Homework Answers
a , b , c all are true.
this means option d is true.
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Q5. For reliability considerations for ball bearings, which of the following are true? a) Reliability (%)...
The diameters of ball bearings made by a machine follow a normal distribution. Ball bearings that...
The diameters of ball bearings made by a machine follow a normal distribution. Ball bearings that are too large or too small are undesirable since they will not work properly. The manager wants to see if the machine is producing ball bearings that are significantly different from .35 inches. To make sure the machine is working properly, we take a random sample of 25 ball bearings and find that the sample mean diameter is .34 inches. Assume the population standard...
3) A machine finished bracket is clamped between rigid plates and subjected to loading as shown. a) Find factor of...
3) A machine finished bracket is clamped between rigid plates and subjected to loading as shown. a) Find factor of safety for fatigue failure. b) Will the part has infinite life? c) If the beam has to last for 10 cycles what modifications will you do to improve performance Assume a reliability factor of 99.9%. Dimensions are given below. Ignore stress concentration due to hole near the beam tip (stresses there are low). b- 1 in d- 0.75 in. D-0.94...
The figure above shows a shaft mounted in bearings A and D and having pulleys at B and C.
The figure above shows a shaft mounted in bearings A and D and having pulleys at B and C. The shaft is 20 mm in diameter and made of AISI 1020 CD steel. The forces shown acting on the pulley surfaces represent the belt tensions. The shaft is concerned with yielding and fatigue failure. [Stress analysis) (1) Draw the free body diagrams and find reaction forces at A and D in the xy and xz planes. (2) Draw the shear force and moment...
answer E,F,G and H please 2. A bar of steel undergoes cyclic loading such that max...
answer E,F,G and H please
2. A bar of steel undergoes cyclic loading such that max = 60 kpsi and Omin = -20 kpsi. For the material, Sut = 80 kpsi, 5y = 65 kpsi,ka = 1.107. ky = 0.858, ke = ka = k, = k, = 1, and f = 0.9. (a) Calculate the alternating stress. (2 points) (b) Calculate the meani median) stress. (2 points) (c) Calculate the fully corrected endurance limit. (6 points) (d) Calculate the...
(c) 4.1 and 23 0.5. Indicate whether the following statements are true or not for 10...
(c) 4.1 and 23 0.5. Indicate whether the following statements are true or not for 10 only (10%) 1. The PCA design method considers the fatigue of concrete caused by the edge stress at mid slab and the erosion of foundation caused by comer deflection a) True b) False 2. Generally, the fatigue analysis controls the design of thinner pavements under lighter traffic, the erosion analysis that of thicker pavements under heavier traffic. a) True b) False 3. For pavements...
The true average diameter of ball bearings of a certain type is supposed to be 0.5...
The true average diameter of ball bearings of a certain type is supposed to be 0.5 in. A one-sample t test will be carried out to see whether this is the case. What conclusion is appropriate in each of the following situations? (a) n = 16, t = 1.59, α = 0.05 Reject the null hypothesis. There is sufficient evidence that the true diameter differs from 0.5 in. Reject the null hypothesis. There is not sufficient evidence that the true...
The true average diameter of ball bearings of a certain type is supposed to be 0.5...
The true average diameter of ball bearings of a certain type is supposed to be 0.5 in. A one-sample t test will be carried out to see whether this is the case. What conclusion is appropriate in each of the following situations? (a) n 15 t 1.66 a 0.05 o Reject the null hypothesis. There is sufficient evidence that the true diameter differs from 0.5 in o Reject the null hypothesis. There is not sufficient evidence that the true diameter...
S The true average diameter of ball bearings of a certain type is supposed to be...
S The true average diameter of ball bearings of a certain type is supposed to be 0.5 in. A one-sample t test will be carried out to see whether this is the case. What conclusion is appropriate in each of the following situations? (a) n =20,t = 1.59, a = 0.05 Reject the null hypothesis. There is sufficient evidence that the true diameter differs from 0.5 in O Reject the null hypothesis. There is not sufficient evidence that the true...
1. Which of the following statements is true about the standard deviation of X¯? A. It...
1. Which of the following statements is true about the standard deviation of X¯? A. It increases as the sample size n increases. B. It decreases as the sample size n increases. C. It changes each time a new sample is drawn. D. It does not change as the sample size n increases. 2. The standard deviation of the sampling distribution for a sample mean depends on the value(s) of A. neither the sample size nor the population standard deviation....
Which of the following statements is true about the standard deviation of X? A. It increases...
Which of the following statements is true about the standard deviation of X? A. It increases as the sample size n increases. B. It decreases as the sample size n increases. C. It changes each time a new sample is draw D. It does not change as the sample size n increases The standard deviation of the sampling distribution for a sample mean depends on the value(s) of A. neither the sample size nor the population standard deviation B. the...
The diameters of ball bearings made by a machine follow a normal distribution. Ball bearings that are too large or too small are undesirable since they will not work properly. The manager wants to see if the machine is producing ball bearings that are significantly different from .35 inches. To make sure the machine is working properly, we take a random sample of 25 ball bearings and find that the sample mean diameter is .34 inches. Assume the population standard...
3) A machine finished bracket is clamped between rigid plates and subjected to loading as shown. a) Find factor of safety for fatigue failure. b) Will the part has infinite life? c) If the beam has to last for 10 cycles what modifications will you do to improve performance Assume a reliability factor of 99.9%. Dimensions are given below. Ignore stress concentration due to hole near the beam tip (stresses there are low). b- 1 in d- 0.75 in. D-0.94...
answer E,F,G and H please
2. A bar of steel undergoes cyclic loading such that max = 60 kpsi and Omin = -20 kpsi. For the material, Sut = 80 kpsi, 5y = 65 kpsi,ka = 1.107. ky = 0.858, ke = ka = k, = k, = 1, and f = 0.9. (a) Calculate the alternating stress. (2 points) (b) Calculate the meani median) stress. (2 points) (c) Calculate the fully corrected endurance limit. (6 points) (d) Calculate the...
(c) 4.1 and 23 0.5. Indicate whether the following statements are true or not for 10 only (10%) 1. The PCA design method considers the fatigue of concrete caused by the edge stress at mid slab and the erosion of foundation caused by comer deflection a) True b) False 2. Generally, the fatigue analysis controls the design of thinner pavements under lighter traffic, the erosion analysis that of thicker pavements under heavier traffic. a) True b) False 3. For pavements...
The true average diameter of ball bearings of a certain type is supposed to be 0.5 in. A one-sample t test will be carried out to see whether this is the case. What conclusion is appropriate in each of the following situations? (a) n 15 t 1.66 a 0.05 o Reject the null hypothesis. There is sufficient evidence that the true diameter differs from 0.5 in o Reject the null hypothesis. There is not sufficient evidence that the true diameter...
S The true average diameter of ball bearings of a certain type is supposed to be 0.5 in. A one-sample t test will be carried out to see whether this is the case. What conclusion is appropriate in each of the following situations? (a) n =20,t = 1.59, a = 0.05 Reject the null hypothesis. There is sufficient evidence that the true diameter differs from 0.5 in O Reject the null hypothesis. There is not sufficient evidence that the true...
Which of the following statements is true about the standard deviation of X? A. It increases as the sample size n increases. B. It decreases as the sample size n increases. C. It changes each time a new sample is draw D. It does not change as the sample size n increases The standard deviation of the sampling distribution for a sample mean depends on the value(s) of A. neither the sample size nor the population standard deviation B. the...
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