Which is a true statement?
A.
Valence electrons play a key role in chemical reactions.
B.
The properties of elements in a group are identical.
C.
Hydrogen contains multiple valence electrons.
Answer:
C
Explanation:
What is the resistance of a 6.0 m long gold wire (ρgold = 5.6 x 10 -8 Ω-m) whose cross-sectional area is 5x10 -7m 2 ? (Please show some work)
Answer:
R =0.672 ohms
Explanation:
We have,
Length of a gold wire is 6 m
Resistivity of gold is [tex]5.6\times 10^{-8}\ \Omega-m[/tex]
Area of cross section of the wire is [tex]5\times 10^{-7}\ m^2[/tex]
The resistance of a wire is given by the relation as follows :
[tex]R=\rho\dfrac{l}{A}\\\\R=5.6\times 10^{-8}\times \dfrac{6}{5\times 10^{-7}}\\\\R=0.672\ \Omega[/tex]
So, the resistance of the gold wire is 0.672 ohms.
Please help! I'll mark you as branliest!!! :)
Answer:
pretty sure its C, Radiation because the sun produces radiation
Explanation:
Answer: conduction
Explanation:
The sand is directly transferring heat to the people. They are touching, so it would be an example of conduction.
In terms of forces, what makes the arrow start moving?
Answer:
the answer is A force is a push or pull that changes the motion of an object. Forces can make objects start or stop moving, cause objects that are already moving to speed up or slow down, or make objects change direction. Force arrows are used to represent both the magnitude and direction of forces.
Explanation:
hope this helps u stay safe
Which angle is the angle of refraction?
1
2
3
The angle of refraction is 3
The correct option is 3.
What is the angle of incidence and refraction?The angle formed at the point of incidence between the incident ray and the normal is called the angle of incidence. The angle formed between the refracted ray and the normal is called the angle of refraction. The angle of Incidence and Angle of Refraction.
What is N in Snell's law?As in reflection, we measure the angles from the normal to the surface, at the point of contact. The constants n are the indices of refraction for the corresponding media.
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Which of the following are major problems with fission reactors? maintaining high temperatures disposal of hot water disposing of radioactive waste obtaining fuel
Answer:
hot water
Explanation:
Answer:
a
Explanation:
9) Who was right about the atom, Bohr or Schrodinger?
Answer: Schrodinger
Explanation: because Schrodinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
Schrodinger because Bohr's model was not completely correct, but it has many features that are approximately correct and it is sufficient for much of our discussion.
10. Which of the following types of drug use is not found in Erich
Goode's list of drug use types?
A) Legal instrumental
B) Legal recreational
C) Legal nonrecreational
D) Illegal recreational
Legal nonrecreational types of drug use is not found in Erich Goode's list of drug use types. Hence, option (c) is correct.
What is Erich Goode's list of drug use types?American sociologist Erich Goode is an expert in the sociology of deviance. He has authored a lot of books on the subject generally as well as on particular aberrant subjects. At the State University of New York at Stony Brook, he was a professor.
Goode's four drug use patterns
Legal instrumental use: Using over-the-counter and prescription medications to treat or relieve symptoms.Legal recreational use: Using legal substances (such as coffee, alcohol, or tobacco) to induce a particular frame of mindIllegal instrumental use - Using non-prescription medications to carry out an action or achieve a target.Illegal recreational use: Using illicit substances to get high or have fun.Learn more about drug, refer the link:
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A wave that is traveling toward an interface is called the...??
Answer:
Surface wave
Eg ocean wave
What do glands do for the body?
Answer: A gland is an organ which produces and releases substances that perform a specific function in the body.
Explanation: A gland is an organ which produces and releases substances that perform a specific function in the body. There are two types of gland. Endocrine glands are ductless glands and release the substances that they make (hormones) directly into the bloodstream.
Answer:
A gland is an organ which produces and releases substances that perform a specific function in the body. There are two types of gland. Endocrine glands are ductless glands and release the substances that they make (hormones) directlyinto the bloodstream.
Explanation:
What does the term “retroperitoneal” mean in the terms of the location of the kidneys ?
Answer:
"Retroperitoneal" refers to the back of the peritoneum, the membrane that lines the anatomical space in the abdominal cavity. Kidney stones may cause pain to the organs within the retroperitoneal space. A diagram of the aorta, a retroperitoneal structure.
Explanation:
if 34.7 g of O2 reacts with iron to form 79.34 g of iron oxide, how much iron was used in the reaction?
A.
19.84 g
B.
44.64 g
C.
104.1 g
D.
114.04 g
Answer: B. 44.64 g
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Mass of reactants = mass of iron + mass of oxygen = mass of iron + 34.7 g
Mass of product = mass of iron oxide = 79.34 g
As Mass of reactants = Mass of product
mass of iron + 34.7 g = 79.34 g
mass of iron = 44.64 g
Thus 44.64 g of iron was used in the reaction
In a 200 meter sprint there is one curve and one straightaway? true or false
Answer:
I got true
Explanation:
Not the best explanation, but my dad said it was true.
What can happen if the excretory system doesn't work properly ?
As SCUBA divers go deeper underwater, the pressure from the weight of all the water above them increases tremendously which compresses the gases in their blood. What happens to the volume of gas in their blood as the diver rises quickly to the surface?
A.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to decrease.
B.
As a diver rises, the pressure on their body increases which allows the volume of the gas to decrease.
C.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to increase.
D.
As a diver rises, the pressure on their body increases which allows the volume of the gas to increase.
Answer: A.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to decrease.
Explanation:
The problem is that a diver, experiences an increased pressure of water compresses nitrogen and more of it dissolves into the body. Just as there is a natural nitrogen saturation point at the surface, there are saturation points under water. Those depend on the depth, the type of body tissue involved, and also how long a diver is exposed to the extra pressure. The deeper a diver go, the more nitrogen the body absorbs.
The problem is getting rid of the nitrogen once you ascend again. As the pressure diminishes, nitrogen starts dissolving out of the tissues of the diver's body, a process called "off-gassing." That results in tiny nitrogen bubbles that then get carried to the lungs and breathed out. However, if there is too much nitrogen and/or it is released too quickly, small bubbles can combine to form larger bubbles, and those can do damage to the body, anything from minor discomforts all the way to major problems and even death.
Two identical speakers are 3.50 m and 5.20 m from a listener. What is the lowest frequency (n = 1) that would cause constructive interference there? PLS HELP!
For constructive interference the path difference must be an integer number of wavelengths. The lowest frequency for this would be the longest wavelength with the path difference equal to one wavelength.
Path length difference(m) = 5.20 - 3.50 = 1.70m.
λ =2m ⇒ f = v/λ
λ/2 =1.70
λ = 3.40m
Taking speed of sound as v = 340m/s:
f = v/λ = 340/3.40 = 100Hz.
What is constructive interference?"When two waves of identical wavelength are in phase, they form a new wave with an amplitude equal to the sum of their individual amplitudes."
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Answer:114
Explanation:
for Acellus
During which two phases would surfer’s most likely benefit
A. New and Full Moon
B. New moon and Waxing Crescent
C. Full Moon and Waxing Gibbous
D. 1st Quarter and 3rd Quarter
The phases where surfer’s most likely benefit include D. 1st Quarter and 3rd Quarter.
Surfers will benefit include during the 1st Quarter and 3rd Quarter because there's tidal change. Tidal change is when coastal areas experience two low and high tides.
The benefit of surfing during this period is that it helps jack the waves. Waves transmit energy and this is important to surfers.
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A Physics question regarding circuits and electricity.
Find the acceleration of a car with the mass of 1,200 kg and a force of
11 x 103 N.
a
9.2 m/s2
b 5 m/s2
c 2 m/s
d 10 m/s2
Answer:9.17 m/s^2
Explanation:
mass=1200kg
Force=11 x 10^3 N
Acceleration=force ➗ mass
Acceleration=11 x 10^3 ➗ 1200
Acceleration=9.17
Acceleration=9.17 m/s^2
You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal mass (1,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know: Car 1 approached the intersection from the top of a 25-meter hill. Car 2 was on a flat stretch of road directly in front of Car 1. At the bottom of the hill, Car 1 was going 20 m/s; Car 2 was going 30 m/s before it stopped at the stop sign. There were no skid marks left by Car 2. The collision occurred at the stop sign, where Car 2 had stopped. After the collision, both cars were moving together in the same direction at 10 m/s before slowly rolling to a stop. You must now push Car 2, using 800 N of force, 10 meters off to the side of the road so no one else gets hurt.
1. What was the potential energy of Car 1 at the top of the hill? (3 points)
2. What was the kinetic energy of each car before braking? (4 points)
3. A. How much energy did Car 1 lose from the top to the bottom of the hill? (3 points)
B. Where do you suppose that energy went? (2 points)
4. How much work was done to bring Car 2 to a stop? (4 points)
5. If Car 2 came to a stop in 15 seconds, how much power (in watts) did it take to stop Car 2 at the stop sign by applying force to the brakes? (3 points)
6. What is the final combined momentum of the cars right after the accident? (6 points)
7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points)
A. Car 1 (3 points)
B. Car 2 (3 points)
8. How much energy did Car 1 lose in the collision? (3 points)
9. How much energy did Car 2 gain in the collision? (3 points)
10. Which of the two laws covered in this unit - Law of Conservation of Momentum or Law of Conservation of Energy - is obeyed in this problem? Explain your reasoning. (5 points)
11. How much work did it take to move Car 2 off to the side of the road? (3 points)
12. If it took you 40 seconds to move Car 2 off the road, how much power did you expend? (3 points)
13. Which simple machine does a car have that helped you move Car 2? Explain. (2 points)
What do snow melting, water freezing to ice, and water boiling into steam have in
common? *
O
They involve a change in state.
They involve a change in temperature.
O
They involve a change in thermal energy.
All of the above are true.
Answer:
All of the above.
Explanation:
In a science experiment showing the splitting of water into Oxygen and hydrogen, two inverted test tubes of water were placed over the site of the reaction. (see the pic) How can you tell which one was catching the oxygen and which one was catching the hydrogen? Question 4 options: The hydrogen is a positive ion and will be located close to the negative terminal of the battery. The oxygen is a negative ion which will be located next to the negative terminal of the battery. There are 2 hydrogen atoms for every oxygen atom. The hydrogen will take up more space and is pushing the water lower in the test tube. The hydrogen, being a smaller atom, will take up less space than the oxygen. It will push the water down less.
Answer:
There are 2 hydrogen atoms for every oxygen atom. The hydrogen will take up more space and is pushing the water lower in the test tube.
Explanation:
To find out what water is made of, we may have to look at its chemical formula, which is H2O. This basically tells us that the water molecule is composed of two elements: hydrogen and oxygen or, more precisely, two hydrogen atoms (H2) and one oxygen atom (O). Hydrogen and oxygen are gases at room temperature. Splitting water into its two components is much easier to do by a process called water electrolysis. Making hydrogen or oxygen this way seems simple. In water electrolysis, the source of energy used is electricity. An easy way to generate electricity is with a battery. Because pure water is not good at conducting electricity, however, electrolysis requires the addition of an electrolyte, such as salt or acid. The electrolyte dissolves in water and separates into ions (electrically charged particles) that move through the solutions and are able to conduct electricity this way.
As electrolysis progresses, the water level at the negative terminal becomes about half that of the positive terminal, meaning that we have collected double the amount of hydrogen gas compared with oxygen. The difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen atom, as explained above. This means it takes two water molecules (2 H2O) to make one oxygen molecule (O2). At the same time, however, two molecules of water (2 H2O) can make two molecules of hydrogen (2 H2). Hence the answer.
HEELLLPPPPP !
Match the property with the correct type of metal.
Soft
(Alkali Metals)
(Alkaline Earth Metals)
Extremely reactive
1 valence electron
2 valence electrons
Harder, more dense
Answer: Alkali metals
Soft, Extremely reactive, 1 valence electron
Alkaline earth metals
Harder, more dense, 2 valence electrons
Answer:Alkali metals
Soft, Extremely reactive, 1 valence electron
Alkaline earth metals
Harder, more dense, 2 valence electrons
Explanation:
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Which of the following is a homogenous mixture?
Answer:
Blood
Explanation:
Homogenous means the same type and a box with toys, spaghetti and meatballs, and trail mix all have variety.
Answer:
B is the correct answer
what are the 2 processes involved in parents passing on their genes?
Answer:Chromosomes are passed from parents to offspring via sperm and eggs. The specific kind of chromosome that contains a gene determines how that gene is inherited.
Explanation:
Please have a look at the image
Answer:
a
Explanation:
a. zero is the answer...
Which one of the following statements about electric current is correct
Answer:
hey friend, you haven't mentioned the statements...
URGENT!! Please answer
Pillows ___ light
- absorb
- reflect
- refract
- All of the above
Answer:
All of the above or absorb
Explanation:
I'm pretty sure it is absorb, because it depends what type of pillow for it to reflect.
Answer:
pillows absorb light.
Explanation:reflection would have been more like a glass mirror because the mirror reflects light.
At t = 0, a car has a speed of 30.0 m/s. At t=6.00 s, its velocity is 12.0 m/s.
What is its average acceleration during this interval? plz help...
Answer: [tex]-3m/s[/tex]
Explanation:
[tex]a=\frac{V_2-V_1}{t}[/tex]
[tex]a=\frac{12-30m}{6s}\\a=-\frac{18m}{6s}\\ a=-3m/s[/tex]
We have a negative acceleration, meaning that the car is slowing down.
Using the diagram below, calculate the PE and KE of the ball at the top, middle, and bottom of a drop. SHOW YOUR WORK!!
Write an explanation of what would happen to the ME, PE, and KE of the ball from the top of the drop to the middle of the drop, and then at the bottom.
Answer:
At the top
K.E = 0
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Explanation:
Given that
M= 5kg
H = 20 m
t = 7 s
According to conservation of energy,
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Given that
M= 5kg
H = 20 m
t = 7 s
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Explanation:
Given that
M= 5kg
H = 20 m
t = 7 s
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
