physics

a block (mass m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to as second block (m2), which hangs vertically.

Ignore friction and the masses of the pulley and cord.

If m1 = 13.0 kg and m2 = 6.0 kg determine the accleeration of each block

for this I got about 3.09 s^-2 m

If initally m1 is at rest 1.250 m from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely?

for this I got about .90 s

ok this part I need help and possibly the other ones that I just did...

If m2 = 1.0 kg how large must m1 be if the acceleration of the system is to be kept at 100^-1 g

I imediately threw up the flag here because acording to our book the text says when g is not given use the magnitude of 9.80 so I took 100^-1 of that magnitude and got exactly 99 kg

can someone please confirm these answers?

Thank you!

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  1. The answers are correct. In the last part, your answer does not depend on your choice for g. If you leave it undetermined it will factor out of your equations.

    I think you should practice a bit with more complicated problems. I think that you get bogged down a bit too much in elementary math and that prevents you from mastering the actual physics.

    A good problem would e.g. be to take the cord to be elastic such that the tension in the cord is given by
    c(L-L0), where L is the length of the cord.

    Write down the differential equations for the position of the two masses in this case. What are the initial conditions if mass 1 is held in place and mass 2 hangs and then we suddenly release mass 1 at t = 0?

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  2. Actually, this problem would be a bit too complicated as the tension in the string would not be uniform.

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  3. I'm confused, there is no explanation here and I REALLY need help on it!

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