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3 years ago

Need help with these 3 questions pls help

Engineering

1 answer:

Burka [1]3 years ago

8 0

Answer:

Explanation:

First one is passion i think

second one is true im not sure

Third one is Time managaemant

Hope this helps!

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By increasing the cross-sectional area of the restriction, one can significantly increase the flow velocity. a) True b) False

natka813 [3]

Answer:

b)false

Explanation:

As we know that

Volume flow rate Q

Q = A x V

For constant volume flow rate,if velocity will increase then automatically area will decrease and vice versa.

Generally nozzle are used to increase the velocity and diffuser are used to decrease the exit velocity of flow.

So by increasing the cross sectional area of the restriction ,the velocity of the flow will decrease.

8 0

3 years ago

A stainless steel ball (=8055 kg/m3, Cp= 480 J/kgK) of diameter D =15 cm is removed from theoven at a uniform temperature of 3

aleksandrvk [35]

Answer:

i) 25.04 W/m^2 .k

ii) 23.82 minutes = 1429.2 secs

Explanation:

Given data:

Diameter of steel ball = 15 cm

uniform temperature = 350°C

p = 8055 kg/m^3

Cp = 480 J/kg.k

surface temp of ball drops to 250°C

average surface temperature = ( 350 + 250 ) / 2 = 300°C

i) Determine the average convection heat transfer coefficient during the cooling process

Note : Obtain the properties of air at 1 atm at average film temp of 30°C from the table " properties of air " contained in your textbook

average convection heat transfer coefficient = 25.04 W/m^2 .k

ii) Determine how long this process has taken

Time taken by the process = 23.82 minutes = 1429.2 seconds

Δt = Qtotal / Qavg = 683232 / 477.92 = 1429.59 secs

attached below is the detailed solution of the given question

3 0

3 years ago

The speed of sound is 1150 ft/s convert to mile/h

Sonbull [250]

Answer:

784.090909mph

Explanation:

1ft/s=0.681818 mph

1150ft/s=0.681818 x 1150=784.090909

6 0

3 years ago

BAGAIMANA CARA MENINGKATKAN PRODUKTIVITAS ? APA SAJA VARIABEL

morpeh [17]

Answer:

;-;

Explanation:

am i dyslexic or is this another language

5 0

3 years ago

Read 2 more answers

By using a book of the OHS Act, Act 85 of 1993, find the act or regulation where the following extraction comes from "every empl

AnnyKZ [126]

Answer:

Is very important to employ safety and care

For every staff

Is very necessary is protected

Her is going very high stage

Because of every one say that this company is best for others company

Is reason safety is very important in our life

3 0

3 years ago