A 3.10 kg block is pushed along the ceiling with an constant applied force of F = 86.5 N that acts at an angle = 52° with the horizontal, as in the figure below. The block accelerates to the right at 6.02 m/s2. Determine the coefficient of kinetic friction between the block and the ceiling.
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A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 184.0 N at an angle of 30° with the horizontal. The box has a mass of 31 kg, and the coefficient of kinetic friction between the box and the floor is 0.45. Find the acceleration of the box.v
2007-12-02 12:50:00 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Physics
1) the force of friction is
(86.5*sin(52)-3.10*9.81)*µk
54.9*µk
setting up F=m*a
86.5*cos(52)-54.9*µk=3.10*6.02
solve for µk
µk=0.630
2) The force of friction is
(31*9.81-184*sin(30))*0.45
95.45 N
setting up F=m*a
184*cos(30)-95.45=31*a
solve for a
a=2.06 m/s^2
j
2007-12-03 05:03:05 · answer #1 · answered by odu83 7 · 0⤊ 0⤋