a 980 kg roller coaster cart is traveling along a track at 17 m/s before it rolls down a 30 m tall hill (point a). what will be its kinetic energy
when it is halfway down the hill (15 m) at point b?

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.

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Name two kinds of practical electric pumps.