Physics
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If masses are released from the position shown in figure then time elapsed before mass m1 collides with the floor will be :



 None of these
The correct answer is:
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physics
A block A of mass m is placed over a plank B of mass 2m. Plank B is placed over a smooth horizontal surface. The coefficient of friction between A and B is 0.5. Block A is given a velocity v_{0} towards right. Acceleration of B relative to A is
A block A of mass m is placed over a plank B of mass 2m. Plank B is placed over a smooth horizontal surface. The coefficient of friction between A and B is 0.5. Block A is given a velocity v_{0} towards right. Acceleration of B relative to A is
physicsGeneral
physics
In figure shown, both blocks are released from rest. The time to cross each other
In figure shown, both blocks are released from rest. The time to cross each other
physicsGeneral
physics
A block A is placed over a long rough plank B of same mass as shown in figure. The plank is placed over a smooth horizontal surface. At time t=0, block A is given a velocity v_{0} in horizontal direction. Let and be the velocities of A and B at time t. Then choose the correct graph between or and t
A block A is placed over a long rough plank B of same mass as shown in figure. The plank is placed over a smooth horizontal surface. At time t=0, block A is given a velocity v_{0} in horizontal direction. Let and be the velocities of A and B at time t. Then choose the correct graph between or and t
physicsGeneral
physics
Three blocks A , B and C of equal mass m are placed one over the other on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A,B and C is The maximum value of mass of block D so that the blocks A, B and C move without slipping over each other is
Three blocks A , B and C of equal mass m are placed one over the other on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A,B and C is The maximum value of mass of block D so that the blocks A, B and C move without slipping over each other is
physicsGeneral
physics
For the system shown in the figure, the acceleration of the mass m_{4} immediately after the lower thread x is cut will be, (assume that the threads are weightless and inextensible, the spring are weightless, the mass of pulley is negligible and there is no friction)
For the system shown in the figure, the acceleration of the mass m_{4} immediately after the lower thread x is cut will be, (assume that the threads are weightless and inextensible, the spring are weightless, the mass of pulley is negligible and there is no friction)
physicsGeneral
physics
Given . The coefficient of friction between A and B = 0.3, between B and C = 0.2 and between C, and ground, = 0.1. The least horizontal force F to start motion of any part of the system of three blocks resting upon one another as shown in figure is ( g = 10 )
Given . The coefficient of friction between A and B = 0.3, between B and C = 0.2 and between C, and ground, = 0.1. The least horizontal force F to start motion of any part of the system of three blocks resting upon one another as shown in figure is ( g = 10 )
physicsGeneral
maths
mathsGeneral
maths
is equal to:
is equal to:
mathsGeneral
maths
If the chord through the points whose eccentric angles are and on the ellipse =1 passes through the focus (ae, 0), then the value of tan tan = 0 is –
If the chord through the points whose eccentric angles are and on the ellipse =1 passes through the focus (ae, 0), then the value of tan tan = 0 is –
mathsGeneral
physics
For a certain mass of a gas Isothermal relation between ‘P’ and ‘V’ are shown by the graphs at two different temperatures T_{1} and T_{2} then
For a certain mass of a gas Isothermal relation between ‘P’ and ‘V’ are shown by the graphs at two different temperatures T_{1} and T_{2} then
physicsGeneral
maths
mathsGeneral
maths
If the chord joining two points whose eccentric angles are and cuts the major axis of an ellipse + = 1 at a distance c from the centre, then tan . tan is equal to
If the chord joining two points whose eccentric angles are and cuts the major axis of an ellipse + = 1 at a distance c from the centre, then tan . tan is equal to
mathsGeneral
maths
P(a cos, b sin) is any point on the ellipse + = 1 Now if this ellipse is rotated anticlockwise by 90º and P reaches then coordinate of are 
P(a cos, b sin) is any point on the ellipse + = 1 Now if this ellipse is rotated anticlockwise by 90º and P reaches then coordinate of are 
mathsGeneral
maths
Normal to the ellipse intersects the major and minor axis at P and Q respectively then locus of the point dividing segment PQ in 2 : 1 is 
Equation of normal 8x sec – 7y cosec = 15
, Q
3h = , 3k =
cos = , sin =
hence locus = 1
, Q
3h = , 3k =
cos = , sin =
hence locus = 1
Normal to the ellipse intersects the major and minor axis at P and Q respectively then locus of the point dividing segment PQ in 2 : 1 is 
mathsGeneral
Equation of normal 8x sec – 7y cosec = 15
, Q
3h = , 3k =
cos = , sin =
hence locus = 1
, Q
3h = , 3k =
cos = , sin =
hence locus = 1
physics
Given graph gives variation of with P for 1gm of oxygen at two different temperatures T_{1} and T_{2}. If density of oxygen The value of at point A and relation
Given graph gives variation of with P for 1gm of oxygen at two different temperatures T_{1} and T_{2}. If density of oxygen The value of at point A and relation
physicsGeneral