I am a recent graduate with a B.S in Physics and Astronomy looking to gain further experience in education. During my time in undergrad, I worked as a Research Assistant leading multiple projects focused on the evolution of distant galaxy clusters. My work led me to publish a first-author paper, give multiple presentations at professional conferences, and in the spring of 2020 received an honorable mention from the National Science Foundations Graduate Research Fellowship.
I also participated in a NASA funded program, 'A Bridge to the Stars', which provided full scholarships to local socio-economically disadvantaged high school students to take an introductory astronomy course at my university. I attended class with the 16 students, created practice exams, and led weekly supplemental lectures.
In addition, I worked as a grader for introductory physics classes in Classical Mechanics and Electricity and Magnetism.
In this section we used a two-step procedure to select a simple random sample of 30 EAImanagers. Use this procedure to select a simple random sample of 50 EAI managers.
Towers Perrin, a New York human resources consulting firm, conducted a survey of1100 employees at medium-sized and large companies to determine how dissatisfied employees were with their jobs (The Wall Street Journal, January $29,2003 ).$ Representative data are shown in the file JobSatisfaction. A response of Yes indicates the employee strongly disliked the current work experience.$$\begin{array}{l}{\text { a. What is the point estimate of the proportion of the population of employees who }} \\ {\text { strongly dislike their current work experience? }} \\ {\text { b. At } 95 \% \text { confidence, what is the margin of error? }} \\ {\text { c. What is the } 95 \% \text { confidence interval for the proportion of the population of employees }} \\ {\text { who strongly dislike their current work experience? }}\end{array}$$$$\begin{array}{l}{\text { d. Towers Perrin estimates that it costs employers one-thind of an hourly employee's }} \\ {\text { annual salary to find a successor and as much as } 15 \text { times the ann ual salary to find a }} \\ {\text { successor for a highly compensated employee. What message did this survey send to }} \\ {\text { employers? }}\end{array}$$
A nonuniform, but spherically symmetric, distribution of charge has a charge density $\rho(r)$ given as follows: $$\begin{array}{ll}{\rho(r)=\rho_{0}(1-r / R)} & {\text { for } r \leq R} \\ {\rho(r)=0} & {\text { for } r \geq R}\end{array}$$ where $\rho_{0}=3 Q / \pi R^{3}$ is a positive constant. (a) Show that the total charge contained in the charge distribution is $Q .$ (b) Show that the electric field in the region $r \geqslant R$ is identical to that produced by a point charge $Q$ at $r=0 .$ (c) Obtain an expression for the electric field in the region $r \leq R .$ (d) Graph the electric-field magnitude $E$ as a function of $r .$ (e) Find the value of $r$ at which the electric field is maximum, and find the value of that maximum field.
Running to change time interval of day At present,the motion of people on Earth is fairly random; the numbermoving east equals the number moving west, etc. Assumethat we could get all of Earth’s inhabitants lined up along the land at the equator. If they all started running as fast as possible toward the west, estimate the change in the length of a day. Indicate any assumptions you made.
Tropical flowers Different varieties of the tropical flower Heliconia are fertilized by different species of hummingbirds.Researchers believe that over time, the lengths of the flowers and the forms of the hummingbirds’ beaks have evolved to match each other. Here are data on the lengths in millimeters for random samples of twocolor varieties of the same species of flower on the island of Dominica:$^{32}$$$ \text { H. caribaea red }$$$$\begin{array}{lllllll}{41.90} & {42.01} & {41.93} & {43.09} & {41.17} & {41.69} & {39.78} & {40.57} \\ {39.63} & {42.18} & {40.66} & {37.87} & {39.16} & {37.40} & {38.20} & {38.07} \\ {38.10} & {37.97} & {38.79} & {38.23} & {38.87} & {37.78} & {38.01}\end{array}$$$$ \text { H. caribaea yellow }$$$$\begin{array}{lllllll}{36.78} & {37.02} & {36.52} & {36.11} & {36.03} & {35.45} & {38.13} & {37.1} \\ {35.17} & {36.82} & {36.66} & {35.68} & {36.03} & {34.57} & {34.63}\end{array}$$(a) A Fathom dotplot of the data is shown below. Use the graph to answer these questions:$\bullet$ Are the centers of the two groups similar or different? Explain.$\bullet$ Are the spreads of the two groups similar or different? Explain.(b) Construct and interpret a 95% confidence interval for the difference in the mean lengths of these two varieties of flowers.(c) Does the interval support the researchers’ belief that the two flower varieties have different average lengths? Explain.
Will the acceleration of an object double if one of the forces acting on it doubles?
7. A ball is traveling at a constant speed (v) of 40.0 m/s in a circle with a radius (r) of 6.0 m. (Hint: The circumference C = 2?r)
A. The centripetal acceleration is ZERO a. False b. True
B. The total distance traveled by the ball is:
C. How long in time does it take for the ball complete one circle? D. The displacement traveled by the ball is:
E. The average speed of the ball is:
F. The average velocity of the ball is:
A fireman 50.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 60.0° above the horizontal. If the speed of the stream of water as it leaves the hose is 50.0 m/s, at what height will the stream of water strike on the building?
14. A football is thrown from the quarterback to the running back. When the ball reaches its highest point, which statement is true?
a. Its acceleration is zero but velocity is not zerob. Both acceleration and velocity are zeroc. Its vertical component of the velocity is zero and acceleration is a constant.d. Its velocity is perpendicular to the acceleration.e. None of the statements above is truef. both c and d are trueh. both a and c are true
Please see the attached image.
12.125 (a) the acceleration of B relative to A (b) the tension in cable CD.
66.3. the acceleration of a tram car starting from the rest increase uniformly from 0.6 m/s^2 to 2.7 m/s^2 in 8 seconds. then the car continuous at uniform acceleration for the next 20sec and 11 sec more, is brought to stop with a constant deceleration. Draw the a-t, v-t and s-t.
