A storm is moving east towards your house at an average speed of 35 km/hr. If the storm is currently 80 kilometers from your house in how much time do you expect it to arrive
Where are the most reactive nonmetal elements found on the periodic table?
at the top of group 17
at the bottom of group 17
at the top of group 18
at the bottom of group 18
Answer: Option (a) is the correct answer.
Explanation:
Elements of group 17 are fluorine, chlorine, bromine, iodine and astatine. And, it is known that size of elements increases on moving down the group due to increase in number of electrons.
Since, atomic number of fluorine is 9 and its electronic distribution is 2, 7. So, it needs just one more electron to stabilize itself and fluorine has the smallest size as compared to rest of the atoms of its group so, it has the ability to attract an electron more strongly towards itself.
Also, due to small size nucleus of fluorine is able to pull electrons strongly towards itself. As a result, there will be increase in its reactivity.
Thus, we can conclude that the most reactive non-metal elements are found on the periodic table at the top of group 17.
A truck travels up a hill with a 7.9 ◦ incline. the truck has a constant speed of 25 m/s. what is the horizontal component of the truck's velocity? answer in units of m/s.
I really need help! Please no one has helped me! Will give BRAINLIEST, THANKS, and RATE!! Please help if you are good at science and HURRY PLEASE!!!
How does the law of conservation of mass apply to this reaction: C2H4 + 3O2 --> 2H2O + 2CO2?
A.Only the oxygen needs to be balanced
B. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen and carbon
C.The law of conservation of mass has already been applied
D. Each element needs to be balanced
It is "c", and i hope it's correct. please pm me, if you need more help
How did scientists determine the age of the ocean floor?
A child leaves her book bag on a slide. the bag, which is at the top of the slide, starts from rest and reaches the bottom in 1.47 s. the mass of the book bag is 2.45 kg, the length of the slide is 2.50 m and the angle of incline is 30.5°. (assume the +x-axis to be parallel to and down the slide. for all values, enter the magnitude only.)
How might an ecologist Measure population density of pine trees in an actual forest?
Cells that remain as sources of other cells are called
Stem cells are the source of other cells, with some referred to as totipotent or multipotent based on their differentiation potential. Transformed cells or cells from tumors can give rise to continuous or immortal cell lines that grow indefinitely in culture.
Explanation:Cells that remain as sources of other cells are known as stem cells. Stem cells have the unique capacity to self-renew and differentiate into various cell types. The ultimate stem cells found in the early embryonic stages are referred to as totipotent, as they can differentiate into any cell type necessary for the development of an organism. As development progresses, stem cells can become multipotent, retaining the ability to develop into multiple, but not all, cell types within a certain lineage, such as red or white blood cells. In specific cultures, certain cells like transformed cells or those from tumors can result in a continuous cell line and exhibit characteristics such as indefinite growth in culture when the medium is replenished; these are termed cell lines or, in some cases, immortal cell lines.
Stem cells are the sources of other cells, with varying degrees of differentiation potential: totipotent, pluripotent, and multipotent. In laboratory conditions, cells can also form a continuous cell line that can proliferate indefinitely, which is often used for research and medical purposes.
Explanation:Cells that remain as sources of other cells are commonly known as stem cells. These cells have the unique ability to differentiate into various cell types or continue to replicate as more stem cells. Notably, there are different potency levels of stem cells; totipotent stem cells can differentiate into any cell type or even an entire organism, pluripotent cells can become any cell type except for totipotent cells, and multipotent cells can differentiate into a limited range of cells within a lineage, such as blood cells. In a laboratory setting or medical applications, certain cells can be manipulated or derived to form a continuous cell line, which can be subcultured many times or even grown indefinitely under the right conditions. However, these cells sometimes exhibit chromosomal abnormalities and are not normal, especially if they originate from transformed cells or tumors. They may undergo transformations becoming 'cell lines' that proliferate indefinitely.
A sound-producing object is moving toward an observer. The sound the observer hears will have a frequency ______ that actually being produced by the object.
lower than
the same as
Higher than
Answer:
Higher than
Explanation:
By Doppler's effect, when there is relative motion between source and observer, the observer does not hear the actual frequency of the sound. The apparent frequency heard by the observer is either more or less than the source depending on whether the observer and source are moving closer or away respectively.
When the sound source moves towards the observer, the later would hear a frequency which is higher than the actual source frequency.
Try this out. Use a calculator!
We can use the formula KE=0.5m*V^2. To find the kinetic energy (KE) of a payload of mass (m) 100 kg as it flies through the air at the velocity (v) of 55 m/s.
(Multiply 0.5 x the mass x velocity squared.)
Your answer will be in Joules (a measure of energy).
Question 3 options:
.
Question 3 options:
5500 J
151250 J
302500 J
2750 J
Answer:
b
Explanation:
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When changing the direction that the ambulance is traveling, the force that causes everything in the ambulance to shift in the direction it was just moving is called?
Write a 150-word paragraph or two that describes at least three everyday things that exist or occur because of science.
A circle has an initial radius of 50ft when the radius begins decreasing at a rate of 2ft/s. what is the rate of change of the area at the instant the radius is 10ft?
The rate of change of the area of a circle with a decreasing radius at the instant the radius is 10ft, is -40π ft²/s.
Explanation:The subject of this question seems to be about the concept of rate of change specifically dealing with the changing area of a circle given a decreasing radius. The circle's area is defined by the equation A = πr². We are told the radius is decreasing at a rate of 2ft/s. To find the rate of change of the area, we can use the formula for the derivative of the circle's area with respect to time, which is dA/dt = 2πr(dr/dt). Plugging in 10 for the radius (r) and -2 for dr/dt (since the radius is decreasing), we get dA/dt = 2π*10*(-2) = -40π ft²/s. So, at the instant the radius is 10ft, the area is decreasing at a rate of 40π ft²/s.
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The rate of change of the area of a circle at the instant the radius is 10ft, while the radius is decreasing at 2ft/s, is -40π ft²/s or putting π = 3.14 we get -125.6 ft²/s.
The question is asking for the rate of change of the area of a circle when the radius is decreasing at a constant rate. Since the area of a circle is defined by the equation A = πr² , where A is the area and r is the radius, we use calculus to find the rate of change of the area with respect to time ([tex]\frac{dA}{dt}[/tex]).
When the radius r is 10ft, the derivative of the area with respect to the radius ([tex]\frac{dA}{dt}[/tex]) is 2πr.
Since the question states that the radius is decreasing at a rate of 2ft/s, we have :
[tex]\frac{dr}{dt}[/tex] = -2ft/s.
Using the chain rule, we can find the rate of change of the area by multiplying these two rates:
[tex]\frac{dA}{dt}[/tex] = [tex]\frac{dA}{dr}[/tex] x [tex]\frac{dr}{dt}[/tex].
So at r = 10ft,
[tex]\frac{dA}{dt}[/tex] = 2π x 10ft x -2ft/s,
or, [tex]\frac{dA}{dt}[/tex] = -40π ft²/s .
putting π = 3.14 we get
[tex]\frac{dA}{dt}[/tex] = -125.6 ft²/s.
This rock, known as balance rock, sits on a thin spike of rock in a canyon in idaho. explain the forces that keep the rock balanced on its tiny pedestal.
Answer:
Action force and Reaction force
Explanation:
The action force which is the balanced rock pushing down due to gravity and the reaction force pushing the equal amount of force. These two things are stated in Newtons third law, where he states that "Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first." Also, he states that "all forces acts in pairs," meaning that every force exerted, there is an opposite force on the first.
The balance rock in Idaho remains balanced due to the forces of gravity and normal force, along with careful positioning of its center of gravity directly over its point of contact with the pedestal.
Explanation:The balance rock, or any other item that seems to defy gravity by precarious balancing, relies on a couple of key forces. The first one is gravity, which pulls the rock downwards, and the second is the normal force, which is exerted by the underlying spike that stops the rock from going any further downwards. Additionally, the center of gravity of the rock is crucial. The center of gravity must be directly over the point of contact for the rock to stay balanced. If the center of gravity was not above this point, the rock would topple over as gravity pulled it downwards.
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As police car with a blaring siren driver away from you while are on standing near intersection, the frequency of the siren is _____therefore, the pitch of the siren is _____.
A) lower, lower B) lower, higher C) higher, louder D) higher, lower E) higher, higher
An object on the surface of the earth has a force of gravity of 682 N. What is the objects mass?
While sleeping, a 15.5 kg dog exerts a downward force on the ground. What is the magnitude of the upward force being exerted on the dog by the ground?
Final answer:
The magnitude of the upward force exerted on the 15.5 kg dog by the ground is equal to the dog's weight, calculated as the product of its mass and the acceleration due to gravity. This force equals 151.9 N.
Explanation:
The question pertains to the concept of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. In the context of this question, while the dog is sleeping and exerting a downward force due to gravity, the ground exerts an upward force of equal magnitude on the dog. This force is often termed the normal force.
To calculate the magnitude of this force, we use the formula for weight (W = m * g), where m is the mass of the dog (15.5 kg) and g is the acceleration due to gravity (approximately 9.8 m/[tex]s^2[/tex]). Thus, the weight of the dog, which is the force it exerts downward, is:
W = 15.5 kg * 9.8 m/[tex]s^2[/tex] = 151.9 N
The normal force will be equal in magnitude to the weight, but acting in the upward direction. Hence, the magnitude of the upward force exerted by the ground on the dog is also 151.9 N.
Final answer:
The magnitude of the upward force being exerted on the dog by the ground is approximately 151.9 N.
Explanation:
In this case, according to Newton's third law of motion, the magnitude of the upward force being exerted on the dog by the ground is equal to the magnitude of the downward force the dog exerts on the ground while sleeping. Therefore, the magnitude of the upward force is 15.5 kg multiplied by the acceleration due to gravity, which is approximately 9.8[tex]m/s^2[/tex] result, the magnitude of the upward force being exerted on the dog by the ground is approximately 151.9 N.
When a comet passes near the sun, part of it takes on the appearance of a large, bright ball from which the tail extends. this part is called _________?
A script writer for the next Star Wars movie has proposed a scene where Kylo Ren’s spaceship lands on Jupiter. Which statement best describes this idea?
A. Worth consideration because it reflects the reality that real life astronauts maybe doing the same with in the next decade.
B. Unrealistic in real life because Jupiter has no surface on which to land and even if it did such a journey would be dangerous due to the harsh atmospheric conditions.
C. Unrealistic because Jupiter is the closest planet to the sun and therefore Kylo wrens spaceship would immediately blowup.
D. Worth consideration because it reflects the reality that Jupiter like earth, presently has all the conditions it needs in order to sustain a vast amount of life.
Correct option is B. The idea of a spaceship landing on Jupiter is unrealistic because Jupiter is a gas giant with no solid surface and has harsh atmospheric conditions that would be dangerous for space travel.
The proposed scene in the Star Wars movie where Kylo Ren's spaceship lands on Jupiter is described best by option B.
This scenario is unrealistic in real life because Jupiter is a gas giant and thus does not have a solid surface on which a spaceship can land. Moreover, even if it hypothetically had a surface, the journey would be extremely dangerous due to the planet's harsh atmospheric conditions, including intense radiation belts, strong magnetic fields, and extreme pressures and temperatures.
Which is the most likely place a metamorphic rock might form? on the slopes of an active volcano on the ocean floor eight kilometers below earth's surface two hundred kilometers below earth's surface?
An unusually high tide is called a _______ tide.
Answer:
This correct nswer to this would be spring tide.
Explanation:
An unusually high tide is called a _______ tide. your welcome please make the brainliest!!:)
Chemical reactions with metals may create some interesting results such as precipitate. What is precipitate?
A- a solid that forms when two liquids are mixed
B- a solid that forms when two gases are mixed
C- a gas that forms when two liquids are mixed
D- a liquid that forms when two solids are mixed
Answer:
TITE
Explanation:
When is an object moving in uniform circular motion?
A. when it speeds up around a curve
B. when its tangential speed is constant
C. when it has no net force acting on it
D. when its acceleration is tangent to a circle
Answer:
B:when its tangential speed is constant
Although the speed of an object that has a uniform circular motion is constant, its velocity is not constant. Not only that, but it is actually changing constantly.
A truck pulls a large box to the left with two large chains. The truck is unable to move the box because the large box is in equilibrium. One of the chains has tension in the amount of 1000 Newtons. If the force of friction between the box and the ground is 2500 Newtons, explain and solve for what the tension is in the other chain. Use any relevant rules, laws, and show your work using any math reasoning.
The first scientist to be credited for postulating that earth circled the sun was
If you pull a wool sweater over your head, you will often end up with a wild hairdo. Your hair is hard to comb and wants to stand up. Why?
When heating water on a stove, a full pan of water takes longer to reach the boiling point than a pan that is half full. why?
A full pan of water takes longer to boil than a half-full pan due to water's high specific heat capacity, which requires more energy to raise its temperature, and the energy used to break hydrogen bonds during the boiling phase transition.
When heating water on a stove, a full pan of water takes longer to reach the boiling point than a pan that is half full because of the high specific heat capacity of water. This means it requires a significant amount of energy to raise the temperature of water by a given amount.
A full pan of water takes longer to reach the boiling point than a half-full pan because there is more water in the full pan to absorb the heat from the burner, which causes the temperature of the water to rise more slowly. However, because there is more water in the full pan, it will take longer for the water to evaporate and reach the boiling point.
The metal pot, typically made of aluminum or another material, has a much lower specific heat capacity, so it heats up more quickly in comparison. As the water heats up and reaches the boiling point, the temperature remains constant at 100°C, despite continued heating. This is the boiling point where water undergoes a phase transition from liquid to gas, and the energy supplied goes into breaking the strong hydrogen bonds in water instead of raising its temperature further.
The example illustrates why water takes a long time to heat up, and why even when a pot is hot to the touch, the water itself may still require more time to reach the same temperature level. In essence, the water must absorb more heat to disrupt the intermolecular forces, primarily hydrogen bonding, before its particles can move faster and transition into the gas phase during boiling.
If two teams playing tug-of-war pull on a rope with equal but opposite forces, what is the net external force on the rope?
Has luster
Malleable
Ductile
Conductor
Solid at room temperature
Which element could be described by the list of properties above?
A)
magnesium
B)
mercury
C)
neon
D)
phosphorus
Answer: A) magnesium
Explanation:
Magnesium is a metal which has luster. It is malleable and ductile as most of the metal. It is a good conductor of heat and electricity. It is solid at room temperature.
Rest of others do not have the listed properties .
As mercury is not malleable and ductile as it is a liquid metal.
Neon is noble gas. Phosphorus is a non-metal, cannot beaten up to make sheets.
When comparing equal volumes of a stronger and weaker acid, what would be observed?
A) the strong acid would taste sour; the weaker acid would taste sweeter.
B) the electrical conductivities would be different
C) the effects on blue litmus paper would be different.
D) they would produce the same amount of hydrogen gas in the same amount of time when reacting with zinc
B) The electrical conductivities would be different.
The conductivities would be different because strong acids produce more electrolytes than weak acids.
When comparing equal volumes of a stronger and weaker acid, the electrical conductivities of the two acids would be different as the strong acid will dissociate completely while weak acid will dissociate partially.
What is an acid?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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