Ask an Expert (Page 174)

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

Hi, I need help doing my homework: Hi, I need help doing my homework: Let B be a 4x4 matrix to which we apply the following operations: 1. double column 1, 2. halve row 3, 3. add row 3 to row 1, 4. interchange columns 1 and 4, 5. subtract row 2 from each of the other rows, 6. replace column 4 by column 3, 7. delete column 1 (column dimension is reduced by 1). (a) Write the result as a product of eight matrices. (b) Write it again as a product of ABC (same B) of three matrices. Re: Hi, I need… Read more

Modeling climate change in Rainforests by the use of mesocosms

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

Modeling climate change in Rainforests by the use of mesocosms Modeling climate change in Rainforests by the use of mesocosms Hello, My idea is to Investigate plant growth of previously deforested areas of the rainforest where crops have been grown to feed cattle. To do this I will create four different mesocosms; one as a control, one using soil with nitrogen fertilizer, one using extreme heat, and one combining both the heat and the fertilizer. This is to demonstrate whether replanting… Read more

Adorption chemistry with kool-aid question

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

Adorption chemistry with kool-aid question Adorption chemistry with kool-aid question Hello: I have been doing this sciencebuddies experiment for my school science fair: https://www.sciencebuddies.org/science-fair-projects/projectideas/Chem_p106/chemistry/kool-aid-dye-adsorption#summary. I did the experiment on a few fabrics and at different temperatures, and I have the data. However, when I got to the section of analyzing the data, some steps confused me a little. The… Read more

Avoid The Shock Of Shocks (Electronics)

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

Avoid The Shock Of Shocks (Electronics) Avoid The Shock Of Shocks (Electronics) Hi! I'm trying to build the static electricity detector in this project [url]https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p050/electricity-electronics/electric-field-detector#procedure[/url] and I have built it correctly (I have checked this many times and rebuilt it as well). Everything seems to be wired correctly because when I connect the battery the LED turns on. The problem is the… Read more

Question about Program Drone Steering with an Arduino® activity

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

Question about Program Drone Steering with an Arduino® activity Question about Program Drone Steering with an Arduino® activity Type your question below and then press Submit! what is the objective for steering the drone with gesture control and also problem understanding ------------------------------------- Leave this to help the Experts: The activity can be viewed at: [url=https://www.sciencebuddies.org/stem-activities/program-drone-steering-arduino]Program Drone… Read more

Gravity on a spaceship from acceleration

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

Gravity on a spaceship from acceleration Gravity on a spaceship from acceleration So if i had a spaceship and it could go anywhere really fast but not too fast as i realise that if you go to accelerate to fast then you die. Anyway my question is that if i am in space with no gravity acting on me i will experience no weight but as soon as my spaceship start moving i move as well in the opposite direction to the spaceship. When i reach the wall of my spaceship it pushes against me and i move… Read more

Struggling to help my 5th grader understand the Liquid Density of Lamp Oil

Ask an Expert Topic Forum: Grades K-5: Physical Science

Struggling to help my 5th grader understand the Liquid Density of Lamp Oil Struggling to help my 5th grader understand the Liquid Density of Lamp Oil My daughter has just done the Seven-Layer Density Column Science Fair experiment found here https://www.stevespanglerscience.com/lab/experiments/seven-layer-density-column/ We are tracking that Lamp oil (refined kerosene) has an .81 density measurement and Rubbing Alcohol has a 0.79 density measurement. Although the numbers are showing that… Read more

copper measuring kit

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

copper measuring kit copper measuring kit I am doing a project for phytoremediation with plant. I bought copper measuring stripes to measure the copper uptake of a dried plant. But the copper test strip does not seem to work. any alternate ways to measure copper and sulfate? Re: copper measuring kit Hello! I don't know of any alternative methods for measuring copper uptake that wouldn't require access to expensive machinery in a chemistry lab. But I think the copper test strips should… Read more

Does Color Affect Taste?

Ask an Expert Topic Forum: Grades K-5: Life, Earth, and Social Sciences

Does Color Affect Taste? Does Color Affect Taste? I'm having trouble figuring out what the control would be for this experiment. Since we are using apple juice and adding different colors, I think that if we just have plain apple juice as the control would clue the students on what they were drinking which would skew the information. Can you help? [Administrator: link to project:… Read more

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