How many harmonics are there? There are two types of harmonics in waves, they are even harmonic and odd harmonics. For example, a cylinder with both sides open will vibrate at both even and odd harmonics, but a cylinder with one closed side will vibrate at only odd harmonics. What is the difference between fundamental […]
What happens if the Earth spins backwards?
What happens if the Earth spins backwards? If Earth stopped rotating, it would be a disaster, but if it were to rotate backwards, it might not be as catastrophic. Trade winds at the equator, which normally blow westward, would reverse — hurricanes would no longer travel from east to west across the Atlantic. How long […]
What is positive and negative temperature coefficient?
What is positive and negative temperature coefficient? A positive coefficient for a material means that its resistance increases with an increase in temperature. A negative coefficient for a material means that its resistance decreases with an increase in temperature. What are the applications of P and N-type semiconductors? Diode is a combination of n-type and […]
How much does a tank of oxygen cost?
Do electric showers work without gas?
Do electric showers work without gas? You can use an electric shower regardless of the type of boiler or heating system you have, because it runs separately. Another great bonus of this is that you will still have access to hot water if your boiler breaks down. What showers are cheaper running? The electric shower […]
How do we classify psychological disorders?
How do we classify psychological disorders? The DSM-IV uses a multi-axial system of classification, which means that diagnoses are made on several different axes or dimensions. The DSM has five axes: Axis I records the patient’s primary diagnosis. Axis II records long-standing personality problems or mental retardation. What is categorized anxiety? Anxiety is a normal […]
Do dreams really mean anything Psychology Today?
Do dreams really mean anything Psychology Today? The theory states that dreams don’t actually mean anything. Instead they’re merely electrical brain impulses that pull random thoughts and imagery from our memories. However, renowned psychologist Sigmund Freud thought otherwise. He believed that dreams revealed unconsciously repressed conflicts or wishes. Are your dreams telling you something? Dreams […]
What household devices use mechanical energy?
What household devices use mechanical energy? Everyday Examples of Mechanical Energy Turning a doorknob. Breathing in and out. Hammering a nail. Riding a bicycle. Sharpening a pencil. Using kitchen appliances. Listening to music. Typing on a keyboard. What is the difference between kinetic and mechanical energy? The difference between kinetic and mechanical energy is that […]
What did the Earth look like in the Paleozoic Era?
What did the Earth look like in the Paleozoic Era? The Paleozoic Era, which ran from about 542 million years ago to 251 million years ago, was a time of great change on Earth. The era began with the breakup of one supercontinent and the formation of another. Plants became widespread. And the first vertebrate […]
Why is streak more reliable for mineral identification?
Why is streak more reliable for mineral identification? Streak is the color of a mineral’s powder. Streak is a more reliable property than color because streak does not vary. Minerals that are the same color may have a different colored streak. To check streak, scrape the mineral across an unglazed porcelain plate (Figure 5). Why […]