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April 16, 2014

Homework Help: Physics

Posted by QUESTION on Thursday, August 20, 2009 at 6:10pm.

ok part (b)

A 4.0 kg block is stacked on top of a 12.0 kg block, whcih is accelerating along a horizontal table at a = 5.2 s^-2 m. Let Mu k = Mu s = Mu.

(a) What mininum coefficent of friction Mu between the two blocks will prevent the 4.0 kg block from sliding off?

(b) If Mu is only half this mininium vale, what is teh acceleration of the 4.0 kg block with respect to the table, and

(c) with respect to the 12.0 kg block?

(d) What is teh force taht must be applied to the 12.0 kg block in (a) and in (b), assuming that the table is frictionless?

for (a) I got .66

ok for (b) I got 3.2 s^-2 m

for (c) I got 2.0 s^-2 m

And I don't understand what the problem means by

"(d) What is the force taht must be applied to the 12.0 kg block in (a) and in (b), assuming that the table is frictionless?"

Does this mean that for (a) the bottom block experiances a force of kinetic friction were Mu is the same Mu i found in part(a) of .66????

part (b) is frictionless with the table... I know how to do that just don't understand what the other part is asking??????

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