Physics

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Silver is the metal that conducts heat the fastest. The thermal conductivity of silver is 420 W/ (m• K) or watts per meter degrees of Kelvin. Thermal conductivity measures the ability of heat or thermal energy to move through materials.

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  • What were the contributions of Archimedes to the field of physics?

    Q: What were the contributions of Archimedes to the field of physics?

    A: The first-century inventor and scientist Archimedes is remembered by physicists as the originator of the principles of mechanics, buoyancy, the lever and the pulley, according to Famousscientists.org. Perhaps his best-known contribution to physics is his discovery of the principle of displacement, which states that objects displace a volume of water equal to their own weight.
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  • What is the formula for tension in physics?

    Q: What is the formula for tension in physics?

    A: In physics, the tension on a suspended object said to be equal to the weight of the object plus or minus the mass of the object times the acceleration acting on it. In other words, this is the weight of the object plus or minus the force on it, depending on the direction in which the force is acting.
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  • Does light always travel at light speed?

    Q: Does light always travel at light speed?

    A: Light typically travels at 186,000 miles per second, but scientists have found a way to slow it down to 38 miles per hour. A team at the Rowland Institute for Science has found a new state of matter to help slow light down. Sodium atoms were cooled almost to absolute zero, which is 459.67 degrees Fahrenheit below zero. That’s lowest temperature theoretically possible. They then shot a laser through the extremely cold sodium atoms, which acted like “optical molasses” to slow down the beam of light.
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  • How are mass and weight related to each other?

    Q: How are mass and weight related to each other?

    A: Mass and weight are closely related because mass affects the weight of an object experiencing the effects of gravity. Weight is the measure of the force of gravity on an object's mass, while mass is the measure of how much matter there is in an object.
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  • Why does rubbing your hands together make them warmer?

    Q: Why does rubbing your hands together make them warmer?

    A: Friction causes the hands to warm up when rubbed together. The greater the amount of friction between two objects is, the more heat is generated.
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  • How does gravity affect humans?

    Q: How does gravity affect humans?

    A: Humans evolved with gravity, and gravity affects human physiology and general health. Studies show that weightlessness has a number of negative health effects. Finding ways to mitigate these dangers is essential for long-distance space travel.
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  • What are the parts and functions of a theodolite?

    Q: What are the parts and functions of a theodolite?

    A: A thedolite is an instrument used to measure horizontal and vertical distances using lenses and lines. They include several components, such as a telescope, a leveling mechanism, a tripod and a compass. Theodolites are used for surveying and construction to obtain precise readings of landforms so construction projects remain level and plumb with the ground.
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  • What are examples of noncontact forces?

    Q: What are examples of noncontact forces?

    A: Electricity, gravity and magnetism are all examples of non contact forces. A force is anything that can cause a physical change in an object.
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  • What is the difference between kinetic and potential energy?

    Q: What is the difference between kinetic and potential energy?

    A: Kinetic energy is contained in a moving object, while potential energy exists in a stored form. Potential energy can be changed into kinetic energy. Potential energy is ready for release, while kinetic energy is already doing work. The property of a body determines the type of energy it contains.
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  • What are some good lab experiments that explain centripetal force?

    Q: What are some good lab experiments that explain centripetal force?

    A: One good experiment that explains centripetal force is the spinning penny. A penny is put inside a balloon, and the balloon is filled with air. Then, the balloon is swirled around until the penny rolls around inside of the balloon. The penny continues to spin even after the swirling stops.
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  • How does a fulcrum work?

    Q: How does a fulcrum work?

    A: A fulcrum is the fixed support or pivot point for a lever, which is a simple machine used to overcome resistance. The lever is a stiff rod or bar, and the location of the fulcrum determines the class of the lever. Levers are useful to increase force, increase speed or change direction of a force, according to HowStuffWorks.
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  • What is the difference between an atomic bomb and a nuclear bomb?

    Q: What is the difference between an atomic bomb and a nuclear bomb?

    A: Although both atomic and nuclear bombs derive their immense power from reactions that take place in the nucleus of the atom, they do so in different ways. As the terms are most commonly used, an atomic bomb derives its energy from fission, or splitting atoms, while a nuclear device, or "H-bomb," is driven by fusion.
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  • What is the purpose of a windmill?

    Q: What is the purpose of a windmill?

    A: A windmill uses wind power to create rotational energy for the use in mills, pumps and presses. In the Netherlands, where windmills became important for local economies, they were used to make boards, paint, oil, paper and bread.
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  • What are the Laws of Attraction and Repulsion?

    Q: What are the Laws of Attraction and Repulsion?

    A: The Law of Attraction is the belief that a person's thoughts attract specific things, people and situations into his life. The Law of Repulsion is the belief that the more a person thinks about what he does not want, the more he attracts what he does want. According to SelfGrowth.com, both beliefs support the idea that what a person thinks about, negative or positive, can manifest into reality.
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  • Why does a bouncy ball bounce so high?

    Q: Why does a bouncy ball bounce so high?

    A: Bouncy balls bounce high because the material of the ball is extremely elastic and can convert the kinetic energy from the fall into potential energy and back again with very little loss in momentum. Bouncy balls are used in many physics classrooms because they aptly demonstrate conservation of momentum through a highly elastic collision.
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  • How does a switch work on a circuit?

    Q: How does a switch work on a circuit?

    A: A switch works by interrupting current flow around an electrical circuit. A basic switch is a binary device: it is either open (off) or closed (on). The simplest type of switch is one that comprises two metal strips that are brought into contact by a spring or some other form of actuating mechanism.
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  • What role does friction play in static electricity?

    Q: What role does friction play in static electricity?

    A: Static electricity is the build up and transfer of charges between insulators. Charges are built up in objects when they lose or gain electrons. To acquire a charge in static electricity, two neutral objects are rubbed together and the friction between the objects allows electrons to be transferred from one object to another.
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  • What is electric field intensity?

    Q: What is electric field intensity?

    A: Calculating electric field intensity requires the knowledge about the current charge level of the object that is making the electric field and the distance between that charged object and the measuring tool. Electric field intensity (or strength) is a vector quantity, which means it has direction as well as magnitude. The magnitude of this intensity comes from the way it is measured.
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  • What is a mechanical governor?

    Q: What is a mechanical governor?

    A: The mechanical governor in an engine uses flyweights and gears in the crankcase to sense the speed to detect changes in the load and increases or decreases the throttle accordingly. According to Briggs and Stratton, a governor is like a car's cruise control system, as it keeps the engine running at the same speed.
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  • What is the definition of input force?

    Q: What is the definition of input force?

    A: Input force is the initial force used to get a machine to begin working. Machines are designed to increase the input force for a larger output force.
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  • Why does wood float on water?

    Q: Why does wood float on water?

    A: Wood generally floats because it's less dense than the water it floats on. However, some woods are denser than water and will tend to sink.
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