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3 years ago

A good model of the cell membrane would be

Physics

1 answer:

Nonamiya [84]3 years ago

6 0

B. A film of food wrap. The cell membrane is the outermost layer that is protecting the cell

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How can you make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet?

koban [17]

Answer:

Explanation:

You can heat it and then let it cool in a very strong magnetic field.

4 0

3 years ago

Read 2 more answers

(1 point) Answer the following questions about the sphere whose equation is given by x2+y2+z2−4x+4y=73. x2+y2+z2−4x+4y=73. 1. Fi

pychu [463]

Answer:

R=9.

C=(2,-2,0).

Explanation:

Lets try to find how $x^2+y^2+z^2-4x+4y=73$ can be written in the form of $(x-a)^2+(x-b)^2+(x-c)^2=R^2$ , since then its radius R and center of coordinates C=(a,b,c) would be easily recognizable.

Since we have the terms -4x and +4y, they seem to have come from the terms $(x-2)^2$ and $(y+2)^2$ , and we would need to take care of the extra +4 by substracting then. More explicitly:

$(x-2)^2-4=x^2-4x+4-4=x^2-4x$ , as we had originally with the x terms

$(y+2)^2-4=y^2+4y+4-4=y^2+4y$ , as we had originally with the y terms

Which means:

$x^2-4x+y^2+4y+z^2=(x-2)^2-4+(y+2)^2-4+z^2$

Or, putting all together:

$(x-2)^2-4+(y+2)^2-4+z^2=73$

$(x-2)^2+(y+2)^2+z^2=9^2$

So our radius is 9 and the center is (2,-2,0).

5 0

3 years ago

A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the 7) magnitude of the change

IRISSAK [1]

Answer:

Change in momentum will be -4.4 kgm/sec

So option (A) is correct option

Explanation:

Mass of the ball is given m = 0.10 kg

Initial velocity of ball $v_1=25m/sec$

And velocity after rebound $v_2=-19m/sec$

We have to find the change in momentum

So change in momentum is equal to $=m(v_2-v_1)=0.1\times (-19-25)=-4.4kgm/sec$ ( here negative sign shows only direction )

So option (A) will be correct answer

5 0

3 years ago

Two point sources are vibrating in phase producing two-dimensional water wave interference. The first antinodal line on either s

Viktor [21]

For all antinodal positions we know that

$\Delta \phi = 2N\pi$

now we also know the relation between phase difference and path difference

$\Delta \phi = \frac{2\pi}{\lambda}\Delta x$

now we will have

$2N\pi = \frac{2\pi}{\lambda}\Delta x$

now from above equation we will have

$\Delta x = N\lambda$

now for the first anti node position

N = 1

$\Delta x = \lambda$

Option D is correct

4 0

3 years ago

What is hard but flexible structure is found in the nose and ears

avanturin [10]

<span>Cartilage is the hard but flexible structure found in pieces of your nose and ears. It is similar to bone, but allows for flexibility and movement. When looking at skeletons, you'll notice that they don't have a nose or ears, because cartilage deteriorates much faster than bone. Cartilage is also found in elsewhere in the animal kingdom--the skeletal structure of a shark is made primarily from cartilage!</span>

4 0

3 years ago