When a person pushes off a wall with 15N of force, how much force does the wall push back

1. Air contains mostly nitrogen (78%) and oxygen (21%). It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids).

If the moon disappeared, what effect would this have on the Earth's tides? A) There would no longer be any tides. B) The tides would be much more dramatic. C) Tides would not be as noticeable as they are now.

Science fair projects for 7th grade ideas?

What substance reacts with acid to form hydrogen gas is it one of the below Carbonate, oxygen, carbon dioxide, magnesium ribbon, gold which one?

What is the density of hydrogen sulfide (h2s) ?

If the mass of a material is 76 grams and the volume of the material is 16 cm3, what would the density of the material be? g/cm3

Calculate the specific heat of a metallic element if 50.0 g of the metal need 314 joules of heat energy to raise the temperature from 25°C to 50°C.

State the relationship between the number of electrons in a carbon-nitrogen bond and carbon-nitrogen bond energy

What are the characteristics of bones?

If 294 grams of FeS2 is allowed ti react with 176 grams of O2 according to the following equation how many grams of Fe2O3 are produced? FeS2 + O2 = Fe2O3 + SO2