Physics: Physical Quantities and Measurements II

Express the SI units of pressure is it's base form ______

Two forces, each of 10 N, act at a point P as shown. The angle between the directions of the forces is 120°.

What is the magnitude of the resultant force?

What is a typical value of the wavelength of a microwave travelling in a vacuum?

A double-slit interference experiment is used to determine the wavelength of light from a monochromatic source.

The following measurements are used.

slit separation a = 0.50 ± 0.02 mm

fringe separation x = 1.7 ± 0.1

distance between slits and screen D = 2.000 ± 0.002 m

Where wavelength = ax/D

What is the percentage uncertainty in the calculated wavelength?

In still air, a bird can fly at a speed of 10 m s–1. The wind is blowing from the east at 8.0 m s–1.

In which direction must the bird fly in order to travel to a destination that is due north of the bird’s current location?

Which pair of units are not the same when expressed in SI base units?

• N s and kg m s–1

• Pa and N m–2

• m s–2 and N kg–1

• V m–2 and N C–1

What is the vertical component of this displacement vector?

The units of specific heat capacity are J kg–1 K–1. What are the SI base units of specific heat capacity?

How many cubic nanometres, nm^3, are in a cubic micrometre, µm^3?