For Question 2 realize that you need to account for the effect of the person: either they are falling with the plank (so they apply their weight to the plank and add to its rotational inertia) or they are not (so their force on their board is not equal to their weight but they do not increase the rotational inertia). You may solve this either way--they both give the same answer. Question 1 1 pts A heavy, 6 m long uniform plank has a mass of 30 kg. It is positioned so that 4 m is supported on the deck of a ship and 2 m sticks out over the water. It is held in place only by its own weight. You have a mass of 70 kg and walk the plank past the edge of the ship. How far past the edge do you get before the plank starts to tip, in m? Question 2 If you go 10 cm past the point determined above, what is the angular acceleration of the board in rad/s²? 1 pts

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For Question 2 realize that you need to account for the effect of the person: either they are falling with the plank (so they
apply their weight to the plank and add to its rotational inertia) or they are not (so their force on their board is not equal
to their weight but they do not increase the rotational inertia). You may solve this either way--they both give the same
answer.
Question 1
1 pts
A heavy, 6 m long uniform plank has a mass of 30 kg. It is positioned so that 4 m is supported on the
deck of a ship and 2 m sticks out over the water. It is held in place only by its own weight. You have a
mass of 70 kg and walk the plank past the edge of the ship. How far past the edge do you get before
the plank starts to tip, in m?
Question 2
If you go 10 cm past the point determined above, what is the angular acceleration of the board in
rad/s²?
1 pts
Transcribed Image Text:For Question 2 realize that you need to account for the effect of the person: either they are falling with the plank (so they apply their weight to the plank and add to its rotational inertia) or they are not (so their force on their board is not equal to their weight but they do not increase the rotational inertia). You may solve this either way--they both give the same answer. Question 1 1 pts A heavy, 6 m long uniform plank has a mass of 30 kg. It is positioned so that 4 m is supported on the deck of a ship and 2 m sticks out over the water. It is held in place only by its own weight. You have a mass of 70 kg and walk the plank past the edge of the ship. How far past the edge do you get before the plank starts to tip, in m? Question 2 If you go 10 cm past the point determined above, what is the angular acceleration of the board in rad/s²? 1 pts
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