Question: The wheel of a carriage is 3 feet in diameter and makes 3 revolutions per second; how fast is the train going?
I'm gonna walk myself through this and hopefully I get it right...
Well for starters, the radius of the wheel is 1.5 feet. So the circumference is $1.5\cdot2\cdot\pi=3\pi$ feet. The wheel has three revolutions per second. So it is moving at $9\pi$ feet per second right?
Can you guys help me out?