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3 years ago

Explain what a concentration gradient is and what it means for a molecule to diffuse down its

Physics

1 answer:

MArishka [77]3 years ago

7 0

Answer:

Diffusing the gradient ensures that most of the molecules in high concentration zone will wind up in the previously low concentration by the spontaneous movement of small molecules.

Explanation:

A gradient of concentration is the difference between in concentration of one place / area substance to different area. Having a molecule flow down its concentration gradient means moving the molecules from hypotonic areas to the concentration hypertonic areas

Diffusing the gradient ensures that most of the molecules in high concentration zone will wind up in the previously low concentration by the spontaneous movement of small molecules.

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The speed of light in a vacuum is 299,792,458 m/s. Which gives this number in three significant digits? 299,000,000. m/s 2.99 x

dexar [7]

Answer: $2.99(10)^{-8} m/s$

Explanation:

When a number is written in scientific notation (representing the number using powers of base ten) it is expressed so that it contains a digit in the place of the units and all other digits after the decimal point, multiplied by the respective exponent.

Then, the significant figures (or significant digits) will be the digits that are before the power of ten.

Now, in the case of the number 299,792,458 if we want to write it with three significant digits, we have to write it in scientific notation as:

$2.99(10)^{-8}$

7 0

3 years ago

Read 2 more answers

A cheetah runs 900 meters in 30 seconds. how fast is it going?

Serga [27]

900 meters/30 seconds= 30 meters/second

7 0

3 years ago

If a ball is thrown alt 96 m/s, and it travels 3 seconds, what is the total distance the ball travelec

Evgen [1.6K]

Answer: 288 m

Explanation: 288 m is the correct answer because the question states that the ball is thrown at 96 m every second, and our question tells us that the ball travels 3 seconds. This means we have to multiply 96 x 3 = 288 m.

5 0

2 years ago

Read 2 more answers

Without the wheels, a bicycle frame has a mass of 6.71 kg. Each of the wheels can be roughly modeled as a uniform solid disk wit

dalvyx [7]

Answer:43.311 J

Explanation:

Given

mass of frame $\left ( m_f\right )=6.71 kg$

mass of wheel $\left ( m_w\right )=0.820 kg$

radius of wheel $\left ( r\right )=0.343 m$

v=3.22 m/s

Moment of inertia of each wheel\left ( I\right )=\frac{1}{2}mr^2[/tex]

$I=0.0482 kg-m^2$

kinetic Energy of whole cycle=Kinetic energy of wheels and frame+rotational energy of Wheels

$K.E.=\frac{1}{2}\left ( m_f+m_w\right )v^2+2\times \frac{1}{2}I\omega ^2$

$K.E.=\frac{1}{2}\left ( 6.71+0.820\right )3.22^2+2\times \frac{1}{2}0.0482\times \left ( \frac{3.22}{0.343}\right )^2$

K.E.=39.037+4.274=43.311J

4 0

3 years ago

what is the final volume of a gas with an initial volume of 200 .0ml if the pressure decreases from 500.0 kpa to 250.0 kpa

Serjik [45]

Answer:

Given Data:

V2 ?

V1 = 200 ml,

P1 = 500kpa and P2 = 2500kpa

From Boyels law (Ideal gas law) Where temperature remains constant, Pressure is inversely proportional to volume.

P1 .V1 = P2 . V2 ; T=Constant

V2 = (P1.V1) ÷ P2

= (500×200) ÷(250)

= 400 ml

The final volume of the gas is 400 ml.

Note: Increased pressure decreases the volume or decreased pressure increase the volume as they are inversely proportional. Here in our answer pressure decreases from 500 kpa to 250 kpa so volume increases from 200 ml to 400 ml.

5 0

2 years ago