A 2,511 kg railroad car moving at 4.192 m/s to the east collides with a 8,199 kg railroad car moving at 3.781 m/s to the west. If the cars couple together, what is their velocity after the collision?

A box weighing 4.0 N is lifted 3.0 meters. How much work is done on the box? 0.0 J 1.0 J 7.0 J 12 J

Determine the average acceleration for x (t) = 19t^2+7t^3 for a time interval between 3 and 9 seconds

Without friction, what force is needed to maintain a 1,000 kg car in uniform motion for 30 minutes?

If two materials are made from different kinds of atoms, what else should you expect to be different? a. the kinds of neutrons they have b. the properties they have c. the mass of their electrons d. the charge of their protons

Which example best illustrates that light behaves like particles? Light bends as it strikes a window. Light bounces off a white cement sidewalk. Light travels in space at a speed of about 3.0 x 108 m/s.

Consider two rocks with masses of 1 and ten kilograms. What is the relation between their inertia's? Between their masses? Between their weights on earth?

If a cart of 4 kg mass has a force of 8 newtons exerted on it, what is its acceleration?

Why does the liquid thermometer work?

What energy do electrons have when they are farther away from the nucleus?

200 525000 lololo Boat A is 10 km north of a port. Boat B is 5 km east of the same port. Boat A sails in a straight line towards boat B. Work out the bearing on which boat A sails.