There is a force between two charges; if the distance between the two charges is doubled, by what factor does the force between them change?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Steelhead trout migrate up stream to spawn.occasionally they need to leap up small waterfalls to continue their journey. fortunately, steelhead are remarkable jumpers, capable of leaving the water at a speed of 8.0 m/s. a. what is the maximum height a steelhead trout can jump? b.leaving the water at 8.0 m/s, the trout lands on top of the water fall 1.8 m high. how long was it in the air?

How is the ideal mechanical advantage of a wheel and axle calculated?