Why does a catalyst cause a reaction to proceed faster?

The downward acceleration of a falling body on Earth is 9.81m/s2. On the moon the same quantity is 1.62m/s2. An astronaut in a space suit has a mass of 145kg.

A bicycle wheel with radius 26" rotates through an arc that measures 80°. What is the length of the arc of the tire that touched the ground? 2.88 inches 5.78 inches 11.56 inches

A person of mass m stands on roller skates facing a wall. After pushing against the wall with a constant force F he moves away, reaching speed v after a distance d. What is the work done by F?

You have been mining for gold and you have found a nugget and are about to be rich. The density of gold is 19.3 grams/cubic centimeter or g/cc. Your sample has a mass of 972 grams and is nearly a perfect cube, each side measuring 3 cm.

If the electric field has a magnitude of 440 N/C and the magnetic field has a magnitude of 0.19 T, what speed must the particles have to pass through the selector undeflected?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons