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19 May 2016, 03:19
Kudos
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C
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Difficulty:
15%
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Question Stats:
82% (00:56) correct
18%
(00:52)
wrong
based on 126
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A wheel of radius 2 meters is turning at a constant speed. How many revolutions does it make in time T?
(1) T = 20 minutes.
(2) The speed at which a point on the circumference of the wheel is moving is 3 meters per minute.
(1) T = 20 minutes.
(2) The speed at which a point on the circumference of the wheel is moving is 3 meters per minute.
19 May 2016, 07:30
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Bunuel
Lets look at the info from Q stem...
A wheel of radius 2 meters is turning at a constant speed...
so this will give us the circumference and thus the distance covered in each revolution..
What is asked?
how many revolutions--- it will depend on time and speed..
lets see the statements
(1) T = 20 minutes.
Time is known BUT speed is also required..
Insuff
(2) The speed at which a point on the circumference of the wheel is moving is 3 meters per minute
Speed is known BUT time is also required
Insuff
Combined-
Both are known..
speed*time will give distance = 20*3 = 60 m..
# of revolutions = \(\frac{60}{2*pi*2}\)
Suff
C
04 Jun 2021, 02:59
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