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2 years ago

Differentiate between adhesion and cohesion.

Physics

1 answer:

sergiy2304 [10]2 years ago

8 0

<h2>Answer:</h2>

<h2>Cohesion </h2>

Is the attraction that molecules have for others of their same type.

<h2>Adhesion </h2>

Is the attraction that molecules have for others of different type by intermolecular forces.

A good example of both is water that can stick to itself through hydrogen bonds (cohesion) and can also stick to a glass due to adhesion.

So, while Cohesion is the force of attraction between adjacent particles within the same body, Adhesion is the interaction between the surfaces of different bodies.

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An ambulance is driving towards the hospital at a velocity 108 km/h and emitting a steady 798-Hz sound from its siren. The sound

slava [35]

To solve this problem we will apply the concepts related to the Doppler effect. The Doppler effect is a physical phenomenon where an apparent change in wave frequency is presented by a sound source with respect to its observer when that same source is in motion. Mathematically it can be described as

$f_d= f_s \frac{(v+v_d)}{(v-v_s)}$

The meaning of each of these variables is,

$v_d=$ Velocity of detector

$f_s$ =Frequency of wave emitted by source

$v_s=$ Velocity of source

v=Velocity of sound wave

$f_d$ =Frequency received by detector

Replacing we have that,

$f_d = 798(\frac{(343+30)}{(343-30)})$

$f_d=950 Hz$

Therefore the correct option is e. 950Hz

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2 years ago

It is a way to display to number of ________ for elements. This chart will show the correlation between ______ number and the nu

pav-90 [236]

Answer:

Electrons

Atomic number

Explanation:

The question describes a period table which is a chart of the elements.

The Periodic Table of elements shows the arrangement of elements based on their increasing atomic number.

In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number. In addition, the position of an element in the periodic table—its column, or group, and row, or period—provides useful information about how those electrons are arranged (electronic configuration) in their different shells.

It is a way to display to number of ____electrons____ for elements. This chart will show the correlation between __atomic____ number and the number of valence electrons

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3 years ago

A rear window defroster consists of a long, flat wire bonded to the inside surface of the window. When current passes through th

GenaCL600 [577]

Answer:

$\rho=1.8\times 10^{-8}\Omega.m$

Explanation:

Given:

width of the wire, $w=1.8\ mm=1.8\times 10^{-3}\ m$

thickness of the flat wire, $d=0.12\ mm=1.2\times 10^{-4}$

length of the wire, $l=12\ m$

voltage across the wire, $V=12\ V$

current through the wire, $I=12\ A$

Now the net resistance of the wire:

using ohm's law

$R=\frac{V}{I}$

$R=\frac{12}{12}$

$R=1\ \Omega$

We have the relation between the resistivity and the resistance as:

$R=\rho.\frac{l}{a}$

where:

a = cross sectional area of the wire

$\rho =$ resistivity of the wire material

$1=\rho\times \frac{12}{1.8\times 10^{-3}\times 1.2\times 10^{-4}}$

$\rho=1.8\times 10^{-8}\Omega.m$

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3 years ago

Since rods are about 1000 times more sensitive than cones (at 470 nm), they should be able to detect smaller values of the elect

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Answer:

a. Rods are about 1000 times more sensitive than cones.

Explanation:

The answer choice shown is a direct copy of the first line of the problem statement. It doesn't appear to be any more complicated than that. (It's a reading comprehension question.)

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2 years ago

A car goes North a distance of 120 kilometers during a time period of 3.0 hours. What is the average

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Answer:

the average speed of the car during this time interval is 40 m/s i thinkk..

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2 years ago