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stepan [7]
3 years ago
11

Question about generators and electrical currents. Please, no absurd answers! Thank you

Physics
2 answers:
OverLord2011 [107]3 years ago
7 0
It’s the second one
Kamila [148]3 years ago
3 0
The first answer should be correct if not then the second one
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The pitch of a sound come from the frequency of the soundwave, soundwaves that have bigger frequencies sound with a high pitch and soundwaves with less frequencie have low pitch.
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3 years ago
Air at 27oC and 1 atm flows over a flat plate 40 cm in length and 1 cm in width at a speed of 2 m/s. The plate is heated over it
irga5000 [103]

Answer:

Heat transferred = 22.9 watt

Explanation:

Given that:

T_1 = 27°C = (273 + 27) K = 300 K

T_2= 600°C = (600 +273) K = 873 K

speed v = 2 m/s

length x = 40 cm = 0.4 cm

width = 1 cm = 0.001 m

The heat transferred from the plate can be calculate by using the formula:

Heat transferred = h×A ×ΔT

From the tables of properties of air, the following values where obtained.

k = 0.02476 \ W/m.k  \\ \\  \rho = 1.225 \ kg/m^3 \\ \\ \mu = 18.6 \times 10^{-6} \ Pa.s \\ \\ c_p = 1.005 \ kJ/kg

To start with the reynolds number; the formula for calculating the reynolds number can be expressed as:

reynolds number = \dfrac{\rho \times v \times x }{\mu}

reynolds number = \dfrac{1.225 \times 2 \times 0.4}{18.6 \times 10^{-6}}

reynolds number = \dfrac{0.98}{18.6 \times 10^{-6}}

reynolds number = 52688.11204

Prandtl number = \dfrac{c_p \mu}{k}

Prandtl number = \dfrac{1.005 \times 18.6 \times 10^{-6} \times 10^3}{0.02476}

Prandtl number = \dfrac{0.018693}{0.02476}

Prandtl number = 0.754963

The nusselt number for this turbulent flow over the flat plate  can be computed as follows:

Nusselt no = \dfrac{hx}{k} = 0.0296 (Re) ^{0.8} \times (Pr)^{1/3}

\dfrac{h \times 0.4}{0.02476} = 0.0296 (52688.11204) ^{0.8} \times (0.754968)^{1/3}

\dfrac{h \times 0.4}{0.02476} =161.4252008}

h  =\dfrac{161.4252008 \times 0.02476}{ 0.4}

h = 9.992 W/m.k

Recall that:

The heat transferred from the plate can be calculate by using the formula:

Heat transferred = h×A ×ΔT

Heat transferred = h\times A \times (T_2-T_1)

Heat transferred = 9.992 × (0.4 × 0.01) ×(873-300)

Heat transferred = 22.9 watt

6 0
3 years ago
Acid rain is the direct result of acid released by burning fossil fuels. T/F
disa [49]

Answer : False.

Explanation : Acid rain is the indirect result of burning fossil fuels. As the incomplete combustion of fossil fuels releases sulfur dioxide and nitrous dioxide in the air. When it rains it gets mixed with water and forms nitric acid and sulfuric acid which causes acid rain. Acid rain is harmful.

7 0
3 years ago
Read 2 more answers
raising the temperature of a gas will increase its pressure If which of the following happens the volume is increased but the nu
Nadusha1986 [10]
D, as the others will result in the likelihood of the particles colliding decreasing

Hope it helps))

3 0
3 years ago
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