A uniform ladder weighs 20 lb. The vertical wall is smooth (no friction). The floor is rough and μs = 0.8. If the force P is causing tipping of the ladder, what is the normal force on the ladder at point B?

b.transmitters send radio waves, and receivers capture radio waves.

f=ma newton's second law 7x8=56n

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.