EVALUATE

Name the principle on which the following instruments work: Water clock

Draw a well labelled diagram of a simple pendulum and define the term: Amplitude.

Write the formula to calculate this term.

In a flat, the lift takes $15 \mathrm{s}$ to go from ground floor to the fourth floor without stopping. If the height of each floor is $5 \mathrm{m}$, what is the average speed of the lift?

The bob of a simple pendulum takes $0.3 \mathrm{s}$ to go from one extreme position to the mean position. What is the time period?

Anushka was sitting on a swing. She asked Atharv to help her to swing. Atharv pulled the swing $50 \mathrm{cm}$ towards him and then left it. How much distance will the swing cover to complete one oscillation?

An object moves at $10 \mathrm{km}/\mathrm{h}$for $10$ minutes and then moves $15 \mathrm{km}/\mathrm{h}$ for$15$ minutes. Find:

Total distance travelled by the object

 Average speed of the object

The distance between the Earth and the Sun is $14,90,00,000 \mathrm{km}$. The speed of light is $3\times {10}^8 \mathrm{m}/\mathrm{s}$. The sun stops giving out light now, how much longer will we be able to see the Sun?

A train took $11.5 \mathrm{minutes}$ to travel $10 \mathrm{km}$ from station A to B. It stopped at station B for $30 \mathrm{seconds}$ then took another $24 \mathrm{minutes}$ to travel $20 \mathrm{km}$ from station B to C. What was the average speed of the train?