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3 years ago

Why do we need body membrane

1 answer:

8 0

So we have a structured form, but can still move. If we had a cell wall we would be stiff objects since it’s just a cell membrane we can still have movement

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A train travels at a speed of 30 m/s. The train starts at an initial position of 1000 meters and travels for 30 seconds. What is

torisob [31]

Answer:

1900 metres

Explanation:

Given that a train travels at a speed of 30 m/s. The train starts at an initial position of 1000 meters and travels for 30 seconds.

The parameters to be considered are:

Speed = 30 m/s

Time = 30 seconds

Speed = distance/time

Substitute the parameters into the formula

30 = distance / 30

Cross multiply

Distance = 30 × 30

Distance = 900 m

Since the train started from a position of 1000 m , the final position will be:

Final position = 1000 + 900

Final position = 1900 metres

6 0

3 years ago

In Hooke's law, Fspring=kΔx, what does the ∆x stand for

monitta

Answer:

Change in Displacement

Explanation:

delta/triangle = change

x = displacement

formula (if needed): final x - initial x

7 0

3 years ago

What happens to an electromagnetic wave that is stretched or squeezed together in space?

ss7ja [257]

The wavelength and frequency of the wave is altered, resulting in a change in the amount of energy carried.

5 0

3 years ago

What do you think will happen to dirt and rocks on the Mountainside when the ice melts

AlekseyPX

This question is personal preference... just answer with whatever YOU think, there probably isn’t s wrong answer if I’d guess.

3 0

3 years ago

In a container there are 2 liters of liquid, of which 75% is alcohol and the remaining 25% is water.

arsen [322]

Answer:

<em>There must be added 500 cm3 of alcohol to bring the concentration to 80%.</em>

Explanation:

<u>Concentration</u>

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solution.

In the container, there are 2 liters (2000 cubic centimeters) of a solution, 75% of which is alcohol (solute) and 25% of water (solvent).

The original amount of alcohol is:

H = 2000*75% = 1500 cc

The original amount of water is:

W = 2000*25% = 500 cc

When we add x cc of pure alcohol, there are 1500+x cc of alcohol out of 2000+x cc of solution.

The new concentration is calculated as:

$\displaystyle \frac{1500+x}{2000+x}$

And it's known this concentration is 80% (0.8), thus:

$\displaystyle \frac{1500+x}{2000+x}=0.8$

Multiplying by 2000+x:

$1500+x = 0.8(2000+x)$

Operating:

$1500+x = 1600+0.8x$

Rearranging:

$x-0.8x=1600-1500$

$0.2x=100$

$x=100/0.2$

x= 500

There must be added 500 cm3 of alcohol to bring the concentration to 80%

4 0

3 years ago