Question

24.
If the resultant of two forces of magnitudes P and 2P is perpendicular to P, then the angle between the
npi/3
forces is
then value of n is?
​

Answer 1

Answer:

The angle between the forces is 120°.

Explanation:

Given that,

First vector = P

Second vector = 2P

Let R be the magnitude of resultant.

Let Ф be the angle between R and 2P.

Using cosine rule

The magnitude of resultant P and 2P is

Now,

The angle between the forces is

Hence, The angle between the forces is 120°.

Explanation: