Answer:The property that describes the amount of energy that flows past a given area per unit of time is called energy flux, denoted by S1. It can be calculated by dividing the energy by the area A and the time interval Δ t. The formula for energy flux is S = Energy passing area A in time Δ t A Δ t = u c = ϵ 0 c E 2 = 1 μ 0 E B1. In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section2.
Explanation:
What is a process that returns to its beginning and repeat it self in the same sequence
Answer:
a sequence
Explanation: was that an option?, or was it not a multiple choice question ?
In a cyclic process, the internal energy must not change because the system returns to its beginning state. As a result, according to the first rule of thermodynamics, the system's net work and net heat transfer must balance each other out.
What process returns its beginning and repeat sequence?A cyclic process is one in which the initial and final states are identical. It is a series of operations that ends with the system in the same condition as when it began. As a result, in a cyclic transition, the system's work is equal to its heat absorption.
A cycle is a collection of actions or activities that occur repeatedly in the same manner.
Expansion at constant temperature, heat removal at constant temperature, compression at constant temperature, and addition of heat at constant temperature are all examples of the cyclic process.
Therefore, cyclic process that returns to its beginning and repeat itself in the same sequence.
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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:
It influences blood flow
Answer:
A prolapse is when the valve flaps bulges into the left atrium causing a leak. A prolapse can cause regurgitation. This is when the blood flow is backwards. Stenosis is when the aortic valve is narrowed. This blocks the oxygenated blood flow to the body.
All of these problems effects a proper blood flow and if the flow isn't correct then body tissues that need oxygenated blood won't receive it properly.
Explain temperature change and process of change on a cooling curve:
Answer:
When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, and thereby its temperature increases. ... From solid to liquid at melting point or from liquid to gas at boiling point) is termed as its latent heat.
Process:
A cooling curve is a line graph that represents the change of phase of matter, typically from a gas to a solid or a liquid to a solid. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to.
The initial point of the graph is the starting temperature of the matter, here noted as the "pouring temperature". When the phase change occurs there is a "thermal arrest", that is the temperature stays constant. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to. The amount of energy required for a phase change is known as latent heat. The "cooling rate" is the slope of the cooling curve at any point.
What is a statement that summarizes a pattern found in nature?
Answer:
A scientific law is a statement that summarizes a pattern found in nature.
Explanation:
Answer:
The correct answer will be- scientific law
Explanation:
The pattern that exists in nature appears as the regularities which can be recorded and descriptive through observations. These pattern of nature while recording can be modelled in a mathematical expression.
These patterns which can be expressed in the mathematical terms form the scientific laws which hold true everywhere in the universe. The scientific law once formed never changes.
Thus, a scientific law is the correct answer.
In order to lift the crate, the forklift had to apply force that was greater than force of gravity affecting the crate.
Answer:
had to apply and upward force that was greater than the downward force of gravity affecting the crate.
Explanation:
Answer:
Explanation:
There are two forces acting on the crate. the upward force which is the tension force and the downward force which the force of gravity. a forklift is to lift the crate upwards. This means that the tension force from the forklift must be greater than the force of gravity else the force of gravity will resist it from moving upward
A motor spins a gear with eight teeth. That gear is attached to a gear with 56 teeth. What is the gear ratio
A: 10:1
B: 1:7
C: 1:8
D: 56:1
Answer:
B) 1:7
Explanation:
the question is asking for the ratio of the first gear to the second gear:
first gear:second gear=8:56
we can simplify this ratio:
8:56=1:7
so the correct option should be B
hope this helps
The gear ratio for the motor gear is 1:7. The correct option is B.
What is gear ratio?The gear ratio is the ratio of number of teeth on the first gear or driving gear to the second gear or driven gear.
Given is the teeth on driving gear =8 and the teeth on driven gear =56
Gear ratio = 8:56
Gear ratio = 1:7
Thus, the correct option is B.
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The of the line on a velocity vs. time graph represents acceleration.
Answer:
True
Explanation:
If you are determining whether the statement is true or false, the answer would be true.
A velocity versus time graph can give information about the acceleration of an object. Acceleration is the change in velocity over time, so the line thatis formed by from different points can tell you whether the object has accelerated, decelerated, or is at a constant velocity.
Velocity is placed on the y-axis, while time is on the x-axis. If you see the line or the slope going upwards, this means that the object is accelerating. If the slope is going downwards, this means that the object is decelerating. If the line is parallel to the x-axis then that means the object is at constant velocity.
Answer:
Slope
Explanation:
Keplers laws follow which law discovered by sir Isaac Newton
The Keplers Laws about the motion of planets leds to Newton to discovered the three laws of motion. Newton based on Kepler came to the conclusion that all motion whereas it was follow the same principle.
“Universal Gravitational Law” discovered by Sir Issac Newton followed Kepler’s law.
Explanation:
The acceleration of the moon and objects on the earth are compared by Newton. Gravitational force directly depends on both the object's masses and inversely proportional to square of distance between the center of the objects.
Kepler’s Laws of Motion has been reviewed and Newton developed the proof that elliptical form of planetary orbits resulting the centripetal force which is inversely proportional to square of radius vector.
Gravity anything with mass as gravity we know the earth has gravity because you and I are standing on earth and not floating off into space when we jump we come right back to earth which model best represents the force of gravity pulling us all down to earth?
Answer:
[tex]F=mg[/tex]
Explanation:
Close to Earth's surface, the force of gravity that pulls an object towards the ground is
[tex]F=mg[/tex] (2)
where
m is the mass of the object
g is the acceleration due to gravity, which is [tex]9.81 m/s^2[/tex] close to Earth's surface
This is an approximation of the general formula of gravity valid only close to Earth's surface. The more general formula is
[tex]F=G\frac{Mm}{r^2}[/tex] (1)
where
G is the gravitational constant
M is the Earth's mass
m is the object's mass
r is the distance of the object from Earth's center
At the Earth's surface,
r = R (Earth's radius), and by calling the following factor
[tex]g=\frac{GM}{R^2}[/tex]
we see that eq.(1) becomes eq.(2).
how are families in perodic table determined
1. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
2. All the members of a family of elements have the same number of valence electrons and similar chemical properties.
3. The horizontal rows on the periodic table are called periods.
Instantaneous speed is measured
A. At the starting point
B. When the object reaches its destination
C. At a particular instant
D. Over the duration of the trip
Answer:
C. At a particular instant
Explanation:
Speed is the defined as the ratio between the distance covered by an object and the time taken:
[tex]v=\frac{d}{t}[/tex]
where d is the distance and t the time.
However, there are two possible measurements of speed:
- Average speed: this is the speed measured over a non-zero time interval (for example: a car moving 100 metres in 5 seconds; its average speed is
[tex]v=\frac{100 m}{5 s}=20 m/s[/tex]
- Instantaneous speed: this is the speed of an object measured at a particular instant in time, so for a time interval that tends to zero. So, in the previous example, the average speed is 20 m/s but the instantaneous speed of the car at various instants of time can be different from that value.
What do radio waves and microwaves have in common
Answer:
they are very common
Explanation:
What do radio waves and microwaves have in common?
Both have lower radiant energy than visible light.
Both have higher frequencies than visible light.
Both are located to the right of visible light on the spectrum.
Both have longer wavelengths than visible light.
Answer:
Both are at the side of the spectrum that has the lowest frequency
Explanation:
If electromagnetic waves are arranged in the order of the energy from highest to lowest energy range then we will have
1). Gamma rays
2) X rays
3) Ultraviolet rays
4) Visible light
5) Infrared waves
6) Microwaves
7) Radio waves
Now as per energy range we can say that both microwaves as well as radio waves must have small energy range and longer wavelength as compare to visible light.
SO correct answer is
Both are at the side of the spectrum that has the lowest frequency
the value of efficiency is never 100% or more in practice. why
Answer: Because of presence of friction in most cases as friction exists in ever machine/body, so whenever it works, friction causes heat and sound energy as well, hence, proving that a system cannot be 100% efficient due to friction.
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A track is moving at a fixed speed. FIRST ANSWER THIS QUESTION, If the track moves 30 miles in 25 minutes, find the time it will need to cover 25 miles
THEN, Find the speed of the track AND write a formula that connects D and T. FINALLY, find the coefficient of variation k?
Answer:
im not smart enough, all i figured out is the track is going 1.2 miles every minute
Explanation:
The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about
Answer:
About 1/3 of the weight of the probe on Earth's surface
Explanation:
The weight of the probe is given by
W = mg
where
W is the weigth
m is the mass of the probe
g is the acceleration due to gravity
We notice that:
- m (the mass) is constant, since it depends only on the properties of the probe, so it does not change when the probe moves to Mars
- g' (the acceleration due to gravity on Mars) is 1/3 of g (acceleration due to gravity on Earth)
So, the weight of the probe on Mars surface is
[tex]W' = mg'=m(\frac{1}{3}g)=\frac{1}{3}(mg)=\frac{1}{3}W[/tex]
So, the weight of the probe on Mars surface is 1/3 the weight of the probe on Earth's surface.
[OU.04] The picture below shows two galaxies. What of these statements best describes a similarity between the two galaxies?
Answer:
D.
Explanation: Both have shapes determined by gravitational forces.
Answer: Option (D)
Explanation: A galaxy is considered to be a large and extensive body comprised of the interstellar dust particles, dark matter and variable gases. The above mentioned particles are attached with one another forming variable shapes and are all held by the gravitational force. Gravity is the main factor responsible for the existence of this galaxies.
This is the reason, why the different shaped galaxies exist in the vast space, maintaining some similarity with one another.
Thus the correct answer is Option (D).
Lyndon is investigating whether putting plastic on her windows will help seal out cold winter drafts. She covers a window on the south side of her house with plastic and measures the inside temperature near the window. She also measures the inside temperature near a window without plastic on the north side of her house. The windows are the same size and design. Why is this not an ideal controlled investigation? A. The windows should be different sizes to introduce variation. B. The drafts at each window may be different because the windows aren’t near each other. C. Temperature isn’t a good indicator of cold winter drafts. D. Outside temperature is a better indicator of cold winter drafts than inside temperature. E. The type of plastic used in the investigation isn’t mentioned
Answer:
B. The drafts at each window may be different because the windows aren’t near each other.
Explanation:
The measurement is imprecise since the temperature will be lower in the window that receives the draft directly. that is, if the draft comes from the north, the north window will perceive lower temperatures than the south window.
Answer: B
Explanation: PLATO
the current flowing in an appliance connected to a 120V source is 2A. How many kilowatt-hours of electrical energy does the appliance use in 4h
Answer:
0.96 kWh
Explanation:
First of all, we can find the power of the appliance using the formula:
[tex]P=VI[/tex]
where
V = 120 V is the voltage of the source
I = 2 A is the current
Substituting,
[tex]P(120 V)(2 A)=240 W = 0.24 kW[/tex]
Now we want to find the amount of energy used by the applied in a time of
t = 4 h
The amount of energy is given by
[tex]E=Pt[/tex]
where
P = 0.24 kW
t = 4 g
Substituting,
[tex]E=(0.24 kW)(4 h)=0.96 kWh[/tex]
The appliance uses 0.96 kWh of electrical energy over 4 hours. This is calculated by determining power in kW with the formula P=IV and then multiplying this power by the amount of time in hours.
Explanation:To find out how many kilowatt-hours of electrical energy an appliance uses, we need to calculate power first. In this case, power is provided by the formula P = IV, where I represents current and V represents voltage.
So, P = 2A * 120V = 240W. But, we typically measure electricity in kilowatts (kW), so this would convert to 0.24 kW.
Next, to find energy consumed over a time period, we use E = Pt, where E represents energy, P represents power, and t represents time. Substituting the values, we find E = 0.24 kW * 4h = 0.96 kWh.
So, the appliance uses 0.96 kilowatt-hours of electrical energy in 4 hours when connected to a 120V source and drawing a current of 2A.
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Which balances the equation Mg + O2 — MgO?
Answer:it’s c
Explanation:
I got it right on the test
The more _________ an electron has, the further away it can be from the nucleus. mass
Answer:
ectron's further from the nucleus are held more weakly by the nucleus, and thus can be removed by spending less energy. Hence we say they have higher energy. The Coulomb interaction energy between a nucleus of atomic number and an ele
Answer: the more energy
Explanation:
The Ptolemaic model of the universe describes the earth as
A.at the center, but moving relative to the other planets
B. At the center, stationary, with planets that rotate around it
C. Orbiting around the sun with the other planets of our solar system
D. Orbiting the moon, following the path of the sun
The Ptolemaic model of the universe describes the Earth as being at the center, stationary, with the Sun, the Moon, other planets, stars, and EVERYTHING rotating around it. (B)
Answer:
B. At the center, stationary, with planets that rotate around it
Explanation:
The Ptolemaic model is also known as geocentric model. Ptolemy and Aristotle proposed the Earth to be center of the universe and every other body (planets, moons, stars and sun) to be revolving about in concentric orbits. They considered Earth to be stationary. The observation that the sun seemed to revolve about earth every 24 hours and that the observer on the earth cannot sense motion of Earth supported this model.
Addition of _____________ to pure water causes the least increase in conductivity. A) weak bases B) acetic acid C) ionic compounds D) organic molecules
Answer:
D
Explanation:
Water in itself is a bad conductor of electricity. Any compound that dissociates in water into ions and charged molecules, will increase conductivity of water. In this case ionic compounds weak basis and acids will put in free ions into the water. The ions can pass electricity because they are attracted to respective poles of electricity depending on their charges. In water, these ions are free moving unlike when they are immobilized in their lattice in solid form.
Organic compounds are mainly made of covalent bonds (around carbon) hence do not dissociate in water.
Answer:
the answer is c
Explanation:
i just took it on usatp and its c
The police know that the neighbor across from a house where a murder occurred sits on the porch nearly all day and believe he would have seen or heard something the night the murder took place. However, the neighbor doesn’t want to testify. What might the prosecution need to rely on to ultimately get the neighbor to testify?
a warrant
parole
a subpoena
Miranda rights
a subpoena, i think. hope this helps!! :)
Answer:
A subpoena
Explanation:
In this case, the only witness refuses to testify, so the prosecution needs something from a legal resource to compel the witness to talk. There are resources used by the police and the prosecution to make it happen, for example, create a case of obstruction of justice, or justify probable cause of the neighbor involvement in the murder (way more complicated than it sounds), yet the easiest one is a subpoena, that is nothing more than a "document" or written order by a government agency or court, to create an obligation of the witness to give testimony or suffer a penalty, of course, there are complications, since the prosecution has to prove that the neighbor is the only key witness and that he/she was on the porch at that day and time, but that's another story.
Hope this helps
A ball is dropped off the side of a bridge after falling 1.55 s, what is its velocity.
Answer:
v = 15.19 m/s
Explanation:
As we know that when object is dropped from some height then initial speed of the object is taken as
[tex]v_i = 0[/tex]
now for the final speed of object we can say that if acceleration is constant then the final speed will be given by kinematics equation
[tex]v_f = v_i + at[/tex]
here we have
[tex]a = 9.8 m/s^2[/tex] (due to gravity)
now from this equation of motion
[tex]v_f = 0 + (9.8)(1.55)[/tex]
[tex]v_f = 15.19 m/s[/tex]
Answer:
-15.2
Explanation:
the guy above didn't put a negative when talking about gravity which is always -9.80
To get an electrical current you have to have a ___ ____.
Answer :
curcuit and Source of current .
Answer: you have to have a source of electricity because if not you are not gonna get a "eletrical" current
Which statement describes the energy that a transverse wave carries as its amplitude increases?
It increases and is perpendicular to the motion of the wave.
It decreases and is perpendicular to the motion of the wave.
It increases and is parallel to the motion of the wave.
It decreases and is parallel to the motion of the wave.
Answer:
It increases and is perpendicular to the motion of the wave.
Explanation:
- A transverse wave is a wave in which the oscillation occurs in a direction perpendicular to the motion of the wave (example of transverse waves are electromagnetic waves)
- A longitudinal wave is a wave in which the oscillation occurs in a direction parallel to the motion of the wave (example of longitudinal waves are sound waves)
- The amplitude of a wave is defined as the maximum displacement of the wave relative to the equilibrium position, and the energy carried by the wave is proportional to the square of the amplitude:
[tex]E\propto A^2[/tex]
Therefore, as the amplitude of the wave increases, the energy increases as well.
which of these is an example of a biotic factor that could affect the size of a population A-climate b-disease c-a natural disaster d-water availability
Hey there!
Biotic factors are living organisms. This includes plants, animals, and bacteria. Climate, water, and natural disasters are abiotic factors, which means they are nonliving factors that affect the environment. Disease is caused by bacteria, which is a biotic factor.
Therefore, your answer is B) Disease.
Hope this helps!
Which of the subatomic particles determine the mass of an atom?
Answer:
The number of proton and neutrons.
Explanation:
The mass of an atom is concentrated in the tiny nucleus. Protons and neutrons are massive particles while the mass of electrons are negligible.
It is a common thing to relatively compare the mass of these particles.
If the mass of proton is 1 unit
The mass of neutron would be 1 unit
The mass of electrons would be 1/1840 unit.
We see that electrons have very small mass or negligible mass compared to the neuleons.
This is why when calculating the mass number, we sum the number of protons and neutrons alone.
15 POINTS! What is the function of the nervous system? What is the basic unit of the nervous system?
The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.
The somatic system consists of nerves that connect the brain and spinal cord with muscles and sensory receptors in the skin.
The basic unit of the nervous system is the "nerve cell," called "neuron
Answer:
Sample Response: The nervous system helps the body to respond to internal and external stimuli. Sometimes the stimuli can be dangerous so the nervous system also protects the body. The basic unit of the nervous system is the neuron.
Explanation:
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The Gulf Stream moves water from near Florida northward across the Atlantic and past northwestern Europe . How does the Gulf Stream affect northwestern Europe
The temperature of the Ocean affects weather conditions. Because the Gulf Stream moves warmer water from the North Atlantic towards Europe they actually have warmer winters than other areas do.