25.0 Bird cm Hinge
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A 500.0 g bird is flying
horizontally at 2.25 m/s, not
paying much attention, when it suddenly
flies into a stationary vertical
bar, hitting it 25.0 cm below the top
(Fig. ). The bar is uniform,
0.750 m long, has a mass of 1.50 kg,
and is hinged at its base. The collision
stuns the bird so that it just
drops to the ground afterward (but
soon recovers to fly happily away).
What is the
and (b) just as it reaches the ground?
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- A honzoatal plank 4.32m long and having mass 25.2 rests on two pivots, one at the /eft end and a seco ad 10 gm from the ryht end. tind Magnitide of the foree exerted on the plank by the second Avot N.Two kids are playing on a seesaw on the school playground. The first kid (of mass 50 kg) sits 2 meters from the fulcrum. The other child (who has a mass of 70 kg) sits on the other side of the seesaw. How far away from the fulcrum does the second child need to sit in order to balance the seesaw? Assume that the seesaw itself is weightless. O 0.79 m O 1.43 m O 1.03 m O 2.24 mA schoolyard teeter-totter with a totallength of 6.4 m and a mass of 41 kg is pivoted at its center. A 21-kgchild sits on one end of the teeter-totter. (a) Where should a parentpush vertically downward with a force of 210 N in order to hold theteeter-totter level? (b) Where should the parent push with a force of310 N? (c) How would your answers to parts (a) and (b) change if themass of the teeter-totter were doubled? Explain
- The crew on peg leg Petes' ship have mutinied. Now Pete finds himself walking the plank. The plank is 4.5m long and has a mass of 13kg. 3.6 meters of the plank extend out over the waters. The plank pivots on a small rail at the edge of the ship, this is the only point of the plank in direct contact with the ship. The remaining meter of the plank is held in place over the deck by the metal bar. The bar is .6m from the pivot. If Pete has a mass of 111kg, what is the torque provided by the bar when Pete is at the end of the plank?A 0.643 kg cat sits at the end of a 15.7 kg, 11.2 m long beam. An accident occurs and the support cable breaks, causing the beam to rotate without friction until it hits the wall. If the cat held onto the end of the beam what would its speed be as it impacts the wall? (however, it is smart and jumps off part way down)A 550.0 g bird is flying horizontally at 2.50 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it 25.0 cm below the top. The bar is uniform, 0.700 m long, has a mass of 1.50 kg kg, and is hinged at its base. The collision stuns the bird so that it just drops to the ground afterward (but soon recovers to fly happily away). What is the angular velocity of the bar just after it is hit by the bird? Express your answer in radians per second. W1 = rad/s