A force (6i + 8j) N sets a particle of mass 2kg in motion. The acceleration of the particle is: (AJ Sms [B] |C) 7ms IDI During a direct impact between two spheres, if e is the coefficient of restitution, then the collision is said to be perfectly clastic if: e=0 0
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
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Answer 38, 39 40
![34.
The sine of'the angle between the line
r= 2i-j+3k +/(5i+3j+ 2k)• and the plane
r.(i+2j-k) = 15 is:
38.
A force (6i + 8j) N sets a particle of mass 2kg in motion.
The acceleration of the particle is:
(AJ Sms
9.
(A]
V38
[B]
5
9
|C]
7ms
(B]
J228
ms
[C]
During a direct impact between two spheres, if e is the
coellicient of restitution, then the collision is said to be
39.
[D]
V38
per fectly elastic if:
35.
Let p and g be two statements given by:
IBI
e = 0
[C)
IDI
The velocity of separation of two spheres is 4ms and
0<e< 1
p: Elsa is a hardworking student.
9: Elsa will succeed in her examination
The statement "it is not true that if Elsa is I ardworking.
then she will pass her exams" can be logicall, represented
Osesl
40.
their velocity of approach is 6ms". The coefficient of
restitution is:
as:
[B]
- p=-9
(B]
[C]
pv -9
[D]
pA -9
[C]
36.
Three forces act on a particle. Given that the fe rces are
(4i - j)N.(2i+4j)N, and (-3i- 2j)N, th:e juilibrant to
[D]
thare Cor
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