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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 =

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

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A cylinder of mass 10 kg and radius 15 cm is rolling perfectly on a plane of inclination 30°. The coefficient of static friction `µ_s` = 0.25. (a) How much is the force of friction acting on the cylinder ? (b) What is the work done against friction during rolling ? (c) If the inclination θ of the plane is increased, at what value of θ does the cylinder begin to skid, and not roll perfectly

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

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Read each statement below carefully, and state, with reasons, if it is true or false;(a) During rolling, the force of friction acts in the same direction as the direction of motion of the CM of the body. (b) The instantaneous speed of the point of contact during rolling is zero. (c) The instantaneous acceleration of the point of contact during rolling is zero. (d) For perfect rolling motion, work done against friction is zero. (e) A wheel moving down a perfectly frictionless inclined plane will undergo slipping (not rolling)

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

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Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : Show `p=p'_1+m_iV` where pi is the momentum of the ith particle (of mass `m_i`) and `p′_i = m_iv′_i`. Note `v′_i` is the velocity of the ith

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

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Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : Show K=K'+1/2M`V^2` where K is the total kinetic energy of the system of particles, K′ is the total kinetic energy of the system when the particle

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

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Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : Show where `L'=r'_1xxp'_1` is the angular momentum of the system about the centre of mass with velocities taken relative to the centre of mass. Remember `r'1=r_1-R`;

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

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Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : Show `(dL')/(dt)=sum r'_1xx(dp')/(dt)` Further, show that `(dL')/(dt)=τ'_(ext)` where `τ'_(ext)` is the sum of all external torques acting on the system about the centre of mass. (Hint

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

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Using Euler’s formula, find the value of unknown x, y, z, p, q, r, in the following table. (i) (ii) (iii) (iv) (v) (vi) Faces 7 y 9 p 6 8 Vertices 10 12 z 6 q 11 Edges x 18 16 12 12 r

asked Jan 18, 2022 in 8th-maths by Simran (1.8k points)

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Can a polyhedron have V = F = 9 and E = 16 ? If yes, draw its

asked Jan 18, 2022 in 8th-maths by Simran (1.8k points)

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Check whether a polyhedron can have V = 12, E = 6 and F =

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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A polyhedron has 60 edges and 40 vertices. Find the number of its

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Look at the map given below. Now answer the following questions. (a) Name the roads that meet at round about. (b) What is the address of the stadium? (c) On which road is the Police Station situated? (d) If Ritika stays adjacent to bank and you have to send her a card, what address will you write? (e) Which sector has maximum number of houses? (f) In which sector is Fire Station located? (g) In the map, how many sectors have been

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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Using Euler’s formula, find the value of unknown x, y, z, p, q, r, in the following table. (i) (ii) (iii) (iv) (v) (vi) Faces 7 y 9 p 6 8 Vertices 10 12 z 6 q 11 Edges x 18 16 12 12 r

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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Can a polyhedron have V = F = 9 and E = 16 ? If yes, draw its

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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Check whether a polyhedron can have V = 12, E = 6 and F =

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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A polyhedron has 60 edges and 40 vertices. Find the number of its

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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Look at the map given below. Now answer the following questions. (a) Name the roads that meet at round about. (b) What is the address of the stadium? (c) On which road is the Police Station situated? (d) If Ritika stays adjacent to bank and you have to send her a card, what address will you write? (e) Which sector has maximum number of houses? (f) In which sector is Fire Station located? (g) In the map, how many sectors have been

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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