What is the ratio of the electric force to the gravitational force between a proton and an electron separated by 5.3*10^-11m ( the radius of a hydrogen atom )
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A balloon rising vertically up with a uniform velocity 15 m s releases a ball at a height of 100 m. Calculate
the time taken by the ball to hit the ground ? g = 10 ms
pls help me to solve out.
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