If the atomic number of an element is 8 and its mass number is 20, how many neutrons are in the atom's nucleus?

What is the philosopher's stone

A lightbulb has a resistance of 240 Ω when operating at a voltage of 120 V. What is the current through the lightbulb?

If you exert a force of 51 n to walk 6 m up a flight of stairs in 9 seconds, how much power do you use? answer in units of w.

Consider the chemical reaction involving graphite as the reactant: 2C (s) + O2 (g) → 2CO (g) ΔH = - 110.5kJ According to the Law of Conservation of Energy, what would be the ΔH if the reaction were reversed? A) - 221.0 kJ B) - 55.

if a runner's is 400 w as she runs, how much chemical energy does she convert into other forms in 10.0 minutes?

Scientific theories have strod the test of time and will not change

An 8 kilogram bowling ball is rolling in a straight line toward you. if its momentum is 16 kg * m/s, how fast is it traveling?

Explain why a moving object can be in equilibrium

Design an investigation to compare the durability of the three different brands

The surface area of the skin of a person who is 70 inches tall and weighs w pounds can be estimated by s (w) equals=342 w superscript 0.425342w0.425 , where s is in square inches.