Measurement & Units
What is nuclear physics?
Nuclear physics involves the study of the components, structure, and behavior of the nucleus of the atom. It has a number of practical applications in developing nuclear energy, archeological dating, smoke detectors and nuclear medicine.
What is accuracy?
This term describes how close a measurement is to the true or accepted value.
A rectangular box has a length of 8 cm, width of 3 cm, and height of 2 cm. What is its volume?
Answer: 48 cm³
The unit for liquid volume is the Liter. What is an associated instrument of measurement for liquid volume?
Measuring/Graduated Cylinder
What is density?
The measure of how much matter is in a given space. It is also a property that is found by dividing mass by volume.
What is the SI Unit for the physical quantity mass?
Kilogram (kg)
What is precision?
This term describes how close repeated measurements are to each other.
What piece of equipment is best used to measure the volume of a liquid accurately?
Answer: Graduated cylinder
What is the formula for the area of a triangle?
½ x b x h
What is the formula to calculate density?
Density = Mass / Volume
Density is what type of quantity? (Base or derived)
Derived
A student gets measurements of 10.1 cm, 10.2 cm, and 10.1 cm repeatedly. These measurements are said to be?
Precise
A solid object causes the water level in a graduated cylinder to rise from 40 mL to 58 mL. What is the volume of the object?
Answer: 18 mL or 18 cm³
A sheet of plywood is 250 cm long and 125 cm wide. What is the area of the sheet of plywood (in cm2)?
31,250 cm2
In an experiment to determine the density of copper, the student measured the mass and volume of a sample of copper.
The measurements were as follows:
Volume of copper = 119.5 m3
Mass of copper = 204.5 kg
What is the correct value of the density?
1.711 kg/m3
What physical quantity does the stopwatch measure?
Time
A scale shows the correct mass of an object. The measurement is considered?
Accurate
Find the volume of a cube with sides measuring 7 cm.
Answer: 343 cm³
Find the area of a circle with a radius of 8. Round to the nearest whole number.
201
A solid rectangular box has a length of 6 cm, a width of 4 cm, and a height of 5 cm. Work out the density of the box if the mass of the box is 150 grams.
1.25 g/cm3
In a biology lab, a student measures the heart rate of a subject at 80 beats per minute, while the accepted value is 74 beats per minute. Calculate the percent error in the heart rate measurement. (Round to two decimal places)
8.11%
Measurements that are both close to each other and close to the true value are described using these two terms.
Accurate and precise
A rectangular fish tank measures 25 cm × 12 cm × 10 cm. Calculate the volume in cubic centimetres.
Answer: 3000 cm³
Find the area of a triangle that has a height of 4m and a base of 3.5m, in scientific notation.
7.0 x 10^0 m2
A gas has a density of 0.4 g/L, and its volume is 20 liters. What is its mass?
8 grams