The figure above shows the present position on a radar : GMAT Data Sufficiency (DS)
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# The figure above shows the present position on a radar

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16 May 2008, 16:37
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The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?

(1) In each 30-second period, the beam sweeps through 3690°
(2) r = 40
[Reveal] Spoiler: OA

Last edited by Bunuel on 16 Apr 2014, 01:35, edited 2 times in total.
Renamed the topic and edited the question.
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Re: The figure above shows the present position on a radar [#permalink]

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16 Apr 2014, 01:39
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PathFinder007 wrote:
Bunnel could you please look into this question. its not clear

The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?

(1) In each 30-second period, the beam sweeps through 3690° --> 3690 = 10*360 + 90 = 10 revolution + 90 degrees. Regardless the value of r, the beam will be in the IV quadrant. Sufficient.

(2) r = 40. Clearly insufficient.

Hope it's clear.
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17 May 2008, 07:51
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wizardofwashington wrote:
To answer this question, we need to know the current position of the beam (i.e r) and we need to know the rate of rotation

1) gives us rate of rotation only, insuff
2) gives us r=40 degrees, insuff

1)2). in 30 seconds, the beam will be in q1, with r = 40-3.69

I think The rate of rotation in Statement 1 is enough to answer the question because the image shows the radar bear somewhere in the middle of the 1st Quadrant (near around 45degrees). Statement 2 simply reaffirms the position of the beam within the 2nd quadrant. Can someone confirm the OA?

But no where its mentioned teh diagram is drawn to scale. The OA is A. But I diagree fo rthe same reason I mentioned in my previous sentence.

C makes sense.
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30 Apr 2009, 01:03
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The present position of radar: 0 < r < 90 degrees
A: during 30 seconds the beam will sweep through 3690 degrees, i.e. 3600 + 90 degrees: it will make 10 complete turns + 90 more degrees. We will have 0+90 < r+90 < 90+90 => 90 < r+90 < 180, which tells us that the beam will be in the 2nd quadrant.
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Re: Radar.jpg 9. The figure above shows the present position on [#permalink]

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14 Feb 2013, 11:50
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Hello Friends,

just read in OG quant 2nd edition that The position of points, angles, regions, etc., exist in the order shown.

so if the given figure showing the present position of radar in the middle of first quadrant, we can assume so and can go with choice A
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Re: The figure above shows the present position on a radar [#permalink]

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19 Feb 2014, 10:13
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Guys,

I think there's nothing wrong with the question other than a typo and it's 3,690°. Which I didn't even realize at first because I'm from Brazil, and here works the opposite way. The decimal "point" is "," and the "," is the decimal point.

So, the present position of the sweeping beam it's the one in the figure. "The figure above shows the present position on a radar screen of a sweeping beam"
Every 90° the sweeping beam will change quadrants, and every 4 times it will come back to the starting point. If we divide 3690 by 90 we get 41. So, that means it will rotate and go back to the starting point 10 times (10*4 = 40) and one more time (10*4+1=41) So. the answer would be A. It will be in the 4th quadrant.

Hope it helps.

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16 May 2008, 18:09
goalsnr wrote:
9. The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?
(1) In each 30-second period, the beam sweeps through 3.690°
(2) r = 40

Please see attached document for teh diagram.

From what I see, the answer would be A. The current position of the Radar beam is somewhere in the middle of the first quadrant and it moves only 3.690degrees, which would still be well within 90degrees. Statement 2 by itself can't offer much since it doesn't tell you the rate of movement.

What's the OA?
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18 May 2008, 02:02
goalsnr wrote:
9. The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?
(1) In each 30-second period, the beam sweeps through 3.690°
(2) r = 40

Please see attached document for teh diagram.

To rephrase this question, is the beam with r deg still in the same quadrant?

Statement (1) alone gives us the speed and degree of the movement of the beam every 30-second period. Sufficient for us to know whethere the beam is. Eliminate B, C and E.

Statement (2) alone tells us r = 40. But not where it can be 30 seconds from now. Not sufficient. Eliminate D.

Ans: A
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18 May 2008, 06:08
jimmylow wrote:
goalsnr wrote:
9. The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?
(1) In each 30-second period, the beam sweeps through 3.690°
(2) r = 40

Please see attached document for teh diagram.

To rephrase this question, is the beam with r deg still in the same quadrant?

Statement (1) alone gives us the speed and degree of the movement of the beam every 30-second period. Sufficient for us to know whethere the beam is. Eliminate B, C and E.

Statement (2) alone tells us r = 40. But not where it can be 30 seconds from now. Not sufficient. Eliminate D.

Ans: A

In which of the four quadrants will the beam lie 30 seconds from now ?

We have no information regarding the current position.
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30 Nov 2008, 20:30
The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?
(1) In each 30-second period, the beam sweeps through 3.690°
(2) r = 40

Not sure if there's a typo in the question, but the OA is A, which I don't think it's right.
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02 Dec 2008, 15:21
I will go with C as well

Here is why

1 - Don't know beams current position - Insuff
2- Insuf

Together I know where currently the beam is and the rate
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03 Dec 2008, 05:53
HG wrote:
I will go with C as well

Here is why

1 - Don't know beams current position - Insuff
2- Insuf

Together I know where currently the beam is and the rate

You need not to have value of R, as question says its angular rotation which will be same irespective of value of r. Hence stem 1 is suff.
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28 Apr 2009, 11:28
I think its a typo error in answer A and it shuld b 360 degree which makes sense of the OA (A)
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29 Apr 2009, 23:17
Just after looking at the figure think that angle r is 2degrees and then think that angle r is say 10 degrees.
When you think that it is 2 degrees then after 30 seconds we the beam will in quadrant 2.
If angle r is 10degrees then after 30 seconds it will stay in quadrant 1.
All the books says that the figure are not drawn to scale in a DS question.
There is no way option A is suff.
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06 May 2009, 18:35
Can anyone provide further detail on why the OA is A?

I believe there is type in the question. It should be 3690° instead of 3.690°

In this case Answer will be A .

3690 --> 360*10 +90 --> It will be in the fourth quadrant.. We don't require R value.
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Re: Radar.jpg 9. The figure above shows the present position on [#permalink]

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17 Feb 2014, 12:48
Narenn wrote:
Hello Friends,

just read in OG quant 2nd edition that The position of points, angles, regions, etc., exist in the order shown.

so if the given figure showing the present position of radar in the middle of first quadrant, we can assume so and can go with choice A

I first thought this problem was flawed, but then I realized:

3690 --> 360*10 +90 --> It will be in the fourth quadrant. So we don't require R value at all. I think it should be A

Hope this helps
Cheers
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Re: The figure above shows the present position on a radar [#permalink]

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15 Apr 2014, 02:51
Bunnel could you please look into this question. its not clear
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Re: The figure above shows the present position on a radar [#permalink]

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23 Apr 2015, 00:17
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Re: The figure above shows the present position on a radar [#permalink]

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24 Jun 2016, 07:45
Hello from the GMAT Club BumpBot!

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Re: The figure above shows the present position on a radar [#permalink]

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07 Jul 2016, 07:01
Hey Bunuel

Can we assume that the figure given is drawn to scale ? Most of the resources I go through suggest that it's always better not to rely on the figure. I approached the question in the same but wasn't sure about the accuracy of figure.
Re: The figure above shows the present position on a radar   [#permalink] 07 Jul 2016, 07:01

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