Answer the following questions: 1. Write the names of two materials, matter and substances each.
2. Give two examples of homopolymers.
3. What is the full form of PVC? Give one property of it.
4. What is nylon? Give one example.
5. Give the names of blended fibre of terylene with cotton and wool.
6 What is orlon? Name the compound from which it is produced
7. Give one example each of low density polythene and high density polythene.
8. From which synthetic polymer thermocol is obtained? Name it
9. Name the synthetic polymer from which handles of pressure cooker and unbreakable crockery is made
10. What is araldite?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.