Category: Engineering

How many paper clips can an electromagnet pick up with 20 coils? Results Number of turns of wire Number of clips picked up – trial 1 Number of clips picked up – trial 2 20 7 8 30 11 12 40 16 15 50 19 19 How many paper clips can a magnet hold? It […]

How do you check your safe following distance? Basically all you do is count the seconds between when the car ahead of you passes something stationary (a road sign, a tree, the guy selling watermelons on the side of the road) and when you pass it. You want to try and hit that second following […]

How does the water cycle purify water? The water used by plants can go back into the earth by transpiration. The evaporation and condensation are the key terms that help water purifying. While these processes occur during the water cycle, it can also be used to purify water for drinking or industry use. Water is […]

What is the Kelvin Planck statement of the second law? The Kelvin–Planck statement (or the Heat Engine Statement) of the second law of thermodynamics states that it is impossible to devise a cyclically operating heat engine, the effect of which is to absorb energy in the form of heat from a single thermal reservoir and […]

What is domain ferromagnetism? In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. Their atomic makeup is such that smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. What is […]

How do you find the reliability of a parallel system? For example, if two components are arranged in parallel, each with reliability R 1 = R 2 = 0.9, that is, F 1 = F 2 = 0.1, the resultant probability of failure is F = 0.1 × 0.1 = 0.01. The resultant reliability is […]

What order should jumper cables be put on when jump starting a vehicle? Step 3: With both cars off and in “park,” connect the jumper cables in the following order: Connect one red clamp to the positive (+) battery post of the “dead” battery. Connect the other red clamp to the positive (+) post of […]

How do you calculate the magnetic flux density? The magnetic field vector B is defined by the force it would apply to a charge moving in it. B = F/qv, so the units are (N *s) / (C *m), which we call a Tesla, or T. This is also called flux density. Flux is then […]

How do you create a weighted scoring model? How to create and use a weighted scoring model Step 1: List out your options. This is the easiest step in the process. Step 2: Brainstorm your criteria. Step 3: Assign weight values to your criteria. Step 4: Create your weighted scoring chart. What is a weighted […]

What is the trace on an oscilloscope? Photo: An oscilloscope draws a trace (graph) of some quantity (plotted on the y-axis) that varies with time (plotted on the x-axis). One common pattern you’ll see is this smoothly undulating, snake-like up-and-down trace, which is called a sine wave or sinusoidal wave (green upper line). What is […]