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A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km `h^(–1)`. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 m

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about 4.0 km `s^(–1)`, and that of P wave is 8.0 km `s^(–1)`. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A bat is flitting about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the bat is 40 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.03 times the speed of sound in air. What frequency does the bat hear reflected off the wall

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The two thigh bones (femurs), each of cross-sectional area 10 `cm^2` support the upper part of a human body of mass 40 kg. Estimate the average pressure sustained by the

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What is the pressure on a swimmer 10 m below the surface of a

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The density of the atmosphere at sea level is 1.29 kg/`m^3`. Assume that it does not change with altitude. Then how high would the atmosphere

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At a depth of 1000 m in an ocean (a) what is the absolute pressure? (b) What is the gauge pressure? (c) Find the force acting on the window of area 20 cm × 20 cm of a submarine at this depth, the interior of which is maintained at sealevel atmospheric pressure. (The density of sea water is `1.03 × 10^3` kg `m^(-3)`, g = 10 m

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Two syringes of different cross-sections (without needles) filled with water are connected with a tightly fitted rubber tube filled with water. Diameters of the smaller piston and larger piston are 1.0 cm and 3.0 cm respectively. (a) Find the force exerted on the larger piston when a force of 10 N is applied to the smaller piston. (b) If the smaller piston is pushed in through 6.0 cm, how much does the larger piston move

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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In a car lift compressed air exerts a force `F_1` on a small piston having a radius of 5.0 cm. This pressure is transmitted to a second piston of radius 15 cm (Fig ). If the mass of the car to be lifted is 1350 kg, calculate `F_1`. What is the pressure necessary to accomplish this task? (g = 9.8 m`s^(-2)`).

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Blood velocity: The flow of blood in a large artery of an anesthetised dog is diverted through a Venturi meter. The wider part of the meter has a cross sectional area equal to that of the artery.A = 8 `mm^2`. The narrower part has an area a = 4 `mm^2`. The pressure drop in the artery is 24 Pa. What is the speed of the blood in the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A fully loaded Boeing aircraft has a mass of `3.3 × 10^5`kg. Its total wing area is 500 `m^2`. It is in level flight with a speed of 960 km/h. (a) Estimate the pressure difference between the lower and upper surfaces of the wings (b)Estimate the fractional increase in the speed of the air on the upper surface of the wing relative to the lower surface. [The density of air is ρ = 1.2 kg

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A metal block of area 0.10 `m^2` is connected to a 0.010 kg mass via a string that passes over an ideal pulley (considered massless and frictionless), as in Fig. . A liquid with a film thickness of 0.30 mm is placed between the block and the table. When released the block moves to the right with a constant speed of 0.085 m `s^(-1)`. Find the coefficient of viscosity of the

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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 by varun (6.7k points)

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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 by varun (6.7k points)

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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

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

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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

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

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

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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 by varun (6.7k points)

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