A steel rod 20 mm in diameter and 120 mm long is joined to the end of a copper rod 20 mm in diameter and 80 mm long, thus forming a composite rod of 200 mm in length. If the ends of the composite rod are now clamped, calculate the stress set up in the steel and copper due to a temperature increase.
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- The solid homogeneous cylinder is released from rest on the ramp. Determine the magnitudes of the acceleration of the mass center G and the friction force exerted by the ramp on the cylinder. Assume r = 6.0 in., W = 8.2 lb, 0 = 38°, μs = 0.28, μk = 0.18. Answers: W AG= i F = Ак ft/sec² i lbA part at Belleh Fontem Manufacturing requiresholes of size .5 ± 0.0 I inches. The drill bit has a s tated size of.5 ± 0.005 inches and wears at the rate of .00017 inches perhole drilled. Give the most and least number of holes that can bedrilled with one drill bit before it has to be replaced.A bar of 12 mm diameter gets stretched by 3 mm under a steady load of 8 kN. What stress would be produced in the bar by a weight of 800 N, which falls through 80 mm before commencing the stretch-ing of the rod, which is initially unstressed. Take E = 200 kN/mm2.
- A trucking firm is considering the installation of a new, low-restriction engine air filter for its long-haul trucks, but doesn’t want to make the switch unless the new filter can be shown to improve the fuel economy of these vehicles. A test is set up in which each of 10 trucks makes the same run twice once with the old filtration system and once with the new version. Given the sample results shown below: Truck Number Current Filter (mpg) New Filter (mpg) 1 7.6 7.3 2 4.1 7.2 3 10.4 6.8 4 6.9 10.6 5 5.6 8.8 6 7.9 8.7 7 5.4 5.7 8 5.7 8.7 9 5.5 8.9 10 5.3 7.1 If the null and alternative hypotheses can be used to decide whether the new filtration system could be superior. Calculate the standardized test statistic. A. t_statistic = -21.2196 B. t_statistic = 21.2196 C. t_statistic = -2.1219 D. t_statistic = -2.1220A wheel tractor-scraper is carrying a 50,000 lb load while operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to overcome an equivalent rolling resistance of 12%? For the fully loaded condition 40% of the weight is distributed to the drive axle. Operating weight of the scraper when empty is 70,000 lb.6.4 (5 pts) A wheel tractor-scraper is carrying a 50,000 lb load while operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to overcome an equivalent rolling resistance of 12%? For the fully loaded condition 40% of the weight is distributed to the drive axle. Operating weight of the scraper when empty is 70,000 lb.John Bruno owns a factory producing electric cords. John observes that recently the number of cords with defect has increased. He monitors the 3 processing machines for 30 days for 100 cords per observation per machine. The results of John Bruno’s observations are presented in the table below.What can he do to make sure that the number of cords with defect to go down? Date Number of Rejects by Cause Number of observations Machine Bad Wind Twisted cord Broken Leads Abraded cord Broken cord Wrong wire Failed Electrical Test 1 100 1 0 1 3 1 0 0 1 100 2 2 1 0 0 2 5 0 100 3 0 0 0 5 0 0 3 2 100 1 1 0 4 0 0 0 0 100 2 3 1 0 0 1 3 0 100 3 0 0 1 6 0 0 0 3 100 1 1 0 0 2 0 0 0 100 2 0 0 0 0 0 3 0 100 3 0 0 1 4 0 0 3 4 100 1 0 0 3 0 0 0 0 100 2 0…
- You are the Green Belt Industrial Engineer in charge of manufacturing process for batteries that have an average voltage output of 12 volts, with production assumed to be normally distributed. You have decided that if a sample of 21 batteries taken from production has a sample average of 11 and sample standard deviation of 1.23, then the production is declared out of control and the line is stopped What is the confidence that your decision is a proper one to take?a factory that produces a small number of items per day. In about 30% of working days the factory produces 7 units of the product, in 45% of working days it produces 8 units, and the rest of working days it produces 9 units. After production is completed, each unit is thoroughly inspected. Each unit fails inspection with probability ??. If two or more units fail inspection on the same day, the factory closes for a week to re-calibrate equipment. Say the factory opens today after being closed for a week, write a mathematical expression to calculate the probability that the factory will remain open at least 30 days before closing again.In a manufacturing process, 10% of the produced units are defective. If the process produces 1000 units per hour, how many defective units are produced in a day (8 hours of operation)?
- Output from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 20 units per hour, is paid $8 per hour, including fringe benefits. Should an inspection station be established to test all units? Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. a-1. Without the inspector, what is the current hourly cost of defects? a-2. Should an inspection station be established to test all units based on costs alone? multiple choice Yes No a-3. If the inspection operation is added, what would be the cost to inspect each unit? Note: Round your answer to 2 decimal places. b. What would be the benefit (or loss) from establishing the inspection process? Note: Round your answer…Meena Chavan Corp.’s computer chip productionprocess yields DRAM chips with an average life of 1,800 hoursand s = 100 hours. The tolerance upper and lower specification limits are 2,400 hours and 1,600 hours, respectively. Is this pro-cess capable of producing DRAM chips to specification?Meena Chavan Corp.’s computer chip production process yields DRAM chips with an average life of 1,800hours and s = 100 hours. The tolerance upper and lowerspecification limits are 2,400 hours and 1,600 hours, respectively. Is this process capable of producing DRAM chips tospecification?