Technology

The work done by the elevator motor to lift the 1000 kg elevator a height of 100 m is 1000 kg * 9.8 m/s^2 * 100 m = 980,000 J. The power required to do this in 50 s at constant speed is 980,000 J / 50 s = 19,600 W or 19.6 kW.

The angle of internal friction is a measure of the resistance of a material to shear stress. It represents the maximum angle at which a material can be stable without collapsing or flowing. It is an important parameter in geotechnical engineering for analyzing soil behavior under different loading conditions.

The length of a 5.25" floppy or drive bay.

They keep us on time and help us communicate commands and directions more clearly. For example, if Bob tells you to meet at the park at 2:30 and there are no clocks around you within a 100-mile radius, then you're pretty much screwed.

Commutating field windings are connected in series with the armature windings so that the current flowing in the coils is always equal to the armature current. The number of turns in the commutating field windings are also equal to the number of armature turns. This means that the field strength of the commutating windings and the field strength of the armature are always equal. A DC motor is constructed so that these two fields of equal strength oppose one another, they therefore cancel one another out. The main field is now unaffected by armature reaction.

Greenhouse gases are primarily caused by human activities such as burning fossil fuels, deforestation, industrial processes, and agricultural practices. These activities release gases like carbon dioxide, methane, and nitrous oxide into the atmosphere, trapping heat and contributing to global warming.

Mass is the amount of matter in an object, measured in kilograms, and is constant regardless of location. Weight is the force of gravity acting on an object's mass, measured in newtons, and can change depending on the gravitational pull of the location. While mass remains constant, weight can vary depending on the gravitational field strength.

Microwavesare radio waves with wavelengths ranging from as long as one meter to as short as one millimetre, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz.[1] This broad definition includes both UHFand EHF (millimeter waves), and various sources use different boundaries.[2] In all cases, microwave includes the entire SHF band (3 to 30 GHz, or 10 to 1 cm) at minimum, with RF engineering often putting the lower boundary at 1 GHz (30 cm), and the upper around 100 GHz (3 mm).

Trypan blue dye is composed of a synthetic organic compound that contains sulfur and carbon atoms. It appears as dark blue crystals or powder and is commonly used in biological research and medicine to stain dead cells.

The advantage of the pendulum clock over water-clocks and sand-glasses was its greater accuracy and precision in timekeeping. The swinging motion of the pendulum ensured consistent and reliable time measurements, making it a significant advancement in timekeeping technology.

Gyratory motion is a type of motion where an object or a point within the object moves in a circular path around a central axis. It is characterized by a combination of rotational and orbital movement. This motion is often seen in machines like gyratory crushers or in celestial bodies like planets and moons.

Gigahertz is important because it represents the clock speed of a processor, indicating how many cycles the processor can execute in one second. A higher gigahertz value generally means the processor can perform tasks more quickly, making it suitable for demanding applications like gaming or video editing. However, other factors like the number of cores and architecture also play a role in determining overall performance.

Mass means the matter contains in a body but weight means the gravitational pull exerts on a body in weight. We consider both matter and gravitational pull.

Comparing Mass and Weight

Weight W = force F = mass m times acceleration of gravity g.

On Earth the difference between weight and mass is more philosophical than practical.

Mechanical quantities can be defined in terms of mass, length and time. The SI unit of mass is the kilogram.

The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = m times g. The SI unit of weight is the newton.

Density is mass divided by volume.

A conversion factor is a numerical factor describing the proportionality between two units.

For example 0.45359237 is the conversion factor from pounds to kilograms. That is 0.45359237 kg/lb.

If the conversion factor kg/lb is multiplied with 4 lb, you get the same mass value in kg.

There is no specific, 'better' one. People of the early 1900's had just begun to develop electricity and technology. All of the years before that were not at all involved in electricity. Think about not having lights, a nice home, cooked food from a stove, or even your cell phone. People took baths in lakes, lived in huts or often sod houses, which were made of stone, and mud, and they used a flame to see around in the dark. So, you are more able to choose for yourself then me because you know what you like more.

The speed of sound in fresh water is approximately 1482 meters per second at a temperature of 25 degrees Celsius. This value may vary slightly based on the temperature, salinity, and pressure of the water.

Centripetal force increases with an increase in the speed or radius of the circular motion. It is inversely proportional to the radius of the circle and directly proportional to the square of the velocity. Generally, any factor that increases the velocity or decreases the radius will increase the centripetal force.

Plastic is a polymer of hydrocarbon monomers, and is used frequently in everyday life as polythene bags, containers, cutting boards, appliances, etc. From our toothbrushes, to hairbrushes (and combs), to scrubbing brushes, to car wash brushes (and the cars we sit in), plastics form all or part of the products we use. From Tupperware or ZipLock bowls, to cat and dog water or food bowls, to bowling pins (especially children's), to plastic bats, to decorating with fake bats and Halloween objects, plastics contribute useful products. Whether we buy plastic flowers or a hose to water real flowers, plastics add to the life's beauty as well as functionality. Even clothing and outerwear can have portions made with polymers of plastics; we'd be drenched and miserable without raincoats and umbrellas. Other than food, challenge yourself to find everyday products that don't use plastics either within the product or as covering made to sell the product.

In the laboratory, copper(I) Iodide is prepared by simply mixing an aqueous solutions of potassium iodide and a soluble copper(II) salt such copper sulphate. : :: Cu2+ + 2I− → CuI2 The CuI2 immediately decomposes to iodine and insoluble copper(I) iodide, releasing I2. : :: 2 CuI2 → 2 CuI + I2

The resolution of a ruler refers to the smallest measurement increment that can be accurately read or measured using the ruler. It is typically determined by the smallest division marked on the ruler, such as millimeters or fractions of an inch.

Anywhere offering degrees in physics, astrophysics, or related fields (which is nearly every university). Contrary to popular belief, you don't need to go to an Ivy League school or be valedictorian.

Abstract of the Disclosure A method for the electrolytic production of metal, includes electrolyzing, between anodic and cathodic surface areas, a compound of the metal dissolved in a molten solvent, the electrolyzing being performed at a temperature such that the metal is formed in the molten state, the metal collecting in a molten metal pad, wherein the improvement includes the provision of cathodic surface area in the form of an array of elements protruding out of the pad into the melt toward the anodic surface area for establishing a series of locations at which the anode-cathode distance is up to 1-1/4 inches

ceiling fans only push the air around them, they have no cooling fuctionality. Ceiling fans don't have any way of cooling the air they circulate, but that is also true of fans placed on work desks or floor stands. However the human body feels more comfortable if the skin feels cool, and fans help to do this by evaporating more moisture from the skin, due to the flow of air over it. However there are certain aspects that should be taken into consideration; 1-that energy transfer takes time, and when air moves it does not transfer its heat to the body because the time of transference decreases, for example if you holds a hot cup of tea you will get burned, but if you touched it quickly you won't be burned.

2-Also if the temperature is low and you are covered by a blanket you will the air inside that blanket and you will be warm, accordingly if there is a fan the air won't stay around your body to be warmed. 3-Finally when air circulates this will increase the amount of air inside the room thus more air will absorb more heat from your body(if the air's temperature is less than the body' temp) until the thermal equilibrium occures. If there is no one in the room to feel the moving air then there is no effect other than wasting electricity to run the fan. Window fans on exhaust or intake do have a cooling or warming effect depending on the outside air.

The best conductors of electricity are superconductors; these offer zero resistance.

Many materials will superconduct when sufficiently cooled - most superconductors need to be cooled to within a few degrees of absolute zero, metals including tin and aluminum will superconduct. Somewhat ironically, gold will not superconduct - gold is a very good conductor at room temperatures.

In 1986, some ceramic based materials were found to superconduct at high temperatures - still around -90oC, so not all that high - but making the effect much more useful as liquid nitrogen can be used to cool the materials.

The simple answer to the best METAL conductor. Silver.