A boy and girl do the same work in 5 minutes and 10 minutes respectively. Which of these two has more power and why?
Power is given by,
That is, power and time are inversely proportional to each other.
Here, in the given case, as the boy takes less time to do the same work as compared to the girl, so power of the boy is more than that of the girl.
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.
Give two reasons to justify
An iron almirah is a solid at room temperature.
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