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3 years ago

Which of the following best describes a central idea of the text?

Engineering

1 answer:

GREYUIT [131]3 years ago

6 0

Answer:

i think is B

Explanation:

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A dual voltage/dual resistance AC hair dryer can be used with a 120 V or 230 V power supply. A switch allows the user to set the

NISA [10]

Answer:

The power is $p= 5621 W$

Explanation:

In order to obtain the power it consumes we need to first obtain the resistance of the hair dryer at 120 V

$R = \frac{V^2}{P} = \frac{(120 V)^2}{1530W} = 9.411 \Omega$

Now the power supplied in Europe at their voltage of 230V would be

$P = \frac{V^2} {R} = \frac{(230V)^2}{9.411 \ \Omega} = 5621 W$

Looking the power obtain we see that it is higher than 1530 W so this would cause the dryer to smoke.

3 0

4 years ago

Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -16oC and a quality of 20% at a ve

Dmitry [639]

Answer:

mass flow rate = 0.0534 kg/sec

velocity at exit = 29.34 m/sec

Explanation:

From the information given:

Inlet:

Temperature $T_1 = -16^0\ C$

Quality $x_1 = 0.2$

Outlet:

Temperature $T_2 = -16^0 C$

Quality $x_2 = 1$

The following data were obtained at saturation properties of R134a at the temperature of -16° C

$v_f= 0.7428 \times 10^{-3} \ m^3/kg \\ \\ v_g = 0.1247 \ m^3 /kg$

$v_1 = v_f + x_1 ( vg - ( v_f)) \\ \\ v_1 = 0.7428 \times 10^{-3} + 0.2 (0.1247 -(0.7428 \times 10^{-3})) \\ \\ v_1 = 0.0255 \ m^3/kg \\ \\ \\ v_2 = v_g = 0.1247 \ m^3/kg$

$m = \rho_1A_1v_1 = \rho_2A_2v_2 \\ \\ m = \dfrac{1}{0.0255} \times \dfrac{\pi}{4}\times (1.7 \times 10^{-2})^2\times 6 \\ \\ \mathbf{m = 0.0534 \ kg/sec}$

$\rho_1A_1v_1 = \rho_2A_2v_2 \\ \\ A_1 =A_2 \\ \\ \rho_1v_1 = \rho_2v_2 \\ \\ \implies \dfrac{1}{0.0255} \times6 = \dfrac{1}{0.1247}\times (v_2)\\ \\ \\\mathbf{\\ v_2 = 29.34 \ m/sec}$

3 0

3 years ago

About ceramics: Generally are hard and brittle. a) True b)-False

aniked [119]

Answer:

true

Explanation:

8 0

3 years ago

The technique of smoothing out joint compound on either side of a joint is known as which of the following

Black_prince [1.1K]

Answer:

a is the answer to your questions

3 0

3 years ago

Technician A says that reinforcements may be made of plastic,

lord [1]

Answer:

A Only

Explanation:

Reinforcements, as the name suggests, are used to enhance the mechanical properties of a plastic. Finely divided silica, carbon black, talc, mica, and calcium carbonate, as well as short fibres of a variety of materials, can be incorporated as particulate fillers.

3 0

3 years ago