Measurements and Experimentation — PHYSICS STD 9 — Question

The table below shows the distance travelled by two vehicles A and B during each second :

Time (s)	0	1	2	3	4	5	6	7
Distance travelled by A (m)	0	20	80	180	240	300	360	420
Distance travelled by B (m)	0	10	40	90	160	250	360	490

Give the value of the velocity at which they are meeting

Name two substances which expand on heating.

The lighting and the thunder are produced simultaneously, but the sound of the thunder is heard a few seconds after the lightning is seen. Why?

What do you mean by the point of incidence?

Define the following terms with reference to a simple pendulum:

Time period

Write the relation between g and G

Name two liquid thermometers that are commonly used.

'The resistance of a wire is 2 ohm'. Explain the meaning of this statement.