P-BLOCK

The probability of the number of permutations of the letters AAAABBBC in which the A's appear together in a block of four letters or the B's appear in a block of three letters is p then 770p is equal to …….

In the figure shown, there is friction between the blocks P and Q but the constact between the block Q and lower surface is frictionless. Initially the block Q with block P over it lies at x = 0, with spring at its natural length. The block Q is pulled to right and then released. As the spring -blocks system undergoes SHM with amplitude A, the block P tends to slip over Q, P is more likely to slip at

Match List I ( atomic number of the element ) with List II ( position in the periodic table ) and select the correct answer using the codes given below the lists - {:(,List" "I,,,List" "II),((a),52,,(p),s-block),((b),56,,(q),p-block),((c ),57,,(r),d-block),((d ),60,,(s),f-block):}

A block of mass m is supported on a rough wall by applying a force in figure Coefficient of static friction between block and wall is mu For what range of value of p , the block remain in static equilibrium ?

A block P of mass m is placed on a smooth horizontal surface. A block Q of the same mass is placed over the block P and the coefficient of static friction between them is mu . A spring of spring constant K is attached to block Q. The blocks are displaced together to a distance A and released. The upper block oscillates without slipping over the lower block. The maximum frictional force between the block is:

In Fig block 1 is placed on top of block 2 .Both of then have a mass of 1 kg The coefficient of friction between block 1 and 2 are mu_(s) = 0.75 and mu_(k) = 0.60 The table is frictionless A force p//2 is applied on block 1 in the left and force P on block 2 to the right .Find the minimum value of p such that sliding accore between the two blocks

In the long or modern form of the periodic table, the element in the periodic table have been divided into four blocks, s-p-d -and f -. Each period begins with the filling of new energy shell. Two series of f -block elements are placed at the bottom of the periodic table. The last element of the p -block in the present periodic table is represented by the configuration, where [X] represents inert gas is

Write the general outer electronic configuration of s- , p- , d- and f-block elements.

Examples of elements belonging to s, p, d or f-block are given below. Identify the wrong example.

A block P of mass m is placed on horizontal frictionless plane. A second block of same mass m is placed on it and is connected to a spring of spring constant k, the two blocks are pulled by distance A. Block Q oscillates without slipping. What is the maximum value of frictional force between the two blocks.