Is roasting a marshmallow over a campfire radiation? Burnt marshmallow is simply a marshmallow that has been extremely toasted! There are two main processes that heat a marshmallow: absorption of campfire radiation (photons) and contact with very hot air rising off the fire (convection). If we place the marshmallow directly above the fire, we get […]
Which is better AC or DC current?
Which is better AC or DC current? DC power is significantly more energy efficient than AC power. DC motors and appliances have higher efficiency and power to size characteristics. DC-based lighting (LED) is as much as 75% more efficient than incandescent lighting. Is AC safer than DC? A.C. is said to be four to five […]
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 […]
Does eyesight improve after quitting drinking?
Does eyesight improve after quitting drinking? For example, after just 24 hours of no alcohol, your blood sugar levels will normalise and blurred vision caused by alcohol intake will disappear. “The longer you abstain you may also notice your eyes become brighter and whiter, as your body counteracts damage/yellowing of the sclera – the white […]
Why do we need to conserve energy?
Why do we need to conserve energy? First of all, reducing energy use limits the number of carbon emissions in the environment. In turn, conserving energy produces a higher quality of life. Reduced emissions result in cleaner air quality. In addition, it helps create a healthier planet, or at least helps sustain the resources we […]
Which is the best example of law of conservation of mass?
Which is the best example of law of conservation of mass? The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first […]
What is an example of a mirage?
What is an example of a mirage? An example of a mirage is when you believe you see water or a ship in the desert when it isn’t really there. An optical phenomenon that creates the illusion of water, often with inverted reflections of distant objects, and results from distortion of light by alternate layers […]
What are the basic steps in transforming sound waves?
What are the basic steps in transforming sound waves? The outer ear collects sound waves, which are translated into mechanical waves by the middle ear and turned into waves in the inner ear. The auditory nerve then translate the energy into electrical waves and sends them to the brain, which perceives and interprets the sound. […]
Is it harder to draw or paint?
Is it harder to draw or paint? Many people consider painting to be more difficult than drawing because most artists learn to draw first. You start out drawing, which makes it seem only natural that painting is a more advanced technique. If most artists started out painting first, then the general consensus would probably be […]
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 […]