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solve

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New post 18 Feb 2018, 08:07
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New post 19 Feb 2018, 04:42
1971 wrote:
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A poorly written Question..
But still the answer would be..
It's basically a circle of 10 units..
So one rotation of that point is circumference of this circle, so 2*π*10=20π
300 rotation per minute means 5 rotation in 1second..
So 15*5=75 in 15 seconds..
So the point will travel 75 rotation or 75*20π=1500π
B
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New post 19 Feb 2018, 08:28
thanks so much

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New post 19 Feb 2018, 08:58
1971 wrote:
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Radius = 10 cm
In 1 revolution, the point moves distance = Circumference of the circle = 2πx10=20π
Fan rotates at 300 rev/min = 300/60 =5 rev/s
In 15sec, the point moves distance = 20π x 5 x 15 = 1500π

Answer B.
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New post 21 Feb 2018, 14:32
1971 wrote:
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The distance in 1 revolutions is 2π*10 = 20π.
The fan rotates 75 time in 1/4 mins, since (1/4)*300 = 75.

Thus the distnace in 1/4 mins with the rate of 300rpm is 20π*75 = 1500π

Therefore, B is the answer.

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New post 21 Feb 2018, 18:28
thanks

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Re: solve   [#permalink] 21 Feb 2018, 18:28
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