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Matter In Our Surroundings

Question
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A body starts initially with a velocity ‘u’ and is accelerated at constant rate ‘a’. Find an expression for final velocity after time ‘t’.

                                Or

Establish the relation: v = u + at.

Solution

First equation of motion:
Let a body start with initial velocity 'u' and after time t, its velocity becomes v due to uniform acceleration a.
From the definition of acceleration,
Acceleration space equals space fraction numerator Change space in space velocity over denominator Time space taken end fraction space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator Final space velocity space minus space Initial space velocity over denominator Time space taken end fraction rightwards double arrow space space space space space space space space space space space space space space space straight alpha space equals space fraction numerator straight v minus straight u over denominator straight t end fraction space space rightwards double arrow space space space space space space space space space space space space space space at space equals space straight v minus straight u rightwards double arrow space space space space space space space space space space space space space space space box enclose straight v space equals straight u space plus space at end enclose  

Some More Questions From Matter In Our Surroundings Chapter

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process

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