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natta225 [31]
2 years ago
10

What additive keeps engines clean by preventing contaminants and deposits from collecting on surfaces?

Engineering
2 answers:
Vladimir [108]2 years ago
6 0

Answer:

b

Explanation:

b

lubasha [3.4K]2 years ago
5 0

Answer:

Dispersants are mainly found in engine oil with detergents to help keep engines clean and free of deposits.

Explanation:

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you have to think then go scratch and then calculate and the design  

Explanation:

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2 years ago
Very thin films are usually deposited under vacuum conditions to prevent contamination and ensure that atoms can fly directly fr
katrin [286]

Answer:

a. 9947 m

b. 99476 times

c. 2*10^11 molecules

Explanation:

a) To find the mean free path of the air molecules you use the following formula:

\lambda=\frac{RT}{\sqrt{2}\pi d^2N_AP}

R: ideal gas constant = 8.3144 Pam^3/mol K

P: pressure = 1.5*10^{-6} Pa

T: temperature = 300K

N_A: Avogadros' constant = 2.022*10^{23}molecules/mol

d: diameter of the particle = 0.25nm=0.25*10^-9m

By replacing all these values you obtain:

\lambda=\frac{(8.3144 Pa m^3/mol K)(300K)}{\sqrt{2}\pi (0.25*10^{-9}m)^2(6.02*10^{23})(1.5*10^{-6}Pa)}=9947.62m

b) If we assume that the molecule, at the average, is at the center of the chamber, the times the molecule will collide is:

n_{collision}=\frac{9947.62m}{0.05m}\approx198952\  times

c) By using the equation of the ideal gases you obtain:

PV=NRT\\\\N=\frac{PV}{RT}=\frac{(1.5*10^{-6}Pa)(\frac{4}{3}\pi(0.05m)^3)}{(8.3144Pa\ m^3/mol\ K)(300K)}=3.14*10^{-13}mol\\\\n=(3.14*10^{-13})(6.02*10^{23})\ molecules\approx2*10^{11}\ molecules

5 0
3 years ago
A barometer reads a height of 78 cmHg. Express this atmospheric pressure to:
Yakvenalex [24]

  • A barometer reads a height of 78 cmHg. Express this atmospheric pressure to \large\mathsf{\red{\underline{Pascal(pa)}}}
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kiruha [24]

Answer:

6.9

Explanation:

I had the same question lol your welcomr if itd not right in sorry

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2 years ago
2. What is an important aspect of the American free enterprise system that encourages people to
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Have a positive mindset and attitude
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