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3 years ago

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Physics

2 answers:

Alexandra [31]3 years ago

7 0

Mechanical waves need material stuff to travel through.

They cannot travel through vacuum.

That's why we can't hear the explosions on the sun.

That's also why astronauts standing on the moon or working outside the Space Station have to use radio to talk to each other, even if they're only a few inches apart. There's no air between them, or any other material stuff. So sound can't travel between them.

Fiesta28 [93]3 years ago

4 0

They can travel through a medium

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Two charged spheres are 8.45 cm apart. They are moved, and the force on each of them is found to have been tripled. How far apar

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Force between two charges is given by

$F = \frac{kq_1q_2}{r^2}$

here force is inversely depends on the square of the distance

so here if distance is decreased the force will increase'

now if force is tripled

$\frac{3F}{F} = \frac{r^2}{r'^2}$

initially distance between charges was 8.45 cm

$3 = \frac{8.45^2}{r'^2}$

$r' = \frac{8.45}{\sqrt3}$

$r' = 4.88 cm$

so the distance between charges is 4.88 cm now

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3 years ago

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Answer:

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Suppose that you'd like to find out if a distant star is moving relative to the earth. The star is much too far away to detect a

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