Answer:
The ratio of electric force to the gravitational force is 
Explanation:
It is given that,
Distance between electron and proton, 
Electric force is given by :
Gravitational force is given by :
Where
is mass of electron, 
is mass of proton, 
is charge on electron, 
is charge on proton, 
So, the ratio of electric force to the gravitational force is . Hence, this is the required solution.
It’s used in measuring distance from earth with other celestial object. Hope this helps mark brainest
Answer:
90 degrees
Explanation:
the answer is 90 because angle a has a square on the angle which means it is 90 degrees
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