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inna [77]
3 years ago
7

If a beaker of water is placed under a broiler so that the heating coil is above the beaker. It is observed that only the surfac

e layer boils. The water at the bottom of the beaker remains close to the initial temperature of the water. Which of the following statements is the most reasonable conclusion to be drawn from these observations?
a) Water is a poor conductor of heat.
b) The sample must contain impurities.
c) Water is easily heated by radiation.
d) Water exhibits anomalous thermal behavior.
e) The molecular motion in the sample is not random.
Physics
1 answer:
bija089 [108]3 years ago
5 0

Answer:

a

Explanation:

The most reasonable conclusion of the above phenomenon is that water is a poor conductor of heat. Basically water is an insulator. The heat from surface to the bottom of the beaker will take a lot of time. Moreover, no convection current is formed so, heat might not even reach the bottom surface. Hydrogen bonding also play a vital role in determining the thermal properties of water.

hence option A is correct

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dos contenedores de objetos tienen 30 y 40 kg de masa respectivamente y están sobre una superficie horizontal sin rozamiento una
Dmitry_Shevchenko [17]

Answer:

The acceleration of each mass is the same, and approximately equal to 1.43\,\,\frac{m}{s^2}

Explanation:

Notice that the mass of the whole system is: 30 kg + 40 kg = 70 kg

If we use a net force of 100 N on the combined system, we can find the acceleration imparted to the masses via Newton's second law:

F_{net}= M\,*\,a\\100\,\,N = 70\,\,kg * a\\a = \frac{100}{70} \,\frac{m}{s^2} \\a\approx 1.43\,\frac{m}{s^2}

4 0
3 years ago
Differences between adhesion and cohesion​
pickupchik [31]

Answer:

As for the definitions, the tendency of two or more different molecules to bond with each other is known as Adhesion, whereas the force of attraction between the same molecules is known as Cohesion.

hopefully this helps

7 0
3 years ago
Read 2 more answers
Under normal conditions, what color do we expect diamonds to be?​
Ann [662]
Under normal lighting conditions, most diamonds appear to be colorless the naked eye. Many consumers think that all diamonds are colorless, however, in reality, they come in a wide range of colors. Actualcolor differences are very subtle.
8 0
3 years ago
An airplane is seller rates down a runway at 3.10 M/S squared 441.5 seconds from rest until finally left off the ground ,what is
sineoko [7]

Answer:

302129m

Explanation:

Using s= ut + 1/2at²

But u= 0

So

S= 1/2(3.1)(441.5)²

=302129m

6 0
4 years ago
What can be said about two numbers that have either a positive or negative correlation? No relationship exists. A relationship i
Deffense [45]

A relationship exists and the numbers cause one another can be said about two numbers that have either a positive or negative correlation

Option : C

<u>Explanation:</u>

When two numbers have positive correlation, they move in the same direction. If the first variable increases, the second one also increases and if one variable decreases the other one also decreases.If the two numbers have negative correlation, the two numbers move in opposite directions.

A relationship exists between two numbers and the number cause one another. A correlation means that changing one variable affects the other. Correlation among variables need not necessarily imply causation. Positive correlations are mostly used in Finance and stock markets.

7 0
3 years ago
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