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ALL CIE PHYSICS DOUBTS HERE !!!

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ashwinkandel:
Hello Sir(astarmathsandphysics) Can you give me explanation for q no. 7. If height falls by h/2 then how loss in GPE is mgh/4

astarmathsandphysics:
cos only half the mass falls ie moves from one tank to the other

angel_ak:
answer my question too :(

astarmathsandphysics:
average diameter =(1.05+1.04+1.06)/3=1.06mm
r=1.06/2=0.53mm
V=pi r^2 l= 3.14*(0.53*10^-3)^2*0.1=8.82*10^-8 m^3
Since the diameter is +-about 2.5% take only 1 sig fig A

silvercameron:
Q) Find the diameter of a copper wire which has the same resistance as an aluminium wire of equal length and diameter 1.20 mm. The resistivities of copper and aluminium are 1.7 x 10-8 and 2.6 x 10-8 respectively.

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