Question

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Answer 1

Answer:

Explanation:

1 for a body being acted by 3 forces to be in equilibrium it is necessary that

1. largest force < sum of remaining two forces and

2. smallest force > mod of subtraction of remaining two forces.

in option 1. 5+3=8 which is less than 10. 1st condition violated

in 2nd option 7+4=11 which is less than 12, again 1st condition violated

in 3rd option 6+2=8 which is greater than 5 and 6-2=4 which is less than 5. hence both conditions satisfied.

so option 3 is correct.

2

1) Given two vectors of magnitude 3 and 5 units such that its resultant is perpendicular to that of 3 units.

Let both vectors are such that angle between them is

2) Making components of 5 units vector such that its horizontal component is equal to that of 3 units as shown in figure.

Hence, to make vectors of 3units and 5units such that their resultant is perpendicular to 3units vector, angle between them can be 127 degree.