Question

Unit 1A
1. Que. If two forces of magnitude P and 2P ac
on a body, then their minimum resultant is
A 2P
В. ЗР
C. P
D. 4P
Ans.​

Answer 1

Answer:

R=P=[P

2

+Q

2

+2PQcosθ]

1/2

Q

2

+2PQcosθ=0

Q+2Pcosθ=0......{1}

let the angle between resultant of 2P and Q be α

tanα=

Q+2Pcosθ

2Psinθ

from equation 1

tanα=∞→α=90