Connect the circuit as shown above. Set the value of R= 30\(\Omega\). Close the key and obtain a balance at point T on the potentiometer wire PQ. Read and record the length TQ = L Evaluate L\(^{-1}\) and R\(^{-1}\), Repeat the experiment for R= 20, 10.5, 3 and 1\(\Omega\) respectively. In each case, determine and record the corresponding values of LL\(^{-1}\) and R\(^{-1}\). Remove the resistance box from the circuit and then determine the length L\(_{o}\) corresponding to R= 0. Tabulate your readings. Plot a graph at R\(_{1}\) on the vertical axis, and L\(^{-1}\) on the horizontal axis, starting both axes from the origin (0,0). Determine the slope, s of the graph and its intercept, I on the vertical axis.
Evaluate: (i) k = 1\(^{-1}\)
                (ii) \(\frac{Lo}{S}\)
State two precautions taken to ensure accurate result

(b)i. Using your graph, determine the value of L for which R =15\(\Omega\).

ii. if the intercept I = 0.5+ y\(^{-1}\), use your graph to determine the value of y.

iii. Explain what is meant by the e.m.f.of a cell.

The slope of the straight line displacement-time graph indicates?

A man will exert the greatest pressure when he?

Which of the units of the following physical quantities are derived?

I. Area
II. Thrust
III. Pressure
IV. Mass

A ball of mass 0.5kg moving at 10ms\(^{-1}\) collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.