Sonar question: A person's yells into a deep well, sending a sound wave that travels at a speed of 50 m/s. The echo is heard in 6 seconds.
How deep is the well? Remember, speed distance/time

1) Gravity is a force of attraction acting between bodies or objects that have masses. It pulls the bodies towards each other.

Romanesque painting style was prominent from the 10th to the 12th century in Europe. It was a part of the overall Romanesque art movement that occurred during this period.

The following are the best descriptions of the Romanesque painting style:

The Romanesque painting style emphasized three-dimensionality and lifelike representation.

The Romanesque painting style is a stylized and decorative style that was used to depict biblical themes, and images were stylized and decorative.

The Romanesque painting style includes decorative and ornamental elements, with gold leaf and bright colors used to create illuminated and decorative manuscripts.

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The velocity of Johnny is 10km/hr

The rate at which an object's position changes in relation to a frame of reference and time is the term meant by velocity. Although it may appear sophisticated, velocity is just the act of moving quickly in one direction. Since it is a vector quantity, the definition of velocity requires both magnitude (speed) and direction. Its SI equivalent is (ms-1). A body is considered to be accelerating if the magnitude or direction of its velocity changes.

We are given that,

The distance of the school = d = 5km

The time taken to reach school = t = 30min = 0.5hr

Velocity of Johnny = V = ?

V = d/t

V = (5km)/ (0.5hr)

V = 10km/hr

Therefore , the velocity would be 10km/hr

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The force responsible for the acceleration of the crate is the frictional force between the crate and the bed of the truck.

When the truck accelerates, the crate tends to remain at rest due to inertia. However, the frictional force between the crate and the bed of the truck acts in the forward direction, allowing the crate to accelerate along with the truck.

This frictional force is a result of the interaction between the surfaces of the crate and the truck bed. Without this frictional force, the crate would slide or move independently from the truck's acceleration.

The frictional force arises due to the microscopically rough surfaces of the crate and the truck bed. As the two surfaces are pressed against each other, intermolecular forces come into play, resulting in the generation of the frictional force

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The quantities that are usually conserved for a comet orbiting the sun are:
Speed: The speed of a comet remains constant unless it is acted on by an outside force.
Total Mechanical Energy: The sum of the kinetic and potential energies of a comet remain constant in a closed system.
Kinetic Energy: The energy of a comet due to its motion.
Angular Momentum with Respect to the Center of the Ellipse: The angular momentum of a comet with respect to the center of its orbit remains constant.
Acceleration: The acceleration of a comet is zero unless acted upon by a force.
Gravitational Potential Energy: The potential energy of a comet due to its gravitational attraction to the sun remains constant.
Angular Speed: The angular speed of a comet remains constant unless it is acted upon by a force.
Linear Momentum: The momentum of a comet is conserved, meaning that its momentum remains the same unless acted upon by a force.
Angular Momentum with Respect to the Sun: The angular momentum of a comet with respect to the sun remains constant.

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Now chose the option below that best completes this sentence: An ammeter is always connected in series because it has very low resistance.

For current, flow rate is inversely proportional to resistance and directly proportional to potential difference. Other flows include permeation, surface diffusion, and the diffusion of one gas through another. a System of Charges' Electric Potential Energy The amount of work required to form a system of charges by bringing them to their specific positions from infinity against the electrostatic force without any acceleration is equal to the system's electric potential energy. U is used to indicate it. The electric force per unit charge acting on a test particle at a specific location in space is represented by the electric field, which is a vector quantity. The electric field is a vector quantity because force is a vector.

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Answer:

Molar mass of CrF3, Chromium(III) Fluoride is 108.9913096 g/mol

51.9961+18.9984032·3

Mass percentage of the elements in the composition

Element Symbol Atomic Mass Number of Atoms Mass Percent

Chromium Cr 51.9961 1 47.707%

Fluorum F 18.9984032 3 52.294%

Notes on using the Molar Mass Calculator

Chemical formulas are case-sensitive.

Enter subscripts as simple numbers.

The converter uses a simple dot instead of using a midpoint typographic dot (·) in formulas for adduct molecules, such as water of hydration.

Example: type CuSO4.5H2O instead of CuSO₄·5H₂O.

Explanation:

please mark my answer in brainlist plz

The minimum thickness of the oil slick that appears blue when illuminated with white light is 156.9 nm.

When a thin film of oil is illuminated with white light, some of the light reflects from the top surface of the film and some reflects from the bottom surface of the film.

If the thickness of the film is an integer multiple of half the wavelength of the light, the two reflected waves interfere constructively and the film appears bright at that particular wavelength. This is known as thin-film interference.

The condition for constructive interference for a thin film of thickness t, index of refraction n, and illuminated with light of wavelength λ is:

2nt = mλ

where m is an integer (0, 1, 2, 3, ...).

In this problem, we have:

λ = 455 nm = \(455 × 10^-9 m\)

n = 1.45

To find the minimum thickness of the oil slick that appears blue when illuminated with white light, we need to find the smallest integer m for which the above equation is satisfied.

For m = 1, we have:

2nt = λ

t = λ / (2n) = (\(455 × 10^-9\)m) / (2 × 1.45) = 156.9 nm

Therefore, the minimum thickness of the oil slick that appears blue when illuminated with white light is 156.9 nm.

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The control in the experiment is option B. The group that is given no shock.

The method utilized by the researcher in scientific study to reduce the impact of unimportant factors is known as experimental control. The power of the independent variable to alter the dependent variable is further strengthened by experimental control. 9 Nov 2021

A controlled experiment is a scientific test carried out under predetermined circumstances in which only one (or a small number of) variables are altered at a time while all other variables are maintained constant.

Researchers use experimental controls to reduce the impact of unrelated experience and environmental factors, as well as to strengthen the conclusion that changes in the dependent variable are caused by the independent variable (the ability to infer causality).

Hence, option B is correct as it is not receiving any special treatment in the experiment.

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Answer:

it becomes a gas

Explanation:

the matter expands, turning into steam, a gas.

Answer:

1.4L

Explanation:

You basically divide 20 divided by 1.5

Answer:

newton's 2nd  law

Explanation:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Answer:

4 m/s south

Explanation:

This is a pretty easy one.

Assume that the car has a reference point ragged x

We also know that the car starts moving at a point 10 m North of X. It moves steadily at a uniform velocity and ended at a position 10 m south of X.

If x is the reference point, we can infer that the car moves a total distance of, 10 m + 10 m.

Thus, the total distance moved by the car is 20 m.

It is also stated that it achieves that distance in 5 seconds.

Velocity is defined as the ratio of distance with respect to the tome taken, i.e V = d/t

Then, the velocity is

V = 20 / 5 = 4 m/s

Considering the fact that the car left and moved towards the south. We can say that it moved 4 m/s South.

Speed of the bricks at the top of hill is 6.26 m/s. c.)speed of the bricks at the top of hill is 14.14 m/s. d)minimum compression of spring necessary to get to the top of hill is 6.26 m. e) speed of the bricks at the top of hill with 2 m of initial compression and 15% energy dissipation is 13.04 m/s.

The capacity or power to do work, such as the capacity to move an object by application of force is called energy.

Initial potential energy of compressed spring is:

Ep = 1/2 kx^2 = 1/2 * 500 N/m * (2 m)^2 = 1000 J

k is spring constant, x is compression of the spring, and J is unit of energy in joules.

Final potential energy of the bricks is:

Ep = mgh = 100 N * 9.81 m/s^2 * 2 m = 1962 J

Ep = Ep

1/2 kx^2 = mgh

v = sqrt(2gh) = sqrt(2 * 9.81 m/s^2 * 2 m) = 6.26 m/s

Therefore, the speed of the bricks at the top of the hill is 6.26 m/s.

c.  Initial potential energy of compressed spring is: 1000 J

Ek = Ep = 1000 J

Kinetic energy of the bricks is given by:

Ek = 1/2 mv^2

1000 J = 1/2 * 100 N * v^2

v = sqrt(200 / 1) = 14.14 m/s

Therefore, the speed of the bricks at the top of the hill is 14.14 m/s.

d.  As, Ep = m g h

where m is mass of the bricks, g is acceleration due to gravity, and h is  height of the hill.

Ep = 100 N * 9.81 m/s^2 * 2 m = 1962 J

Ep = 1/2 kx^2 = 1962 J

1/2 * 500 N/m * x^2 = 1962 J

x = sqrt(2 * 1962 J / 500 N/m) = 6.26 m

Therefore, the minimum compression of the spring necessary to get to the top of the hill is 6.26 m.

e. If 15% of the energy is dissipated through friction, final kinetic energy of the bricks at the top of the hill will be 85% of initial potential energy of the compressed spring. Therefore,

0.85 * 1000 J = 1/2 mv^2

v = sqrt(170 / 1) = 13.04 m/s

Therefore, the speed of the bricks at the top of the hill with 2 m of initial compression and 15% energy dissipation is 13.04 m/s.

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The medium for an ocean wave is the ocean water which involves movement on the water body.

This is defined as a substance or material that carries the wave. In the case of ocean waves, the medium is referred to the ocean water.

The medium is not transferred when a water wave moves on a lake as energy is transported but the water molecules aren't which is why lakes have water present in them.

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Answer:

Explanation:

Momentum = m * v  = .12 * 150 = 18 kg m/s

The average velocity of the puck during the 5.90 s interval can be calculated as the average of the initial velocity and the final velocity:

Thus the velocity will be,

v_avg = (v_initial + v_final) / 2

= (12.8 + 7.5) / 2

= 10.15 m/s

The distance traveled by the puck during this interval can be calculated as:

d = v_avg * t = 10.15 * 5.90 = 59.87 m

This is the distance traveled by the puck in a straight line assuming that it does not experience any forces other than gravity.

However, since the acceleration of gravity is 9.81 m/s^2,

the puck will experience a downward acceleration due to gravity, causing its path to be a parabolic arc.

The exact distance traveled by the puck will depend on the exact path it takes, which is beyond the scope of the information provided.

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Answer:

20mlvs I'd pick for this

In a case wheeby 0.20- FF capacitor is desired the area that the  plates must  have if they are to be separated by a 3.8- mmmm air gap is \(7.23*10^7 m^2\)

A two-terminal electrical device known as a capacitor is capable of storing energy in the form of an electric charge. It is made up of two electrical wires that are spaced apart by a certain amount.

The equation for the Capacitor   can be written as ;

\(C= \frac{ ( e0x A) }{d}\)

d = 3.2-mm

\(d= 3.2 ^{-3} m\)

\(A = C *dE0\)

\(A= \frac{0.20 F * 3.2 ^-3 m}{8.85 * 10^-12 [F/m]}\)

\(A=7.23*10^7 m^2\)

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Answer:

(a) The train took 100 seconds (1.667 minutes) to reach its top speed.

(b) The train travelled a distance of 270000 meters (270 kilometers) at top speed.

(c) The train decelerates at a rate of 2.5 meters per square second.

Explanation:

Statement is incomplete. Complete description is presented below:

A train started from a station and accelerated at \(0.5\,\frac{m}{s^{2}}\) to reach its top speed of \(50\,\frac{m}{s}\) and maintained this speed for 90 minutes.

When the train approached the next station the driver applied the brakes uniformly to bring the train to a stop in a distance of 500 meters.

(a) Calculate how long it took the train to reach its top speed.

(b) Calculate how far it travelled at its top speed.

(c) Calculate the acceleration experienced by the train when the brakes were applied.

(a) Let suppose that train accelerates uniformly. Then, the time needed by the vehicle (\(t\)), measured in seconds, is described by the following equation of motion:

\(t = \frac{v-v_{o}}{a}\) (1)

Where:

\(a\) - Acceleration, measured in meters per square second.

\(v_{o}\), \(v\) - Initial and final speed, measured in meters per second.

If we know that \(a = 0.5\,\frac{m}{s^{2}}\), \(v_{o} = 0\,\frac{m}{s}\) and \(v = 50\,\frac{m}{s}\), then the time needed by the train is:

\(t = \frac{50\,\frac{m}{s}-0\,\frac{m}{s}}{0.5\,\frac{m}{s^{2}} }\)

\(t = 100\,s\)

The train took 100 seconds (1.667 minutes) to reach its top speed.

(b) Let suppose that train travels at constant speed, the distance travelled by the train (\(s\)), measured in meters, is:

\(s = v\cdot t\) (2)

Where:

\(v\) - Top speed, measured in meters per second.

\(t\) - Time, measured in seconds.

If we know that \(v = 50\,\frac{m}{s}\) and \(t = 5400\,s\), then the distance travelled by the train at top speed is:

\(s = \left(50\,\frac{m}{s} \right)\cdot (5400\,s)\)

\(s = 270000\,m\)

The train travelled a distance of 270000 meters (270 kilometers) at top speed.

(c) Let suppose that train decelerates at constant rate. We can calculate the acceleration from the following expression:

\(a = \frac{v^{2}-v_{o}^{2}}{2\cdot s}\) (3)

Where:

\(v_{o}\), \(v\) - Initial and final speed, measured in meters per second.

\(s\) - Travelled distance, measured in meters.

If we know that \(v_{o} = 50\,\frac{m}{s}\), \(v = 0\,\frac{m}{s}\) and \(s = 500\,m\), then the acceleration of the train is:

\(a = \frac{\left(0\,\frac{m}{s} \right)^{2}-\left(50\,\frac{m}{s} \right)^{2}}{2\cdot (500\,m)}\)

\(a = -2.5\,\frac{m}{s^{2}}\)

The train decelerates at a rate of 2.5 meters per square second.

A. The graph provided is a Displacement-Time Graph. The x-axis provides the displacement made by the object and the y-axis gives the time taken by the object to travel.

The amplitude of an object is defined as the maximum displacement made by the object. From the graph provided, the maximum displacement made by the object is 2cm.

Hence, as per the definition of Amplitude, the Amplitude of the object is 2cm.

The Amplitude of the object depends on the displacement made by the object. The maximum displacement is made when the object moves to an extreme position in an oscillation.

B. The object in a Simple Harmonic Motion moves from mean position to extreme positions. As the object moves from mean position to extreme position and reaches back to mean position, one oscillation or one cycle is said to be completed.

The graph represents the positive displacement when it moves to extreme position and the negative displacement as it returns from the extreme position.

The graph provided shows that for a complete one cycle or oscillation, the time taken is 4seconds.

Hence, as per the definition of Time period, the time period is 4 seconds. Therefore, the time period as ω = 2\(\pi\)/T.

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Answer:

I'm fairly certain it's 1,800

Explanation:

The efficiency of the wedge with force F=900 N displaces the wedge 0.10 m is 55.55%  or 56%.

The efficiency of the machine equals the ratio of output energy and input energy. It is also defined as the ratio of work done on a load by the machine to the work done on the effort by the machine.

A load is defined as the weight lifted by the machine. The effort is defined as the force applied to bring the desired change in the load. Work done is defined as the product of force and displacement.

The efficiency, η = Output power / Input power, and the highest efficiency of the machine is equal to one. The efficiency of the machine has no unit. The efficiency η = (Actual work done / Ideal work done) × 100.

From the given,

Force = 900 N

Displacement = 0.1 m

Work done = F × s = 900×0.1 = 90 J

Actual work done = 50 J

Efficiency,η = (50/90) × 100

           η  = 55.55 %

Thus, the efficiency of the wedge is 55.56%.

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Answer:

B- He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.

Explanation: Dissolving Salt in water is a Chemical Change, Because the Salt arrangement is different in solid state than dissolved in water. As we can see in the image below, once the Salt is dissolved, it is separated into its ions, Na+ and Cl- Now, The evaporation process is a physical change, because the water doesn´t change its configuration H20 and it only changes its form, as we can see in the image below.

Answer:

B) He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.

Explanation:

hope this helps!! :)

The velocity of the boat relative to the water can be found using trigonometry. The vector representation of the velocity of boat is

9.86 i + 6.38 j miles per hour where i and j are the unit vectors in the horizontal and vertical directions, respectively.

The speed of the boat relative to the water is given as 15 miles per hour, and the angle of 25 degrees is the angle between the boat's velocity and the direction of the river's flow.

The horizontal component of the boat's velocity relative to the water is:

15 ×cos(25) = 13.86 miles per hour

The vertical component of the boat's velocity relative to the water is:

15 × sin(25) = 6.38 miles per hour

The velocity of the river can be considered as a vector with a magnitude of 4 miles per hour and a direction opposite to the boat's motion.

The vector representing the boat's velocity relative to the ground is the vector sum of the boat's velocity relative to the water and the velocity of the river.

The horizontal component of the boat's velocity relative to the ground is:

13.86 - 4 = 9.86 miles per hour

The vertical component of the boat's velocity relative to the ground is:

6.38 + 0 = 6.38 miles per hour

Thus, the vector representing the boat's velocity relative to the ground can be expressed as:

9.86 i + 6.38 j miles per hour

where i and j are the unit vectors in the horizontal and vertical directions, respectively.

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Answer:

The closer a planet is to the sun, the shorter its period of revolution. The farther away a planet is from the sun, the longer its period of revolution.

Explanation:

i hope that helps, have a great day.

Answer:

The closer a planet is to the sun, the shorter its period of revolution. The farther away a planet is from the sun, the longer its period of revolution. so it depends on how close and how far it is to have a different time period. so if the if it is close then the period of revolution will be shorter because they need more space to have a longer period. if it is spaced out then it will have a longer period because they do have space.

Explanation:

Answer:

the answer is dry region climate

Explanation:

I hope it will help you

Answer:

the answer is dry region climate

Explanation:

hope it helps

An object's momentum is a measure of its motion, defined as the product of its mass and its velocity. This means that an object with a large mass moving at a high velocity will have greater momentum than an object with a smaller mass moving at a slower velocity.

The momentum of an object is a vector quantity, which means it has both magnitude and direction. The direction of an object's momentum is the same as the direction of its velocity. This means that if an object is moving north, its momentum is also northward. Momentum is an important concept in physics, particularly in the study of collisions and interactions between objects.

In these situations, the total momentum of a system is conserved, meaning that the sum of the momenta of all objects involved remains constant before and after the interaction. This principle is known as the law of conservation of momentum and is crucial for understanding the behavior of objects in motion.

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