How much energy does it take to escape Earth?
the energy required to escape the Earth's gravitational field is GMm / r, a function of the object's mass (where r is radius of the Earth, nominally 6,371 kilometres (3,959 mi), G is the gravitational constant, and M is the mass of the Earth, M = 5.9736 × 1024 kg).
A spacecraft leaving the surface of Earth, for example, needs to be going about 11 kilometers (7 miles) per second, or over 40,000 kilometers per hour (25,000 miles per hour), to enter orbit.
We can assume the acceleration is constant in that fairly short period of time so that's about 100 000 m/s^2. Which is about 10 million Newtons for a 100 kg human. Each engine of the Concorde had 170 thousand Newtons, with afterburner.
It is predicted that we will run out of fossil fuels in this century. Oil can last up to 50 years, natural gas up to 53 years, and coal up to 114 years. Yet, renewable energy is not popular enough, so emptying our reserves can speed up.
The Earth's gravitational field extends well into space it does not stop. However, it does weaken as one gets further from the center of the Earth. The Shuttle orbits about 125 mi above the surface, roughly the distance between Jackson and Nashville!
Normally, humans aren't thrown off the moving Earth because gravity is holding us down. However, because we are rotating with the Earth, a 'centrifugal force' pushes us outwards from the centre of the planet. If this centrifugal force were bigger than the force of gravity, then we would be thrown into space.
A force called gravity is pulling you down towards the centre of the Earth. Anything with mass also has gravity, the more mass something has, the stronger the pull of gravity.
But, for the most part, we don't feel the Earth itself spinning because we are held close to the Earth's surface by gravity and the constant speed of rotation. Our planet has been spinning for billions of years and will continue to spin for billions more. This is because nothing in space is stopping us.
This value comes from military studies on paratroopers: the human body can withstand a maximum deceleration of about 15 G, or 12 kN for an 80 kg mass.
Unfortunately getting anything to break free from the inexorable pull of Earth's gravity requires a startling amount of power and fuel, as objects must reach escape velocity around (25,000 miles an hour) to break orbit.
How hard can a human pull in newtons?
The greatest pull strength of 400 Newtons (N) for males was recorded in the seated and standing positions. Females' pull strengths in the seated and standing positions were 222 and 244 N, respectively. The strongest push strength was always at the maximum reach at the overhead location.
All plant and animal life on Earth need oxygen to survive.
Oxygen makes up one-fifth of the air we breathe, but it's the most vital component – and it does seem to be declining. The main cause is the burning of fossil fuels, which consumes free oxygen. Fortunately, the atmosphere contains so much oxygen that we're in no danger of running out soon.
Atmospheric oxygen levels are very slowly decreasing today due to the burning of fossil fuels, which consumes oxygen, and deforestation which reduces oxygen production, but not enough to alter biological processes.
Scientists have recently observed for the first time that, on an epigenetic level, astronauts age more slowly during long-term simulated space travel than they would have if their feet had been planted on Planet Earth.
Can you Age less if you live in an environment with more Gravity? No, definitely not. Clocks tick slower in more gravity, but the time on clocks has nothing to do with aging. The force of gravity is the cause of motion and stress that causes physical age.
If our planet were to lose gravity for even five seconds, it would spell the end of life on Earth as we know it. Gravity pulls objects toward one another. The more massive an object is, the stronger its gravitational pull.
If Earth stopped rotating and fell to a standstill, humanity would be in trouble. If the planet stopped suddenly, everything on the surface would be destroyed, as the atmosphere, oceans and anything not nailed down kept spinning.
However, it will take billions of years before the earth stops spinning, and the gravitational equipotential creates a mean sea level that is a perfect sphere.
If the Earth didn't spin, the night sky would always show the same constellations of stars, because you would always be looking out into space in the same direction. This is very different from seeing the stars rise and set during the night, and seeing different constellations at different times of the year.
How fast would Earth have to spin to throw us off?
Gravity and the centrifugal force of Earth's spin keep us grounded. In order for us to feel weightless, the centrifugal force would need to be ramped up. At the equator, Earth would need to spin at 28,437 kilometres per hour for us to be lifted off into space.
So the Earth's core is liquid because it's hot enough to melt iron, but only in places where the pressure is low enough. As the Earth continues to age and cool, more and more of the core becomes solid, and when it does, the Earth shrinks a little bit!
Gravity always pulls you towards the middle of the object. So for the Earth, which is shaped like a ball, the force of gravity pulls you to the centre from every point on the ground. That's why, no matter where you stand on the Earth, you always feel like the ground is at the bottom and the sky is up.
The reason is something called 'inertia. ' The Earth is rotating and always spins toward the east. Suppose you're about to take off in an airplane, in that same direction. Whether you realize it or not – as you sit on the runway – your plane is already moving at the same speed Earth spins.
When the satellite escapes into the outer space its minimum total energy is zero. Hence the minimum energy to be supplied for the satellite to escape into the space is+GMm/2r=E,the K.E of the satellite.
Zero-point energy (ZPE) is the lowest possible energy that a quantum mechanical system may have. Unlike in classical mechanics, quantum systems constantly fluctuate in their lowest energy state as described by the Heisenberg uncertainty principle.
For example, a spacecraft leaving the surface of Earth needs to be going 7 miles per second, or nearly 25,000 miles per hour to leave without falling back to the surface or falling into orbit.
Hence, the minimum required energy is 6R5GmM.
The average human, at rest, produces around 100 watts of power.  Over periods of a few minutes, humans can comfortably sustain 300-400 watts; and in the case of very short bursts of energy, such as sprinting, some humans can output over 2,000 watts.
How much energy hits the Earth per second?
Globally, over the course of the year, the Earth system—land surfaces, oceans, and atmosphere—absorbs an average of about 240 watts of solar power per square meter (one watt is one joule of energy every second).
The average adult needs about 8700 kilojoules (kJ) a day to maintain a healthy weight. But it varies quite a bit - some people need more and others less. Many factors influence how much energy you need, such as: how active you are.