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3 years ago

Why is respiration an exothermic reaction?

Physics

2 answers:

miv72 [106K]3 years ago

6 0

Answer:

A. a large amount of energy is released into its surroundings

Explanation:

i am very sure i study very well and if u are on plato the correct answer is A

Bess [88]3 years ago

3 0

A. a large amount of energy is released into its surroundings

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The surface of an incline is coated with an experimental substance that is intended to reduce the frictional force between a blo

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A/an ___ is a machine which tells us about the strength and speed of sisemec waves.

svp [43]

The answer is Seismograph

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You throw a ball into the air. Which two forces cause the ball to gradually stop moving upward and then fall back to Earth?

Virty [35]

Answer:

I'm pretty sure the answer is D

Explanation:

Honestly it's just a guess so let me know if it's right :3

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3 years ago

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Copper has a specific heat of 0.09 cal/g x C . How much change in temperature would the addition of 8373 cal of heat have on a 5

neonofarm [45]

<h3>Answer:</h3>

172.92 °C

<h3>Explanation:</h3>

Concept being tested: Quantity of heat

We are given;

Specific heat capacity of copper as 0.09 cal/g°C
Quantity of heat is 8373 calories
Mass of copper sample as 538.0 g

We are required to calculate the change in temperature.

In this case we need to know that the amount of heat absorbed or gained by a substance is given by the product of mass, specific heat capacity and change in temperature.

That is, Q = m × c × ΔT

Therefore, to calculate the change in temperature, ΔT we rearrange the formula;

ΔT = Q ÷ mc

Thus;

ΔT = 8373 cal ÷ (538 g × 0.09 cal/g°C)

= 172.92 °C

Therefore, the change in temperature will be 172.92 °C

3 0

3 years ago

Que fuerza se obtendrá en el émbolo mayor de una prensa hidraúlica cuya área es de 167 cm2, cuando el émbolo menor de área igual

stiv31 [10]

Responder:

Explicación:

Según el principio pascal, establece que la presión aplicada en un punto sobre un líquido en un recipiente cerrado es igual a igual a la presión en cualquier otro punto del líquido.

Matemáticamente Presión ejercida por el pistón más pequeño = Presión ejercida por el pistón más grande.

La presión es la relación entre la fuerza y su área de sección transversal.

P = Fuerza / Área de sección transversal

Sea P1 la presión sobre el pistón más pequeño y P2 la presión ejercida por el pistón más grande.

Como P1 = P2 entonces;

F1 / A1 = F2 / A2

Dado F1 = 450N, A1 = 14 cm², A2 = 167 cm² y F2 =?

Sustituyendo el valor conocido en la fórmula para obtener el requerido, tenemos;

$\frac{450}{14} = \frac{F2}{167}\\ \\Cross\ multiplying\\\\14*F_2 = 450*167\\\\14F_2 = 75,150\\\\F_2 = \frac{75,150}{14} \\\\F_2 = 5,367.9N$

$F_2 \approx 5, 368N$

Por lo tanto, la fuerza que se obtendrá en el pistón más grande de una prensa hidráulica cuya área es de 167 cm² es aproximadamente 5,368N,

4 0

3 years ago