Two identical cars approach each other head-on while traveling at the same speed v.A. What does an observer in the Earth reference frame measure for the speed of the zero-momentum reference frame of this two-car system? Express your answer in terms of v.B. Suppose the same cars are traveling in the same direction at the same speed v. Now what does an observer in the Earth reference frame measure for the speed of the zero-momentum reference frame? Express your answer in terms of v.

Answer:

The distance in front of the target is 9.524 km

Explanation:

Given;

height of the bomber above the ground, h = 9 km = 9000 m

velocity of the bomber, v = 800 km/h = 222.22 m/s

The time the bomb will get to the target is given by;

\(t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2*9000}{9.8} }\\\\ t = 42.857 \ s\)

The lead distance or distance in front of the target is given by;

x = vt

x = (222.22 m/s) x (42.857 s)

x = 9523.68 m

x = 9.524 km

Therefore, the distance in front of the target is 9.524 km

In front of the target, the distance will be "9.524 km".

According to the question,

Bomber's height, h = 9 km or,

                                = 9000 m

Bomber's velocity, v = 800 km/h or,

                                  = 222.22 m/s

Now,

The time will be:

→ t = \(\sqrt{\frac{2h}{g} }\)

By substituting the values, we get

     = \(\sqrt{\frac{2\times 9000}{9.8} }\)

     = \(\sqrt{\frac{18000}{9.8} }\)

     = 42.857 s

hence,

The lead distance will be:

→ x = vt

By putting the values,

     = 222.22 × 42.857

     = 9523.68 or,

     = 9.524 km

Thus the above answer is correct.

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Answer:

during respiration physical and chemical change both are occuring

Explanation:

A burning candle is a great example.

First the wax melts (physical change).

Then when the melted wax is hot enough, it combines with oxygen in the air, forms carbon monoxide and carbon dioxide, and drifts away as hot gases (chemical change).  

The factor that can have a significant influence on a planet’s surface temperature is its atmosphere.

The atmosphere plays a fundamental role in the Earth planet's temperature because it allows the entry and out of certain types of radiation that may increase the temperature.

The role of the atmosphere in the Earth's temperature is well documented because our temperature is thick and it increases its homeostatic temperature balance.

In conclusion, the factor that alters a planet’s surface temperature is its atmosphere.

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The equity multiplier of Synovec Company is 1.00, its return on equity is 10.4%, and its net income is $81,840.

The equity multiplier is a measure of the amount of total assets that a company has financed with equity capital. In the case of Synovec Company, the equity multiplier is calculated as follows:

Equity Multiplier = Total Assets / Equity

= ($785,000) / ($785,000)

= 1.00

This means that Synovec Company has used its equity to finance all of its assets.

Return on equity (ROE) measures how much net income a company has generated relative to its total equity. It is calculated as follows:

ROE = Net Income / Equity

= ($??? ) / ($785,000)

= 10.4%

This means that Synovec Company has earned a 10.4% return on its total equity.

The net income of Synovec Company can be calculated as follows:

Net Income = ROE x Equity

= (10.4%) x ($785,000)

= $81,840

This means that Synovec Company has earned a net income of $81,840.

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A DC motor is powered with Ea = 400V, the armature resistance is Ra = 20, the torque constant of the motor is K+ = 1 Nm/A.

The load torque intercepts the motor torque in two places, only one will be positive, drop you will again need to solve = 0. d the given details are Ea = 400VRa = 20K+ = 1 Nm/A

To find; Gear ratio G required to drive this load at its maximum operating speed.

Formula used: θ=K+ * Ia The motor torque, Tm = K+ * Ia The load torque, TL = J * dw / G The armature current, Ia = (Ea - V) / Ra By equating the motor torque and load torque, we have; K+ * Ia = TL The load torque is positive, so we have;TL = J * dw / G Since the load is operating at maximum speed, d w = 0So, TL = 0 = J * 0 / G

Thus, G is not found in the equation.

So, we can conclude that G does not affect the maximum speed of the motor. The maximum speed is determined by the back EMF, Ea, and the motor constants, K+ and Ra.

So, the gear ratio G is irrelevant in determining the maximum speed of the motor.

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Answer:

5.00 × 10^14 Hz

Explanation:

The wavelength of the light in the medium can be calculated by using the formula:

λ = v / f

Where;

λ = wavelength (m)

v = speed of light

f = frequency (Hz)

From the provided information, λ = 600 nm (600 × 10^-9m), v = 3 × 10^8m/s.

λ = v / f

λ = 3 × 10^8/600 × 10^-9

λ = 0.005 × 10^(8+9)

λ = 0.005 × 10^17

λ = 5.00 × 10^14 Hz

The frequency of the light in the medium is 5.00 × 10^14 Hz

The minimum thickness of the soap-bubble film that results in constructive interference in the reflected light is 225 nm.

To calculate the minimum thickness of a soap-bubble film that results in constructive interference in the reflected light, we can use the equation for the thickness of a soap film:

2t = mλ/n

where t is the thickness of the film, m is the order of the interference (1 for constructive interference), λ is the wavelength of the light, and n is the index of refraction of the film.

Substituting the given values, we get:

2t = (1)(600 nm)/(1.33)

Simplifying the equation, we get:

t = 225 nm

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The force of interaction between a current and a magnetic field is known as the Lorentz force, and it is directly proportional to the angle between the two.

So, when the angle between the current and the magnetic field increases, the force acting between them also increases. This is because the Lorentz force is perpendicular to both the current and the magnetic field, and its magnitude is proportional to the product of the current and the magnetic field strength.

When the angle between the current and the magnetic field increases, the product of the current and the magnetic field strength also increases, leading to a greater force of interaction. On the other hand, when the angle between the two decreases, the force of interaction also decreases.

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Answer:

it would be coal

Explanation:

coal is the most used energy source in many countries as of China , India and, the United States

Coal is a primary energy source used by power plants to generate electricity

Electricity generation plants convert the chemical energy of fuel into electricity. Coal, oil, natural gas and nuclear fuels are the energy sources most commonly used for generating electricity.

"Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests."

"A fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons. "

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Part 1) The width of the river is approximately 120.46 meters and the current speed is approximately 3.37 m/s. Part 2)  The shortest time to cross the river is approximately 20.08 seconds and the boat would land approximately 67.74 meters downstream from the starting point on the far bank of the river.

Part 1: To determine the width of the river and the current speed, we can analyze the motion of the boat in both the northbound and southbound directions.

Let's assume the width of the river is represented by "d" and the current speed is represented by "v." Since the boat's speed relative to the river is 6.00 m/s in the northbound direction and 7.40 m/s in the southbound direction, we can set up the following equations based on the time it takes to cross the river:

For the northbound direction:

d = (boat's speed relative to the river) * (time taken to cross the river)

d = 6.00 m/s * 20.1 s

d = 120.6 m

For the southbound direction:

d = (boat's speed relative to the river + current speed) * (time taken to cross the river)

d = (7.40 m/s + v) * 11.2 s

Now we have two equations with two variables (d and v). Solving these equations simultaneously will give us the values of d and v.

120.6 m = (7.40 m/s + v) * 11.2 s

Simplifying the equation:

120.6 m = 82.88 m/s + 11.2v

11.2v = 120.6 m - 82.88 m/s

11.2v = 37.72 m/s

v = 37.72 m/s / 11.2

v ≈ 3.37 m/s

Now that we have the current speed (v ≈ 3.37 m/s), we can substitute this value back into one of the earlier equations to find the width of the river:

d = (7.40 m/s + v) * 11.2 s

d = (7.40 m/s + 3.37 m/s) * 11.2 s

d = 10.77 m/s * 11.2 s

d ≈ 120.46 m

Part 2: To find the shortest time to cross the river, we need to take into account the current. Since the current is flowing from east to west, we should aim to reach the far bank downstream from our initial position.

The shortest time to cross the river can be achieved by pointing the boat at an angle that maximizes the effect of the current to carry us downstream. This angle can be determined using trigonometry. Let's call this angle θ.

tan(θ) = (current speed) / (boat's speed relative to the river)

tan(θ) = 3.37 m/s / 6.00 m/s

θ ≈ 29.23 degrees

By pointing the boat at an angle of approximately 29.23 degrees downstream, we can minimize the impact of the current and maximize our speed across the river. The boat's speed relative to the river is still 6.00 m/s, so the shortest time to cross the river would be the time it takes to cover the width of the river (120.46 m) at this speed:

Shortest time = distance / speed

Shortest time = 120.46 m / 6.00 m/s

Shortest time ≈ 20.08 s

As for the landing point on the far bank, it would be downstream from the starting position by a distance equal to the current speed multiplied by the

shortest time:

Landing point = (current speed) * (shortest time)

Landing point ≈ 3.37 m/s * 20.08 s

Landing point ≈ 67.74 m

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The efficiency of the machine is approximately 90.9%. Therefore option (c) is correct. The efficiency of the machine, which is the ratio of output work to input work, is approximately 90.9%. This means that about 90.9% of the input work is effectively utilized to perform the desired task of lifting the weight.

The efficiency of a machine is defined as the ratio of output work to input work, expressed as a percentage. The formula for efficiency is: efficiency = (output work / input work) × 100%.

Given:

Input force (F1) = 11 N

Effort arm distance (d1) = 0.4 m

Weight (resistance force, F2) = 40 N

Resistance arm distance (d2) = 0.1 m

To calculate the work done by the input force, we use the formula: input work = input force × input distance.

Input work = F1 × d1 = 11 N × 0.4 m = 4.4 J

Similarly, to calculate the work done by the weight, we use the formula: output work = output force × output distance.

Output work = F2 × d2 = 40 N × 0.1 m = 4 J

Now, we can calculate the efficiency:

Efficiency = (output work / input work) × 100%

Efficiency = (4 J / 4.4 J) × 100% ≈ 90.9%

Therefore, the efficiency of the machine is approximately 90.9%.

The efficiency of the machine, which is the ratio of output work to input work, is approximately 90.9%. This means that about 90.9% of the input work is effectively utilized to perform the desired task of lifting the weight. The calculations involve finding the input work done by the input force and the output work done by the weight. By dividing the output work by the input work and multiplying by 100%, we obtain the efficiency percentage. In this case, the efficiency is approximately 90.9%.

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Answer:

-0.28 m/s²

Explanation:

acceleration, a = (v - u)/t where u = initial velocity = 30 km/hr = 30 × 1000/3600 = 8.33 m/s and v = final velocity = 20 km/hr = 20 × 1000/3600 = 5.56 m/s and t = time = 10 s.

Substituting the values of the variables into the equation, we have

a = (v - u)/t

= (5.56 m/s - 8.33 m/s)/10 s

= -2.77 m/s ÷ 10 s

= -0.277 m/s²

≅ -0.28 m/s²

The soil loss in  \(Mg ha^{-1}\) (Ton/ha) if the bulk density of the soil is 1.01  \(Mg m^{-3}\)  is option a. 0.202 Mg/ha.

For expressing the soil loss in \(Mg ha^{-1}\), need to convert the units appropriately. First, convert the soil loss from millimetres (mm) to meters (m) by dividing it by 1,000 (1 mm = 0.001 m). Thus, the soil loss is 0.0002 m.

Next, calculate the volume of soil lost per unit area (ha). The volume can be obtained by multiplying the soil loss (0.0002 m) by the area (ha). Since the bulk density of the soil is given as 1.01 \(Mg m^{-3}\), can convert the volume to mass by multiplying it by the bulk density.

Using the formula:

Soil loss (Mg ha-1) = Soil loss (m) × Bulk density (\(Mg m^{-3}\)) × Area (ha)

Substituting the values:

Soil loss (\(Mg ha-1\)) = 0.0002 m × 1.01 \(Mg m^{-3}\) × 1 ha

Calculating the result:

Soil loss (\(Mg ha-1\)) = 0.0002 × 1.01 = 0.000202 \(Mg ha-1\)

Therefore, the correct answer is option a. 0.202 Mg/ha.

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The phenomenon of pressure waves emanating from the bullet, causing damage remote from its path, is known as B. cavitation.

Cavitation occurs when a bullet passes through a medium, like air or water, at high velocity, causing the medium to compress and expand rapidly. The rapid compression and expansion create a series of shock waves that can cause damage beyond the path of the bullet itself. Cavitation can cause damage to objects as well as tissue and organs, as the shock waves cause significant disruption. The effects of cavitation can be seen in other forms of high-velocity projectiles, such as missiles. Cavitation can also be used in underwater applications to create shock waves that can be used to clear debris or even kill marine life.

In summary, cavitation is the phenomenon of pressure waves emanating from a bullet, causing damage remote from its path. This phenomenon can cause considerable damage beyond the path of the bullet, as well as having practical applications in underwater engineering. Therefore the correct option is B

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Answer:

35 to 52 minutes

Please mark me as the brainliest

The pressure at the bottom of the container is the sum of the pressures due to the weight of the fluids and atmospheric pressure.

To determine the depth of the mercury in the cylindrical container, we can use the concept of pressure and the hydrostatic equation.

The pressure at a given depth within a fluid is determined by the weight of the fluid above it. The expression that shows how the pressure due to a column of two fluids depends on their weights and the cross-sectional area of the column is:

Pressure = (Density of Fluid 1) × (Gravity) × (Height of Fluid 1) + (Density of Fluid 2) × (Gravity) × (Height of Fluid 2) + ...

In this case, we have two fluids: mercury and water. The pressure at the bottom of the container is 1.3 atmospheres, which is the sum of the pressure due to the weight of the mercury column and the pressure due to the weight of the water column.

Let's denote the depth of the mercury as h and the remaining depth filled with water as (0.3 - h). The pressure due to the weight of the mercury column is given by:

Pressure due to mercury = (Density of Mercury) × (Gravity) × (Depth of Mercury) = (1.36 x 10^4 kg/m^3) × (9.8 m/s^2) × h

The pressure due to the weight of the water column is given by:

Pressure due to water = (Density of Water) × (Gravity) × (Depth of Water) = (1000 kg/m^3) × (9.8 m/s^2) × (0.3 - h)

Since the total pressure at the bottom is 1.3 atmospheres, we can set up the equation:

Pressure due to mercury + Pressure due to water = 1.3 atmospheres

(1.36 x 10^4 kg/m^3) × (9.8 m/s^2) × h + (1000 kg/m^3) × (9.8 m/s^2) × (0.3 - h) = 1.3 × (101325 Pa)

Simplifying the equation and solving for h:

(1.36 x 10^4 × 9.8 × h) + (1000 × 9.8 × (0.3 - h)) = 1.3 × 101325

Solving this equation will give us the depth of the mercury, h.

Now, let's discuss the relationship between the pressure at the bottom of the container, the pressure due to the weight of the fluids, and atmospheric pressure. The pressure at the bottom of the container is the sum of the pressure due to the weight of the fluids and the atmospheric pressure acting on the surface of the fluids.

Mathematically, we can express it as:

Pressure at bottom = Pressure due to weight of fluids + Atmospheric pressure

In this case, the pressure at the bottom is 1.3 atmospheres, and we need to consider the pressures due to the weight of the mercury and water as calculated earlier. The atmospheric pressure is typically around 1 atmosphere (101325 Pa).

Therefore, the pressure at the bottom of the container is the sum of the pressures due to the weight of the fluids and atmospheric pressure.

In summary, to determine the depth of the mercury in the cylindrical container, we use the hydrostatic equation and set up an equation considering the pressures due to the weight of the mercury and water columns. The pressure at the bottom of the container is the sum of the pressures due to the weight of the fluids and atmospheric pressure. Solving the equation will give us the depth of the mercury, and understanding the relationship between the pressures allows us to determine the overall pressure at the bottom of the container.

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To find the specific heat capacity, we can use the formula Q = mcΔT, where Q is the amount of heat energy required, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature.

Given:
- Mass of the object (m) = 50.0g
- Amount of heat energy required (Q) = 1,145 joules
- Change in temperature (ΔT) = 10.0°C

Using the formula Q = mcΔT, we can rearrange it to solve for c:
c = Q / (mΔT)
Plugging in the given values, we get:
c = 1,145 J / (50.0 g x 10.0 °C)
c = 2.29 J/g°C

Therefore, the specific heat capacity of the object is 2.29 J/g°C.

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Answer:

Explanation:

i believe a if not c

Electrons from the charged object as conduction are the charging by contact

Conduction is indeed a method of charging by contact. In conduction, charges are transferred between two objects that are in contact with each other. When an uncharged object comes into contact with a charged object, electrons will flow from the charged object to the uncharged object, until both objects have the same charge.

In solids, conduction occurs when electrons flow through the material, moving from atom to atom. Metals, such as copper and aluminum, are good conductors of electricity because their electrons are not tightly bound to their atoms and can easily flow through the material. Insulators, such as rubber and plastic, are poor conductors of electricity because their electrons are tightly bound to their atoms and do not flow easily through the material.

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The number of Neon’s p-orbitals that are completely filled in its ground state is 3.

In Neon's case, since its p-orbitals are located on the second energy level, it contains a total of three p-orbitals 2px, 2py and 2pz and all three of them are filled as there are 4 electrons in s orbital and in total of 6 electrons in its p-orbital, thus completely filling it.

This configuration with all the orbitals completely filled also makes it a noble gas. It is due to the fact that it has no extra orbital to exchange electron from other element and form a bond.

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It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude.

Answer:

They have magnitude +direction

Explanation:

eexample : force,displacement, velocity e.t.c

Answer:

In order to convert density to grams, you have to put the mass on one side of the equation, and the density and the volume on the other. Therefore, d * v = m. Multiply the density by the volume. Using the example in step 1, you would multiply 2 g/mL by 4mL.

Explanation:

ok

The correct statement regarding the inelastic collision of two object is e, "The total kinetic energy of the objects after the collision is less than it was before the collision".

Whenever two bodies collide with each other, it does not matter whether the collision is elastic or inelastic. The Linear momentum of the the system is always conserved in each and every collision.

But the same is not true for Kinetic Energy,

The kinetic energy of the system will be less after the collision in comparison to the kinetic energy before the collision.

Some of the kinetic energy will be converted into sound energy or in heat energy during the collision.

When two objects collide in inelastic collision, it is not compulsory that they will bounce back. It is highly possible that they might get stuck to each other. Also, the kinetic energy do not necessarily becomes zero. It get reduced but being completely zero is not certain.

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Answer:

D. A difference in resistance

      The sum of the forces exerted on an object must be zero since, in accordance with Newton's first law of motion, an object moving at a constant speed experiences no net external force. F net = 0 F net = 0 or F = 0 are two ways to express mathematically that an object is not being affected by any net external forces.

First Law of Newton: Inertia

According to Newton's first law, unless pushed to alter its condition by the operation of an external force, every object will continue to be at rest or in uniform motion in a straight line. Inertia is the propensity to resist changes in a condition of motion.

He second equation swaps out p for mv since p=mv. V stands for the object's speed, t stands for time, and F stands for force.

Newton's second law of motion uses the inertia formula "Force = Mass * Acceleration" to describe this phenomena and property. According to the formula, heavier objects need greater force to modify their acceleration.

Newton's first law is demonstrated by the motion of a ball falling through the atmosphere or by the firing of a miniature rocket into the atmosphere. The first law can also be used to explain how a kite moves as the wind changes.

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The spaceship is traveling at a speed of 1877.8 millimeters per second.

The spaceship is traveling at a speed of 4200 miles per hour. To convert this speed to millimeters per second, we need to perform a few conversions.

First, let's convert miles to kilometers. There are approximately 1.60934 kilometers in one mile.

So, the speed in kilometers per hour is 4200 miles per hour multiplied by 1.60934 kilometers per mile. Next, let's convert kilometers per hour to meters per second.

There are 1000 meters in one kilometer, and 3600 seconds in one hour. So, the speed in meters per second is the speed in kilometers per hour divided by 1000 meters per kilometer, and then divided by 3600 seconds per hour.

Finally, let's convert meters per second to millimeters per second. There are 1000 millimeters in one meter. So, the speed in millimeters per second is the speed in meters per second multiplied by 1000 millimeters per meter.

Let's calculate the conversion step-by-step:

1. Convert miles to kilometers: 4200 miles/hour × 1.60934 kilometers/mile = 6758.048 kilometers/hour

2. Convert kilometers to meters and hours to seconds: 6758.048 kilometers/hour ÷ 1000 meters/kilometer ÷ 3600 seconds/hour = 1.8778 meters/second

3. Convert meters to millimeters: 1.8778 meters/second × 1000 millimeters/meter = 1877.8 millimeters/second

Therefore, the spaceship is traveling at a speed of 1877.8 millimeters per second.

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Answer:

Answer: B. Explanation: For an object to accelerate the force on it must be increased. According to Newton's second law of motion.

Explanation:

I do Accelerate to good luck

Answer:

Mass and kinetic energy have a positive relationship, which means that as mass increases, kinetic energy increases, if all other factors are held constant.

In this state, Kinetic energy is equal to half of the product mass and velocity. SI unit is joules. So it's if the mass is doubled then the kinetic energy also gets doubled.

Answer:  (You can cut out whatever part you don't need.)

X-rays are a form of electromagnetic radiation. X-rays have high energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.     However, getting repeatedly exposed to x-ray radiation may damage cells in the body, and the risk of cancer increases the more you're exposed to that radiation. This is why you should use the x-ray in limited amounts