A homogeneous structural steel (ASTM A36) rectangular bar moves on a non-smooth plane, inclined at an angle of 35°with respect to the horizontal (see figure). The block is of length, l _x =7 in, of height, l _y =2 in, and of width (into the plane of the figure), l _z =3 in. The coefficient of (kinetic) friction between the steel bar and the plane is 0.3. The coordinate system to be used is as shown in the figure.

1. At what distance along the plane from the lower-left corner of the bar does the resultant normal reaction force on the bar act?

2. If at one instant the velocity of the bar has a magnitude of 2.2 ft/s, what is the magnitude of the velocity after it has moved farther down the incline a distance of 3.8 ft?

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1 At what distance along the plane from the lowerleft corner of the bar does the resultant normal re... View the full answer