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How To
Do you have a question about how to do something? Looking for a handy guide? This Topic is for people to find "How To" guides to solve their problems, and for people who like to write guides and help others solve their more complex problems.
25,034 Questions
How to remove mildew odor from a washer?
Run the washer through a wash cycle (no laundry, though) with very hot water and a cup of bleach. This should remove the mildew and odors from the washer. Just be sure to let it go through the entire wash and rinse cycle. Then leave the lid to the washer open to let it air dry.
Displacement can be found by calculating the difference between the final position and the initial position of an object. It is a vector quantity that includes both magnitude (distance) and direction. It can be determined using the formula: Displacement = Final position - Initial position.
Velocity is a vector quantity, so you need to express velocity in terms of both speed and direction.
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The simple (but incomplete) answer is to divide the distance over time in the direction travelled. For example, 25 miles per hour north is a velocity.
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This answer is suitable for at least 99% of everyday life situations.
More Complete AnswerThe scientifically accurate (but long) answer is actually quite complicated. Note this description does not apply to measuring the velocity of light. And remember, velocity must always be expressed as both speed and direction.
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Speed (distance over time) is always measured with respect to an arbitrary point of reference - speed is never absolute. For common purposes, most people either use themselves or the ground as an arbitrary local point of reference. For example, a car said to be travelling at 100 kilometers per hour is travelling that speed with respect to the ground. The ground is the arbitrary local reference point. In another example, a boy on a moving train throws a ball down the isle at 10 miles per hour. The speed is expressed relative to the boy, but if the train is travelling 50 miles per hour relative to the ground, then the ball travels at either 40 mph or 60 mph relative to the ground, depending upon which direction the boy threw the ball.
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Speed can be expressed relative to another moving object (technically all objects move). For example, you could say that two jet aircraft flying head-on in a collision course are closing at a speed of 1,800 km/h. In this case, each aircraft uses the other aircraft as the arbitrary local reference point.
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Expressing speed becomes more difficult when there are no easy arbitrary reference points. For example, how do you express the speed of a space probe travelling from Earth to Jupiter? You might think using the ground you are standing on as the arbitrary reference point makes sense, but in fact that proves to be utterly useless. Consider that the equatorial surface of the planet Earth spins around at a speed of 1,667 kilometers per hour with respect to the earth's rotational axis. So the speed of the space probe, using an arbitrary point on the Earth's surface as a reference point, changes dramatically from daytime to nighttime, when at one moment the ground you are standing on is spinning toward the probe, and in the other moment you are receding from the probe, with a net difference of over 3,200 km/hr. So why not use the Earth's center as the reference point? To further complicate the issue, in the summer/fall, the earth might fly away from the probe in its orbit around the sun, and in the winter/spring, the earth could be racing toward the probe (the seasons could be different - I am just using these seasons as an example). The earth orbits around the Sun at a speed of 106,700 km/hr with respect to the Sun, so the speed of the probe with respect to the center of Earth changes by over 200,000 km/hr from winter to summer. There must be a better way.
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In the case of the space probe, the center of the sun is the best arbitrary reference point. That is why space operators launch probes at a time of year when the planet Earth is closing toward the destination point at its fastest relative speed - because the space probe gains orders of magnitude more speed from the earth's orbital speed around the sun than the probe could hope to gain from its own rocket engines. If the space probe were to leave our solar system and visit other worlds, even our Sun would no longer be a useful arbitrary point of reference, as explained below.
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Direction is always expressed with respect to an arbitrary frame of reference. For example, you could say the direction is up, north, towards the sun, or counterclockwise. Changing the frame of reference changes your understanding of direction. For example, someone pointing 'up' in Tokyo is pointing to a completely different cluster of stars than someone pointing 'up' at the same moment while standing in Paris. The direction 'north' is the same for all points on the earth only when standing exactly on the equator. At the exact south pole, you could point in any and all direction (save directly 'up') and you would be pointing north. The concept of clockwise depends upon from which side you view the clock.
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When velocity is expressed in local terms - that is, when the frame of reference does not extend beyond about 100 km - then the usual terms for direction (north, up, etc.) suffice. But as soon as velocity is expressed in a context that considers more than a few hundred kilometers, the terms 'north', 'up', etc. begin to lose their usefulness as a reliable expression of direction. In astronomy, directions are most commonly expressed with respect to the center and ecliptic plane of the solar system or of the galaxy, known as the ecliptic coordinate system and galactic coordinate system, respectively.
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Velocity does not need to be a linear value. For example, the angular (rotational) velocity of a merry-go-round can be expressed as 0.3 radians per second clockwise when viewed from above. Similarly, the Earth can be said to rotate at an angular velocity of 15o per hour counterclockwise when viewed from the star Polaris.
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In conclusion, velocity is distance, or angular displacement, over time in a specific direction with reference to an arbitrary frame of reference. You must understand that frame of reference to correctly interpret the intended meaning of the expressed velocity.
Chlorine can be toxic in high concentrations, leading to irritation of the skin, eyes, and respiratory system. Ingesting or inhaling large amounts of chlorine gas can cause severe health issues, including chemical burns, lung damage, and in extreme cases, death. Proper handling and ventilation are crucial when working with chlorine to minimize the risk of toxicity.
To overcome gravity, one would need to generate enough force to counteract its pull. This can be achieved through technologies like rockets for space travel or by utilizing principles of buoyancy in water. Ultimately, gravity is a fundamental force of nature that cannot be fully repealed, but its effects can be mitigated.
How to get a yellow stain out of white pants?
Mix equal parts of hydrogen peroxide and water, then apply the mixture to the stain and let it sit for 15-30 minutes before laundering as usual. If the stain persists, repeat the process or try using a stain remover specifically designed for yellow stains.
To mention CTC in resume you are supposed to list it under your academic qualifications. You may also list under it under the professional qualification if you have done work that is CTC related.
Rivatuner is a software that allows you to monitor and customize your graphics card settings, such as fan speed and overclocking. To use it, download and install the program, open it, and then navigate to the settings you want to adjust. Be cautious when making changes, as incorrect settings could potentially damage your hardware.
How to express 27000000 using 1 significant figure?
The number 27000000 expressed using 1 significant figure is 3 x 10^7.
How to Balance the following equation HCl plus Na2S------H2S plus NaCl?
The balanced equation is 2HCl + Na2S → H2S + 2NaCl. This is balanced as the number of atoms of each element is the same on both sides of the equation.
How to calculate Relative retention time?
Divide the retention time of the peak of ineterest (ex. 14.8 min.) by the retention time of the main peak (ex. 15.9 min.) 14.8/15.9 = 0.93 Therefore your RRT is 0.93 Remember, any peak with an RRT <1 elutes before the main peak, and any peak with an RRT >1 elutes after the main peak! What is RRT & RRF in hplc
How to treat Well water too acidic from pine needles?
One way to treat well water that is too acidic from pine needles is to install a neutralizing filter that can raise the pH level of the water. Another option is to use a calcite filter which can help in neutralizing the acidity of the water. Regularly testing the water's pH level and adjusting the treatment method accordingly is also important.
How to handle sulfuric acid safely?
When handling sulfuric acid, always wear appropriate personal protective equipment such as gloves, goggles, and an apron. Store and transport sulfuric acid in approved containers and handle it in a well-ventilated area to avoid inhaling fumes. In case of a spill, neutralize with a suitable base and dispose of waste according to local regulations.
How to do ionization using electron beam?
An electron beam fires electrons at an atomic structure, where the negative charge of the electron becomes electrostatically attracted to the positive charge of the protons in sn atom's nucleus. The electron begins orbiting the atomic nucleus on an energy level with other electrons, the total number of which determines the electrical charge of the resulting ion. Simply put, adding 1 electron to a neutrally charged particle (an atom) will add 1 negative charge to the overall structure. So, by firing electrons at an atom, you will only ever create positive ions.
The most common way to retrieve sperm is through masturbation into a sterile container at a healthcare facility. In some cases, sperm can also be obtained through surgical procedures or other medical interventions. It's best to consult with a healthcare provider for the most appropriate method in your specific situation.
Making a magnet is very simple. We need :
1. an iron nail or any other long iron object
2. a magnet
METHOD:
Rub the magnet on the iron nail in one direction. Then lift it and repeat the action . Repeat this series of action 30-50 times. the iron object will turn into a magnet. But it will not become a strong magnet
CAUTION: While rubbing the magnet with the iron object, we need to rub it with the same pole on one side
How to test for ethanoic acid in vinegar?
One way to test for ethanoic acid in vinegar is to use litmus paper or pH test strips to check the acidity level. Vinegar should give a pH reading lower than 7. Another method is to perform a titration with a standardized sodium hydroxide solution to determine the concentration of ethanoic acid in the vinegar sample.
5,30*3.6 = 19.08 km\h.
1 hour = 3600sec.(3,6)
To go from km\h to m\s, just divide by 3,6.
How to remove expanding foam from clothes?
Fully set expanding foam can be softened and removed quite easily! I made a terrible mess on my vinyl carpet and nice clothes (silly me!) and a friend of mine, a chemical engineer, gave me the following advice: Expanding foam that has fully set can be softened with paint stripper. Apply generously after scraping off excess and leave to work. It will soften after about an hour and should be able to be removed from clothes after four or five hours by washing, depending on the thickness, it might take longer. Yes, some materials do not take kindly to paint stripper, but if it is going to be thrown out anyway, might as well try. Works a treat!
When the foam has not yet set, acetone will work. But it is messy and will likely ruin your clothes anyway and make your washing machine very smelly. Best to scrape of as much as you can, let it set and then try paint stripper.
To convert frames per second (fps) to miles per hour (mph) in a video, you need to know the distance covered in one frame and the duration of the video in seconds. Once you have those values, you can use the formula: mph = (fps * distance per frame * 3600) / seconds in video. This will give you the speed in miles per hour.
How to wire GE 5KCP39KG motor?
To wire a GE 5KCP39KG motor, be sure to follow the wiring diagram provided by the manufacturer. Typically, there will be numbered terminals for the various wires to be connected. Make sure to secure the wires correctly based on the diagram to ensure proper functioning of the motor. If you are unsure, it's best to seek guidance from a professional electrician.
How to use the word infrasonic in a sentence?
Infrasonic signals, which can cause excessive driver excursion, and improves the speaker's response across the operating range.
How to calculate hydrogen electrode?
The standard hydrogen electrode potential (SHE) is defined as 0 V by convention. It serves as a reference point to measure the electrode potential of other half-reactions. It is not calculated but rather chosen as a reference point for comparison in electrochemical reactions.
How to prepare a solution of 250 mM of sucrose?
A 5% sucrose solution has 5 grams of sucrose in every 100 grams of solution. As 1mL of water has a mass of 1 gram, you should dissolve 5 grams of sucrose in 95 mL of water.
How to measure a Four beam balance?
To measure with a four-beam balance, first release the locking mechanism and adjust all the riders to the zero mark. Place the object to be measured on the weighing platform and move the largest rider until the beam comes to rest. Read the weight from each beam and add them together to get the total weight of the object.
