How does the presence of a catalyst affect the activation energy of a reaction?

A toaster is plugged into an 120-volt outlet. If it has a resistance of 460 ohms, how much power does it use? A. 1,800 watts B. 3.8 watts C. 31 watts D. 55,000 watts E. 340 watts

An air compressor takes normal air and pushes more and more of it in a rigid steel tank. The number of gas particles in the tank is increased. What happens to the temperature as more and more air is pushed into a tank which does not change size? A.

The force pressing two stacked objects together is equal to the weight of the object on top. The friction between a piece of wood on a stone surface is 22.5 newtons.

In what part of the earth does convection occur?

What is power? give the formula

Forensic Odontologists look at number of teeth, tooth development and tooth degeneration to determine A) age B) ancestry C) weight D) height

How is kinetic energy related to the distance

If gravity is not a force how does it accelerate objects?

How many DNA strands could you fit into a milimeter

A circuit contains two 1.5 volt batteries and a bulb with a resistance of 3 ohms. Calculate the current.