A small 0.300kg bird is flying horizontally at 3.50m/stoward a 0.750kg thin bar

Question

A small 0.300kg bird is flying horizontally at 3.50m/stoward a 0.750kg thin bar hanging vertically from a hook at its upper end, as shown in the figure below (Figure 1)

Part A

When the bird is far from the bar, what are the magnitude and direction (clockwise or counterclockwise) of its angular momentum about a horizontal axis perpendicular to the plane of the figure and passing through point A?

L =   kg?m2/s

Part B

When the bird is far from the bar, what are the magnitude and direction (clockwise or counterclockwise) of its angular momentum about a horizontal axis perpendicular to the plane of the figure and passing through point B?

L =   kg?m2/s

Part C

When the bird is far from the bar, what are the magnitude and direction (clockwise or counterclockwise) of its angular momentum about a horizontal axis perpendicular to the plane of the figure and passing through point C?

L =   kg?m2/s

Part D

When the bird is just ready to hit the bar, but is still flying horizontally, what are the magnitude and direction (clockwise or counterclockwise) of its angular momentum about a horizontal axis perpendicular to the plane of the figure and passing through point A?

L =    kg?m2/s

Part F

When the bird is just ready to hit the bar, but is still flying horizontally, what are the magnitude and direction (clockwise or counterclockwise) of its angular momentum about a horizontal axis perpendicular to the plane of the figure and passing through point C?

L =   kg?m2/s

Let counterclockwise angular momentum be positive, clockwise angular momentum be negative. For all Problems listed above.

Please show work.

Explanation / Answer

Answer

PART- A

angular momentum = linear momentum * normal (perpendicular) distance to the line of motion:

Linear momentum = 0.300*3.50

distance to A = 1.50 m

angular momentum = 1.58 kg*m

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