Question

a vector lies in xy plane has magnitude 25 and x is 12 what is the angle makes with positive x-axis

Answer 1

LET THE VECTOR BE A
its magnitude is given 25
its  vectors components   in x axis and y axis are acosФ and asinФ resp. where Ф is the angle between x axis and the vector
given that acosФ=12
              25cosФ=12
              $Ф= cos^{-1} \frac{12}{25}$ ans...........