Category: Physics

What is Joule formula? In equation form: work (joules) = force (newtons) x distance (meters), where a joule is the unit of work, as defined in the following paragraph. In symbols: W = F x d. In practical terms, even a small force can do a lot of work if it is exerted over a […]

Why is it important to have evidence? Evidence is used to back up or refute arguments, and it helps us to make decisions at work. Using evidence allows us to work out what is effective and what is not. Evidence indicates the ideas that are effective and those, which are not meaning that programs are […]

Which functions are continuous and differentiable everywhere? In mathematics, the Weierstrass function is an example of a real-valued function that is continuous everywhere but differentiable nowhere. It is an example of a fractal curve. Is every continuous function is integrable? What we get from this is that every continuous function on a closed interval is […]

How do I know if my tub is cast iron? If you can see the tub from underneath and it looks black it is probably cast iron. If it is more like bright metal it is steel. If you want, remove the overflow cover and popup lever from the head end of the tub and […]

What is the formula for aluminum oxide and why? Aluminum oxide has a chemical formula Al2O3. It is amphoteric in nature, and is used in various chemical, industrial and commercial applications. How do you activate aluminum oxide? The preparation method comprises the following steps: (1) dissolving and hydrolyzing solid sodium tetrachloroaluminate by using an ethanol […]

What is the most famous line of longitude? Prime Meridian What is International Date Line Why is it not a straight line? The Dateline Is Not Straight The dateline runs from the North Pole to the South Pole and marks the divide between the Western and Eastern Hemisphere. It is not straight but zigzags to […]

What kind of mixture is salt solution and seawater? The salt water described above is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. Often it is easy to confuse a homogeneous mixture with a pure substance because they are both uniform. The difference is that the composition of the […]

How do you remove a stuck metal lid? Warm water Alternatively, you could fill a bowl with hot water and place the jar upside down in the water, leaving it there for around 30 seconds. The hot water will help expand the metal lid (more so than the glass), making it easier to remove. Does […]

What is SI unit of sound? The SI unit of sound pressure is pascal (Pa). Decibel (dB) is a relative unit of measurement widely used in acoustics. However, the dB is not a unit in the sense that a metre is a unit of length. The decibel is a logarithmic unit used to describe a […]

What happens to the particles when a liquid boils? Boiling. If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. As the liquid gets warmer more particles have sufficient energy to escape from the liquid. Eventually even particles in the middle of the liquid form bubbles […]