Answer:
Shiny metals such as copper, silver, and gold are often used for decorative arts, jewelry, and coins.
Strong metals such as iron and metal alloys such as stainless steel are used to build structures, ships, and vehicles including cars, trains, and trucks.
Some metals have specific qualities that dictate their use. For example, copper is a good choice for wiring because it is particularly good at conducting electricity. Tungsten is used for the filaments of light bulbs because it glows white-hot without melting.
Nonmetals are plentiful and useful. These are among the most commonly used:
Oxygen, a gas, is absolutely essential to human life. Not only do we breathe it and use it for medical purposes, but we also use it as an important element in combustion.
Sulfur is valued for its medical properties and as an important ingredient in many chemical solutions. Sulfuric acid is an important tool for industry, used in batteries and manufacturing.
Chlorine is a powerful disinfectant. It is used to purify water for drinking and fill swimming pools.
Explanation:
Answer:
Explanation:
The rate of conductive heat transfer in watts is:
q = (k/s) A ΔT
where k is the heat conductivity, s is the thickness, A is the area, and ΔT is the temperature difference.
a)
Given k = 52.4 W/m/K, s = 0.014 m, and ΔT = 350-140 = 210 K, we can find q/A:
q/A = (52.4 / 0.014) (210)
q/A = 786,000 W/m²
b)
Given that A = 0.42 m², we can find q:
q = (0.42 m²) (786,000 W/m²)
q = 330,120 W
A watt is a Joule per second. Convert to Joules per hour:
q = 330,120 J/s * 3600 s/hr
q = 1.19×10⁹ J/hr
c)
If we change k to 1.8 W/m/K:
q = (k/s) A ΔT
q = (1.8 / 0.014) (0.42) (210)
q = 11,340 J/s
q = 4.08×10⁷ J/hr
d)
If k is 52.4 W/m/K and s is 0.024 m:
q = (k/s) A ΔT
q = (52.4 / 0.024) (0.42) (210)
q = 192,570 J/s
q = 6.93×10⁸ J/hr
<span>Greek philosophers had a basic approach to studying the world. They like to question the world and incite debates but they never really bothered to gather any real information, just discussions. Due to this, many ideas about matters were put out to be discussed, but they were never resolved.</span>
Answer:
A generator turns rotary motion into electricity. It is basically the inverse of a motor. Generally a transformer changes one voltage into another based on the number of conductor windings on each side. There are two sets of windings called the “primary” and the “secondary”.
Explanation:
Answer: An object undergoing uniform circular motion is moving
Explanation:
