Math and Arithmetic
Waves Vibrations and Oscillations
Units of Measure
Atoms and Atomic Structure
Physics regards the physical aspects of the natural world. It includes topics that deal with forces on different bodies within the universe and phenomena that explain how the universe works.
Asked in Physics, Example Sentences
How do you use attenuation in a sentence?
After his heart transplant, he was given special medicine to prevent rejection, these drugs are to be taken daily in order for attenuation to take place and to attenuate the immune response and to keep the body from rejecting its new heart. Installing this new piece of equipment will let through the lower frequencies, therefore achieving attenuation. ...
Asked in Physics, Engineering
What device or instrument is used to measure air pressure?
There are several options depending on the type of air pressure being measured: In the 1800's ships used a weather glass - a simple barometer - to measure changes in air pressure. To measure atmospheric (ambient air) pressure, a barometer is used. (It may be either an aneroid or a mercury type of barometer.) For tires, it's a tire pressure gauge. In industrial processes and boilers the gauge is frequently called a manometer. For pressure vessels it is a Bourdon gauge. ...
What is the Example of digital quantity?
A digital quantity example is provided by any digital microprocessor display where a discrete number is provided and the actual value is an irrational number. Some examples are the computer display of the values of pi, the square root of 2, the quotient of 3/19, or any other irrational number. A computer basically works with the integers 0 and 1, so it is a "digital" machine (it cannot deal with 3/19, or pi, etc with perfect accuracy). ...
What is the speed of ultrasound waves in the air?
The 'normal' speed of sound is 340 m/s in dry air at room temperature and pressure. From your question, it appears we should differentiate the terms "ultrasonic" and "supersonic". Ultrasonic relates to sonic frequencies higher than 20 KHz, i.e. beyond audible range. For a given gas, the speed of sound is independent of the frequency of the sound measured and also independent of the density of the gas. Supersonic relates to a speed of an object greater than the normal speed of sound (340...
Asked in Physics
Which term describes the tendency of an object to resist a change in motion?
An object's tendency to resist a change in its state of motion is called inertia. This is the basis of Newton's Laws of Motion; "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.". The state of motion refers to the object's velocity, which is the the speed and direction. One quantifies inertia as the quantity of mass of an...
Which science is the most complex chemistry or biology or physics?
Biology is the most complex because it deals with living organisms and number of known organisms is more than two and a half million while un-described species are estimated up-to 30 million . each organism is different from other and has its peculiarities . Chemistry deals with matter, with 92 natural element and nearly thirty synthetic elements . Number of organic molecules is quite large but much less as compared to species. ...
Asked in Physics, Toothbrushes
What kind of a simple machine is a toothbrush?
A toothbrush is not a simple machine, it does not work on the principle of levers, effort, and load. It's not a machine at all in mathematical terms. A "machine" is that which performs "work", i.e. transfers or converts energy. You arm moving the toothbrush is a machine by this definition, however. ...
Asked in Science, Physics, Chemistry, Chemical Bonding
Why does water have a high and specific heat capacity?
First, we need to know a little bit about water. Water is a polar molecule because oxygen bears partial negative charge and hydrogen bears partial positive charge. This results in extensive hydrogen bonding in water molecules between slightly negative oxygens and slightly positive hydrogens. Second, we need to remember that temperature is another way of saying the average kinetic energy of particles - the higher the temperature, the faster they move, in the case of gases and liquids, or vibrate, in the case of...
Asked in Physics, Nuclear Physics, Particle Physics
Matter attracts other matter does antimatter will repel the antimatter?
Antimatter observes and obeys the same fundamental forces that matter does: gravity electromagnetism weak interactive strong interactive A positron, which is the anti-particle of the electron, for example, has the same mass as an electron and experiences the same attraction to all other matter (gravity) as an electron. That same positron is repelled by positively charged particles and attracted to negatively charged particles (electromagnetism)....
Asked in Physics, IQ, Stephen Hawking
What is Stephen Hawking's IQ?
Although Professor Hawking discounts the value of numerical IQ's, he admitted that his own is likely very high (it has been suggested as 160 or more). He also said that "People who boast about their IQ's are losers". (see link to 2004 interview) ---a possibly dramatized anecdote from Introducing Stephen Hawking (2006)--- Near the end of his term at Oxford and no doubt beginning to feel the effects of ALS, Hawking took a terrible fall down a staircase in the university hall. As...
Asked in Physics, Mechanics, Newtons Laws of Motion
What is the formula for calculating acceleration?
Acceleration There are a few. The most famous is a = F/m, where F is the net force applied to a mass, m. Acceleration is also the change in velocity, (Delta-V), divided by the change in time, (Delta-t). So, a = Δv/Δt. For example, if an object's velocity changes from 10 meters per second to 20 meters per second in five seconds, its acceleration is (20-10)/5 = 2 meters per second per second, or 2 meters per second squared (m/s2). For circular motion, centripetal acceleration...
Asked in Solid State Physics, Physics
What is dislocation density?
Dislocation density is the areal density of dislocations intersecting a plain, usually the free surface, given as number per cm2. It may also be the volume density of dislocation line segments, given as the total length of dislocations divided by the containing volume (also 1/cm2), but this is rarely used in semiconductor physics, and more frequently found in engineering. Dislocation density is typically measured by etching the free surface to form pits around the location at which the dislocation breeches the surface, and is...
What is mass divided by weight?
Answer #1: It's (1) divided by (the acceleration of gravity in the place where that mass has that weight): weight = mass x g (where g is the acceleration due to gravity) ⇒ mass/weight = mass/(mass x g) = 1/g On the earth, g ≈ 9.81 ms-2 ⇒ mass/weight ≈ 1/9.81 ms-2 ≈ 0.102 m-1s2 On the moon, g is approx 1/6 that of the earth, ⇒ mass/weight ≈ 6/9.81 ms-2 ≈ 0.612 m-1s2 If the questioner really meant weight divided by mass it gives the acceleration due to...
Asked in Physics, Quantum Mechanics
Why are leptons divided into families?
Leptons are divided into three families with 4 particles (2 particles, plus their two anti-particles) in each family. In the electron family we have the electron, positron, electron neutrino and electron anti-neutrino. Each family has a higher mass than the one before it so the tauon is heavier than the muon which is heavier than the electron. The physical reason for there being three families is completely unknown and will probably win you a Nobel prize if you can figure it out! ...
Asked in Science, Physics, Temperature
What instrument measures temperature?
Most commonly, a thermometer. Related Information: Thermometers are used to measure the increase or decrease in the temperature of a system as it gains or loses internal energy. An alcohol-in-glass thermometer has been the most common personal instrument used to measure temperature. Mercury thermometers are still around but are no longer offered for sale. Today, digital devices are available that scan the forehead or ear. Some other devices used to measure temperature are: Radiation pyrometer, for extremely high temperatures; Glass thermometer: mercury or alcohol; Thermocouple; Thermistor (thermal resistor) Bimetallic...
Why are light and heat not considered matter?
What i understand is that there is noting call "Light" or "Heat" its just the "Space",. "Space" created between sub atomic particles and atom we understand and call it "Light" and our eye recognizes it - and "Space" created between atom, molecules and cells we feel it and call it "Heat" - our cells / skin feels it IF "Light" is a "particle" or "wave" then you should not see the same star from just one feet away - your eye should...
Are quarks nucleons?
No, quarks are not nucleons. A nucleon is a term (in physics) that is given to either of the two component particles of an atomic nucleus: the proton and the neutron. Both protons and neutrons are composite particles from the family of hadrons, and hadrons are made up of quarks. ...
Asked in Physics
Who invented the law of displacement?
The mathematician Archimedes of Syracuse. The most common story (which was first told by Vitruvius but doesn't pop up in Archimedes' known works) goes that King Hiero II had a votive crown forged for a temple, and he supplied the pure gold the goldsmith was to use. However, when he got the crown, the King asked Archimedes to determine whether the goldsmith had used all of the gold supplied or substituted silver for some of the gold. Archimedes couldn't melt the crown...
What equation relates frequency and wavelength and speed of light?
(Frequency) x (Wavelength) = Speed of light. Note carefully that the "speed of light" in the equation above is the speed of light in the medium that the wavelength is measured in. In vacuum it will be the famous constant "c", but when light travels through any sort of material it's speed is slowed and its wavelength shortened by a factor called the refractive index of the medium. Because wavelength and speed are reduced by the same factor the equation still holds....
Asked in Physics, Psychology
Who is the world's first psychologist?
The Greek philosopher Aristotle can be regarded as being the world's first psychologist because he wrote a book called 'De Anima', about the soul, and the soul is part of the subject matter of the original meaning of the word 'psychology'. But conventionally Wilhelm Wundt, a German academic who was originally a physiologist, is regarded as the world's first psychologist because he created a psychological laboratory to which the subsequent development of psychology as a science can be traced back to the psychologists...