the speed of earth is 1690 km/hr which is approx. 469 m/s which is more than the speed of sound (330 m/s) so why is there no sonic boom ??
2007-02-20 23:46:32 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
that is the speed rotation velocity on its axis at the equator: all the earth and atmosphere is rotating at that speed so the relative speed is 0.
As an object moves through the air, it creates a series of pressure waves in front of it and behind it, similar to the bow and stern waves created by a boat. These waves travel at the speed of sound, and as the speed of the aircraft increases the waves are forced together or 'compressed' because they cannot "get out of the way" of each other, eventually merging into a single shock wave at the speed of sound. This critical speed is known as Mach 1 and is approximately 1,225 kilometers per hour (761 mph) at sea level.
The space is nearly empty around the planet and sound waves cannot travel in the void, so no shock wave.
BTW the earth has an average orbital speed around the sun of 29.783 km/s (107,218 km/h)
also the Sun (and the earth too) is orbiting around the center of the galaxy at the speed of 217 km/s (781,200 km/h), and 20 km/s relative to average velocity of other stars in stellar neighbourhood.
2007-02-21 00:10:39 · answer #1 · answered by scientific_boy3434 5 · 1⤊ 1⤋
>yet what i replaced into questioning is there a formulation i will use to be sure how briskly an merchandise ( say a motor vehicle going 50 MPH ) on earth could be going after a collection volume of time in area. i'm not sure what you advise. A momentum conversion supply you with the comparable result, so perhaps you're speaking approximately changing the spent potential? Even then, the reality that a motor vehicle engine is a few distance from being completely effective makes the calculation overly complicated. >however the undertaking that i'm having hardship know-how is speed could this grow to be if that comparable acceleration replaced into preformed in the earths ecosystem. The air resistance does not cut back the fee to a pair fastened fee based on the fee in area. particularly, without persisted thrust, air resistance maintains slowing the object till at last its speed methods 0 (and, by using random historic past consequences, will become efficiently 0 particularly immediately). a persevering with thrust against air resistance will produce an ever-slowing acceleration drawing near some consistent, finite speed, reckoning on the mass and air resistance of the object being speeded up. dawn, case in point, makes use of an ion force which delivers very low thrust, so in the Earth's ecosystem it could concepts-set an fairly low speed, lots slower than a common motor vehicle.
2016-12-17 15:16:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Becasue there is no air in space and the air moves along with the Earth as it turns.
It's part of Einsteins relativity theory that you acclimated at some point in time. Riding in a car or elevator exemplifies this. When the elevator starts you feel the tug of gravity and inertia, but after a few seconds you stablize and are no longer aware of the motion until the car stops moving. You'll notice the air doesn't move it stays right there with you. There is no breeze falling down as the car starts upwards.
So, as it is when you get into a car and drive 65 on the highway for hours never noticing the speed, we have aclimated to traveling some 500 to possibly more miles per second in space.
2007-02-21 00:11:20 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Firstly, speed is always relative to something... The earth is moving through space. There is no atmosphere in space. Since you need an atmosphere for a sonic boom, there is no sonic boom.
Also since our atmosphere is moving at the same speed as the earth we are standing still relative to the atmosphere and that is why there is no sonic boom in our atmosphere either.
2007-02-20 23:56:04 · answer #4 · answered by xcaluber 1 · 2⤊ 1⤋
Sound needs to travel through a medium. On Earth, sound usually travels through air. Since there is nothing for sound to travel through in space, no sonic boom is heard.
2007-02-21 00:17:52 · answer #5 · answered by bldudas 4 · 0⤊ 1⤋
well how do you know there isn`t one?
when a jet breaks the soud wall, the sonic boom is felt outside the cocpit, inside things are normal.
But I think there`s no point in speaking of a sonic wall in space!!!
there`s no air - no medium that transfers sound, right?
2007-02-21 00:00:01 · answer #6 · answered by gordan p 2 · 1⤊ 1⤋