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Ask an Expert Topic Forum: Grades 9-12: Physical Science

Question on 3-D Clinostat Experiment Question on 3-D Clinostat Experiment I created the 3-D clinostat using my arduino kit but the potentiometer does not seem to function properly. Is there any way I can alter the code and apparatus to remove the potentiometer, since this seems to be my main issue? I am also have issues with the code to decrease the rpm. Could I receive guidance on how to resolve these two main issues? [Administrator note: Project url:… Read more

Hello Lead levels in soil

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Hello Lead levels in soil Hello Lead levels in soil Hello, I am working on lead soil levels for my project. What is the safe lead level for experimentation purposes? I looked up ISEF rules and am not sure I found the answer. Can I use 500 ppm in the soil? Is this allowed per ISEF standards for a student to work on? Re: Hello Lead levels in soil We would recommend checking with ISEF regulations and, if you can't find a definitive answers, reaching out to contacts listed on their site so that… Read more

Physics

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Physics Physics If we see the following images In the first image, the centre dot represents a massive thing for example the event horizon of a black hole. Suppose parallel rays of light are coming from the -X direction.Now I have drawn the path followed by each ray (geodesic). A deflection is seen due to curvature of space time fabric [here only a 2d space analog is shown]. How can I imagine the curvature of space time from this diagram. I tried to do the same on the right side and… Read more

How much fizz is in pop

Ask an Expert Topic Forum: Grades 6-8: Physical Science

How much fizz is in pop How much fizz is in pop Hello, I am doing a Grade 6 science project and we have chosen the question, how much fizz is in soda/pop. We are a bit stumped on which direction we should take since there are many different variables. Help narrowing it down would be great! We thought of doing, which pop had more fizz (and thought of adding/changing it to- how long does fizz last), in 2 different flavors of soda. We are not sure how to test this. We thought of measuring how… Read more

Relativity

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Relativity Relativity If someone is traveling to the Andromeda Galaxy at near-light speed and we are video calling them from Earth, how would they appear to us, and how would we appear to them? Would their movements seem slow to us, and would our movements seem fast to them? Since the video signal itself is also affected by relativity, how would that impact what each side sees in real time? Re: Relativity Hello! This is a really interesting question. If someone were traveling to the… Read more

Help! Arduino Obstacle Avoiding Glasses

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Help! Arduino Obstacle Avoiding Glasses Help! Arduino Obstacle Avoiding Glasses Hello, My group is working on this project for our science expo. We have made the circuit exactly as shown in the diagrams, and uploaded the example code to the Uno R4 Minima successfully. But the device does not work; the speaker makes a constant low volume beep every second or so, doesn't matter if anything is placed in front of the ultrasonic sensor or not. Is part of our hardware broken? Using different… Read more

How much fat is in your food?

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

How much fat is in your food? How much fat is in your food? Hey! I'm doing the "How much fat is in your food?" project and I dind't understand very well how to find the extraction efficiency and how correctly interpret the result of that... Re: How much fat is in your food? Hello Switithe, "How much fat is in your food?" is a great project! To find the extraction efficiency, you first need to find the extracted fat percentage by dividing the difference in mass by the original mass and… Read more

Question about Make an Alka-Seltzer Powered Lava Lamp activity

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Question about Make an Alka-Seltzer Powered Lava Lamp activity Question about Make an Alka-Seltzer Powered Lava Lamp activity are the bubbles in a lava lamp important Re: Question about Make an Alka-Seltzer Powered Lava Lamp activity Hello Jaseboomsma, Making a lava lamp using Alka-Seltzer is an awesome project! Yes, the bubbles in the lava lamp are pretty important as they create the signature lava lamp effect. The bubbles in the lava lamp are formed by the Alka-Seltzer tablet reacting to… Read more

Could the clinostat experiment work with beans?

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Could the clinostat experiment work with beans? Could the clinostat experiment work with beans? Hello, I really want to make this clinostat experiment (https://www.sciencebuddies.org/science-fair-projects/project-ideas/PlantBio_p054/plant-biology/plants-grow-microgravity-arduino-clinostat). But I don't have the seeds mentioned. Is it possible that I could do this with beans? Thank you! Re: Could the clinostat experiment work with beans? Hello! Yes, you can definitely use beans for this… Read more

Propeller Cars

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Propeller Cars Propeller Cars Posted on behalf of educator --------------------------------- I wanted to try this project with my class, I can't get the car to move, it seems the battery pack is to heavy for the propeller- any suggestions? we went with the battery pack with the switch option and the only other change was the propeller's link says no longer available, and I couldn't find any other 4 blade fans, used these 3 blade fans, for the 1mm shaft part seemed to be a ill-fitted… Read more

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