The composite material is composed of carbon fiber and epoxy resins. Now, density is an intensive unit. So, to approach this problem, let's assume there is 1 gram of composite material. Thus, mass carbon + mass epoxy = 1 g.
Volume of composite material = 1 g / 1.615 g/cm³ = 0.619 cm³
Volume of carbon fibers = x g / 1.74 g/cm³
Volume of epoxy resin = (1 - x) g / 1.21 g/cm³
a.) V of composite = V of carbon fibers + V of epoxy resin
0.619 = x/1.74 + (1-x)/1.21
Solve for x,
x = 0.824 g carbon fibers
1-x = 0.176 g epoxy resins
Vol % of carbon fibers = [(0.824/1.74) ÷ 0.619]*100 =<em> 76.5%</em>
b.) Weight % of epoxy = 0.176 g epoxy/1 g composite * 100 = <em>17.6%</em>
Weight % of carbon fibers = 0.824 g carbon/1 g composite * 100 = <em>82.4%</em>
Due to the transition from a cool environment to a warmer/hotter environment. It's the same with condensation on a glass of water, essentially. <span>Eyeglasses fog up when they are cooled below the dew point and encounter warm, moist air.</span>
Answer:
a. True
Explanation:
Hello there!
In this case, as Grignard reagents are widely used in organic-synthesis procedures, since they are compelling nucleophiles able to react with electrophiles such as carbonyl compounds (aldehydes, ketones, esters, carbon dioxide, etc) and epoxides; they are involved in the addition of new C-C bonds to an starting carbon chain; therefore, this statement is a. True.
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The correct answer is the fourth option. Plants perform photosynthesis during the day.<span> </span><span>Photosynthesis
is the process in plants to make their food. This involves the use carbon
dioxide to react with water and make sugar or glucose as the main product and
oxygen as a by-product.</span>
Answer:
48 mph
Explanation:
divide time by distance - 20/25 = .8 miles per minute, multiple by 60 to get mph
