the answer is by adding the vectors.
i (J)hope this helps
The river current is moving with velocity vc=10 km/h in a certain direction relative to the shore. The boat is moving with velocity vb=10 km/h relative to the current, and in the same direction as the current, so the total velocity of the boat relative to the shore will be equal to the sum of the two vectors (because they are in the same direction):
v=vb+Vc = 10 km/h + 10 km/h = 20 km/h
Answer:
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Explanation:
Chlorine’s disinfection properties have helped improve the lives of billions of people around the world. Chlorine also is an essential chemical building block, used to make many products that contribute to public health and safety, advanced technology, nutrition, security and transportation.
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A 40.3 ml sample of a 0.587 m aqueous hydrocyanic acid solution is titrated with a 0.363 m aqueous sodium hydroxide solution. The pH after 19.9 ml of base have been added is 12
After 19.9 mL of NaOH have been added we have gone way past the equivalence point, so there is a lot of excess NaOH,
⇒ 40.3 - 19.9 = 20.4 mL excess
⇒ 0.0204 L (0.363 M) = 0.0074 moles NaOH excess,
⇒ 0.0074 moles / (0.0199 + 0.0403)
⇒ 0.122 M NaOH at this point,
[OH]⁻ = [NaOH]
pOH = - log (0.122) = 2.103
pH = 14 - pOH = 11.897 = 12
Hence, pH = 12, After 19.9 mL base have been added.
To learn more about titration here
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Answer:
1- El uso óptimo de artefactos eléctricos en el hogar y el consumo de energía eléctrica tienen una relación de absoluto ligamen. Así, a mayor cuidado del consumo, y mejores los artefactos en su relación prestación/consumo, menor será el consumo de energía eléctrica en el hogar y, por ende, menor el gasto en el servicio.
2- El uso óptimo de energía eléctrica se explica a través de la física mediante el concepto de resistencia eléctrica, es decir, a mayor resistencia eléctrica, mayor será el consumo que el artefacto generará.
3- El consumo mensual de energía eléctrica se determina a través de la cantidad de kilovatios que cada hogar consume mensualmente. Así, a mayor cantidad de kilovatios (que es la unidad de medida de la energía eléctrica), mayor será el consumo.
4- El costo del servicio se valúa en función de los kilovatios consumidos en el periodo de medición. Así, cuando mayor sea el consumo mayor será el costo; incluso en algunos lugares, como Argentina, cuanto mayor sea el consumo de electricidad, mayor será el costo del kilovatio.