Recent content by MalcolmKee

Hi Sora, we're not supposed to giving direct answer, but instead guide the student. It is written in http://https://www.physicsforums.com/showthread.php?t=414380" . :-)

This part I don't understand why you're doing so, can you explain it?

I don't understand what does the original text discussing, anyway, I guess that your confusion is that why the right-hand side current source is pointing upwards, but the potential at the upper node is lower than the ground. I think that the reason is that the current source is not the only...

Sorry, I'm new here. I'll avoid repeating the mistake. :blushing:

I know they are the same point. That is the reason why electrical current will not flow to the upper side of the circuit. Instead, the current only exist in the lower mesh only. Do I get it wrong?:confused:

Hi, just some addition. Since the two node is connected, short circuit does happen. Therefore your calculation is not sound.

Hi all! An much simpler way to find the time taken for the object to lane is just using s = ut + 0.5at^2 (-30.8) = (23.8 sin 30')t + 0.5(-9.8)t^2 4.9t^2 - 11.9t - 30.8 = 0 Solving the quadratic equation we can get the time travel from starting point until it lands on the ground, then just...