Ask an Expert (Page 37)

How Easily Can Your Password Be Hacked method not working

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

How Easily Can Your Password Be Hacked method not working How Easily Can Your Password Be Hacked method not working I'm doing the "How Easily Can Your Password Be Hacked?" project for a science fair but I encountered an error when running the program. When asking the program to guess password 0 it uses method 3 first and it works perfectly fine. But when going on to use method 4 the program just stops. It says "Using method 4 with 26 punctuation characters and 30000 words..." and nothing… Read more

Replacement source - Cobalt Nitrate Hexahydrate

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

Replacement source - Cobalt Nitrate Hexahydrate Replacement source - Cobalt Nitrate Hexahydrate Posted on behalf of family --------------------------------------------- My son would like to run this experiment for his science fair project. We are unable to find the chemical Cobalt Nitrate Hexahydrate. The link to Amazon says it no longer has product. Can you offer a substitute or other place to purchase? Water to Fuel to Water: The Fuel Cycle of the Future | Science… Read more

Artificial Pancreas Arduino Questions (pump)

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

Artificial Pancreas Arduino Questions (pump) Artificial Pancreas Arduino Questions (pump) Posted on behalf of student/family ----------------------------------------------------------- i was wondering what external power supply do i need to use a 12V pump instead of a 5V pump, do u mean like a battery or smt? I just more details on how to use the 12V specifically. Firstly, for the Audino Uno kit do I have to buy [the kit linked in the project] in order for the code to work? Also, for… Read more

Obstacle-Detecting Walking Stick

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

Obstacle-Detecting Walking Stick Obstacle-Detecting Walking Stick Posted on behalf of student/family ------------------------------------------------- We need your support in finalising our project. We have ordered kit for the project as given below. Build an Obstacle-Detecting Walking Stick for Blind People. We have fixed all items as per video & uploaded the code but it is not beeping. Photos: [attachment=3]image3.jpg[/attachment] [attachment=2]image1… Read more

Testing the antimicrobial properties of metals

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

Testing the antimicrobial properties of metals Testing the antimicrobial properties of metals Hello, I am performing a science experiment testing the antibacterial properties of certain metals - those being copper, silver, and zinc. I have come up with a procedure but am unsure if it is flawed or if I am forgetting a step. My procedure involves using the kirby-bauer disc diffusion test and measuring the inhibition zone of the bacteria to determine antibacterial properties. I will be using… Read more

Question about controlling variables in experiment

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

Question about controlling variables in experiment Question about controlling variables in experiment Hi, I am considering doing a project on runoff of harmful materials (such as cow dung) into rivers and streams. Specifically, the effectiveness of different plants in absorbing/preventing it reaching the water in the first place. My vague plan for this so far would be a large box on a slight lean, separated into 3 compartments that allow liquid to travel through them. Compartment 1 to pour… Read more

Obstacle Detecting Glasses

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

Obstacle Detecting Glasses Obstacle Detecting Glasses Posted on behalf of student --------------------------------------- Hello, can I ask how I would be able to make an obstacle warning sensor glasses that has 3 sensors in total (one for the front, left, and right side)? I've been looking for tutorials on how to make this sort of stuff ... mostly (I have found) glasses that had 1 ultrasonic sensor instead of 3. I have a consultation tomorrow and I know you might not be able to see this… Read more

Model Mass Driver

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

Model Mass Driver Model Mass Driver Posted on behalf of student ---------------------------------------- I have been trying to follow one of the tutorials on your website for making a model mass driver: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p094/electricity-electronics/arduino-mass-driver#abstract. I have been having an issue with having the current actually run through the coil. I have done some troubleshooting, such as directly connecting the coil to the… Read more

Testing Multivitamins (Titration)

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

Testing Multivitamins (Titration) Testing Multivitamins (Titration) Posted on behalf of family/student --------------------------------- We got the Orange Juice Titration kit for my daughter’s science fair project and she was attempting to use it for testing of vitamin C in multi vitamins. The idea was to confirm the milligrams on the label to actuals since they’re not regulated by the FDA. One test on a tablet worked with a color change, but two of the ones she used were capsules and… Read more

How Much Weight is needed to break a concrete brick

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

How Much Weight is needed to break a concrete brick How Much Weight is needed to break a concrete brick We are doing the experiment where you mix different ratios of Portland cement, sand and water. I made a standard sized brick and we make a bracket to hang weights from the center of the brick to test how much weight is needed to break the brick. The one brick I got up to 225 lbs. hanging from it and it still did not break. I ran out of weights and a place to put the… Read more

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