Question

Section-B
Q.15 and Q.16 ure case study based question and are compulsory. Attempted any 4 sub parts from
Each question carries i marks.
15. In the shown figure block A is 2 kg and block B is 3kg the coefficient of kinetic Inction between
block A and surface 0.25 Pulley and string are assumed to fully smooth and massies,
А
P
B
R
(A) What is the friction force of the surface PQ"
a) 973
b) 39/2
c) 5g/2
d) g/2
(BWhat is the tension in string?
*) 59/2
b) 39/2
d) g/4
(C) What is the acceleration of block A?
a) 9/2
D) Il a blocksplaced over the block A and acceleration of block A become zero then what is the
s) 5 kg
b) 3 kg
c) 0kg
E) What is the train in the pulley?
a) 39/2
by 5g/4
5) /
d) a/2
16. The positics of the particle is geen by x = 2(t-) where is expressed in cand and is
mette Positional direction is towards eh​

Answer 1

Answer:

Now if some or all of n things be taken at a time, then the number of combinations will be 2

n

- 1, as explained below. Each of the things can be taken or left, i.e. each gives 2 combinations. So the combinations of n things will be 2

n

.But this includes the case when all have been left. Hence the number of combinations will he 2

n

- 1

Section A : 3 questions, Section B: 4 questions; and one question from each section is compulsory i.e. all of a particular section cannot be left.

∴ 2

3

- 1 = 7, 2

4

-1 = 15

∴ Total is 7 x 15 = 105 by fundamental theorem.