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A cracker is thrown into air with a velocity of 10 m/s at an angle of 45∘ with the vertical. When it is at a height of 0.5m from the ground, it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass, when it is at a height of 1 m from the ground? (g = 10 m/s^2)
21
Sep
A cracker is thrown into air with a velocity of 10 m/s at an angle of 45∘ with the vertical. When it is at a height of 0.5m from the ground, it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass, when it is at [...]
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A cracker is thrown into air with a velocity of 10 m/s at an angle of 45∘ with the vertical. When it is at a height of 0.5m from the ground ,
it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass ,
when it is at a height of 1 m from the ground? (g = 10 m/s^2) ,
A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude 9.0 m/s. Find the motorcycle’s position, distance from the edge of the cliff and velocity after 0.5 s.
21
Sep
A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude 9.0 m/s. Find the motorcycle’s position, distance from the edge of the cliff and velocity after 0.5 s. A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his [...]
A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true?
21
Sep
A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true? A man stands at one end of the open truck which can run [...]
A shell is fired from a gun from the bottom of a hill along its slope. The slope of the hill is alpha = 30 and the angle of the barrel to the horizontal beta = 60. The initial velocity v of the shell is 21 m/s
21
Sep
A shell is fired from a gun from the bottom of a hill along its slope. The slope of the hill is alpha = 30 and the angle of the barrel to the horizontal beta = 60. The initial velocity v of the shell is 21 m/s A staircase contains three steps each 10 cm [...]
For a given velocity of projection from a point on the inclined plane, the maximum range down the plane is three times the maximum range up the incline. Then find the angle of inclination of the inclined plane.
21
Sep
For a given velocity of projection from a point on the inclined plane, the maximum range down the plane is three times the maximum range up the incline. Then find the angle of inclination of the inclined plane. For a given velocity of projection from a point on the inclined plane the maximum range down [...]
Two men ‘A’ and ‘B’ are standing on a plank. ‘B’ is at the middle of the plank and ‘A’ is at the left end of the plank. Lower surface of the plank is smooth. System is initially at rest and masses are as shown in Fig. ‘A’ and ‘B’ start moving such that the position of ‘B’ remains fixed with respect to ground, then ‘A’ meets ‘B’. Then the point where A meets B is located at
21
Sep
Two men ‘A’ and ‘B’ are standing on a plank. ‘B’ is at the middle of the plank and ‘A’ is at the left end of the plank. Lower surface of the plank is smooth. System is initially at rest and masses are as shown in Fig. ‘A’ and ‘B’ start moving such that the [...]
A car of mass m is initially at rest on the boat of mass M tied to the wall of dock through a massless, inextensible string. The car accelerates from rest to velocity v0 in times to. At t=t0 the car applies brake and comes to rest relative to the boat in negligible time. Neglect friction between the boat and water: the time ‘t’ at which boat will strike the wall is
21
Sep
A car of mass m is initially at rest on the boat of mass M tied to the wall of dock through a massless, inextensible string. The car accelerates from rest to velocity v0 in times to. At t=t0 the car applies brake and comes to rest relative to the boat in negligible time. Neglect [...]
A staircase contains three steps each 10 cm high and 20 cm wide. What should be the minimum horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane?
21
Sep
A staircase contains three steps each 10 cm high and 20 cm wide. What should be the minimum horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane? A staircase contains three steps each 10 cm high and 20 cm wide. What should be the minimum horizontal [...]
A block of mass M is tied to one end of a massless rope the other end of the rope is in the hands of a man of mass 2M as shown in the figure the block and the man are resting on a rough plank of mass M as shown in the figure the whole system is resting on a smooth horizontal surface the man pulls the rope pulley is massless and friction what is the displacement of the plank when the block meets the pulley ( Man does not leave his position on plank during the pull)
21
Sep
A block of mass M is tied to one end of a massless rope the other end of the rope is in the hands of a man of mass 2M as shown in the figure the block and the man are resting on a rough plank of mass M as shown in the figure the [...]
A man standing on the roof of a house of height h throws one particle vertically downwards and another particle horizontally with the same velocity u. Find the ration of their velocities when they reach
21
Sep
A man standing on the roof of a house of height h throws one particle vertically downwards and another particle horizontally with the same velocity u. Find the ration of their velocities when they reach both the balls stay in our view for the same period. Pankaj and Sudhir are playing with two different balls [...]