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Matter In Our Surroundings
Draw velocity-time graph for a body moving with uniform velocity. Hence show that the area under the velocity-time graph gives the distance travelled by the body in a given time interval.
Consider the figure as below.
Distance covered as area under the velocity-time graph.
In Fig., line PQ is the velocity-time graph of a body moving with a uniform velocity, OP = v.
Area of rectangle ABCD
= AD × AB = OP × AB
= v × (t2 – t1)
= Velocity x time
= Distance travelled in time interval (t2 – t1)
Hence, the area under the velocity-time graph gives the distance travelled by the body in the given time interval.
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Suggest a method to liquify atmospheric gases.
Convert the following temperatures to Kelvin scale.
35°C
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
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 ?
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