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The system is pushed by a force F as shown in fig. All surfaces are smooth except between B and C. Friction coefficient between B and C is μ.. Minimum value of F to prevent block B from down ward slipping is:
20
Oct
The system is pushed by a force F as shown in fig. All surfaces are smooth except between B and C. Friction coefficient between B and C is μ.. Minimum value of F to prevent block B from down ward slipping is: each of mass m. The system is released from rest. If accelerations of [...]
Two block of masses M1andM2 are connected with a string passing over a pulley as shown in figure The block M1 lies on a horizontal surface friction between the block M1 and the horizontal surface is μ The system accelerates. What additional mass m should be placed on the block M1 so that the system does not accelerate ?
20
Oct
Two block of masses M1andM2 are connected with a string passing over a pulley as shown in figure The block M1 lies on a horizontal surface friction between the block M1 and the horizontal surface is μ The system accelerates. What additional mass m should be placed on the block M1 so that the system [...]
A block of mass m is placed on another block of mass M, which itself is lying on a horizontal surface. The coefficient of friction between two blocks is u1 and that between the block of mass M and the horizontal surface is u2. What is maximum horizontal force can be applied to the lower block so that the two blocks move without separation?
20
Oct
A block of mass m is placed on another block of mass M, which itself is lying on a horizontal surface. The coefficient of friction between two blocks is u1 and that between the block of mass M and the horizontal surface is u2. What is maximum horizontal force can be applied to the lower [...]
Blocks A and B in the Fig are connected by a bar of negligible weight .Mass of each block is 170 kg and μA=0.2 and μB=0.4 where μA and μBare the coefficient of limiting friction between block and plane calculate the force developed in the bar(g=10ms^−2)
20
Oct
Blocks A and B in the Fig are connected by a bar of negligible weight .Mass of each block is 170 kg and μA=0.2 and μB=0.4 where μA and μBare the coefficient of limiting friction between block and plane calculate the force developed in the bar(g=10ms^−2) each of mass m. The system is released from [...]
A horizontal force, just sufficient to move a body of mass 4kg lying on a rough horizontal surface is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration of the block in ms^−2 is (g = 10 ms^−2 )
20
Oct
A horizontal force, just sufficient to move a body of mass 4kg lying on a rough horizontal surface is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration [...]
A box of mass 8kg placed on a rough inclined plane of inclination θ its downward motion can be prevented by applying an upward pull F and it can be made to slide upward applying a force 2F .The coefficient of friction between the box and the inclined plane is
19
Oct
A box of mass 8kg placed on a rough inclined plane of inclination θ its downward motion can be prevented by applying an upward pull F and it can be made to slide upward applying a force 2F .The coefficient of friction between the box and the inclined plane is each of mass m. The [...]
Figure shows two blocks, each of mass m. The system is released from rest. If accelerations of blocks A and B at any instant (not initially) are a1 and a2, respectively, then
19
Oct
Figure shows two blocks, each of mass m. The system is released from rest. If accelerations of blocks A and B at any instant (not initially) are a1 and a2, respectively, then each of mass m. The system is released from rest. If accelerations of blocks A and B at any instant (not initially) are [...]
Half-lives of two radioactive substances A and B are, respectively, 20 min and 40 min. Initially, the samples of A and B have equal number of nuclei. After 80 min, the ratio of the remaining number
18
Oct
Half-lives of two radioactive substances A and B are, respectively, 20 min and 40 min. Initially, the samples of A and B have equal number of nuclei. After 80 min, the ratio of the remaining number 20 min and 40 min. Initially Half-lives of two radioactive substances A and B are respectively the ratio of [...]
At any instant, the ratio of the amounts of two radioactive substances is 2:1. If their half-lives be, respectively, 12 h and 16 h, then after two days, what will be the ratio of the substances?
18
Oct
At any instant, the ratio of the amounts of two radioactive substances is 2:1. If their half-lives be, respectively, 12 h and 16 h, then after two days, what will be the ratio of the substances? 12 h and 16 h At any instant respectively the ratio of the amounts of two radioactive substances is [...]
In the case of thorium (A = 232 and Z = 90), we obtain an isotope of lead (A = 208 and Z = 82) after some radioactive disintegrations. The number of alpha and beta particles emitted are, respectively,
18
Oct
In the case of thorium (A = 232 and Z = 90), we obtain an isotope of lead (A = 208 and Z = 82) after some radioactive disintegrations. The number of alpha and beta particles emitted are, respectively, In the case of thorium (A = 232 and Z = 90) respectively we obtain an [...]