Work and Energy — Science STD 9 — Question

Write short note : Staistical Model

Why does this happen? (b) Fruits, flowers fall off after a certain period of time.

Write short note : Climate factors

Why do these articles not get spoilt during the summer or winter?

Give two uses of Blue vitriol.

A current of 0.24 A flows through a conductor when a potential difference of 24 V is applied between its two ends. What is its resistance?

Give the uses of Coke.

Give the uses of teflon.

Using the chart of ions/radicals and the cross-multiplication method, write the chemical formulae of the following compounds:
Copper sulphate

1. Take two aluminium channels of different lengths.
2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.

Questions
1. At the moment of releasing the balls, which energy do the balls have?
2. As the balls roll down which energy is converted into which other form of energy?
3. Why do the balls cover the same distance on rolling down?
4. What is the form of the eventual total energy of the balls?
5. Which law related to energy does the above activity demonstrate? Explain.