Category: Physics

How do you stay safe on a bike? 10 Ways to Stay Safe While Cycling Wear a Helmet. Not all states require bicyclists to wear a helmet. Check Your Equipment Before You Ride. Wear Reflective Materials. Keep Your Hands on the Bike. Know Your Signals and Use Them. Limit Your Distractions. Ride As If You’re […]

Why do rivers flow north to south? THE FACTS: Unless the land it totally flat, rivers of water run downhill. If the source of a river is at a higher elevation than the mouth, that river will run from the source to the mouth. However, if that (higher) source is to the south of the […]

What is prokaryotic cell give an example? Bacteria are examples of the prokaryotic cell type. An example is E. coli. In general, prokaryotic cells are those that do not have a membrane-bound nucleus. Besides bacteria, the cyanobacteria (blue-green algae) are a major group of prokaryotes. What are the two major types of eukaryotic cells? Eukaryotic […]

What is the world doing to stop global warming? For example, improvements to energy efficiency and vehicle fuel economy, increases in wind and solar power, biofuels from organic waste, setting a price on carbon, and protecting forests are all potent ways to reduce the amount of carbon dioxide and other gases trapping heat on the […]

How can you tell if a book is worth money? The easiest way to know how much your copy of a book is worth on the open market is to check on how much similar copies are currently being offered for. Fill out this form with enough information to get a list of comparable copies. […]

Do toilets flush differently in Southern Hemisphere? Is this possible? Can you actually use a flushing toilet to figure out whether you are in the Northern or in the Southern Hemisphere? Sadly, you cannot, because toilets tend to angle the jets that pass water into the bowl to drive the direction of draining water. Which […]

What is the relationship between air pressure and humidity? The water vapor molecules don’t travel far after a collision, so they collide more frequently. Therefore, as humidity increases (more water vapor in the air), air pressure decreases, and as humidity decreases, air pressure increases. What does 100 percent humidity mean? A reading of 100 percent […]

What information on a pedigree can tell you whether a gene is on an autosome? What information on a pedigree can tell you whether a gene is on a autosome or not a sex chromosome? If in a pedigree, the occurrence of the disorder is 50/50 between females and males, then it shows that it […]

What happens when arteries contract? The constriction of arterioles increases resistance, which causes a decrease in blood flow to downstream capillaries and a larger decrease in blood pressure. Dilation of arterioles causes a decrease in resistance, increasing blood flow to downstream capillaries, and a smaller decrease in blood pressure. Which blood vessels carry blood away […]

What happens if there are no predators around to eat sea urchins? With no predators around, sea urchin populations can multiply, forming herds that sweep across the ocean floor devouring entire stands of kelp and leaving “urchin barrens” in their place. Why are urchin barrens bad? Urchins have gotten a bad rap on the Pacific […]