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Ultimate pendulum Clock - William Shortt

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Manager
Manager
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Joined: 02 Jul 2016
Posts: 79

Kudos [?]: 3 [0], given: 7

Re: Ultimate pendulum Clock - William Shortt [#permalink]

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New post 25 Nov 2016, 19:42
It took me 10.26 minutes to solve this one....
I know its an unacceptably long. But I think seeing the length and cogent thinking required in this passage (specially in Q1 andQ3),
this passage deserves that much time.

I am sceptical about the solution of Q1, Yes the clock works on pendulum, but in the first line of the passage it is mentioned it is the best of the mechanical clocks, in the C option is too generalised saying No other clock......

Also in Q4 I was hinged between A and C, ending up choosing A. The reason being that since we in the end of 3rd para and starting of the 4th para it is mentioned about how Shott's clock is able to predict about tides. We can predict that only when we know about how the tides are caused....


Can anybody tell me where I am wrong????????????

Kudos [?]: 3 [0], given: 7

Intern
Intern
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B
Joined: 28 Mar 2017
Posts: 3

Kudos [?]: 0 [0], given: 11

Re: Ultimate pendulum Clock - William Shortt [#permalink]

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New post 31 Aug 2017, 07:49
Could someone shine light on question number 2? How can it be D. IMO C is directly implied in the passage.

The only statement that I could find related to option D was the following,
Quote:
Since the acceleration due
to gravity depends on distance from the center of the
earth, this slight tidal movement affects the period of
swing of a pendulum.


and that implies it is the rotation that helped discover something about the clock and not the other way around.

Thanks in advance!

Kudos [?]: 0 [0], given: 11

Intern
Intern
User avatar
B
Joined: 29 Jan 2015
Posts: 40

Kudos [?]: 10 [0], given: 217

Location: India
Concentration: Marketing, Entrepreneurship
GPA: 3.7
WE: Information Technology (Internet and New Media)
Re: Ultimate pendulum Clock - William Shortt [#permalink]

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New post 17 Sep 2017, 09:13
really good passage.

3/4 in 8.3min.
'
But for question 4 why is the ans. b r8? (yet it has 1 indication that 'primary pendulum swung freely in a vacuum chamber.')
Why is the ans. c not r8. (visual information is badly needed to take data ' Many were on record as losing or gaining no more
than one second in a year—a stability of one part in
30 million. The first indications of seasonal variations in
the earth's rotation were gleaned by the use of Shortt
clocks.')

Kudos [?]: 10 [0], given: 217

VP
VP
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G
Status: Learning
Joined: 20 Dec 2015
Posts: 1073

Kudos [?]: 69 [0], given: 535

Location: India
Concentration: Operations, Marketing
GMAT 1: 670 Q48 V36
GRE 1: 314 Q157 V157
GPA: 3.4
WE: Manufacturing and Production (Manufacturing)
Ultimate pendulum Clock - William Shortt [#permalink]

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New post 18 Sep 2017, 10:17
Question 4. The passage most strongly suggests that which of the
following is true of the chamber in which a Shortt clock's
primary pendulum was housed?

A) It contained elaborate mechanisms that were
attached to, and moved by, the pendulum.

B) It was firmly sealed during normal operation of the
clock.

C) It was at least partly transparent so as to allow for
certain types of visual data output.

D) It housed both the primary pendulum and another
pendulum.

E) It contained a transmitter that was activated at
irregular intervals to send a signal to the secondary
pendulum.

The primary pendulum did not contain electro mechanical linkage rather ti was connected by electro mechanical linkage to secondary pendulum.

The
primary pendulum swung freely in a vacuum chamber.
Its only job was to synchronize the swing of the
secondary pendulum, which was housed in a
neighboring cabinet and drove the time-indicating
mechanism. Every 30 seconds the secondary pendulum
sent an electrical signal to give a nudge to the primary
pendulum. In return, via an elaborate electromechanical
linkage, the primary pendulum ensured that the
secondary pendulum never got out of step.

_________________

We are more often frightened than hurt; and we suffer more from imagination than from reality

Kudos [?]: 69 [0], given: 535

Ultimate pendulum Clock - William Shortt   [#permalink] 18 Sep 2017, 10:17

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