A glass plante of negligible mass and thickness is held against the end of a tube and pushed 10 cm under the surface of water. When released, the plate does not fall off. What depth of kerosene oil of relative density 0.8 must be poured into the tube so that the plate just falls off?

A rectangular plate of dimensions 6cm xx 4 cm and thickness 2 mm is placed with its largest face flat on surface of water . (i) What is the downward force on the plate due to surface tension ? Surface tension of water =7.0 xx10^(-2) "Nm"^(-1) (ii) If the plate is placed vertical so that the longest side just touches the water surface, find the downward force on the plate.

An inverted u-tube has its two limbs in water and kerosene contained in two beakers. If water rises to a height of 10 cm to what height does kerosene (density =0.8gm//c c) rise in te other limb?

A cyclindrical ice block is floating in water 10% of its total volume is outside water. Kerosene oil (relative density=0.8) is poured slowly on top of water in the container. Assume that the oil does not mix with water. Height of the ice cylinder is H. (a) As kerosene is poured, how does the volume of ice block above the water level change? (b) What is the thickness of kerosene layer above the water when 20% of the volume of the ice block is above the water surface? (c) Find the ratio of voume of ice block is kerosene to its volume in water after the kerosene layer rises above the top surface of ice and the block gets completely submerged. Neglect any melting of ice.

(i) A cubical metal block of side 10cm is floating in a vessel contatining mercury. The vesel has a square cross section of side length 15cm. Water is poured into the vessel so that the metal block just gets submerged. Calculate the mass of water that was poured into the vessel. It is given that relative density of the metal and mercury are 7.3 and 13.6 respectively. (ii) In the last question, in place of water if we poured another liquid of relative density 'r' it was found that when the metal block ws just completely submerged it was no longer touching mercury. what is value of r?

A square glass plate of length 10 cm and thickness 0.4 cm, weight 40 g in air. It is held vertically such that its lower edge rests on water surface. What is the apparent weight of glass plate now? (Given surface tension of water = 0.073 N m^(-1) )

A square glass plate of length 10 cm and thickness 0.4 cm, weight 40 g in air. It is held vertically such that its lower edge rests on water surface. What is the apparent weight of glass plate now? (Given surface tension of water = 0.073 N m^(-1) )

A glass plate of length 10 cm., breadth 1.5 cm. and thickness 0.2 cm., weighs 8.2 gm. In air. It is held vertically with long side horizontal and half the plate immersed in water. What will be its apperent weight ? Surface tension of water = 73 dynes//cm.

A glass plate of length 8cm, breadth 3 cm and thickness 0.2cm weighs 15 g in air. What will the apparent weight of the plate if it is half immersed vertically in water its long side held hrizontal? Take, Surface tension of water =70 dyne/cm

A glass plate of length 10 cm, breadth 4 cm, and the thickness 0.4cm , weighs 20g in air. It is held vertically with long side horizontal and half the plate immersed in water. What will be its apparent weight? Surface tension of water = 70 dyn e//cm .