ehaynie
10.10.2019 •
Mathematics
"vector a⃗ , which is shown in the figure, has a magnitude of 10 and a direction angle of 60º. what is the magnitude and direction angle (as measured counterclockwise from the positive x-axis) of −a⃗ /2?
-5, 60º
5, 240º
5, -30º
-5, -30º
-5, 240º"
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Ответ:
Magnitude of vector A=10
Direction angle of vector A=60°
-A/2 is a vector with magnitude equal to the half of the magnitude of the vector A and direction opposite to the direction of vector A, because the minus sign, then:
Magnitude of vector -A/2=Magnitude of vector A / 2 =10/2→
Magnitude of vector -A/2=5
Direction angle of vector -A/2=Direction angle of vector A + 180°=60°+180°→
Direction angle of vector -A/2=240°
Second option 5, 240°
Ответ:
i think the correct answer is f