Quesito 2A In un test d'urto, un'auto di massa \( \mathrm{m}=1500 \mathrm{~kg} \) urta contro un muro. La velocitá iniziale è \( \mathrm{v}_{\mathrm{i}}=15,0 \mathrm{~m} / \mathrm{s} \) e quella finale è \( \mathrm{v}_{\mathrm{r}}=2.60 \mathrm{~m} / \mathrm{s} \) con verso opposto. Se la durata dell'urto è \( 0,150 \mathrm{~s} \), determinare l'impulso dovuto all'urto e la forza esercitata sull'auto supposta costante.

9. A 0.13 kg puck is moving in a circular path on a horizontal air table where friction is negligible. The centripetal force is provided by a cord 0.68 m long attached in the centre of the air table. If the tension in the cord is 2.5 N , what is the speed of the puck?

4) Dos puntos, A y B, están en la misma horizontal separados por una distancia de 400 m . Desde A parte del reposo y hacia B un movil con una aceleración de \( 1,8 \mathrm{~m} / \mathrm{seg} \). S.multaneamente y desde B, parte hacia A otro movil con una rapidez inicial de \( 4 \mathrm{~m} / \mathrm{seg} \) y una aceleración de \( 2,8 \mathrm{~m} / \mathrm{seg}{ }^{2} \). Calcular donde y cuando se encuentran.

A car with a mass of 800 kg accelerates uniformly from rest to \( 100 \mathrm{~km} / \mathrm{h} \) for 8 seconds up an incline that makes an angle of \( 30^{\circ} \) with the horizontal. The frictional resistance is 280 N . Calculate: 3.2.1 The work done against the frictional force when the velocity reaches \( 100 \mathrm{~km} / \mathrm{h} \) \( \begin{array}{l}\text { The work done against the gravitational component parallel to } \\ \text { 3.2.2 the plane }\end{array} \)

QUESTION 5: HYDRAULICS 5.1 The data below refer to a single-acting hydraulic press. Diameter of the ram piston \( \quad=450 \mathrm{~mm} \) Diameter of the plunger piston \( \quad=100 \mathrm{~mm} \) Stroke length of the plunger \( =120 \mathrm{~mm} \) Mechanical advantage of the plunger \( =20 \)

Find the dimension of gravitational cons tant and pressure