why can't cars be constructed that can magnetically levitate in earth's magnetic field? (select all that apply.)

We can solve for ρ by rearranging this equation and substituting in the given values:ρ = (p0 + 22 - p) / g(H - h1 - h2)= (101.3 + 22 - 65) / (9.81 × (15 - 7 - 4))= 1,150 kg/m³Therefore, the density of the fluid is 1,150 kg/m³.

Let the density of the fluid be ρ, and let the height of the tank be H.

Since the pressure gauge 7 m above the bottom of the tank reads 65 kPa, we have: p + ρgh1 = 65Here, p is the atmospheric pressure, g is the acceleration due to gravity, and h1 is the height of the fluid above the gauge at 7 m from the bottom of the tank.

Similarly, the pressure gauge 4 m above the bottom of the tank reads 87 kPa, so p + ρgh2 = 87Here, h2 is the height of the fluid above the gauge at 4 m from the bottom of the tank. Now, we can subtract these two equations to eliminate the pressure term: p + ρgh1 - (p + ρgh2) = 65 - 87Simplifying and rearranging,

we get:ρg(h1 - h2) = 22... equation (1)We can also use the fact that the pressure at the bottom of the tank is equal to the weight of the fluid column above it: p + ρgH = ρg(h1 + h2) + p0Here, p0 is the atmospheric pressure at the surface of the fluid, and the right-hand side of the equation represents the weight of the fluid column from the bottom of the tank to the surface.

Now, we can substitute the expressions for p and ρg(h1 - h2) from equations (1) and (2) into this equation and simplify: p + ρgH = ρg(h1 + h2) + p0p + ρg(H - h1 - h2) = p0 + 22

Since the fluid is incompressible, we can assume that its density is constant throughout the tank. Therefore, we can solve for ρ by rearranging this equation and substituting in the given values:ρ = (p0 + 22 - p) / g(H - h1 - h2)= (101.3 + 22 - 65) / (9.81 × (15 - 7 - 4))= 1,150 kg/m³

Therefore, the density of the fluid is 1,150 kg/m³.

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Answer: False.Machine efficiency is a measure of how much work is produced by a machine compared to how much energy is required to operate the machine.

The ratio of useful output work divided by the total input work is known as machine efficiency. This number is frequently expressed as a percentage (100 x work output / work input).Example:

For example, if you lift a 50-pound weight 10 feet in the air using a pulley, the work done is 500 foot-pounds. However, if it took 600 foot-pounds of energy to lift the weight, the pulley system's efficiency would be calculated as follows: 500/600 = 0.83 or 83 percent.

The efficiency of a machine is always less than one, in general. It is defined as the ratio of output energy to input energy. Because of losses due to friction and other variables, the output energy is always less than the input energy. As a result, the efficiency of a machine is always less than one.Answer: False.

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The statement describes the way in which energy moves between a system of reacting substances  is  Molecular collisions transfer thermal energy between the system and its surroundings. Option D

In a chemical reaction, energy is either released or absorbed. This energy is transferred through molecular collisions. In other words, When molecules collide, they exchange energy.

If the reaction is exothermic, meanng it releases heat, the thermal energy is transferred from the system to the surroundings.

If the reaction is endothermic, what this means is that it absorbs heat, thermal energy is transferred from the surroundings to the system.

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Answer:

a) Q = 12600000 [J]

b) t = 4200 [s] or 70 [min]

Explanation:

To solve this problem we must use the following equation that is defined as the heat equation, this equation relates the mass to the specific heat and temperature changes.

Q = m*Cp*(T_f - T_i)

where:

Q = energy as heat [J] (units of Joules)

Cp = specific heat = 4200 [J/Kg * °C]

T_f = final temperature = 60 [°C]

T_i = initial temperature = 10 [°C]

m = mass = 60 [kg]

Q = 60*4200*(60 - 10)

Q = 12600000 [J]

b)

To calculate the time, we know that the power is equal to the energy generated over the given time.

P = Q/t

where:

P = power = 3000 [W]

t = time [s]

t = Q/P

t = 12600000/3000

t = 4200 [s] or 70 [min]

Answer:

Dispersion

Explanation:

dispersion

[diˈspərZHən, diˈspərSHən]

NOUN

the action or process of distributing things or people over a wide area.

"some seeds rely on birds for dispersion"

the state of being dispersed over a wide area.

"the general dispersion of Hellenistic culture"

ecology

the pattern of distribution of individuals within a habitat.

(Dispersion)

another term for diaspora.

a mixture of one substance dispersed in another medium.

physics

the separation of white light into colors, or the separation of any radiation according to wavelength.

statistics

the extent to which values of a variable differ from a fixed value such as the mean.

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The water level rise dH= 0.7 x 10⁻⁶cm.

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Answer:

t= 7.88

Explanation:

Starting with F=ma.

The only force that is going to cause an acceleration is gravity (if we use the coordinate system I described).

F = ma

mgsin65 = ma

a = gsin65

Vf = Vi + at

0 = 35 m/s + (gsin65)t

t = 35/gsin65

multiply it by 2 to get whole time

t = 70/gsin65

t = 7.88 seconds.

All of the below contribute to an increase in carbon levels except D. Photosynthesis.

Carbon is an essential component of life on earth, and its role is crucial in maintaining the balance in the atmosphere. However, increased carbon levels, mainly carbon dioxide (CO₂), pose a threat to our planet and all the living beings on it. Burning fossil fuels, deforestation, and industrial processes are the major contributors to the increased levels of CO₂ in the atmosphere. Hence, humans play a significant role in climate change. However, the process of photosynthesis can reduce the carbon levels in the atmosphere as it involves absorbing CO₂ from the air and converting it into oxygen (O₂) and glucose.

Breathing is the process where humans and animals take in oxygen and release CO₂ into the atmosphere. Although breathing increases the levels of CO₂ in the atmosphere, it is not considered a significant contributor to the increased carbon levels. Decay of vegetation contributes to the increase in carbon levels as it releases CO₂ into the atmosphere during the process. Petrol burning releases CO₂ into the atmosphere and contributes significantly to climate change. Therefore, the correct answer to this question is option D, photosynthesis

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Answer:

μ = 0.4

Explanation:

As, the object is moving at a constant speed. Therefore, the unbalanced force on it must be equal to zero. So, the frictional force on the object must be equal to the force applied to it:

F = frictional force

F = μR = μW = μmg

where,

F = Applied Force  = 20 N

μ = coefficient of friction between wall and floor = ?

m = mass of block = 5 kg

g = 9.8 m/s²

Therefore,

20 N = μ(5 kg)(9.8 m/s²)

μ = 20 N/49 N

μ = 0.4

Explanation:

20÷250 =12.5 and do it by using fourmulaes

Maximum instantaneous speed occurs when the mass moves through the region where the spring is compressed.

The rate at which the speed and direction of a moving object alter over time is known as acceleration. An item or point is said to be accelerated when it moves more quickly or more slowly in a straight path. Because the direction is always changing, travel on a circle accelerates even while the speed is constant.

The rate at which an object's velocity alters in relation to time is referred to as acceleration in physics. The acceleration of an object is the result of all the forces acting on it, according to Newton's Second Law. The meter per second squared is the unit of acceleration in the SI system (m s2).

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Explanation:

1) Kicking a ball.

2) Capture the ball by hand.

3) Push a car.

Answer:A 263 kg object moving 254m/s

Explanation:

Just did it

Answer:

B. A 263 kg object moving 254 m/s

Explanation:

The elliptical orbit of a satellite around the Earth is modeled by x²/47,472,100 + y²/44,222,500 = 1. Using the formula c² = a² - b², where c is the distance between the center and one of the foci, we find that c ≈ 1,678 km. Hence, the maximum distance between the satellite and the Earth is approximately 1,678 km.

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The given equation of the elliptical orbit is given as below:x²/47,472,100 + y²/44,222,500 = 1 We know that the distance between the earth and the satellite varies in an elliptical orbit, and the major axis of the elliptical orbit is twice the distance between the center and the farthest point on the orbit.

Therefore, we need to find the value of the major axis of the elliptical orbit to find the maximum distance between the satellite and the earth. Here, we can assume the y-axis as the major axis since it is more extended than the x-axis. Therefore, the value of a is given by

\(:2a = 2(1,804.2) = 3,608.4 km\)

Since the earth shares the same center as the orbit, the maximum distance between the satellite and the earth is given by the distance between the center and the farthest point on the orbit, which is half of the major axis of the elliptical orbit.

Thus, the maximum distance between the satellite and the earth is:

3,608.4/2 = 1,804.2 km + 6,370 km

= 8,174.2 km

Converting the answer into km, we get:

8,174.2 km = 8,174 km

(rounded off to the nearest whole number)Therefore, the maximum distance between the satellite and the earth is 6,890 km.

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Answer:

mass energy

Explanation:

because of the kinetic energy

The moment of inertia of an object is the measure of its resistance to rotational motion.

When an object is rotating around an axis, its moment of inertia determines the amount of torque required to change its angular acceleration. It depends on the distribution of mass around the axis of rotation and the shape of the object. The moment of inertia increases as the mass is distributed farther from the axis, which makes it more difficult to change the rotation speed.

For example, a thin ring and a solid disk with the same mass and radius have different moments of inertia, as the mass of the disk is concentrated at a greater distance from the axis. Moment of inertia is an important property in mechanics, as it explains how objects behave under rotational forces.

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The liquid A is present lower in the container as compared to liquid B due to more weight.

If two liquids A and B of relative densities 0.7 and 0.4 respectively then the lower density liquid remain at the top and higher density solution which is liquid A remains lower in the container because higher density solution has more weight.

So we can conclude that the liquid A is present lower in the container as compared to liquid B due to more weight.

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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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Employing a single cost comparison model provides a practical approach to evaluating the cost effectiveness of local sourcing in the context of distance and vulnerability in supply chains and procurement systems.

A practical step to determine the cost effectiveness of local sourcing in the given scenario would be to utilize a single cost comparison model.

This model would involve comparing the costs associated with local sourcing against those of distant sourcing, taking into account factors such as transportation costs, lead times, inventory holding costs, quality control measures, and any other relevant expenses.

The cost comparison model would involve gathering data on the various cost components associated with both local and distant sourcing options.

This would include collecting information on the prices of raw materials, transportation costs, import/export duties, storage costs, and any other relevant expenses.

The model would then calculate the total cost for each sourcing option and compare them to determine which one is more cost-effective.

By utilizing a single cost comparison model, organizations can systematically assess the financial implications of local sourcing.

This step allows for an objective evaluation of the costs involved and enables decision-makers to make informed choices based on a comprehensive understanding of the economic factors at play.

Additionally, it helps identify potential cost savings and highlights any potential risks or challenges associated with local sourcing.

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Let us find first the forces at 1, 2 & 3 points.

We know that ke= 8.99 * 109N.m2 / C2

The forces are: -

F1 = keq1q2 / r212 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {40 * 10-6 C} / {10 * 10-2 m}2

F1 = 359.6 N

F2 =keq1q3 / r213 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {30 * 10-6 C} / {30 * 10-2 m}2

F2 = 29.96 N

F3 = keq2q3 / r213 = {8.99 * 109N.m2 / C2} * {40 * 10-6 C} * {30 * 10-6 C} / {20 * 10-2 m}2

F3 = 269.7 N

Now,

The net force on q1 is F1 – F2,

i.e. F1 + F2 = 359.6 + 29.96

F(q1) = 389.56 N to the left

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Answer:

c and d

what i would do is ask the coach if you could take a minute to stretch and as soon as posible jump into the game

Explanation:

i play soccer lol

Answer: i'm pretty sure its  warm up your muscles before playing

Explanation:

if you don't u get hurt.

Answer:

acceleration = 2m/s^2

distance= 100 meters

Explanation:

acceleration = (final velocity - initial velocity) / time

acceleration = (20 m/s - 0 m/s) / 10 s

-----------------------------------------------------------------------------------

distance = (initial velocity * time) + (0.5 * acceleration * time^2)

since the car starts from rest, the initial velocity is 0.

distance = 0.5 * 2 m/s^2 * (10 s)^2

Answer:

V = 0.87 volt

Explanation:

Given that,

Charge, \(q=7.3\times 10^{-17}\ C\)

Electric potential energy, \(U=6.4\times 10^{-17}\ J\)

We need to find the value of electric potential at a point. The relation is as follows :

\(V=\dfrac{U}{q}\)

Where

V is electric potential

So,

\(V=\dfrac{6.4\times 10^{-17}}{7.3\times 10^{-17}}\\\\V=0.87\ V\)

So, the value of the electric potential at a point is equal to 0.87 Volts.

A polar jet is a belt of winds about 600 miles wide, flowing as fast as 400km/hr in its central "core".

The wind speeds are greatest where temperature differences between air masses are greatest, and often exceed 92 km/h . Speeds of 400 km/h  have been measured.One factor that contributes to the creation of a concentrated polar jet is the undercutting of sub-tropical air masses by the more dense polar air masses at the polar front. This causes a sharp north-south pressure (south-north potential vorticity) gradient in the horizontal plane, an effect which is most significant during double Rossby wave breaking events.

At high altitudes, lack of friction allows air to respond freely to the steep pressure gradient with low pressure at high altitude over the pole. This results in the formation of planetary wind circulations that experience a strong Coriolis deflection and thus can be considered 'quasi-geostrophic'. The polar front jet stream is closely linked to the frontogenesis process in midlatitudes, as the acceleration/deceleration of the air flow induces areas of low/high pressure respectively, which link to the formation of cyclones and anticyclones along the polar front in a relatively narrow region.

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Answer:

the scientific study of measurement.

Multiply field strength (N/kg) by mass (kg) to get weight (N)

At the start, the car is carrying

4.7 kg * (9.8 N/kg) = 46.06 N

of fuel.

At the end, it is carrying

3.0 kg * (9.8 N/kg) = 29.4 N.

Assuming the car remains completely intact, its weight was reduced by

46.06 N - 29.4 N = 16.66 N.

Light will emerge at the same angle as it incidence on the medium.

It doesn't matter how many mediums through which light passes it will always emerge at the same angle as it is incident. As the flat bottomed glass slab will act as a glass slab and will laterally displace the light ray without changing the angle of the emergence.

When a light ray passes from a rarer to a denser medium it will bend towards normal, when a light ray passes from a denser to a rarer medium it will bend away from normal. How much the ray will bend depends on the refractive index of the material. In the case of a glass slab the amount of deviation at the point when the ray touches the dish and the deviation at the point where the ray leaves the slab nullifies each other. hence the emerging ray is parallel or latterally displaced as compared to the incident ray

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