Explanation:
It is given that,
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s
The average height of the falls is 50 m
We need to find the power of Niagara Falls.
The gravitational potential energy of falling water is given by :
P = mgh
Power is rate of doing work i.e.
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{m}{t}\times gh[/tex]
We have, m/t = 2,400,000 kg/s
So,
[tex]P=2400000\times 9.8\times 50\\\\P=1.176\times 10^9\ W[/tex]
If the number of bulbs are n that could power 15 W LED, the,
[tex]n=\dfrac{1.176\times 10^9}{15}\\\\n=78400000\ \text{bulbs}[/tex]
1. What is the mass of 5.05 mL of air if the density of air is 1200.0 g/mL?
Answer:
mass=?,volume=5.05,density=1200.
density=mass/volume.
1200=mass/5.05.
mass=1200×5.05=6060g
Answer:
[tex]\huge \boxed{\mathrm{6060 \ grams}}[/tex]
Explanation:
[tex]\sf \displaystyle density = \frac{mass}{volume}[/tex]
[tex]\sf \displaystyle 1200 = \frac{m}{5.05}[/tex]
Multiplying both sides by 5.05.
[tex]\sf \displaystyle 1200(5.05) = \frac{m}{5.05}(5.05)[/tex]
[tex]\sf 6060=m[/tex]
The mass of the air is 6060 grams.
what is the chemical formula of ammonium sulphate
Answer:
(NH∨4)∨2SO∨4
Explanation: The ∨ just means that the number is written small and not big
Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model. In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included . For centuries, this was the accepted model. During the Renaissance, Nicholas discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the .
Answer:
the first blank is epicycle.
the second blank is Copernicus
the third blank is earth
In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.
What is Heliocentric Model?The heliocentric theory of the Solar System (aka, the heliocentric model) is a theory that places the Sun at the center of the Solar System. It also maintains that the Earth revolves around the Sun.
This theory was first proposed by Nicolaus Copernicus.
Copernicus was the first to propose a theory which differed from Ptolemy's Geocentric System, according to which the earth is at rest in the center with the rest of the planets revolving around it. The claim that all planets revolve around the sun had been raised in ancient times, but Copernicus was the first to succeed in describing the movements of the planets using an astronomical theory which placed the sun at the center.
Therefore, In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.
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To create an ion you simply need to add or take away an electron true or false
Answer:
True
Explanation:
ion: an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells. When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions.
Which statement provides a reason why a scientific theory could change? * 1 point O scientists repeat the experiments associated with the theory O scientists find new evidence that does not fit the theory O the theory is published in a scientific journal O the theory is over 100 years old
Answer:
B. Experiments test the scientists' ideas.
Explanation:
Experiments helps scientist test the ideas.
Experiment is simply an act of performing a controlled test about an idea.
Before an experiment is made, observations using senses must be deduced from the environment at first.
Observations leads to the formulation of hypothesis.
Hypothesis are more or less a scientific predictions.
Most hypothesis presents variables that can be tested.
The test of a hypothesis is an experiment.
Experiments help us makes controlled test about a scientific observation in a laboratory.
The second option!
I hope this helps!
Which of the following correctly describes a compound? (4 points)
The atoms are chemically bonded together, and they retain their individual physical and chemical properties.
The atoms are not chemically bonded, and there is no set ratio for how the atoms can combine together.
The atoms can only combine in fixed ratios, and they can only be separated by a chemical change.
The atoms do not retain their individual chemical properties, and they can be separated by physical means.
Explanation:
The atoms are chemically bonded together, and they retain their individual physical and chemical properties.
Answer:
The atoms can only combine in fixed ratios, and they can only be separated by a chemical change.
Explanation:
just took the test the other guys thing was wrong
What makes a substance pure?
Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.
Answer:
Something that contains only one kind of matter. This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties.
if a solid becomes a liquid you must add energy. what is this process called?
Answer:
latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure. The energy required to melt a solid to a liquid is called the heat of fusion, and the heat of sublimation is the energy....................
this is a quiz 6. Relate the sizes of the three subatomic particles to more tangible everyday objects. A= 7. What particles contain most of the mass of an atom? A= 8. What is in between the nucleus and the electrons? A= 9. What is the density of the nucleus? A= 10. How does this density compare with the density of water? A= 11. What is the most basic unit of matter? A= 12. Inside the most basic unit of matter, there are three different particles. What are they and how are they different from each other? A= 13. What are the three particles’ charges? A= 14. Which particles make up the nucleus of the atom? A= 15. The atom is made up of mostly ____________________________________. 16. What is the definition of an element? A= 17. What makes one element different from another element? A= 18. How many protons, neutrons, and electrons are in Carbon, Hydrogen, Oxygen, and Neon. A= 19. What is an isotope? A=
Answer:
677
Explanation:
Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. (a) This is an example of potential energy being converted into what form of energy? (b) Does the potential energy of the two particles prior to release increase or decrease as the distance between them is increased.
Answer:
(a) Kinetic energy.
(b) The potential energy between the two particles will decrease as they move away from each other.
Explanation:
(a)The question seems to imply that the two particles were not moving before they were released. In that case, both particles will have a kinetic energy of zero.
However, once the two particles are released and start to move away from each other, their speed increases. That corresponds to an increase in their kinetic energies. As these particles move away from each other, their kinetic energy continues to increase. Note that electrical repulsion is the force that accelerated the two particles. Therefore, conclude that the (electrical) potential energy of the two particles is converted to kinetic energy.
(b)Let [tex]q_1[/tex] and [tex]q_2[/tex] denote the charge on the two particles. Let [tex]r[/tex] denote the distance between them. Assume that the sizes of these two particles are much smaller than the distance between them. Let [tex]k[/tex] represent the Coulomb Constant. The size of the electrical potential energy between the two particles would be:
[tex]\displaystyle E = \frac{k\, q_1\, q_2}{r}[/tex],
Based on these assumptions, the size of the electrical potential energy between the two particles is inversely proportional to the distance between them. Increasing the distance between the two particles would reduce the size of the electrical potential energy.
3. Which of the following best describes the difference in the results of mitosis and
meiosis?
a. Mitosis results in daughter cells with a
complete set of genes. Meiosis
results in daughter cells with half the
genes.
b. Mitosis results in four daughter cells.
Meiosis results in only two daughter
cells.
c. Mitosis produces results in only a few
seconds. Meiosis produces results in
several hours.
d. Mitosis results in daughter cells with a
cell membrane. Meiosis results in
daughter cells with a cell wall.
4
Seycells have
Answer:
A
Explanation:
Mitosis makes 2 daughter cells so you know the answer is not b
What effect did the new study have on scientists' ideas about the way Earth's water formed? (A) Scientists are convinced that Earth mostly got the hydrogen for its water from other nearby planets that have water. (B) Scientists believe the solar nebula may have provided an extra source of hydrogen that helped water form on Earth. (C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it. (D) Scientists are concerned that they will never learn the true cause behind the formation of water on Earth.
Answer: (C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it.
Explanation:
The scientists are collecting evidence for the fact that the earth's water is the product of the gas left due to the formation of the sun and the asteroidal material. The fact finding inquiry related to this matter has also arose many questions related to the development of the other planets on the solar system and their potential to sustain or support life.
Hence, based on the above information, option C. is correct.
B
(2)
energy
(3)
A
reaction pathway
2C(s) + H2(g) + 227.4 kJ → C2H2(g)
In the energy diagram, which number represents the potential energy of the products?
Answer:
mgh is the formula for potential energy
water is a compound not a mixture , even thought it contains hydrogen and oxygen. how can u prove that this is a correct statement
Answer:
Hence, water is a compound because it can only be separated into hydrogen and oxygen atom by chemical reaction.A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. Thus, water is a compound.
Explanation:
you add 5.6g of iron to 23.60ml if water and observe that the volume of iron and water together is 24.31 ml. calculate the density
Answer:
8g/mL
Explanation:
Density = Mass/Volume
There is 5.6g of Iron added to the water of 23.60mL and it rose by 0.7mL.
Density = 5.6g/0.7mL of Iron.
Convert 0.057 m to km
Answer:
5.7e-5
Explanation:
[tex]\frac{0.057}{1000} \\= 5.7\times 10^-5 km[/tex]
0.057 meters is equivalent to 0.000057 kilometers.
The metric system is a decimal-based system of measurement where prefixes are used to indicate different magnitudes of the base unit. In the case of length or distance, the base unit is the meter (m), and the prefix "kilo-" represents a factor of 1000.
To convert a smaller unit, such as meters, to a larger unit, such as kilometers, we divide by the appropriate conversion factor, divide by 1000 since there are 1000 meters in 1 kilometer.
To convert meters (m) to kilometers (km), divide the value in meters by 1000 since there are 1000 meters in 1 kilometer.
Given that we want to convert 0.057 m to km, calculate it as follows:
0.057 m ÷ 1000 = 0.000057 km
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A rectangle has a length of 5.50m and a width of 12.0m. What is the area of this rectangle?
Answer:
66m
Explanation:
To get the area of something you multiple the length (5.5) by the width (12) together. So the problem would look like 5.5×12 and if you multipe that you get 66
Rutherford's Simulation showed that the positive protons are scattered all over the atom. True False
Answer:
False
Explanation:
I have no explanation. I am guessing
2.3.12mL =
L*
O
a. .312
O b.31.2
O
C..00312
O d..0312
Answer:
0.00312 L
Explanation:
1 liter = 1,000 ml
3.12 ml*(1 liter/1,000ml) = 0.00312 L
C
When a scientist analyzes experimental results, the scientist is
What physical changes occured while you ate breaskfast?
What chemical changes occured while you ate breakfast?
Answer:
Now eating can change food both physically and chemically. Once your spit touches the food chemicals in the saliva begin to change the food chemically.
Explanation:
Answer: It made you not hungry anymore and filled you up. It also helped your brain be more focused.
Explanation:
A physical change is a change that doesn't create a new substance or change the substance. Usually this involves a size or shape change. ... A chemical change is a change that creates a new substance or changes the substance. Usually, this involves color change, temperature change, and/or a new substance being formed.
hope this help luv
What is OXIDATION, BREATHING and RESPIRATION?
Answer:
Oxidation: The combustion of food and releasing energy in the presence of oxygen is called oxidation. Breathing: The process of taking oxygen and throwing carbon dioxide is called breathing. Respiration: The process of burning of food taken by organisms in the body to release energy is called respiration.####
Answer:
These are the answers:.
[tex]OXIDATION-[/tex] is the loss of electrons during a reaction by a molecule, atom or iron.[tex]BREATHING-[/tex] this is involves moving air in and out of the lungs for gas exchange with our environment taking in oxygen and bringing out carbon dioxide.[tex]RESPIRATION-[/tex] movement of oxygen from outside to cells and the transport of carbon dioxide in opposite direction.Explanation:
Respiration has many meanings.
Hope it helps.
Which of the following appliances increase CFC's in the atmosphere?
(2 Points)
A.Refrigerators
B.Microwave ovens
C.Washing machines
D.Televisions
Answer:
Television cause it has a satellite
Each cell has a membrane. This is a thin layer that surrounds it. It keeps the inside and outside of the cell separate. What does the word "surrounds" mean? A fully supports B stands alone C pulls apart D totally covers
Answer:
D
Explanation:
Cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it.
if the density of iron is 8.76g/ml how many liters will 10.0 grams occupy please I need help
Answer:
0.876 ml
8.76/10 = 0.876
a
In 25 words or fewer, what is the scientific question for the boiling
water experiment?
Answer: Does adding salt to water make the water boil faster that if salt is not added?
Explanation:
The scientific question for the boiling water experiment could be: "What is the effect of increasing temperature on the boiling point of water?"
This question aims to investigate how temperature influences the boiling point of water. By conducting the experiment and analyzing the results, scientists can gain a better understanding of the relationship between temperature and the physical state change of water from liquid to vapor.
The question focuses on a specific variable (temperature) and its impact on the boiling process, allowing for a targeted investigation and potential insights into the behavior of water under different conditions.
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Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about
the salt sample that Gerry is looking at?
Answer:
The atoms are vibrating in place.
Explanation:
One of the properties of an ionic substance is the possession of a crystalline structure. As Gerry observed the salt under a microscope, he discovered that it has a crystalline structure. Crystalline salts are all ionic in nature, hence the salt observed by Gerry is an ionic salt.
Solids containing a definite crystalline structure always has their particles vibrating in place. This is immediately evident as Gerry looks at the salt through a microscope.
Answer:
D.The atoms are vibrating in place
Explanation:
PLEASE HELP!!!! I NEED TO TURN IT IN TODAY!!
what volume is represented by each small tick mark?
Answer:
hey mines due today did u ever get the answerrr!!
Explanation:
Answer: 25 ML
Explanation:
I had that question and got it right so..
If your answer is a measurement, it is not correct unless _____. A)it is converted to an SI unit of measurement B)all the units have cancelled out C)you have checked your answer with your teacher D)it includes the proper units along with the numbers E)it is rounded off to the second decimal place
Answer:
A) it is converted to an SI unit of measurement
Explanation:
The SI, System International units are the fundamental units used to measure the scientific quantities.
Example of SI units are Kilogram (km) for distance, liter (l) for liquid, centimeter (cm), and meter (m) for size of the object or short distance etcetera.
SI units help to differentiate quantities from each other and without using SI unit, no one can identify the category of the quantity whether it is distance, size or volume.
Hence, the correct answer is "A) it is converted to an SI unit of measurement".
the atomic number of an atom is the number of ____ in that atom.
Answer:
Protons
Explanation:
Bromine has 35 protons and is number 35 for example