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## Physics and Mathematics hello sir
This is anurag choudhary. I am a post BSc student of Physics . I have special liking for science and mathematics in all  its aspects. In free time I think about general  relations of  science and in this pursuit I have written a short thought  question that I want to share with you.  My question   and explanation are as explained below.
Thinking is a common and continuous process for all of us. Now I have a question, “have you ever thought whether thinking is reversible or irreversible process. let us try to understand  it. suppose somebody asks us about components of knowledge so  far as fact based knowledge is concerned, one can discuss about science, mathematics,humanity and commerce. if we  ask a particular person belonging to above stream they will  answer  according to their stream or what they have learnt in their text. Even in public life  we discuss an  event related to past and then come to conclusion so actually  we are making conclusions based on no of references we have. what does reference mean here ? Reference here mean how many past experiences we have? see what we think today is a reflection of our next day approach so we can say our present day thinking is a function of our past thinking and future is extension of coming past i.e today’s present so our present past and future is related to our thinking
process and we can conclude our present and future is an extension of past and it is the past which relates present
and future. thus we can conclude our thinking process is reversible. also we can think as future and present are forms of past so we can say thinking process is a mathematical function and that function is symmetric about past as origin
and also we can say time is reversible in nature as our everyday discussion starts with past and again same past is repeated isn’t this mean past is a composite vector space and our life is discussed as its components i.e subspaces. and also we can say past is a vector space and present and future are its subspaces.Now what i mean to express from
past experiences is that past is a reference frame for time to make present day observation. Have we ever thought of any thinking without reference frame of time? or have we ever thought why past repeats as cyclic representation of vector spaces? it is basically our thinking process which repeats and it went through same angle and curvature at particle time so can we think is this the source of relativity of nature?

## Calculating g on Moon

An astronaut on the moon wishes to calculate the local g in the area. He sets up a wire with a mass of 1.7 grams and hanging from it an object with mass 4.98 kg. He sends some kind of pulse down the wire and calculates that it takes 40.86 ms to traverse the wire. What is g? You can neglect the mass of the wire when calculating the tension.

That was everything that was given in the problem. I have not a clue how to solve it. What I did was just use the equation of T=2pi[sqrt(l/g)] to solve for g and hope that the wire acts like a spring or something.

I’m totally sure that’s incorrect, but hey I’m not an astrophysicist.

(Response from Members and visitors awaited)

Posted by Ashish Dharva ## Spaceship and gravity – a problem

A spaceship is launched and starts moving directly towards the Moon. At what distance from the earth will the pull of the Moon on the spaceship exceed the pll of the Earth? Ignore the effect of the sun in this calculation

## A Question from Errors in measurement

An experiment measures quantities a,b and c, and X is
calculated from

if the percentage error in a,b,c are ±1%, ±5%, ±2%  respectively, the percentage error in X will be
a) 7%
b) 5%
c) 1%
d) 9%

Percentage error = 1x percentage error in a + 2 x percentage error in b + 3 x percentage error in c

= 1×1 +2×5+3×2

=1+10+6

= 17%

SO there could be a misprint in the question posted by you.

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