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  1. ...of work done: John moved a box from A to B in 3... question?? have does work on something?....funny english...please check.......I give you $10, you get $10. Total transfer is...

  2. Q1: Potential energy of Mark, referrenced to B, when he is at O = 50g x (15 + 85) J = 50 000 J where g is the acceleration due to gravity, taken to be 10 m/s2 Hence, by conservation of energy, elastic potential energy in the string = 50 000 J...

  3. ...positive. By v = u + at v = 50 - 10(1) v = 40 ms-1 The answer is A . 3. The answer is B. The net force on the apple when it is in free fall is its weight, which is...

  4. ...lattice of +ve metal ions in a sea of delocalized ... are free to move and thus got the name "free electrons... property lies on the fact that most metal atoms...

  5. ...will even topple when it is at rest on the banking) 2010-07-25 16:57:39...and the symmetry axis about the bus, α = a /h h = height of CG above the ...qestion don't give enough information to get the exact anumerical answer. This time...

  6. 圖片參考:http://i.imagehost.org/0430/ScreenHunter_16_Apr_17_20_25.gif http://i.imagehost.org/0430/ScreenHunter_16_Apr_17_20_25.gif

  7. ...predict its speed and moving direction, say, after 1 s. ...idela gas model is a simplified mathematical.... Based on the listed assumptions, you would be able to get simple formulae for...

  8. ... serves as a cooling mechanism, otherwise the temperature of the lamp may get too hot. 2)藏在棉花和羽毛...the hot pot is free to move and could carries away the heat. On the other hand, air insode the...

  9. ... the car is moving along the road and the car engine...only net force acting on the car is the frictional...of the car. By -f=ma, a =-f/m,thus the car ...,the car get hot as the work done...

  10. ...would overestimate the actual displacement that travelled. That's why you got twice the amount of the actual kinetic energy. The correct derivation is...