Answer:
En matemáticas, el conjunto de los números reales (denotado por {\displaystyle \mathbb {R} }\mathbb{R}) incluye tanto a los números racionales, (positivos, negativos y el cero) como a los números irracionales;1 y en otro enfoque, trascendentes y algebraicos. Los irracionales y los trascendentes2 (1970) no se pueden expresar mediante una fracción de dos enteros con denominador no nulo; tienen infinitas cifras decimales aperiódicas, tales como: {\displaystyle {\sqrt {5}}}{\sqrt {5}}, π, o el número real: {\displaystyle log(2)}{\displaystyle log(2)}, cuya trascendencia fue enunciada por Euler en el siglo XVIII.2
Los números reales pueden ser descritos y construidos de varias formas, algunas simples aunque carentes del rigor necesario para los propósitos formales de matemáticas y otras más complejas pero con el rigor necesario para el trabajo matemático formal.
Durante los siglos XVI y XVII el cálculo avanzó mucho aunque carecía de una base rigurosa, puesto que en el momento prescindían del rigor y fundamento lógico, tan exigente en los enfoques teóricos de la actualidad, y se usaban expresiones como «pequeño», «límite», «se acerca» sin una definición precisa. Esto llevó a una serie de paradojas y problemas lógicos que hicieron evidente la necesidad de crear una base rigurosa para la matemática, la cual consistió de definiciones formales y rigurosas (aunque ciertamente técnicas) del concepto de número real.3 En una sección posterior se describirán dos de las definiciones precisas más usuales actualmente: clases de equivalencia de sucesiones de Cauchy de números racionales y cortaduras de Dedekind.
Explanation:
Where It should take about 30 minutes for the aspirin Manny just took to relieve his headache, but Manny feels better within minutes. This is an example of "the placebo effect."
<h3>What is a placebo Effect?</h3>
The placebo effect is a phenomenon in which a person's expectations or beliefs influence their perception of pain or other symptoms. A placebo is a substance or treatment that has no real effect on the condition but is given to the person as if it does. For example, a placebo pill may look like a real medicine, but it contains no active ingredient.
Sometimes, just taking a placebo can make a person feel better because they think they are receiving a helpful treatment. This can reduce their stress, anxiety, or negative emotions, which can affect their pain or discomfort.
The placebo effect is not a sign of weakness or imagination. It is a real psychological and physiological response that can be measured and observed.
The placebo effect can also work in the opposite direction. If a person expects treatment to have harmful or unpleasant side effects, they may experience them even if the treatment is harmless. This is called the nocebo effect.
Some possible examples of the placebo and nocebo effects are:
- A person with a cold drinks a cup of herbal tea and feels less congested, even though the tea has no effect on the virus.
- A person with a headache takes a sugar pill and feels less pain, even though the pill has no analgesic properties.
- A person with insomnia listens to a soothing sound and falls asleep faster, even though the sound has no effect on their sleep cycle.
- A person with allergies eats food they think they are allergic to and develops a rash, even though the food has no allergens.
- A person with depression takes an antidepressant and feels more depressed, even though the antidepressant has no negative effect on their mood.
- A person with high blood pressure takes a blood pressure medication and feels dizzy, even though the medication has no side effects.
Learn more about the Placebo Effect:
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Answer:
C, Writing
Explanation:
nothing really to explain
The relationship between the magnitude of the force of tension and the force of friction is; Ff = (r/R)Ft
<h3>What is Rotational Acceleration?</h3>
We are given;
mass of spool = M
Radius = R
moment of inertia = I.
Now, the spool is not moving and as such;
r < R which means there is net torque = 0
Thus;
Ff × R = Ft × r
>> Ff = (r/R)Ft
Finally, the angular acceleration is expressed as;
α = a/R
Read more about Rotational Acceleration at: brainly.com/question/16968864
Answer:
Yes
Explanation:
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