P1 units and dimensions

The following quantities are scalar, except for

• age of the earth

• density of mercury

• velocity of a snail

• thermal energy

• air pressure in a tire

Which of the following are derived quantities?

• light intensity of an LED lamp

• acceleration of a rotating object

• electric current in a wire

• water pressure at the bottom of a swimming pool

• surface temperature of the sun

If two vectors have the same magnitude/length, then the two vectors are said to be equal

• True

• False

Two vectors with magnitudes of 2 and 3, respectively, will have a resultant magnitude of 5.

• True

• False

John runs at a pace of 8 minutes/km, what is John's speed?

• 2.08 m/s

• 0.48 m/s

• 3.02 m/s

• 1.21 m/s

• 4.11 m/s

How many significant figures is 0.002020?

Two independent measurements: A = 2.0 ± 0.1 and B = 3.1 ± 0.2, determine the relative error of A×B

0.002100 x 1.0 =

• 0.002

• 0.0021

• 0.00210

• 0.002100

• 0.0021000