My daughter is having problems with the answer key to the NROC Ap Physics Chapter 2 test. The answer key seems to be wrong. The first question is:
A 45 kg block is at rest on a 40oslope. A force of 430 N is acting on the block up the slope parallel to it. The block does not slide up the slope, what is the minimum value of the coefficient of static friction between the block and the slope?
a. 0.528 b. 0.786 c. 0.273 d. 0.205
The answer is given as "c" but we get 0.436.
Are we doing something wrong?

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this can give u an idea if u are doing something wrong....

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