Here are the instructions about the lab:

Kinetic and Potential Energy Activity

In this activity you will control the motion of a skateboarder as he makes his way along various ramp systems that you create and control. Graphical analysis of his energy can be displayed as you allow the skateboarder to move. There are many settings available on this simulation that will change the action. For example, you could vary the location and the friction forces to see interesting results. Try all the controls to make changes and try to predict how your changes will effect the energy values.

After you have gained familiarity with the simulation, perform the following:a. Use the initial (Intro) setup – a simple U-shaped ramp – to show the relationship between potential and kinetic energy when friction is absent. You can monitor these values by clicking on the Bar Graph. Draw the setup in your lab notebook. Recreate the graphs for various skater positions. Interpret the meaning of the graphical analysis you see using terms that you have learned in this course. Write down this interpretation in your lab notebook. Answer this question: How do potential energy and kinetic energy change relative to each other in this case?

b. Switch to the friction simulation (set the friction level to the midpoint) to see how the Bar Graph changes. Repeat the experiment above. Again, interpret the meaning of the new graphical analysis in your lab notebook. Do the experiment one last time with the friction set at maximum. Answer these questions: Where does the initial potential energy go? How do the results differ when the friction level is changed?

Here is the website for the virtual lab: https://phet.colorado.edu/sims/html/energy-skate-p…

# Tag: Physics

## practice for the final

I have really important final practice test on Tuesday and I want you to help me with it.

The class is introductory physics 151, it is gonna be 28 Questions 2hr limit.I will need the steps of the answers.

Can you do it?

I’m paying for it 30$ and if u get 25 or more of them correct I’m paying you a high tip.

Waiting for your reply.

## 30 physics equation questions

I will provide you with 30 physics questions covering Electromagnetic Waves, Geometrical Optics,Physical Optics: Interference and Diffraction. The answers will be done by solving an equation. This isn’t a multiple choice assignment. Answers are only needed, not work shown.

## Bernoulli’s Fountain Problem

A fluid is flowing through an underground pipe with a radius of 46.3 mm. The fluid reaches a nozzle that is at ground level and the nozzle has a radius of 8.1 mm. Using the pressure gauge for the underground pipe, determine the speed of the fluid in each section of the pipe and the maximum height reached by the fluid after leaving the nozzle.

** See photos for more information and Pressure number

## Fermi question essay

## 10 undergraduate questions on relativity ***please show work and formulas*** (some multipart) (not crazy difficult)

Hi there! The questions are in the images “hw 1” , “2”, and so on. Relativity may sounds daunting but it’s work for new college students so it should be too hard. Especially for a physics expert like you!

***Please type your final answers in a text document so I can read them easily!***

## Maechanical Advantage question

Imagine that you are attempting to pry up a boulder using a pole as a lever and a small stone

as a fulcrum. State which class of lever this would be and how you can tell. Would you

choose a long pole or a short one for the task? In order to make the easiest possible effort

force, would you place the small stone close to the boulder or farther away from the boulder

–

explain your answer using mechanical advantage.

## Physics open ended question

Problem DescriptionA 1,000-kg car is stopped at a stoplight when a 1,800-kg SUV hits it from behind. The two cars lock together and slide to a stop. The debris and skid marks left by the cars indicate that the two cars slid a distance of 3.5 meters before stopping. The coefficient of kinetic friction between rubber tires and a dry road is reported to be 0.7. The driver of the SUV claims he was driving below the 25 mph (11.2 m/s) speed limit before the crash. Is his claim consistent with the evidence gathered at the scene?

Instructions: In a neat and organized fashion, write out a solution that includes the following:

1) A sketch of the physical situation with all given physical quantities clearly labeled. All important states and moments in time should be represented in your sketch (i.e. draw a sketch for each moment in time you are analyzing).

2) An energy bar chart and momentum bar chart that represent this phenomenon. These bar charts should compare two moments in time for systems of your choosing which will help you answer the question.

3) All of the details of the procedure you came up with to reach your answer. If this procedure includes mathematical expressions, you must start from general equations learned in class. Equations should be consistent with physics representations.

4) A complete explanation of your work, explaining not just what you are doing but why you did it did and how you knew to do it. (This part is very important as you need to show me that you understand what you are doing, mention what you did and why you did it for each step you make)

5) An evaluation of all parts of your solution (This part should include four things: 1. mention why the magnitude is reasonable. 2. mention why the sign is positive or negative. 3. mention the units. 4. check consistency and show me how the answer is constant with the bar charts or the force diagram.

Failure to show everything I mentioned will result in points being deducted.

## presentation and powerpoint

famous physicists and develop a 10-minute presentation detailing their career and what you believe to be their greatest contribution(s) to their field in physics. Content must include the following:

A field within physics (ex: Edison did electromagnetism)

Early life—a place of birth, any education, how they got involved in science

Greatest accomplishment and how it advanced their field

Ways in which their discoveries and inventions improved their world

Any controversy surrounding their accomplishments (Edison vs Westinghouse, Newton vs Church)

Final events

Works cited. This is important. If you do research, you must cite the works from which you took the information. It is not important which citing style you use, but make sure you give credit. Also, copying entire paragraphs from an article or a book is considered plagiarism. You are supposed to draw inspiration from other sources, but the presentation should be your own work.

i pick Archimedes Mathematician, physicist, engineer, inventor, and astronomer. Generally considered the greatest mathematician of antiquity and one of the greatest of all time, he anticipated modern calculus and analysis by applying concepts of infinitesimals and the method of exhaustion to derive and rigorously prove a range of geometrical theorems, including the area of a circle, the surface area and volume of a sphere, and the area under a parabola. He also derived an accurate approximation of pi and a system using exponentiation for expressing very large numbers. He was one of the first to apply mathematics to physical phenomena, founding hydrostatics and statics, including an explanation of the principle of the lever.

## 5 short physics questions

Covered:

Electric charges, Electric currents, Conductors, insulators, and semi-conductor, Ohm’s law, Series and parallel circuits, Electric power, Photoelectric effect (quantum mechanics), Specific and latent heat, Kinematic equations for straight line motion, Projectile motion

need people who free at 9:30 am in Sydney time (7 December)