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3 years ago

IS THIS CORRECT???...........................

Physics

1 answer:

never [62]3 years ago

8 0

Answer:

A. consumers

B. multi-cellular

Explanation:

Only plants have chlorophyll and only plants have a cell wall so C and D are out of the window. They are consumers because, they don't have photosynthesis so they have to eat. They are multi-cellular because, animals all have at least a brain, body, etc. Which all need millions of cells.

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Magnesium (Mg) has 12 protons and an atomic mass of 24. How many neutrons does magnesium have?

JulijaS [17]

An atom is made up of three different particles, which are proton, neutron and electron. The proton and the neutron are located in the nucleus of the atom and they make up mass of the atom. The electron orbit around the nucleus. The proton is positively charged while the electron is negatively charged, thus, for the atom to remain neutral, the number of proton and electron in an atom must be equal. The neutron has no charge.
The atomic mass of an element = number of proton + number of neutron
Atomic mass of magnesium= 24
Number of proton = 12
Therefore, number of neutron = 24 - 12 = 12.
Thus, the number of neutron = 12.

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3 years ago

Read 2 more answers

An apple falls off a roof .It takes the apple 15.7 seconds to hit the floor . How far did the apple fall?

slava [35]

Answer:

8.83m below I hope I got it

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3 years ago

An aquarium 8 m long, 4 m wide, and 4 m deep is full of water. The hydrostatic pressure on the bottom of the aquarium is ____ Ne

MA_775_DIABLO [31]

Answer:

Explanation:

Given

length=8 m

width=4 m

deep=4 m

Area of base $A=4\times 8=32 m^2$

hydro static Pressure on bottom $=\rho gh$

$P=10^3\times 9.8\times 4=39.2 kPa$

Force on bottom $=P\times A=1254.4 KN$

Now pressure at the side wall

$F=\rho gA \bar{x}$

where $\bar{x}$ is the mean length of wall = 4 m

$F=10^3\times 9.8\times 4\times 8\times 2=627.2 KN$

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3 years ago

What are dependent variables? Give an example.

Svetradugi [14.3K]

Dependent variables are, as you might guess, variables that depend on certain conditions. An independent variable is a variable whose value can be freely changed. A variable is dependent if its value is adjusted as a direct consequence of a change in the independent variable.

For example, consider a square with side length x. Then its perimeter is 4 times the side length,

P = 4x

and its area is the square of the side length,

A = x ²

If x = 1, then P = 4 and A = 1. If x = 2, then P = 8 and A = 4. And so on. If we treat x as the independent variable, then P and A are dependent variables that depend on the value of x.

But you can also go the other way and express x as functions of P or A, making x a dependent variable that depends on the values of P or A. For example, solving for x in terms of P gives

P = 4x ===> x = P/4

Then if P = 4, we have x = 8. If P = 16, then x = 1. And so on. You can think of A in the same way.

You can even go one step further and express the area A as a function of the perimeter P :

P = 4x ===> x = P/4

Then

A = x ² = (P/4)² = P ²/16

So in this case, P is the independent variable upon which the dependent variable A depends. If P = 4, then A = 1. If P = 8, then A = 4. etc

In a scientific study, "independent variable" is associated with some quantity or measurement that you control, and the "dependent variable" is the quantity or measurement that you take in response to a change in the independent variable. The meaning of either is the same, but actual studies typically don't involve simple equations like the ones I use as examples here.

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2 years ago

Why do bulbs in series circuit glow brightly than those in the parallel circuit?

barxatty [35]

In series, both bulbs have the same current flowing through them. The bulb with the higher resistance will have a greater voltage drop across it and therefore have a higher power dissipation and brightness. In parallel, both bulbs have the same voltage across them.

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3 years ago