10 A uniform rod XY has weight| 20 N and length 90 cm. The rod rests on two parallel pegs, with X above Y, in a vertical plane which is perpendicular to the axes of the pegs, as shown in the diagram. The rod makes an angle of 30° to the horizontal and touches the two pegs at Pand Q. where XP = 20 cm and XQ = 60 cm. a Calculate the normal components of the forces on the rod at Pand at Q. 20 cm 40 cm 30 cm 30 The coefficient of friction between the rod and each peg is µ. b Given that the rod is about to slip, find u.
10 A uniform rod XY has weight| 20 N and length 90 cm. The rod rests on two parallel pegs, with X above Y, in a vertical plane which is perpendicular to the axes of the pegs, as shown in the diagram. The rod makes an angle of 30° to the horizontal and touches the two pegs at Pand Q. where XP = 20 cm and XQ = 60 cm. a Calculate the normal components of the forces on the rod at Pand at Q. 20 cm 40 cm 30 cm 30 The coefficient of friction between the rod and each peg is µ. b Given that the rod is about to slip, find u.
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Transcribed Image Text:10 A uniform rod XY has weight
20 N and length 90 cm. The rod
rests on two parallel pegs, with
X above Y, in a vertical plane
which is perpendicular to the
axes of the pegs, as shown in
the diagram. The rod makes an
angle of 30° to the horizontal
and touches the two pegs at
P and Q, where XP = 20 cm and XQ = 60 cm.
20 cm
40 cm
30 cm
30
a Calculate the normal components of the forces on the rod at P and at Q.
The coefficient of friction between the rod and each peg is µ.
b Given that the rod is about to slip, find µ.
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