The cross section area of a hole is 725cm^2. Given that the area of a circle is A=3.14r^2, find the radius of the hole.

Based on the location of nitrogen (N) on the periodic table, how many additional electrons does a nitrogen atom need in its valence shell to satisfy the octet rule when it forms bonds?

What is most likely to happen to light that hits an opaque object? A. All of the light passes through the object. B. None of the light passes through the object. C. Most of the light disappears. D. Some of the light passes through the object.

Nicholas sends 20.0 minutes ironing shirts with his 1800-watt irn. How many joules of energy were usedby the iron

A tennis player hits a ball at an angle of 50 degrees above horizontal so that it has an acceleration of 12 m/s2. What is the horizontal component of the acceleration?

What is the tube that carries air inside a lung?

At what temperature does gasoline freeze

A closed, rigid tank contains Refrigerant 134a initially at 100°C. The refrigerant is cooled until it becomes saturated vapor at 20°C. Kinetic and potential energy effects can be ignored.

What does the Law of the Conservation of Mass state

D. protons and neutrons have charges of the same magnitude but opposite sign. true or false

Explain the roles of products, reactants, and limiting reactant in chemical reaction.