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  1. don 相關
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  1. ... Law. 2015-07-29 20:21:42 補充: Your further question: I don 't know where you get this equation: momentum =f(time), but it is not correct...

  2. 1. This follows the definition in mechanics. Potential energy for repulsice force is +ve and for attractive force is -ve. The reason behind is that wok needs to be done when two +ve charges come near to each other, and -ve work...

  3. ...must be 0'C, as ice and water are in thermal equilibrium. You don 't need to do any calculation at all. Just answer the question by argument...

  4. ... between two photons? Ans: Nothing, as photons don 't have mass,electric charge,colour charge

  5. In brief, "electric potential" is analogous to "height" in mechanics (i.e. in a gravitational field). 1. V = U/q is the definition of potential, i.e. energy per unit charge. As said above, the analogy in mechanics is : h = (mgh)/mg where h...

  6. Why not read materials on the web. The following physics web-sites are useful: 1. Hyper-physics: http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html There is also a link from this site to topics...

  7. ...m Hence, average velocity = displacement/time = 0/100 m/s = 0 m/s 2. I don 't know wthether there is a typo at your question. Is it 4 m...

  8. ...momentum of the rocket by the water is pointing opposite, upwards. You don 't need to mix up and misunderstand the rocket and water, they can be analysed...

  9. 1. Let N be the normal reaction and Ff be the frictional force. Hence, consider the horizontal components, we have N.sin(5) + Ff.cos(5) = 2400 x 10^2/60 i.e. N.sin(5) = 4000 - Ff.cos(5) ------------ (1) Consider the vertical components...

  1. don 相關
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