Atoms and Molecules — Science STD 9 — Question

In the following case, net force acting is zero? Also, identify the direction of force when.
A person pushes a door to hold it shut.

Which organelles constitutes the network of complex cellular membrane system in living cells?

State two characteristics of matter demonstrated by:
Brownian motion.

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

What is the major difference between a solution and an ordinary mixture?

20g of sodium chloride is dissolved in 100mL of water. How will you test whether the given solution is saturated or unsaturated at the given temperature?

Mention the factors affecting stored grains and describe their preventive measures.

A trolley, while going down an inclined plane, has an acceleration of 2cm s^-2. What will be its velocity 3 s after the start?

The flash of a gun is seen by a man 3 seconds before the sound is heared. Calculate the distance of the gun from the man (Speed of sound in air is 332m/s).