1. What kind of diagram shows how energy flows from one organism to another?a. producer c. consumer
b. ecology d. food chain

Answers

Answer 1

Answer: It would be D.the food chain

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A car on a 25-m2 hydraulic lift platform weighs 15,000 N. If the force on the smaller piston required to lift it is 1/100 its weight, what is the area of the smaller piston?

Answers

Answer:

The area is 2.5 m²

Explanation:

Step 1: Data given

A car has a 25 m² hydraulic lift platform that weighs 15000 N

The smaller piston required a force to lift = 1/100 its weight

Step 2: Calculate the area of the smaller piston

Pressure = Force / Area

F1 / A1 = F2 / A2

⇒ with F1 = weight of the hydraulic lift = 15000 N

⇒ with A1 = area of the hydraulic lift = 25 m²

⇒ with F2 = 1/100 of it's weight = 1500 N

A2 = F2 / (F1/A1)

A2 = 1500 ( 1500/25)

A2 = 2.5

The area is 2.5 m²

Regarding the formula Al2O3 which of the following is accurate?A. The coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance.
B. The subscript 2 indicates that two atoms of oxygen are present in the substance.
C. The chemical symbol Al indicates that oxygen is present in the substance.
D. The subscript 2 indicates that two atoms of aluminum are present in the substance

Answers

The question says,'regarding the formular Al2O3, which of the following is accurate. The correct option is D. The subscript indicate that there are two atoms of aluminium in the compound. The subscript 3 indicates that, there are three atoms of oxygen in the molecule. The figure 3 attach to oxygen is a subscript not a coefficient, that is why option A is not correct.

Final answer:

In the formula Al2O3, the subscript 2 indicates the presence of two atoms of Aluminium, and the subscript 3 indicates the presence of three atoms of Oxygen.

Explanation:

The formula Al2O3 is for aluminium oxide. The coefficient and subscript in this formula tell us about the number of atoms of each element present in the compound. In this case:

The chemical symbol Al indicates the presence of Aluminium.
The subscript 2 (in Al2) indicates that there are two atoms of aluminum present in the substance.
The chemical symbol O indicates the presence of Oxygen.
The subscript 3 (in O3) indicates there are three atoms of oxygen present in the substance.

So, the correct answer to the question is, the subscript 2 indicates that two atoms of aluminum are present in the substance (option D).

Learn more about Chemical Formulas here:

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The smallest group of particles in a crystal that retains the shape of the crystal is called theA.cube
B.unit cell
C.cage
D.crystal lattice

Answers

Answer:

The correct answer is B.unit cell

Explanation:

An unit cell is an arrangement of particles (atoms, ions or molecules) in a crystal structure. The repetition of the unit cell reproduces the complete crystalline structure of the solid. Depending on how are located the particles, there are different unit cells, for exaple: simple cubic, body-centered cubic, face-centered cubic.

The answer is B. Unit cell.
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What does the pH of a solution have to be in order to be a base?

Answers

Answer:

7.0 = neutral.

(7–14) = basic

(0–6) = acidic

Explanation:

Feelings of sadness __________.a. are only felt by those with depression
b. are one of the major symptoms of depression
c. usually also lead to panic attacks
d. should be ignored even when they last a long period of time

Answers

Feelings of sadness:

A) Sadness can occur within anybody, not just a symptom of depression. This option is out of the question, since it is wrong.

B) Feelings of sadness are usually linked to depression when felt over a long period of time. Studies say that sadness is only a little part of depression, while you mostly feel rejected, hopeless, and worthless. Looking at the other options, this would be the most reasonable answer.

C) This CAN be true in some ways, but panic attacks can be triggered by so many things. The #1 reason is usually when you're nervous or anxious. Panic attacks can even happen out of the blue. Sadness can lead to panic attacks, but not usually. I would say no for this option.

D) Sadness should NOT be ignored when they last over a long period of time. If you are sad for a certain time period, you should look into talking to somebody about the issue. This option is obviously false.

Out of the choices, two out of four were reasonable, but I would have to go with B) are one of the major symptoms of depression.

B) are one of the major symptoms of depression

The slope of a speed time indicates

Answers

The slope of a peed versus time graph indicates acceleration. You can prove this by the fact that slope is Δy/Δx and the units for y are m/s and for x are s which means that the slope has the units (m/s)/s which are the same units used for acceleration.
I hope this helps. Let me know in the comments if anything is unclear.

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