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3 years ago

How does deformation by drawing of a semicrystalline polymer affect its tensile strength?

1 answer:

4 0

This effect is explained by increased chain entanglements at higher molecular weights. Increasing the degree of crystallinity of a semicrystalline polymer leads to an enhancement of the tensile strength. Deformation by drawing increases the tensile strength of a semicrystalline polymer.

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How much of the electromagnetic spectrum is visible light?

Margarita [4]

I believe the answer is D, only a small part of it

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3 years ago

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A 1420-kg car is traveling with a speed of 12.4 m/s. What is the magnitude of the horizontal net force that is required to bring

zzz [600]

Answer:

1419.01436 N

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

$v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{0^2-12.4^2}{2\times 78}\\\Rightarrow a=-0.98564\ m/s^2$

The force on the car

$F=ma\\\Rightarrow F=1420\times -0.98564\\\Rightarrow F=-1419.01436\ N$

Magnitude of the horizontal net force that is required to bring the car to a halt is 1419.01436 N

3 0

3 years ago

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I just need some help with these im really struggling with these.

Nadusha1986 [10]

Answer: I can't help you with the first part but maybe this will help on the second part-

Light behaves as a wave - it undergoes reflection, refraction, and diffraction just like any wave would. Yet there is still more reason to believe in the wavelike nature of light. Continue with Lesson 1 to learn about more behaviors that could never be explained by a strictly particle-view of light.

Sorry couldn't do better

Explanation:

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3 years ago

Assume that the complete combustion of one mole of ethanol to carbon dioxide and water liberates 1370 kJ of energy (Δ????°′=−137

Nikitich [7]

Answer:

28 moles of X.

Explanation:

Let's consider the complete combustion of ethanol.

C₂H₆O(l) + 3 O₂(g) ⇒ 2 CO₂(g) + 3 H₂O(l)

When 1 mole of ethanol burns it releases 1370 kJ, that is, the enthalpy of combustion is -1370 kJ/mol. If the energy released by one mole of etanol were used to syntesize the compound X, it would take 45.9 kJ to form 1 mole of X, that is, the enthalpy of formation is -49.5 kJ/mol. Then,

$1mol(etanhol).\frac{-1370kJ}{mol(etanhol)} .\frac{1mol(X)}{-49.5kJ} =28mol(X)$

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4 years ago

What do velocity and acceleration have in common?

Allushta [10]

Acceleration is the change in velocity

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4 years ago

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