the speedof light is 3000000000 and the speed of sound in air is 340.an observer is 5000m away from a lighting discharge calculate the time to the observer of light from the lighting and sound from thunder​

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?

Can a molecule have bond dipoles but not have a molecular dipole?