The separation of two atoms in a crystal is $3.8 \times 10^{-10}\,\text{m}$. State this separation in $\text{pm}$.
Calculate the length of one day in $\text{Ms}$.
The distance from the Earth to the Sun is $0.15\,\text{Tm}$. Calculate the time in minutes taken for light to travel from the Sun to the Earth.
Underline every vector quantity in the list below: distance, energy, momentum, weight, work.
Fig. 1.1 shows, to scale, the velocity vector diagram for an aircraft travelling due north. A wind is blowing from the north-west. The wind speed is $36\,\text{m s}^{-1}$ and the aircraft speed is $250\,\text{m s}^{-1}$. Draw an arrow on Fig. 1.1 to indicate the direction of the aircraft’s resultant velocity.
Determine the magnitude of the aircraft’s resultant velocity.