In order to find the magnitude of force F, we have to solve a system of two equations with both F and the normal force N unknown. find an expression for F in terms of m, g, θ, and μs (no N).
Fcosθ−μsN=0
Fsinθ+N−mg=0

What produces a record of seismic waves? richter scale seismogram barometer seismograph

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

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?