as the flow becomes narrower, more pressure is exerted because the pressure is greater
Final answer:
As the river channel narrows, the water velocity increases due to the same volume of water needing to pass through a smaller area, speeding up the motion of a whitewater raft. This effect is similar to narrowing the opening of a hose to increase water speed.
Explanation:
The flow rate equation helps explain how the motion of a whitewater raft changes as the river channel becomes narrower by considering the flow velocity, which is influenced by the hydraulic radius, channel slope, and channel roughness. In simpler terms, the flow rate (Q) is the volume of water that moves past a point in a given time and is calculated by Q = wdv, where w is the width of the channel, d is the depth of the channel, and v is the velocity of the water.
When the river channel narrows, the same volume of water (discharge) must pass through a smaller cross-sectional area. Consequently, the velocity of the water increases, which can be thought of like putting a thumb over the end of a hose to speed up the water. This increase in velocity will cause the whitewater raft to move faster downstream when the channel is narrower.
Moreover, factors such as rain or snow melt can lead to an increase in discharge, which would further contribute to an increase in the velocity of the water in the narrowed parts of the river. On the contrary, as the channel widens downstream, the current generally slows, which may result in increased sedimentation and a slower moving whitewater raft.
Based on the second law of thermodynamics, how would you expect a system to change over time?
A.It would become more organized
B.Its randomness would increase
C.It would become more efficient
D.Its energy would increase
Answer: B. Its randomness would increase
Explanation:
According to the second law of thermodynamics:
"The amount of entropy in the universe tends to increase over time"
That is, in any cyclic process, entropy will increase, or remain the same.
So, in this context, entropy is a thermodynamic quantity defined as a criterion to predict the evolution or transformation of thermodynamic systems. In addition, it is used to measure the degree of organization of a system.
In other words: Entropy is the measure of the disorder (or randomness) of a system and is a function of state.
An object is placed a distance of twice the focal length away from a diverging lens. What is the magnification of the image?
Answer:
1/3
Explanation:
We can solve the problem by using the lens equation:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where
f is the focal length
p is the distance of the object from the lens
q is the distance of the image from the lens
Here we have a divering lens, so the focal length must be taken as negative (-f). Moreover, we know that the object is placed at a distance of twice the focal length, so
[tex]p=2f[/tex]
So we can find q from the equation:
[tex]\frac{1}{q}=\frac{1}{(-f)}-\frac{1}{p}=-\frac{1}{f}-\frac{1}{2f}=-\frac{3}{2f}\\q=-\frac{2}{3}f[/tex]
Now we can find the magnification of the image, given by:
[tex]M=-\frac{q}{p}=-\frac{-\frac{2}{3}f}{2f}=\frac{1}{3}[/tex]
Water thtat is returned to the environment after secondary treatment is known as _____.
The answer is C) Effluent
It's best to start at a higher level when participating in competitive sports. Please select the best answer from the choices provided. T F
Answer: false
Explanation:
At the beginning level or novice level the player should involve in a sport at a lower level. This is because of the fact that if he starts at a higher level the player may have to perform responsibilities accordingly. The player at the higher level have to decide the strategy of the competitive sport which an experienced player can justify. But a beginner cannot take such responsibilities and the sports skills of such person may not be good.
A force that pushes or pulls is known as A. A reaction force. B. An expected force. C. A positive force. D. An applied force.
I believe it’s D, an applied force.
A reaction force seems to refer to Newton’s third law, but is relatively vague to be the answer to this question.
An expected force isn’t a concept nor the name of any subject of forces that is taught within the physics textbooks.
A positive force refers to direction, a negative force can have less, equal, or even more magnitude than the positive force, thus it contradicts itself. As that’s still a force that can push or pull.
So I believe it to be D.
A force that pushes or pulls is known as an applied force. Option D is correct.
What is force?Force is defined as an object in motion, and its rate of change of momentum is called force.
here,
A force applied to an object is one that is exerted on it by another object or by an external agent. This force can cause the object to accelerate or change direction. Pushing a book across a table, pulling a sled across the snow, or lifting a weight with a pulley are all examples of applied forces.
It is important to note that for every applied force, there is an equal and opposite reaction force, according to Newton's third law of motion. This means that when an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object. This reaction force is also an applied force, and it can affect the motion of both objects involved.
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The magnetic field lines of a bar magnet spread out from the north end to the south end. South end to the north end. Edges to the center. Center to the edges.
the north end to the south end.
Explanation;Magnetic field lines from a bar magnet form lines that are closed. The direction of magnetic field is taken to be outward from the North pole of the magnet and in to the South pole of the magnet. A magnetic field refers to the area surrounding a magnet where a force is exerted on certain objects. These lines are spread out of the north end of the magnet.The magnetic field lines resemble a bubble.Answer
the answer is option A/ "north end to the south end"
Explanation:
A _____ is a particle with a positive charge and the mass of an electron.
A positron, or an anti-electron, is a particle with a positive charge and the mass of an electron.
If the kinetic and potential energy in a system are equal, then the potential energy increases
Answer: less
Explanation:
An electron travels with speed 6.0 106m/s between the two parallel charged plates shown in the figure. The plates are separated by 1.0 cm and are charged by a200 V battery.What magnetic field strength will allow the electron to pass between the plates without being deflected?
Answer:
3.3 mT
Explanation:
First of all, we need to find the strength of the electric field between the two parallel plates.
We have:
[tex]\Delta V=200 V[/tex] (potential difference between the two plates)
[tex]d=1.0 cm=0.01 m[/tex] (distance between the plates)
So, the electric field is given by
[tex]E=\frac{\Delta V}{d}=\frac{200 V}{0.01 m}=2\cdot 10^4 V/m[/tex]
Now we want the electron to pass between the plates without being deflected; this means that the electric force and the magnetic force on the electron must be equal:
[tex]F_E = F_B\\qE=qvB[/tex]
where
q is the electron charge
E is the electric field strength
v is the electron's speed
B is the magnetic field strength
In this case, we know the speed of the electron: [tex]v=6.0\cdot 10^6 m/s[/tex], so we can solve the formula to find B, the magnetic field strength:
[tex]B=\frac{E}{v}=\frac{2\cdot 10^4 V/m}{6.0\cdot 10^6 m/s}=0.0033 T=3.3 mT[/tex]
The magnetic field strength will allow the electron to pass between the plates without being deflected is 0.0033 T.
Electric field strengthThe electric field strength of the electron is calculated as follows;
E = V/d
E = 200/(0.01)
E = 20,000 V/m
Magnetic field strengthThe magnetic field strength is related to electric field in the following formula;
qvB = qE
vB = E
B = E/v
B = (20,000)/(6 x 10⁶)
B = 0.0033 T
Thus, the magnetic field strength will allow the electron to pass between the plates without being deflected is 0.0033 T.
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How does the electric force between two charged particles change if the distance between them is decreased by a factor of 3?
It makes them be three forces
What is the melting point of substance A?
°C
Answer:
200
Explanation:
Melting point of a substance is 200.
What is Melting point?The temperature at which a solid and liquid phase can coexist in equilibrium and the point at which matter transforms from a solid to a liquid is known as a substance's melting point. Pure solutions and liquids fall within this definition.
It is important to specify melting point because it relies on pressure. Melting point tables frequently use standard pressures like 100 kPa or 1 atmosphere. The liquefaction point is another name for the melting point.
The temperature at which a liquid changes to a solid (the reverse of melting) is the freezing point or crystallization point. The freezing point and the melting point do not necessarily occur at the same temperature.
Therefore, Melting point of a substance is 200.
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Chet believes that electric fields can impact objects only when the objects are in direct contact. Tonya disagrees with Chet. What evidence can Tonya use to prove Chet incorrect? A) A balloon will stick to a wall only if the balloon has no overall charge. B) Two negatively charged balloons will repel each other when brought close together without touching. C) An atom's neutrons and electrons are located in its nucleus. D) Rubbing a plastic rod with a silk cloth transfers neutrons from the cloth to the rod.
B because it is the only evidence that displays an effect from the field without contact
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is?
The most common atom of iron has 26 protons and 30 neutrons in its nucleus. What are its atomic number, atomic mass, and number of electrons if it is electrically neutral? This atom has atomic number 26, atomic mass 56, and has 26 electrons.
Answer :The mass number is 56.
Explanation:
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons = 26+ 30 =56
Atomic number is defined as the number of protons or number of electrons that are present in an atom.
Atomic number = Number of electrons = Number of protons = 26
Hence, neutrons and protons affects the mass number and thus the mass number will be 56.
Squid rely on jet propulsion when a rapid escape is necessary A 1.5 kg squid at rest pulls 0.10 kg of water into its mantle, then ejects this water at a remarkable 45 m/s. Right after this ejection, how fast is the squid moving? Express your answer with the appropriate units.
Answer:
-3 m/s
Explanation:
The problem can be solved by using the law of conservation of momentum.
In fact, the system squid+water inside is initially at rest, so the total momentum is zero:
[tex]p_i=0[/tex]
while the final momentum is:
[tex]p_f = m_s v_s + m_w v_w[/tex]
where
[tex]m_s=1.5 kg[/tex] is the mass of the squid
[tex]v_s[/tex] is the velocity of the squid
[tex]m_w = 0.10 kg[/tex] is the mass of water
[tex]v_w = 45 m/s[/tex] is the water velocity
Since the total momentum must be conserved,
[tex]p_i = p_f = 0[/tex]
So we have
[tex]m_s v_s + m_w v_w =0\\v_s = -\frac{m_w v_w}{m_s}=-\frac{(0.10 kg)(45 m/s)}{1.5 kg}=-3 m/s[/tex]
where the negative sign means the direction is opposite to that of the water.
The final velocity of the squid after the ejection of the water is 3 m/s backwards.
The given parameters;
mass of the squid, m₁ = 1.5 kginitial velocity of the squid, u₁ = 0mass of water, m₂ = 0.1 kginitial velocity of the water, u₂ = 0final velocity of the ejection, v₂ = 45 m/sApply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
1.5(0) + 0.1(0) = 1.5v₁ + 45(0.1)
0 = 1.5v₁ + 4.5
1.5v₁ = -4.5
[tex]v_1 = \frac{-4.5}{1.5} \\\\v_1 = -3 \ m/s[/tex]
Thus, the final velocity of the squid after the ejection of the water is 3 m/s backwards.
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While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find the motion somewhat unpleasant. To take your mind off your stomach, you wonder about the motion of the ride. You estimate the radius of the big wheel to be 15 m, and you use your watch to find that each loop around takes 25 s. What are your speed and magnitude of your acceleration? What is the ratio of your apparent weight to your true weight at the top of the ride? What is the ratio of your apparent weight to your true weight at the bottom?
ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh this confused mee
Doubling an objects speed will have what effect on its potential energy due to gravity
An object's gravitational potential energy is
(mass) x (gravity) x (height above ground) .
I don't see the object's speed anywhere in that formula, do you ?
An object's speed has no effect whatsoever on its potential energy ... only if it changes the object's height above ground.
Una esfera homogénea de radio r y peso W resbala en un piso bajo la acción de una fuerza horizontal constante P aplicada a una cuerda, como se muestra en la Fig. 1. (a) Demostrar que, si ? es el coeficiente de rozamiento entre la esfera y el piso, la altura h está dada por h = r (1 – ?W/P). (b) Demostrar que la esfera no se encuentra en equilibrio de traslación bajo estas circunstancias. (c) Si se escoge un valor diferente de h, ?se puede lograr que la esfera se encuentre tanto en equilibrio de rotación como de traslación? ?Y si se escoge una dirección diferente para P? Dar una explicación de lo que ocurre.
Pike's peak in colorado is approximately 4,300 m above sea level (0). what is the boiling point of water at the summit?
Answer:
The boiling point of water is around 185.9ºF or 85.5ºC
Explanation:
The boiling point of water depends on the atmospheric pressure. So, the higher the elevation, the lower the atmospheric pressure, therefore the boiling point of water is lower as well. Assuming that sea level pressure is constant ,(760 mmHg, 29.92inches Hg or 14.69psi) the boiling point of water is 212ºF (100ºC). Approximately, for every 500 foot (150m) of elevation increase, the boiling point temperature decreases 1ºF (0.55ºC).
A skydiver is falling at constant velocity. If a force of 600 N is pulling down on the skydiver, how much force must be acting upward on the skydiver?
exactly 600 N
slightly more than 600 N
slightly less than 600 N
exactly 0 N
Well, if the skydiver is at constant velocity, than there’s no acceleration, as stated by Newton’s first law. Thus the total net force would equate to 0. In order to make this statement true, the answer would have to be exactly 600 N.
Force is defined as the product of mass and acceleration .it is a vector quantity. The force acting on the skydiver must be 600 N which should be acting upward.
what is force?Force is defined as the action on any object that has the ability to change the shape, size, and direction of an object is in motion or in static condition.
It is a vector quantity defined as the product of mass and acceleration. Acceleration is the rate change of velocity with respect to the time
Force is given by;
[tex]\rm {Force = Mass \times Acceleration}[/tex]
As the definition of acceleration if the velocity change is zero in that condition the force acting is zero. that's why force will also be zero
[tex]\rm {F +ma+mg =0 }[/tex]
If acceleration is zero in that condition
[tex]\rm {F =-mg }[/tex]
[tex]\rm {F = -600 N }[/tex]
where - ve shows the direction of force is negative
therefore a force of exactly 600 N is acting upward on the skydiver.
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What causes different colors to appear in the sky?
Answer : the scattering and reflection of light by dust particles
The sky appears blue because the blue wavelength of light from the sun is scattered more by the air molecules that the other colors. The sky appears with a red hue at dawn and sunsets because the red spectrum is able to pass through the longer atmosphere in the oblique angle while blue light is scattered well before.
Answer: the scattering and reflection of light by dust particles
Explanation:
A 4.0 kilogram object is dropped from a height of 1.0 meter onto a spring with a spring constant of 850 newtons per meter. Approximately what distance will the spring compress when the object lands on it? (1) 3.0 dm
(2) 9.0 cm
(3) 9.0 mm
(4) 2.0 dm
Show calculations
To determine the compression of the spring when a 4.0 kg object is dropped from 1.0 meter, we use the conservation of energy principle. The gravitational potential energy of the dropped object is converted into the spring's elastic potential energy. Calculations show the spring will compress approximately 9.0 cm.
Explanation:We can solve the problem of the 4.0 kilogram object being dropped onto a spring by considering the conservation of energy. The gravitational potential energy at the height of 1.0 meter will convert into the elastic potential energy of the spring once the spring is compressed and the system momentarily comes to rest.
The gravitational potential energy (PE) can be calculated using the formula PE = mgh, where m is the mass, g is the acceleration due to gravity (9.8 m/s2), and h is the height from which the object is dropped. Therefore, PE = 4.0 kg * 9.8 m/s2 * 1.0 m = 39.2 Joules.
The elastic potential energy stored in a compressed spring is given by the formula PEspring = 1/2 * k * x2, where k is the spring constant and x is the compression distance. Setting the gravitational potential energy equal to the spring's elastic potential energy gives 39.2 J = 1/2 * 850 N/m * x2. Solving for x gives x = sqrt((2 * 39.2) / 850) which approximately equals 0.09 meters or 9.0 cm.
Each croquet ball in a set has a mass of 0.53 kg. The green ball, traveling at 14.4 m/s, strikes the blue ball, which is at rest. Assuming that the balls slide on a frictionless surface and all collisions are head-on, find the final speed of the blue ball in each of the following situations: a) The green ball stops moving after it strikes the blue ball. Answer in units of m/s.b) The green ball continues moving after the collision at 2.4 m/s in the same direction. Answer in units of m/s. c) The green ball continues moving after the collision at 0.9 m/s in the same direction. Answer in units of m/s.
a) 14.4 m/s
The problem can be solved by using the law of conservation of total momentum; in fact, the total initial momentum must be equal to the final total momentum:
[tex]p_i = p_f[/tex]
So we have:
[tex]m_g u_g + m_b u_b = m_g v_g + m_b v_b[/tex] (1)
where
[tex]m_b = m_g = m = 0.53 kg[/tex] is the mass of each ball
[tex]u_g = 14.4 m/s[/tex] is the initial velocity of the green ball
[tex]u_b = 0[/tex] is the initial velocity of the blue ball
[tex]v_g=0[/tex] is the final velocity of the green ball
[tex]v_b[/tex] is the final velocity of the blue ball
Simplifying the mass in the equation and solving for [tex]v_b[/tex], we find
[tex]v_b = u_g = 14.4 m/s[/tex]
b) 12.0 m/s
This time, the green ball continues moving after the collision at
[tex]v_g = 2.4 m/s[/tex]
So the equation (1) becomes
[tex]u_g = v_g + v_b[/tex]
And solving for [tex]v_b[/tex] we find
[tex]v_b = u_g - v_g = 14.4 m/s-2.4 m/s=12.0 m/s[/tex]
c) 13.5 m/s
This time, the green ball continues moving after the collision at
[tex]v_g = 0.9 m/s[/tex]
So the equation (1) becomes
[tex]u_g = v_g + v_b[/tex]
And solving for [tex]v_b[/tex] we find
[tex]v_b = u_g - v_g = 14.4 m/s-0.9 m/s=13.5 m/s[/tex]
Final answer:
To find the final speeds of the blue ball after the green ball collides with it, the conservation of momentum principle is used, considering the green ball's various final speeds post-collision for each situation. The final speeds of the blue ball are 14.4 m/s, 12.0 m/s, and 13.5 m/s, respectively.
Explanation:
The problem involves conservation of momentum during collisions, as the surface is considered frictionless, and energy is conserved during perfectly inelastic collisions (although the question does not specify if the collisions are perfectly elastic or inelastic).
To solve for the final speed of the blue ball in each given situation, we'll apply the principle of conservation of momentum, which states that the total momentum before the collision is equal to the total momentum after the collision.
Calculating the Final Speeds
When the green ball stops: Conservation of momentum implies that the momentum of the green ball before the collision is transferred entirely to the blue ball. Therefore, the blue ball's final speed will be the same as the initial speed of the green ball, i.e., 14.4 m/s.When the green ball continues at 2.4 m/s: The momentum lost by the green ball is gained by the blue ball. By conserving momentum, the final speed of the blue ball can be found and is calculated to be 12.0 m/s.When the green ball continues at 0.9 m/s: Again, by conserving momentum, the final speed of the blue ball is calculated to be 13.5 m/s.A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring 17 feet. The ball is started in motion from the equilibrium position with a downward velocity of 4 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second) . Suppose that after t seconds the ball is y feet below its rest position. Find y in terms of t. (Note that the positive direction is down.) Take as the gravitational acceleration 32 feet per second per second.
Final answer:
To find the position of the ball, y, in terms of time, t, we need to consider the forces acting on the ball. The weight of the ball and the force due to air resistance act in opposite directions. By using Newton's second law and integrating the velocity function, we can determine the position function of the ball.Therefore, the position of the ball, y, in terms of time, t, is given by y(t) = -(gt²)/2
Explanation:
To find the position of the ball, y, in terms of time, t, we need to consider the forces acting on the ball. The weight of the ball, mg, and the force due to air resistance, 4v, act in opposite directions. The net force can be calculated using Newton's second law, F = ma.
Using the equation F = ma, we have mg - 4v = ma. Rearranging the equation to solve for v, we get v = (mg - ma)/4. Substitute the given values of m = 0.096 kg, g = 9.8 m/s², and a = 0.075 m/s²into the equation to find v. Then, integrate the velocity function to find the position function y(t).
After solving the integration, we get y(t) = -(gt²)/2 + C, where C is the constant of integration. To find the value of C, we can use the initial condition y(0) = 0. Substituting the values, we find C = 0.
Therefore, the position of the ball, y, in terms of time, t, is given by y(t) = -(gt²)/2
In a pig-calling contest, a caller produces a sound with an intensity level of 60 db. how many such callers would be required to reach the pain level of 120 db? 2 incorrect: your answer is incorrect.
The imaginary second level is 60 dB more intense than the real level of the caller.
60 dB means a multiplication of 10⁶ = 1 million.
That's how many equally-talented callers it would take to be 60 dB louder than him.
The number of callers would be required to reach the pain level of 120 db is 10⁶ , that is, one million.
What is one decibel?
Decibel is the unit of sound. Its symbol is ‘dB’. We can define decibel as:
A unit of measurement used to express the ratio of one value of a power or field quantity to another on a logarithmic scale, the logarithmic quantity being called the power level or field level, respectively.
60 dB = 10 log₁₀ (P₁/P)
120 dB = 10 log₁₀( P₂/P₀)
The man have to produce square of his intensity level to reach the pain level of 120 dB.
The number of callers would be required to reach the pain level of 120 db is 10⁶ , that is, one million.
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A 1.2 nf parallel-plate capacitor has an air gap between its plates. Its capacitance increases by 3.0 nf when the gap is filled by a dielectric
What is the dielectric constant of that dielectric?
The dielectric constant of the dielectric material is 3.5.
Explanation:Given that the capacitance of the parallel-plate capacitor without the dielectric is 1.2 nF, and the capacitance increases by 3.0 nF when the gap is filled with the dielectric, we can find the dielectric constant using the equation:
C' = KC
Since the original capacitance is 1.2 nF and the increased capacitance is 1.2 + 3.0 = 4.2 nF, we can plug these values into the equation and solve for K:
KC = C'
K * 1.2 nF = 4.2 nF
K = 4.2 nF / 1.2 nF = 3.5
Therefore, the dielectric constant of the dielectric material is 3.5.
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Help DUE TONIGHT!
use the picture below to answer the question. What is the total length of one complete wave (the distance from one point on a wave to the next similar point) called?
amplitude
frequency
pitch
wavelength
I have found this tool to hep you solve your question.
https://quizlet.com/76366884/ch15ch16physical-science-waves-sound-flash-cards/
Some forces require direct contact,while others, like gravity, act at a distance
Yes sirree ! Uh huh, uh huh. Truer words are rarely spoken.
What type of electromagnetic radiation travels the fastest?a) radio waves b) sound waves c) X-rays d) infrared rays e) All of the above
All electromagnetic waves have the same speed when they're all in the same medium.
Note: Sound waves don't belong on this list, because they're not electromagnetic waves. The speed of sound in air is only about 0.0001 percent of the speed of electromagnetic waves in air.
Based on the second law of thermodynamics why must a machine always be less than 100% efficient?
A.Heat never moves from cold to hot.
B.Heat is never converted completely into mechanical energy.
C.Heat never flows from hot to cold.
D.Entropy never increases.
Answer: B.Heat is never converted completely into mechanical energy.
Explanation:
According to the second principle of thermodynamics:
"The amount of entropy in the universe tends to increase over time"
However the first formulation of this law (by Sadi Carnot) states:
"There is an upper limit to the efficiency of conversion of heat to work, in a heat engine "
This means the heat cannot be completely transformed into mechanical energy in a machine. That is why a machine's effieciency is always less than 100%
Answer:
B
Explanation:
Use logic
Natalia is studying a wave produced in her magnetics lab. This wave can move through the empty space in a vacuum and carries a lot of energy.
Answer:
You forgot to put the question it's asking but its Gamma ray
Explanation:
Natalia is studying a wave produced in her magnetics lab. This wave can move through the empty space in a vacuum and carries a lot of energy.
What wave is Natalia most likely studying?
Gamma ray is the answer
could i possibly have a brainlist pwease