Physics
Units and Measurement
Significant Digits
11
⚡ Quick Summary
Significant digits are the digits in a number that are known with certainty plus one uncertain digit. They tell us how precise a measurement is.
N/A
- All non-zero digits are significant.
- Zeros between non-zero digits are significant.
- Leading zeros are not significant.
- Trailing zeros after the decimal point are significant.
- Trailing zeros in a whole number with no decimal point may or may not be significant. Use scientific notation to clarify.
Rounding Off
11
⚡ Quick Summary
Rounding off means reducing the number of digits in a number while keeping it as close as possible to the original number. It's about making numbers simpler to work with without losing too much accuracy.
N/A
- If the digit to be dropped is less than 5, the preceding digit is left unchanged.
- If the digit to be dropped is greater than 5, the preceding digit is increased by 1.
- If the digit to be dropped is 5, then
- if the preceding digit is even, it's left unchanged
- if the preceding digit is odd, it's increased by 1
Volume of Cylinder
11
⚡ Quick Summary
The volume of a cylinder is the area of the circular base times the height. It basically tells you how much space the cylinder occupies.
Volume = πr²h
- Volume is given by the formula: Volume = πr²h, where r is radius, h is height
Average Thickness
11
⚡ Quick Summary
The average thickness is the sum of all thickness measurements divided by the number of measurements. A fancy word for mean
Average = (measurement1 + measurement2 + ... measurementN) / N
- Average is given by the formula: Average = (measurement1 + measurement2 + ... measurementN) / N