4. A bullet fired into a block of wood to determine the speed of the bullet. The block is attached by a rod to a low friction axle. The bullet becomes embedded in the wood and the maximum angle the rod rotates is measured. a. Use the numbers in the diagram to determine the speed of the bullet before it hit the block of wood. Hint: use the angle to determine the speed of the block and bullet just after the bullet becomes embedded in the wood. 30° 0.8 m D> 0.8 kg 4 gram: b. How much mechanical energy was lost during the collision? Comment: You should find that most of the mechanical energy was lost. =====:::

4. A bullet fired into a block of wood to determine the speed of the bullet. The block is attached by a rod to a low friction axle. The bullet becomes embedded in the wood and the maximum angle the rod rotates is measured. a. Use the numbers in the diagram to determine the speed of the bullet before it hit the block of wood. Hint: use the angle to determine the speed of the block and bullet just after the bullet becomes embedded in the wood. 30° 0.8 m D> 0.8 kg 4 gram: b. How much mechanical energy was lost during the collision? Comment: You should find that most of the mechanical energy was lost. =====:::

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter2: Motion In One Dimension

Section: Chapter Questions

Problem 8P: A child rolls a marble on a bent track that is 100 cm long as shown in Figure P2.8. We use x to...

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A propeller consists of two blades each 3.0 m in length and mass 120 kg each. The propeller can be approximated by a single rod rotating about its center of mass. The propeller starts from rest and rotates up to 1200 rpm in 30 seconds at a constant rate. (a) What is the angular momentum of the propeller at t=10s ; t=20s ? (b) What is the torque on the propeller?
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Casting molten metal is important in many industrial processes. Centrifugal casting is used for manufacturing pipes, bearings, and many other structures. A variety of sophisticated techniques have been invented, but the basic idea is as illustrated in Figure P4.35. A cylindrical enclosure is rotated rapidly and steadily about a horizontal axis. Molten metal is poured into the rotating cylinder and then cooled, forming the finished product. Turning the cylinder at a high rotation rate forces the solidifying metal strongly to the outside. Any bubbles are displaced toward the axis, so unwanted voids will not be present in the casting. Sometimes it is desirable to form a composite casting, such as for a bearing. Here a strong steel outer surface is poured and then inside it a lining of special low-friction metal. In some applications, a very strong metal is given a coating of corrosion-resistant metal. Centrifugal casting results in strong bonding between the layers. Suppose a copper sleeve of inner radius 2.10 cm and outer radius 2.20 cm is to be cast. To eliminate bubbles and give high structural integrity, the centripetal acceleration of each bit of metal should be at least 100g. What rate of rotation is required? State the answer in revolutions per minute.
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