Category: Physics

Which is the best alternative energy source? Although there are many types of energy, the most efficient forms are renewable: hydro-thermal, tidal, wind, and solar. Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use. What is the number one killer of birds? cats […]

Should you cross your legs when doing pull-ups? Pull-up Mistakes: Crossed Legs Crossing your legs is also one of the pull-up mistakes. This mistake is related to pull-up mistake 3. Unknowingly, you could do this when you hang on a bar that is too low for you. You know it is too low if you […]

What are the horizontal rows called? Each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name. The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Groups are labeled at the top of each column. What family of elements does […]

What is lines and angle? Angle. An angle is formed when two lines intersect each other. We represent an angle by the symbol ∠. An angle involves two legs and one common vertex at which two lines meet. For example: ∠AOD is formed when line AB and CD intersect with each other. Which angles are […]

What are the two types of flame cutting torches called? There are two types of welding and cutting torches commonly used. They are the positive-pressure type (also known as an equal-pressure type or medium-pressure type torch), and the injector type. Does oxygen or acetylene light first? We recommend closing the oxygen valve first whenever turning […]

Why is there a gap between telephone wires? Solution: (a) Most telephone wires are made out of copper, which contracts with drop in temperature and hence breaks in winter if it becomes too tight between the poles. (c) The gaps are left between the successive rails for making space for their expansion when there is […]

How can you tell if a plant is vascular or nonvascular? Another difference is that a nonvascular plant doesn’t have roots like a vascular plant does. Instead, a nonvascular plant has rhizoids, small hairs that keep the plant in place. A vascular plant’s roots provide support and also soak up water from the area surrounding […]

What type of sonography pays the best? Here are the highest-paying specialties for an ultrasound technician: Vascular sonography. OB/GYN sonography. Cardiac sonography. Pediatric cardiac sonography. Neuro sonography. Is sonography a stressful job? Diagnostic medical sonographer was rated as the least stressful job. The position involves using medical imaging equipment like ultrasound machines. The second-least stressful […]

Is yellow lightning real? Lightning also can take on a range of colors, depending on conditions in the clouds and in the air. Yellow or orange lightning occurs when there is a large concentration of dust in the air. White lightning is a sign of low humidity or a little amount of moisture in the […]

What China gave to the world? Papermaking, printing, gunpowder and the compass – the four great inventions of ancient China-are significant contributions of the Chinese nation to world civilization. China was the first nation to invent paper. What was invented 2000 years ago? Date Invention or discovery Prehistory 2000 BCE Water-raising and irrigation devices like […]