“Physics Interview Questions and Answers will guide you that Physics is a natural science. Physics is the study of matter and its motion through spacetime and all that derives from these, such as energy and force. Learn the basic and advance concepts of Physics and get preparation of Physics Job Interview by our Physics Interview Questions and Answers.”
For the same leg strength / jumping technique, weight affects how far one can jump.
Acceleration = Force / Mass
With more mass, you cannot accelerate yourself as much when you jump with the same force. Imagine trying to jump with a small backpack full of sand strapped to your back. Your strength hasn't changed. That is, the amount of force you can deliver hasn't changed, but your mass has. You can't jump as high.
All air travel takes the earth's rotation into account. Flights from east to west take less time in absolute terms, having nothing to do with time zones. The reverse is true with west to east flights, and even north-south flights must calculate the amount of rotational deviance while the aircraft is in flight. Long range naval cannons have been computing the earth's rotation under the projectile in aiming calculations for more than a century. Satellites in synchronous orbit that appear stationary are actually traveling at the earth's rate of rotation.
60 revolutions per minute is one revolution per second.
1 light second is the distance light travels in one second.
What this means is that points on this hypothetical disk's perimeter would need to travel at the speed of light to satisfy your conditions. This cannot happen for anything that has mass.
Bottom line: a disk this size could not spin at this speed.
Machines which are used to lift a load are governed by the "Law of machines", which states that the effort to be applied on the machine (p) is related to the weight (w) which it can lift as -
p = mw + c
Where m and c are positive constants which are characteristics of the machine.
Density is a physical characteristic, and is a measure of mass per unit of volume of a material or substance. It is a measurement of the amount of matter in a given volume of something.
The higher an object's density, the higher it’s mass per unit of volume. The average density of an object equals its total mass divided by its total volume. A denser object (such as iron) will have less volume than an equal mass of some less dense substance (such as water).
An alloy is a homogeneous hybrid of two or more elements, at least one of which is a metal, and where the resulting material has metallic properties. The resulting metallic substance often have unexpected characteristics.
Classification of Alloys
Alloys can be classified by the number of their constituents. An alloy with two components is called a binary alloy; one with three is a ternary alloy, and so forth. Alloys can be further classified as either substitution alloys or interstitial alloys, depending on their method of formation. In substitution alloys, the atoms of the components are approximately the same size and the various atoms are simply substituted for one another in the crystal structure. An example of a (binary) substitution alloy is brass, made up of copper and zinc. Interstitial alloys occur when the atoms of one component are substantially smaller than the other and the smaller atoms fit into the spaces (interstices) between the larger atoms.
An alloy is a metal mixed with another metal to make it stronger.
Free Electron Theory:
This theory tells that, metals conduct electricity because of the presence of free electrons in it. The outermost shells of metal atoms will be loosely bound with their nucleus. So the electrons in it are free to move anywhere in the solid. These electrons are called free electrons and they are responsible for the conduction of electricity.
If the outward pressure inside your body were not equal to the pressure pressing in on you, you would be crushed faster than an empty aluminum beer can at a frat party.
Find an old empty gallon can, a squarish one that paint thinner or turpentine comes in. Make sure its empty! Put an ounce or two of water in it. Put the can on the stove and heat it up until the water boils. Do this with the cap off!!! When the water boils, it will produce steam. When you see the steam coming out the top, screw the cap on. Don't burn yourself; use mitts. Let it cook for a few more seconds, not too long, though. Then, using oven mitts grab the can by the handle and quickly place it in the sink and run cold water over it. Watch what happens. Keep your hands away from it, though. You don't want to get pinched.
What happened? Well, when you quenched the can in the sink, the steam that had been filling the volume inside the can condensed, creating a vacuum -- an empty space -- inside the can. That created a low pressure in there. In other words, the pressure inside the can was much less then the pressure outside the can, creating a large pressure differential, causing the can to implode.
well this is simple i may be young and not know a lot but the fluids inside your body exert an equal amount of force all around you, thus acting on the atmospheric pressure and neutralizing the effect (some of this may not be correct)
It'll produce voltage if you spin it forwards, too. The only difference between a DC motor and a DC generator is what you use it for.
A long time ago, cars had DC generators on them instead of AC alternators. When you replaced a generator, you had to "polarize" it so it would make electricity. You hooked it up to your battery and let it run, as a motor, for a few seconds. Don't try that with an alternator because you'll break it.
If you're looking for a neat little elementary-school science project, you can use little Radio Shack electric motors as generators for things like windmills, water wheels, dynamos turned by bicycle tires...
1. A body at rest will remain at rest and one in motion will remain in motion, until and unless acted upon by an external force. (Law of inertia)
2. The rate of change of momentum of a body is proportional to the resultant force acting on the body in the same direction as its motion. (F = ma)
3. For every action there is an equal an opposite reaction.
Note: These laws apply only at speeds not approaching the speed of light and do not apply to sub-atomic particles.
You can rub a magnet along the metal in one direction for a bunch of times (the more the better), and that will magnetize it to some degree, but it’s not permanent and will demagnetize if it is hit hard with something.
Also, to magnetize something like a nail, if you point one end north, and hit the other end with a hammer it should weakly magnetize it. Unfortunately it doesn't work every time.
Links are provided to Wikipedia and a couple of other sources.
An atom of an element that has a different number of neutrons in its nucleus to other atoms of the element
Water contracts as it cools, like all other liquids, until it reaches a temperature of about 4 degrees Celsius, at which point it expands and begins to form into crystals, expanding approximately 9 percent.
When a text or image is entered into the CPU, it produces a series of varying voltages. This controls a LED (light emitting diode) in the printer. This emits flashes of laser, when it falls on a charged photo conducting drum. The area corresponds the text or image will either be neutralized or oppositely charged. A toner which has the same charge as the background is sprayed onto it. It only sticks to the text or image and is repelled by the background. A fresh paper is now pressed onto the toner and is slightly heated so that it sticks firmly on the paper....
Parallel forces are two or more forces which act in parallel. The forces do not have to be in the same direction however.
Atomic theory is about structure of an atom, i.e., its composition. Like an atom in general is made up of number of protons, neutrons residing in nucleus and electrons orbiting around the nucleus. However, kinetic theory deals with the manifestations of gases as molecules assuming that the volume occupied by molecules is negligible compared to the domain and the intermolecular force between molecules is also insignificant. Also assuming that there is a perfectly elastic collision between molecules and between molecules and wall, various macroscopic properties like pressure, temperature, enthalpy etc are derived. For example pressure exerted by gas on chamber walls can be derived by computing the momentum exchange of molecules with the wall. Thus apparently there is no similarity between the two above-mentioned theories.
The fundamental branches of physics are classical mechanics, electromagnetism (including optics), relativity, thermodynamics, and quantum mechanics.
How was the length of a standard meter redefined in the year 1983?
Since 1983 the meter has been defined as the distance light travels in a vacuum in exactly 1⁄299,792,458th of a second
In short, the universe is expanding. All of the galaxies we have observed that are farthest away are moving away from us. And the farther away they are, the faster they are moving away. It took little imagination to "rewind" that picture and see a time when all of the matter and energy of the universe was basically "in one place" and there was no universe. With all the energy (matter could not have existed as we know it in an energy field so intense) in that one place after arriving or being created, a huge explosion, the Big Bang, created space-time.
The energy dispersed and, as things cooled down, matter began to form. It's the expanding universe that is the evidence for the Big Bang. That and the microwave background radiation that was discovered in the 1960's (and found to be everywhere) that is convincing. Here's an analogy (though not necessarily the best one) for the microwave background radiation. Imagine a cannon shell exploding in the air. After a few seconds, the blast is "all gone" but there is a cloud of smoke everywhere. The microwave background radiation is like the "leftover smoke" of the high (very, very, very high) energy event that was the blast of the Big Bang.
A piece of crystal stemware has a natural or resonant frequency that can be excited by rubbing a moistened finger along its rim. Filling the glass with water merely changes the pitch of the tone. The tone you hear is created when the crystal vibrates at frequencies in the audible range for humans. Although it's difficult to see, the glass actually flexes during the vibrations. If the glass deforms sufficiently, it can break, since crystal is brittle and not very elastic. It is not likely that a flawless glass could be made to break merely by rubbing its rim.
The Myth Busters demonstrated the resonance of a crystal glass and shattered several by exciting the glasses with a human voice. One professional singer broke a glass without the use of amplification. See the video.
It is a science where the earth is the center of the solar system and the other planets and the sun revolve around the earth. However, most scientists say that we have the Heliocentric Model which (Helios) which means sun says that the sun is the center of the solar system and the planets revolve around the sun.
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