Roja swathi please explain

how to attend the motion of train problems.

Que problems1-a train 280 mts long is running at a speed of 42km/hr.How much time will it take to pass a man standing on a platform.

Que problem 2 a train 350 mtrs long crosses an electric pole in 28 secs. find the speed of the train in km/hr

please explain clearly because i am a slow understander.

I want  complete notes on the chapter friction 

In my book subtopics are:

Friction 

Types of friction 

Factors affecting friction 

Methods of reducing friction 

Methods of increasing friction 

Advantages and disadvantages of friction 

Some real life based situation where friction is applied.

How to make a monomer into polymer if it is an addition polymer example

This planet, _______ is yellowish in colour and has many rings and satellites.

A. Uranus

B. Jupiter

C. Neptune

D. Saturn

Pasteurized milk does not need to be boiled. Why?

Write the $pH$ value of the

1. Saliva (before meal)

2. Saliva (after meal)

3. Lemon juice

4. Colourless aerated drink

5. Carrot juice

6. Coffee

7. Tomato juice

8. Tap water