Problem #4: The 15 kg slender bar, shown in figure, is rotating counterclockwise

Question

Problem #4: The 15 kg slender bar, shown in figure, is rotating counterclockwise in a vertical plane about a smooth pin at A. When the bar is in the position shown, its angular velocity is 10 radis. At this instant, determine the angular acceleration of the bar and the magnitude and direction of the force exerted on the bar by the pin at the support A. Problem #5: Two 400 mm diameter disks and a 240 mm diameter disk are jointed to form a spool as shown in figure. The 125 kg spool has a radius of gyration of 125mm with respect to the axis of the spool. If a force F of 500 N is applied to the spool through a cord that is wrapped around 240 mm disk, determine the acceleration a of the mass center of the spool and the angular acceleration of the spool if a) The horizontal surface is smooth (mu = 0). b) The horizontal surface is rough (mu = 0.25).

Explanation / Answer

The surface pictured at the right is an example of rill erosion.

Thus, the correct option is ( D )

Rill erosion is the removal of soil by concentrated water running through little streamlets, or headcuts. The breakup in a rill takes place if the sediment in the flow is below the quantity of load can transport and if the flow dominates the soil's resistance to detachment. If detachment is continues or flow increases, rills will become wider and deeper.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.