Answers
Answer:
According to Figure 3, to purchase and install a wind turbine costs $50,000, while to purchase and install a hyrdroelectric generator costs $20,000. The hyrdroelectric generator is relatively cheaper compared to the wind turbine. While the hydroelectric generator is cheaper, it only produces 8 kilowatts of constant power output, and, on the other hand, the wind turbine produces an average of 10 kilowatts of power output. The hydroelectric generator processes constant power output, while the wind turbine processes varying power outputs, with an average of 10 kilowatts.
Answer:
wind turbines r better than hydroelectric generators
Explanation:
Related Questions
What is the major source of energy on Earth? Group of answer choices a.photosynthesis b.fossil fuels c.EM waves from the sun d.
plants that are used for food.
Answers
Answer:
Em waves from the sun d
Explanation:
Answer:
The answer is photosynthesis
Explanation:
calculate the pressure exerted on the floor when an elephant who weighs 2400N stands on one foot which has an area of 0.4m squared
Answers
Answer:
6000pa
Explanation:
force= 2400N
area= 0.4m
pressure=?
now,
p= f/a
p= 2400/ 0.4
therefore,P=6000 pa.
If the voltage of a circuit is 6V, and the power is 4W, what is its resistance?
Answers
Answer:
9 ohms
Explanation:
P = V²/R
R = v²/p = 6²/4 = 36/4 = 9 ohms.
The resistance is 9 Ohm.
To find the resistance, we need to know about the power in term of resistance and voltage.
What is the value of power in terms of resistance and voltage?We know that power=work/timeElectrostatics work is given as voltage ×charge. So, power=(Voltage×charge)/timeAgain, charge/time is given as current. So, power = Voltage×currentFrom Ohm's law, we know that current=voltage/resistance. So, power= voltage ²/resistance. What is the resistance, if power is 4W and voltage is 6V?Resistance in term of power and voltage is given as Resistance= voltage ²/powerSo, resistance=6²/4=36/4= 9 OhmThus, we can conclude that the resistance is 9 Ohm.
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The electromagnetic spectrum is divided into regions by Group of answer choices a.wavelengths and frequencies b.the way they are used c.speed d.colors
Answers
Answer:
Generally, by wavelengths and frequencies.
Colors only occur for a narrow portion of the spectrum.
The speed for these waves is c the speed of light regardless of wavelength.
The way they are used seems somewhat irrelevant.
The electromagnetic spectrum is divided into regions by wavelengths and frequencies. The spectrum is arranged in the order of increasing frequency.
What is electromagnetic spectrum ?The electromagnetic spectrum is the arrangement of waves in the order increasing frequency or decreasing wavelength. The order of the spectra starts from radio waves, microwaves, infrared, visible light, ultraviolet, x -rays and gamma rays.
The visible light that we can see is in between IR and UV rays. Hence, visible light has a frequency greater than IR rays but shorter than IR. Similarly visible light is longer than UV- rays but less frequency than UV rays.
Gamma rays are the most energetic and shorter waves in the electromagnetic spectrum with smaller wavelength and greater frequency. Hence, options a is correct.
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Difference between crest and trough
Answers
Answer:
The highest surface part of a wave is called the crest, and the lowest part is the trough. The vertical distance between the crest and the trough is the wave height. The horizontal distance between two adjacent crests or troughs is known as the wavelength.
I hope it's helpful!
Problem 1. A 70-kg person standing on a frictionless platform of ice throws a football
forward with a velocity of 12m/s. If the person moves backward (sliding) with a velocity of
34cm/s, what is the mass of the football?
Problem 2. A car traveling at 8m/s crashes into a car of identical mass stopped at a traffic
light. What is the velocity of the wreckage immediately after the crash, assuming that the
cars stick together?
Problem 3. A 30-kg child stands on a frictionless surface. Th father throws a 0.8-kg football
with a velocity of 15m/s. What velocity will the child have after catching the football?
Problem 4. A billiard ball moving to the left at 30 cm/s collides head with another ball
moving to the right at 20cm/s. The masses of the balls are identical. If the collision is
perfectly elastic, what is the velocity of the first ball after impact if velocity of the second
ball is 4cm/s toward the right?
Problem 5. Two metal balls A and B are suspended, as shown in the figure, so that each
touches the other. The masses are given in the figure. Ball A is pulled to the initial side until it
is 12 cm above its initial position, and then it is released. If it strikes ball B in a completely
elastic collision, find the height h reached by ball B assuming zero friction.
Answers
Answer: The answer is in your heart
Explanation: I don't know, just trust °_°
It depends on the location on the periodic table and if it is easier to loose are gain electrons to fill the valence electron shell.
What is the electron affinity?The electron affinity of the neutral atom of the element can show indicate whether or not the element is going the make positive or negative ions. The higher the electron affinity is, the more the neutral atom wants to gain electrons.
The electron affinity for alkali metals and alkaline earth metals are low due to the fact that they are located on the left of the periodic table and only needs to loose 1 or 2 electrons to have a completed valence shell.
That means that they want to form cations (loose electrons). Halogens have a high electron affinity since they are located on the right of the periodic table and only have to gain 1 electron to get a completed valence electron configuration. That means that it forms anions.
Therefore, It depends on the location on the periodic table and if it is easier to loose are gain electrons to fill the valence electron shell.
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compare the liquid pressure at the surface of a swimming pool and the bottom of the swimming pool
Answers
Answer:
The pressure difference is equal to the product of density , height and g
Given that h is height difference between bottom and surface of a pool
P
b
−P
s
=dgh
Density d of water is 1
So we get P
b
−P
s
=gh
Therefore option A is correct
Explanation:
Why does mercury have the least gravitational pull?
Answers
An atom y has 11 eleven protons 12 neutrons what is the number of electrons in it
Answers
Answer:
Electrons = 11
Explanation:
The amount of protons is = to the amount of electrons
What are the half lives for uranium-235 and uranium-238?
a.
The half-life of uranium-235 is 713 seconds, the half-life of uranium-238 is 4.5 minutes
c.
The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years
b.
The half-life of uranium-235 is 713 days, the half-life of uranium-238 is 450 days
d.
None of the above
Answers
Answer:
C. The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years
What causes a liquid to freeze? A. When particles speed up and get closer together. B. When particles stop moving. C. When particles slow down and get closer together. D. When particles speed up and get farther apart.
Answers
Answer:The answer is C
Explanation:
9. When we see the color of an object it absorbs all of the light colors except? _________________
The color it reflects The color it absorbs White light
Answers
it absorbs all ligj colour except black
5
Drag each tile to the correct box.
Adam takes a bus on a school field trip. The bus route is split into the five legs listed in the table. Find the average velocity for each leg of the trip.
Then arrange the legs of the trip from highest velocity to lowest:
Leg Distance (km) Time (min)
A 18
9
B 25
15
C С 24
8
D
48
12
E
15
7
leg A
leg B
leg C
leg D
leg E
Reset
Next
Answers
2) C
3) E
4) A
5) B
Answer:
1) D
2) C
3) E
4) A
5) B
Explanation:
Hope this help!
what to do if i am kidnapped right now pls help im screaming pls pls pls alot of points
Answers
Answer:
call the police, or scream on the top of ur lungs. and fight for ur life.
Explanation:
Answer:
Try to put your finger prints over EVERYTHING and try to remember EVERY SURROUNDING YOU SEE, try to put strands of your hair all over wherever you are. Try to poison whoever kidnaped you (ik kind of far but STILL). Just please if you actually ARE being kidnapped, SCREAM AND RUN JUST RUN AS FAST AS YOU CAN IF U AREN'T TIED UP OR WHATEVER. :(
Will the gravitational force between 2 objects increase or decrease if the distance between them decreases.
Answers
Answer:
increase
Explanation:
The formula for the gravitation for of attraction is:
[tex]F = \dfrac{Gm_1m_2}{r^2}[/tex]
It implies that the force of attraction is inversely proportional to the square of the distance. i.e.
[tex]F \infty \dfrac{1}{r^2}[/tex]
where;
G = gravitational constant
m = mass; &
r = distance between the two objects.
Now let's assume that the distance between is reduced from 1 to half;
Then:
[tex]F \infty \dfrac{1}{\Big (\dfrac{r}{2} \Big)^2}[/tex]
[tex]F \infty \dfrac{4}{r^2}[/tex]
Thus, the new gravitational force of attraction increased by a factor of 4.
Blake strikes a punching bag with 80N of force for 0.05 seconds. John strikes a
punching bag with 60N of force for 0.1 second. Who delivers a greater amount of
impulse?
Answers
Answer:
So impulse= force × timeP1= 80N× 0.05 = 4 P2= 60N × 0.1= 6 Hence John delivers a greater impulse I do exams and quizzes if your interesteda dolphin that just manage to keep up with a speeding boat for a distance of 2km for a period of 3h in (answer in km/h)
Answers
Answer:
6km
Explanation:
3hours X 2km = 6 kilometres
A wave hits an object as shown. A vertical line with Medium 1 to the left and Medium 2 to the right. An arrow from the left reaches the line. An arrow starts from the same point on the line and goes right at a different angle. Which kind of wave interaction is shown?
Answers
Answer:
refraction
Explanation:
When the wave moves from medium 1 to medium 2, then the wave gets refracted. Then the correct option is C.
What is the wave?A wave is an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.
A wave is a dynamic disturbance of one or more variables that propagates in physics, geometry, and related sciences. When waves oscillate frequently around an equilibrium value at a certain frequency, they are said to be periodic.
The bending of waves as they go from one substance to another is known as wave refraction. It bends when the wave enters a new material because the wave's speed changes. The optical density or index of refraction of the material affects how light waves bend.
Thus, the correct option is C.
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The missing options are given below.
absorption
diffraction
refraction
reflection
uses of electromagnetic wave
Answers
Microwaves - used for cooking food and for satellite communications
Infrared light - used by electrical heaters and infrared cameras
Ultraviolet radiation - kills bacteria - sterilises water and makes it safe to drink and produces vitamin D - good for skin
How much mass can be lifted by a weight lifter on the surface of the moon if he can lift 100 kg on the Earth?
Answers
Answer:
if u have to find mass then it always constant everywhere that is 100kg but if u have to find weight then it 1/6 of earth .
Explanation:
16.6666
Which object has the most kinetic energy? A. Object 1 B. Object 2 C. Object 3 D. Object 4
Answers
Answer:
the answer is A because it has the least number but high in energy
If Steve races on the highway going south for 2430 meters in 40 seconds what is his velocity?
Answers
Answer: 60.75 m/s
Explanation:
2430 m / 40s = 60.75 m/s
work out
A rectangular block of mass 20 kg lies with a side 0.2m by 500cm on a tab
What is the pressure exerted by its weight on the table?
Answers
Explanation:
force/area=pressure
force=10*mass
area=0.2*500
pressure=200/100=2
15. Which of the following is the correct electron configuration for neon (10Ne)?
A. 1s 2s22p
C. 184 2s2 3s2 2p?
B. 1s 2s2 3s2 2p4
D. 152 282 3s2p5
Answers
Answer:
1s2,2s2,2p6 or (He) 2s2 2p6
14. If 100 grams of sodium nitrate are dissolved in 100 grams of water
at 60 degrees C, is the solution formed saturated, unsaturated, or
supersaturated?
Answers
Answer:
Unsaturated
Explanation:
the solubility of sodium nitrate is at 60 C is 124g/ml therefore, putting 100 grams will not saturate fully.
Which of the following waves has the longest wavelength? Group of answer choices a.ultraviolet b.gamma c.visible light d.microwaves
Answers
Answer: visible light
Explanation:
13-1 LIVE
2, A rectangulv Container of base socmby 30cm is filled
with water to be depth of 5cm. how much is the pressure exerted
at the base? (take pw= 1000kg /m3 and g=10m/s)
Answers
Correct question is;
2, A rectangular Container of base 50 cm by 30cm is filled with water to be depth of 5cm. how much is the pressure exerted at the base? (take pw= 1000kg /m3 and g=10m/s)
Answer:
P = 500 N/m²
Explanation:
Pressure exerted at the base is the hydrostatic pressure and it is given by the formula;
P = ρgh
Where;
ρ is density = 1000 kg/m³
g = 10 m/s²
h is depth = 5 cm = 0.05 m
Thus;
P = 1000 × 10 × 0.05
P = 500 N/m²
How are humidity and precipitation related?
A. When humidity is low, the chance of precipitation is high.
b.When humidity is high, the chance of precipitation is high.
c.When humidity is high, the chance of precipitation is low.
d.Changes in humidity do not cause precipitation.
Answers
Answer:
Relative humidity depends on the amount moisture actually in the air at some temperature to the amount of moisture that the air can hold.
For instance, at 25 deg C the air has a saturation pressure of 23.76 mm of Hg.
That means that if at that temperature the pressure of the water vapor in the air reaches 23.76 mm Hg then the air is 100% saturated.
I believe the standard air pressure at 25 deg C is 760 mm Hg.
Now if the pressure of the water vapor in the air is 1/2 * 23.76 = 11.88 mm then the air is 50% saturated and the relative hunidity is 50 %.
At 100% relative humidity rain occurs (the air can't hold any more water).
When humidity is high, the chance of precipitation is high. The correct answer is b. When humidity is high, the chance of precipitation is high.
The amount of moisture or water vapor in the air is referred to as humidity. Relative humidity is a common way to measure it since it shows how much moisture the air is holding relative to how much it could contain at a particular temperature.
Any type of water that falls from the atmosphere and makes it to the surface of the Earth is referred to as precipitation. Examples include rain, snow, sleet, and hail.
When humidity levels are high, there is a lot of moisture in the air, which increases the possibility that saturation will occur. Excess water vapor condenses into visible water droplets or ice crystals as the air gets saturated, creating clouds. Condensed moisture in the clouds eventually gains enough weight to return to Earth as precipitation.
Therefore, when humidity is high, the chance of precipitation is high. The correct answer is:
b. When humidity is high, the chance of precipitation is high.
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what is ionisation?
Answers
Answer: Ionisation is the process of an atom gets a negative or a positive charge by gaining or losing electrons. The result is an ion.
Explanation: Thats why
Which two charges of a magnet will attract?
Answers
Answer:
The other end is called the south pole. When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges.
Explanation:
Answer: A magnet has two ends called poles the answer are the poles
North pole and South pole
Explanation:
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