Category: Physics

What is the direction of drag force? Drag is a force and is therefore a vector quantity having both a magnitude and a direction. Drag acts in a direction that is opposite to the motion of the aircraft. Lift acts perpendicular to the motion. Is buoyancy a drag force? Drag is due to frictional resistance […]

How is a nucleus formed? The vesicles first fuse to form membranes around individual chromosomes, which then fuse with each other to form a complete single nucleus. What is the nucleus covered by? nuclear membrane Why nucleus is the most important organelle? The Nucleus contains the genetic material, also known as DNA, which is responsible […]

How do you find the mass of a disc? Mass of a Thin Disk m=2πR∫0rρ(r)dr. How do you find the density of a rod? The density can be found with the formula, density equals mass over volume (d = m/v): The mass is given m = 540 grams, you can plug that into the formula […]

What is the average of first 17 odd natural number? The number series 1, 3, 5, 7, 9, . . . . , 33. Therefore, 289 is the sum of first 17 odd numbers. What is the average of first 90 odd numbers? 91 What is the average of first 100 odd numbers? 100 is […]

What are three properties of a permanent magnet? 3 properties of a magnet: The three properties that all magnets have are that they all attract certain metals, they have north and south poles, and two of the same poles will repel each other, while opposite poles will be attracted to each other. Which metals do […]

What happens when a sound source is moving? When the sound source moves toward an observer, each successive wave is emitted closer to the observer than the previous wave and takes just a little less time to reach the observer than the previous one. Since the time between waves is reduced, the frequency is increased. […]

Where we use A and an? Use “a” before words that start with a consonant sound and “an” before words that start with a vowel sound. Other letters can also be pronounced either way. Just remember it is the sound that governs whether you use “a” or “an,” not the actual first letter of the […]

What can a student do about climate change? Make sure the lights are off if you are the last to leave the classroom, take shorter showers, and consume less meat and dairy products are all good ways you can reduce your personal footprint. Taking the time to get involved in conservation efforts in your area […]

Can magnetic fields interact with each other? When two magnets are brought close together, their magnetic fields interact. You can see how they interact in the Figure below. The lines of force of north and south poles attract each other whereas those of two north poles repel each other. When electric and magnetic fields both […]

What happened to the pregnant wife in Chernobyl? One of the main characters in HBO’s miniseries “Chernobyl,” the pregnant wife of a young firefighter, still lives in Ukraine. The real-life Lyudmilla Ignatenko recently told the BBC that reporters have accused her of killing her unborn child. Why did Chernobyl cause birth defects? A 2010 study […]