Select the correct answer from each drop-down menu.

Air flows steadily through a variable sized duct in a heat transfer experiment with a speed of u = 20 – 2x, where x is the dista

zysi [14]

Answer:

a) $a=-28m/s^{2}$

b) $\frac{dT}{dx}=-5 ^{o}C/m$

Explanation:

a)

In order to solve this problem, we need to start by remembering how the acceleration is related to the velocity of a particle. We have the following relation:

$a=\frac{dv}{dt}$

in other words, the acceleration is defined to be the derivative of the velocity function with respect to time. So let's take our speed function:

u=20-2x

if we take its derivative we get:

du=-2dx

this is the same as writting:

$\frac{du}{dt}=-2\frac{dx}{dt}$

we also know that velocity is defined to be:

$u=\frac{dx}{dt}$

so we get that:

a=-2u

when substituting we get that:

a=-2(20-2x)

when expanding we get:

a=-40+4x

and now we can use this equation to find our acceleration at x=3, so:

a=-40+4(3)

a=-40+12

$a=-28 m/s^{2}$

b)

the same applies to this problem with the difference that this will be the rate of change of the temperature per m. So we proceed and take the derivative of the temperature function:

T=200-5x

$\frac{dT}{dx}=-5$

so the rate of change is $-5^{o}C/m$

7 0

3 years ago

1. (16 points) True or False, one point each, Write down F (false) or T (true). ___ (01) In a mechanical design, it is recommend

nikitadnepr [17]

Answer:

True

Explanation:

I looked it up

3 0

4 years ago

What is the first step necessary for initiating the visual transduction cascade in rods?.

irinina [24]

'Capturing a photon by<em> isomerization and rhodopsin </em>of retinal' is the first step necessary for initiating the visual transduction cascade in rods.

Visual transduction refers to the process in the eye where absorption of light in the 'retina' is translated into electrical signals that then reach the brain. It is correct to state that visual transduction is the photochemical reaction that takes place when light or photon is converted to an electric signal in the retina. The visual pigment in the rods, called rhodopsin, is a membrane protein placed in the outer segments of the rods.

When initiating the visual transduction cascade in rods the first vital step is to capture a photon by<em> isomerization and rhodopsin</em> of retinal'.

You can leran more about visual transduction at

brainly.com/question/13798113

#SPJ4

4 0

1 year ago

Which of the following allows team members to visualize a design model from a variety of perspectives?

julsineya [31]

Answer: from what i know im pretty sure its isometrics or sketches im certain its sketches but not 100%

Explanation: A sketch is a rapidly executed freehand drawing that is not usually intended as a finished work. A sketch may serve a number of purposes: it might record something that the artist sees, it might record

8 0

3 years ago

Read 2 more answers

Marcus wants to pursue a career in civil engineering. He aims to work for the city council as a civil engineer. What examination

Rzqust [24]

Answer:

Marcus would have to take an exam administered by the national council of examiners for engineering and surveying.

Explanation:

Civil engineers design, construct, and maintain projects regarding infrastructure. A civil engineer also looks after the systems in the public and private sectors like roads, buildings, and systems for water supply and sewage treatment.

In order to pursue a career in civil engineering, Marcus aims to work for the city council as a civil engineer. Therefore, he would have to take an exam administered by the national council of examiners for engineering and surveying.

6 0

3 years ago