3-31 할리데이 10판 솔루션 일반물리학

$$\vec a = (15\cos56.0^\circ)\hat i + (15\sin56.0^\circ)\hat j$$
(a)$a_x=?$ $$15\cos56.0^\circ\approx8.39\ut{m}$$
(b)$a_y=?$ $$15\sin56.0^\circ\approx12.4\ut{m}$$
(c),(d)$\vec a'=?$ $$ \vec a':(15.0,56^\circ-18^\circ)=(15.0,38^\circ)$$ $$ \vec a'=\(15\cos38^\circ\)\hat i + \(15\sin38^\circ\)\hat j$$
(c)$a_x'=?$ $$15\cos38^\circ\approx11.8\ut{m}$$
(d)$a_y'=?$ $$15\sin38^\circ\approx9.24\ut{m}$$