Category: Physics

Why the Colour of shadow is always black? Shadows most often appear black because the visible light cannot make its way past the obstruction, if there is no light falling on an object then it will be black as there is no light to reflect. As to why black is the absence of light, it […]

Do humans have gill slits? …and other nonaquatic vertebrates exhibit gill slits even though they never breathe through gills. These slits are found in the embryos of all vertebrates because they share as common ancestors the fish in which these structures first evolved. Human embryos also exhibit by the fourth week of development a well-defined… […]

How do you solve relative error? To calculate relative error, subtract the measured value by the real value and then divide the absolute of that number by the real value to get the relative error. We can then multiply by 100% to get the percent error. What is actual error? The actual error, as said […]

Is 30 degrees water hot? In general, hot water is 130 F (54.4 C) or above. Warm water is between 110 and 90 F (43.3 to 32.2 C). Cold water is generally between 80 and 60 F (26.7 to 15 C). Is it OK to wash towels at 30 degrees? A 30-degree wash is fine […]

What is the darkest phase of the moon? The moment a thin sliver of the Moon becomes visible after New Moon is the beginning of the first intermediate phase, the Waxing Crescent Moon. In the past, this used to be called New Moon while the darkest phase was called Dark Moon. How long does the […]

How do you tell if the tide is coming in or out? You can tell if the tide is coming in or out by reading a local tide table since they list the predicted times that the tide will be highest and lowest. In the time that the tide shifts from its lowest point to […]

What is the electron group geometry of cl2o? Structure. The structure of dichlorine monoxide is similar to that of water and hypochlorous acid, with the molecule adopting a bent molecular geometry (due to the lone pairs on the oxygen) and resulting in C2V molecular symmetry. How many electron groups are in SF2? Each bond uses […]

What are some examples of decomposers? Examples of Decomposers in Terrestrial Ecosystems Beetle: type of shredder that eats and digests detritus. Earthworm: type of shredder that eats and digests detritus. Millipede: type of shredder that eats and digests detritus. Mushroom: type of fungi that grows out of the ground or the dead material it’s feeding […]

Which types of wheels Cannot be used with a tubeless tire? Explanation: Wire wheels cannot be used with a tubeless tire. Wire wheels are expensive due to their construction. The rim of a wired wheel has holes, due to which it is not possible to fit tubeless tires on wire wheels. Which is better tube […]

Did they used to spray kids with DDT? Is it safe? DDT was sprayed in America in the 1950’s as children played in the spray, and up to 80,000 tons a year were sprayed on American crops. There is some research suggesting that it could lead to premature births, but humans are far better off […]