Q4- If the mass of cylinder A is 30 kg, determine the mass of cylinder C in order to hold the assembly in the position shown. 30 (25 Marks) D. A 30 kg
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- Nearly all conventional piston engines have flywheels on them to smooth out engine vibrations caused by the thrust of individual piston firings. Why does the flywheel have this effect?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.If you used an ideal pulley of the type shown in Figure 9.26(a) to support a car engine of mass 115 kg, (a) What would be the tension in the rope? (b) What force must the ceiling supply, assuming you pull straight down on the rope? Neglect the pulley system's mass.
- Draw a free body diagram to show how a diver gains angular momentum when leaving the diving board.Helicopters have a small propeller on their tail to keep them from rotating in the opposite direction of their main lifting blades. Explain in terms of Newton's third law why the helicopter body rotates in the opposite direction to the blades.2. The rock and meterstick balance at the 25 cm mark, as shown. The meterstick has a mass of 0.5 Kg. What must be the mass of the rock?
- Is there more than one way to get two objects with identical masses to balance? How? Provide an example.IP To determine the location of her center of mass, a physics student lies on a lightweight plank supported by two scales 2.50 m apart, as indicated in the figure (Figure 1). Assume the left scale reads 300 N, and the right scale reads 132 N. Find the student's mass. Find the distance from the student's head to her center of mass.A distracted truck driver does not notice that the car in front of him has stopped. After the impact the car (2 Mg) and the truck (5Mg) move forward as one rigid body. Answer the following questions . A B C D please and thank
- A thin 2.50 kg box rests on a 6.00 kg board that hangs over the end of a table, as shown in (Figure 1). How far can the center of the box be from the end of the table before the board begins to tilt?1.To balance a 35.5-kg automobile tire and wheel, a mechanic must place a 50.2-g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was its center of mass before the lead weight was added?Explain and labled the problem.If you want to hit a volleyball without making it spin, you must apply a force A) Acting below the center of massB) Acting above the center of massC) Acting through the center of massD) It is impossible to not make it spin A crowbar is used to remove a nail. The force that the worker applies is 220 N. If the force arm is 5 times the length of the resistance arm, then how much force is applied to the nail? A) 44 NB) 220 N C) 1100 ND) None of the above What is the centripetal acceleration of a wheel of radius 0.2m spinning with an angular velocity of 3 rev/sec? A) 0.6 m/s2 B) 1.2 m/s2C) 11 m/s2D) 71 m/s