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3 years ago

8

A town is considering building a biodiesel power plant that would burn biomass to generate electricity. Which of the following c

orrectly lists an advantage and a disadvantage of this project?
Advantage: it could help get rid of unwanted waste. Disadvantage: there is no way to use the electricity created.
Advantage: it reduces dependence on fossil fuels. Disadvantage: it would emit pollution into the air.
Advantage: it is a commonly used energy source. Disadvantage: building the plant would attract new people to the area.
Advantage: it would use energy from the sun and wind. Disadvantage: it is a non-renewable source of energy.

2 answers:

krok68 [10]3 years ago

8 0

Answer:

B!

Explanation:

I took the test!

garik1379 [7]3 years ago

6 0

Answer:

i think its B

Explanation:

i found the answer on another website hope its the right answer :)

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(a) What is the minimum width of a single slit (in multiples of λ ) that will produce a first minimum for a wavelength λ ? (b) W

Kitty [74]

Answer:

The minimum value of width for first minima is λ

The minimum value of width for 50 minima is 50λ

The minimum value of width for 1000 minima is 1000λ

Explanation:

Given that,

Wavelength = λ

For D to be small,

We need to calculate the minimum width

Using formula of minimum width

$D\sin\theta=n\lambda$

$D=\dfrac{n\lambda}{\sin\theta}$

Where, D = width of slit

$\lambda$ = wavelength

Put the value into the formula

$D=\dfrac{n\lambda}{\sin\theta}$

Here, $\sin\theta$ should be maximum.

So. maximum value of $\sin\theta$ is 1

Put the value into the formula

$D=\dfrac{1\times\lambda}{1}$

$D=\lambda$

(b). If the minimum number is 50

Then, the width is

$D=\dfrac{50\times\lambda}{1}$

$D=50\lambda$

(c). If the minimum number is 1000

Then, the width is

$D=\dfrac{1000\times\lambda}{1}$

$D=1000\lambda$

Hence, The minimum value of width for first minima is λ

The minimum value of width for 50 minima is 50λ

The minimum value of width for 1000 minima is 1000λ

4 0

3 years ago

An airplanes lands with a velocity of +75 m/s and comes to a stop in 20 seconds. What is the acceleration of the airplane while

erma4kov [3.2K]

Answer:

The acceleration of the car, a = -3.75 m/s²

Explanation:

Given data,

The initial velocity of the airplane, u = 75 m/s

The final velocity of the plane, v = 0 m/s

The time period of motion, t = 20 s

Using the I equations of motion

v = u + at

a = (v - u) / t

= (0 - 75) / 20

= -3.75 m/s²

The negative sign indicates that the plane is decelerating

Hence, the acceleration of the car, a = -3.75 m/s²

7 0

3 years ago

Four point charges are placed at the corners of a square. Each charge has the identical value +Q. The length of the diagonal of

kvv77 [185]

Answer: $V_{net}=4\frac{kQ}{a}$

Explanation:

Given

charge on each Particle is Q

Length of diagonal of the square is 2a

therefore distance between center and each charge is $\frac{2a}{2}=a$

Electric Potential of charged Particle is given by

For First Charge

$V_1=\frac{kQ}{a}$

$V_2=\frac{kQ}{a}$

$V_3=\frac{kQ}{a}$

$V_4=\frac{kQ}{a}$

total Electric Potential At center is given by

$V_{net}=V_1+V_2+V_3+V_4$

$V_{net}=4\times \frac{kQ}{a}$

$V_{net}=4\frac{kQ}{a}$

7 0

3 years ago

Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 1.90 gallons of gasoline. Only 30% of the gasoline goes into usefu

Aleksandr [31]

Answer:

686.11 N

1.7733 gallons

Explanation:

$\eta$ = Efficiency = 30%

V = Volume of gasoline

E = Energy content of gasoline = $1.3\times 10^8\ J/gal$

F = Force

s = Displacement = 108000 m

v = Velocity

Work done is given by

$W=F\times s\\\Rightarrow F=\frac{W}{s}\\\Rightarrow F=\frac{VE\eta}{s}\\\Rightarrow F=\frac{1.9\times 0.3\times 1.3\times 10^8}{108000}\\\Rightarrow F=686.11\ N$

The force required to keep the car moving at a constant speed is 686.11 N

Here the force is directly proportional to speed

$\\\Rightarrow F=v$

$\\\Rightarrow \frac{F_1}{v_1}=\frac{F_2}{v_2}\\\Rightarrow F_2=\frac{F_1\times v_2}{v_1}\\\Rightarrow F_2=\frac{686.11\times 28}{30}\\\Rightarrow F_2=640.36\ N$

$W=F\times s\\\Rightarrow 0.3\times 1.3\times 10^8\times V=640.36\times 108000\\\Rightarrow V=\frac{640.36\times 108000}{0.3\times 1.3\times 10^8}\\\Rightarrow V=1.7733\ gal$

The gallons that will be used is 1.7733 gallons

7 0

3 years ago

Human impact on one system leads to changes in more of Earth’s systems. Please select the best answer from the choices provide

faust18 [17]

Answer;

The above statement is true

Human impact on one system leads to changes in more of Earth’s systems.

Explanation;

Events can occur naturally, such as an earthquake or a hurricane, or they can be caused by humans, such as an oil spill or air pollution. An event can cause changes to occur in one or more of the spheres, and/or an event can be the effect of changes in one or more of Earth's four spheres.

Human impact on one system leads to changes in more of Earth’s systems because things like carbon and methane emissions affect the environment, which affects all plant and animal life.

8 0

3 years ago

Read 2 more answers