The upper half of an inclined plane with inclination perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 63 views

A smooth block is released at rest on a 45° incline and then slides a distance d. The time taken to slide is n times as much to slide on a rough incline than on a smooth incline. What is the coefficient of friction? 

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 66 views

An annular ring with inner and outer radii R1 and R2 are rolling without slipping with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, F1 /F2 is

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 61 views

A block rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, then what is the mass of the block (in kg)? [take g = 10 m/s2]

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 56 views








A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves down with an acceleration of 5 m/s2, what will be the reading of the spring balance?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 70 views

Three forces start acting simultaneously on a particle moving with velocity . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 73 views

Three identical blocks of masses m 2 kg are drawn by a force F = 10.2 N with an acceleration of 0.6 ms –2 on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 136 views


One end of a massless rope passes over a massless and frictionless pulley P, which is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 960 N. With what value of maximum safe acceleration  can a man of 60 kg climb on the rope?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 53 views




A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m which applying the force and the ball goes upto 2 m height further, find the magnitude of the force. Consider g = 10 m/s2

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 1 Answer 62 views




In a multi­electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?

(i)  n=1,l=0,m=0

(ii)  n=2,l=0,m=0

(iii)  n=2,l=1,m=1

(iv)  n=3,l=2,m=1

(v)  n=3,l=2,m=0

Anonymous User Chemistry Structure of Atom 24 Mar, 2020 1 Answer 57 views