Answer:
635 years old
Explanation:
The light reaching the earth from the sun will travel at a speed called the speed of light, and this has a universal value of 3 × 10⁸ m/s. Bearing this in mind, let us calculate the age of the light reaching the Earth from the sun:
Distance of star from Earth = 6.1 × 10⁸m
Speed of light = 3 × 10⁸ m/s
We have distance and speed, let us calculate the time of travel of the light from the star to the earth.
Distance = speed × time
6.1 × 10⁸ = 3 × 10⁸ × time
In order to do the division above, we will divide the whole numbers normally, then we will apply the law of indices to the power that says:
Xᵃ ÷ Xᵇ = X⁽ᵃ⁻ᵇ⁾
Next, we are told that there are 3.2 × 10⁷ seconds in a year.
∴ The number of years travelled by the light from the star:
please note that:
2.03 × 10¹⁰ = 20300000000
3.2 × 10⁷ = 32000000
The closest answer in the option is 635 years, and we are short of this by some points due probably to approximations in the calculation.
Answer: Metallic bond
Metallic bond can be defined as a force of attraction that
exit between a metal atoms and the velency eletron. Also, this bond arise from
the electostatic force of attraction that between conduction electrons and
positively charged metal ions. Thus, the electron usually act as a glue by giving
the substance a definite structure.
Question:
Assumptions
Voltage of battery = 24 V
Resistance on the right,20Ω parallel to 10 Ω resistor
Answer:
For the current out of the battery to be the same as when the switch was opened with the switch closed, the resistance on the resistor on the right must be approximately 20/3 Ω
Explanation:
We note that the switch in the assumption is on the same line as the 20 Ω resistor.
With a voltage of 24 V, and the switch closed, we have;
Total resistance = 
Current out of voltage, I = Voltage/(total resistance)
= 24 ÷ 20/3 = 24 × 3/20 = 18/5 A
Therefore, with the switch opened, we get
Resistance on the right = Initial total resistance 
Therefore, with the switch opened, the resistance on the resistor on the right must be approximately equal to the resultant resistance of the two resistances in parallel.
Answer:
La fuerza eléctrica es -8.2*10⁻⁸ N
Explanation:
El enunciado correcto es: <em>¿Cuál es la fuerza eléctrica sobre el electrón (-1.6 x 10⁻¹⁹c) de un átomo de hidrógeno ejercida por el protón (1.6 x 10⁻¹⁹c)? Supóngase que la distancia entre el electrón y el protón es de 5.3 x 10⁻¹¹ m</em>
Entre dos o más cargas aparece una fuerza denominada fuerza eléctrica. Su valor depende del valor de las cargas y de la distancia que las separa, mientras que su signo depende del signo de cada carga. Las cargas del mismo signo se repelen entre sí, mientras que las de distinto signo se atraen.
La fuerza eléctrica con la que se atraen o repelen dos cargas puntuales en reposo es directamente proporcional al producto de las mismas e inversamente proporcional al cuadrado de la distancia que las separa:
donde:
-
F es la fuerza eléctrica de atracción o repulsión. En el Sistema Internacional (S.I.) se mide en Newtons (N).
- q1 y q2 son lo valores de las dos cargas puntuales. En el S.I. se miden en Culombios (C).
- d es el valor de la distancia que las separa. En el S.I. se mide en metros (m).
- K es una constante de proporcionalidad llamada constante de la ley de Coulomb. Depende del medio en el que se encuentren las cargas. Para el vacío K tiene un valor aproximadamente de 9*10⁹
.
En este caso:
- K= 9*10⁹
Reemplazando:
Resolviendo:
F= -8.2*10⁻⁸ N
<u><em>La fuerza eléctrica es -8.2*10⁻⁸ N</em></u>
Answer:
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Explanation:
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