The diameter of a barrel is 56cm. It is rolled over 2944cm. How many complete revolutions is needed?
I did this for you yesterday
http://www.jiskha.com/display.cgi?id=1472041460
Why are you repeating it?
btw, it should say "How many complete revolutions are needed?"
HEY.... Respect the question!!!!
To find the number of complete revolutions needed, we can apply the formula:
Number of revolutions = Distance traveled / Circumference
First, let's calculate the circumference of the barrel using the given diameter.
The formula for the circumference of a circle is:
Circumference = π * Diameter
Given:
Diameter = 56 cm
Plugging the values into the formula, we get:
Circumference = π * 56 cm
Now, let's calculate the circumference using an approximate value of π.
Taking π to be approximately 3.14, we can calculate the circumference as follows:
Circumference ≈ 3.14 * 56 cm
Circumference ≈ 175.84 cm
Now that we have the circumference, let's calculate the number of revolutions.
Given:
Distance traveled = 2944 cm
Number of revolutions = 2944 cm / 175.84 cm
Simplifying:
Number of revolutions ≈ 16.737 rev
Since we are dealing with a physical object that cannot have fractional revolutions, we need to round the answer to a whole number.
Therefore, the number of complete revolutions needed is approximately 17 revolutions.