Does an object moving with a constant velocity require a force to keep it moving? An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. In the absence of any forces, no force is required to keep […]
What are you blind spots?
What are you blind spots? When light lands on your retina, it sends electrical bursts through your optic nerve to your brain. Your brain turns the signals into a picture. The spot where your optic nerve connects to your retina has no light-sensitive cells, so you can’t see anything there. That’s your blind spot. What […]
What are the two factors affecting gravity?
What are the two factors affecting gravity? When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. Where is center […]
How strong would gravity be if the Earth stopped spinning?
How strong would gravity be if the Earth stopped spinning? The centrifugal force at the equator is only 1/289 of normal gravity, or 0.35%. That’s too small to be perceived. It gradually diminishes as you move away from the equator, and becomes zero at the poles. In any case, if Earth stopped rotating, the added […]
Can airbags knock you out?
Can airbags knock you out? Airbags exert a lot of force, so it is possible to be hurt by one. Sitting too close to a deploying airbag can result in burns and injuries. Under certain, very specific circumstances, you may also take your car to a mechanic to have the passenger-side airbag switched off [source: […]
What to do if GFCI keeps tripping?
How do parasitic organism derive their nutrition?
How do parasitic organism derive their nutrition? The parasite obtains nutrition directly from the body of the host. Since these parasites derive their nourishment from their host, this symbiotic interaction is often harmful to the host. Parasites are dependent on their host for survival since the host provides nutrition and protection. What are the two […]
What is produced when sodium reacts with water?
What is produced when sodium reacts with water? In what way and in what form does sodium react with water? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction. Sodium metal is heated and may ignite and burn with a characteristic orange flame. […]
What is black body curve?
What is black body curve? Black-body radiation becomes a visible glow of light if the temperature of the object is high enough. A graph of the amount of energy inside the oven per unit volume and per unit frequency interval plotted versus frequency is called the black-body curve. Different curves are obtained by varying the […]
Is there just educated guess?
Is there just educated guess? People refer to a trial solution to a problem as a hypothesis, often called an “educated guess” because it provides a suggested outcome based on the evidence. However, some scientists reject the term “educated guess” as incorrect. What is an educated guess that can be tested? Hypothesis : an idea, […]