Question

0 A U-tube has one limb with area of cross-section so
twice that of the other. Mercury is filled in the la
tube and it stands at the same level in both limbs.
Water is poured in the wider tube so that mercury
level in it goes down by 1 cm. What is the height
of water column? +
ET CELL, AYNAGAR JOSHI'S PHYSICS
It
WATER
51
MERCURY
a 13.6 cm b) 27.2 cm c) 40.8 cm d) 54.4 cm
By sucking through a straw, a student can reduce​

Answer 1

Answer:

The paradoxical aspect of the twins' situation arises from the fact that at any given moment the travelling twin's clock is running slow in the earthbound twin's inertial frame, but based on the relativity principle one could equally argue that the earthbound twin's clock is running slow in the travelling twin's inertial frame.[19][20][21] One proposed resolution is based on the fact that the earthbound twin is at rest in the same inertial frame throughout the journey, while the travelling twin is not: in the simplest version of the thought-experiment, the travelling twin switches at the midpoint of the trip from being at rest in an inertial frame which moves in one direction (away from the Earth) to being at rest in an inertial frame which moves in the opposite direction (towards the Earth). In this approach, determining which observer switches frames and which does not is crucial. Although both twins can legitimately claim that they are at rest in their own frame, only the traveling twin experiences acceleration when the spaceship engines are turned on. This acceleration, measurable with an accelerometer, makes his rest frame temporarily non-inertial. This reveals a crucial asymmetry between the twins' perspectives: although we can predict the aging difference from both perspectives, we need to use different methods to obtain correct results.