1. Bronze is made by mixing molten copper and tin. If 100kg of the mixture contains 80% by mass of copper and 20% by mass of tin, calculate the density of bronze. (density of copper is 8900kgm
and density of tin is 700kgm?
(4mks
2. An astronaut weighs 900N on earth. On the moon, he weighs 150N. calculate the moon's
gravitational strength
(4mks
3. A spring stretches by 6cm when supporting a load of 15N. what load would make the spring
extend by 25mm
(4mks
A force of 100N is applied to an area of 100mm? What is the pressure exerted on the area in SI
units?
(4mks