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A thin rod of length `L` is bent to form a semicircle. The mass of rod is `M`. What will be the gravitational potential at the centre of the

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

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A particle is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done per unit mass against the gravitational force between them, to take the particle far away from the sphere (you may take `h=6.67 xx 10^(-11) Nm^2kg^(-2))`

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

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Figure (a) shows a spring of force constant k clamped rigidly at one end and a mass m attached to its free end. A force F applied at the free end stretches the spring. Figure (b) shows the same spring with both ends free and attached to a mass m at either end. Each end of the spring in Fig. (b) is stretched by the same force F. (a) What is the maximum extension of the spring in the two cases ? (b) If the mass in Fig. (a) and the two masses in Fig. (b)

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Show that for a particle in linear SHM the average kinetic energy over a period of oscillation equals the average potential energy over the same

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Given below are some functions of x and t to represent the displacement (transverse or longitudinal) of an elastic wave. State which of these represent (i) a travelling wave, (ii) a stationary wave or (iii) none at all: (a) y = 2 cos (3x) sin (10t) (b) `y = 2sqrt(x-vt)` (c) y = 3 sin (5x – 0.5t) + 4 cos (5x – 0.5t) (d) y = cos x sin t + cos 2x sin

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

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

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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 /

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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 by varun (6.7k points)

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A cord of negligible mass is wound round the rim of a fly wheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord as shown in Fig. . The flywheel is mounted on a horizontal axle with frictionless bearings. (a) Compute the angular acceleration of the wheel. (b) Find the work done by the pull, when 2m of the cord is unwound. (c) Find also the kinetic energy of the wheel at this point. Assume that the wheel starts from rest. (d) Compare answers to parts (b) and (c).

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

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As shown in Fig., the two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be friction-less and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take g = 9.8 m/`s^2`) (Hint: Consider the equilibrium of each side of the ladder separately.)

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

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A book with many printing errors contains four different formulas for the displacement y of a particle undergoing a certain periodic motion : (a) y = a sin 2π t/T (b) y = a sin vt (c) y = (a/T) sin t/a (d) y`(asqrt2)`(sin 2πt/T + cos 2πt/T ) (a = maximum displacement of the particle, v = speed of the particle. T = time-period of motion). Rule out the wrong formulas on dimensional

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

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Write S.I unit of luminous intensity and

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Match the Column I (unit) with Column II (value) and select the correct option from the codes given below Column I Column II A. 1 are p. `200 mg` B. 1 bar q. `1.013 xx 10^5 Pa` C. 1 carat r. `10^2 m^2`

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

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A particle starts from origin at `t= 0` with a velocity `5.0 hati ms^(-1)` and moves in `xy`-plane under action of force which produces a constant acceleration of `(3.0 hati + 2.0 hatj) ms^(-2)`. What is the `y`-coordinate of the particle at the instant, if `x`-coordinate is `84

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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Newton’s law of gravitation is universal

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If the gravitation force on body 1 due to 2 is given by `F_(12)` and on body 2 due to 1 is given as `F_(21)`,

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

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A point mass `m` is placed outside a hollow spherical shell of mass `M` and uniform density at a distance `d` from centre of the sphere as shown in figure. Gravitational force on point mass `m` at `P`

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

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During the free fall of an

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What will happen to the weight of the body at the south-pole, if the earth stops rotating about its polar

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

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