Soru
Two vectors are given by overrightarrow (A)=2overrightarrow (i)+3overrightarrow (j) and overrightarrow (B)=4overrightarrow (i)-3overrightarrow (j) Find: (a) the magnitude and direction of the vector sum overrightarrow (R)=overrightarrow (A)+overrightarrow (B) (b) the magnitude and direction of the vector difference overrightarrow (S)=overrightarrow (A)-overrightarrow (B)
Çözüm
4.2
(318 Oylar)
Leman
Usta · 5 yıl öğretmeni
Uzman doğrulaması
Cevap
(a) To find the magnitude and direction of the vector sum
, we first calculate the sum of the two vectors:
The magnitude of
is given by the square root of the sum of the squares of its components:
The direction of
is along the positive x-axis since it has no y-component.(b) To find the magnitude and direction of the vector difference
, we calculate the difference of the two vectors:
The magnitude of
is given by the square root of the sum of the squares of its components:
The direction of
is 126.87 degrees counterclockwise from the positive x-axis, which can be calculated using the arctangent function:
Since the direction is negative, we add 360 degrees to get the positive angle:
Therefore, the magnitude and direction of the vector sum
are 6 and along the positive x-axis, respectively. The magnitude and direction of the vector difference
are
and 126.87 degrees counterclockwise from the positive x-axis, respectively.