Category: Physics

What were the three main sources of power before the industrial revolution? Before the industrial revolution (18th century), energy use relied only on muscular and biomass sources. Most of the work was provided by manual labor and animals, while the biomass (mainly firewood) provided for heating and cooking energy needs. What was the most important […]

What is the current in the circuit? An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit. The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes. […]

Can a mute person scream? Can a mute person scream? Yes, they can. It usually doesn’t sound the same as when someone with full hearing screams, but they can and do. Can loud sound kill you? The general consensus is that a loud enough sound could cause an air embolism in your lungs, which then […]

What country owns Galapagos? Ecuador Can you stay on Galapagos Islands? Q: Are there hotels on all the Islands? A: The Galapagos has four inhabited islands that each offer hotel options: Santa Cruz, San Cristobal, Isabela, and Floreana. The other islands and islets of the archipelago are not inhabited by humans, and do not permit […]

What are the different types of reflective practice? Types of reflection Reflection-in-action and Reflection-on-action. Two main types of reflection are often referred to – reflection-in-action and reflection-on-action. Reflection-in-action. This is the reflection that takes place whilst you are involved in the situation, often a patient interaction. Reflection-on-action. What are the reflective practice models? One of […]

What makes an ecosystem successful? A healthy ecosystem consists of native plant and animal populations interacting in balance with each other and nonliving things (for example, water and rocks). Healthy ecosystems have an energy source, usually the sun. Decomposers break down dead plants and animals, returning vital nutrients to the soil. What are the two […]

Why is the lower fixed point of Fahrenheit is 32? On the Fahrenheit scale, the melting point of water is 32°F and the boiling point is 212°F (at standard atmospheric pressure). This puts the boiling and freezing points of water 180 degrees apart. Therefore, a degree on the Fahrenheit scale is ​1⁄180 of the interval […]

Where in the body are new blood cells made? Red blood cells are formed in the red bone marrow of bones. Stem cells in the red bone marrow are called hemocytoblasts. They give rise to all of the formed elements in blood. If a stem cell commits to becoming a cell called a proerythroblast, it […]

What is the contribution of John Dalton? Although a schoolteacher, a meteorologist, and an expert on color blindness, John Dalton is best known for his pioneering theory of atomism. He also developed methods to calculate atomic weights and structures and formulated the law of partial pressures. What parts of Dalton’s theory are still true? 1) […]

What are the 3 steps to preventing a collision? Depending on the situation, you can do one of these 3 things to prevent a collision: stop, steer away or speed up. Read the Collision Avoidance section to learn about the circumstances, when you can apply one or another technique and their advantages and disadvantages. What […]