Answer:
5ms⁻²
Explanation:
Given that,
Initial velocity of car (at t=0) u=0 m/s
Final velocity of car (after 10 sec) v=50 m/s
Time taken (t)= 10 sec.
acceleration(a)=?
now,
v = u + at
at = v-u
a= (v-u) / t
a= (50-0) / 10
a = (50/10)
a=5 ms⁻²
Answer:
4
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3
Explanation:
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<h2>
Answer: The half-life of beryllium-15 is 400 times greater than the half-life of beryllium-13.</h2>
Explanation:
The half-life of a radioactive isotope refers to its decay period, which is the average lifetime of an atom before it disintegrates.
In this case, we are given the half life of two elements:
beryllium-13:
beryllium-15:
As we can see, the half-life of beryllium-15 is greater than the half-life of beryllium-13, but how great?
We can find it out by the following expression:
Where is the amount we want to find:
Finally:
Therefore:
The half-life of beryllium-15 is <u>400 times greater than</u> the half-life of beryllium-13.
Answer:
La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una resistencia combinada de 15 Ω tiene un valor de 60 Ω
Explanation:
Las resistencias son aquellos dispositivos en los circuitos eléctricos que suelen emplearse para oponerse al paso de la corriente eléctrica.
Se denomina resistencia resultante o equivalente al valor de la resistencia que se obtiene al considerar un conjunto de ellas.
Cuando tenes resistencias en paralelo la corriente se divide y circula por varios caminos.
La resistencia equivalente de un circuito de resistencias en paralelo es igual al recíproco de la suma de los inversos de las resistencias individuales:
Esto también puede ser expresado como:
Entonces, en este caso sabes:
Reemplazando:
y resolviendo:
se obtiene:
R2=60 Ω
<u><em>La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una resistencia combinada de 15 Ω tiene un valor de 60 Ω</em></u>
It gets into the atmosphere through evaporation, it wafts round as clouds and water vapor, then eventually precipitates out somewhere as rain or snow. This enters it into the biosphere, because every living thing on Earth needs water, and obviously in to the hydrosphere because... water is water. As moving water (streams, glaciers, etc.), it weathers and erodes the geosphere (the lithosphere is part of the geosphere). Deep down where rocks become sedimentary or metamorphosed, water also influences what kind of rock you get (as is also the case with cooling lava, but that's basically water at its first stage of entering the cycle).