Your heart has four valves. Normally, these valves open to let blood flow through your heart, and then shut to keep it from flowing backward. Sometimes the valves don't work properly, causing some or all of the following disorders. In regurgitation, blood leaks back through the valve in the wrong direction. In valve prolapse, the valves have "floppy" flaps and don't close tightly. It's one of the most common heart valve conditions. Sometimes it causes regurgitation. In stenosis, the valve doesn't open enough and blocks blood flow. Based on your knowledge of the heart, explain how regurgitation, valve prolapse, and stenosis each adversely affects blood flow and the oxygenation of body tissues.

Answer:

The mass number of an element is the number of protons plus neutrons.

Explanation:

The mass number of an element is the number of protons plus neutrons, so the correct answer is the option C.

The mass number of an element is the sum of the number of protons plus neutrons.

Answer: Option C

Explanation:

The element's mass number refers to the summative number of neutron and proton in the nucleus. In the nucleus there is the total number of protons and neutron, summed together to form the atomic mass.

Atomic mass is similar as the mass number in representation. Therefore, we have the following formula for the mass number,

Mass number of an element=Number of protons+Number of neutrons

Answer:B.As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

Answer:

B) As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

As we know that electric motor is based on the concept of torque due to magnetic field on current carrying coil.

Here as the current is passing through the coil the torque on the coil is given as

[tex]\tau = NiAB sin\theta[/tex]

so here the magnetic field due to coil will continuously repelling the current carrying coil as it will move between the magnetic field so direction of current in the coil will change continuously so that it will always repel by the magnetic field and continuously rotated between the magnets

C; to get the unit rate or the time it travels per second you divide the total amount traveled by the amount it took to travel. 300/15=20 20•15=300

The average velocity of the car is: C.  20 m/sec.

Given the following data:

To find the average velocity of the car:

Mathematically, average velocity is calculated by using the formula;

[tex]Average \; velocity = \frac{Total \; distance}{Total \; time}[/tex]

Substituting the given parameters into the formula, we have;

[tex]Average \; velocity = \frac{300}{15}[/tex]

Average velocity = 20 meters per seconds.

Therefore, the average velocity of the car is 20 meters per seconds.

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Answer:

homeostasis!

Explanation:

Answer:

The baseball's kinetic energy is 120 joules.

Explanation:

The kinetic energy is defined as:

[tex]k_{e} = \frac{1}{2}mv^{2}[/tex]  (1)

Where [tex]k_{e}[/tex] is the kinetic energy, m is the mass and v is the velocity.

The kinetic energy represents how much energy have an object as a consequence of its movement.

For the case of a baseball (m = 0.15 kg, v = 40.0 m/s):

[tex]k_{e} = \frac{1}{2}(0.15kg)(40.0m/s)^{2}[/tex]

[tex]k_{e} = 120 Kg.m^{2}/s^{2}[/tex]

But 1 j = [tex]kg.m^{2}/s^{2}[/tex]

[tex]k_{e} = 120 j[/tex]

Hence, baseball's kinetic energy is 120 joules.

Answer: Average acceleration is -2.407 [tex]\frac{m}{s^{2}}[/tex]

Explanation:

Average acceleration is equal to change in velocity divided by time taken

therefore, [tex]a=\frac{Vf-Vi}{t}[/tex]

=> [tex]a=\frac{37-89}{6}\times \frac{5}{18}\frac{m}{s^{2}} = -2.407 \frac{m}{s^{2}}[/tex]

Answer: The correct answer is False.

Explanation: The term "raw data" refers to the data that has not been processed or "clean" for use. A scientific journal is a type of publication that specializes in publishing new researches of the scientific field. These researches contain information, that is considered the end product of processing the raw data. It is most likely that raw data would not be used as it comes in published scientific articles.

Answer: It's false

Explanation:

I got it right on edge.

Answer:

A

Explanation:

I believe it is A because reflection is usually like a mirror or in water the other ones described are refraction or conversion. Hope this helps! :)

False. Receiving home care services does not necessarily mean that a patient has a terminal illness.

Terminal illness and homecare services

Home care services are not exclusively for those with terminal illnesses; they cater to various needs.

These services extend beyond end-of-life care, encompassing chronic illness management, post-surgery recovery, palliative care, and support for the elderly.

Home care facilitates personalized healthcare delivery in the comfort of one's residence, promoting independence and enhancing the quality of life.

It is a flexible approach that addresses diverse medical conditions, allowing individuals to receive necessary assistance tailored to their unique health requirements.

Home care services do not exclusively mean a patient has a terminal illness. Home care can include hospice services for those with terminal illnesses, but it also caters to a range of other patient needs, such as recovery and long-term support. Hospice care provides comfort for terminally ill patients, often in their homes. The statement in the question is not true.

If a patient is receiving home care services, it does not necessarily mean they have a terminal illness. While it is true that hospice care is often associated with terminal illnesses and focuses on providing comfort and support rather than cure-oriented treatments, home care can encompass a variety of services for patients with varying needs, including recoveries from surgeries, chronic illnesses, disability support, and more community-based, long-term care. Hospice care, specifically, supports terminally ill patients and their families by offering pain management, emotional support, and the opportunity for the patient to be in the comfort of their own home. However, not all patients in home care are in hospice or have terminal illnesses.

The electron is the subatomic particle that determines an element's reactivity, with the configuration of the outermost or valence shell playing a key role in how readily an element undergoes chemical reactions.

The subatomic particle responsible for determining the reactivity of an element is the electron. The electrons in the outermost subshell, or valence shell, have the most significant interaction with other atoms, as they are farthest from the nucleus. An element is chemically reactive if its valence shell can easily accept or give up electrons. For instance, noble gases like helium and neon have a full valence shell and are very stable—they do not react easily due to their high ionization energies and unwillingness to accept an additional electron. On the other hand, elements like hydrogen have an incomplete valence shell, making them more reactive as they seek stability through reactions with other elements.

Answer:

B. The image is right-left reversed and about as far away from the mirror as the reflected object.

Explanation:

A plane mirror is used in several ways in our life, from the mirror that we have on the bathroom to the mirrors we use on cars, the main difference is that the mirror reflects the image reversed on the Vertical axis, which means that the left is the right and the right is the left, a mirror also protrays objects at a certain distance, about as far away from the mirror as the reflected object but they are actually closer in real life.

Answer:

B. The image is right-left reversed and about as far away from the mirror as the reflected object.

I know this question is old but it still needed an answer :-) hope this helps anyone who needs it!

The Philippine Sea plate is tectonically unusual in that almost all the boundaries are convergent.

The Pacific plate is subducting beneath the Philippine Sea plate to the east while the west/northwestern part of the Philippine Sea plate is subducting beneath the continental Eurasian plate.

Answer: Eurasian

Eurasian plate borders the Philippine plate. The correct option is C.

The Philippine Sea plate has all the boundaries convergent. It is a plate that lies below the lithosphere.

The Pacific plate is shifting beneath the Philippine Sea plate to the east. The west of the Philippine Sea plate is shifting beneath the continental Eurasian plate.

Thus, Eurasian plate borders the Philippine plate. The correct option is C.

Learn more about Philippine plate.

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Answer:

Infrared

Explanation:

Wien's displacement law states that the peak wavelength of the radiation emitted by an object is given by

[tex]\lambda=\frac{b}{T}[/tex]

where

[tex]b=2.898\cdot 10^{-3} m\cdot K[/tex] is the Wien's displacement constant

T is the absolute temperature of the object

In this problem,

T = 1000 K

So the peak wavelength of the radiation emitted by the body is

[tex]\lambda=\frac{2.898\cdot 10^{-3} m\cdot K}{1000 K}=2.90\cdot 10^{-6} m = 2.90 \mu m[/tex]

And this corresponds to infrared radiation, whose range of wavelength is 700 nm - 1 mm.

Answer:

The correct answer is visible light.

Explanation:

B) Enriching the soil.

Hope this helps.

I believe the answer is B) enriching the soil. Bacteria converts energy in would organic matter into forms useful to the rest of the organization in the soil food web.

The suns gravity pulls on the planets and keeps them in place. Its gravitational pull puts them in orbit around the sun

The role of the sun's gravity is to keep the planets in place.

To learn more about the sun's gravity refer to:

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Answer:

A positive charge with very small charge compared to the charge source of the field

Explanation:

Let's consider an electric field produced by a source charge Q.

In order to test the direction and magnitude of the electric field, we use a positive test charge q. The reason for chosing a positive charge is that a positive charge will move following the directions of the electric field lines (in fact, the positive charge will be repelled from charge Q if charge Q is positive, so it will follow the electric field lines, which point away from the charge).

Moreover, the test charge q must be small compared to charge Q. This is because we don't want to modify significantly the configuration of the electric field, so the test charge q must be negligible compared to charge Q.

Electromagnetic waves carry energy in the form of photons. Nuclear energy is released during changes in the structure of a nucleus. Thermal energy is the result of movement and vibration of molecules. Potential energy is associated with an object's position.

Energy from electromagnetic waves: Electromagnetic waves, such as light, carry energy in the form of photons. These waves can be used to transfer energy and gather information. For example, sunlight carries energy from the sun to the Earth, which can be used for photosynthesis in plants.

Energy caused by changes in the structure of a nucleus: Nuclear energy is released when the structure of a nucleus changes, such as in nuclear fission or fusion reactions. This energy is used in nuclear power plants to generate electricity.

Energy resulting from movement and vibration of molecules: Thermal energy, also known as heat energy, is the energy resulting from the movement and vibration of molecules. It is a form of kinetic energy and is responsible for temperature changes and heat transfer.

Energy an object has because of its position: Potential energy is the energy an object possesses due to its position or condition. For example, a raised object has gravitational potential energy, and a compressed spring has elastic potential energy.

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The examples correspond to Radiant Energy (energy from electromagnetic waves), Nuclear Energy (energy caused by changes in a nucleus), Thermal Energy (energy resulting from movement and vibration of molecules), and Potential Energy (energy an object has because of its position).

For the given examples, the corresponding forms of energy are:

These are the major types of energy that correspond to the scenarios described in your question. Each of these forms plays a vital role in different physical and biological systems.

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Every moving object has kinetic energy.

The kinetic energy a moving object has is

(half of its mass)

multiplied by

(the square of its speed).

Answer: He did none.

Explanation:

Even though he may have felt like he did work, none was done.

The only way for work to happen is if the object moves.

Answer:

Zero

Explanation:

Work done on an object is defined as the product of force applied on an object and the distance traveled by the object due to the applied force. here the force applied is in the direction of force.

Generally,

Work = force in the direction of displacement x displacement

Here, the displacement is zero

so, the work done by Luke to push the wagon is zero.

Answer:

9090 m, 104 s

Explanation:

After the acceleration phase, the rocket reaches a height of:

x = x₀ + v₀ t + ½ at²

x = (0 m) + (0 m/s) (30 s) + ½ (10 m/s²) (30 s)²

x = 4500 m

And it reaches a velocity of:

v = at + v₀

v = (10 m/s²) (30 s) + (0 m/s)

v = 300 m/s

After the fuel runs out, the rocket goes into free fall.  The maximum height reached is:

v² = v₀² + 2a(x - x₀)

(0 m/s)² = (300 m/s)² + 2(-9.8 m/s²)(x - 4500 m)

x ≈ 9090 m

The time to reach maximum height during free fall:

v = at + v₀

0 m/s = (-9.8 m/s²) t + (300 m/s)

t ≈ 30.6 s

And the time to land from the maximum height:

x = x₀ + v₀ t + ½ at²

0 m = (9090 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

t ≈ 43.1 s

So the total time is:

t = 30 s + 30.6 s + 43.1 s

t ≈ 104 seconds

scaler quantity has magnitude only for example mass ,speed,distance,electric current

Answer:

period of orbit around sun ! thats a saturn year

Explanation:

Answer:

27 J/(mol • K)

Explanation:

γ = Cp / Cv

We're given γ and we need to find Cp (heat capacity at constant pressure) per mole.  First we need to find Cv (heat capacity at constant volume).  Cv is defined as:

Cv = Cp − nR

where n is the number of moles and R is the ideal gas constant.

So:

γ = Cp / (Cp − nR)

γ (Cp − nR) = Cp

γ Cp − γnR = Cp

(γ − 1) Cp = γnR

Cp / n = γR / (γ − 1)

Given γ = 1.44 and R = 8.314 J/mol/K:

Cp / n = (1.44) (8.314 J/mol/K) / (1.44 − 1)

Cp / n = 27 J/mol/K

The answer is 31.67 Amps.

To solve the problem, we need to use Ohm's Law equation, which states that:

[tex]V=IR[/tex]

Where,

V, is the voltage (in volts)

I, is the current (in Amps)

R, is the resistance (in Ohms)

We are given the following information:

[tex]Voltage=190v\\Resistance=6\Omega\\[/tex]

So, using Ohm's Law equation and substituting the given information, we have:

[tex]V=IR\\\\190v=I*6\Omega\\\\I=\frac{190v}{6\Omega}=31.67Amps[/tex]

Hence, we have that the current used by the blender is 31.67Amps.

Have a nice day!

Answer:

We experience interference while listening to the radio. A radio station works by sending and receiving radio waves. Since the radio waves are being interfered with other waves which must have a wave nature.

The interference is the net result of two individual waves. It can be constructive or destructive interference and is the property of waves and not particles.

This interference is an example of electromagnetic radiation. Thus we experience wave behavior of electromagnetic radiation in our daily communications.

Answer: wave behavior

Explanation:

Answer:

A divergent boundary is the answer

Explanation:

Answer: the centripetal acceleration is changed by a factor of four

Explanation:  An object moving in a circular motion at constant speed has zero tangential acceleration but the direction of the tangential velocity vector changes as the object rotates. This change in direction of the tangential velocity vector results in centripetal acceleration ([tex]a_c[/tex]) given by

[tex]a_c=\frac{v^{2}}{r}[/tex]

where v=speed of object , r= radius of circular path

Thus if [tex]v_2=2v_1[/tex] then

[tex]a_2=\frac{v_2^{2}}{r_2}=\frac{(2v_1)^{2}}{r_1}=4\times \frac{v_1^{2}}{r_1}=4a_1[/tex]

Thus If the speed is doubled, the centripetal acceleration is changed by a factor of four .

Final answer:

The centripetal acceleration will increase by a factor of 4 when the speed of an object in circular motion is doubled, because centripetal acceleration is proportional to the square of the velocity.

Explanation:

An object is traveling in circular motion at constant speed. When the object's speed is doubled, its centripetal acceleration is affected significantly because the acceleration in circular motion is directly proportional to the square of the velocity. The formula for centripetal acceleration (ac) is ac = v² / r, where v is the speed of the object and r is the radius of the circular path.

Since the relationship is quadratic, if you double the speed (v becomes 2v), the new acceleration will become (2v)² / r = 4v² / r. This shows that the centripetal acceleration will increase by a factor of 4, which is the square of the factor by which the speed is increased.

Answer:

B.

The explanation of the relationship between load and extension is not in Hooke's Law.

Explanation:

Answer:

theory

Explanation:

I just took the test! hope this helps!

Answer:

If the speed of an object is unchanging it means that it's traveling at a constant speed.

If the speed of the object increases or decreases it means that the speed is changing. That's why those options are not valid.

The average speed implies that the speed changes over time, but just the average remains the same. That's why this option is not valid.

If the speed of an object is unchanging, then the object is traveling at a constant speed.

"Unchanging" and "constant" mean the same thing.