Hola! Este año voy a empezar 4to de la ESO en españa, me acabo de mudar desde latinoamerica y en mi pais no dan fisica hasta el equivalente a 4to de la eso, fisica en 4to de la eso es optativa pero quiero estudiar el bachillerato cientifico por lo que creo que es necesario, que debería repasar/estudiar para que no me vaya tan mal este año?

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.