Q. A wheel of  a cart is making 4 revolutions per second. If the diameter of the wheel is 84 cm, find its speed.    

Dear student,
Here is the solution of your asked query:
Diameter of wheel=84cmSo, radius of wheel=842=42cmThen circumference of wheel=2πr=2×227×42=264 cmAnd circumference of wheel=one revolution of wheelSo, 4 revolution of wheel=4×264cm=1056 cmSince wheel of cart is making 4 revolution per second, so speed of wheel=1056 cm/second
Regards

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