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Numerical Problems from Pressure, Density and Floatation

1. Ramesh buys 6 bottles of syrup each containing 1litre. Each empty bottle weighs 400g. The density of syrup is 1.2 g/cm3. What weight does Ramesh have to carry home?

2. The volume of 900g of a substance is 1000 cm3. Will the substance sink or float in water if the density of water is 1g/cm3. What will be the mass of water displaced by the substance?

Why some substances are transparent while some others are opaque

Why some substance being solid enable light to pass through them (like glass, diamond (the hardest substance etc) but other who have less density do not permit refraction?

(Asked Brahmadutta Mahapatra)

Resultant magnetic force

What is resultant magnetic force? can you please explain with an example.

(Shreya)

Answer:

When a magnetic substance (or a magnet) is placed in a region where there are multiple magnetic fields, the net force due to all of them is called the resultant.

In other words, it is that magnetic force which can effectively replace all other magnetic force acting on it

(Need more explanation? Post as comment to this post for details)

 

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