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Physics
Problem
Which one of the following expressions gives the magnitude
R
R
R
of a vector whose rectangular components are
R
x
R_x
R
x
and
R
y
R_y
R
y
? a)
R
=
R
x
+
R
y
R = R_x + R_y
R
=
R
x
+
R
y
b)
R
=
R
x
2
+
R
y
2
2
R = \dfrac{R_x^{2}+R_y^{2}}{2}
R
=
2
R
x
2
+
R
y
2
c)
R
=
R
x
2
+
R
y
2
R = \sqrt{R_x^{2}+R_y^{2}}
R
=
R
x
2
+
R
y
2
d)
R
=
R
x
2
+
R
y
2
2
R = \sqrt{\dfrac{R_x^{2}+R_y^{2}}{2}}
R
=
2
R
x
2
+
R
y
2
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