Recent content by cheahchungyin

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    A plane flying at 220m s-1 at a height of 300m

    ya you can say that :). just that from this case we deduce the time taken first, then deduce the appropriate horizontal distance
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    Tension in ropes w/o acceleration or friction

    eh? (67+11)9.8 sin(39) is for the string connecting M2 to wall and for the second equation, its not 67 but 11. so, 11(9.8) sin39
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    Work Done ON or BY the System [Conceptual Question]

    Imagine pushing a box. Work is done ON the box, but BY who? Ya, BY you. You are exerting kinetic energy towards the box to make it move :) Imagine putting food into oven. Work is going to be done ON the food (To cook it) BY the oven. Note: There is only heat energy, no "cold" energy. So when...
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    Solving Pulley Systems with Multiple Masses and Angles

    Oh haha! The problem is I didn't know what's the purpose of the angle, so I got confused lol. Thanks too that I learned something here :D
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    Tension in ropes w/o acceleration or friction

    (M1+M2)g sin(39)=Tension connecting M2 to the wall. <---Because the string have to support two weights at and angle. (M1)g sin(39)=Tension connecting M1 to M2. <--- Because the string only supports one weight at an angle
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    Solving Pulley Systems with Multiple Masses and Angles

    Okay sorry for being not able to help. got a little confused
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    Solving Pulley Systems with Multiple Masses and Angles

    hmmm... did I miss something... >.< try 248.7
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    Solving Pulley Systems with Multiple Masses and Angles

    Do you have the answer sheet? what's the correct answer?
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    Solving Pulley Systems with Multiple Masses and Angles

    m1 won't take any account unless it has friction.
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    Solving Pulley Systems with Multiple Masses and Angles

    Its the same string without any node. any pull on the other side will affect the whole string right?
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    Solving Pulley Systems with Multiple Masses and Angles

    In this situation, since all the tensions are from the same string, T1=T2=T3=T
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    A plane flying at 220m s-1 at a height of 300m

    Nubcake, draw it out and u'll find it clearer :)
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    A plane flying at 220m s-1 at a height of 300m

    Ya, you think we should find the time taken to reach the horizontal distance right? :) You have to imagine here. Since in reality the object is dropping diagonally, it is falling vertically and horizontally simultaneously. The time taken to reach the vertical distance will be the same to reach...
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    Finding acceleration of truck from a hung mass on the ceiling of it.

    No-Problem! XD
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    Finding acceleration of truck from a hung mass on the ceiling of it.

    tan-1(a/g)=22° Look it like a triangle. the angle is 22 theta, the vertical component is g, the horizontal is a.