Category: Physics

How do birds die from oil spills? For seabirds, oil can sink their natural buoyancy and literally drag them into a watery grave. And the birds that try to clean themselves ingest a sticky poison that ravages their livers, lungs, and intestines. Some lucky ones, however, get away with just a few smudges. How long […]

What does it mean if a star is red shifted? Ever since 1929, when Edwin Hubble discovered that the Universe is expanding, we have known that most other galaxies are moving away from us. Light from these galaxies is shifted to longer (and this means redder) wavelengths – in other words, it is ‘red-shifted’. What […]

What is a lever for Grade 5? A lever consists of a rigid bar, which is free to turn about a fixed point called a fulcrum. The fulcrum is a pivot point. The effort force (push or pull) is exerted upon one lever arm, and the other lever arm will go up or down in […]

Can I boil food in a vacuum sealed bag? Boiling in vacuum sealed bags is a great way to reheat food. If you have stored leftovers or done meal prep, this is an easy way to have a cooked meal in a short amount of time. Why do bags swell in the freezer? Bloating is […]

What does A and B represent in van der Waals? The constant ‘a’ gives the idea of the magnitude of attractive forces between the molecules of the gas and ‘b’ is the measure of effective volume occupied by the gas molecules in the van der Waals equation. It is also called co-volume or excluded volume. […]

Which plant organ transports substances up and down the plant? xylem Can a tree produce enough oxygen to keep a person alive? Trees absorb carbon dioxide through their leaves and break it down, releasing oxygen into the air. One mature tree can produce enough oxygen for up to 18 people, depending on the size and […]

What is the main function of meiosis? Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. What is difference between meiosis 1 and meiosis 2? Both produce […]

Why does a flame go out when you cover it? Why does the flame go out when the jar is covering it? The substance that reacts with the candle wax is oxygen. So, when that oxygen is used up, the reaction can’t keep going. Running out of oxygen makes the flame go out. Why is […]

How do you explain a prefix and a suffix? A prefix is a word part added to the beginning of a word that changes the word’s meaning. A suffix is a word part added to the end of a word that changes the word’s meaning. What are the suffix words? A suffix is a letter […]

What is advantage and disadvantage of nuclear energy? Pros and cons of nuclear power Pros Cons Low-cost energy Environmental impact Reliable power source Water intensive Zero-carbon emissions Risk of nuclear accidents Promising energy future Radioactive waste What is the best energy source and why? Nuclear Has The Highest Capacity Factor This basically means nuclear power […]