Category: Physics

How can the direction of the magnetic field be reversed? The direction of the current must be reversed every half turn, otherwise the coil comes to a halt again. This is achieved using a conducting ring split in two, called a split ring or commutator. A coil of wire is used with lots of turns […]

Are opposite rays equal? A pair of opposite rays are two rays that have the same endpoint and extend in opposite directions. Rays are always named with two points and the first point in the name must be the endpoint. So, when you name opposite rays, the first letter in the name of both rays […]

What is the amount of heat energy released when 50.0 grams of water is cooled from 20.0 C to 10.0 C? – 2093 When 25.0 grams of water are cooled from 20.0 C to 10.0 C the number? Answer: 1045 J of energy was released on cooling the down the water from 20 °C to […]

How often does a roof need dethatching? Generally the ridge of the thatch will require replacing every 10 – 15 years. The coatwork will vary depending on the material used and its associated lifespan. To keep the roof in best condition: Allow it to dry well, remove trees and plants which may hinder the sun […]

Is US on UK Red List? There will be different travel restrictions for each group; the U.K. and the U.S. are on the amber list, which crucially only allows non-essential travel for vaccinated travelers. All EU countries are rated green, meaning they can visit without any travel restrictions. Is America allowing UK tourists? The USA […]

What is the IQ of Stephen Hawkings? 160 Do black holes ever go away? If black holes evaporate under Hawking radiation, a solar mass black hole will evaporate over 1064 years which is vastly longer than the age of the universe. A supermassive black hole with a mass of 1011 (100 billion) M ☉ will […]

How many chromosomes are in sex cells? In humans, cells other than human sex cells, are diploid and have 23 pairs of chromosomes. Human sex cells (egg and sperm cells) contain a single set of chromosomes and are known as haploid. Are sex chromosomes only found in sex cells? This XY sex-determination system is found […]

What is the setting of the Jack and the Beanstalk? There are several answers to the question “what is the setting of Jack and the Beanstalk?” One answer is that there is no real setting – the story takes place in your imagination, or wherever you happen to hear it. You could also say that […]

What colleges have won national championships in football and basketball? The top two that have won titles in both sports are Michigan and UCLA, with 12 apiece. Of Michigan’s titles, 11 come in football, while 11 of UCLA’s come in basketball. How many schools have won a national championship in football and basketball in the […]

What is type of hypothesis? A hypothesis is an approximate explanation that relates to the set of facts that can be tested by certain further investigations. There are basically two types, namely, null hypothesis and alternative hypothesis. A research generally starts with a problem. These two hypotheses can be tested, though. Why is research a […]