Short Answer TypeA brass ball is hanging from a stiff cotton thread. Draw a neat labelled diagram showing the forces acting on the brass ball and cotton thread.
The distance between two bodies is doubled. How is the magnitude of the gravitational force between them affected?
A solid of mass 50 g at 150°C is placed in 100 g of water at 11°C, when the final temperature recorded is 20°C. Find the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J/g°C)
Mass of the solid, ms = 50 g
Initial temperature of the solid, ts = 150°C
Mass of water, mw = 100 g
Temperature of water, tw = 11°C
Final temperature of the mixture, t = 20°C
According to the principle of calorimetry,
Heat gained by water = Heat lost by the solid
∴mwcw(t-tw)= mscs(ts-t)
∴100x 4.2 x(20 -11) = 50 xcs x (150-20)
3780 = 6500cs
3780/6500 = 0.581 J/g°C
How is the refractive index of a material related to:
(i) real and apparent depth?
(ii) velocity of light in vacuum or air and the velocity of light in a given medium?
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