If the fan blades rattle while the fan is turning, you can stop the noise by
a. oiling the blades.
b. adjusting the blade angles and the blade tip position.
c. cleaning the blade surfaces.
d. tightening the motor end bells and motor mounts.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

pecialized keyboards

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach