A football running back of mass 90 kg moving at 5 m/s (positive direction) is tackled head on by another player of mass 120 kg running -4 m/s. They stick together. What is their final combined speed and direction (negative or positive sign)?

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Explain vector addition, triangle method and parallelogram method

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm