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Forum: Grades 9-12: Physical Science
Help!! How do you increase total harmonic distortion?
Help!! How do you increase total harmonic distortion?
Hi, I'm investigating the relationship between total harmonic distortion (THD) of an alternating current and power output in my physics project. I'm planning on using a multimeter to measure current frequency and then calculating THD using the equation THD=[√(I²-I₁²)]/I₁, where I₁ is the RMS of the fundamental wave. I have never done a practical using alternating current before (maybe…
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Forum: Grades 6-8: Physical Science
please help me
please help me
what mosfet and diode did you use on your Motion-Activated Guard Robot (BlueBot Project #1) please help me its for my project in school
Re: please help me
Hi, here are the parts we use, but Jameco has a $20 minimum order otherwise they charge you extra for…
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Forum: Grades 9-12: Life, Earth, and Social Sciences
Microbiology
Microbiology
I am currently doing a science project where I test to see if dental chews help reduce oral bacteria species in a dogs mouth. With this I am going to swab a dogs mouth before and after given a dental chew. What is the best way to count bacteria without growing it? Can I make a bacterial suspension and place in hemocytometer? What is the best way to do this?
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Forum: Grades 9-12: Life, Earth, and Social Sciences
Help! I need help for this explanation!
Help! I need help for this explanation!
Put the following in order of increasing vapour pressure and justify why: propan-1-ol, butane, propan-1-one?
Thank you! :D
Re: Help! I need help for this explanation!
Is this post about a hands-on science project or is this a lab assignment? The experts here at Ask-the-Expert do not help with homework or lab assignments. If you are doing a science project, please provide more details, such as your hypothesis…
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Forum: Grades 9-12: Life, Earth, and Social Sciences
Microbiology
Microbiology
I am doing a science project where I am testing to see if dental treatments help reduce bacteria in a dogs mouth. So I am going to take a swab of the dogs mouth before and after given a dental chew, I will then transfer this to agar plates to grow? What is the best method to do this? Would I need a control? How do I count bacteria after it is grown?
Re: Microbiology
Hi PearlDaisy,
I hope you are having a great day! Below I have answered your questions and provided…
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Forum: Grades 6-8: Physical Science
Falling objects
Falling objects
Hi! Need some help for my son's science fair project about gravity and falling objects. He is supposed to make different objects fall at the same time from the same height to test if they hit the ground at the same time or not. We are having a hard time selecting the objects. We need 2 objects of same mass, 2 objects of same size, but different mass, and two objects of different size/shape but same mass. Could you post recommendations of household items we can…
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Forum: Grades 9-12: Physical Science
(HELP) Explore How Chromatography Can Unmix Mixtures
(HELP) Explore How Chromatography Can Unmix Mixtures
Hello so I am struggling on this specific project (https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p009/chemistry/paper-chromatography-advanced-version-1#procedure) and was wondering if anybody could help me or answer some of my questions.
1. In step 3 it states" Pour a small amount of your your first solvent (water) into the 100 mL beaker". I wondering if the…
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Forum: Grades 6-8: Life, Earth, and Social Sciences
Is my hypothesis for my lab report good??
Is my hypothesis for my lab report good??
Is this hypothesis good for my lab report? It is due tomorrow, and this is urgent, so please reply quickly. Thank you!
Based on research and gathered information, it is hypothesized that if an egg is soaked in different liquids, then the egg soaked in a liquid will shrink and become wrinkled because of osmosis, and the egg will be in a hypertonic state or the egg placed in a liquid will grow bigger and become…
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Forum: Grades 9-12: Life, Earth, and Social Sciences
DNA extraction from peppers
DNA extraction from peppers
Recently I've learned how to extract DNA from vegetables.
When me and my class were in the lab, we were devided into teams.
My team used red sweet pepper/ bell pepper.
Every team that used the peppers, got bad results- the DNA came out as red dots instead of white strings.
However, the teams that used onions or cucumbers got perfect white strings.
I wanted to ask- did it happen for a reason? or was there just a problem with the…
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Forum: Careers in Science
Käänteisen Puhelinnumero hakupalvelu - Kuinka sitä käytetään huijaavan aviomiehen tutkimiseen
Käänteisen Puhelinnumero hakupalvelu - Kuinka sitä käytetään huijaavan aviomiehen tutkimiseen
Ennen matkapuhelinten yleistymistä ei ole vaikeaa tunnistaa soittajaa linjan toisessa päässä. Asuntojen Puhelinnumero ja lankapuhelin voidaan sijoittaa onnistuneesti tavalliseen puhelinluetteloon tai puhelinluetteloon. Jos kuitenkin haluat jäljittää matkapuhelimen tai piilotettujen numeroiden omistajan,…
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