Category: Physics

What is the heat capacity of ice? The specific heat capacity of water at -10 degrees Celsius (ice) is 2.05 joules/gram * degree Kelvin. The specific heat capacity of water at 100 degrees Celsius (steam) is 2.080 joules/gram * degree Kelvin. Why does Smart Water not freeze? It’s more or less impossible to get solid […]

Why do human eyes not glow in the dark? Although pigment from the retina and from pupil can influence the color of the shine, most of it comes from the slight differences in levels of elements like zinc in the reflective layer. It’s the lack of this layer that causes humans to have shining eyes […]

Is work done when sitting? Work is done when a force that is applied to an object moves that object. Driving to your job is not work because you just sit, but the energy your car engine uses to move the car does work. You have to exert a force AND move something to qualify […]

How does velocity affect speed? Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio. […]

What 2 groups are very reactive with water? You get less precipitate as you go down the Group because more of the hydroxide dissolves in the water. The Group 2 metals become more reactive towards water as you go down the Group. There is an additional reason for the lack of reactivity of beryllium compared […]

What is the relationship between gas and pressure? For a fixed mass of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle’s law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice […]

What is the graph used for? Graphs are a common method to visually illustrate relationships in the data. The purpose of a graph is to present data that are too numerous or complicated to be described adequately in the text and in less space. Do not, however, use graphs for small amounts of data that […]

How do air masses get their properties? The properties of air masses are determined by the the underlying surface properties where they originate. Once formed, air masses migrate within the general circulation. Upon movement, air masses displace residual air over locations thus changing temperature and humidity characteristics. What do the properties of an air mass […]

How many plants are there in the desert? There are at least 2,450 native plant species found in California’s desert, according to a great article by Chris Clarke on desert life, posted at KCET. If you want to learn more about our amazing deserts, join Desert Biodiversity, a new organization dedicated to exploring, respecting and […]

How do you write a scalar value in SQL? Creating a scalar function First, specify the name of the function after the CREATE FUNCTION keywords. Second, specify a list of parameters surrounded by parentheses after the function name. Third, specify the data type of the return value in the RETURNS statement. How do you create […]