The pencil has a shadow. is the pencil opaque or transparent?​

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

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.