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A metal ball of radius 2 mm and density ...

A metal ball of radius 2 mm and density `10.5 g//c.c.` is dropped in glycerine of coefficient of viscosity `9.8 "dyne "cm^(-2)s` and density `1.5 g//c.c.` find the terminal velocity of the ball.

A

2cm/s

B

4cm/s

C

6cm/s

D

8cm/s

Text Solution

Verified by Experts

The correct Answer is:
D
Terminal velocity v is given by
` v = 2/9 r^2 ((rho - sigma)g)/(eta)`
` v =2/9 xx (0.2)^2 ((10.5 - 1.5)/(9.8)) xx 980 cm s^(-1) = 8 cms^(-1)`
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