Water is falling on the blades of a turbine at the rate of 6 x 103 kg per minute. The height of the fall is 10 m. Calculate the power given to the turbine. Take g = 10 m/s2.
Here,
Mass of water falling on the turbine, m = 6 x 103 kg
Rate at which the water is flowing, t = 1 min = 60 s
Height of the fall, h = 10 m, g = 10 m/s2
So, power given to the turbine, P =
= =10 kW
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.
Why is ice at 273K more effective in cooling than water at the same temperature ?
What produces more severe burns, boiling water or steam ?
8. Name A, B, C, D, E and F in the following diagram showing state change :
Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process
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