Physics: a disk of a radius 50 cm rotates at a constant rate of 100 rpm. what distance in meters will a point on the outside rim travel during 30 seconds of rotation?

a disk of a radius 50 cm rotates at a constant rate

lol9691

08.05.2021

Distance travelled in one round will be equal to the circumference of the disc i.e $2 \pi r$

Radius=50cm

Circumference= $2 \times \frac{22}{7} \times 50cm= \frac{2200}{7} cm$

If the disc rotates at speed of 100rpm that means it completes 100 rotation in a minute(60 second)

So, in 30 seconds it will complete 50 rotation.

1 rotation = $\frac{2200}{7} cm$

$50 rotation=\frac{2200}{7} \times 50cm \\\\ \frac{110000}{7} cm$

Break it in decimal.

Your answer will be 15714.2 cm

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donaji1024perez

09.04.2023

The answer is C

Explanation:

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