2. A train travels with a constant speed of 56 miles per hour. How far can it travel in 1/2 hour? ​

Answer:

896 kj

Explanation:

KE= 1/2 mv^2 = 1/2  1120  40^2 =  

The other way to name pm−→−pm→ is "vector pm." A vector is a mathematical object that has both magnitude (size) and direction. Vectors are denoted with an arrow over a letter (e.g., pm →).

Vectors can be added together, and they can be multiplied by scalars (numbers). They are used in a variety of fields, including physics, engineering, and computer science.

Vectors can be described using different notations. For example, pm−→−pm→ can also be written as vector pm.

Similarly, pw−→−pw→ can be written as vector pw, mp−→−mp→ can be written as vector mp, and pt−→−pt→ can be written as vector pt

Another way to name pm−→−pm→ is "vector pm." This is a common notation used to describe vectors in mathematics and physics. Similarly, pw−→−pw→ can be written as vector pw, mp−→−mp→ can be written as vector mp, and pt−→−pt→ can be written as vector pt.

Vectors are an important concept in mathematics and physics. They are used to describe physical quantities that have both magnitude (size) and direction.

Vectors can be described using different notations. One common notation is to use an arrow over a letter to indicate that it represents a vector.

For example, pm−→−pm→ can be written as vector pm. Similarly, pw−→−pw→ can be written as vector pw, mp−→−mp→ can be written as vector mp, and pt−→−pt→ can be written as vector pt.

Using vector notation can help to simplify calculations and make them easier to understand. For example, when working with forces in physics, it is often easier to work with vectors than with scalars.

Vectors can be added together to find the resultant force, and their direction can be used to determine the direction of the force.

Overall, vectors are an important concept in mathematics and physics. They are used to describe physical quantities that have both magnitude and direction.

Vectors can be described using different notations, including arrow notation. This notation can help to simplify calculations and make them easier to understand.

Vectors are an important concept in mathematics and physics that can be described using different notations. One common notation is to use an arrow over a letter to indicate that it represents a vector. For example, pm−→−pm→ can be written as vector pm. Similarly, pw−→−pw→ can be written as vector pw, mp−→−mp→ can be written as vector mp, and pt−→−pt→ can be written as vector pt. Using vector notation can help to simplify calculations and make them easier to understand.

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The minimum work needed to push a 1000 kg car 300 m up a 17.5-degree incline

Given by the following steps;

Step-We calculate the gravitational potential energy (GPE) of the car as it's lifted up the incline. This will be equal to the minimum work required to push the car up the incline. The GPE is given by;GPE = mgh. Where m = mass of the car = 1000 kg; g = acceleration due to gravity = 9.81 m/s²; h = height gained = 300 sin(17.5°) = 84.4 mGPE = mgh = 1000 × 9.81 × 84.4 = 829,944 J

Step 2If we consider friction, we can calculate the minimum work required as follows:Total work done = work done against gravity + work done against frictionW = GPE + work done against friction

Where the work done against friction is given by; Wf = friction force × distance × cos(θ)Here θ = angle of incline = 17.5° and the friction force is given by the product of the effective coefficient of friction (µ) and the normal force. The normal force is equal to the component of the weight of the car that acts perpendicular to the incline.Nf = mg cos(θ)Wf = µNf × distance × cos(θ) = µmg cos²(θ) × distance × cos(θ) = µmgdcos²(θ)W = mgh + µmgdcos²(θ)Substituting m, g, h, d, and µ into the equation gives;W = 1000 × 9.81 × 84.4 + 0.25 × 1000 × 9.81 × 300 × cos²(17.5)W = 1,454,392 J

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Given details :

1.Force equilibrium in x direction

∑ \(F{x}\) = 0

F - 39 cos Ф = 0

As Ф = 38°

F = 39 cos38°

F = 30.73 N

Force equilibrium in y direction

∑ \(F{y}\) = 0

N = W + P sin38°

   =  70 + 39 sin38°

N = 93.79 N

Thus the normal force on chair = 93.79 N

From the free body diagram

F = μN

30.73 = μ x 93.79

μ = 30.73 / 93.79 = 0.32

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Answer:

An electron added to a noble gas must go in the next higher energy level. The periodic trend for electron affinity values is not as consistent as for other trends.

Answer:

v = 3.57 m / s

Explanation:

Let's use Newton's second law in the upper part of the circle, with the minimum speed so that the water does not rest on the circle, that is, the normal is zero

          W = m a

acceleration is centripetal

          a = v² / r

let's substitute

         mg = m v² / r

         v = \(\sqrt{r g }\)

let's calculate

        v = \(\sqrt{1.3 \ 9.8}\)ra 1.3 9.8

        v = 3.57 m / s

The time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

To find out how long it would take to cover the Moon to a depth of 1.20 meters with micrometeorites, we can calculate the volume of the Moon and then divide it by the volume of one micrometeorite. Let's break down the calculation step by step:

Calculate the volume of the Moon:

The average radius of the Moon is approximately 1.737 ×10⁶ meters. Using the formula for the volume of a sphere, V = (4÷3)πr³, we can calculate the volume of the Moon.

\(V_{moon}\) = (4÷3)π(1.737 × 10⁶)³

Calculate the volume of one micrometeorite:

The diameter of the micrometeorite is given as 1.30 ×10⁽⁻⁶⁾ meters, which means the radius is half of that.

\(r_{meteorite}\) = (1.30 × 10⁽⁻⁶⁾)÷2

Using the formula for the volume of a sphere, V = (4÷3)πr₃, we can calculate the volume of one micrometeorite.

\(V_{meteorite}\) = (4÷3)π((1.30 × 10⁽⁻⁶⁾)÷2)³

Calculate the number of micrometeorites needed to fill the Moon:

To find the number of micrometeorites required to fill the Moon, we divide the volume of the Moon by the volume of one micrometeorite.

\(N_{meteorites}\) = \(V_{moon}\) ÷ \(V_{meteorite}\)

Calculate the time to fill the Moon:

Since one micrometeorite strikes each square meter of the Moon each second, we can equate the number of micrometeorites needed to fill the Moon to the number of seconds it would take.

Time = \(N_{meteorites}\) ÷ (1 m²/s)

Convert seconds to years:

Finally, we convert the time in seconds to years by dividing by the number of seconds in a year (assuming 365.25 days in a year and 24 hours in a day).

\(Time_{years}\) = Time ÷ (365.25 days/year × 24 hours/day × 3600 seconds/hour)

Performing these calculations will give us the time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

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Explanation:

weight of the piano = mg

w = 99 x 10 =990 N

The number of the grains of salt that would be in the total mass of the sand is determined as  1.67 x 10⁶ gains.

The number of grains of salt is calculated by dividing the total mass of the sand by the mass of a single grain of salt.

Mathematically, the formula for the number of grains of salt is given as ;

1 grain of salt ----------> 0.06 mg

? grain of salt ------------> 100 g

For the mass of a grain of salt is around 0.06 mg, the number of grains that will be found in 100 grams of sand is calculated as follows;

number of grains of salt = ( mass of the sand ) / ( mass of a single grain of salt )

number of grains of salt = ( 100 g ) / ( 0.06 x 10⁻³ g )

number of grains of salt = 1.67 x 10⁶ gains

Thus, the number of the grains of salt found in the mass of the sand is a function of total mass of the sand and the mass of a single grain of salt.

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The indestructible bullet, 2.00 cm long, will penetrate straight through the 10 cm thick board with its initial speed.

When an indestructible bullet is fired straight through a board, its length and the thickness of the board are relevant factors in determining whether the bullet will pass through or get lodged inside. In this case, the bullet is 2.00 cm long, while the board is 10 cm thick.

Since the bullet is described as indestructible, it implies that the bullet will not deform or break upon impact with the board. As a result, the bullet will continue moving through the board, provided its length is smaller than the thickness of the board.

With the given information, we can conclude that the indestructible bullet, being 2.00 cm long, will penetrate straight through the 10 cm thick board. The initial speed of the bullet does not affect this outcome, as long as it meets the condition of being smaller in length than the board's thickness.

It is important to note that this explanation assumes ideal conditions, where the bullet and board are perfectly aligned, and there are no external factors affecting the motion of the bullet. In practical scenarios, various factors such as angle, velocity, and material properties can influence the bullet's behavior upon impact.

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The coefficient of friction on the left surface is 0.30, and on the right surface 0.16. The acceleration of the system is 9.91 m/s².

The acceleration of the system on a double-incline plane, given the coefficient of friction on the left surface (0.30) and the right surface (0.16). To solve for the acceleration, you can use the formula:

a = g(sinθ - μcosθ)

where a is the acceleration, g is the acceleration due to gravity (9.8 m/s²), θ is the angle of inclination, and μ is the coefficient of friction.

Using this formula, you can first find the angle of inclination for each surface by taking the inverse sine of the ratio of the height to the length of the incline:

θL = sin⁻¹(10/20) = 30°

θR = sin⁻¹(15/20) = 53.13°

Next, you can use the formula to find the acceleration for each surface and then add them together to find the total acceleration:

aL = 9.8(sin30° - 0.30cos30°) = 2.24 m/s²

aR = 9.8(sin53.13° - 0.16cos53.13°) = 7.67 m/s²

a = aL + aR = 2.24 + 7.67 = 9.91 m/s²

Therefore, the acceleration of the system is 9.91 m/s².

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      Maybe this graph can help?

Orbiting telescopes can provide many advantages for observations in the visible and other parts of the electromagnetic spectrum, they can present challenges for radio observations.

Orbiting telescopes can be problematic for the radio portion of the electromagnetic spectrum due to several reasons:

1. Interference from Earth-based sources: Radio signals can be easily disrupted by interference from sources on Earth such as cell phone towers, television transmitters, and other radio transmitters. These sources can cause interference and noise in the radio signals received by the telescope.

2. Atmosphere: Radio signals can also be affected by the Earth's atmosphere, particularly by water vapor, which can absorb or scatter radio waves. Orbiting telescopes are above the atmosphere and can therefore avoid this issue.

3. Limited bandwidth: The bandwidth available for radio telescopes is limited, and orbiting telescopes have to share this bandwidth with ground-based telescopes. This can lead to a limited amount of data that can be transmitted to Earth.

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The area under the t-distribution with 17 degrees of freedom rounded to 4 decimal places, is 0.2908.

To calculate the area to the right of 0.57 under the t-distribution with 17 degrees of freedom, we can use a t-distribution table or a statistical calculator. Here, I'll use the t-distribution table:

Looking up the value 0.57 in the t-distribution table with 17 degrees of freedom, we find the area to the left of 0.57 is 0.7092.

Since we want the area to the right of 0.57, we subtract the area to the left from 1:

Area to the right = 1 - 0.7092 = 0.2908

Rounding this to 4 decimal places, the area to the right of 0.57 under the t-distribution with 17 degrees of freedom is approximately 0.2908.

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The correct answer is velocity.

The vector measure of level and direction of motion is known as velocity. The speed at which an object goes in one direction is known as its velocity. Speed may be used to calculate both the speed of the car traveling north on the major highway and the speed of the rocket bursting in space. As you may expect, the vector velocity's scalar size (total value) corresponds to the movement's speed. Speed is the initial exit of a place in terms of time when it comes to computations. A straightforward formula that incorporates measurement, distance, and time can be used to determine speed.

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Answer:

Mid-ocean ridges around the globe are linked by plate tectonic boundaries and the trace of the ridges across the ocean floor appears similar to the seam of a baseball.

Explanation:

Without additional information, the ultimate load of a rectangular foundation with 6 x 4 dimensions that is being subjected to an eccentric load cannot be computed.

The ultimate load capacity of the footing is influenced by a number of variables, including the material properties, the soil characteristics, and the size and placement of the eccentric load.

It would be necessary to conduct a structural study taking into account the footing's geometry, material qualities, and load circumstances in order to calculate the ultimate load. For the analysis to establish the maximum load that the footing can support, calculations for soil bearing capacity, shear strength, and bending moments are commonly used. It is significant to highlight that a competent engineer who is knowledgeable should carry out the computations.

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Answer:

1. The metal sphere can have kinetic energy if it is moving, even if it is stationary overall.

2. Temperature is a measure of the average kinetic energy of the particles in a substance.

3. Thermal energy applied to an ice cube causes its molecules to gain kinetic energy and move around more, which leads to melting.

4. An ice cube can still melt in a cold glass of water because thermal energy will transfer from the water to the ice cube until they reach thermal equilibrium.

5. A scientist studying thermal energy may work alone or as part of a team, with each member potentially performing a different role on the project.

6. The conclusion of a scientific investigation uses reasoning to explain and interpret the results of the investigation.

7. A heater in one corner of a fish aquarium can warm the whole aquarium through convection currents that transfer warmer water away from the heater and cooler water toward the heater.

8. When a cold spoon is placed in hot soup, the soup's molecules transfer thermal energy to the spoon because they have more kinetic energy.

9. Thermal insulators reduce the rate of heat transfer by limiting the conduction, convection, or radiation of thermal energy.

10. When thermal energy is applied to ice, the temperature rises until 0°C and then stays the same as the energy is used to break the ice's intermolecular bonds and turn it into liquid water.

11. The water molecules closest to the burner rise in the pot because they become less dense as they gain thermal energy, causing them to rise and be replaced by cooler, denser water.

12. Three examples of thermal energy transfer in the scenario of a baker using oven mitts to open an oven, take out a loaf of bread, and place it on a plate are: the oven heating the bread, the oven mitts transferring heat from the oven to the baker's hands, and the bread transferring heat to the plate.

Explanation:

t

this was very easy, hope it helped you :))

Answer:

How can a stationary metal sphere have kinetic energy, the energy of motion?

The metal is made of atoms, which are vibrating in place.

What do you measure when you find a substance’s temperature?

Responses

average kinetic energy of the particles in the substance

What happens when thermal energy is applied to an ice cube?

Responses

Its water molecules gain kinetic energy and move around more.

Why does an ice cube melt even in a cold glass of water?

The water is still warmer than the ice cube, so thermal energy moves from the water to the ice cube.

Which scenario best describes a scientist who is studying thermal energy?

Responses

She works on a team, with each member performing a different role on the project.

What is the best description of the conclusion of a scientific investigation?

The conclusion uses reasoning to explain and interpret the results.

How does a heater in one corner of a fish aquarium warm the whole aquarium?

The heater creates convection currents, which transfer warmer water away from the heater and cooler water toward the heater.

What happens when a cold spoon is placed in hot soup?

Responses

The soup’s molecules have more kinetic energy, so they transfer thermal energy to the spoon.

Explanation:

I know these are right.

Explanation:

the pressure is given by P=hpg

where h is height,p is density, g is 10m/s²

thus P= 0.05m•13.6x10³•10

P=6.8x10³ Hgmm

We can use the thin lens equation to relate the distance of an object to its image formed by a lens. The thin lens equation is:

\(1/f = 1/d_o + 1/d_i\)

where:

f is the focal length of the lens

d_o is the distance from the object to the lens

d_i is the distance from the lens to the image

Let's assume that the height of the mountain is h, and the height of the image on the camera sensor is h'. Then, the ratio of the height of the mountain's image on the camera's image sensor for the second picture to its height on the image sensor for the first picture is:

\(h'_2/h'_1\)

We can use similar triangles to relate the object and image distances to the heights of the object and its image. The ratio of the heights is equal to the ratio of the image distance to the object distance:

\(h'/h = d_i/d_o\)

For the first picture, the object distance is d_o = 12 km = 12000 m, and the image distance can be found using the thin lens equation:

\(1/f = 1/d_o + 1/d_i\)

Solving for d_i, we get:

\(1/d_i = 1/f - 1/d_o\)

\(d_i = 1 / (1/0.050 - 1/12000)\)

\(d_i = 0.05 m\)

The ratio of the heights for the first picture is:

\(h'_1/h = d_i/d_o = 0.05m / 12000 m\)

\(h'_1/h = 4.16 \times 10^{-6}\)

For the second picture, the object distance is d_o = 5.8 km = 5800 m, and the image distance can be found using the thin lens equation as before:

\(1/f = 1/d_o + 1/d_i\)

\(1/d_i = 1/0.05 - 1/d_o\)

\(d_i = 0.05 m\)

The ratio of the heights for the second picture is:

\(h'_2/h = d_i/d_o = 0.05 mm / 5800 m\)

\(h'_2/h = 8.62 \times 10^{-6}\)

So the ratio of the height of the mountain's image on the camera's image sensor for the second picture to its height on the image sensor for the first picture is:

\(h'_2/h'_1 = (h'/h)_2 / (h'/h)_1\)

\(h'_2/h'_1 = (8.62 \times 10^{-6}) / (4.16 \times 10^{-6})\)

\(h'_2/h'_1 = 2.07\)

Therefore, the ratio of the height of the mountain's image on the camera's image sensor for the second picture to its height on the image sensor for the first picture is approximately 2.07.

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According to the question an electromagnetic wave in a vacuum moves at the speed of light.

An electromagnetic wave is a type of energy that is created by the vibration of an electric field and a magnetic field. Electromagnetic waves are an invisible form of energy that can travel through a vacuum and other types of matter. They can also travel through the air and other materials, such as metal and water. Electromagnetic waves are responsible for many of the phenomena we observe in our everyday lives, such as light, sound, and radio. Electromagnetic waves have a wide range of frequencies, ranging from high-energy gamma rays to low-energy radio waves. Each type of electromagnetic wave has its own unique properties, such as wavelength, frequency, and amplitude. Electromagnetic waves are also responsible for the transmission of information through cell phones, radio waves, television waves, and microwaves.

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It will take approximately 66.67 minutes for the 150 W heating element to raise the temperature of 2 kg of water from 25°C to boiling temperature.

To calculate the time it takes for the water to reach boiling temperature, we need to use the formula:

Q = mcΔT

where Q is the heat energy required, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

First, we need to calculate the heat energy required to raise the temperature of the water from 25°C to 100°C (boiling temperature).

ΔT = 100°C - 25°C = 75°C

Q = mcΔT = (2 kg) x (4000 J/kg°C) x (75°C) = 600,000 J

Next, we need to calculate the time it takes for the 150 W heating element to provide this amount of heat energy.

Power = Energy / Time

Time = Energy / Power

Time = 600,000 J / 150 W = 4000 seconds or 66.67 minutes
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Answer:_COC1\/2+_H\/2O>_HC1+CO\/2

Explanation:

Need help asap

Answer:

ok  a good rest of your day

Explanation:

Answer:

conduction is the correct answer

The optical effect that is essential to the visual experience of motion pictures is known as Persistence of Vision.

Persistence of Vision (POV) is a phenomenon of the eye where an image or object is perceived by the brain for a short period of time after the image or object has been removed from the viewer's sight. The phenomenon occurs because of the retina's temporary retention of visual images even after they have been seen.

The Persistence of Vision enables the human eye to perceive the illusion of motion when viewing a series of still images in rapid succession. This effect is the foundation for the creation of motion pictures. In films, a sequence of still images is displayed in rapid succession (typically at a rate of 24 frames per second) that simulates motion to the human eye, tricking it into believing that the images are moving in a fluid and natural way.

POV is an essential aspect of the visual experience of motion pictures as it allows filmmakers to create an illusion of motion using a series of still images. The human eye is capable of retaining images for a short period of time after they have disappeared from the field of vision, which makes this effect possible.

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In atrial flutter, atrial contraction occurs at such a rapid rate that discrete P waves separated by a flat baseline cannot be seen.