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- The rocket in vertical flight is being tracked by radar.At an instant, the radar readings are:25000 bolts are going to be used to fix a certain structure. The bolts have a mean fatigue life of 10000 days with a standard deviation of 2000 days under heavy dynamic loading conditions.What is the probability that a bolt will fail between 8250 and 12500 days of use?1. In general, what pattern do you notice between the force due to the gravity of the masses and the displacement of the spring? 2. What is the physical meaning of the slope? 3. Using the slope for each spring, what would be the force required to stretch the spring 0.10 m? 4. Using the slope for each spring, what would be the amount of stretch with a 500 g mass hanging on the spring? Ps: pls refer to the graph below
- The mean weight of five complete computer stations is 167.2 pounds. The weights of four of the computer stations are 158.4 pounds, 162.8 pounds, 165.0 pounds, and 178.2 pounds respectively. What is the weight of the fifth computer station?Bolts installed on a production line are tightened with automatic wrenches. They are to be tightened sufficiently to yield the full cross-section in order to produce the highest possible initial tension. The limiting condition is twisting off the bolt head during assembly. The bolts have a mean twisting off torque of 20 Nm with a standard deviation of 1 Nm. The automatic wrenches have a standard deviation of 1.5Nm. What mean value of torque wrench setting would result in only 1 in 500 twisting off during assembly? Give a rough estimate only. A unit has a constant failure rate of 0.3% per 1000 hours. What is its MTBF? What are the probabilities of the unit successfully completing missions of 10000, 100000 and 1000000 hours? Give a rough estimate only.Mechanical Dynamic.
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