Category: Physics

What is the relationship between inductance and current? This induced voltage created by the changing current has the effect of opposing the change in current. This is stated by Lenz’s law, and the voltage is called back EMF. Inductance is defined as the ratio of the induced voltage to the rate of change of current […]

What are the 4 stages of voice production? It involves four processes: Initiation, phonation, oro-nasal process and articulation. Why does my voice sound like it’s vibrating? When you speak, air from your lungs is pushed between two elastic structures—called vocal folds—causing them to vibrate and produce your voice. In spasmodic dysphonia, the muscles inside the […]

Is science the only way to know the truth? And while science is a powerful force in understanding the way the world works, it is not truth. To draw the distinction, there are facts. There are things we observe about the world around us. But science itself isn’t just a collection of facts about the […]

Is 230V RMS or peak? For example, a 6V AC supply means 6V RMS with the peak voltage about 8.6V. The UK mains supply is 230V AC; this means 230V RMS so the peak voltage of the mains is about 320V! Is 240 volts rms or peak? With a pure sinusoidal waveform the voltage that […]

How many minutes a day should I exercise to lose weight? As a general goal, aim for at least 30 minutes of physical activity every day. If you want to lose weight, maintain weight loss or meet specific fitness goals, you may need to exercise more. What are the 7 healthful ways to lose weight? […]

Who invented circular motion? Newton Why is circular motion important in our daily lives? Circular motion is very common and very important in our everyday life. Satellites, the moon, the solar system and stars in galaxies all rotate in “circular” orbits. The term circular here is being used loosely since even repetitive closed motion is […]

What causes the attractive forces between particles in matter? The particles that make up some matter are close together and vibrate back and forth. If the motion of particles slows the particles move closer together. This is because the attraction between them pulls them toward each other. Strong attractive forces hold particles close together. What […]

Who are the only two players in the box during a penalty kick? The goalie and the penalty kick taker are the only players allowed in the penalty area until the kick is taken. They have to make split second decisions as the shot is being taken. Where will the kick be placed and how […]

What type of microscope do doctors use? Electron microscopes use concentrated beams of electrons and dyes to illuminate their specimens. These electron beams have very short wavelengths, which means they are able to produce exceptionally high-resolution images. Clinics can utilize these scopes to identify and examine viruses within the bloodstream. How can a microscope be […]

Why do you set the altimeter? Weather changes that affect temperatures and air pressures cause the complications in understanding and using an altimeter. This is why an aircraft’s actual height above mean sea level is its true altitude while what the altimeter says is the indicated altitude. Before going flying, you have to set the […]