Question

physics:- a block of glass in 25cm long, 10cm wide and 3cm thick. find it's density of it's mass is 7.5kg​

Answer 1

Explanation:

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A glass hemisphere of refractive index 4/3 and of radius 4cm is placed on a plane mirror. A point object is placed at distance d on axis of this sphere as shown. If the final image be at infinity, find the value of 'd'.

Answer 2

Given,

a block of glass in 25cm long, 10cm wide and 3cm thick.

Length = 25 cm = 0.25 m

Breadth = 10 cm = 0.1 cm

Thickness = 3 cm = 0.03 m

Volume = length * breadth * thickness

or, V = 0.25 * 0.1 * 0.03

or, V = 75 * 10^-3 m³

Density is defined as mass per unit volume,

or, d = mass / volume

or, d = 7.5 / 75*10^-3

or, d = 10000 kg / m³

Therefore, densityof block of glass is 10^4 kg / m³.