Introduction To Physics And Measurement - SS1 Physics Past Questions and Answers - page 4

Accuracy refers to how close a measured value is to the true or accepted value. It indicates the absence of systematic errors in the measurement. A measurement is considered accurate if it is close to the true value, regardless of the precision of the measurement.

Precision refers to the degree of consistency in a set of measurements. It reflects the ability to obtain the same or similar results repeatedly. A measurement is considered precise if repeated measurements yield similar results, even if they are not close to the true value.

Here's how to calculate the number of seconds in a two-day period: 1. **Seconds in a minute:** There are 60 seconds in 1 minute. 2. **Minutes in an hour:** There are 60 minutes in 1 hour. 3. **Hours in a day:** There are 24 hours in 1 day. 4. **Total seconds in a day:** 60 seconds/minute \* 60 minutes/hour \* 24 hours/day = 86,400 seconds/day 5. **Total seconds in two days:** 86,400 seconds/day \* 2 days = 172,800 seconds

Scientific notation (also known as standard form) is a way to express numbers in a concise and convenient form, especially when dealing with very large or very small numbers. It is expressed as a number between 1 and 10 multiplied by a power of 10.