Related InterviewSolutions

• A thin wire is bent in the form of a ring of diameter 3.0 cm . The ring is placed horizontally on the surface of soap solution and then raised up slowly . How much upward force is necessary to break the vertical film formed between the ring and the solution ? surface tension of a soap solution `=3.0 xx 10^(-2) "Nm"^(-1).`
• 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.
• Calculate the amount force required to take away a flat plate of radius 5 cm from the surface of water . Given surface tension of water `= 72 "dyne"" "cm^(-1).`
• A cubical block of wood 10 cm on a side floats at the interface between oil and water with its lower surface horizontal and 4 cm below the interface. The density of oil is `0.6 gcm^(-3)`. The mass of block is
• A force of `40 N` is applied on a nail , whose tip has an area of cross-section of `0.001 "cm"^(2).` Calculate the pressure on the tip.
• The radius of capillary tube is 0.025 mm. If is held vetically in a liquid whose density is `0.8 xx 10^(3) "kg" m^(-3),` surface tension is `3.0xx10^(-2)"Nm"^(-1)` and for which the cosine of the angle of contact is 0.3. Determine the height upto which the liquid will rise in the tube . Given `g=10"ms"^(-2).`
• A piece of ice floats in water . What fraction of its volume will be above the surface of water ? Given density of ice `=0.90 xx10^(3)"kgm"^(-3).`
• The surface area of a soap-bubble is `2.0xx10^(-3) m^(2).` How much work will be done in blowing the bubble twice its surface area? Surface tension of soap solution `=3.0 xx 10^(-2) "Nm"^(-2).`
• The diameter of a capillary tube is `0.4 xx 10^(-3)m`. It is held vertically in a liquid whose density is `0.8 xx 10^(3) "kgm"^(-3)` and the surface tension is `9.8 xx 10^(-2) "Nm"^(-1)`. Determine the height to which the liquid will rise in the tube. Given`g=9.8 "ms"^(-2)` and angle of contact is zero.
• A soap bubble of radius `1//sqrtpi "cm"` is expanded to radius `2//sqrtpi "cm".` Calculate the work done. Surface tension of soap solution `=30 "dyne"" "cm^(-1).`