Ace - AI Tutor
Ask Our Educators
Textbooks
My Library
Flashcards
Scribe - AI Notes
Notes & Exams
Download App
carolyn spencer

carolyn s.

Divider

Questions asked

BEST MATCH

Question 7 of 20: Select the best answer for the question. 7. Of the following, who do we consider to be the father of computer-assisted instruction? A. Seymour Papert B. John Kemeny C. Patrick Suppes D. Arthur Luehrmann

View Answer
divider
BEST MATCH

Does antimatter have negative mass, causing it to be repelled by the gravity of stars?

View Answer
divider
BEST MATCH

is the nutritional assessment that takes different measurements to assess growth and body composition. (A) Anthropometry (B) Clinical Methods C) Biochemical Methods D) Dietary Methods

View Answer
divider
BEST MATCH

Caleb, a math tutor, thinks he has the ability to predict the outcome of rolling a fair die. You think he's crazy, so you agree to pay him $4 if he can correctly predict the results of the next roll. Caleb will have to pay you $2 if he is wrong. Interpret the expected value in the context of the problem.

View Answer
divider
BEST MATCH

Texts: Did I complete this correctly? Task: Design an experiment to assess the following hypothesis: Hypothesis: 2023 Auburn Community College students who use cell phones during a class will perform more poorly on their final exam than Auburn Community College students who do not use cell phones during a class. • In your description of your research, be sure to identify: - Who you will use in your study - How you will randomly select them - How many subjects you will use - How you will randomly assign them into groups (2 points) Research Question: If you use your cell phone during class, will you perform poorly on the final exam as opposed to if you did not use your cell phone during class? Hypothesis: 2023 Auburn Community College students who use cell phones during a class will perform poorer on their final exam than Auburn Community College students who do not use cell phones during a class. Population and Sample: Population: The population consists of all 2023 Auburn Community College students aged 17-50 who own cell phones. Sample: I will randomly select 50 participants from this population to participate in the study. Experimental Design: I will randomly select 50 participants from the pool of classmates aged 17-50 who have cell phones. Random assignment will be done to put participants into two different groups: Experimental group and control group. • In your description of your research, be sure to identify: - What you will have your experiment and control groups do (1 point) Experimental group: Participants in this group will have cell phones and use them during class. Control group: Participants in this group will not have cell phones in class during class. • How you will operationally define your IV and your DV (1 point) Independent variable: The independent variable is using cell phones during class. Dependent variable: The dependent variable assesses the participants of both groups on their performance on the final exam. • Who your population and your sample are (.5 points) Population: The population is the students from Auburn Community College. Sample: The sample consists of the 50 participants from this population for the study. • What results would support your hypothesis (.5 points) Expected results would support or show that the experimental group, those who used their cell phones during class, will exhibit poorer grades on their final when compared to the control group who did not use their phones during class.

View Answer
divider
BEST MATCH

Q6. A steel pipe carrying steam has an outside diameter of 89 mm. It is lagged with 76 mm of insulation having an average k = 0.043 W/m.K. Two thermocouples, one located at the interface between the pipe wall and the insulation and the other at the outer surface of the insulation, give temperatures of 115°C and 32°C, respectively. Calculate the heat loss in W per m of pipe. Q7. A metal steam pipe having an outside diameter of 30 mm has a surface temperature of 400 K and is to be insulated with an insulation having a thickness of 20 mm and a k of 0.08 W/m · K. The pipe is exposed to air at 300 K and a convection film coefficient of 30 W/m² · K. a) Calculate the critical radius and the heat loss per m of length for the bare pipe. b) Calculate the heat loss for the insulated pipe assuming that the surface temperature of the pipe remains constant. Q8. A reaction mixture having a Cpm = 2.85 kJ/kg.K is flowing at a rate of 7 260 kg/h and is to be cooled from 377.6 K to 344.3 K. Cooling water at 288.8 K is available and the flow rate is 4 536 kg/h. The overall heat transfer coefficient Uo is 653 W/m²K. a) For counterflow, calculate the outlet water temperature and the area Ao of the exchanger. b) Repeat calculations for cocurrent flow. Q9. Oil flowing at the rate of 7 258 kg/h with a Cpm = 2.01 kJ/kg · K is cooled from 394.3 K to 338.9 K in a countercurrent flow heat exchanger by water entering at 294.3 K and leaving at 305.4 K. Calculate the flow rate of the water and the overall heat transfer coefficient Ui if the Ai is 5.11 m². Q10. Water flowing at the rate of 13.85 kg/s is to be heated from 54.5 to 87.8°C in a heat exchanger by 54 430 kg/h of hot gas flowing countercurrent flow and entering at 427°C (Cpm = 1.005 kJ/kg · K). The overall heat transfer coefficient Uo = 69.1 W/m²K. Calculate the exit-gas temperature and the heat-transfer area. Q11. A plane wall is constructed of a material having a thermal conductivity that varies as the square of the temperature according to the relation k = k0(1 + ?T²). Derive an expression for the heat transfer in such a wall (k0 and ? are constants).

View Answer
divider
BEST MATCH

4.3-8. (a) Find a constant $b$ (in terms of $a$) so that the function $f_{x,y}(x, y) = \begin{cases} be^{-(x+y)} & 0 < x < a \text{ and } 0 < y < \infty \\ 0 & \text{elsewhere} \end{cases}$ is a valid joint density function. (b) Find an expression for the joint distribution function.

View Answer
divider
BEST MATCH

In a very long p-type Si bar with cross-sectional area = 0.5 cm^2 and N = 3x10^16/cm^3, we inject holes such that the steady state excess hole concentration is 7x10^16/cm^3 at x = 0. What is the steady state separation between F and E at x = 150 nm? What is the hole current there? μ = 500 cm^2/Vs and τ = 10^-10 s.

View Answer
divider
BEST MATCH

In a layered shell composite analysis, the stress for each ply is calculated directly from the strain of the shell element. Select one: True False For a basic 2D (plane stress) composite analysis in FEA, how many material stiffness constants are required? Select one: a. 4 b. 2 c. 9 d. 1 e. 6

View Answer
divider
BEST MATCH

QUESTION 1 Which of the following are classified as cash flows from financing activities under US GAAP? Select ALL appropriate responses below. Receipt of dividend Payment of interest Repurchase of Common Stock Issuance of Bonds

View Answer
divider