Ask an Expert (Page 31)

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

Automatic Watering System: LCD problem when pump is on

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

Automatic Watering System: LCD problem when pump is on Automatic Watering System: LCD problem when pump is on We are trying to build an "Automatic Watering System" using Arduino. We have gone through the videos posted by Science Buddies and combined several different videos to build this. Arduino is connected to moisture sensor, a buzzer (when pump turns on), LEDs (green and red to show pump off/on respectively), and an LCD display to show (mositure level, pump status). Pump is a very small… Read more

Telescope

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

Telescope Telescope What is distance between the object lens and eye lens in the telescope you had given convex lens of focal length 500mm and concave lens of focal length 150mm Re: Telescope Hi - Are you working on a science project? If so, please tell us about your experiment. The experts in the forums are not able to provide homework or test help. Amy Science Buddies Read more

MIT App Inventor

Ask an Expert Topic Forum: Grades 6-8: Math and Computer Science

MIT App Inventor MIT App Inventor What are the requirements for full completion? Re: MIT App Inventor Hi - It isn't clear what project you are asking about or what project you are planning to do with MIT App Inventor. If you can more fully explain the question, someone may be able to assist. Amy Science Buddies Read more

Question about Are You Left or Right Brained? activity

Ask an Expert Topic Forum: Grades 6-8: Life, Earth, and Social Sciences

Question about Are You Left or Right Brained? activity Question about Are You Left or Right Brained? activity Type your question below and then press Submit! How do i do it without so many people ------------------------------------- Leave this to help the Experts: The activity can be viewed at: [url=https://www.sciencebuddies.org/stem-activities/left-right-brain-dominance] Are You Left or Right Brained? [/url] Re: Question about Are You Left or Right Brained? activity Please note that… Read more

Salt water battery

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

Salt water battery Salt water battery PLEASE HELP!!! I did the salt water battery experiment,but i can’t tell whether or not it’s producing the amount of energy that it should be producing! I have restarted the experiment and am getting the same results. Please help,I need answer. I hope this isn’t bother. Re: Salt water battery Hello! This is an interesting issue. I can't exactly help you without any other information. Could you tell me what your setup is so I can help you better? Re:… Read more

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