Trắc nghiệm Vật lý 12 Bài 5 Tổng hợp hai dao động...

A. \(x = 5\sqrt 2 cos\left( {2\pi t + \frac{\pi }{2}} \right)\,\,cm\)

B. \(x = 5\sqrt 2 cos\left( {2\pi t} \right)\,\,cm\)

C. \(x = 5\sqrt 2 cos\left( {2\pi t - \frac{\pi }{2}} \right)\,\,cm\)

D. \(x = 5\sqrt 2 cos\left( {2\pi t + \frac{\pi }{6}} \right)\,\,cm\)

A. \(x= 7,9 cos(5 \pi t + \frac{41\pi}{180})\)

B. \(x= 7,9 cos( \pi t + \frac{41\pi}{180})\)

C. \(x= 7,9 cos(5 \pi t - \frac{41\pi}{180})\)

D. \(x= 7,9 cos( \pi t - \frac{41\pi}{180})\)

A. \(x_2= 5 cos (6 \pi t+\frac{2 \pi}{3})\)

B. \(x_2= 5 cos ( \pi t+\frac{2 \pi}{3})\)

C. \(x_2= 5 cos (6 \pi t-\frac{2 \pi}{3})\)

D. \(x_2= 5 cos (\pi t-\frac{2 \pi}{3})\)

A. 81 cm/s

B. 81,7 cm/s

C. 81,7 m/s

D. 81 m/s

A. \(x= 200cos (20 \pi t+\frac{\pi}{12})\)mm

B. \(x= 200cos (20 \pi t-\frac{\pi}{12})\)mm

C. \(x= 20cos (20 \pi t-\frac{\pi}{12})\)mm

D. \(x= 200cos (200 \pi t-\frac{\pi}{12})\)mm

A. 100 cm/s.             

B. 50 cm/s.       

C. 80 cm/s.    

D. 10 cm/s.

A. \({x_2} = 8\cos \left( {\pi t + \frac{\pi }{6}} \right)\)

B. \({x_2} = 2\cos \left( {\pi t + \frac{\pi }{6}} \right)\)

C. \({x_2} = 2\cos \left( {\pi t - \frac{{5\pi }}{6}} \right)\)

D. \({x_2} = 8\cos \left( {\pi t - \frac{{5\pi }}{6}} \right)\)

A. \(24\sqrt 3 \) cm/s.

B. 24 cm/s.       

C. 8 cm/s.            

D. \(8\sqrt 3 \) cm/s.

A. 23 cm. 

B. 7 cm.         

C. 11 cm.     

D. 17 cm.