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3 years ago

Create a hypothesis for this testable question: How does price affect the amount of chocolate people buy?

Physics

1 answer:

Wittaler [7]3 years ago

5 0

Answer:

IF the price of chocolate increases, THEN the amount of chocolate people buy decreases

Explanation:

In a scientific investigation, an observation is first made. Based on this observation, a scientific question is then asked. However, a HYPOTHESIS is given next to explain the question asked. A hyothesis is a testable explanation given to solve an observed problem or provide a possible answer to a question.

The hypothesis must be subject to testing via EXPERIMENTATION. A hypothesis usually goes in an IF, THEN format. In this case with the testable question: How does price affect the amount of chocolate people buy?

A hypothesis that can explain this question is: IF the price of chocolate increases, THEN the amount of chocolate people buy decreases.

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A container of water is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much wo

mariarad [96]

Answer:

Work done, W = 0

Explanation:

Given that, a container of water is lifted vertically 3.0 m then returned to its original position.The total weight of the container is 30 N. We need to find the total work done by the container. We know that the work done by an object is given by :

W = F × d

Where

F is the applied force

d is the displacement of the object

It is mentioned that the container returns to its original position, the displacement of the container is equal to 0. Hence, no work was done by the container of water.

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4 years ago

Para fabricar la bicicleta de un niño pequeño se tiene en cuenta que la fuerza que puede desarrollar es menor que la de un adult

Georgia [21]

Answer:

a) El piñón debe tener 20 dientes.

b) La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

Explanation:

a) El plato es el engranaje más grande que forma parte del sistema de transmisión, acompañando a la cadena y el piñón integrado a la rueda trasera. Asumiendo que no existen pérdidas por fricción seca y que las condiciones de lubricación del sistema de transmisión son óptimas tal que las pérdidas de potencia son despreciables. Además, supongamos que la bicicleta viaja a velocidad constante, entonces tenemos la siguiente identidad mediante las definiciones de trabajo y potencia:

$T_{P}\cdot \omega_{P} = T_{p}\cdot \omega_{p}$ (1)

Donde:

$T_{P}$ - Torque del plato, en newton-metros.

$T_{p}$ - Torque del piñón, en newton-metros.

$\omega_{p}$ - Rapidez angular del piñón, en radianes por segundo.

$\omega_{P}$ - Rapidez angular del plato, en radianes por segundo.

Sabiendo el hecho que tanto el plato y el piñón experimenta la misma velocidad tangencial, podemos simplificar (1) como sigue:

$\frac{T_{P}}{R_{P}} = \frac{T_{p}}{R_{p}}$ (1b)

Puesto que el radio de cada elemento y el número de dientes son, por separado, directamente proporcionales al número de dientes, modificamos (1b) así y tenemos la siguiente identidad, la cual equivale a su vez a la razón de desarrollo:

$\frac{T_{P}}{T_{p}} = \frac{N_{P}}{N_{p}} = \frac{R_{P}}{R_{p}} = \frac{\omega_{p}}{\omega_{P}}$ (1c)

Donde:

$N_{p}$ - Número de dientes del piñón, sin unidad.

$N_{P}$ - Número de dientes del plato, sin unidad.

Si tenemos que $r = 1,4$ y $N_{P} = 28$ , entonces tenemos que el número de dientes del piñón es:

$r = \frac{N_{P}}{N_{p}}$

$N_{p} = \frac{N_{P}}{r}$

$N_{p} = \frac{28}{1,4}$

$N_{p} = 20$

El piñón debe tener 20 dientes.

b) De acuerdo con la relación de desarrollo, por cada revolución realizada por el plato, el piñón realiza 1,4 revoluciones. Entonces, el avance realizado por la rueda trasera ( $s$ ), en metros, es igual al productor de la relación de desarrollo y la circunferencia de la rueda, es decir:

$s = r\cdot 2\pi\cdot R$ (1)

Donde $R$ es el radio de la rueda trasera, en metros.

Si conocemos que $r = 1,4$ y $R = 0,2\,m$ , entonces el avance realizado por la rueda trasera es:

$s = r\cdot 2\pi\cdot R$

$s = (1,4)\cdot (2\pi)\cdot (0,2\,m)$

$s \approx 1,759 \,m$

La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

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