Olympic weightlifter Zoe Smith lifts a 58 kg barbell over her head, 2.1 meters above the ground in 0.6 sec. How much power must she generate to lift the barbell from the ground?
a) 0 W
b) 58 W
c) 120 W
d) 720 W
e) 1990 W
Olympic weightlifter Zoe Smith lifts a 58 kg barbell over her head, 2.1 meters above the...
Sarah is holding a 20 kg dumbbell over a 30-meter high cliff (32 meters from her hands to the ground). Just as she releases the dumbbell, it has a potential energy of 6272 J and kinetic energy of 0 J. However, just as the dumbbell hits the ground, how much potential and kinetic energy does it have?