A small 4.00 {\ m {\ m kg}} brick is released from rest 3.00 {\ m {\ m m}} above

Question

A small 4.00{ m { m kg}} brick is released from rest 3.00{ m { m m}} above a horizontal seesaw on a fulcrum at its center, as shown in the figure below (Figure 1) .

Part A. Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant the brick is released.

Part B. Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant before it strikes the seesaw.

A small 4.00{ m { m kg}} brick is released from rest 3.00{ m { m m}} above a horizontal seesaw on a fulcrum at its center, as shown in the figure below (Figure 1) . Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant the brick is released. Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant before it strikes the seesaw.

Explanation / Answer

part A.the angular momentum is

L1 = m x v x r1

where m = 4.00 kg,v = (2gh)^1/2,g = 9.8 m/s^2 and h = 3.00 m and r1 = (3.0^2 + 1.6^2)^1/2

part B.the angular momentum is

L2 = m x v x r2

where r2 = 1.6 m

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