7.2 Compound measures: speed, density and pressure — Practise

1. A car travels $210$ km in $3.5$ hours. Find its average speed.
2. A runner moves at $5.5$ m/s for $40$ seconds. Find the distance.
3. A train travels $96$ km at $80$ km/h. Find the time.
4. A metal block has mass $780$ g and volume $100$ cm$^3$. Find its density.
5. A liquid has density $1.2$ g/cm$^3$ and volume $250$ cm$^3$. Find its mass.
6. A force of $600$ N acts on an area of $0.2$ m$^2$. Find the pressure.
7. A pressure of $500$ Pa acts on an area of $0.4$ m$^2$. Find the force.
8. A cyclist travels $900$ m in $2$ minutes. Find the speed in m/s.
9. H H A substance has mass $1.8$ kg and volume $750$ cm$^3$. Find its density in g/cm$^3$.
10. A vehicle travels $150$ km in $2.5$ hours. State which calculation finds its speed, then work it out.