An automobile company displays a die-cast model of its first car, made from 8.70 kg of iron. to celebrate its hundredth year in business, a worker will recast the model in solid gold from the original dies. what mass of gold is needed to make the new model?

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

How to tell if a molecule is polar or nonpolar with electronegativity

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.