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Matter In Our Surroundings
When do you say a body is in
(i) uniform acceleration, and
(ii) variable acceleration?
(i) Uniform acceleration:
When an object travels in a straight line and its velocity changes by equal amounts in equal intervals of time, the object is said to be in ‘uniform acceleration’.
For example, a body falling freely to the ground has a uniform acceleration of 9.8 m/s2 as its velocity increases by 9.8 m/s after every one second.
(ii) Variable acceleration:
When the velocity of an object changes by unequal amounts in equal intervals of time, the object is said to have ‘variable acceleration’.
For example, if the speed of a car travelling along a straight road increases by unequal amounts, then the car is moving with non-uniform acceleration.
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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
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.
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