7. Understand and apply the concept of rolling resistance. (CO-5)
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- Plywood Manufacturing . A product engineer wants to optimize the cutting of strips of wood, which are used to make plywood. To cut the wood strips, the log is held in place by chucks which are inserted at each end. The log is then spun while a saw blade cuts off a thin layer of wood. The engineer measures the torque that can be applied to the chucks before they spin out of the log, under different conditions of log diameter, log temperature, and chuck penetration. Introduction and objective for this topic.1. Consider the following parts: A. Barth Bumblebutt has an older uni-system harvest tractor. The machine picks 4 - 36” rows of corn, and the engine divides its 135 hp output between the propulsion drive, corn head, and the separator. The corn head requires 8.5 hp per row to operate effectively. The separator requires 38.5 hp / mph of ground speed, and the rolling resistance of the machine requires 23.7 hp / mph to overcome. What is the maximum speed that Barth can shell corn? B. Barth switches to 30” rows and needs to upgrade his farming system. Billy finds a neighbor that has a six row corn head for the uni-system that he no longer uses and will sell cheaply. It doesn’t fit Barth’s harvest tractor right, and Billy and Barth have to do significant modification with the cutting torch and welder to make things work. It is heavier, and they have to re-ballast the tractor. The rolling resistance rises to 31.3 hp / mph. The corn head has seen better days. It requires 11.0 hp per row to…480 ft-lbf First Gear (2.66) Final Drive (3.42) Axle Torque Thrust Force Figure 2 - Corvette Z06 and its transmission schematic. You start by measuring the 60-0 mph braking performance, which is accomplished along 30.56 m. The test weight (including the driver) was found to be 1510.5 kgf. 1) "Fuel is spent to make the vehicle go uphill, as you are aware. However, the fuel will not be restored if the vehicle is brought back from the hilltop to the initial elevation level."ANALYSE this statement under the laws of Thermodynamics.
- . A pulley used to transmit power by means of ropes has a diameter of 3.5 m and has grooves of 45° angle. The angle of contact is 160° and coefficient of friction between the ropes and groove sides is 0.3. The maximum possible tension in the rope is 1000 N ad the mass of rope is 1.5 kg per metre length. What is the speed of the pulley in rpm and the power transmitted if the condition of maximum power prevail? 10The following particulars apply to an inclined belt conveyor: Length of conveyor (loading end to discharge end): 100 mSpeed of belt: 1,5 m/sAngle of wrap around driving pulley: 220 degreesCoefficient of friction between belt and driving pulley: 0,3 Mass of rock conveyed (mass flow rate): 300 t/hThe discharge end is 22 m higher than the loading end. The total friction is equivalent to a force of 6,5 kN in the belt at the head pulley. The efficiency of the drive is 90%. 4.2.1 Calculate the power of the motor. 4.2.2 Calculate the minimum tension in the slack side of the belt as it leaves the driving pulleyUse graph above Two blocks are positioned on surfaces, each inclined at the same angle of 57.6 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 6.42 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.560. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the RIGHT at an acceleration of 1.5 m/s^2? 4.55 kg 2.03 kg 1.94 kg 2.50 kg
- Which type of clutch/brake is depicted in the figure below? 10⁰ O A. Internal expanding rim clutch/brake O B. External contracting rim clutch/brake OC. Band-type clutch/brake O D. Axial clutch/brake OE. None of the aboveHelp | System Announcements PRINTER VERSION 1 BACK NEXT Chapter 08, Problem 063 The cable of the 1600 kg elevator cab in the figure snaps when the cab is at rest at the first floor, where the cab bottom is a distanced = 2.8 m above a spring of spring constant k = 0.30 MN/m. A safety device clamps the cab against guide rails so that a constant frictional force of 5.1 kN opposes the cab's motion. (a) Find the speed of the cab just before it hits the spring. (b) Find the maximum distance x that the spring is compressed (the frictional force still acts during this compression). (c) Find the distance (above the point of maximum compression) that the cab will bounce back up the shaft. (d) Using conservation of energy, find the approximate total distance that the cab will move before coming to rest. (Assume that the frictional force on the cab is negligible when the cab is stationary.) (a) Number Units (b) Number Units (c) Number Units (d) Number Units LINK TO TEXT LINK TO SAMPLE PROBLEM…QUESTION #1a A wheel and axle machine is designed to function with an effort of 40 N force. The weight experienced by the axle od diameter 30 mm is 260 N and the efficiency of the system is 0.78. Find the following; ✓ Mechanical advantage ✓ The wheel diameter ✓ The ideal effort QUESTION #1b If the wheel and axle radii is increased by 10 mm respectively, find the velocity ratio, mechanical advantage, ideal effort and actual effort.
- How is longitudinal stability achieved in fighter aircrafts like SEPECAT Jaguar?Problem 4 A jet engine shown in Fig. 3-26 is being tested statically on a test stand. The inlet velocity is 500 fps and the exhaust gases leave at a velocity of 3500 fps. The air at the inlet and the exhaust gases at the exit are at atmospheric pressure. The fuel-to-air ratio is 1/50 and the inlet and exhaust areas are both 2 ft. The density of air enter- ing is 0.0024 slugs/ft'. Determine the force Te required to hold the jet engine stationary. Fig. 3-25At a horizontal production line at Danfoss, the boxes of thermostats suddenly make a turn along a circular path of radius 1.1 m. The speed of the boxes is 2 m/s. What is the necessary static coefficient of friction between box and surface to prevent the boxes from sliding off during this circular motion? (2 decimals are sufficient). (Observe: The result is independent of the mass of the boxes!)