Questions by varun

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Explain why A spinning cricket ball in air does not follow a parabolic

asked Mar 19, 2022 in 11th Physics

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A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor

asked Mar 19, 2022 in 11th Physics

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Toricelli’s barometer used mercury. Pascal duplicated it using French wine of density 984 kg `m^(–3)`. Determine the height of the wine column for normal atmospheric

asked Mar 19, 2022 in 11th Physics

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A vertical off-shore structure is built to withstand a maximum stress of `10^9` Pa. Is the structure suitable for putting up on top of an oil well in the ocean ? Take the depth of the ocean to be roughly 3 km, and ignore ocean

asked Mar 19, 2022 in 11th Physics

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A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425 `cm^2`. What maximum pressure would the smaller piston have to bear

asked Mar 19, 2022 in 11th Physics

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A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit

asked Mar 19, 2022 in 11th Physics

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In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury =

asked Mar 19, 2022 in 11th Physics

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Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli’s equation ?

asked Mar 19, 2022 in 11th Physics

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Glycerine flows steadily through a horizontal tube of length 1.5 m and radius 1.0 cm. If the amount of glycerine collected per second at one end is `4.0 × 10^(–3)` kg `s^(–1)` , what is the pressure difference between the two ends of the tube ? (Density of glycerine = `1.3 × 10^(–3)` kg `m^(–3)` and viscosity of glycerine = 0.83 Pa s). [You may also like to check if the assumption of laminar flow in the tube is

asked Mar 19, 2022 in 11th Physics

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In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m `s^(–1)` and 63 m `s^(–1)` respectively. What is the lift on the wing if its area is 2.5 `m^2` ? Take the density of air to be 1.3 kg

asked Mar 19, 2022 in 11th Physics

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Figures (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?

asked Mar 19, 2022 in 11th Physics

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The cylindrical tube of a spray pump has a cross-section of 8.0 `cm^2` one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m mi`n^(–1)`, what is the speed of ejection of the liquid through the holes

asked Mar 19, 2022 in 11th Physics

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A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of `1.5 × 10^(–2)` N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film

asked Mar 19, 2022 in 11th Physics

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Figure (a) shows a thin liquid film supporting a small weight = `4.5 × 10^(–2)` N. What is the weight supported by a film of the same liquid at the same temperature in Fig. (b) and (c) ? Explain your answer physically.

asked Mar 19, 2022 in 11th Physics

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What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature ? Surface tension of mercury at that temperature (20 °C) is `4.65 × 10^(–1)` N `m^(–1)`. The atmospheric pressure is `1.01 × 10^5` Pa. Also give the excess pressure inside the

asked Mar 19, 2022 in 11th Physics

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What is the excess pressure inside a bubble of soap solution of radius 5.00 mm, given that the surface tension of soap solution at the temperature (20 °C) is `2.50 × 10^(–2)` N `m^(–1)` ? If an air bubble of the same dimension were formed at depth of 40.0 cm inside a container containing the soap solution (of relative density 1.20), what would be the pressure inside the bubble ? (1 atmospheric pressure is `1.01 × 10^5`

asked Mar 19, 2022 in 11th Physics

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A tank with a square base of area 1.0 `m^2` is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area 20 `cm^2`. The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. compute the force necessary to keep the door

asked Mar 19, 2022 in 11th Physics

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A manometer reads the pressure of a gas in an enclosure as shown in Fig. (a) When a pump removes some of the gas, the manometer reads as in Fig. 10.25 (b) The liquid used in the manometers is mercury and the atmospheric pressure is 76 cm of mercury. (a) Give the absolute and gauge pressure of the gas in the enclosure for cases (a) and (b), in units of cm of mercury. (b) How would the levels change in case (b) if 13.6 cm of water (immiscible with mercury) are poured into the right limb of the manometer

asked Mar 19, 2022 in 11th Physics

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Two vessels have the same base area but different shapes. The first vessel takes twice the volume of water that the second vessel requires to fill upto a particular common height. Is the force exerted by the water on the base of the vessel the same in the two cases ? If so, why do the vessels filled with water to that same height give different readings on a weighing scale

asked Mar 19, 2022 in 11th Physics

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During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein ? [Use the density of whole blood from Table

asked Mar 19, 2022 in 11th Physics

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