A porter lifts a luggage of 15 kg from the ground and puts it on her head 2 m above the ground. Calculate the work done by her on the luggage? Take g - 10 ms-2.
Force applied is equal to the weight of object = mg = 15 x 10 = 150 N
Displacement, s = 1.5 m
Work done, W = Fs = 150 N x 1.5 m
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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