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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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2.<br> The most common way to identify size of pipe is by:
elena-14-01-66 [18.8K]

Answer:

The string method (which measures the pipe's circumference) is probably the best way to determine your pipe diameter size. The circumference is the distance it takes to go around the pipe once.

Explanation:

It measures the pipe's circumference and is probably the best way to determine your pipe diameter size. The circumference is the distance it takes to go around the pipe once.

5 0
2 years ago
An object is supported by a crane through a steel cable of 0.02m diameter. If the natural swinging of the equivalent pendulum is
devlian [24]

Answer:

22.90 × 10⁸ kg

Explanation:

Given:

Diameter, d = 0.02 m

ωₙ = 0.95 rad/sec

Time period, T = 0.35 sec

Now, we know

T= 2\pi\sqrt{\frac{L}{g}}

where, L is the length of the steel cable

g is the acceleration due to gravity

0.35= 2\pi\sqrt{\frac{L}{9.81}}

or

L = 0.0304 m

Now,

The stiffness, K is given as:

K = \frac{\textup{AE}}{\textup{L}}

Where, A is the area

E is the elastic modulus of the steel = 2 × 10¹¹ N/m²

or

K = \frac{\frac{\pi}{4}d^2\times2\times10^11}{0.0304}

or

K = 20.66 × 10⁸ N

Also,

Natural frequency, ωₙ = \sqrt{\frac{K}{m}}

or

mass, m = \sqrt{\frac{K}{\omega_n^2}}

or

mass, m = \sqrt{\frac{20.66\times10^8}{0.95^2}}

mass, m = 22.90 × 10⁸ kg

4 0
3 years ago
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?
Oxana [17]

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

6 0
3 years ago
Why is a crank-rocker mechanism more useful than a double-rocker mechanism?
klasskru [66]

Answer:

explained

Explanation:

Crank rocker mechanism is formed when the shorter link revolves and the others rock( oscilllates)

Whereas the double rocker mechanism is formed when both the side link rock and the others oscillate.

Crank rocker mechanism can be used to convert rotary motion into oscillatory motion.

8 0
3 years ago
Electrical pressure or “force”<br><br> A) current<br> B) resistance <br> C) voltage
MAXImum [283]

Answer:

The answer is c-voltage

5 0
3 years ago
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