Chapter 10 – COM, Momentum and Collision
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If kinetic energy of a body is increased by 300%, its momentum will increase by
22
Oct
If kinetic energy of a body is increased by 300%, its momentum will increase by If kinetic energy of a body is increased by 300% its momentum will increase by October 22, 2020 Category: Cengage NEET by C.P Singh , Chapter 10 - COM, Momentum and Collision , Part 1 ,
Two bodies with kinetic energies in the ratio 4:1 are moving with equal linear momentum. The ratio of their masses is
22
Oct
Two bodies with kinetic energies in the ratio 4:1 are moving with equal linear momentum. The ratio of their masses is Two bodies with kinetic energies in the ratio 4:1 are moving with equal linear momentum. The ratio of their masses is October 22, 2020 Category: Cengage NEET by C.P Singh , Chapter 10 - [...]
A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0, moving with a constant speed. Choose the correct option. (i) The speed of the person as seen from the ground is smaller than L/t0. (ii) The speed of the plank as seen from the ground is (m/m+M)L/t0. (iii) The speed of the plank as seen from the ground is (M/m+M)L/t0. (iv) The total K.E. of the system is 1/2(m+M)(Lt/0)^2.
22
Oct
A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0, moving with a constant speed. Choose the correct option. (i) The speed of the person as seen from the [...]
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A rod of length is 3m and its mass per unit length is directly proportional to distance x from one end the centre of gravity of the rod from that end will be at ,
A wooden plank of mass M and length L is floating in still water. A persons of mass m starts at one end of the plank and reaches to other end other end in time t0 ,
Two particles A and B of masses 2m and m are placed on a smooth surface at separation d. They move towards each other due to the mutual attractive force. (i) The particles will meet at distance d/3 from the initial position of mass 2m. (ii) The speed of A will be half of speed of B until the particles collide (excluding the initial speed). (iii) The distance covered by B is always double that covered by A until the particles collide. (iv) The velocity of center of mass is always zero.
22
Oct
Two particles A and B of masses 2m and m are placed on a smooth surface at separation d. They move towards each other due to the mutual attractive force. (i) The particles will meet at distance d/3 from the initial position of mass 2m. (ii) The speed of A will be half of speed [...]
A boy (massof40kg) is standing at one end of a boat (mass of 60 kg) in still water. The length of the boat is 10m and the boy takes 2s to reach at other end of boat moving with constant speed. Assuming no friction between the boat and the water. (i) The distance covered by the boat is 4m (ii) The distance covered by the boy with respect to the ground is 6m. (iii) The velocity of the boy with respect to the ground is
22
Oct
A boy (massof40kg) is standing at one end of a boat (mass of 60 kg) in still water. The length of the boat is 10m and the boy takes 2s to reach at other end of boat moving with constant speed. Assuming no friction between the boat and the water. (i) The distance covered by [...]
A boy of mass 40kg stands on a rail road car of mass 60kg, moving with velocity 10m/s. Now , the boy begins to run with velocity 5m/s , with respect to the car , in the same direction , the velocity of the car will be
22
Oct
A boy of mass 40kg stands on a rail road car of mass 60kg, moving with velocity 10m/s. Now , the boy begins to run with velocity 5m/s , with respect to the car , in the same direction , the velocity of the car will be A boy of mass 40kg stands on a [...]
Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when velocity of A is v and that of B is 2v, the velocity of centre of mass of the system is
22
Oct
Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when velocity of A is v and that of B is 2v, the velocity of centre of mass of the system is the velocity of centre of mass of the system is Two particles [...]
A cubical block of ice of mass m and edge L is placed in a large tray of mass M. If the ice melts, by what distance the centre of mass of the system ”ice plus tray” descend ?
22
Oct
A cubical block of ice of mass m and edge L is placed in a large tray of mass M. If the ice melts, by what distance the centre of mass of the system ”ice plus tray” descend ? A cubical block of ice of mass m and edge L is placed in a large [...]
The mass per unit length of a non – uniform rod of length L is given μ=λx^2 , where λ is a constant and x is distance from one end of the rod. The distance of the center of mas of rod from this end is
22
Oct
The mass per unit length of a non – uniform rod of length L is given μ=λx^2 , where λ is a constant and x is distance from one end of the rod. The distance of the center of mas of rod from this end is The mass per unit length of a non - [...]
Which of the following is true for center of mass ? (i) The center of mass of a body may lie within , outside , on the surface of the body. (ii) In the case of symmetrical bodies , the center of mass coincides with the geometrical center of the body. (iii) In the absence of external forces , the center of mass moves with constant velocity. (iv) If external forces are absent and system is initially at rest, then location of center of mass is fixed.
22
Oct
Which of the following is true for center of mass ? (i) The center of mass of a body may lie within , outside , on the surface of the body. (ii) In the case of symmetrical bodies , the center of mass coincides with the geometrical center of the body. (iii) In the absence [...]
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on the surface of the body. (ii) In the case of symmetrical bodies ,
outside ,
the center of mass coincides with the geometrical center of the body. (iii) In the absence of external forces ,
the center of mass moves with constant velocity. (iv) If external forces are absent and system is initially at rest ,
then location of center of mass is fixed. ,
Which of the following is true for center of mass ? (i) The center of mass of a body may lie within ,