Category: Physics

What happen when air heats up? What happens when air is heated or cooled? So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used […]

Should you always remember when handling microscope slides? When you hold a microscope slide, you should never hold the slide in the center. Why? Because if you hold it in the center, the slide will get dirty and the specimen that you will put on that slide might get dirt or when you look at […]

Who first wrote the Golden Rule? 1599 Edward Topsell writes that “Do unto others” serves well instead of other things that have been called golden rules. 1604 Charles Gibbon is perhaps the first author to explicitly call “Do unto others” the golden rule. What is the Silver Rule? silver rule (plural silver rules) (ethics) The […]

Are A and B Hermitian? For A and B hermitian operators, show that AB is hermitian if and only if A and B commute. but for hermitian operators, the RHS is BA which is equal to the LHS only when 0 = AB − BA = [A,B]. Do two Hermitian operators commute? In classical mechanics […]

Which of the following is not a amorphous solid? Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles. Note Quartz is a crystalline solid while quartz glass is an amorphous solid. This discussion on Which among the following is not an example of amorphous solids? a)Quartzb)Plasticc)Glassd)CokeCorrect answer is […]

Is current a phasor? All phasors are drawn referenced to the horizontal zero axis. Phasor diagrams can be drawn to represent more than two sinusoids. They can be either voltage, current or some other alternating quantity but the frequency of all of them must be the same. All phasors are drawn rotating in an anticlockwise […]

What can be done with materials which do not decay? Answer: Recycle the materials wich do nit decay. Reduces the amount of waste sent to landfills and incinerators. Conserves natural resources such as timber, water and minerals. Do banana peels whiten teeth? Unfortunately, there’s no evidence to suggest that banana peels really do whiten teeth. […]

What are two geological features? There are peaks, valleys, jagged edges, rolling hills, and everything in between. In general, we call these geological features, but this term is very broad and refers to any of the physical features on Earth’s surface. You might also hear them referred to as landscapes, topography, and landforms. What are […]

Is population growth exponential or linear? These graphs and R2 values seem to indicate that linear growth is the best model for the world population over the past 55 years, but there’s another way to show that it’s not exponential. As I said above, exponential growth occurs when the percentage growth rate remains constant as […]

What is another name for a port on routers? Often the router ports are called the router interface, the physical connection where the router connects to the network. Which 4 wires are used in cat5? These are just a few and it depends on the brand you buy. The four wire pairs in a CAT-5 […]