Question

TIMED TIMED

An object travels in a circular path that has a diameter of 4 feet. The object makes 1,320 revolutions per hour. What is the linear velocity, in miles per hour, of this object

a. pi
b. 2pi
c. 5280 pi
d. 10560 pi

Answer 1

A

Explanation:

Answer 2

we know that
circumference=pi*D
where D is the diameter
diameter=4 ft
circumference=4*pi ft
if one revolution is -------------> 4*pi ft
1320 rev-------------> x
x=1320*4*pi-----> x=5280*pi ft/hout

convert ft to miles
1 mile-----------> 5280 ft
so
5280*pi ft----------> is pi mile
5280*pi ft/hour------> is equal to pi mile/hour

the answer is the option
a. pi