A geologist measures the weight of an irregular specimen of basalt rock as 150 N150\text{ N}150 N.
Name a piece of equipment they could use to measure the weight.
State the equation relating weight, mass, and gravitational field strength (ggg).
Calculate the mass of the basalt specimen. (Take g=10 N/kgg = 10\text{ N/kg}g=10 N/kg)
Describe how the geologist could find the density of the irregular basalt specimen. You should include details of any further measurements they would need to make.
A small paintball marker is mounted on a low-friction air-track glider, which is initially at rest, as shown in the diagram below.
Using ideas about momentum, explain why the glider moves in the opposite direction to the paintball when fired.
