A string is wound 30 times around a cylindrical object of diameter 7m. calculate the length of the string.(Take pi =22/7).
A string 30tins around a cylinder object of diameter 7m .calculate the length of the tin string
22/7×7=22
Actually, 22/7 x 7 = 22 which is the circumference of the cylinder.
To calculate the length of the string wound around the cylinder, we need to multiply the circumference by the number of times the string is wound around the cylinder.
So, the total length of the string would be:
22 x 30 = 660 meters
Therefore, the length of the tin string is 660 meters.
To calculate the length of the string wound around the cylindrical object, we need to determine the circumference of the cylinder.
The formula for the circumference (C) of a cylinder is given by: C = π * diameter
Given that the diameter (d) is 7 meters, we can substitute this value into the formula:
C = (22/7) * 7
C = 22 meters
Now, we know the string is wrapped around the cylinder 30 times. Therefore, we need to multiply the circumference by the number of times it is wound:
Length of string = Number of turns * Circumference
Length of string = 30 * 22
Length of string = 660 meters
So, the length of the string wound around the cylindrical object is 660 meters.
210
One perimeter = 2πr = 7π m
so 30 of them would be 30(7π) m = .... m
(nobody uses 22/7 for π anymore since scientific calculators were invented 48 years ago)