Physics-
General
Easy
Question
A 1 kg block is given a velocity of 15 m/s towards right over a very long rough plank of mass 2 kg as shown in figure. The correct graph showing linear momentum of 1 kg (i.e. 
) and of 2kg (i.e. 
) versus time is
The correct answer is:
Related Questions to study
physics-
Two blocks of equal mass m are connected by an unstretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure. If the extension of the spring is 
at time t, then the displacement of the second block at this instant is :-
Two blocks of equal mass m are connected by an unstretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure. If the extension of the spring is at time t, then the displacement of the second block at this instant is :-
physics-General
physics-
Two blocks of equal mass m are connected by an Un stretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure. If the extension of the spring is at time t, then the displacement of the first block at this instant is :
Two blocks of equal mass m are connected by an Un stretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure. If the extension of the spring is at time t, then the displacement of the first block at this instant is :
physics-General
physics-
Two blocks of equal mass m are connected by an unstretched spring, and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure Then the displacement of the centre of mass at time t is:-
Two blocks of equal mass m are connected by an unstretched spring, and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block pulling it away from the other as shown in figure Then the displacement of the centre of mass at time t is:-
physics-General
physics-
An initially stationary box on a frictionless floor explodes into two pieces, piece A with mass 
and piece B with mass 
. Two pieces then move across the floor along x–axis. Graph of position versus time for the two pieces are given If all the graphs are possible then, in which of the following cases external force must be acting on the box :-
An initially stationary box on a frictionless floor explodes into two pieces, piece A with mass and piece B with mass . Two pieces then move across the floor along x–axis. Graph of position versus time for the two pieces are given If all the graphs are possible then, in which of the following cases external force must be acting on the box :-
physics-General
physics-
An initially stationary box on a frictionless floor explodes into two pieces, piece A with mass and piece B with mass . Two pieces then move across the floor along x–axis. Graph of position versus time for the two pieces are given. Which graphs pertain to physically possible explosions ?
An initially stationary box on a frictionless floor explodes into two pieces, piece A with mass and piece B with mass . Two pieces then move across the floor along x–axis. Graph of position versus time for the two pieces are given. Which graphs pertain to physically possible explosions ?
physics-General
physics-
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by 
Here 
is the relative velocity with which the mass dm either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/s. Total mass of gas is 20 kg. Coefficient of friction between the car and road is 
= 0.1 Car will stop after (from starting) t = .... seconds :
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by Here is the relative velocity with which the mass dm either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/s. Total mass of gas is 20 kg. Coefficient of friction between the car and road is = 0.1 Car will stop after (from starting) t = .... seconds :
physics-General
physics-
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by Here is the relative velocity with which the mass dm either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/total mass of gas is 20 kg. Coefficient of friction between the car and road is = 0.1 Maximum speed of car will be v = ..... m/s 
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by Here is the relative velocity with which the mass dm either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/total mass of gas is 20 kg. Coefficient of friction between the car and road is = 0.1 Maximum speed of car will be v = ..... m/s
physics-General
physics-
The minimum audible wavelength at room temperature is about
The minimum audible wavelength at room temperature is about
physics-General
physics-
Two open organ pipes gives 4 beats/sec when sounded together in their fundamental nodes. If the length of the pipe are 
and 
respectively, then the velocity of sound is :
Two open organ pipes gives 4 beats/sec when sounded together in their fundamental nodes. If the length of the pipe are and respectively, then the velocity of sound is :
physics-General
physics-
An earthquake generates both transverse (s) and longitudinal (p) sound waves in the earth. The speed of S waves is about 4.5 m/s and that of 
waves is about 8.0 km/s. A seismograph records P and 
waves from an earthquake. The first pPwave arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about
An earthquake generates both transverse (s) and longitudinal (p) sound waves in the earth. The speed of S waves is about 4.5 m/s and that of waves is about 8.0 km/s. A seismograph records P and waves from an earthquake. The first pPwave arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about
physics-General
physics-
A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is vm/ sec. The speed of source will be
A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is vm/ sec. The speed of source will be
physics-General
physics-
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by Here is the relative velocity with which the mass d m either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/total mass of gas is 20 kg. Coefficient of friction between the car and road is = 0.1 Car will start moving after time t = . .. second:
When the mass of a system is variable, a thrust force has to be applied on it in addition to all other forces acting on it. This thrust force is given by Here is the relative velocity with which the mass d m either enters or leaves the system. A car has total mass 50 kg. Gases are ejected from this backwards with relative velocity 20 m/s. The rate of ejection of gas is 2 kg/total mass of gas is 20 kg. Coefficient of friction between the car and road is = 0.1 Car will start moving after time t = . .. second:
physics-General
physics-
In an oblique collision component parallel to common tangent remains unchanged while along common normal direction, relative velocity of separation becomes e times the relative velocity of approach. A ball collides at B with velocity 10 m/s at 30° with vertical. There is a flag at A and a wall at C. Collision of ball with ground is perfectly inelastic (e = 0) and that with wall is elastic (e = 1). Given AB = BC = 10m. The ball will collide with the flag after time t = ....s
In an oblique collision component parallel to common tangent remains unchanged while along common normal direction, relative velocity of separation becomes e times the relative velocity of approach. A ball collides at B with velocity 10 m/s at 30° with vertical. There is a flag at A and a wall at C. Collision of ball with ground is perfectly inelastic (e = 0) and that with wall is elastic (e = 1). Given AB = BC = 10m. The ball will collide with the flag after time t = ....s
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physics-
If net force on a system in a particular direction is zero (say in horizontal direction) we can apply: 
Here R stands for the masses which are moving towards right and L for the masses towards left, x is displacement, v is velocity and a the acceleration (all with respect to ground). A small block of mass m = 1 kg is placed over a wedge of mass M = 4 kg as shown in figure. Mass m is released from rest. All surfaces are smooth. Origin O is as shown. At the same instant reaction on the wedge from the ground is N
If net force on a system in a particular direction is zero (say in horizontal direction) we can apply: Here R stands for the masses which are moving towards right and L for the masses towards left, x is displacement, v is velocity and a the acceleration (all with respect to ground). A small block of mass m = 1 kg is placed over a wedge of mass M = 4 kg as shown in figure. Mass m is released from rest. All surfaces are smooth. Origin O is as shown. At the same instant reaction on the wedge from the ground is N
physics-General
physics-
If net force on a system in a particular direction is zero (say in horizontal direction) we can apply: Here R stands for the masses which are moving towards right and L for the masses towards left, x is displacement, v is velocity and a the acceleration (all with respect to ground). A small block of mass m = 1 kg is placed over a wedge of mass M = 4 kg as shown in figure. Mass m is released from rest. All surfaces are smooth. Origin O is as shown. Normal reaction between the two blocks at an instant when absolute acceleration of m is 
m/s2 at 60° with horizontal is N. Normal reaction at this instant is making 
with horizontal:
If net force on a system in a particular direction is zero (say in horizontal direction) we can apply: Here R stands for the masses which are moving towards right and L for the masses towards left, x is displacement, v is velocity and a the acceleration (all with respect to ground). A small block of mass m = 1 kg is placed over a wedge of mass M = 4 kg as shown in figure. Mass m is released from rest. All surfaces are smooth. Origin O is as shown. Normal reaction between the two blocks at an instant when absolute acceleration of m is m/s2 at 60° with horizontal is N. Normal reaction at this instant is making with horizontal:
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