Question

P1 and P2 are two position vectors making angle theta 1 and theta 2 with positive x. axis respectively. Find their vector product when P1=12cm and P2= 9cm and theta 1= 30° and theta 2=90°(where sin 60= √3/2)
A)37√7. B) 54√3. C)49√2. D)33√5. E)23√9

Answer 1

Answer:

54

Explanation:

P1 vector forms 30 degree with x- axis and P2 vector forms 90 degree with x-axis. So the angle between P1 and P2 vector is 90-30=60 degree.

P1.P2=(P1)(P2)cos(60)=(12)(9)(1/2)=54 cm^2