A.\(\dfrac{\pi }{2}\)
B.\(2\pi \)
C.\(\pi \)
D.\(\dfrac{\pi }{4}\)

A.5 hoặc 1.
B.4 hoặc 2.
C.3 hoặc 1.
D.4 hoặc 3.

A.1837
B.1839
C.1840
D.1845

A.1837
B.1839
C.1840
D.1845

A.3
B.2
C.4
D.1

A.44
B.46
C.48
D.50

A.\(9,988 \pm 0,297m/{s^2}\)
B.\(9,899 \pm 0,275m/{s^2}\)
C.\(9,988 \pm 0,144m/{s^2}\)
D.\(9,899\; \pm 0,142m/{s^2}\)

A.60V.
B.180V.
C.240V.
D.120V.

A.\(x = 3\cos \left( {\omega t + \dfrac{\pi }{6}} \right)cm\)
B.\(x = 3\cos \left( {\omega t - \dfrac{\pi }{6}} \right)cm\)
C.\(x = 6\cos \left( {\omega t + \dfrac{\pi }{2}} \right)cm\)
D.\(x = 6\cos \left( {\omega t - \dfrac{\pi }{2}} \right)cm\)

A.\(i = 2\cos \left( {100\pi t - \dfrac{\pi }{4}} \right)A\)
B.\(i = 4\cos \left( {100\pi t + \dfrac{\pi }{4}} \right)A\)
C.\(i = 4\cos \left( {100\pi t - \dfrac{\pi }{4}} \right)A\)
D.\(i = 2\cos \left( {100\pi t + \dfrac{\pi }{4}} \right)A\)