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  1. ...1000 V and -400 V respectively. They are very far apart so that we can assume that there is no electrostatic interaction between the two ...

  2. Impulse F.(Δt) can be positive or negative, depending on the direction of force. 2015-07-28 16:15:35 補充: Your suppl question: The rate of change of momentum is proportional to the applied force. This is Newton's...

  3. I am not sure if I have figured out the diagram correctly. Why not post the diagram here. I suppose there is a pair of supply cables providing electricity to two identical transformers, one to the left and one to the right. The output of each...

  4. An object is at rest or in motion is a relative concept, depending on the Inertia Reference System that the observer is in. As said in the Theory of Special Relativity, all laws of...

  5. ...s Law gives that the induced current must flow in a direction so as to oppose the increase of magnetic flux. As such, the induced current...

  6. 1. The soft iron, being a ferromagnetic substance, can concentrate magnetic field lines. As such, the magnetic flux density of the electromagnetic will increase, leading to an increase in strength of the electromagnet. 2. Any ferromagnetic substance can achieve the same effect as soft iron...

  7. Is there a diagram on this question? The magnitude of the electric force depends on the electric field intensity. You need to look at the "spacing" between field lines. 2015-05-26 15:28:45 補充: Reference to your suppl information on the question...

  8. ...0.05 --------take g=10 m/s^2 t=0.2236 s so , v=1.35/0.2236 =6.04 m/s 1(b) (0.40-0)=0...b) horizontal speed=20*cos 27° =17.8 m/s so horizontal distance=17.8*5.89=105 m 2(c) the horizontal speed...

  9. 1. Let R be the resistance of each light bulb, and r be the resistance of the resistor. Hence, voltage across bulb R before switch is closed = V.[R/(R+r)] -------------- (1) where V is the voltage of the supply. After the switch is...

  10. It sounds like you have enrolled a qualified program for fewer hours. In answering your questions: 1. You will have to perform revenue flights as a CPL to make up the difference. 2. It...