Units, Physical Quantities and Measurements; Vectors

Front

What is the x-component of a vector A ⃗=3.0N at an angle of 150°?

Back

-2.6 N

Front

What is measurement?

Back

Measurement is the process of comparison between an unknown quantity and a standard.

Front

Which of the following is NOT the correct SI unit? temperature : degrees Celsius, mass : kg, length : m, time : s

Back

temperature : degrees Celsius

Front

What is a vector quantity? Give an example.

Back

A vector quantity has both magnitude and direction. Example: Velocity.

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measured value is to the true value, while precision refers to the degree of closeness of measured values to each other.

Front

What is the SI unit for mass?

Back

The SI unit for mass is kilogram (kg).

Front

What is the SI unit for length?

Back

The SI unit for length is meter (m).

Front

What is the SI unit for time?

Back

The SI unit for time is second (s).

Front

What is a scalar quantity? Give an example.

Back

A scalar quantity has only magnitude and no direction. Example: Mass.

Front

How do you calculate the x-component of a vector given its magnitude and angle?

Back

x-component = magnitude * cos(angle).