Electromagnets can be turned off, this makes it easier to release things from the magnetic field.
Hope this helps :)
Answer:
70.07 Hz
Explanation:
Since the sound is moving away from the observer then
and 
when moving towards observer
With 
of 76 then taking speed in air as 343 m/s we have
Similarly, with of 65 we have
Now
v_s=27.76 m/s
Substituting the above into any of the first two equations then we obtain
Answer:
Just to be clear if you are poor, this is not the place to go. There are several institution that will be willing to help you out. If you can get on Brainly, then you can also do some research that will actually help you
Explanation:
Alban Geissler, who developed the SKYRAY carbon fiber wing with Christoph Aarns, suggested after Baumgartner's jump that the wing he used was a copy of two prototype SKYRAY wings sold to Red Bull (Baumgartner's sponsor) two years earlier. - wiki
