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3 years ago

is the thermal energy transferred in a refrigerator primarily by conduction,convection or radiation? explain your answer

Physics

1 answer:

irinina [24]3 years ago

6 0

Answer: Convection

Explanation: convection is the most present process in the refrigeration equipment you may deal with. It occurs mainly in the fluids

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72) What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of Ca(NO3)2 (formula weight = 164 g/mol) in 115

Rina8888 [55]

<u>Answer:</u> The freezing point of solution is -3.34°C

<u>Explanation:</u>

Vant hoff factor for ionic solute is the number of ions that are present in a solution. The equation for the ionization of calcium nitrate follows:

$Ca(NO_3)_2(aq.)\rightarrow Ca^{2+}(aq.)+2NO_3^-(aq.)$

The total number of ions present in the solution are 3.

To calculate the molality of solution, we use the equation:

$Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}$

Where,

$m_{solute}$ = Given mass of solute $(Ca(NO_3)_2)$ = 11.3 g

$M_{solute}$ = Molar mass of solute $(Ca(NO_3)_2)$ = 164 g/mol

$W_{solvent}$ = Mass of solvent (water) = 115 g

Putting values in above equation, we get:

$\text{Molality of }Ca(NO_3)_2=\frac{11.3\times 1000}{164\times 115}\\\\\text{Molality of }Ca(NO_3)_2=0.599m$

To calculate the depression in freezing point, we use the equation:

$\Delta T=iK_fm$

where,

i = Vant hoff factor = 3

$K_f$ = molal freezing point depression constant = 1.86°C/m.g

m = molality of solution = 0.599 m

Putting values in above equation, we get:

$\Delta T=3\times 1.86^oC/m.g\times 0.599m\\\\\Delta T=3.34^oC$

Depression in freezing point is defined as the difference in the freezing point of water and freezing point of solution.

$\Delta T=\text{freezing point of water}-\text{freezing point of solution}$

$\Delta T$ = 3.34 °C

Freezing point of water = 0°C

Freezing point of solution = ?

Putting values in above equation, we get:

$3.34^oC=0^oC-\text{Freezing point of solution}\\\\\text{Freezing point of solution}=-3.34^oC$

Hence, the freezing point of solution is -3.34°C

4 0

4 years ago

(02.03 LC)

guapka [62]

Ina vacuum, it is a constant value that does not depend on the observer.

8 0

3 years ago

Read 2 more answers

Question 11 (3 points)

kykrilka [37]

Answer:

С. 10.41 Ampere

Explanation:

Given that,

Power, P = 125 watts

Voltage, V = 12 volts

We need to find current. Power in terms of current and voltage is given by :

P = VI, I = current

$I=\dfrac{P}{V}\\\\I=\dfrac{125\ W}{12\ V}\\\\I=10.41\ A$

So, the current is 10.41 A.

5 0

3 years ago

A Chinook salmon can swim underwater at 3.75 m/s, and it can also jump vertically upward, leaving the water with a speed of 6.20

Olin [163]

Answer:

P = 2161 N

Explanation:

For this exercise, let's start with Newton's second law

P - W = m a

P = ma + W

Where P is the fin force, W the weight,

Let's look for the vertical acceleration of the fish, this goes from a vertical speed of zero to a speed of 6.20 m / s when it has traveled half its length 1.50

y = 0.75 m

v² = v₀ + 2 a y

a = v² / 2 y

a = 6.20²/2 0.75

a = 25.63 m / s

We substitute in Newton's second law

P = m (g + a)

Let's calculate

P = 61.0 (0 9.8 + 25.63)

P = 2161 N

5 0

3 years ago

9/16/20: In one accident, two cars are traveling with a speed of 40 miles per hour and they crash into each other. In a

andrew-mc [135]

I don’t understand the question I’m really sorry:/.

5 0

3 years ago