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3 years ago

What might cause birds in population to immigration To the island

Engineering

2 answers:

loris [4]3 years ago

7 0

Mass forest destruction

temperatures

LekaFEV [45]3 years ago

6 0

Answer:

the instructions of their ecosystems

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List 5 characteristics of metal?

RSB [31]

Answer:

- Son buenos conductores de electricidad.

- Excelentes conductores de calor.

- Tienen una alta tenacidad.

- Se encuentran en estado solido, exepto por el mercurio.

- Y se destaca la baja electronegatividad.

3 0

3 years ago

Even when you have the right-of-way, you're responsible for _____ before you drive forward.

Mazyrski [523]

Answer: look left to right twice b/c somebody may try to run the light

Explanation:

3 0

3 years ago

Read 2 more answers

A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. A small fan pulls

Iteru [2.4K]

Answer:

% increase = 26.32%

Explanation:

From conservation of mass, we can say that;

Mass flow rate at inlet = mass flow rate at exit.

Thus;

m'1 = m'2

Formula for mass flow rate is;

m' = ρV'

Where V' is volumetric flow rate = Av

Thus;

m' = ρAv

Where;

ρ is density

A is area

v is velocity

Therefore from m'1 = m'2, we can say that;

ρ1•A1•v1 = ρ2•A2•v2

Since the duct has a constant diameter, then A1 = A2

Thus, we now have;

ρ1•v1 = ρ2•v2

Making v2 the subject, we have;

v2 = ρ1•v1/ρ2

Now, since we want to find the percent increase in the velocity of the air as it flows through the dryer,we would use;

% increase = ((v2 - v1)/v1) × 100%

We have v2 = ρ1•v1/ρ2

Thus;

% increase = ((ρ1•v1/ρ2) - v1)/v1) × 100%

Factorizing v1 out, we have;

% increase = ((ρ1/ρ2) - 1)/1) × 100%

We are given;

ρ1 = 1.2 kg/m³

ρ2 = 0.95 kg/m³

Thus;

% increase = ((1.2/0.95) - 1)/1) × 100%

% increase = 26.32%

8 0

3 years ago

2. What is the charge, expressed in micro coulombs on two equally and similarly charges spheres placed in air with their centres

9966 [12]

Answer:

q = 0.1086 micro Coulombs

Explanation:

By Coulombs law, we have;

$F =k \times \dfrac{ q_1 \times q_2}{r^2}$

Where;

F = The electric force = 120 mgm

q₁ and q₂ = Charge

r = The separating distance = 30 cm = 0.3 m

k = 8.9876×10⁹ kg·m³/(s²·C²)

Where, q₁ and q₂, we have;

$F =k \times \dfrac{ q^2}{r^2}$

Whereby the force is the force of 120 milligram mass, we have;

0.00012 × 9.81 = 000011772 N

$q = \sqrt{ \dfrac{ F\times r^2}{k}}$

Substituting the values, we have;

$q = \sqrt{ \dfrac{ 000011772 \times (0.3)^2}{8.9876 \times 10^9}} = 1.086 \times 10 ^{-7} \ Coulombs$

q = 0.1086 micro Coulombs.

5 0

3 years ago

Air enters the compressor of a regenerative gas-turbine engine at 300 K and 100 kPa, where it is compressed to 800 kPa and 580 K

Bad White [126]

Answer:

a) The amount of heat transfer in the regenerator, q = 114.12 kJ/kg

b) Thermal efficiency = 35.9%

Explanation:

The calculations are neatly handwritten and attached as files to this solution for easiness of expression and clarity. The cycle is also drawn on the T - S diagram and included in the attached files. Check the files below for the complete calculation.

I hope this helps!

3 0

3 years ago