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Escape from Earth's (or any other planet's) gravity is dependent on reaching the escape speed for that gravity field. In the case of Earth, that requires a speed of nominally 11.2 kilometers per second. In practice, however, it is never necessary to actually reach that speed, because the effect of gravity lessens as distance from the center of the Earth increases. To answer your question, the amount of thrust (which is normally measured in pounds of thrust, but can be measured in horsepower) is dependent on the weight of the vehicle, its payload and fuel, and on the optimum rate at which it needs to burn its fuel to achieve altitude with the least consumption. On the space shuttles, the three main engines generate a maximum equivalent of about 37 million horsepower. The fuel pump alone delivers as much as 71,000 horsepower, the oxygen pump delivers about 23,000. Space shuttles don't escape Earth's gravity though; they just orbit the Earth. Mathematically, there is no requirement for power but rather for energy. There is no speed requirement for propelled vehicle either. The escape velocity refers to speed that an object needs to achieve leaving the gravitational well altogether without further acceleration. Provided there were efficient technical means(like in case of space elevator) vehicle could climb slowly into space with power going only for overcoming friction and it would be negligible. More power would only make a difference in time it would take to reach the top. Today however it's just technically convenient to boost the payload to orbital speed using enormous rockets and then leave it in free fall.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agodepends on its mass, say it's 1 kg, then any force greater than 1kg will produce an acceleration, and since gravity diminishes as you move up then the acceleration will increase.
example: (assume acceleration due to to gravity = 10 (m/s)/s )
a 1 kg mass sits on the ground , the earth exerts a force of 10 newtons (f = m*a) say you apply a force under it of 20 newtons, the resultant is +10 newtons for acceleration , which would give it an acceleration of 10 (m/s)/s , however , when you get to say 2 earth radius away , the gravitational effect is reduced to 2.5(m/s)/s (2.5 newtons) and with the same applied force (20 newtons) the resultant is +17.5 newtons, giving an acceleration at that point of 17.5(m/s)/s
Excellent, both of you! There's just one more thing though ... If you could,
you might clean it up just a bit to remove the messy reference to "1 kg" as
a "force".
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How much gravity does planet venus have?
It has about 9/10 of earths gravity.
How much stronger is the earths gravity than the moons gravity?
The moon's gravity is about 1/6th of Earth's.
What is an object so massive that light cannot escape its gravity is a?
A black hole has so much mass that light can't escape from it once it passes the event horizon. It can still escape if it hasn't passed the evnt horizon.
How much gravity does the earth have please can you write it in terms a child can understand?
Its hard to explain it, but the equatorial surface gravity is 9.780327 m/s2 or 0.99732 gThe Earths gravity is around 380 ppm (pounds per mile).Sorry if this is too confusing!
If gravity waves travel at the speed of light and black holes' escape velocity is much greater than the speed of light then how can gravity waves escape a black hole?
Gravity is not a 'wave', it is a field of curvature of space-time caused by objects with mass. A black hole contains the mass of a star, compressed to the space of a single atom (a singularity), the compression of so much mass into such a small space, is why the black hole has such a powerful gravitational pull.
How much gravity does planet venus have?
It has about 9/10 of earths gravity.
How much thrust is needed to escape earths gravity if something weighs 1520?
Any force larger than the weight is sufficient, if it is applied long enough.
How much more is Earths surface of gravity than the Moon's?
Earths surface of gravity is 4.6m/s2 more than moons.
How much stronger is the earths gravity than the moons gravity?
The moon's gravity is about 1/6th of Earth's.
What is mars gravity force earths gravity equals 1?
No, Its gravity is much lower due to a lower overall mass of the planet. Mars' gravity is about 37.6% of the Earths.
How much smaller is the Moon's gravity to the earths?
The moon's gravity is one-sixth that of the Earth's;
Is mercurys gravity stronger or weaker th an earths gravity?
Weaker, much weaker.
How much is gravity on Earth compared to the moon?
The moon has one-sixth of the Earths gravity.
Would a spacecraft need as much fuel to escape from the moons gravity as it would to escape from the earths?
Escape velocity for the moon is a little over 5000 miles per hour. For the earth it is about 25,000 miles per hour. So the moon requires a fifth of the energy required to escape the earth.
Does the earths moon have gravity?
Yes, the moon has gravity. In fact, all matter has gravity, that is a basic property of matter. Your fingernail has gravity. Not very much, of course, but it does have some.
How would your weight change if you went from the Earth to the moon?
Your would weigh 1/6th as much as you do here on mother Earth. The how is our moons' mass, and therefore its' gravity, is about 1/6 as much as the Earths'. Its' gravity well is not as deep as the Earths.
Why does not the moon have gravity?
The moon does have gravity but it is much weaker it hase 1/6 of the earths gravity. wihout it how do you expect the men on the moon to stay on the moon?
