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Matter In Our Surroundings
When a body is moving with a uniform speed, its speed-time graph is a straight line parallel to time-axis.
In Fig. below, the line AB represents the speed-time graph of a body moving with a uniform speed of 4 m/s, while line A'B' represents the speed-time graph of a body moving with uniform speed of 7 m/s.
The graph A 'B' is at larger distance from time-axis than the graph AB.
Speed-time graphs for uniform speeds of 4 m/s and 7 m/s.
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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 ?
What produces more severe burns, boiling water or steam ?
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