A metal plate of area 500 cm^2 is kept on a horizontal surface with a layer of castor oil of thickness 0.5 mm between them. The ho

2 thoughts on “A metal plate of area 500 cm^2 is kept on a horizontal surface with a layer of castor oil of thickness 0.5 mm between them. The ho”

1. Answer:

   Area A=500㎠=500×10−4㎡

   Thickness dx=2㎜=2×10−3m

   Co efficient of viscosity=15.5 poise=1.55pa

   Velocity=3㎝s−1=3×10−2㎧

   F=ηA(dxdv)

   =2×10−315.5×10−1×500×3×10−4×10−2

   =10−523.25×10−7

   F=0.2325N

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2. Explanation:

   Question:

   How many numbers can be obtained using 100 digits by replacing the positions of digits and not repeating?

   How many numbers can be obtained using 100 digits by replacing the positions of digits and not repeating? Answer:

   No. of numbers than can be obtained using 100 digits = 1×2×3×4×5×.. × 100

   The product will be answer.

   (you can check it, it is right.)

   ☆It means if the number of digits = n,

   then multiply the natural numbers from 1 to n .

   Hope you got it..

   Try it and check.. I’ll work.

   Reply