Answer:
Tension at the bottom of the swing T = 52.794N
Explanation:
Detailed explanation and calculation is shown in the image below
I believe it's the the third one. :)
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Answer:
The change in the mass of box = 0.01 kg
Volume of air in the polythene bag = Volume of air in the rigid box
Therefore, Volume of air in the box = 0.008 m^3
Now, Density = Mass/ Volume
=> Density = 0.01 / 0.008 = 1.25 Kg / m^3
Explanation:
I looked it up