntable very slowly speeds up.
Physics
1 answer:
Kaylis [27]3 years ago
7 0

Answer:

Angular speed will reach 6.833rad/s before the coin starts slipping

Explanation:

There is no question but I'll asume the common one: Calculate the speed of the turntable before the coin starts slipping.

With a sum of forces:

Ff = m*a

Ff=m*V^2/R

At this point, friction force is maximum, so:

\mu*N=m*V^2/R

\mu*m*g=m*V^2/R

Solving for V:

V=\sqrt{\mu*g*R}

V=1.025 m/s

The angular speed of the turntable will be:

ω = V/R = 6.833 rad/s   This is the maximum speed it can reach before the coin starts slipping.

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