Category: Physics

Is a cup of coffee an open system? For example, hot coffee in an open cup is an open system because it releases energy (heat) to the surrounding and we it can exchange matter (coffee) with the surroundings by taking out (drinking) or putting in (pouring). What are the stages of an open system? Open […]

How do you reset a Harbor Breeze fan? To reset your Harbor Breeze ceiling fan remote you need to turn the power off then on and then push the ‘reset’ button or ‘learn’ button under the back cover of the remote. Make sure you hold the reset button down until the light comes on and […]

Is it normal for a girl to have hairy arms? Not all women have hairy arms, but I’ve seen many women who have a decent amount of noticeable hair on their forearms. Some women have dark hair on their arms, which is noticeable when wearing short sleeves. Even blond hair is very noticeable in the […]

Does potential energy decrease in a cooling curve? All of the diagonal line segments on a heating or cooling curve show a temperature change and therefore a change in kinetic energy. However, all the energy that is absorbed or released is related to changes in potential energy. Remember the 3 Ps: Plateau, Phase change and […]

How many miles is in 30 minutes? 1 Expert Answer Since 30 minutes is 1/2 of an hour, you will drive 1/2 of 40 miles, or 20 miles. Is 1 mile in 15 minutes good? A noncompetitive, relatively in-shape runner usually completes one mile in about 9 to 10 minutes, on average. If you’re new […]

How hot will it be in 2020? A year ago, the agency estimated that 2020 would be 0.99C to 1.23C warmer than pre-industrial levels. Data from January to October this year indicates that the annual temperature will be 1.17C above the 1850-1900 average. 2016 remains the warmest year on record with 2020 vying for second […]

Is a car crash a balanced force? When the car crashes, there is no unbalanced force acting on the person, so they continue forward (Newton’s First Law). The person moves against the seat belt, exerting a force on it. The seat belt then exerts a force back on the person (Newton’s Third Law). This causes […]

Can a stable atom be made from oxygen and lithium? Can a stable compound be made from these two atoms? Explain why or why not.No, because oxygen wants two electrons to become stable and lithium will only give up one electron. What happens when lithium reacts with oxygen? Lithium burns with a strongly red-tinged flame […]

Is boron positive or negative? Atoms with a charge are known as IONS. More precisely atoms with a positive charge are known as cations while atoms with a negative charge are known as anions. Boron, above, forms a cation. Can hydrogen have a negative charge? The hydrogen anion, H−, is a negative ion of hydrogen, […]

What is the most important part of the building? The engineer calculates the design’s stress loads so he can make recommendations for load-bearing walls, holding straps, floor and attic joist sizes and foundations. But of all the elements in building a house, the most important part, the foundation, is usually ignored by the majority of […]