In the early 1900s, Robert Goddard proposed sending a rocket to the moon. critics took the position that in a vacuum such as exists between earth and the moon, the gases emitted by the rocket would having nothing to push against to propel the rocket. to settle the debate, Goddard placed a gun in a vacuum and fired a blank cartridge from it. (a blank cartridge fired only the hot gases of the burning gunpowder.) what happened when the gun was fired?

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?