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  1. ... the crucial point whether a real image can be formed. 2015-07-30 11:10:10 補充: Amendment to answer to Q5: Objects placed within the focal length of a lens (irrespective it is a convex or concave lens), the image formed is virtual. Hence, it cannot be captured on a screen. 2015-08-02 19:41:39 補充: Yoour suppl question. 1. Mass of water boiled away= (2 - 0.5) kg...

  2. ...under an attractive field, the higher the orbit, the more is the total energy. But the same principle holds ... 2015-07-01 21:02:49 補充: (cont'd)... When particle A changes its orbit from...

  3. ...400) i.e. nx/ny = 2 x 400/200 = 4 Because mass of gas is proportional to the no. of moles, hence, mass of gas in X/mass of gas in Y = 4...

  4. 1. The question clearly says that the ruler is metallic and John holds it with his bare hand. As such, the ruler is earthed. Any charge that produced...

  5. ... on by another force. Just think of the string behaves like a spring.When you grip (or hold tightly) the middle part of the spring, you could extend the two sides of the spring to different lengths,i.e. different...

  6. ..., which is larger than the critical angle (臨界角), the Law of Reflection holds . Therefore, the reflected angle is 46 degrees (NOT 89 degrees...

  7. ...the pushing force is in additional to the weight of the ball, which the player needs to exert in holding the ball. Also, air resistance has been neglected in the calculation. The actual...

  8. ...1. It depends on the airlines. Some do prefer not to invest on teaching cadets or potential pilots how to fly. 2. These...

  9. ...in equilibrium (平衡), net force (淨力) acting on them are zero. Tension in the string holding the parcel = 10g N = 100 N where g is the acceleration due to gravity(重力加速度) , taken...

  10. (1) A magnifying glass is a convex lens. (2) Since the stamp is held at a distance of 8 cm from the lens which is shorter than the focal length of the lens (10 cm), the image...