how to find how many ridges a 10 p coin has?
What do we measure and how do we work it out?
this is physics?
measure the circumference C of the coin
measure the distance D between two ridges
number of ridges = C/D
For example, if the coin is 5 cm around, and each ridge occupies 1 mm (.1 cm), then there are 5/.1 = 50 ridges.
You need to add one as there is one extra ridge compared to the number of spacings between ridges
To find out how many ridges a 10 pence coin has, you can measure its diameter and then count the number of ridges you can fit around the circumference of the coin. Here's how you can do it:
1. Obtain a ruler or caliper: Use a ruler or caliper to measure the diameter of the coin. The diameter is the distance across the widest part of the circle.
2. Measure the diameter: Place the ruler or caliper perpendicular to the coin and measure the distance from one side of the coin to the opposite side, passing through the center. Make sure to take accurate measurements in millimeters (mm).
3. Determine the circumference: Once you have the diameter, you can calculate the circumference of the coin using the formula: Circumference = π x Diameter.
4. Calculate the number of ridges: The ridges on a coin are usually grooves that go around the edge of the coin. Count the number of ridges you can fit along the circumference of the coin. It's common for a 10 pence coin in the UK to have 55 or 60 ridges, but this can vary slightly.
By following these steps, you can measure the diameter and calculate the number of ridges on a 10 pence coin.