You are provided with unknown mass “m”, a knife edge, 50 g mass, 100 g mass, and a metre rule. Perform experiment through the following procedures: (a) Find and mark the centre of gravity C of the metre rule AB by balancing it freely on a knife edge. (b) Place a metre rule on a knife edge at its centre of gravity C. (c) Suspend the 100 g mass at point x=10 cm from the centre of gravity of a metre rule. Suspend 50 g mass at distance a =5 cm from C on the other side of C. (d) Suspend the mass m to the side of 50 g mass and adjust it until the metre rule balances horizontally as shown in the following Figure. (e) Repeat the procedure in 1 (d) when x =15 cm, 25 cm and 30 cm. Find the corresponding value of y (cm) in each experiment. Answer the following questions: (i) Tabulate the results of x (cm) and y (cm). (ii) Plot a graph of x (cm) against y (cm). (iii) Calculate the slope of the graph. (iv) Formulate the equation of the graph. (v) Determine the unknown mass m.

1. Tabulate the results of x (cm) and y (cm). (4 alama)
2. Plot a graph of x (cm) against y (cm). (6 alama)
3. Calculate the slope of the graph. (5 alama)
4. Formulate the equation of the graph. (4 alama)
5. Determine the unknown mass m. (6 alama)

Boresha ili kuona majibu ya mfano.

Determine the e.m.f of the cell and the resistance of a given piece of wire through the following procedures: (a) Connect the circuit diagram as shown below in which E is a battery, K is a key, L is the length of the wire, R is the resistance box and A is an ammeter. (b) With L = 12 cm and R set at 1 , record the ammeter reading I (A). (c) Without altering the value of L, repeat the procedure in 2 (b) with R = 2 Ω, 3 Ω, 4 Ω and 5 Ω. Record the corresponding values of ammeter reading in each case. (i) Tabulate the results of R, I and . I (ii) Plot a graph of against R. I (iii) Calculate the slope S of the graph. (iv) Find the value of I for which R = 0. 91 (v) Determine the e.m.f and resistance of the wire L given that, the internal resistance of the cell was 1.0 Ω. Show clearly how to arrive to the answers.

1. Tabulate the results of R, I and 1/I. (4 alama)
2. Plot a graph of 1/I against R. (6 alama)
3. Calculate the slope S of the graph. (5 alama)
4. Find the value of I for which R = 0. (2 alama)
5. Determine the e.m.f and resistance of the wire L given that, the internal resistance of the cell was 1.0 Ω. Show clearly how to arrive to the answers. (8 alama)

Boresha ili kuona majibu ya mfano.