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3 years ago

A 15 kg box is accelerated from 15m/s to 30 m/s in 36 seconds. What is the net force exerted on the box?

1 answer:

8 0

Acceleration = (change in speed) / (time for the change)

Acceleration = (30 m/s - 15 m/s) / (36 sec) =

(15 m/s) = (36 sec) = 5/12 m/s²

Force = (mass) x (acceleration)

Force = (15 kg) x (5/12 m/s²) =<em> 6.25 newtons</em> (about 1.4 pounds)

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What is the main difference between velocity and speed?

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Speed is scalar, meaning it's only going to be like 74 mph, doesn't matter which direction. Velocity is a vector, meaning it has direction. You can go -74mph when talking about velocity, not speed.

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3 years ago

According to Newton's third law, which describes what happens when a 4.5 kg pumpkin is launched from a catapult with a force of

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3 years ago

Una bola de 1 kg gira alrededor de un circulovrtical en el extremo de un cuerda. El otro extremo de la cuerda esta fijo en el ce

Vladimir79 [104]

Answer:

La diferencia entre las tensiones máxima y mínima es de 19.614 newtons.

Explanation:

Puesto que la bola gira en un círculo vertical, existe claramente una diferencia entre las tensiones debido a la influencia de la gravedad y la tensión que resulta de la aceleración centrípeta experimentada por la masa. La máxima tensión ocurre cuando la bola se encuentra en el nadir (o la sima) del trayecto circular, la cual se describe por la Segunda Ley de Newton:

$T_{max} - m\cdot g = m\cdot \frac{v^{2}}{L}$

En cambio, la mínima tensión aparece cuando la bola se encuentra en el cénit (o la cima) del trayecto circular, descrita por la misma ley de Newton:

$T_{min} + m\cdot g = m\cdot \frac{v^{2}}{L}$

Donde:

$T_{min}$ , $T_{max}$ - Tensiones mínima y máxima, medidas en newtons.

$m$ - Masa de la bola, medida en kilogramos.

$g$ - Constante gravitacional, medida en metros por segundo al cuadrado.

$L$ - Distancia con respecto al eje de rotación, medida en metros.

$v$ - Rapidez tangencial, medido en metros por segundo.

Se elimina la aceleración centrípeta de ambas expresiones por igualación:

$T_{min} + m\cdot g = T_{max} - m\cdot g$

Ahora, la diferencia entre las tensiones máxima y mínima es:

$T_{max} - T_{min} = 2\cdot m \cdot g$

Si $m = 1\,kg$ y $g = 9.807\,\frac{m}{s^{2}}$ , entonces:

$T_{max} - T_{min} = 2\cdot (1\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)$

$T_{max}-T_{min} = 19.614\,N$

La diferencia entre las tensiones máxima y mínima es de 19.614 newtons.

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3 years ago

List the laws of thermodynamic and describe their relevance in the chemical reactions2. Define the standard reduction potential.

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<h2>Energy remains constant </h2>

Explanation:

Thermodynamic Laws -

The primary law, otherwise called the Law of Conservation of Energy, expresses that energy remains constant in the overall reaction, it is not created or destroyed.

The second law of thermodynamics expresses that the entropy increases. after the completion of the reaction of any isolated system

The third law of thermodynamics expresses that as the temperature reaches towards an absolute zero point the entropy of a system becomes constant.

Standard Electronic potential -

The standard reduction potential may be defined as the tendency of a chemical species or the reactants to get into its reduced form after the overall reaction.

It is estimated at volts.

The more is the positive potential the more is the reduction of the chemical species

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3 years ago

Latent heat of fusion definition and explanation

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Answer:

The enthalpy of fusion of a substance, also known as heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

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4 years ago