The gravitational constant g was first measured accurately by henry cavendish in 1798. he used an exquisitely sensitive balance to measure the force between two lead spheres whose centers were 0.19 m apart. one of the spheres had a mass of 188 kg, while the mass of the other sphere was 0.63 kg. what was the ratio of the gravitational force between these spheres to the weight of the lighter sphere?

Explanation:

given,

distance between two led sphere = 0.19 m

mass of sphere

m₁ = 188 Kg

m₂ = 0.63 Kg

ratio of gravitational force between to the weight of light sphere

W = m g

now,

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me