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Matter In Our Surroundings
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Yes, there can be displacement of an object in the absence of any force acting on it.
We know that F = m x a, then m x a = 0 for F = 0
Since mass 'm' cannot be zero, therefore, when force F = 0, then acceleration 'a' = 0. In such a situation, either the object is at rest or it is in uniform motion in straight line. For example, rain drops falling on the earth while the net force on them is zero. There is displacement of the water droplets.
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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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