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Hello there. In lab, we measured vectors. I'm having a little concern on how to get X and Y. If I follow the books method, R_calc comes out too small compare to measure R. (Big % error).

X:

15.5+12.4cos37 = 25.4

Y:

0+9.3sin37 = 5.4

R:

square root of (25.4^2+5.4^2) = 26cm

If I do it my way, R is a lot closer to measure.

X:

15.3+12.4= 27.9cm

Y:

0 + 9.3 = 9.3 cm

R:

square root of (27.9^2+9.3^2) = 29.4 cm

The measurements (x1/2; y1/2; R m) are pretty accurate. What am I doing wrong? Thanks for any help.

Hello there. In lab, we measured vectors. I'm having a little concern on how to get X and Y. If I follow the books method, R_calc comes out too small compare to measure R. (Big % error).

X:

15.5+12.4cos37 = 25.4

Y:

0+9.3sin37 = 5.4

R:

square root of (25.4^2+5.4^2) = 26cm

If I do it my way, R is a lot closer to measure.

X:

15.3+12.4= 27.9cm

Y:

0 + 9.3 = 9.3 cm

R:

square root of (27.9^2+9.3^2) = 29.4 cm

The measurements (x1/2; y1/2; R m) are pretty accurate. What am I doing wrong? Thanks for any help.

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