Category: Physics

How much food is being wasted per year or every 10 years? An estimated 1.3 billion tonnes of food is wasted globally each year, one third of all food produced for human consumption. In ten years, the United States will waste the equivalent of 66 tons of food per second across the globe. What country […]

What is the input of a machine? Simple Machines | Short/Long Answer Questions Work input is work done on a machine to get the desired output. Work output is the amount of desired work that is done by a machine. For an ideal machine, the work output is equal to the work input i.e the […]

What happens to light rays as it passes through a convex lens? Convex Lens. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal […]

What is the half life of isotope B? There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of 8B, with a half-life of only 770 milliseconds (ms) and 12B with a half-life of 20.2 ms. All other isotopes have half-lives shorter […]

Can you see a molecule? This, believe it or not, is a microscope. It can help us see very small particles like molecules by feeling the particle with the tip of its needle. These very powerful microscopes are called atomic force microscopes, because they can see things by feeling the forces between atoms. … What […]

What do you mean by central orbit? A central orbit is an orbit in which the attractive force between a central mass and test mass is a central force, i.e., is directed towards the central mass. A general central force law is therefore given by. (1) for any function f(r), where is the force per […]

How do you use data to inform your instruction? 4 Ways Student Data Can Inform Instruction Use Data to Identify At-Risk Students. When it comes to at-risk students, early detection is critical. Use Data to Close the Learning Gap. Use Data to Predict Student Achievement on End-of-Year Targets. Use Data to Promote Success in Subsequent […]

What does bully for you mean? To treat in an overbearing or intimidating manner. To force one’s way aggressively or by intimidation. : : : : ADJECTIVE: Excellent; splendid. : : INTERJECTION: Used to express approval: Bully for you! Does bully mean good? (US, slang) Very good; excellent. A bully horse. (slang) Jovial and blustering; […]

Is no thanks rude? In America, “no thanks” isn’t rude as long as you say it in a pleasant manner. You could also say, “No, I’m good, thanks”, or “No, i’m ok.” Of course you can always say “No thank you” if you are worried about it. Is it OK to say no thanks? No […]

How do you find f1 and f2 when given the median? N = total student, f = frequency of the class containing median, cf = cumulative frequency before the median class, h = class interval…. Age (in years) Frequency (f) Cumulative Frequency (cf) 20 – 30 25 35+f1 30 – 40 30 65+f1 40 – […]