Answer:
Sea-floor spreading occurs in the oceanic ridges. In there, volcanic activity, together with the gradual movement of the bottom, form new oceanic crust. This allows a better understanding of the continental drift explained by the theory of plate tectonics.
The greatest evidence for Sea-floor spreading is the oceanic trenches, the oceanic ridges, the magma protruding to the surface and the new seafloor.
In previous theories, continents were assumed to be transported across the sea. Harry Hess, in the 1960s, proposed the idea that the seabed itself moves as it expands from a central point. The theory is now accepted, and the phenomenon is thought to be caused by convection currents in the upper layer of the mantle.
Answer:
magnetic reversal
Which statements describe the magnitude of an earthquake? Check all that apply.
It is detected by a seismograph.
It is measured by the Mercalli scale.
It is based on the size of seismic waves.
It is affected by the amount of fault movement.
It is used to determine damage caused by earthquakes.
the correct answers are :
1: It is detected by a seismograph.
3: It is based on the size of seismic waves.
4: It is affected by the amount of fault movement.
Answer:
The correct choices are
It is detected by a seismograph.
It is based on the size of seismic waves.
It is affected by the amount of fault movement.
Explanation:
seismograph is an instrument which is used to determine the earthquakes and records them.
The size of seismic waves is a measure of how strong the earthquake is.
Based on the graph, which statement BEST describes the acceleration of the two objects?
A) Acceleration 1 - no acceleration. Acceleration 2 - negative acceleration.
B) Acceleration 1 - no acceleration. Acceleration 2 - speeds up and slows down.
C) Acceleration 1 - constant acceleration. Acceleration 2 - varied acceleration.
D) Acceleration 1 - positive acceleration. Acceleration 2 - negative acceleration.
Answer:
C) Acceleration 1 - constant acceleration. Acceleration 2 - varied acceleration.
Explanation:
In a velocity-time graph, the acceleration corresponds to the slope of the curve.
In fact, acceleration is defined as the ratio between the change in velocity and the time interval:
[tex]a=\frac{\Delta v}{\Delta t}[/tex]
However, we see that in a velocity-time graph, [tex]\Delta v[/tex] corresponds to the increment in the y-variable ([tex]\Delta y[/tex]), while [tex]\Delta t[/tex] corresponds to the increment in the x-variable ([tex]\Delta x[/tex]). Therefore, acceleration can also be written as
[tex]a=\frac{\Delta y}{\Delta x}[/tex]
which is exactly the definition of slope of the curve.
Now we notice that:
- For object 1, the slope is constant: this means that the acceleration is constant
- For object 2, the slope varies: this means that the acceleration varies as well
Answer:C) Acceleration 1 - constant acceleration. Acceleration 2 - varied acceleration.
Explanation:
The lines on the graph are best described by the following: Acceleration 1 - constant acceleration. Acceleration 2 - varied acceleration. Acceleration 1 DOES show positive acceleration, but since the slope of the line does not vary, the acceleration is constant. Acceleration B has a varied slope, and therefore, a varied acceleration. It does happen to be positive and negative. For zero acceleration, the slope slope would be zero and the line horizontal.
According to the law of reflection, the _____ is equal to the angle of incidence.
A. angle of refraction
B. reflected ray
C. angle of reflection
The angle of reflection is equal to the angle of incidence.
The answer is C.
Answer:
C. angle of reflection
Explanation:
As we know that as per law of reflection of light angle of incidence with respect to the normal must be equal to the angle of reflection with normal in other direction.
So we can say that
angle of incidence = angle of reflection
so here we can say that the correct answer would be
C. angle of reflection
so the light ray will reflect at the same angle as that of angle of incidence given in it
so it must be
[tex]\theta_i = \theta_r[/tex]
Paleobotany is the study of: plant fossils fossilized bacteria human remains fossils in general
Answer:
Paleobotany is the study of plant fossils
Explanation:
Answer:
The correct answer is plant fossils.
Explanation:
Paleobotany is a science shared by botany and paleontology, which studies the remains of plants that lived in the past. It also includes the use of the remains for the reconstruction of ancient environments and the history of life. It includes the study of fossils of terrestrial plants and marine algae.
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How does black body radiation explain particle nature of light?
Any object with a temperature above absolute zero emits light at all wavelengths. If the object is perfectly black (so it doesn't reflect any light), then the light that comes from it is called blackbody radiation.
The energy of blackbody radiation is not shared evenly by all wavelengths of light. The spectrum of blackbody radiation (below) shows that some wavelengths get more energy than others. Three spectra are shown, for three different temperatures. (One of the curves is for the surface temperature of the Sun, 5770 K.)
A 29 N force is pushing an object to the right and a 29 N force is pushing on it to the left. Which direction will it move
The object will not move, since both forces have the same magnitude although not the same direction.
This is due to Newton’s first law of motion, that estates:
If a body is in equilibrium the sum of all the forces acting on it is equal to zero:
[tex]F_{total}=29N-29N=0[/tex]
According to this law, an object in rest can be in equilibrium (net force equals to zero), and a moving object can also be in equilibrium, as long as it keeps a constant velocity.
Place the waves on the EM spectrum from longest to shortest wavelength:
ultraviolet, infrared, gamma, radio, microwave, x – ray, visible
where does these choices go?
1. Can be transformed into the other form
2. A ball is thrown up into the air and rises until it begins to fall.
3. Ball on the edge of a cliff.
4. Increases with mass
5. Gravitational, elastic, chemical
Answer:
Nothing goes to Kinetic Energy
Both-1, 2, 4
Potential Energy-3 and 5
Explanation:
Identify a wave that speeds up when it passes from air to water as well as one that slows down
Answer:
A sound wave speeds up as it passes from air to water. A light wave slows down as it passes from air to water.
Explanation:
Sound waves are the type of mechanical waves, which are formed due to the vibrations of the particles of the medium. The sound waves are longitudinal in which particle moves opposite to the energy transport.
The characteristic of sound waves include:
The wavelength, period, frequency, and amplitude are the characteristics of the sound waves.
The sound waves will travel faster in the water as compared to air because the molecules in the water are tightly packed which resulted in the transmission of sound waves faster.
Thus, the sound waves will travel in the water faster than the air because water is denser, and sound waves travel faster.
To know more about sound waves, refer to the following link:
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Why do you suppose the modern horse has a longer foot than its ancestors?
A) allowed it to swim faster
B) allowed it to reach higher trees
C) allowed for greater chance of mating
D) allowed greater speed to outrun predators
I think the answer is D.
Answer:
A or D
Explanation:
If the answer is A it would allow the horse to get through the water faster. If it is D they would have a faster chance of escaping unharmed by the predator that is after them
when there is unequal sharing between the two atoms of electrons in a bond, the bond is ________.
ionic
polar covalent
nonpolar covalent
electronegative
polar covalent, it is what happens when there is unequal bond between two atoms, where one has a slightly negative charge and one has a slightly positive charge.
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it takes a school bus full of kids longer to stop than it does a small car with a single passenger. which law is this an example o?
Final answer:
A school bus takes longer to stop than a small car because of Newton's Second Law of Motion; it has greater mass and momentum, needing more force and time for deceleration.
Explanation:
The question you've asked relates to why a school bus full of kids takes longer to stop than a small car with a single passenger. This is an example of Newton's Second Law of Motion, which states that force equals mass times acceleration (F=ma). In this case, the school bus has a much larger mass compared to the small car. When brakes are applied, both the school bus and the car exert a force to stop, but because of the larger mass, the force applied by the brakes must be greater for the bus to achieve the same acceleration (or deceleration in this case) as the car. Additionally, the momentum of the bus, which is the product of mass and velocity, is greater, so it requires more time to bring the bus to a stop compared to the car with less momentum.
As temperature of this substance rises from 20°C to 50°C, the substance _______ heat and its kinetic energy _________ .
Answer:
absorbs heat and its kinetic energy increases.
Explanation:
As we know that heat is defined as the change in the temperature as there is increase in the temperature change then the heat will increase or decrease with respect to increase or decrease in temperature change.
In the given, question temperature is changing from 20° to 50° which means there is increase in the temperature which results in the absorption of heat. And increase temperature will increase the average speed of the molecules which results in increase in kinetic energy.
A machine is classified as a compound machine if it
A. has moving parts
B. has an IMA greater than 1
C. is made up of two or more simple machines that operate together
D. is very efficient
the answer is very clearly C.
a common example is scissors
Answer:
The correct option is: A machine is classified as a compound machine if it C. is made up of two or more simple machines that operate together.
Explanation:
Composite machines are mechanical devices that have been formed from two or more simpler machines which are connected in series. In this way, when one of these parts of the composite machine is activated, the rest work in a coordinated manner, being able to offer together a function that individually could not.
Composite machines have operators that work in coordination. These operators can be:
Mechanical operators : They are the elements that allow the operation of the machine turning the force into movement. This set is what is called a mechanism. Energy operators: are responsible for storing energy or force and transform it into another type so that the device can be activated and perform its function.In short, the correct option is: A machine is classified as a compound machine if it C. is made up of two or more simple machines that operate together.
a toaster has a heating element of 15 ohms and is connected to 120 volt outlet. show that the current drawn by the toaster is 8 amps.
Answer:
Explanation:
Ohm's law:
V = IR
Given V = 120 V and R = 15 Ω:
120 V = I (15 Ω)
I = 8 A
does the force affect the accelerationof the car?
Force = mass*acceleration
Force and acceleration are dependent on one another, and therefore, the force does affect the acceleration of the car.
Answer:Any force can affect the acceleration of a car so yes.
Explanation:
Which property of a circuit is equal at every point on a parallel circuit?
Answer:
Voltage
Explanation:
In a parallel circuit, electric current has more than one path to flow and the loads are parallel to each other.When one of the loads( bulb) is malfunctioning, current still flows in the other path to serve the remaining loads.The voltage is the same in every part of a parallel circuit.This is because the difference in potential at the start of the circuit equals that at the end of the circuit.
What is the term for visual representation of data
A.extrapolation
B.graph
C.interpolation
D.Correlation
I think it is graph (b). You can visually see the data on a graph.
Under normal conditions of temperature and pressure, the gaseous state of a liquid is called _______.
A. vapor
B. water
C. smoke
D. ice
The gaseous state of a liquid is called as vapor under normal conditions of temperature and pressure.
Answer: Option A
Explanation:
Vapor is a form of substance floating in air where increasing or decreasing the temperature and pressure changes the state of the substance into gas or liquid.
For example : consider water where heating it to the boiling point makes it as water vapor and reducing its temperature makes it as ice.
Under normal conditions of temperature and pressure, the gaseous state of a liquid is called vapor. The correct answer is A.
When a liquid is heated or its pressure is reduced, the kinetic energy of its molecules increases, causing them to gain enough energy to overcome intermolecular forces and transition into the gaseous state. This gaseous form of a substance, while retaining the same chemical composition as the liquid, is called vapor.
Let's examine why the other options are not true:
B. Water: Water specifically refers to the liquid state of H2O molecules. While water can exist as a liquid, solid (ice), or gas (water vapor), under normal conditions, the gaseous state of a liquid is referred to as vapor rather than water.
C. Smoke: Smoke is not the gaseous state of a liquid. It typically consists of tiny solid particles or liquid droplets suspended in the air, resulting from the incomplete combustion of organic matter. Smoke is not directly related to the gaseous state of a liquid substance.
D. Ice: Ice refers to the solid state of water. It is the result of the cooling and freezing of liquid water molecules. Ice is not related to the gaseous state of a liquid substance.
Therefore, under normal conditions of temperature and pressure, the gaseous state of a liquid is called vapor. While water refers to the liquid state, smoke is not directly related, and ice represents the solid state of a liquid substance.
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Help for 25 points.
2. Check all that apply. Electromagnetic waves are:
Mechanical waves
Transverse waves
Pressure waves
Move perpendicular
Move parallel
Frequency is directly related to speed
Frequency is inversely related to wavelength
Wavelength is directly related to speed
Require a medium
Transfer energy
Answer:
Transverse waves
Move perpendicular
Frequency is directly related to speed
Frequency is inversely related to wavelength
Wavelength is directly related to speed
Transfer energy
Explanation:
Electromagnetic waves consist of periodic oscillations of electric and magnetic fields. As all waves, they transfer energy, but not matter,
Electromagnetic waves are transverse waves, which means that they oscillate in a plane perpendicular to the direction of propagation of the wave. The speed, the wavelength and the frequency of electromagnetic waves are related by the following equation:
[tex]c=f\lambda[/tex]
where
c is the speed (speed of light, which is constant for electromagnetic waves travelling in a vacuum)
f is the frequency
[tex]\lambda[/tex] is the wavelength
From this equation we see that:
- The frequency is directly related to the speed
- The wavelength is directly related to the speed
- The frequency is inversely related to the speed
The more power applied to an object, the faster work is done to it.
True
False
Answer:
True
Explanation:
The power of applied to an object is calculated by dividing the work done by time in seconds.That is;Power = work done/time
From this relationship, power is directly proportional to work done and inversely proportional to time, thus an increase in power means work will be done faster as time taken will be less.___ + 3H2O + light —> C3H6O3 + 3O2. What amount and substance balance this reaction?
Answer:3H2O + light-c3h603+302
Explanation:
Answer: A) 3CO2
Explanation:
A 2-kg bowling ball rolls at a speed of 10m/s on the ground whats its ke
Answer:
Explanation:
I wonder what level of physics you are taking? If this is a beginning course (which I'm going to assume) then the KE is
KE = 1/2 m v^2
KE = 1/2 * 2kg * (10 m/s)^2
KE = 100 Joules.
If you are in an upper level course and need to take into account the rotational motion, leave a note.
Why does the reactivity of elements increase moving from left to right on the periodic table?
A) Atoms of elements more easily let go of their valence electrons
B) atoms of elements are closer to filling their valence shell with electrons
C) the valence shells of each
elements atoms get smaller
Pick one
Answer:
C.) the valence shells of each elements atoms get smaller
Explanation:
I did the test and got it right
Answer:
Atoms of elements are closer to filling their valence shell with electrons.
Explanation: i did the test and got it correct
a container of water is knocked off a 10.0 meter high ledge with a horizontal velocity of 1.00 meters/second. calculate the time it takes for the container to reach the ground
Answer:
1.43 s
Explanation:
The time it takes for the container to reach the ground is determined only by the vertical motion of the container, which is a free-fall motion, so a uniformly accelerated motion with a constant acceleration of g=9.8 m/s^2 towards the ground.
The vertical distance covered by an object in free fall is given by
[tex]S=ut + \frac{1}{2}at^2[/tex]
where
u = 0 is the initial vertical speed
t is the time
a= g = 9.8 m/s^2 is the acceleration
since u=0, it can be rewritten as
[tex]S=\frac{1}{2}gt^2[/tex]
And substituting S=10.0 m, we can solve for t, to find the duration of the fall:
[tex]t=\sqrt{\frac{2S}{g}}=\sqrt{\frac{2(10.0 m)}{9.8 m/s^2}}=1.43 s[/tex]
NEED DONE ASAP ILL GIVE 25 points AND BRAINLIEST HURRY UP BEFORE 330
Question 1(Multiple Choice Worth 3 points)
The table below lists types of credit.
Types of Credit
Service credit
?
Installment credit
Credit card
Which term best completes the table?
Loan
Interest
Check
Debit
Question 2(Multiple Choice Worth 3 points)
What is credit?
Money paid to a bank or other financial institution to open an account
Money paid to the U.S. Treasury or Federal Reserve Bank to support the government
An arrangement where a buyer obtains a good or service and pays for it all at once
An arrangement where a buyer obtains a good or service but pays for it later or over time
Question 3(Multiple Choice Worth 3 points)
Which of the following makes a true statement about the relationship between government and financial institutions?
Government and financial institutions do not interact with each other.
Financial institutions like the U.S. Treasury must approve increases in the government deficit.
Government can pass laws to limit what financial institutions can charge in interest and fees.
Financial institutions like local banks must approve interest rates set by the Federal Reserve.
Question 4(Multiple Choice Worth 3 points)
Jessica thinks that everyone would be better off if financial institutions stopped issuing credit. Which statement accurately supports her argument?
People would pay less in interest fees.
People would have greater protection in case of emergencies.
People would need to save for many years to buy a home or open a business.
People would support the economy through purchases of more goods and services.
Question 5(Multiple Choice Worth 3 points)
What is a benefit of a person borrowing money to start a business?
The business can help grow the economy and create jobs.
The business is more likely to earn greater profits faster.
The loan is less expensive than using cash.
The loan is likely to be paid off quickly.
Question 6(Multiple Choice Worth 3 points)
How can the U.S. government control financial institutions?
Voting on a new budget
Loaning money to state governments
Borrowing money from a foreign bank
Passing laws for credit card companies to follow
Question 7(Multiple Choice Worth 3 points)
What is one role of the U.S. Treasury?
Approve the federal budget
Approve federal deficits
Issue securities
Issue personal loans
Question 8(Multiple Choice Worth 3 points)
What is one role of the Federal Reserve?
Issue business loans directly to American companies to encourage economic growth
Control the market for securities to help encourage or slow economic growth
Provide banking services for federal employees
Approve increases to the federal deficit
The term best completing the types of credits is 'Loan'. Credit is when a buyer obtains something but pays later or over time. The government can control financial institutions by passing laws for them to follow.
Explanation:AnswerOption a. The term that best completes the table under type of credits is 'Loan'.Option d. Credit is described as an arrangement where a buyer obtains a good or service but pays for it later or over time.Option c. The relationship between government and financial institutions can be correctly stated as: Government can pass laws to limit what financial institutions can charge in interest and fees.Option a. The statement that supports Jessica's argument that everyone would be better off if financial institutions stopped issuing credit is, 'People would pay less in interest fees'.Option a. A benefit of a person borrowing money to start a business is, 'The business can help grow the economy and create jobs'.Option d. The U.S. government can control financial institutions by, 'Passing laws for credit card companies to follow'.Option c. One role of the U.S. Treasury is to, 'Issue securities.'Option b. A role of the Federal Reserve is to, 'Control the market for securities to help encourage or slow economic growth'.Learn more about Financial Institutions and Credit here:https://brainly.com/question/31710522
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A Ray of light in air is incident on an air to glass boundary at an angle of 30. degrees with the normal. If the index of refraction of the glass is 1.52, what is the angle of the refracted ray within the glass with respect to the normal? A. 19 degrees B. 22 degrees C. 30 degrees D. 1.52
Answer:
A
Explanation:
Snell's law states:
n₁ sin θ₁ = n₂ sin θ₂
where n is the index of refraction and θ is the angle of incidence (relative to the normal).
The index of refraction of air is approximately 1. So:
1 sin 30° = 1.52 sin θ
θ ≈ 19°
The angle of refracted ray with respect to normal is 19°.
What is Snell's law?It states that the ratio of sine of angle of incidence and angle of refraction is equal to the refractive index of second medium to the first medium.
sini/sinr =n₂/ n₁
Given the angle of incidence i = 30 degrees, refractive index of glass n₂=1.52, refractive index of air n₁ =1, then , angle of refraction is
1 x sin 30° = 1.52 x sin r
r ≈ 19°
Thus, the angle of refracted ray with respect to normal is 19°.
Learn more about Snell's law.
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Which speed is at at the sound barrier?
The answer is a, 343
In dry air at 20 °C (68 °F), the speed of sound is 343 metres per second (about 767 mph, 1234 km/h or 1,125 ft/s).
The answer is 343 m/s.
A 1.0 cm3 air bubble is released from the bottom of a warm, shallow sea where
the gauge pressure is 1.5 atm. The bubble rises slowly enough that the air inside remains at the same
constant temperature as the water.
(a) What is the volume of the bubble as it reaches the surface?
Answer:what you would do it 1.6*1.6/1.0=V (/=divied *=multiple) and then thats how you would fiqure out V wich V=2.56cm3
hope this helps
Which property allows objects that do not produce their own light to be seen?
Answer:
reflection
Explanation:
Objects that do not produce their own light, reflect light when the light is shone on them.
hope this helps :)