A 10,000 kg car going north at 22 m/s collides with a 50,000 kg truck moving east at 25 m/s. The two vehicles stick together and move in a northeastern direction. With what speed do they move right after impact and in what direction (degrees northeast)?

The de broglie relation λ=h/p can be rewritten in terms of the wave number k as p=kℏ. recall that wave number is defined by k=2π/λ. using the fact that λ=v/f, find the wave numbers k1 and k2 corresponding to frequencies f1 and f2. express your answer as two expressions

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge