Question

A grinding wheel has a radius of 100mm and rotates at 30 rev/s.What is the grinding speed at the circumference

Answer 1

Step-by-step explanation:

circum.= 2 pi r

r= 100mm = 10cm

circum= 2×3.14×10

= 62.8 cm

1rev = 62.8 cm

so , speed = 30 1 rev / sec

= 30 × 62.8 / sec

= 1884cm/ sec