TEST OF PRACTICAL KNOWLEDGE QUESTION Using the spring balance provided, determine the weight of object of mass \(M = 5.0\text{g}\). Record this weight as \(...

TEST OF PRACTICAL KNOWLEDGE QUESTION

1. Using the spring balance provided, determine the weight of object of mass \(M = 5.0\text{g}\). Record this weight as \(W_{1}\).
2. Determine the weight of the object when completely immersed in water contained in a beaker as shown in the diagram. Record the weight as \(W_{2}\)
3. Determine the weight of the object when it is completely immersed in the liquid labelled 'L'. Record the weight as \(W_{3}\). Evaluate, \(u = (W_{1} - W_{3})\) and \(v = (W_{1} - W_{3})\).
4. Repeat the procedure with the objects of masses \(M = 10, 15, 20,\) and \(25\text{g}\). In each case, evaluate \(u = (W_{1} - W_{3})\) and \(v = (W_{1} - W_{3})\) on the vertical axis against \(u = (W_{1} - W_{2}\) on the horizontal axis.
5. Determine the slope, \(s\), of the graph. (vii) State two precautions taken to ensure accurate results.

(b)i. A piece of brass of mass \(20.0\text{g}\) is hung on a spring balance from a rigid support and completely immersed in kerosine of density \(8.0 \times 10^{2}\text{ kg m}^{-3}\). Determine the reading on the spring balance. \([g = 10\text{ms}^{-2}]\), density of brass = \(8.0 \times 10^{3}\text{ kg m}^{-3}\) J

ii. State Archimede's principle and the law of floatation.