1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mamaluj [8]
2 years ago
12

In 1859 two Frenchmen built the first machine-powered submarine. What powered the engine?

Engineering
1 answer:
elena-14-01-66 [18.8K]2 years ago
7 0
Answer: Compressed-air engine.

Explanation:

The submarine used a compressed-air engine, propelled by stored compressed air powering a reciprocating engine.

Hope this helps
You might be interested in
Water at 60°F passes through 0.75-in-internal diameter copper tubes at a rate of 1.2 lbm/s. Determine the pumping power per ft
Lelu [443]

Answer:

The pumping power per ft of pipe length required to maintain this flow at the specified rate 0.370 Watts

Explanation:

See calculation attached.

- First obtain the properties of water at 60⁰F. Density of water, dynamic viscosity, roughness value of copper tubing.

- Calculate the cross-sectional flow area.

- Calculate the average velocity of water in the copper tubes.

- Calculate the frictional factor for the copper tubing for turbulent flow using Colebrook equation.

- Calculate the pressure drop in the copper tubes.

- Then finally calculate the power required for pumping.

8 0
3 years ago
Explain how does optimism and open-minded can help engineers succeed at their jobs
Aleonysh [2.5K]

Answer:There is an idea floating around that being an optimist is good for you. In her book, ‘Smile or Die’, Barbara Ehrenreich traces the origins of this idea, from early religious eccentrics to modern day psychology and motivational gurus. Related notions are that self belief is important to achievement, that confidence is needed, and you get what you expect. I freely admit that there was a time when I also thought that expectations influenced results, and sometimes they do.

However, since then I have examined this much more closely and changed my views. I now realise that there are downsides to optimism too, and that optimism and pessimism are not the only options. If you are interested in exploring this in more detail, especially if you have been uncomfortable with the self-delusion that positive thinking usually involves, then this article may provide a clearer understanding of a reasonable alternative that works and makes sense.

What is the choice?

Research has fairly consistently shown two biases in our predictions about the net benefits of actions we plan to take: (1) on average our predictions are usually too high, and (2) when asked to give ranges for our predictions our ranges tend to be too narrow.

This gives a useful insight into some familiar mental outlooks that we might try to adopt:

Pessimism: Expecting unrealistically low net benefits from courses of action (i.e. poor results achieved, if at all, after a struggle), and being unrealistically sure that those poor benefits will be achieved.

Optimism: Expecting unrealistically high net benefits from courses of action (i.e. great results easily achieved), and being unrealistically sure that those great benefits will be achieved.

Both of these involve overly narrow predictions. If we correct that by being more open-minded then other possible outlooks emerge. The one I will focus on in this article is this:

Open-minded realism: Having a view of the results of courses of action that is not biased towards high or low net benefits, and is open to a range of possibilities in a way that is, again, rational and unbiased, rather than overly narrow.

Here's a picture that shows each of these outlooks. The horizontal axis represents the outcome of some course of action, ranging from terrible on the left to great on the right. The height of the graphs represents the person's belief that each level of outcome will occur. Pessimism is narrow and negative, represented by the red distribution. Optimism is narrow and positive, represented by the green distribution. Open-minded realism, represented by the black curve, is unbiased and more spread, reflecting an open mind about what might happen.

Explanation:

3 0
3 years ago
A circuit contains four 100 ohm resistors connected in series. If you test the circuit with a DMM you should read a total resist
olga nikolaevna [1]
C is the correct answer
8 0
3 years ago
It is common practice to tin plate electrical terminals to facilitate soldering. Why is it tin that is used?
Zielflug [23.3K]

Answer: Its materials are good reactors with electrical terminals and most times we go the easy way

Explanation:

4 0
3 years ago
12. A structural component is fabricated from an alloy that has a plane strain fracture toughness of It has been determined that
Artyom0805 [142]

Answer:

Q1 = 4.233 mm

Explanation:

3 0
3 years ago
Other questions:
  • Amorphous material is characterized by by a) organized crystalline structure; b) high hardness and ductility c)the chaotic arran
    6·1 answer
  • Hi my name is <br> i hate hugs
    9·2 answers
  • A cylindrical specimen of a hypothetical metal alloy is stressed in compression. If its original and final diameters are 30.00 a
    14·1 answer
  • Air at 105 kPa and 37° C flows upward through a6-cm-diameter inclined duct at a rate of 65 L/s. The duct diameter is then reduce
    12·1 answer
  • Two gears that are directly touching are called?
    7·1 answer
  • A four-lane divided multilane highway (two lanes in each direction) in rolling terrain has five access points per mile and 11-ft
    10·1 answer
  • An interior beam supports the floor of a classroom in a school building. The beam spans 26 ft. and the tributary width is 16 ft.
    11·1 answer
  • If a population has no predadors and plenty of available resources, how might that population change
    15·1 answer
  • A good visual lead is .... seconds from the front of the vehicle, focusing in the center of the path of travel. Searching 20 to
    10·1 answer
  • Please look at the picture for question.
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!