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Aleks04 [339]
3 years ago
7

Un repartidor de comida rápida entrega una pizza a una casa que se encuentra a 20 km de distancia y se demora 20 minutos en lleg

ar. De vuelta a la pizzería vuelve más relajado y se demora media hora. ¿Cuál fue su velocidad media en el trayecto completo?
Physics
1 answer:
Alex_Xolod [135]3 years ago
6 0

Answer:

La velocidad media en el trayecto completo es 0.8 \frac{km}{minutos}.

Explanation:

La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello.

En otras palabras, la velocidad es una magnitud que relaciona el cambio de posición (o desplazamiento) con el tiempo.

La velocidad media resulta del cociente entre el desplazamiento seguido por un móvil y el  tiempo transcurrido que se emplea  para realizar dicho desplazamiento:

velocidad=\frac{desplazamiento}{tiempo}

En este caso, un repartidor de comida rápida entrega una pizza a una casa que se encuentra a 20 km de distancia y se demora 20 minutos en llegar. De vuelta a la pizzería vuelve más relajado y se demora media hora. Entonces, el desplazamiento total entre la pizzería y la casa será 40 km, considerando que se dirige a la casa y vuelve a la pizzería.

Por otro lado, el tiempo total será el tiempo en que se dirige a la casa y luego vuelve a la pizzería, es decir 20 minutos + 30 minutos= 50 minutos.

Entonces:

velocidad=\frac{40 km}{50 minutos}

Resolviendo:

velocidad= 0.8 \frac{km}{minutos}

<u><em>La velocidad media en el trayecto completo es 0.8 </em></u>\frac{km}{minutos}<u><em>.</em></u>

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3 years ago
You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4 NN . If you t
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Answer:

2491.23 kg/m³

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From Archimedes principle,

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Making D the subject of the equation,

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Given: W = 28.4 N, U = lost in weight = weight in air- weight in water

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<span>So for example if you fill a bucket with water and you drop a stone in that bucket, if you measure the weight of the water that overflows from the bucket due to the stone being dropped into the bucket is equivalent to the pushing force that the water has on the stone (as the stone drops to the bottom of the bucket the water is pushing it to stay afloat but the rock is more dense than water and as such its downthrust exceeds water's upthrust).</span>


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