Which two measuring devices would most likely be used to measure the speed of
water in a stream?

Answer:

 Scientists at IIT Roorkee are testing a floating device that can generate electricity from flowing surface water of rivers and streams, paving the way for an alternative source of renewable energy.

Explanation:

hope it helps my dear friend.

This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Answer:

It will not. The thing with wind is as long as the earth rotates and creates and uneven heating of the atmosphere, there will be infinite wind.

Explanation:

The energy of the characteristic x-ray emitted from a tungsten target 1.36*10³ eV.

The energy of a characteristic x-ray emitted from a tungsten target when an electron drops from an M shell (n=3 state) to a vacancy in the K shell (n=1 state) can be estimated using the equation E =hcZ²Δn²/n². Here Z is the atomic number for tungsten (Z=74) and Δn is the difference between n1, the initial orbital, and n2, the final orbital, (n1 - n2). In this case n1= 3 and n2= 1 giving (3-1=2).

Using the equation E =(hc*74²*2²)/1² = (6.63*10-34*.993*17576)/1= 1.36*10³ eV. Therefore, the estimated energy of the characteristic x-ray emitted from the tungsten target when an electron drops from the M shell (n=3) to a vacancy in the K shell (n=1) is approximately 1.36*10³ eV.

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Answer:

177.87

Explanation:

acellus

The potential difference between the points A and B is 177.9 V.

Potential difference between any two points is the amount of work required to move a unit positive charge along any path from point A to point B without accelerating is referred to as the electric field.

Here,

The charge on the particle, q = +0.00235 C

The change in electric potential energy, ΔU = 0.418 J

The potential difference can be defined as the electric potential energy per unit charge.

Therefore, the potential difference between A and B,

V = ΔU/q

V = 0.418/0.00235

V = 177.9 Volt

Hence,

The potential difference between the points A and B is 177.9 V.

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Answer:

I'm not positive but I think the answer is Yes, because both scientific laws and theories are based on evidence.

Explanation:

Sorry I don't have notes on this, hope this helps! :)

Answer: 1.4

Explanation:

2.5/.25 = 10

sqrt(20/10) =1.4

The speed of the wave on the stretched string is 1.41 m/s.

To calculate the speed of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into the equation 1

Hence, the speed of the wave on the stretched string is 1.41 m/s.

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Answer:

100Ns

Explanation:

find velocity and then plug into momentum formula momentum=(velocity)(mass)

Answer:

5,000 kg-m/s going south

Explanation:

Since you're only given mass and height, not velocity. You have to find velocity first. The equation for velocity is v=2gh. We know gravity is 10 since it's given & height is also given which is 125m. After doing the math, it's 2,500. Now that you have velocity, you can plug velocity into the formula for momentum which is p=mv. 2.0 times 2,500 = 5,000 kg-m/s going south.

Нам не дано коэффициент трения, значит, можно не учесть силу трения. От этого, по второму закону Ньютона, F=ma=5×20=100 Н.

И это всё!

When considering the excited-state energies of a system of interacting particles, it is important to take into account the Coulomb interaction between the particles.

In a system of particles that interact through the Coulomb potential, the excited-state energies will generally be affected by the Coulomb interaction between the particles. The Coulomb potential describes the interaction between charged particles, such as electrons and protons.

In the case of atoms, the excited states are typically formed by promoting an electron to a higher energy level. If we consider the Coulomb interaction between the electrons and the nucleus, the excited-state energies will be affected by the degree of attraction or repulsion between the electron and the nucleus. The excited-state energies will depend on the distance between the electron and the nucleus, as well as the charge of the nucleus and the electron.

Similarly, in molecules, the excited states are formed by promoting an electron from a lower energy level to a higher energy level. The Coulomb interaction between the electrons and the nuclei in the molecule will also affect the excited-state energies. The excited-state energies will depend on the positions of the atoms in the molecule, as well as the charges and positions of the electrons.

In general, the Coulomb interaction between particles can cause the excited-state energies to shift and split into sub-levels, due to the repulsion and attraction between the charged particles. The Coulomb interaction can also affect the probability of transitioning between different excited states, due to the different energy differences between the states. Therefore, when considering the excited-state energies of a system of interacting particles, it is important to take into account the Coulomb interaction between the particles.

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A negative answer for electric force in coulombs law  indicates that the two objects have opposite charges and are attracted to one another which is option A.

Coulomb's Law is a fundamental principle of physics that describes the electrostatic force between electrically charged particles. It states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

The equation for Coulomb's Law is given by F = k * (q1 * q2) / r^2, where F is the force between the charges, k is Coulomb's constant, q1 and q2 are the magnitudes of the charges, and r is the distance between them.

Coulomb's Law states that the magnitude of the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. The negative sign in the equation indicates that the force is attractive if the charges are opposite and repulsive if the charges are the same

Therefore, if a student gets a negative answer when solving for electric force, it means that the two objects have opposite charges and are attracted to one another.

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Answer:

Sound

Explanation:

Answer:

When an object vibrates, it creates kinetic energy that is transmitted by molecules in the medium. As the vibrating sound wave comes in contact with air particles passes its kinetic energy to nearby molecules. As these energized molecules begin to move, they energize other molecules that repeat the process.

Explanation:

So sound waves

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The Correct choice is :

because the ball comes in motion as the boy kicks the ball.

Same Question here answered by me correctly with proper explaination.

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Answer:

150 km/hr²

Explanation:

The data for the motion of the train includes;

The train starts from rest, therefore, the initial velocity of the train, u = 0 km/hr

The speed of the train after 0.5 hours, v = 75 km/hr

The change in time during the motion of the train, Δt = 0.5 hours

The acceleration, 'a', is the rate of change of velocity with time;

\(a = \dfrac{\Delta v}{\Delta t} = \dfrac{v - u}{\Delta t}\)

Therefore, we have;

a = (75 km/hr - 0 km/hr)/(0.5 hr) = 150 km/hr²

a = 150 km/hr² = 150 km/hr² × 1,000 m/km × hr²/(3,600 s)² = 5/432 m/s²

The acceleration of the train, a = 150 km/hr² = 5/432 m/s².

A. Total momentum in a closed system is conserved

the law of momentum conservation states that The total amount of momentum before the collision is the same as the total momentum after the collision. Regardless of the change of momentum of each object.

Answer:

repeat using same variables

Explanation:

have peer repeat using same variables

The Horizontal motion of a kickball involves a constant speed and zero acceleration, as there are no external forces acting on it. The position-time graph shows a straight line with a constant slope, while the velocity-time graph displays a horizontal line at the constant velocity value.

The horizontal motion of a kickball can be described using the concepts of distance, displacement, speed, and velocity. When the kickball is kicked, it follows a parabolic trajectory with its horizontal motion being constant, assuming no external forces like air resistance act upon it.

On a position-time graph, the horizontal motion can be represented as a straight line with a constant slope, indicating a constant speed. The slope of this line represents the horizontal speed of the kickball. The greater the slope, the faster the kickball's horizontal speed.

On a velocity-time graph, the horizontal velocity remains constant, as there is no acceleration in the horizontal direction. This is depicted as a straight horizontal line at the constant velocity value.

In summary, the horizontal motion of a kickball involves a constant speed and zero acceleration, as there are no external forces acting on it. The position-time graph shows a straight line with a constant slope, while the velocity-time graph displays a horizontal line at the constant velocity value.

These features on the graphs support the understanding of the kickball's horizontal motion.

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he Paritha is participating in a study in which her behaviors are studied in a natural setting. This is an example of a(n) option (a) field study.

In a field study, researchers observe and analyze participants' behaviors in their natural settings or real-life environments. The goal is to gather data in a context that closely resembles the participants' everyday lives, rather than in a controlled laboratory setting.

Paritha's participation in a study where her behaviors are observed in a natural setting indicates that she is involved in a field study. Researchers might observe Paritha's behaviors, interactions, and reactions in real-world situations to gain insights into her natural behavior patterns and better understand how certain factors or variables influence her behavior in her typical environment.

An analog study (option b) involves creating a simulated or artificial environment to observe participant behavior. Between subjects design (option c) refers to a study design where different groups of participants are assigned to different conditions.

Longitudinal study (option d) involves following a group of participants over an extended period to examine changes or development over time. Neither of these options accurately describes Paritha's study as described.The correct answer is option a.

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Answer:

I believe it's A (450 N)

Explanation:

Since both you and your dad are pushing in the same direction, you must add the force N to get the net force, which in this case in 450 N

Answer:

Full and New Moon

Explanation:

The compression of the spring when the mass is placed on it and doesn't move is \(\frac{{M \cdot g}}{{k}}\). The maximum compression when the mass is released is \(\frac{{2 \cdot M \cdot g}}{{k}}\). The speed of the mass when it reaches a height of 2L is sqrt(4 * g * L).

Assumptions: neglecting air resistance, ideal linear spring, one-dimensional motion.

(a) To determine the compression of the spring when the mass is placed on it and doesn't move, we can equate the gravitational force acting on the mass (M * g) to the force exerted by the spring (k * s), where s is the compression of the spring. Therefore, we have:

M * g = k * s

Rearranging the equation to solve for s:

\(s = \frac{{M \cdot g}}{{k}}\)

The correct answer for the compression of the spring is indeed \(s = \frac{{M \cdot g}}{{k}}\).

(b) When the mass is released from being barely touching the top of the spring, it will experience a maximum compression. This maximum compression occurs when all the potential energy of the mass is converted into elastic potential energy of the spring. Therefore, we can equate the potential energy of the mass (M * g * s) to the elastic potential energy of the spring (0.5 * k * s²), where s is the maximum compression of the spring. Solving this equation:

M * g * s = 0.5 * k * s²

Simplifying and solving for s:

\(s = \frac{{2 \cdot M \cdot g}}{{k}}\)

The correct answer for the maximum compression of the spring is \(s = \frac{{2 \cdot M \cdot g}}{{k}}\).

(c) To find the speed of the mass when it reaches a height of 2L above the table, we can apply the principle of conservation of mechanical energy. The initial mechanical energy of the system is the sum of the potential energy (M * g * s) and the elastic potential energy of the compressed spring (0.5 * k * s²). When the mass reaches a height of 2L, all the initial potential energy is converted into kinetic energy (0.5 * M * v²), where v is the speed of the mass.

M * g * s + 0.5 * k * s² = 0.5 * M * v²

Substituting the expression for s from part (c):

\((M \cdot g \cdot \frac{{2 \cdot M \cdot g}}{{k}}) + 0.5 \cdot k \cdot \left(\frac{{2 \cdot M \cdot g}}{{k}}\right)^2 = 0.5 \cdot M \cdot v^2\)

Simplifying and solving for v:

|v| = sqrt(4 * g * L)

The correct answer for the speed of the mass when it reaches a height of 2L above the table is |v| = sqrt(4 * g * L).

Approximations and simplifying assumptions made in this problem may include:

- Assuming negligible effects of air resistance or friction.

- Assuming an ideal spring with linear behavior (Hooke's Law) throughout its range of compression.

- Treating the spring as massless and neglecting its own gravitational potential energy.

- Assuming a one-dimensional motion without any lateral or rotational effects.

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Answer:

2m/s^2

Explanation:

Clculate the acceleration:

V = u +at

20m/s = 0 + a*10s

a = 20m//10s

a = 2m/s²

From the data given , it is not possible to calculate the displacement , because no direction of motion is given

But it is possible to calculate the distance travelled

Distance = ut + ½ *a*t²

distance = 0 + ½ * 2m/s * 10²s

distance = 100m

This is an example of potential cause and effect. The potential cause is the improper use of tools, specifically using a regular wrench instead of a torque wrench to tighten the spark plug. The potential effect is the malfunctioning of the spark plug, leading to its failure to work properly.

Using the wrong tool, in this case, a regular wrench instead of a torque wrench, can lead to overtightening or undertightening of the spark plug. A torque wrench is specifically designed to apply a specific amount of torque or rotational force to tighten the spark plug to the manufacturer's specifications. Without using a torque wrench, it becomes challenging to achieve the correct tightness, which can result in a range of issues.

In the given scenario, the potential failure mode is the spark plug not functioning correctly, leading to the bike's engine not igniting properly. This can result in poor engine performance, misfires, or complete engine failure. Using the appropriate tools and following proper procedures is crucial to ensure the reliable and safe operation of mechanical components.

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The pressure at the bottom of both beakers is the same. The correct answer is D.

The pressure at the bottom of both beakers is the same. The pressure at the bottom of a fluid is determined by the weight of the fluid above it, which is the same for both beakers since they are equally filled with the same amount of liquid. The air pressure on the beakers does not affect the pressure inside the liquid.

The weight of both liquids cannot be the same, as the density of the liquid in beaker B is greater than that of water, so it will have a greater weight. The area at the bottom of the beakers may be the same or different, but it is not relevant to the pressure at the bottom. Therefore, the correct statement is D, that the pressure at the bottom of both beakers is the same.

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--The complete question is, Two identical beakers are both equally filled with a liquid. Beaker A contains water. Beaker B contains a liquid that is denser than water. Which statement is true?
A. The air pressure on the beaker containing dense liquid is greater.
B. The weight of both liquids is the same.
C. The area at the bottom of both beakers is the same.
D. The pressure at the bottom of both beakers is the same.--

The ideas that describe the Big Crunch are After the universe reaches its expansion limit, gravity will pull it all back together.

The Big Crunch is a hypothetical scenario in cosmology where the universe, after a period of expansion, eventually stops expanding and starts contracting under the influence of gravity. In this scenario, gravity eventually overcomes the expansion, causing all matter and energy in the universe to collapse back into a hot and dense state. This concept suggests that the universe is cyclic, with periods of expansion (Big Bang) followed by contraction (Big Crunch) and potentially leading to a new cycle.The idea that the Big Bang never occurred (option 2) and that the universe must have a different origin is not related to the concept of the Big Crunch.

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The size of the electric current is 155 Amperes.

Calculation:

I = Q / t

I = 93.0 C / 0.601 s

I = 155 C/s

I = 155 A

Electric current is the flow of charged particles such as electrons and ions, that travel through a conductor or space. It is measured as the net flux of charge to the surface or control volume. Electricity starts with atoms.

Atoms are made up of protons neutrons and electrons. Electricity is generated when electrons are moved from atom to atom by an external force. The flow of electrons is called current. Current refers to the flow of current in an electronic circuit and the amount of current that flows through the circuit.

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Answer:

GPE = Mgh = 132J

Explanation:

Mgh

4.5×9.8×3

132J

Answer:

The new charge is +2

Explanation:

Sodium atom has 11 electrons (2, 8, 1)

sodium ion is cation and it will have 10 electrons after losing 1 electron (Na⁺), the charge is +1 because it needs to lose 1 electron to attain octet structure and become stable.

When this sodium ion loses 1 more electron, the new charge will be Na²⁺.

Thus, the new charge will be  +2

Answer:

mass= 20kg

g=10m/s2

weight is F=mg

F=20×10

F=200N

Answer:

yes that is correct

Explanation: