Two crates, each of mass 288 kg, are placed as shown in the bed of a 1448-kg pickup truck. Assume g=9.8 m.s² 1.7 m 2.8 m B 1.8 m 1.2 m 0.75 m 2- Determine the reaction at each of the two front wheels in N.
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- An engineer wants to compare the tensile strengths of steel bars that are produced using a conventional method and an experimental method. (The tensile strength of a metal is a measure of its ability to resist tearing when pulled lengthwise.) To do so, the engineer randomly selectoA researcher wonders whether younger mothers have babies that are significantly heavier or lighter than the population average of μ 7.25 pounds. The researcher collects data from N = 35 babies who were born to mothers between the ages of 16 and 18. The average weight for these babies was M = 7.15 pounds (SD = .6 pounds).A student is concerned with the amount of air pollution students are exposed to in the school's parking lot after school. The student conducts an investigation to compare the quantity of particulate matter released from the diesel-powered buses, natural gas-powered buses, and the large and small cars as they idle waiting to pick up students. To make measurements, a small piece of white fabric is used to collect particulate matter from the tailpipe of each vehicle as it idles for five minutes. Each piece of fabric is then analyzed to measure the amount of particulate matter it collected. (i) Identify the independent variable in the investigation. (j) Identify one variable that was not mentioned in the description that could affect the results of the investigation. (k) Describe a realistic alternate sampling method to collect particulate matter from the vehicles in the investigation. (1) The student wants to ensure that the results are reliable. Explain how the student could modify the…
- A manufacturing company produces electric insulators. You define the variable of interest as the strength of the insulators. If the insulators break when in use, a short circuit is likely. To test the strength of the insulators, you carry out destructive testing to determine how much force is required to break the insulators. You measure force by observing how many pounds are applied to the insulator before it breaks. You collect the force data for 30 insulators selected for the experiment and find out that the mean force is 1670. Based on that, you construct an interval from 1570 to 1770 and claim that this interval can be one of the 95% intervals around the sample means that contain the population mean force. This interval is Check all that apply. a statistic a parameter an interval estimate a point estimate a confidence intervalA brand of plant food is made from three chemicals. The mix must include 11.6% of the first chemical, and the other two chemicals must be in a ratio of 3 to 4 as measured by weight. How much of each chemical is required to make 660 kg of the plant food? Assume the given conditions are satisfied. The mix has kg of the first chemical, kg of the second chemical, and (Type integers or decimals rounded to three decimal places as needed.) kg of the third chemical.In 13.9 s, 278 bullets strike and embed themselves in a wall. The bullets strike the wall perpendicularly. Each bullet has a mass of 5 x 10-3 kg and a speed of 977 m/s. (a) What is the average change in momentum per second for the bullets? (b) Determine the average force exerted on the wall. (c) Assuming the bullets are spread out over an area of 3.17 x 104 m² obtain the average pressure they exert on this region of the wall. (a) Number i (b) Number i (c) Number i Units Units Units
- A hand truck is used to move two kegs, each of a mass 32 kg. Assume g=9.8 m.s²² and neglect the weight of the hand truck. a=35 deg. 80 mm 350 mm 500 mm •G2 B 300 mm A P Determine the corresponding reaction at each of the two wheels in N.The specification for the pull strength of a wire that connects an integrated circuit to its frame is 10 g or more. Units made with aluminum wire have a defect rate of 10%. A redesigned manufacturing process, involving the use of gold wire, is being investigated. The goal is to reduce the rate of defects to 5% or less. Out of the first 100 units manufactured with gold wire, only 4 are defective. True or false: a) Since only 4% of the 100 units were defective, we can conclude that the goal has been reached. b) Although the sample percentage is under 5%, this may represent sampling variation, so the goal may not yet be reached. c) There is no use in testing the new process, because no matter what the result is, it could just be due to sampling variation. d) If we sample a large enough number of units, and if the percentage of defective units is far enough below 5%, then it is reasonable to conclude that the goal has been reached.A consumer agency is investigating the blowout pressures of Soap Stone tires. A Soap Stone tire is said to blow out when it separates from the wheel rim due to impact forces usually caused by hitting a rock or a pothole in the road. A random sample of 28 Soap Stone tires were inflated to the recommended pressure, and then forces measured in foot-pounds were applied to each tire (1 foot-pound is the force of 1 pound dropped from a height of 1 foot). The customer complaint is that some Soap Stone tires blow out under small-impact forces, while other tires seem to be well made and don't have this fault. For the 28 test tires, the sample standard deviation of blowout forces was 1358 foot-pounds. Soap Stone claims its tires will blow out at an average pressure of 24,000 foot-pounds, with a standard deviation of 1020 foot-pounds. The average blowout force is not in question, but the variability of blowout forces is in question. Using a 0.01 level of significance, test the claim that the…
- An article includes the accompanying data on compression strength (lb) for a sample of 12-oz aluminum cans filled with strawberry drink and another sample filled with cola. Sample Sample Size Mean 15 15 Beverage Strawberry Drink Cola 0.05.) Does the data suggest that the extra carbonation of cola results in a higher average compression strength? Base your answer on a P-value. (Use a = USE SALT но: H1 - H2=0 Ha: H1 -H2 0 Sample SD 22 15 P-value = H₂ for the cola.) Calculate the test statistic and determine the P-value. (Round your test statistic to one decimal place and your P-value to three decimal places.)A metal sphere weighing 24 kg is melted down and recast into a solid cone of base radius 8.0 cm. If the density of the metal is 8000 kg/m3 determine (a) the diameter of the metal sphere and (b) the perpendicular height of the cone, assuming that 15% of the metal is lost in the process. (Ans. a. 17.9 cm b. 38.0 cm)Need help asap!! Thanks!