Water begins to flow towards the ground as soon as we open a tap. This happens due to which force?

The absorption of which nutrient is happened due to presence of phytate?

Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as

Find out the minimum height from which a piece of ice at 0^(@)C should be dropped so that it melts completely due to its impact with the ground. Assume that half of the energy loss due to the fall is responsible for the fusion of ice. (Latent heat of fusion of ice = 80 cal cdot g^(-1), g = 980 cm cdot s^(-2) , J = 4.2 J cdot cal^(-1))

The cohesive force bof water is due to

A ring of mass 0.3 kg and radius 0.1 m and a solid cylinder of mass 0.4 kg and of the same radius are given the same kinetic energy and released simultaneously on a flat horizontal surface such that they begin to roll towards a wall at the same distance from both of them. If the rolling friction in both the cases are negligible, which one of them will reach the wall first ?

Assertion A: The renal fluid becomes increasingly concentrated when it flows down in the descending limb of loop of Henle towards the inner medulla but its concentration decreases in the ascending limb when it flows towards the cortex Reason R: The descending limb of the loop of Henle reabsorbs water, the ascending limb is impermeable to water but salts are reabsorbed