Category: Physics

What keeps a bridge from falling down? They do it by carefully balancing two main kinds of forces called compression (a pushing or squeezing force, acting inward) and tension (a pulling or stretching force, acting outward), channeling the load (the total weight of the bridge and the things it carries) onto abutments (the supports at […]

Who drives the ship? A helmsman or helm is a person who steers a ship, sailboat, submarine, other type of maritime vessel, or spacecraft. Can a ship captain really marry you? A ship’s captain generally does NOT have the legal right to officiate a wedding at sea. In order for a Captain of a ship […]

Can a fact be disproven? A basic principle in science is that any law, theory, or otherwise can be disproven if new facts or evidence are presented. If it cannot be somehow disproven by an experiment, then it is not scientific. Take, for example, the Universal Law of Gravitation. What is a opinion statement? An […]

What are 5 examples of delegated powers? Some examples of powers delegated to the federal government include declaring war, entering treaties, coining money, levying taxes, establishing import duties and tariffs, raising and maintaining the armed forces, and regulating commerce. What are 3 types of delegated powers? There are three distinct types of delegated powers: expressed, […]

Is the phosphorus cycle fast? Phosphorus moves slowly from deposits on land and in sediments, to living organisms, and than much more slowly back into the soil and water sediment. The phosphorus cycle is the slowest one of the matter cycles that are described here. How does the phosphorus cycle start? Phosphorus moves in a […]

How many watts is a 10 hp motor? 7680 watts How many watt is 1kVA? 900 watts What is the difference kVA and kW? The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. kW is the unit of real power and kVA is a unit of apparent power (or real power […]

Are cameras more accurate than mirrors? A mirror image is called a mirror image because it reverses things from left to right. You usually see a mirror image of yourself. In contrast, if you look at a normal camera photo, you see yourself as another person would see you. Mirrors are much more accurate than […]

How is the first day of winter decided? In the United States and the rest of the northern hemisphere, the first day of the winter season is the day of the year when the Sun is farthest south (on December 21st or 22nd). This day is known as the Winter Solstice. The declination of the […]

Can you walk to the North Pole? If you opt for an on-board expedition to the North Pole, your Arctic cruise will venture northbound through the Arctic Ocean seeking out whales in the Barents Sea (read our Arctic whales guide) before crossing the boundary of the North Pole, 90 degrees North, so you can literally […]

What affects the EMF of an electrochemical cell? Electrochemical cells are different from normal reactions; however the amount of volts produced by the cell will be effected by the factors that affect chemical reaction rates. The main factors that affect chemical reactions are Temperature, Surface area and Concentration. How do you calculate cell EMF? Sample […]