A 400-N crate rests on a ramp; the maximum angle just before it slips is 15.0 with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
a. 3.7
b. 0.47
c. 2.1
d. 0.27
e. 0.40
Question 2
A 7.00-kg mass is placed on a 28.0 incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.574, and the coefficient of sliding friction is 0.528 . What is the frictional force in this situation?
a. 32.2 N
b. 60.6 N
c. 32.0 N
d. 34.8 N
e. 3.29 N
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