Q1.In a belt drive the motor pulley has a diameter of 250 mm and rotates at 420 RPM. The machine pulley diameter is 350mm. 1. Determine the linear velocity of the belt and the rotational frequency of...

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Q1.In a belt drive the motor pulley has a diameter of 250 mm and rotates at 420 RPM. The machine pulley diameter is 350mm. 1. Determine the linear velocity of the belt and the rotational frequency of the machine pulley. 12 1. If the motor pulley accelerates from rest at 2 how long does it take the motor pulley to reach 420 RPM. Q2.A lift raises 50 castings at 12 kg per casting to a height of 4.8m in a time of 3 minutes. Calculate the power of the lift. Copied under Part VB http://www.examstutor.com/physics/resources/studyroom/mechanics/forces_in_equilibrium/ Accessed 04/04/2016 Q3.A constant force of 100N is being applied to the end of a spanner shown in the diagram below. How much power is being used to tighten the nut three complete turns if it takes 10s to complete this operation? X=100mm F=100N Q4.An output shaft of an electric motor rotates at 1450 rpm and produces a torque of 81Nm. What is the shaft power? Determine the energy consumed in 25 seconds. Q5.Determine the potential energy of a mass of 40kg if it is 15m above the ground. Determine the velocity of the mass just before it hits the ground. Q6.If a body of mass 900kg is travelling at 80km/hr, determine its kinetic energy. Q7.A forging hammer of mass 200kg falls from a height of 1.4 m, neglecting any losses, determine the energy released by the hammer and the velocity it strikes the anvil. Q8.A flywheel of mass 510 kg and radius of 500 mm accelerates from rest to 650 RPM in 35 seconds. 1. Determine the angular acceleration of the flywheel and the work done to reach this speed. 1. If the drive shaft is disconnected from the flywheel, how long will it take the flywheel to come to rest if the frictional torque on the flywheel shaft is 35 Nm? Q9.A flywheel with mass moment of inertia of 18 kg rotates at 370 RPM, the speed of the flywheel is then increased by 30 RPM. Determine the change in its kinetic energy. Q10.A wrecking ball of mass 190 kg, strikes a concrete pile from a vertical height of 5 m. Determine the velocity that it strikes the pile with, and the energy released if it reaches a height of 2 m after striking the pile. It strikes the pile when it is at its lowest point. Part B Q1.A machine raises a load of 900N by means of an effort of 150N. The distance moved by the load is 300mm and the effort moves through a distance of 2300mm in the same time. 1. Calculate the efficiency of the machine at this load. 1. Calculate the frictional effort for this load. Q2.The following table gives values of load and effort from an experiment on a machine. VR=5. 1. Draw the Load / Effort graph and determine the law of the machine from the graph. 1. What is the effort required to lift a load of 4.5kN. Use the law of the machine equation. 1. What is the limiting efficiency of this machine? Load- kN 1 2 3 4 5 6 Effort- kN 1.35 1.7 2.1 2.4 2.65 2.95
Answered Same DayMay 14, 2021

Answer To: Q1.In a belt drive the motor pulley has a diameter of 250 mm and rotates at 420 RPM. The machine...

Rahul answered on May 18 2021
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