Ask an Expert (Page 43)

Connecting solar cell, motor and supercapacitor

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

Connecting solar cell, motor and supercapacitor Connecting solar cell, motor and supercapacitor Hello, have been working on project "The Speed of Light: Explore Solar Energy with a Supercapacitor Car Motor." The instructions in the Science Wiz Energy Kit differ a little from the instructions on the website. The motor won't run. In the picture on the website, the red wire from the solar cell and positive side from the supercapacitor are on the left side of the motor. In the kit, its on the… Read more

Predicting Future Water Quality with Machine Learning

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

Predicting Future Water Quality with Machine Learning Predicting Future Water Quality with Machine Learning Hi there! I am currently doing a project that utilizes decision trees and random forests, and I had a quick question. Can decision trees and random forests be used in iOS apps or apps in general? An example would be if the two types of machine learning were able to predict future water quality and their predictions were then displayed in an app. If so, how might it be accomplished?… Read more

Which Filtration Material Leads to the Best Drinking Water?

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

Which Filtration Material Leads to the Best Drinking Water? Which Filtration Material Leads to the Best Drinking Water? Hello, my child has conducted the experiment “Which Filtration Material Leads to the Best Drinking Water?” on this site however no change was observed between the variables filtering out the ink (granulated activated charcoal and powdered activated charcoal). All were still very dark in color afterwards and didn’t appear to filter out the ink. Did we do something incorrectly… Read more

Clinostat - Continuous rotation servo motors burning out

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

Clinostat - Continuous rotation servo motors burning out Clinostat - Continuous rotation servo motors burning out Doing a project closely based on this post: https://www.sciencebuddies.org/science-fair-projects/project-ideas/PlantBio_p054/plant-biology/plants-grow-microgravity-arduino-clinostat As we are in Canada, we didn't buy the kit associated with it, but built our own, using these motors Wishiot Feetech 9g FS90R Mini Micro Servo 360 Degree Continuous Rotation Servo Motor (sold here:… Read more

3.3V mini solar tracking system coding problem

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

3.3V mini solar tracking system coding problem 3.3V mini solar tracking system coding problem Hi Folks first time here and this will be an easy question. but my Gr 8 daughter nor I can rewrite one line of code. We are trying to change the code in the tutorial video from : analog read pin P1 TO: set voltage to 3.3 × analog read pin P1 / 1023 We are unfamiliar with how to manipulate the code blocks such that we get: set voltage to 3.3 × analog read pin (0 / 1023) the division formula in… Read more

Thyroid Cancer Recurrence: error message

Ask an Expert Topic Forum: Grades 9-12: Math and Computer Science

Thyroid Cancer Recurrence: error message Thyroid Cancer Recurrence: error message Hey, I'm not sure if this is a problem with the code or an external issue, but whenever I run any code block, I get an error message saying either "ModuleNotFoundError" or "NameError". I attached a screenshot, if you could help. Re: Thyroid Cancer Recurrence: error message You need to make sure you run all the blocks (in order). Go back and start from the beginning and make sure that each one executes… Read more

Question on Dealing with Diabetes: The Road to Developing an Artificial Pancreas

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

Question on Dealing with Diabetes: The Road to Developing an Artificial Pancreas Question on Dealing with Diabetes: The Road to Developing an Artificial Pancreas I’m just wondering if I could use purified water such as bottled water instead of distilled. Would it have any detrimental effects if I did so? Thank you. Re: Question on Dealing with Diabetes: The Road to Developing an Artificial Pancreas Hi - "purified" bottled drinking water can still have minerals and other contaminants that… Read more

Struggling with “How old is the Universe.”

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

Struggling with “How old is the Universe.” Struggling with “How old is the Universe.” I’m having a tough time understanding the chart with all of the numbers on it. Do I have to subtract the g-r for all 300+ stars? Moderator suggestion: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Astro_p042/astronomy/how-old-is-the-universe Re: Struggling with “How old is the Universe.” Hello, So I think what you are confused about is the 2nd step of the 'Make a H-R Diagram'… Read more

Robot Arm Project

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

Robot Arm Project Robot Arm Project Hello, I am currently working on a project known as, "Build a Robotic Arm" and I am stuck on the coding section. I used the figure 7 example for the wiring and downloaded the example code to a new sketch in the arduino website. However, when i verify the code there are always errors with it. Am I doing something wrong? If so, is there any way i can fix it. Thank you. [admin note: project url:… Read more

Adaptive Switch Project

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

Adaptive Switch Project Adaptive Switch Project We have students who would like to build an adaptive switch. Where can we find the full instructions? This is a project that has an asterisk in the title. Re: Adaptive Switch Project Hi, Projects with an asterisk in the title are "abbreviated" ideas that do not have full instructions. However, if your student wants to use a micro:bit, then this project is extremely similar and they could use the same code. They can change the mechanical… Read more

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