Should I take physics or biology?

We reduce friction in machines? why<br>

kvv77 [185]

Answer:

friction reduces the efficiency of machines, thus we must reduce the friction force that is acting upon it.

5 0

3 years ago

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A batch of 75 parts is to be nickel-plated in a barrel plating operation. The parts are identical, each with a surface area A =

mojhsa [17]

To solve this problem it is necessary to take into account the concepts related to electrochemical Machining Processes and metal removal. Metal removal rate is determined by Faraday's First law, which states that the amount of chemical change Produced by an electric current is proportional to the quantity of electricity passed, i.e,

$V = CIt$

Where,

V = Volume of material removed

C = Constant called the specific removal rate that depends on atomic weight (I attached a table with this values)

I = Current

t = time

Since we also have to consider the efficiency of the system to remove the Volume, of all the volume removed, only 95% will be efficient.

From our values we have to

$A = 5.3in^2$

$I = 120A$

$t = 20 min$

$C = 1.25*10^{-4} in^3/A-min$

$\eta = 95%$

Calculating the value we have that,

$V = (1.25*10^{-4})(120)(20)$

$V = 0.3in^3$

$V_{net} = 95\% *0.3$

$V_{net} = 0.285in^3$

The area is simply the calculation of the total units by that of each piece, that is

$A = 75*5.3$

$A = 397.5in^2$

Therefore we can calculate now the plating thickness through the ratio between Volume and Area

$d = \frac{V}{A}$

$d = \frac{0.285}{397.5}$

$d = 0.000716in$

Therefore the average plating thickness on the parts is 0.000716in

7 0

3 years ago

If you were to build a pipe organ with open-tube pipes spanning the range from 25 hz to 19 khz. The speed of sound in air is 343

Dennis_Churaev [7]

The length of the shortest pipe which is l2 will be 0.018m

<h3>What is Length?</h3>

This is defined as the measurement or extent of a substance from end to end. The formula is shown below:

L = v/f where v is speed , f is frequency

f1 = 25hz , f2 = 19khz

The length for both sides is seen below:

l1 = 343/25 = 13.72m

l2 = 343/19000 = 0.018m.

The length of the shortest pipe is therefore 0.018m.

Read more about Length here brainly.com/question/24259483

3 0

2 years ago

What happens during nuclear fission?

erica [24]

Answer:

During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation. More neutrons are also released when a uranium atom splits. These neutrons continue to collide with other uranium atoms, and the process repeats itself over and over again.

Explanation:

In nuclear fission the nucleus of an atom breaks up into two lighter nuclei. The process may take place spontaneously in some cases or may be induced by the excitation of the nucleus with a variety of particles (e.g., neutrons, protons, deuterons, or alpha particles) or with electromagnetic radiation in the form of gamma rays. In the fission process, a large quantity of energy is released, radioactive products are formed, and several neutrons are emitted. These neutrons can induce fission in a nearby nucleus of fissionable material and release more neutrons that can repeat the sequence, causing a chain reaction in which a large number of nuclei undergo fission and an enormous amount of energy is released. If controlled in a nuclear reactor, such a chain reaction can provide power for society’s benefit. If uncontrolled, as in the case of the so-called atomic bomb, it can lead to an explosion of awesome destructive force.