Bài tập Xác định các đại lượng dựa vào đồ thị x – v – a lớp 11 (có lời giải)

1,0 Hz.

2,0 Hz.

1,5 Hz.

0,5 Hz

10 rad/s.

10π rad/s.

5π rad/s.

5 rad/s.

v = 4πcos(πt) cm/s.

v = 2πcos(πt) cm/s.

v = 4πcos(πt + π/2) cm/s.

v = 8πcos(πt + π/2) cm/s.

\({\rm{a = }}{{\rm{\pi }}^{\rm{2}}}{\rm{cos}}\left( {\frac{{\rm{\pi }}}{{\rm{2}}}{\rm{t}}} \right)\,\,\left( {{\rm{cm/}}{{\rm{s}}^{\rm{2}}}} \right){\rm{.}}\)

\({\rm{a = 2}}{{\rm{\pi }}^{\rm{2}}}{\rm{cos}}\left( {\frac{{\rm{\pi }}}{{\rm{2}}}{\rm{t}}} \right)\,\,\left( {{\rm{cm/}}{{\rm{s}}^{\rm{2}}}} \right){\rm{.}}\)

\({\rm{a = 2}}{{\rm{\pi }}^{\rm{2}}}{\rm{cos}}\left( {{\rm{\pi t + }}\frac{{\rm{\pi }}}{{\rm{2}}}} \right)\,\,\left( {{\rm{cm/}}{{\rm{s}}^{\rm{2}}}} \right){\rm{.}}\)

\({\rm{a = }}{{\rm{\pi }}^{\rm{2}}}{\rm{cos}}\left( {{\rm{\pi t + }}\frac{{\rm{\pi }}}{{\rm{2}}}} \right)\,\,\left( {{\rm{cm/}}{{\rm{s}}^{\rm{2}}}} \right){\rm{.}}\)

\[{\rm{12\pi cm/}}{{\rm{s}}^{\rm{2}}}{\rm{.}}\]

\[{\rm{8\pi cm/}}{{\rm{s}}^{\rm{2}}}{\rm{.}}\]

\[{\rm{ - 12}}{{\rm{\pi }}^2}{\rm{ cm/}}{{\rm{s}}^{\rm{2}}}{\rm{.}}\]

\[{\rm{ - 8\pi cm/}}{{\rm{s}}^{\rm{2}}}{\rm{.}}\]

\[10{\rm{ rad/s}}{\rm{.}}\]

\[10\pi {\rm{ rad/s}}{\rm{.}}\]

\[5\pi {\rm{ rad/s}}{\rm{.}}\]

\[{\rm{5 rad/s}}{\rm{.}}\]

\[v = 60\pi \cos \left( {10\pi t - \frac{\pi }{3}} \right)\left( {{\rm{cm/s}}} \right).\]

\[v = 60\pi \cos \left( {10\pi t - \frac{\pi }{6}} \right)\left( {{\rm{cm/s}}} \right).\]

\[v = 60\cos \left( {10\pi t - \frac{\pi }{3}} \right)\left( {{\rm{cm/s}}} \right).\]

\[v = 60\cos \left( {10\pi t - \frac{\pi }{6}} \right)\left( {{\rm{cm/s}}} \right).\]

\[x = 4\cos \left( {2\pi t - \frac{\pi }{4}} \right)\left( {cm} \right).\]

\[x = 4\cos \left( {2\pi t + \frac{\pi }{4}} \right)\left( {cm} \right).\]

\[x = 8\cos \left( {\pi t - \frac{\pi }{4}} \right)\left( {cm} \right).\]

\[x = 4\cos \left( {2\pi t - \frac{{3\pi }}{4}} \right)\left( {cm} \right).\]

4,0 s.

3,25 s.

3,75 s.

3,5 s.

\[x = 5\cos \frac{\pi }{2}t\left( {cm} \right)\].

\[x = \cos \left( {\frac{\pi }{2}t - \frac{\pi }{2}} \right)\left( {cm} \right).\]

\[x = 5\cos \left( {\frac{\pi }{2}t + \pi } \right)\left( {cm} \right).\]

\[x = \cos \left( {\frac{\pi }{2}t - \pi } \right)\left( {cm} \right).\]