If the resistance force is 40 Newtons and the effort force is 20 Newtons, what is the mechanical advantage?

A 30-kg aluminum block initially at 1408c is brought into contact with a 40-kg block of iron at 608c in an insulated enclosure. determine the final equilibrium temperature and the total entropy change for this process.

Convergent faults ___. can form mountains and volcanoes. happen when tectonic plates move away from one another. create new oceanic crust through sea-floor spreading. happen when tectonic plates stop moving.

What do scientists use observations for?

A big league hitter attacks a fastball! The ball has a mass of 0.16 kg. It is pitched at 38 m/s. After the player hits the ball, it is now traveling 44 m/s in the opposite direction. The impact lasted 0.002 seconds.

When two identical objects traveling at the same speed collide head-on, an observer standing in the earth reference frame sees both objects changing direction?

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

Describe how electricity flows through a simple closed circuit.

Solar energy is produced by A. fusion of light nuclei to make heavier ones B. the slow release of heat left over from the Sun's formation C. fission of heavy nuclei into lighter ones D. solar magnetism

A 72-kg fisherman in a 114-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 5.0 m/s.

Roberto creates an animation titled "Flying through an Atom." The animation makes it seem as if the viewer passes all the way through an atom, starting from one side, then through the atom's center, and then leaving through the other side.