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maksim [4K]
2 years ago
12

Graphite crystals can be used as a lubricant. TRUE FALSE

Physics
2 answers:
timurjin [86]2 years ago
6 0
I think its true because they are a soft solid that can be broken down into a liquid... Hope this helps in any way :3
Murrr4er [49]2 years ago
4 0
 <span>Graphite and Diamond are allotropes of Carbon meaning they have the same chemical properties of carbon (they both burn, yes diamond burns. At 1500 Celcius), but totally different physical properties. Graphite is a good conductor of both electricity and heat, Diamond isn't. Graphite is slippery, Diamond isn't. Graphite is soft, diamond is hard. Diamond is transparent, graphite is a black powder. 

The reason for this is that the lattice structure( geometrical arrangement of carbon atoms in the crystal) of G and D are vastly different (hence different physical propetries), but they are basically the same element(hence the same chemical properties.) 

Graphite has what is known as a Hexagonal Lattice Structure. Imagine a thin slice of a honeycomb placed at a certain distance over another slice, which in turn is placed over the next and so on, with each vertex of each hexagon representing a carbon atom. This is what the graphite crystal structure looks like. Now, the layers of the lattice are bound to the adjacent layers by weak Van der Waals bonds, which allow the layers to slide over one another easily, like a teetering pile of paper sheets. Hence you get the quintessential properties of Graphite - softness, slipperiness and hence it makes an excellent solid lubricant. 

Diamond, on the other hand has a tetrahedral "diamond" structure, in which carbon atoms are held rigidly by neighbouring atoms by powerful bonds that require a great deal of force to be broken. Hence Diamond is hard, strong and can be used as an abrasive to grind and polish other materials.... 

So to answer your question its True

</span>
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A wave travels at a constant speed.How does the frequency change if the wavelength is reduced by a factor of 3 The frequency dec
nata0808 [166]

Answer:

The frequency increases by a factor of 3.

Explanation:

The relation between speed, wavelength and frequency of a wave is given by :

v=f\lambda

or

f\propto \dfrac{1}{\lambda}

A wave travels at a constant speed. If the wavelength is reduced by a factor of 3, it would mean that the frequency increases by a factor of 3 because there is an inverse relationship between wavelength and frequency.

8 0
2 years ago
An infant's toy has a 120 g wooden animal hanging from a spring. If pulled down gently, the animal oscillates up and down with a
Morgarella [4.7K]

Answer:

0.37 m

Explanation:

The angular frequency, ω, of a loaded spring is related to the period, T,  by

\omega = \dfrac{2\pi}{T}

The maximum velocity of the oscillation occurs at the equilibrium point and is given by

v = \omega A

A is the amplitude or maximum displacement from the equilibrium.

v = \dfrac{2\pi A}{T}

From the the question, T = 0.58 and A = 25 cm = 0.25 m. Taking π as 3.142,

v = \dfrac{2\times3.142\times0.25\text{ m}}{0.58\text{ s}} = 2.71 \text{ m/s}

To determine the height we reached, we consider the beginning of the vertical motion as the equilibrium point with velocity, v. Since it is against gravity, acceleration of gravity is negative. At maximum height, the final velocity is 0 m/s. We use the equation

v_f^2 = v_i^2+2ah

v_f is the final velocity, v_i is the initial velocity (same as v above), a is acceleration of gravity and h is the height.

h = \dfrac{v_f^2 - v_i^2}{2a}

h = \dfrac{0^2 - 2.71^2}{2\times-9.81} = 0.37 \text{ m}

3 0
3 years ago
List the levels of classification in order from most broad (largest number of organisms) to most specific (smallest number of or
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Every organism may classified into seven level of classifications, such that each level contains organisms with similar characteristics. Kingdom is the largest and the broadest level of classification while species is the smallest and most specific level of classification. Therefore from the largest to the smallest the order is as follows:
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3 0
3 years ago
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Leya [2.2K]

Answer:

a)Taking into consideration Newton’s second law, we know that

Net_Force = mass * acceleration

Since the box is pulled at constant speed, the acceleration is equal to zero.

This means that

Net_Force  = 0 N

b) Force of friction

The net force is equal to the sum of all forces,

Net_Force   = Force_applied - Friction

We found that Net_Force  = 0, which means

Friction = Force_applied = 48 N

c) If the box comes to a stop. And the applied force becomes zero, the friction force becomes also zero.

Friction  = 0 N

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2 years ago
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Answer:

It represents battery

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