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

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Find the centre of mass of a uniform L-shaped lamina (a thin flat plate) with dimensions as shown. The mass of the lamina is 3

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

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Find the scalar and vector products of two vectors. `a=(3hati-4hatj+5hat)` and

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

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Find the torque of a force `7hati+3hatj-4hatk` about the origin. The force acts on a particle whose position vector is

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

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Show that the angular momentum about any point of a single particle moving with constant velocity remains constant throughout the

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

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Show that moment of a couple does not depend on the point about which you take the

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

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A metal bar 70 cm long and 4.00 kg in mass supported on two knife-edges placed 10 cm from each end. A 6.00 kg load is suspended at 30 cm from one end. Find the reactions at the knifeedges.(Assume the bar to be of uniform cross section and

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

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A 3m long ladder weighing 20 kg leans on a frictionless wall. Its feet rest on the floor 1 m from the wall as shown in Fig.. Find the reaction forces of the wall and the floor.

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

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The angular speed of a motor wheel is increased from 1200 rpm to 3120 rpm in 16 seconds. (i) What is its angular acceleration, assuming the acceleration to be uniform? (ii) How many revolutions does the engine make during this

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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Three bodies, a ring, a solid cylinder and a solid sphere roll down the same inclined plane without slipping. They start from rest. The radii of the bodies are identical. Which of the bodies reaches the ground with maximum

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

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Give the location of the centre of mass of a (i) sphere, (ii) cylinder, (iii) ring, and (iv) cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body

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

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In the HC1 molecule, the separation between the nuclei of the two atoms is about 1.27 Å (1 Å = `10^(-10)` m). Find the approximate location of the CM of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its

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

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A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system

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

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Show that the area of the triangle contained between the vectors a and b is one half of the magnitude of a ×

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Show that a.(b × c) is equal in magnitude to the volume of the parallelepiped formed on the three vectors , a, b and

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Find the components along the x, y, z axes of the angular momentum l of a particle, whose position vector is r with components x, y, z and momentum is p with components px, py and pz. Show that if the particle moves only in the x-y plane the angular momentum has only a

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

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Two particles, each of mass m and speed v, travel in opposite directions along parallel lines separated by a distance d. Show that the vector angular momentum of the two particle system is the same whatever be the point about which the angular momentum is

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

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A non-uniform bar of weight W is suspended at rest by two strings of negligible weight as shown in Fig.. The angles made by the strings with the vertical are 36.9° and 53.1° respectively. The bar is 2 m long. Calculate the distance d of the centre of gravity of the bar from its left end.

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

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A car weighs 1800 kg. The distance between its front and back axles is 1.8 m. Its centre of gravity is 1.05 m behind the front axle. Determine the force exerted by the level ground on each front wheel and each back

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

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