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A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other

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A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency 340 Hz) when the tube length is 25.5 cm or 79.3 cm. Estimate the speed of sound in air at the temperature of the experiment. The edge effects may be

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

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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

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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

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A structural steel rod has a radius of 10 mm and a length of 1.0 m. A 100 kN force stretches it along its length.Calculate (a) stress, (b) elongation, and (c) strain on the rod. Young’s modulus, of structural steel is `2.0 × 10^(11)` N

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

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In a human pyramid in a circus, the entire weight of the balanced group is supported by the legs of a performer who is lying on his back (as shown in Fig). The combined mass of all the persons performing the act, and the tables, plaques etc. involved is 280 kg. The mass of the performer lying on his back at the bottom of the pyramid is 60 kg. Each thighbone (femur) of this performer has a length of 50 cm and an effective radius of 2.0 cm. Determine the amount by which each thighbone gets compressed under the extra

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

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The edge of an aluminium cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall. A mass of 100 kg is then attached to the opposite face of the cube. The shear modulus of aluminium is 25 GPa. What is the vertical deflection of this

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

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Weighing the Earth : You are given the following data: g = 9.81 `ms^(–2)`,RE = `6.37×10^6` m, the distance to the moon R = `3.84×10^8` m and the time period of the moon’s revolution is 27.3 days. Obtain the mass of the Earth `M_E` in two different

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Let us assume that our galaxy consists of `2.5 × 10^(11)` stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution ? Take the diameter of the Milky Way to be `10^5`

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The escape speed of a projectile on the earth’s surface is 11.2 km `s^(-1)`. A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other

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Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centres of the spheres ? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable

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A disc rotating about its axis with angular speed `ω_o` is placed lightly (without any translational push) on a perfectly frictionless table. The radius of the disc is R. What are the linear velocities of the points A, B and C on the disc shown in Fig. ? Will the disc roll in the direction indicated ?

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Explain why friction is necessary to make the disc in Fig. roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins

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

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A solid disc and a ring, both of radius 10 cm are placed on a horizontal table simultaneously, with initial angular speed equal to 10 π rad `(s^-1)`. Which of the two will start to roll earlier ? The co-efficient of kinetic friction is `µ_k =

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Displacement vs. time curve for a particle executing S.H.M. is shown in Fig. Choose the correct

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Displacement versus time curve for a particle executing S.H.M. is shown in Fig. . Identify the points marked at which speed of the oscillator is

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The length of a second’s pendulum on the surface of Earth is 1m. What will be the length of a second’s pendulum on the

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Find the time period of mass M when displaced from its equilibrium positon and then released for the system shown in Fig

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Show that the motion of a particle represented by `y = sinω t – cos ω t` is simple harmonic with a period of

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

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