When an object with an electric charge of -9.0uC is 4.0 cm from an object with an electric charge of 5uC , the force between them has a strength of 252.8 N . Calculate the strength of the force between the two objects if they are 12cm apart.

Round your answer to significant digits.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

1) a light bulb takes in 30 of energy per second. it transfers 3j as use energy. calculate the efficiency. second. it transfers 3j as useful light energy and 27j as heat energy. calculate the efficiency