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4 years ago

1. Which property describes a material's ability to dissolve?

Physics

2 answers:

Mkey [24]4 years ago

8 0

Its A...Hope it helps!

galben [10]4 years ago

8 0

<h3>1. <u>Answer;</u></h3>

<em>Solubility</em>

<h3><u>Explanation;</u></h3>

<u><em>Solubility is the property of a substances</em></u>, which is the capability of a given substance, that is called a solute to dissolve in a solvent such as water. in other words it is the degree at which a solute dissolves in a solvent to form a solution.
<em><u>Solubility describes the ability of a substance to dissolve in a solvent at a given temperature.</u></em> it is measured as the maximum amount of solute that can dissolve in a solvent such as water at a particular temperature.

<h3>2. <u>Answer;</u></h3>

<em>D. Plastic has low electrical conductivity, and metal has high electrical conductivity.</em>

<h3><u>Explanation;</u></h3>

In terms of<u><em> electrical conductivity</em></u> materials may either <em><u>be good conductors or bad conductors also insulators</u></em>.

<em><u>Good electrical conductors </u></em>are those materials that allow conduction of electricity with ease, like metals such as copper. Such materials have very high conductivity of electricity.
<u><em>Bad conductors or non conductors</em></u> are those that have low conductivity of electricity, thus they are used as <em><u>insulators,</u></em> they include plastics, wood, etc.
In this case <em><u>metal has high electrical conductivity while plastic coatings have low electrical conductivity</u></em> and thus used as insulator.

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a gym consists of a rectangular region with a semi-circle on each end. if the perimeter of the room is to be a 200 m running tra

Nikolay [14]

The dimensions of the rectangle are:

l = 50 m

b = $100/\pi$ m

<h3>What is a perimeter in math?</h3>

The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides.

<h3>How do we find a perimeter of a rectangle?</h3>

The perimeter of a rectangle,denoted by P is given by the formula, P=2l+2b, where l is the length and b is the breadth of the rectangle.

<h3>Given:</h3>

As per the question:

Perimeter of the room is given as P = 200 m

The region is rectangular having a semicircle at each end.

Now,

Let 'l' be the length of the rectangle, 'b' be its breadth and 'r' be the radius of the semi-circle at each end.

Then, Area of the given rectangle, A = lb

Perimeter of the room, P is = $\pi r+l+\pi r+l=2\pi r+2l=\pi b+2l$

Therefore, $\pi b+2l=200$

$b=(200-2l)/\pi$

Now,

Area, A = $l(200-2l)/\pi=(200l-2l^{2} )/\pi$

Now, differentiate A w.r.t l:

Again differentiating w.r.t 'l', we get:

$d^{2} A/dl^{2} =-4l/\pi$ < 0

Thus we get maximum are when $dA/dl=0$

Therefore,

$(200-4l)/\pi=0$

l = 50 m

Now, from

$\pi b+2l=200$

$\pi b=200-2*50$

$b=100/\pi$

$r=b/2=50/\pi$

To know more about area of a recatangle, visit the link

brainly.com/question/20693059

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1 year ago

Describe electronegativity, and explain the trend of electronegativity in the Periodic Table

vaieri [72.5K]

Explanation:

Electronegativity is the property of an atom that attracts the shared pair of an electron to itself. There is a trend in the periodic table.

While moving down in a group, the electronegativity decreases. This is due to the reason that as we move down the number of shells added and so the electron become very far from the pull of the nucleus.

As we move across a period the electronegativity increases. This is because of the no. of charge on the nucleus increase.

8 0

3 years ago

A group of students collected the data shown below while attempting to measure the coefficient of static friction (of course, it

anzhelika [568]

Answer:

0.130

Explanation:

From the given data, the coefficient of static friction for each trial are:

1. 0.053

2. 0.081

3. 0.118

4. 0.149

5. 0.180

6. 0.198

The sum of the coefficient of static friction = 0.053 + 0.081 + 0.118 + 0.149 + 0.180 + 0.198

= 0.779

So that;

the average coefficient of static friction = $\frac{sum of coefficient of static friction}{number of trials}$

= $\frac{0.779}{6}$

= 0.12983

The average coefficient of static friction is 0.130

8 0

3 years ago

A cat sees its his favorite human come in the door and runs toward him. the cat starts with a velocity of 4.94 m/s and slows to

exis [7]

Answer:

Average acceleration =-2.53m/s^2

Displacement s = 4.2m

Explanation:

4 0

3 years ago

What force does a trampoline have to apply to a gymnast to accelerate her straight up at ? Note that the answer is independent o

Andrew [12]

Answer: Force applied by trampoline = 778.5 N

<em>Note: The question is incomplete.</em>

<em>The complete question is : What force does a trampoline have to apply to a 45.0 kg gymnast to accelerate her straight up at 7.50 m/s^2? note that the answer is independent of the velocity of the gymnast. She can be moving either up or down or be stationary. </em>

Explanation:

The total required the trampoline by the trampoline = net force accelerating the gymnast upwards + force of gravity on her.

= (m * a) + (m * g)

= m ( a + g)

= 45 kg ( 7.50 * 9.80) m/s²

Force applied by trampoline = 778.5 N

5 0

3 years ago