Category: Physics

How do you prove a rhombus is a quadrilateral? To prove a quadrilateral is a rhombus, here are three approaches: 1) Show that the shape is a parallelogram with equal length sides; 2) Show that the shape’s diagonals are each others’ perpendicular bisectors; or 3) Show that the shape’s diagonals bisect both pairs of opposite […]

What is the safety device of electric fan? An RCD is a life-saving device that protects against dangerous electric shock and reduces the risk of electrical fires. Can an electric fan cause a fire? — If you’re using a fan to stay cool in these hot temps, be warned, they can be a fire hazard! […]

How far back can carbon dating date? C (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to approximately 50,000 years ago, although special preparation methods occasionally make accurate analysis of older samples possible. […]

Why do we need controls? Controls allow the experimenter to minimize the effects of factors other than the one being tested. It’s how we know an experiment is testing the thing it claims to be testing. This goes beyond science — controls are necessary for any sort of experimental testing, no matter the subject area. […]

When to Use Could you please? 2) could you please. This is used for formal addressing . For example addressing strangers or people who are in higher post/position than the addressee where you cannot ask for help without politeness. What makes beautiful writing? The most beautiful writing is that which uses those 26 letters in […]

Is Melting snow a physical change? Melting snow is a phase change, and therefore is a physical reaction and not a chemical one. Why is melting ice cream a physical change? Ice cream melting is a physical and reversible change because it is a solid and the sun’s heat is making it melt into a […]

Why does tightening a string increase pitch? Tightening the string gives it a higher frequency while loosening it lowers the frequency. This higher frequency of vibration means that the air particles around the string carry a higher frequency sound wave to your ear, which perceives the higher frequency as a higher pitch. What happens if […]

How do you know charges of elements? There are four ways to find the charge of an element: Use the periodic table. The usual charge of an element is common to its group. Use a chart. For a single atom, the charge is the number of protons minus the number of electrons. Find the charge […]

Is the mains AC or DC? AC stands for ‘alternating current’ which means the current constantly changes direction. Mains electricity is an AC supply, and the UK mains supply is about 230 volts. It has a frequency of 50Hz (50 hertz), which means it changes direction and back again 50 times a second. What is […]

What is another name for communication medium? The plural form is media, and the term is also known as a channel. The medium used to send a message may range from an individual’s voice, writing, clothing, and body language to forms of mass communication such as newspapers, television, and the internet. What are the most […]