Aptitude - 1) There are two balls touching each other circumferencically.The radius of the big ball is 4 times

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Aptitude | Question 39 of 135

1) There are two balls touching each other circumferencically.
The radius of the big ball is 4 times the diameter of the small ball.The outer small ball rotates in anticlockwise direction
circumferencically over the bigger one at the rate of 16 rev/sec.The bigger wheel also rotates anticlockwise at Nrev/sec. what is \'N\' for the horizontal line from the centre of small wheel always is horizontal.?

Total Answers and Comments: 4

Last Update: April 11, 2007 Asked by: sharad vasisht

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November 27, 2005 14:41:55

murali krishna

RE: 1) There are two balls touching each other circumf...

N 2

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December 20, 2005 14:35:26

abh2001mah

Member Since: December 2005 Contribution: 5

RE: 1) There are two balls touching each other circumf...

N is not equal to 2.

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April 01, 2006 00:15:25

seetha

RE: 1) There are two balls touching each other circumf...

Revoultion o f small ball 16

2*22/7*r 16

r 8/(22/7)

radius of big ball 4d

32/(22/7)

2*(22/7)R N

R 32/(22/7)

N 2*(22/7)*32/(22/7)

N 64rev/sec

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April 11, 2007 06:43:42

Rahul Chandrashekar

RE: 1) There are two balls touching each other circumf...

According to my calculation's the answer should be 2

Reason :

r1 8 r2

distance travelled in 16 revoulutions for 1 sec
16 (2pi r2)

r2 (1/8) * r1

sub in the equation

hence we get 2(2 pi r1) is the distance travelled by the big ball in 1; hence it rotates 2 times in one second; so N 2

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