Question

Q1. Three cubes of same size made of iron lead copper are put in water they sink. On which cube will the buoyant force be greatest?why?does it depend on density?

Q2. what is the formula for pulse?

Q3. a rope 12m long is tightly stretched between two points. A pulse generated in it travels forward and backward in 4 seconds. Calculate speed of pulse. step by step explanation

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Answer 1

ans 1) since the cubes are made up of same size so the length of the sides of three cubes will also be same

now, since the sides are same then the volumes occupied by them will also be same( VOLUME = $side^{3}$ )

so we have V1=V2=V3

now, we know that the buoyant force = (volume of the object immersed) x density of liquid( and not the material) x g

since volumes are same , density of water is constant and g is constant so they all will experience equal bouyant force.

and the bouyant force is indepent of the density of material  

but it depends on the density of liquid.

i hope that i made it clear:)