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Explain why The climate of a harbour town is more temperate than that of a town in a desert at the same

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Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP. Take the diameter of an oxygen molecule to be 3

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Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a

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Fig. depicts four x-t plots for linear motion of a particle. Which of the plots represent periodic motion? What is the period of motion (in case of periodic motion) ?

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Estimate the speed of sound in air at standard temperature and pressure. The mass of 1 mole of air is `29.0 ×10^(–3)`

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A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7 km `s^(–1)` ? The operating frequency of the scanner is 4.2

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

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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

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A steel wire of length 4.7 m and cross-sectional area `3.0 × 10^(-5)` `m^2` stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of `4.0 × 10^(–5)` `m^2` under a given load. What is the ratio of the Young’s modulus of steel to that of

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A rigid bar of mass 15 kg is supported symmetrically by three wires each 2.0 m long.Those at each end are of copper and the middle one is of iron. Determine the ratios of their diameters if each is to have the same

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The Marina trench is located in the Pacific Ocean, and at one place it is nearly eleven km beneath the surface of water. The water pressure at the bottom of the trench is about `1.1 × 10^8` Pa. A steel ball of initial volume 0.32 m3 is dropped into the ocean and falls to the bottom of the trench. What is the change in the volume of the ball when it reaches to the

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A 400 kg satellite is in a circular orbit of radius `2R_E` about the Earth. How much energy is required to transfer it to a circular orbit of radius `4R_E` ? What are the changes in the kinetic and potential energies

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

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(a) Prove the theorem of perpendicular axes. (Hint : Square of the distance of a point (x, y) in the x–y plane from an axis through the origin and perpendicular to the plane is `x^2+y^2`). (b) Prove the theorem of parallel axes. (Hint : If the centre of mass is chosen to be the origin `m_ir_i = 0`

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The rotation of earth about its axis

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When will the motion of a simple pendulum be simple

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In Fig. , what will be the sign of the velocity of the point P′ , which is the projection of the velocity of the reference particle P . P is moving in a circle of radius R in anticlockwise directio

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Find the displacement of a simple harmonic oscillator at which its P.E. is half of the maximum energy of the

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