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  1. ...α) = g sin2 α downward. Initial vertical velocity = u sin α upward So applying the equation in vertical direction: 0 = (u sin α)t - (g sin2 α)t2/2 since when the ball...

  2. ...which does not involve in any collision. Therefore, only one direction can apply the newton's law of restitution and so the components of velocities...

  3. In fact, after 5 seconds, both X and Y can only be in the odd units from the origin. That is, X and Y can only be at -5, -3, -1, 1, 3 or 5 units from the origin. Take to the right be positive. To calculate the probability that Y will...

  4. 圖片參考:http://i117.photobucket.com/albums/o61/billy_hywung/Nov08/Crazyapp1.jpg 圖片參考:http://i117.photobucket.com/albums/o61/billy_hywung/Nov08/Crazyapp2.jpg aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...

  5. Please look at the followings. 圖片參考:http://i601.photobucket.com/albums/tt95/physicsworld9999/physicsworld02Mar180853.jpg?t=1237337705 圖片參考:http://i601.photobucket.com/albums/tt95/physicsworld9999...

  6. Moment of inertia of a solid disc, I = 1/2 ma^2 Let N be the normal reaction on the disc. Let the potential energy be zero at the horizontal radius of the cylinder. Since the disc rolls without slipping, hence there is no energy...

  7. Suppose that the plane is steered in the direction with an acute angle α to AB (counted in opposite sense to θ) so that the plane's resultant velocity in perp. to AB is zero, i.e. w sin θ = v sin α ... (1) Then in forward journey, the resultant velocity is: v...

  8. You would try it ga..................might be you should do the International English test for prove your English standard ITELS , TOEFL....................... English should be very important for pilot, cos they need to commuicate with diff airport by...

  9. 首先, 請見以下加了力和加速度的圖: 圖片參考:http://i117.photobucket.com/albums/o61/billy_hywung/Apr08/Crazyapp3.jpg 對以上的代號, 我們標記為: a = 8 kg 的加速度 a' = 2 kg 和 3 kg 相對滑輪 2 的加速度. T = 作用在 2 kg 和 3kg 的張力 2T = 作用在滑輪 1...

  10. G should be in terms of k, i.e. the vector in direction perp. to the xy-plane Moment of first force about the origin: | i  j k| |11 25 0|=-75k | 3  0 0...

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