4) two rods are identical in all respects, unless it is a material that is diffe

Question

4) two rods are identical in all respects, unless it is a material that is different from both the rods: first bar is made of aluminium while the others are made of tungsten. The end of both rods are connected to each other so as to produce a composite rod length twice the length of each rod. Determine the effective value of Young's modulus of composite rods.( Modulus Young's aluminium and tungsten, respectively 6.9x10^10 N/m2 and 3.6x10^11 N/m2) 5)Upin and Ipin are twins. Ipin's mass is 80kgand Upin is lighter than Ipin. Both sat on the opposite ends of a boat within 3m. The boat has a mass stationary on the surface of still water(without friction), Upin and Ipin swapped sitting positions. If the boat moves as far as 40cm from its original position, determine the mass of Upin.

Explanation / Answer

y net=y1*y2/(y1+y2)
boat moves to maintain the net equilibrium of masses i.e centre of mass ramains same
means previously centre of mass was 20 cm from physical centre..
m1*1.3=m2*1.7
m1=m2*1.7/1.3

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