thanks so much. i was thinking about that too! by the way, can you
tell me why a hydroelectric generator device wastes energy? the
question goes something like "the water supplies 2000J of energy
every second to the wheel. the electrical energy output is 1200 J
every second.
1 way which it wastes energy is perhaps through the loss of
thermal energy i suppose. during the conversions of different forms
of energy, there is bound to be some energy which is lost as heat
energy. what is the second reason? i can't think of another.
and there;s this question. if is of a car moving on a horizontal
section until it reaches a ramp and moves downwards. length of the
ramp is 0.9 m .
(ii) the car has 0.30 J of kinetic energy at the topof the ramp
and loses 0.50 of potential energy as it moves to the bottom of the
ramp. calculate kinetic energy of car at bottom of the ramp.
i tried to equate using principle of conservation of energy.
Ok I think eagle will kill me if i keep on taking his lobang...
hehe BUT he is the best in physics here...
Nevertheless, these are my thoughts...
(i) 1) Energy is needed to overcome the inertia of the
wheel so energy is wasted.
2) Like what u said.... energy is lost
in form of sound, heat and so on energy.
ii) is 0.50J of PE or 1/2 of PE loss? Be accurate in ur
question.
if 0.50J, then follow secretliker
if 1/2, then follow agriatoast.
