2 years ago

Which of the following is an example of a hardwood? A maple B spruce C pine D fir

Engineering

1 answer:

bearhunter [10]2 years ago

7 0

Answer:

A. Maple

Explanation:

Maple is a hardwood.

Hope that helps!

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Which of the following is a possible unit of ultimate tensile strength?

levacccp [35]

Answer:

Newton per square meter (N/m2)

Explanation:

Required

Unit of ultimate tensile strength

Ultimate tensile strength (U) is calculated using:

$U = \frac{Ultimate\ Force}{Area}$

The units of force is N (Newton) and the unit of Area is m^2

So, we have:

$U = \frac{N}{m^2}$

$U = N/m^2$

<em>Hence: (c) is correct</em>

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3 years ago

4.2 A vapor compression refrigeration machine uses 30kW of electric power to produce 50 tons of cooling. What is

stellarik [79]

Answer:

5.833

Explanation:

Coefficient of Perfomance (COP) is the ratio of refrigeration effect to power input.

$COP=\frac {RE}{P}$ where RE is refrigeration effect and P is power input

Here, the power input is given as 30 kW

We also know that 1 ton cooling is equivalent to 3.5 kW hence for 50 tons, RE=50*3.5=175 kW

Now the $COP=\frac {175}{30}=5.833$

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3 years ago

9. A vehicle is having routine maintenance performed.

dexar [7]

Answer: b

Explanation:

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An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of 175 kPa. Water is stirred b

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Answer:

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3 years ago

Does a food market have any rooms in particular? Also whats units?

makkiz [27]

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Explanation:

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