Advertisements
Advertisements
प्रश्न
An ice cube is suspended in vacuum in a gravity free hall. As the ice melts it
पर्याय
will retain its cubical shape
will change its shape to spherical
will fall down on the floor of the hall
will fly up.
उत्तर
As the ice cube melts completely, the water thus formed will have minimum surface area due to its surface tension. Any state of matter that has a minimum surface area to its volume takes the shape of a sphere. Therefore, as the ice melts, it will take the shape of a sphere.
APPEARS IN
संबंधित प्रश्न
Explain why The angle of contact of mercury with glass is obtuse, while that of water with glass is acute
A uniform vertical tube of circular cross section contains a liquid. The contact angle is 90°. Consider a diameter of the tube lying in the surface of the liquid. The surface to the right of this diameter pulls the surface on the left of it. What keeps the surface on the left in equilibrium?
If water in one flask and castor oil in other are violently shaken and kept on a table, which will come to rest earlier?
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, the length of water column in the capillary tube will be
The contact angle between a solid and a liquid is a property of
(a) the material of the solid
(b) the material of the liquid
(c) the shape of the solid
(d) the mass of the solid
Consider a small surface area of 1 mm2 at the top of a mercury drop of radius 4.0 mm. Find the force exerted on this area (a) by the air above it (b) by the mercury below it and (c) by the mercury surface in contact with it. Atmospheric pressure = 1.0 × 105 Pa and surface tension of mercury = 0.465 N m−1. Neglect the effect of gravity. Assume all numbers to be exact.
A capillary tube of radius 0.50 mm is dipped vertically in a pot of water. Find the difference between the pressure of the water in the tube 5.0 cm below the surface and the atmospheric pressure. Surface tension of water = 0.075 N m−1.
A cubical block of ice floating in water has to support a metal piece weighing 0.5 kg. Water can be the minimum edge of the block so that it does not sink in water? Specific gravity of ice = 0.9.
The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly ______.
The water droplets are spherical in free fall due to ______
Explain the phenomena of surface tension on the basis of molecular theory.
Explain elasticity using intermolecular forces.
Mention the S.I unit and dimension of surface tension.
Distinguish between cohesive and adhesive forces.
Obtain an expression for the excess of pressure inside a
- liquid drop
- liquid bubble
- air bubble
A spherical soap bubble A of radius 2 cm is formed inside another bubble B of radius 4 cm. Show that the radius of a single soap bubble which maintains the same pressure difference as inside the smaller and outside the larger soap bubble is lesser than the radius of both soap bubbles A and B.
Soap solution is used for cleaning dirty clothes because ______.
When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes `(5r)/4`. Taking the atmospheric pressure to be equal to the 10 m height of the water column, the depth of the lake would approximately be ______.
(ignore the surface tension and the effect of temperature)
The surface tension of soap solution is 25 × 10-3 Nm-1. The excess of pressure inside a soap bubble of diameter 1 cm is ______.
The surface tension of boiling water is ______.
