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FrozenT [24]
3 years ago
6

A heat engine does 210 J of work per cycle while exhausting 440 J of waste heat. Part A What is the engine's thermal efficiency?

Express your answer using two significant figures.
Engineering
1 answer:
Oxana [17]3 years ago
6 0

Answer:

The engine's thermal efficiency is 0.32

Explanation:

Thermal efficiency = work done ÷ quantity of heat supplied

Work done = 210 J

Quantity of heat supplied = work done + waste heat = 210 + 440 = 650 J

Thermal efficiency = 210 ÷ 650 = 0.32

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"Carbon 14 (C-14), a radioactive isotope of carbon, has a half-life of 5730 ± 40 years. Measuring the amount of this isotope lef
igor_vitrenko [27]

Answer:

The age of the bones is approximately 14172 years.

Explanation:

The age of the bones can be determinated using the following decay equation:

N_{(t)} = N_{0}e^{-\lambda t}   (1)

<u>Where:</u>

N(t): is the quantity of C-14 at time t

No: is the initial quantity of C-14  

λ: is the decay rate      

t: is the time

First, we need to find λ:

\lambda = \frac{ln(2)}{t_{1/2}}

<u>Where:</u>

t(1/2): is the half-life of C-14 = 5730 y

\lambda = \frac{ln(2)}{5730 y} = 1.21 \cdot 10^{-04} y^{-1}

Now, we can calculate the age of the bones by solving equation (1) for t:

t = \frac{-ln(\frac{N_{(t)}}{N_{0}})}{\lambda}

We know that the bones have lost 82% of the C-14 they originally contained, so:

N_{t} = (1 - 0.82)N_{0} = 0.18N_{0}

t = \frac{-ln(0.18)}{1.21 \cdot 10^{-04} y^{-1}}

t = 14172 y

Therefore, the age of the bones is approximately 14172 years.

I hope it helps you!

3 0
3 years ago
The primary difference between LEED Certification for Buildings and LEED Professional Certifications is that professionals can c
TEA [102]

Answer:false

Explanation:

8 0
3 years ago
In sleep, what does REM stand for?
sertanlavr [38]

Answer:

C

Rapid eye maneuver

Explanation:

during slumber, your eyes move quickly on different directions.

7 0
4 years ago
Calculate the diameter of pneumatic cylinder to drive a mechanism. The force exerted by the mechanism is 80 N. The return force
sashaice [31]

Answer:

14.27 mm

Explanation:

Force = 80 Newton

Pressure exerted = 5 bar = 5×10⁵ Pa

Pressure exerted = Force/Area

Area = Force/Pressure

Area=\frac{80}{500000}\\\Rightarrow Area=0.00016\ m^2

Area of the cylinder=πd²/4

\Rightarrow \frac{\pi}{4}d^2=0.00016\\\Rightarrow d^2=\frac{4\times 0.00016}{\pi}\\\Rightarrow d^2=0.0002037\\\Rightarrow d=0.01427\ m

Hence diameter of cylinder 14.27 mm

5 0
3 years ago
The simply supported beam in the Figure has a rectangular cross-section 150 mm wide and 240 mm high.
8_murik_8 [283]
Same question idea but different values... I hope I helped you... Don't forget to put a heart mark

4 0
3 years ago
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