bisa pake keseimbangan rotasi....
berarti sigma B = 0
t. A x cos tetha x 30 = t. A x sin tetha x 20 + t .A x cos tetha x 1/2 x 30
t. A x cos tetha x 30 = t A x sin tetha x 20 + t.A x cos tetha x 15
(t. A x cos tetha x 30 - t. A x cos tetha x 15) = t. A x sin tetha x 20
t. A x cos tetha x 15 = t. A x sin tetha x 20
15 cos tetha = 20 sin tetha
3 cos tetha = 4 sin tetha
cos tetha = 4/3 sin tetha
tan tetha = sin tetha / cos tetha
tan tetha = sin tetha / (4/3) sin tetha
tan tetha = 3/4
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bisa pake keseimbangan rotasi....
berarti sigma B = 0
t. A x cos tetha x 30 = t. A x sin tetha x 20 + t .A x cos tetha x 1/2 x 30
t. A x cos tetha x 30 = t A x sin tetha x 20 + t.A x cos tetha x 15
(t. A x cos tetha x 30 - t. A x cos tetha x 15) = t. A x sin tetha x 20
t. A x cos tetha x 15 = t. A x sin tetha x 20
15 cos tetha = 20 sin tetha
3 cos tetha = 4 sin tetha
cos tetha = 4/3 sin tetha
tan tetha = sin tetha / cos tetha
tan tetha = sin tetha / (4/3) sin tetha
tan tetha = 3/4
Jawaban:
Penjelasan:
Dilampirkan pada gambar