Category: Physics

Is 18k magnetic? Gold is a metal that will not attract a magnet. To test is 18k gold real, hold it next to a magnet. If the magnet sticks to your jewelry, then it does not have a high percentage of gold but is made up of other, more magnetic metals. Is the vinegar test […]

What is the two properties of gravity? Property 1: The gravitational force is a long-range force, which exists between two particles, regardless of the medium that separates them. Property 2: The gravitational force is directly proportional to the product of the mass of the two bodies. This means a larger mass will yield a larger […]

What is the formula for oxygen? O₂ Is oxygen a mixture? *Note: pure oxygen gas consists of molecules but it is still considered an element, rather than a compound, as the molecules are made up of a single type of element….Pure Substances. Pure Substance Element or Compound? Consists of: Ammonia (NH3) compound ammonia molecules Is […]

What are the natural variables of Helmholtz free energy? The natural variables are temperature, T, and volume, V . If the temperature and volume are held constant, the system will reach the equilibrium state (pressure, P, and entropy, S) with the minimum Helmholtz free energy. What are the four thermodynamic functions? Four important and useful […]

How does the Industrial Revolution affect the evolution of the peppered moth? After the pollution from the Industrial Revolution started affecting trees, most of the collected peppered moths were of the dark form. Click for more detail. As the trees darkened with soot, the light-colored moths were easier to see. They lived longer and passed […]

How do you give good reasoning? Each time you make a choice, there are consequences. A good way to improve reasoning skills is to make a point of stopping to consider those consequences on a conscious level. Use your imagination. Before making a choice in a given situation, pause to imagine a variety of possible […]

What does it mean when a force is balanced? Balanced forces are equal in size and opposite in direction. When forces are balanced, there is no change in motion. In one of your situations in the last section, you pushed or pulled on an object from opposite directions but with the same force. What is […]

What is the SI unit of current? ampere How do you measure current in a DC circuit? It is measured in the unit of the Ampere, simply called “Amp,” (A). The most common way to measure current in a circuit is to break the circuit open and insert an “ammeter” in series (in-line) with the […]

What directly causes action potential? An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an axon until it reaches the terminal button. Which part of motor neuron has lowest threshold? axon […]

What is the ideal problem solving method? IDEAL model consisting of five indictors including (1) Identify the problem: trying to identify problems and make them an opportunity to do something creative, (2) Define goals: set goals in a problem, (3) Explore solution: explore alternative approaches to solving problems, (4) Act on the strategy: anticipate results […]