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Matter In Our Surroundings
Yes, it is possible that a force is acting on a body but the work done is zero.
E.g., Consider a coolie carrying a load on his head across a level road. He exerts an upward force equal to the weight of the load. But the displacement of the load is in the horizontal direction. Thus the angle between force F and displacement s is 0°.
Hence,
W = Fs cos 90° = 0.
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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
What is the physical state of water at
0°C
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