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MAVERICK [17]
3 years ago
8

Question 12 of 15

Physics
1 answer:
ra1l [238]3 years ago
3 0

Answer:

Covalent bond.

Explanation:

There are 4 main types of bonds:

Covalent, ionic, metallic, and hydrogen.

Covalent bond: Involves the sharing of pairs of electrons, here the difference between the electronegativity of the atoms is not too large. Covalent bonds usually form an octet of electrons.

Ionic bond: This happens because the electrostatic attraction between the atoms whit very different electronegativities

Hydrogen bond: Electrostatic attractive force between an electronegative atom and a hydrogen atom covalently bonded to another electronegative atom.

Metallic bond: Type of bond that makes the metallic atoms to stay really tightly together. The atoms bond because of the electrostatic atractive force between conduction electrons and positively charged metal ions.

Now, in this case, we have the bond between Nitrogen (electronegativity = 2.0) and Hydrogen (electronegativity = 2.1)

So we can see that:

The elements are not metals, so we can discard metallic bond.

For a hydrogen bond, we need 3 atoms (one of which is hydrogen), here we have two, so we can discard this option.

Ionic bond needs different electronegativities, here the electronegativities are really close together, so the ionic bond can be discarded.

we can conclude that the bond will be a covalent bond.

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When a guitar is tuned to adjust it pitch what is it that is changed?
suter [353]

Answer:

B) Its frequency

Explanation:

  • <u>The pitch of sound heard depends on its frequency of the sound wave. Frequency refers to how fast the sound wave is oscillating. </u>
  • A high frequency sound wave has a high pitch while a low frequency sound wave has a low pitch.
  • The faster the sound wave oscillates the higher the pitch. For instance, a guitar with a big heavy string will vibrate slowly and thus create a low pitch.

3 0
3 years ago
4.72 A full-wave bridge-rectifier circuit with a 1-k load operates from a 120-V (rms) 60-Hz household supply through a 12-to-1 s
melisa1 [442]

Answer:

a) 12.74 V

b) Two pairs of diode will work only half of the cycle

c) 8.11 V

d) 8.11 mA

Explanation:

The voltage after the transformer is relationated with the transformer relationshinp:

V_o=Vrms*\frac{1}{12}\\V_o=10Vrms

the peak voltage before the bridge rectifier is given by:

V_{op}=Vo*\sqrt{2}\\V_{op}=14.14V

The diodes drop 0.7v, when we use a bridge rectifier only two diodes are working when the signal is positive and the other two when it's negative, so the peak voltage of the load is:

V_l=V_{op}-2(0.7)\\V_l=12.74V

As we said before only two diodes will work at a time, because the signal is half positive and half negative,so two of them will work only half of the cycle.

The averague voltage on a full wave rectifier is given by:

V_{avg}=2*\frac{V_l}{\pi}\\V_{avg}=8.11V

Using Ohm's law:

I_{avg}=\frac{V_{avg}}{R}\\\\I_{avg}=8.11mA

7 0
3 years ago
Which statement describes the use of control rods?
Anit [1.1K]
Control rods<span> are </span>rods<span>, plates, or tubes containing a neutron absorbing material (material with high absorbtion cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to </span>control<span> the power of a nuclear reactor.
so the statement that describe a control rod is:
</span><span>Control rods are lowered into the reactor to slow down the reaction by absorbing neutrons.</span>
6 0
4 years ago
Read 2 more answers
Bonsoir, je suis complètement bloquée, j’ai besoin de répondre aux 3 questions:
Lapatulllka [165]

Answer:

3)le changement oblige le monde à rechercher des sources d'énergie et de carburant alternatives à faible émission de carbone.... le remplacement des combustibles fossiles par des alternatives renouvelables telles que les biocarburants est un moyen efficace de réduire ces émissions ... ... combiné à une croissance économique significative dans les économies émergentes ... 3) Sécuriser l'approvisionnement énergétique

Explanation:2)Le calculateur d'équivalences de gaz à effet de serre utilise le taux d'émission marginal moyen pondéré national américain de CO2 moyen de l'outil AVoided Emissions and GenRation Tool (AVERT) pour convertir les réductions de kilowattheures en unités évitées d'émissions de dioxyde de carbone.

La plupart des utilisateurs du calculateur d'équivalences qui recherchent des équivalences pour les émissions liées à l'électricité veulent connaître les équivalences pour les réductions d'émissions des programmes d'efficacité énergétique (EE) ou d'énergie renouvelable (ER). Pour calculer les effets des émissions d'EE et d'ER sur le réseau électrique, il faut estimer la quantité de production d'énergie fossile et les émissions déplacées par l'EE et les ER. Un facteur d'émission marginal est la meilleure représentation pour estimer quelles unités alimentées aux combustibles fossiles EE / ER sont déplacées dans le parc fossile. Les programmes d'EE et d'ER ne sont généralement pas supposés affecter les centrales électriques de base qui fonctionnent tout le temps, mais plutôt les centrales électriques marginales qui sont mises en service si nécessaire pour répondre à la demande. Par conséquent, AVERT fournit un facteur d'émission marginal national pour le calculateur d'équivalences.

Facteur d'émission

1558,8 lb CO2 / MWh × (4,536 × 10-4 tonnes métriques / lb) × 0,001 MWh / kWh = 7,07 × 10-4 tonnes métriques CO2 / kWh

1)Dans le préambule de la réglementation conjointe EPA / Department of Transportation du 7 mai 2010 qui a établi les normes d'économie de carburant du programme national initial pour les années modèles 2012-2016, les agences ont déclaré qu'elles avaient accepté d'utiliser un facteur de conversion commun de 8887 grammes de Émissions de CO2 par gallon d'essence consommé (Federal Register 2010). A titre de référence, pour obtenir le nombre de grammes de CO2 émis par gallon d'essence brûlée, la teneur en chaleur du carburant par gallon peut être multipliée par le kg de CO2 par teneur en chaleur du carburant.

Cette valeur suppose que tout le carbone de l'essence est converti en CO2 (GIEC 2006).

Calcul

8887 grammes de CO2 / gallon d'essence = 8,887 × 10-3 tonnes métriques de CO2 / gallon d'essence

7 0
4 years ago
Were there experiences in his life that led to his interest in science and the study of the atom?
charle [14.2K]

Answer:

The right answer is Democritus

Explanation:

He experienced bonding with his father which strongly resulted his interest in science and to the study of the atoms ;)

Your welcome

5 0
2 years ago
Read 2 more answers
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