A red toy car moving east at a velocity of \( \mathbf{3 . 2} \mathbf{m s}^{\mathbf{- 1}} \) collides with a blue toy car of the same mass moving in the opposite direction. After the collision, the red toy car has a new velocity of \( \mathbf{1 . 1 3} \mathbf{m s}^{-\mathbf{1}} \) east. Calculate the velocities of the blue toy car before and after the collision. ASSUME that the collision was perfectly elastic and there are no external forces

\( \left.\qquad R .3,6 \mathrm{~m} / \mathrm{s}^{2} ; 270 \mathrm{~m} / \mathrm{s}^{2} ; 1,6 \mathrm{~m} / \mathrm{s}^{2}\right] \) Determina l'accelerazione di gravita g' esercitata dalla Terra sulla Luna, sapendo che la distanza della Luna dalla Terra è 60,25 raggi terrestri e che l'accelerazione di gravità g è \( 9,8 \mathrm{~m} / \mathrm{s}^{2} \). [R. \( \left.0,27 \mathrm{~cm} / \mathrm{s}^{2}\right] \)

(a) (i) State the principle of superposition of waves. (ii) Distinguish between standing and stationary waves. (b) Define the following terms as applied to sound waves (i) Interference and beating. (ii) resonance and fundamental frequence.

14. Di qué tipo de movimiento tendrá un cuerpo sometido a una fuerza resultante nula y a un momento de las fuerzas no nulo. ¿Y un cuerpo sometido a una fuerza resultante no nula?

4. Conjecture: Does thiction cause more energy to be wasted if the object is heavier? Why? Use the Gizmo to test this. Describe your results in your notebook or on a separate sheet.

14. Di qué tipo de movimiento tendrá un cuerpo sometido a una fuerza resultante nula y a un momento de las fuerzas no nulo. ¿Y un cuerpo sometido a una fuerza resultante no nula?