Ten questions. The result tells you which lessons you may skip.
The wavelength of green light is \(0.000\,000\,55\,\text{m}\). In scientific notation this is
The radius of the Earth is \(6.4 \times 10^6\,\text{m}\). Its order of magnitude is
What is \((3 \times 10^4) \times (2 \times 10^{-6})\)?
How many significant figures does \(0.0250\,\text{kg}\) have?
A reactor makes \(1000\,\text{MW}\) of heat, and each fission gives \(3.2 \times 10^{-11}\,\text{J}\). Roughly how much uranium-235 does it use in a day?
A car moves at \(90\,\text{km/h}\). In metres per second this is
One unit on an electricity bill, \(1\,\text{kWh}\), is
The dimensions of pressure are
Which equation must be wrong? Here \(s\) is a displacement, \(u\) and \(v\) speeds, \(a\) an acceleration and \(t\) a time.
Dimensional analysis gives the period of a simple pendulum as \(T = k\sqrt{l/g}\). If the length is made four times as large, the period