What causes a vortex in water? Vortices often form as a result of a difference in fluid speed – like when fast wind moves over slow wind. Because a vortex wants to keep its angular momentum, it keeps spinning as it moves through the water, and only loses a little bit of energy through friction […]
What are the extreme conditions of space?
What are the extreme conditions of space? Extreme conditions in the ISS space environment include exposure to extreme heat and cold cycling, ultra-vacuum, atomic oxygen, and high energy radiation. What organisms can live in extreme conditions? Most extremophiles are microorganisms (and a high proportion of these are archaea), but this group also includes eukaryotes such […]
Why is space important?
Why is space important? Space also provides earth with valuable metals, rare objects and precious materials that can be used for medical research. Space is playing a valuable role in saving lives. If NASA stopped exploring our universe, we would not know important facts about space and our solar system. What is a fact about […]
When two particles with like charges are close enough to interact is the potential energy positive or negative?
When two particles with like charges are close enough to interact is the potential energy positive or negative? The graphs of potential energy between two charges for like and unlike charges are shown below. For like charges, the potential energy is always positive, that is because we need to put energy in the system to […]
Which country is coal rich and oil poor?
Which country is coal rich and oil poor? India: Rich in coal but poor in energy. What is chemical formula of oil? The chemical formula for crude oil is CnH2n+2, where n is a positive integer. Crude oil is basically a combination of several hydrocarbon molecules, comprising hydrogen, H and carbon atoms, C. Among the […]
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How do you calculate area with pressure and force?
How do you calculate area with pressure and force? Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2. How is area related […]
Do magnets get stronger if you stack them?
Do magnets get stronger if you stack them? Once a magnet is fully magnetised, it cannot be made any stronger as it is fully ‘saturated’. As more magnets are stacked together, the strength will increase until the length of the stack is equal to the diameter. After this point, any further magnets added will provide […]
What is the oldest ice core sample?
What is the oldest ice core sample? The deepest ice core records come from Antarctica and Greenland, where the very deepest ice cores extend to 3 kilometers (over two miles) in depth. The oldest continuous ice core records extend to 130,000 years in Greenland, and 800,000 years in Antarctica. What two events must occur for […]