A uniform rod ofmass 1.4 kg is 11mlong. The

rod is pivoted about a horizontal, frictionless

pin at the end of a thin extension (of negligible

mass) a distance 11 m from the center of

mass of the rod. Initially the rod makes an

angle of 58◦ with the horizontal. The rod is

released from rest at an angle of 58◦ with the

horizontal, as shown in the figure below

11 m

11 m

1.4 kg

O

58◦

What is the magnitude of the vertical reac-

tion force of the rod on the pivot at the instant

the rod is in a horizontal position? The accel-

eration of gravity is 9.8 m/s2 and the moment

of inertia of the rod about its center of mass

is

1

12

mℓ2.

Answer in units of N.

rod is pivoted about a horizontal, frictionless

pin at the end of a thin extension (of negligible

mass) a distance 11 m from the center of

mass of the rod. Initially the rod makes an

angle of 58◦ with the horizontal. The rod is

released from rest at an angle of 58◦ with the

horizontal, as shown in the figure below

11 m

11 m

1.4 kg

O

58◦

What is the magnitude of the vertical reac-

tion force of the rod on the pivot at the instant

the rod is in a horizontal position? The accel-

eration of gravity is 9.8 m/s2 and the moment

of inertia of the rod about its center of mass

is

1

12

mℓ2.

Answer in units of N.

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