Free Physics Facts and/or Lessons:

The formula for solving a problem related to Kinetic Energy is KE = 0.5 x mv^2 or KE = 1/2 x mv^2. m = mass and v = velocity. With the given mass and velocity of the problem, it can be solved with this equation.

The equation for Gravitational Potential Energy is PE = mgh, m = mass, g = gravity, where the rate of gravitational acceleration is 9.8 meters per second. It'd be best to round up and make it 10 meters per second for a better answer. It's right either way.

The equation for weight is W = mg... mass and gravity. All weight is mass x gravity, again, gravity is 9.8 meters per second through free fall.

The equation for momentum is p = mv... Mass x velocity.

The equation for frequency is f= 1/T. The equation for pressure is P = F/A.

The density of the universe; various quotes.
"The critical density of matter in the universe that separates the two possibilities can be calculated from Einstein's theory. It is now approximately 10−30 grams per cubic centimeter. Small though this value may be, it separates two entirely different futures for the universe."
"The value of the critical mass density is believed to lie between 4.5 × 10−30 and 1.8 × 10−29 grams per cubic centimeter, depending on the value for the expansion rate (i.e. the Hubble constant) that one uses in the calculation. By standards of our everyday experience, this density is astonishingly low. The critical density corresponds to somewhere between 2 and 8 hydrogen atom per cubic yard, a density that is more than ten million times lower than that of the best vacuum that can be achieved in an earthbound laboratory!"

"What is the density of the Universe and the size of the Universe?
Density = 2.11 × 10−29 kg/m3 Radius = 3 × 1026 meters"

Question

Free Physics Facts and/or Lessons:

The formula for solving a problem related to Kinetic Energy is KE = 0.5 x mv^2 or KE = 1/2 x mv^2. m = mass and v = velocity. With the given mass and velocity of the problem, it can be solved with this equation.

The equation for Gravitational Potential Energy is PE = mgh, m = mass, g = gravity, where the rate of gravitational acceleration is 9.8 meters per second. It'd be best to round up and make it 10 meters per second for a better answer. It's right either way.

The equation for weight is W = mg... mass and gravity. All weight is mass x gravity, again, gravity is 9.8 meters per second through free fall.

The equation for momentum is p = mv... Mass x velocity.

The equation for frequency is f= 1/T. The equation for pressure is P = F/A.

The density of the universe; various quotes.
"The critical density of matter in the universe that separates the two possibilities can be calculated from Einstein's theory. It is now approximately 10−30 grams per cubic centimeter. Small though this value may be, it separates two entirely different futures for the universe."
"The value of the critical mass density is believed to lie between 4.5 × 10−30 and 1.8 × 10−29 grams per cubic centimeter, depending on the value for the expansion rate (i.e. the Hubble constant) that one uses in the calculation. By standards of our everyday experience, this density is astonishingly low. The critical density corresponds to somewhere between 2 and 8 hydrogen atom per cubic yard, a density that is more than ten million times lower than that of the best vacuum that can be achieved in an earthbound laboratory!"

"What is the density of the Universe and the size of the Universe?
Density = 2.11 × 10−29 kg/m3 Radius = 3 × 1026 meters"

Razor · Answer

Enjoy this overload of knowledge.

mhchen · Answer

Good to know that the universe has a radius of 3078 meters

justus · Answer

Well, someone seems to be studying 🙂

bananas · Answer

Free physics fact: if you get slapped in the face, you need to clap back or the universe won't be pleased.

Newton's third law.

Shadow · Answer

Great stuff, although I'd note that typically formulas involving gravity utilize 9.8 or more decimal points as the numeric since it's the closer approximation to the actual value.

Teachers sometimes advise 10 when they care more about your thought process of the problem as opposed to your math skills (some people have trouble w/decimals hence the 10, and I guess it's prettier too).

Razor · Answer

Decimals big easy smh

Shadow · Answer

xd