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Matter In Our Surroundings
How can we specify the position of an object?
The position of an object can be specified by choosing:
(i) a fixed point called ‘origin’ or reference point, and
(ii) a fixed line passing through the origin, called reference axis.
So the position of an object can be fully described by knowing:
(i) its distance from origin O and
(ii) the angle θ which the line joining the origin O and the object makes with the reference axis.
In Fig. the position of an object located at point P is 6 m from the origin and 30° north of east.
Fig. To specify the position of an object (Scale: 1 cm = 1m).
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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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