Questions by varun

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The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at `20^o`C is 6.5 cm `s^(-1)`. Compute the viscosity of the oil at `20^o`C. Density of oil is `1.5 ×10^3` kg `m^(-3)`, density of copper is `8.9 × 10^3` kg

asked Mar 19, 2022 in 11th Physics

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The flow rate of water from a tap of diameter 1.25 cm is 0.48 L/min. The coefficient of viscosity of water is `10^(-3)` Pa s. After sometime the flow rate is increased to 3 L/min. Characterise the flow for both the flow

asked Mar 19, 2022 in 11th Physics

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The lower end of a capillary tube of diameter 2.00 mm is dipped 8.00 cm below the surface of water in a beaker. What is the pressure required in the tube in order to blow a hemispherical bubble at its end in water? The surface tension of water at temperature of the experiments is `7.30×10^(-2)` N`m^(-1)`. 1 atmospheric pressure =`1.01 × 10^5` Pa, density of water = 1000 kg/`m^3`, g = 9.80 m `s^(-2)`. Also calculate the excess

asked Mar 19, 2022 in 11th Physics

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Explain why The blood pressure in humans is greater at the feet than at the brain

asked Mar 19, 2022 in 11th Physics

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Explain why Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km

asked Mar 19, 2022 in 11th Physics

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Explain why Hydrostatic pressure is a scalar quantity even though pressure is force divided by

asked Mar 19, 2022 in 11th Physics

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Explain why The angle of contact of mercury with glass is obtuse, while that of water with glass is

asked Mar 19, 2022 in 11th Physics

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Explain why Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does

asked Mar 19, 2022 in 11th Physics

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Explain why Surface tension of a liquid is independent of the area of the

asked Mar 19, 2022 in 11th Physics

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Explain why Water with detergent disolved in it should have small angles of

asked Mar 19, 2022 in 11th Physics

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Explain why A drop of liquid under no external forces is always spherical in

asked Mar 19, 2022 in 11th Physics

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Fill in the blanks using the word(s) from the list appended with each statement: Surface tension of liquids generally ... with temperatures (increases /

asked Mar 19, 2022 in 11th Physics

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Fill in the blanks using the word(s) from the list appended with each statement: Viscosity of gases ... with temperature, whereas viscosity of liquids ... with temperature (increases /

asked Mar 19, 2022 in 11th Physics

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Fill in the blanks using the word(s) from the list appended with each statement: For solids with elastic modulus of rigidity, the shearing force is proportional to ... , while for fluids it is proportional to ... (shear strain / rate of shear

asked Mar 19, 2022 in 11th Physics

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Fill in the blanks using the word(s) from the list appended with each statement: For a fluid in a steady flow, the increase in flow speed at a constriction follows (conservation of mass / Bernoulli’s

asked Mar 19, 2022 in 11th Physics

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Fill in the blanks using the word(s) from the list appended with each statement: For the model of a plane in a wind tunnel, turbulence occurs at a ... speed for turbulence for an actual plane (greater /

asked Mar 19, 2022 in 11th Physics

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Explain why To keep a piece of paper horizontal, you should blow over, not under,

asked Mar 19, 2022 in 11th Physics

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Explain why When we try to close a water tap with our fingers, fast jets of water gush through the openings between our

asked Mar 19, 2022 in 11th Physics

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Explain why The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an

asked Mar 19, 2022 in 11th Physics

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Explain why A fluid flowing out of a small hole in a vessel results in a backward thrust on the

asked Mar 19, 2022 in 11th Physics

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