Gravity and something more
Jihin Asked:
Some Things That I Have Always Wondered OF : (i hope it may be answered soon …)
1)is it possible that our human body can withstand pressures twice or more than the atmospheric pressure without a suite or is there any artificial instruments or means in which our heart can be made to pump into a level in which we can attain this ability !!!
2)when more gravity is experienced , it is said that time travels slowly – is it relative ??? caz time goes at a constant rate !!! it is only the position or view that makes the observer feel the situations ???
3) Is there any gravity chambers successfully made out … in which the gravity can be changed accordingly to observe diff. phenomena ??? Cant It be possible to do that ????
Ans:
To be posted soon.
However, I agree that I may not be able to give you a satisfying answer to all your queries, as “Science says the first word of everything and the last word of nothing.” We are learning new things everyday. When we explore more and more, we find that we know less and less and our knowledge is too meagre.
By the time I prepare a well fitting answer to this, visitors are also requested to respond to the question by posting answers and comments.
Categories: Gravitation Tags: Ans, answer, ask Physics, body, gravity, heart, physics, pressure, time
A Problem from Motion
Sandeepan Asked:
“Q. Velocity of a moving particle is given by v = t2 – 4. Find out:-
(i) Time at which velocity is zero.
(ii) Acceleration at which t= 1s
(iii) What type of motion uniform or non-uniform.”
Ans:
In the equation, put v=0 to find the time at which velocity equals zero
Differentiate the equation and then put t=1 to find acceleration at t=1s since a = dv/dt
The motion is non uniform as its velocity varies with time.
Categories: Ask Physics Tags: acceleration, Ans, ask Physics, Auto, Draft, iii, motion, particle, physics, uniform, velocity
Cosmological Constant and its Significance
Abdul Najeeb asked via Facebook:
Would you plz explain me what is a cosmological constant? When Einstein snubbed it as the "biggest blunder" in his life, what else is the real importance of the constant? Also what is cosmological acceleration and its’ effect on the constant…plz…but in simple words…plzzzz:)))))
Ans:
The cosmological constant was proposed by Albert Einstein as a modification of his original theory of general relativity to achieve a stationary universe.
Einstein abandoned the concept after the observation of the Hubble redshift indicated that the universe might not be stationary, as he had based his theory on the idea that the universe is unchanging.However, the discovery of cosmic acceleration in the 1990s has renewed interest in a cosmological constant.
{courtesy : Wikipedia}
More details will be added soon
Categories: Ask Physics, Interesting Questions Tags: acceleration, Ans, ask Physics, bigbang, cosmological constant, einstein, expanding universe, physics, theory, theory of general relativity
TENSILE FAILURE STERSS
john Alexander asks
Is the energy required to break a sample of string proportional to the length of string or is the energy requirednto break the sting constant?
Ans
The energy required to break a string depends on the stress known as tensile failure stress.It is not related to the length of the string .for more knowledge ref. Mohr’s theory
Categories: Ask Physics Tags: Ans, energy, knowledge, length
