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3 years ago

15

Which of these physical concepts is most important in civil engineering? A. energy transformations B. motion under gravity C. he

at transfer D. forces in structures E. atomic structure

1 answer:

melamori03 [73]3 years ago

7 0

Answer:

energy transformations

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Determine (with justification) whether the following systems are (i) memoryless, (ii) causal, (iii) invertible, (iv) stable, and

lina2011 [118]

Answer:

a.

y[n] = x[n] x[n-1] x[n+1]

(i) Memory-less - It is not memory-less because the given system is depend on past or future values.

(ii) Causal - It is non-casual because the present value of output depend on the future value of input.

(iii) Invertible - It is invertible and the inverse of the given system is $\frac{1}{x[n] . x[n-1] x[n+1]}$

(iv) Stable - It is stable because for all the bounded input, output is bounded.

(v) Time invariant - It is not time invariant because the system is multiplying with a time varying function.

b.

y[n] = cos(x[n])

(i) Memory-less - It is memory-less because the given system is not depend on past or future values.

(ii) Causal - It is casual because the present value of output does not depend on the future value of input.

(iii) Invertible - It is not invertible because two or more than two input values can generate same output values .

For example - for x[n] = 0 , y[n] = cos(0) = 1

for x[n] = 2 $\pi$ , y[n] = cos(2 $\pi$ ) = 1

(iv) Stable - It is stable because for all the bounded input, output is bounded.

(v) Time invariant - It is time invariant because the system is not multiplying with a time varying function.

3 0

3 years ago

Write a SELECT statement that returns the same result set as this SELECT statement, but don’t use a join. Instead, use a subquer

Bess [88]

Answer:

See explanation

Explanation:

The complete question is

Write a SELECT statement that returns the same result set as this SELECT statement, but don't use a

join. Instead, use a subquery in a WHERE clause that uses the IN keyword.

SELECT DISTINCT category_name

FROM categories c JOIN products p

ON c.category_id = p.category_id

ORDER BY category_name

The join clause gives us all the registers of both tables, for which the category_id of categories coincides to the category_id in the table products. That is, we can first select the distinct category_id's from products and the see the categories from categories table, whose id is in that list. That means writing the following query:

Select distinct category_name

from categories c

where c.category_id in (

select distinct p.category_id

from products p)

order by category_name

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4 years ago

HELP I NEED HELP!!!111!11!111 WILL GIVE BRAINLIEST AND 69 POINTS

Dafna1 [17]

It would be Animals break down food molecules to obtain energy, the remains of producers are broken down by decomposers, and producers make sugar and starches.
A, B, and E.

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3 years ago

According to the basic speed law, if conditions make it unsafe to follow posted speed limits, you should:____.

lapo4ka [179]

According to the basic speed law, if conditions make it unsafe to follow posted speed limits, you should: Reduce your speed to less than the maximum posted speed limit.

<h3>What is the most speed limit?</h3>

The highest published speed limit in the country is 85 mph (137 km/h) and can be located only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic.

<h3>What is the 'rule'? </h3>

The 'rule' itself is quite straightforward: if the speed limit is (for example) 30mph, the rule notes that you won't get a speeding ticket unless you are going 10% plus 2 mph faster than the limit.

To learn more about speed limit, refer

brainly.com/question/19567226

#SPJ4

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2 years ago

Are there any other controllers like Arduino that run C++ ? And if so, what are the names of them? Is there any used outside of

neonofarm [45]

Answer:

An arduino is just a micro controller. It has a programmable CPU and a memory storage. There're plenty of other microcontrollers out there that does the same thing like the NodeMCU or the Teensy 3. A quick google search should reveal alot more alternatives.

You can pretty much program the arduino using any language. The only thing is that had someone made a compiler to translate the code into the 1's and 0's that can be read by the arduino yet.

As for manufacturing, I think they use their own custom made controller. I haven't seen a company that used an arduino yet.

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3 years ago