Category: Physics

What are the two main studies of physical science? In this lesson, we will discuss how physics and chemistry are considered to be the two main branches of physical science. We will also look at the overlap between physics and chemistry. What are the issues in science education? Some of the complex issues in the […]

What do liquid objects have in common? Liquids have the following characteristics: No definite shape (takes the shape of its container). Has definite volume. Particles are free to move over each other, but are still attracted to each other. Why doesn’t mass alone determine whether an object will float or sink? Density is the only […]

What does the 4 in 3/4 mean in music? The 3/4 time signature means there are three quarter notes (or any combination of notes that equals three quarter notes) in every measure. As we learned in the prior lesson, because there is a 4 on the bottom, the quarter note gets the beat (or pusle). […]

How many car lengths should you leave? Figure one car length for every ten miles an hour,” Barndt said. “So if you’re doing 55 miles an hour you should have six car lengths between you so that if something happens to the car in front of you, you have time to stop or react.” The […]

Why it is important to follow policies and procedures? Policies and procedures are an essential component of any organization. Policies address pertinent issues, such as what constitutes acceptable behavior by employees. Procedures clearly define a sequence of steps to be followed in a consistent manner, such as how the organization will respond to any policy […]

How do we know carbon dioxide is a greenhouse gas? This ability to absorb and re-emit infrared energy is what makes CO2 an effective heat-trapping greenhouse gas. Not all gas molecules are able to absorb IR radiation. For example, nitrogen (N2) and oxygen (O2), which make up more than 90% of Earth’s atmosphere, do not […]

What is the meaning of external development? External growth (also known as inorganic growth) refers to growth of a company that results from using external resources and capabilities rather than from internal business activities. The main advantage of external growth over internal growth is that the former provides a faster way to expand the business. […]

What is the 4 year 1 day rule for US citizenship? The 4 year 1 day rule applies to permanent lawful residents who were required to be in the U.S. for a continuous period of 5 years but who broke the continuity of their residence. The period of 4 year 1 day applies before you […]

Is it normal to hate roller coasters? While roller coasters are a popular theme park attraction, certain people feel nauseated, afraid, dizzy, or unsafe when riding roller coasters. In many cases, this fear is related to other phobias – such as acrophobia, claustrophobia or emetophobia – a condition like vertigo, or to a traumatic event. […]

How do you explain solubility to a child? Solubility is a measure of how much solute can be dissolved into a liter of solvent. Think of the example of water and salt. If you keep pouring salt into water, at some point the water isn’t going to be able to dissolve the salt. What is […]