Suppose we could somehow extract 1.0% of the Earth's rotational kinetic energy to use for human needs?
916850
the earth rotational energy is calculated to be  2.58×10^29 J , thus 0.01 of this is 2.58*10^27J , and this enough for human needs for about  2580000000 years .\n\nand if we asume that the energy decrease the rotational energy by the same portion (0.01%) then the day length will decrease by 14.4 mins.
460675
We dont even have a machine with efficiency close to 1, you are talking of a machine of efficeincy 2 or more. What of the law of conservation of energy, and mass and momentum?\n\nI don't think it's possible, not in this universe within the limits of the known laws of Physics.
981532
If you assume it is possible and of course it isn't but.... \nIf we also assume that there is no terminal velocity and that our momentum would take us past the centre and carry us to the other side. our velocity would be zero at the start and at the end and would reach maximum at the centre it would be V=(T x G) / D where V is velocity T is time G is acceleration due to Gravity (9.8 metres per second per second) and D is distance (12,756.32 kilometres). By moving the various components in this equation you should be able to find all the needed figures. The total time would be determined by found by finding the time needed to reach the centre of the Earth and then doubling it as the time needed to decelerate is the same as acceleration
996396
Yes, but it would be expensive to build the equipment and incredibly dangerous - imagine if the laser was hit by a small bit of space debris and the laser light moved - it would be like dropping a fire-bomb.  \n\nFar better to harvest the natural sunlight when it reaches the earth!
567556
Well, 1st thing, how much energy you want to put into it?
102002
Sure, but as you can tell, it would take a whole lot of energy to make a little mass.  Just think atom bomb.
509966
Ummm that's not a real question.\n\nBut, if that happened, you'd end up with someone standing on the earth who observed that small particle moving in a direction opposite the earth's rotation at a speed that could be calculated by:\n\n(radius of the earth)*6.28*(1/30-1/24)
722751
That's not renewable. You just demonstrated that perpetual motion is feasible! Hello Nobel! Can I get in on this?
320753
Anything the energy can be converted to use for.\n\nUsually it is light and heat though.
334966
Yes, and I wish I could find that link I read years ago.  The above methods are acceptable, but this method used up “A LOT” of energy, and was not perfected.  When I worked at NASA years ago there was a joke about it. Now there is something to it they have found.  Like anything else you through enough money at it you will get something out of it.  So for your government money watchers I recall something like only 5 to 8 % of this research budget comes from government grants. It really does not have any military value as of yet.
411815
No.If there was we would use nuclear energy.It is not and never was a workable energy source because of the hazards and waste.
633311
Yes, every problem could be solved through hard work and/or blunt honesty.  Unfortunately, too few people are willing to work at it.  It is a shame--"we've borrowed this earth from our grandchildren"
616877
All engines have a cost.  I suggest that the cost of this form of energy may be the slowing of the rotational period of the Earth.  What would we pay in time
664993
75% of the earth...u do the rest of the calculation.
1076095
Yes but it would take a some time and a lot of effort and money invested into alternative sources in energy . We know that we have the capabilities with hydro electric wind solar and nuclear energies but they need more time and effort the only problem is with global warming Do we have the time?
882232
Know what? The answer is "yes", we could and would change the rotation of Earth. If every wheeled vehicle simultaneously accelerated eastward, Earth's rotation would slow a bit, and if they accelerated westward, it would speed up.  You can calculate the amount, it's actually a pretty simple physics application, starting with say 1 billion 3000-pound vehicles, say all of them spread out along the equator, all accelerate at 1 G, and given the mass of Earth, which is easily look-up-able.  Of course, we're probably talking a change of only picoseconds or maybe only femtoseconds per day, but it is a true and calculatable, even theoretically testable change.  Also note that friction, both during the mass-acceleration and especially once everybody hits the brakes, will impart the opposite force, resulting in a zero net gain.  In other words, a temporary, but no permanent change in rotational speed is possible under this scheme, unless somehow the vehicles, while accelerating, attain a speed sufficient to launch them into space at escape velocity.  Then their effect on Earth's rotation can remain behind as permanent.\n\nInteresting thought, huh?\n\n[Below added after reading the 2 posts below]\n\nOkay, I took a crack at the math, thank you wikipedia for the definitions and equations:\n\n1 billion cars of average of 1000 kilograms each, lined up along the equator accelerate simultaneously from a dead stop at a rate of 1G (32ft/sec^2).  Their combined net torque looks to be a force of 10^12 kg, approximately equal to 10^13 Newtons. If I understand wiki correctly, the change in the speed of the rotation of Earth (in radians per second) will be the previously-calculated torque divided by the moment of inertia of Earth, which should be:\n\n(2/5)(6*10^24)(13*10^6)\n\n so the change in speed will be:\n\n10^13/[(2/5)(6*10^24)(13*10^6)] radians per second =\n0.3*10^ -18 radians per second that the cars accelerate at 1G.  If they can do that for just 10 seconds, the change in Earth's rotation would total  3*10^ -18 radians per second, or .26*10^ -12 radians per day.  Earth's rotation is about 24*10^12 times faster, so I think altogether that works out to a net change of 3.6*10^ -9, or 3.6 picoseconds change per day in Earth's rotation?  Tho I pretty sure I've made at least a couple of mistakes along the way, I gotta love how that agrees with my original guesstimate above.\n\nJeeez, it's 2 in the morn - I really DO need to get a life...
944480
yes i would, i think our planets resources are runnig out fast so i'd wellcome anything that slows this down but that all we can do .