The graph below shows the potential energy and kinetic energy of a falling rock at a single point in time. If energy is conserved and there is no air resistance, which graph best shows the potential and kinetic energy at a later time in the rock's fall?

What happens to light waves from a star as the star moves away from earth?

Explain vector addition, triangle method and parallelogram method

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.