A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator

(b) : In a freely falling elevator g = 0 Water will rise to the full length i.e., 20cm to tube.

The correct answer is (c) > 76 cm EXPLANATION:  Since the pressure of the mercury column 76 cm high in the upward accelerating elevator is more than the stationary elevator condition due...

The correct answer is (b) 10√2 cm Explanation:  When the tube is inclined, the vertical rise remains the same. So the water in the inclined tube rises to 10*sec45° =10√2 cm.

The correct answer is (d) 20 cm. Explanation:  The rise in a capillary tube is given as h = 2S.cosθ/rρg When the entire arrangement is in a freely falling elevator, the effective...

(c) The surface tension may be zero. (d) The contact angle may be 90°. Explanation:  The rise in a capillary tube is given as, h = 2S.cosθ/rρg The capillary tube has a certain...

P =2T/r P = F/r

(b) going up and speeding up (c) going down and slowing down Explanation: If we are going to use Newton's laws of motion in a non-inertial frame like accelerating elevator, we have to...

(c) going up with uniform speed (d) going down with uniform speed. Explanation: In both (c) and (d), acceleration is zero. So, T=mg

(d) The length of water column in the capillary tube will be 20cm.

solution (A,C) h = (2σcosθ)/(rρgeff)(ρ is density of water)