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Matter In Our Surroundings
When is a body said to have
(i) uniform velocity and
(ii) variable velocity ?
(i) Uniform velocity:
If a body covers equal distances in equal intervals of time in a given direction, the body is moving with a ‘uniform velocity’. The velocity of the body does not change with time. So in uniform velocity, a body moves with uniform speed in a given direction.
For example, light travels with a uniform velocity of 3×10 m/s through vacuum.
(ii) Variable velocity:
When a body travels unequal distances in equal intervals of time, such that its direction changes, or both change, velocity is said to be ‘variable velocity’.
For example, a bus turning at a junction has variable velocity.
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Convert the following temperature to Celsius scale.
300K
Convert the following temperature to Celsius scale.
573 K
Convert the following temperatures to Kelvin scale
25°C
What is the physical state of water at
100 °C
For any substance, why does the temperature remain constant during the change of state ?
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
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