A person on a scale rides in an elevator. If the mass of the person is 60 kg and the elevator accelerates upward with an acceleration of 5 m/s/s, what is the reading on the scale?

Which statement correctly describes the relationship between frequency and wavelength?

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?

If a simple machine reduces the strength of a force, what must be increased?