A.\(40\)
B.\(50\)
C.\(30\)
D.\(60\)

A.24 cm.
B.24,66cm.
C.28,56cm.
D.28cm.

A.\({f_2} = \sqrt 2 {f_1}\)
B.\({f_2} = \dfrac{4}{3}{f_1}\)
C.\({f_2} = \dfrac{{\sqrt 3 }}{{2\sqrt 2 }}{f_1}\)
D.\({f_2} = \sqrt {\dfrac{2}{3}} {f_1}\)

A.14,9cm.
B.4,0cm.
C.\(4\sqrt {13} cm\)
D.8,0cm

A.\(9,7 \pm 0,3\left( {m/{s^2}} \right)\)
B.\(9,7 \pm 0,2\left( {m/{s^2}} \right)\)
C.\(9,8 \pm 0,2\left( {m/{s^2}} \right)\)
D.\(9,8 \pm 0,3\left( {m/{s^2}} \right)\)

A.\(0,4{\rm{s}}\)
B.\(1,2{\rm{s}}\)
C.\(0,25{\rm{s}}\)
D.\(0,6{\rm{s}}\)

A.\(\dfrac{a}{b}\)
B.\(1\)
C.\(\dfrac{b}{a}\)
D.\( - \dfrac{a}{b}\)

A.\(\dfrac{a}{b}\)
B.\(1\)
C.\(\dfrac{b}{a}\)
D.\( - \dfrac{a}{b}\)

A.\(1\)
B.\( - 1\)
C.\(\dfrac{1}{2}\)
D.\( - \dfrac{1}{2}\)

A.\(1\)
B.\(\dfrac{1}{2}\)
C.\(2\)
D.\(0\)