Summarizes the Inventory of Switches 1-20 Answer Key

Question 1 1 / 1 pts The spreadsheet shown summarizes the inventory of switches in VEX kits in the ENGR 10 lab. Which of the equations below would be an INCORRECT equation in cell B8 to determine the total number of limit switches? Correct! =COUNT(B2:B6) Question 2 1 / 1 pts An inventory of parts in the ENGR 10 lab is shown in the figure. To calculate the total number of parts in the inventory what equation would you wirte in cell B8? Correct! =sum(b2:b7) Question 3 What answer will appear for the equation in cell C2? 1 / 1 pts Correct! 4 Question 4 1 / 1 pts You have plotted the "column" graph that shows enrollment trends. Your boss tells you she is not happy with the legend. How should you fix it? Correct! Change the word "Series 1" to 2003 and the word "Series 2" to 2010 Question 5 1 / 1 pts The plot contains data from a load deflection test. Three types of fits have been made to the data: linear, power, and log-linear. Why would you choose a particular trendline as the best fit? Correct! Both A and B Question 6 1 / 1 pts Complete the following equivalency 1 calorie = Correct! 4.184 joules Question 7 1 / 1 pts A Joule equals Correct! N-m Question 8 1 / 1 pts A kilowatt-hour is a unit of power. Correct! False Question 9 1 / 1 pts A student weighs 140 lb. This student is able to run up to the 3rd floor in 20 seconds. The 3rd floor is 10 meters above the ground floor. Which of the following values is closest to the average power this student exerted in climbing the stairs? Correct! 310 W Question 10 1 / 1 pts Which of the following heaters can heat up a gallon of water from 10 oC to 100 oC faster? Correct! 100 W heater Question 11 Which of the following heaters can heat up a gallon of water from 10 oC to 50 oC? Correct! All heaters listed will heat the water from 10o C to 50o C. 1 / 1 pts Question 12 1 / 1 pts When you combine P-type and N-type silicon in a solar cell, what happens? (image from www.solarpath.org) Correct! Electrons at the N-P junction eventually form a barrier in the form of an electric field. Question 13 1 / 1 pts There are 2 solar cells. Each one is capable of outputting 1 volt voltage and 2 Amp current. To obtain output of 4 Amp, how should these two cells be connected and what is the voltage? Correct! 2 cells in parallel, voltage = 1V Question 14 1 / 1 pts Which of the following factors affect the performance of a solar cell? Choose as many answers as you think are correct. Correct! The surface condition of solar cells (cleanness) Correct! The intensity of the light Correct! The angle of incident light Correct! The wavelength of the light Question 15 1 / 1 pts A student lifts a weight (W) using a motor powered by solar cells to determine the efficiency of the solar cell/motor system. On the power meter the volage reads V and the current reads I. The student lifts the weight a distance H in a time T. What is the output power of this system? Correct! W*H/T Question 16 1 / 1 pts A current of 4 Amps is flowing through a 2Ω resistor. How much power is dissipated by the resistor? Correct! 32W Question 17 1 / 1 pts The voltage across the power source in the circuit shown is V= 15 volts. What is the unknown current I? Correct! 15 amps Question 18 1 / 1 pts The current in the circuit shown is I= 2 Amps. What is the voltage across the power source? Correct! 20 V Question 19 1 / 1 pts Wind turbine B has blades twice as long as wind turbine A. If they are subjected to the same wind, what is the relationship between the power from turbine A (P A) and the power from turbine B (P B)? Correct! 4 PA = PB Question 20 1 / 1 pts Select as many answers as you think are correct. Hint: Look at the PowerPoint from the lecture. The angle of attack ... Correct! Correct! affects the efficiency of the wind turbine. typically has values between 1 degree and 15 degrees for wind turbines.