What evidence leads astronomers to conclude that most of the Milky Way’s mass consists of a mysterious dark matter?

Which person below created a model of the solar system that put the Sun in the center, but that was not very accurate because he assumed that the orbits of the planets must be perfect circles?

Suppose there exists some input element with an id of my-num. Write the JavaScript code that will grab the value from this element and print the text “Hello World!” however many times is specified within this element. You may assume that the user will always type a valid, positive number into this element.

Which of the following security concepts involves a secret key?

Answer this question in your scratch paper provided by the instructor. Please clearly number this problem in your scratch paper. Leave this question blank and submit your booklet with answers with your name to the instructor. Identify the configuration below and fill in the configuration prefix in the name below. Next draw the enantiomer and fill in the configuration prefix in the name below the enantiomer.  Grading Rubric: 2 points for both configuration prefixes 2 points for correct enantiomer drawing – be sure to clearly show groups in the plane, wedges and dashes. R-amphetamine has been used for effective treatment of nasal congestion and among other neuro conditions. However, the S stereoisomer, methamphetamine, is commonly known as “meth” and illegal without a prescription. It can cause irregular and/or rapid heartbeat, delirium, and psychosis.  amphetamine.jpg

Answer this question in your scratch paper provided by the instructor. Please clearly number this problem in your scratch paper. Leave this question blank and submit your booklet with answers with your name to the instructor. Draw a detailed, stepwise mechanism for the following reaction. Write a detailed, stepwise mechanism for the following reaction. Please show all appropriate arrows and steps in the mechanisms, including, at least one termination step. Write a detailed, stepwise mechanism for the following reaction.jpg

Answer this question in your scratch paper provided by the instructor. Please clearly number this problem in your scratch paper. Leave this question blank and submit your booklet with answers with your name to the instructor. Identify the configuration below and fill in the configuration prefix in the name below. Next draw the enantiomer and fill in the configuration prefix in the name below the enantiomer.  Grading Rubric: 2 points for both configuration prefixes 2 points for correct enantiomer drawing – be sure to clearly show groups in the plane, wedges and dashes. R-amphetamine has been used for effective treatment of nasal congestion and among other neuro conditions. However, the S stereoisomer, methamphetamine, is commonly known as “meth” and illegal without a prescription. It can cause irregular and/or rapid heartbeat, delirium, and psychosis.  amphetamine.jpg

According to Nielsen/Norman, tooltips would most likely help with a system’s…

According to Nielsen/Norman, how many and which type of participants should be recruited for a usability study?

Consider the code below… let x = parseInt(prompt(“Type in an integer”));let y = parseInt(prompt(“Type in another integer”));if (x < y) {  x = y;} else {  y = x;}  Assume the user types in a valid integer for both x and y. What will be the value of x and y after the program is done executing?