Changing value of 'g' question...................

A pendulum was taken from place A to B.It was observed that it lost 150s each day.What is the value acceleration due to gravity at B???? g at A=9.8

#Physics #HelpMe!

Easy Math Editor

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Comments

Is the answer 9.766 m/s^2 ?

Saurabh Dubey - 8 years, 3 months ago

but how to do it??????????

Rajath Krishna R - 8 years, 3 months ago

Well let the time period of pendulum at A be T1 and at B be T2. wkt time lost by a pendulum in "t" secs is given by
$\frac{T2-T1}{T2}\times t$

Your question states that time lost is 150 s in a day i.e. in 86400 secs.

Hence 150= $\frac{T2-T1}{T2}\times 86400$
Using this you can find T2 in terms of T1.
You would get $\frac{T1}{T2} =\frac{86250}{86400}$
now you know that T1 is inversly propotional to $\sqrt{gA}$ and T2 is inversly proportional to $\sqrt{gB}$ therefore using it.
$\frac{\sqrt{gB}}{\sqrt{gA}}=\frac{86250}{86400}$ hence gB=0.9965308 * gA HENCE gB = 9.7660 m/s^2.

Let me know if the answer is corerect.

Saurabh Dubey - 8 years, 3 months ago

@Saurabh Dubey – i dnt knw whether the ans is right bcoz this Q came in our phy exam 2 days ago and no one could do it.............our teacher didnt teach us that time period formula also..............anyway thanks for the ans......................r u trying for IIT??????

Rajath Krishna R - 8 years, 3 months ago

@Rajath Krishna R – IITJEE!! thats too tough.. I am weak at chemistry I'am trying though. btw i hope you got the other graph question that you askd. This answer i'am 90 percent sure. Let me know the answer once you get to know it.

Saurabh Dubey - 8 years, 3 months ago

@Saurabh Dubey – kk....i will tell u if i get to know the correct ans........

Rajath Krishna R - 8 years, 3 months ago

is it 158.11

Sawan Singh - 8 years, 3 months ago

i think there will only be a small change............................points A and B are two places on earth....

Rajath Krishna R - 8 years, 3 months ago

Solution provided by saurabh is correct.

Sridhar Thiagarajan - 8 years, 3 months ago

@Sridhar Thiagarajan – Hope so. by the way your profile pic is quite funny!!! :D

Saurabh Dubey - 8 years, 3 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$