Category: Physics

What are two examples of secondary energy sources? Some examples of secondary energy resources include petroleum products, manufactured solid fuels and gases, electricity and heat, biofuels, and any other product made from primary resources. What are primary intermediate and secondary sources of energy? Secondary electricity is produced from heat of nuclear fission of nuclear fuels, […]

Are string lights a fire hazard? Christmas Lights can cause an electrical fire if used irresponsibly. If too many light strings are plugged into a single extension cord, the extension cord can overheat and cause a fire; this is known as a socket overload, or outlet overload. Will fairy lights catch fire? In general, fairy […]

What is the most dangerous UV radiation? UVB Can UV cause cancer? Too much UV radiation from the sun or sunbeds can damage the genetic material (the DNA) in your skin cells. If enough DNA damage builds up over time, it can cause cells to start growing out of control, which can lead to skin […]

What spot has the most geysers on Earth? Yellowstone National Park What is the No 1 cause of death in national parks? Drowning What 5 states have no national parks? States without National Parks are: Alabama, Connecticut, Delaware, Georgia, Idaho (see above,) Illinois, Iowa, Kansas, Louisiana, Maryland, Massachusetts, Mississippi, Nebraska, New Hampshire, New Jersey, New […]

Which is an example of a reactive aggression? Reactive aggression occurs in response to perceived threat and involves hostile attribution biases (Dodge and Coie 1987; Hub- bard et al. 2001; Lobbestael et al. 2013). An example of reactive aggression would be a teen punching a peer after the peer made fun of or teased him […]

Can you see muscle growth in a week? Gaining muscle is a slow process. It can take about three to four weeks to see a visible change. What happens when you start gaining muscle? When your body builds muscles, it burns energy and fat all the time. As your muscle mass increases, the faster your […]

What is the 1 in 4 rule for ladders? The base of the ladder should be placed so that it is one foot away from the building for every four feet of hight to where the ladder rests against the building. This is known as the 4 to 1 rule. At what height do you […]

Is diode on or off? In such a situation, the diode is said to be off or reverse biased. As long as the voltage across the diode isn’t negative, it’ll “turn on” and conduct current…. Ideal Diode Characteristics Operation Mode On (Forward biased) Off (Reverse biased) Voltage Across V=0 V<0 Diode looks like Short circuit […]

How accurate is bat sonar? Bats determine target distance, or range, from the delay of echoes, which is 5.8 ms/m (7-9). In principle, the high center frequency (f c = ≈60 kHz) and wide bandwidth (Δf = ≈80 kHz) of the big brown bat’s FM signals can support very accurate determination of delay (10, 11). […]

Why is Sirius called the Dog Star? Sirius is well known as the Dog Star, because it’s the chief star in the constellation Canis Major, the Big Dog. The early stargazers might have imagined the double-whammy of Sirius and the sun caused the hot weather, or dog days. In ancient Egypt, the name Sirius signified […]