The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determin

how the cars perform based on which scenario?

on racetracks

Answer:

the newtons/second is an improper unit for speed

These relationships are referred to as the equation of motion.

s = ut + ½at². and v = u + at.

length of the Run way = 1350m

Take of speed of the plane is 90 m/s.

The three equations of motion are as follows:

from equation of motion

s = ut + ½at².

here u =0 a =3 m/s^2 t= 30s

put these values on the above equation

s= 1/2x 3x 30x30= 1350 m

length of the Run way = 1350m

from equation of motion ,

v = u + at.

= 0+ 3x 30 = 90m/s.

Take of speed of the plane is 90 m/s.

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Distance = 1350m, speed = 90m/s

Given:

Initially the Aero plane is at rest. Therefore, initial velocity:

u = 0m/s

Acceleration = 3m/\(s^{2}\)

Time taken = 30 seconds

So according to question, we have to find distance & speed

we know that

s = ut + 1/2a\(t^{2}\)

Putting all the values, we get S = 1350 m

Now to find speed, we know,

\(v^{2} = u^{2} + 2aS\)

Putting all the values,

v = \(\sqrt{8100}\)

v = 90m/s

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Answer:

4 bobux

Explanation:

one bobux

two bobux

three bobux

four bobux

Answer:

389 J

Explanation:

m = 15.0 kg, v = 7.2 m/s

Kinetic energy = mv²/2 = 15.0 * 7.2²/2 = 389 J

To solve this problem, we can use the principle of conservation of energy. According to this principle, the total mechanical energy of an object remains constant as long as there are no external forces doing work on the object.

The initial mechanical energy of the girl and sledge is the potential energy they have due to their height above the ground. This potential energy is given by the formula:

PE = m * g * h

where PE is the potential energy, m is the mass, g is the acceleration due to gravity, and h is the height above some reference point.

The final mechanical energy of the girl and sledge is the sum of their kinetic energy and potential energy at the end of their motion.

We can set up the following equation to represent the conservation of energy:

Initial PE + Initial KE = Final KE + Final PE

Since the girl and sledge start from rest, their initial kinetic energy is zero. Therefore, the equation simplifies to:

Initial PE = Final KE + Final PE

We can determine the distance the girl and sledge travel down the slope by calculating the final kinetic energy and potential energy and solving for the distance.

The final kinetic energy is given by the formula:

KE = 1/2 * m * v^2

where KE is the kinetic energy, m is the mass, and v is the velocity.

The final potential energy is given by the formula:

PE = m * g * h

where PE is the potential energy, m is the mass, g is the acceleration due to gravity, and h is the height above some reference point.

To calculate the final kinetic energy, we need to determine the velocity of the girl and sledge at the end of their motion. We can use the principle of conservation of energy to solve for the velocity.

Substituting the given values into the equation for conservation of energy, we get:

Initial PE = Final KE + Final PE

= 1/2 * 40 kg * v^2 + 40 kg * 9.8 m/s^2 * h

We can solve for the velocity by rearranging the terms and substituting the values for the mass, initial potential energy, and final potential energy:

v = sqrt((2 * (Final PE - Initial PE)) / m)

= sqrt((2 * (40 kg * 9.8 m/s^2 * h - 40 kg * 9.8 m/s^2 * h)) / 40 kg)

= 0

Since the velocity is zero, the final kinetic energy is also zero. This means that the final mechanical energy is equal to the final potential energy, which is equal to the initial potential energy.

We can therefore set up the following equation to solve for the distance the girl and sledge travel down the slope:

Initial PE = Final KE + Final PE

= 0 + Final PE

= Initial PE

This equation tells us that the initial potential energy is equal to the final potential energy. Since the girl and sledge start from rest at the top of the slope and end at rest at the bottom of the slope, the final potential energy is equal to the initial potential energy.

Therefore, the distance the girl and sledge travel down the slope is equal to the distance they travel up the slope, which is 25m.

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The net force on q3 due to q1 and q2 is \(-13.76 * 10^{-3} N\).

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The dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

Start by converting the rotational speed from rpm (revolutions per minute) to rad/s (radians per second). Since 1 revolution is equal to 2π radians, we can use the conversion factor:

Angular speed (ω) = (1100 rpm) × (2π rad/1 min) × (1 min/60 s)

ω ≈ 115.28 rad/s

The moment of inertia (I) is given as 2.0 × 10^-7 kg⋅m².

Use the formula for rotational kinetic energy:

Rotational Kinetic Energy (KE_rot) = (1/2) I ω²

Substituting the given values:

KE_rot = (1/2) × (2.0 × 10^-7 kg⋅m²) × (115.28 rad/s)²

Calculate the value inside the parentheses:

KE_rot ≈ (1/2) × (2.0 × 10^-7 kg⋅m²) × (13274.28 rad²/s²)

KE_rot ≈ 1.331 × 10^-3 J

Round the result to the proper number of significant figures, which in this case is three, as indicated by the given moment of inertia.

KE_rot ≈ 4.8 × 10^-4 J

Therefore, the dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

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Answer:

The temperature and gravity both affects the density

ANSWER:

Eight minutes

STEP-BY-STEP EXPLANATION:

We know that the distance from the Sun to the Earth is 150 million km and light moves at 300000 kilometers/second. Therefore, we can calculate the time as follows:

So it takes about 8 minutes

The pressure of the tank, when filled with water at a depth of 6 m, is approximately 580.124 atmospheres (atm). To calculate the pressure of the tank, one can use the equation: Pressure (P) = Density (ρ) × g × Depth (h)

Pressure (P) = Density (ρ) × g × Depth (h)

Given: Density of water (ρ) = 1000 kg/m³

Acceleration due to gravity (g) = 9.8 m/s²

Depth (h) = 6 m

Using the given values, one can calculate the pressure:

Pressure = 1000 kg/m³ × 9.8 m/s² × 6 m Pressure

= 58800 kg·m⁻¹·s⁻²

Now, let's convert the units to pascals (Pa) using the conversion 1 atm = 1.013 x \(10^5\) Pa:

Pressure = 58800 kg·m⁻¹·s⁻² × (1 atm / 1.013 x\(10^5\) Pa)

Pressure = 580.124 atm

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Air can do work when it exerts a force on an object and causes it to undergo displacement. The ability of air to do work is evident in various phenomena, such as wind pushing sails, fans moving objects, and air pressure powering pneumatic systems.

Air can do work through its ability to exert a force over a distance. Work is defined as the transfer of energy that occurs when a force is applied to an object and it undergoes displacement in the direction of the force. When air is in motion, it possesses kinetic energy and can exert a force on objects in its path, thus performing work.

To understand how air can do work, we can consider the example of a moving fan. When a fan is turned on, the blades start to rotate, creating a flow of air. As the air moves, it carries kinetic energy. When the moving air encounters an object, such as a piece of paper, the air molecules collide with the paper's surface and exert a force on it. This force causes the paper to move and displaces it from its initial position.

The work done by the air can be calculated using the equation:

Work = Force * Distance * cos(θ)

Where Force is the magnitude of the force exerted by the air, Distance is the displacement of the object, and θ is the angle between the direction of the force and the displacement.

In the case of air doing work on an object, the force exerted by the air is perpendicular to the direction of motion, resulting in θ = 90 degrees. Since cos(90) = 0, the equation simplifies to:

Work = Force * Distance * 0

Therefore, the work done by the air on the object is zero when the force exerted by the air is perpendicular to the displacement.

However, if the force exerted by the air is not perpendicular to the displacement, such as when blowing air at an angle to move an object, then work is performed. The air exerts a force on the object and causes it to move in the direction of the force, resulting in the transfer of energy.

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The current (in amperes) the frying pan draws from the 500 volt circuit, given that it has a resistance of 25 ohms is 60 amperes

From the question given above, the following data were obtained:

The current drawn by the frying pan can be obtained as follow:

Voltage (V) = Current (I) × resistance (R)

Inputting the given parameters, we have:

1500 = Current × 25

Divide both sides by 25

Current = 1500 / 25

Current = 60 amperes

Thus, from the above calculation we can conclude that the current drawn by the frying pan is 60 amperes

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The BEST option that describes the effect of Thom drawing a line of bicycles with the first one in full view and the others behind it in partial view is C. overlapping of objects.

A partial view is a view of an object or scene that only shows a portion or a part of it, as opposed to a full view that shows the entire object or scene. In art or photography, a partial view can be used to create a sense of intrigue or mystery, as it leaves some details to the viewer's imagination. In architecture or interior design, a partial view can be used to create a sense of openness and connection between spaces, as it allows glimpses of other areas without revealing everything at once. In the context of the original question, the line of bicycles is partially visible, meaning that only a portion of each bicycle is visible due to the overlap effect created by their arrangement.

Here,

Overlapping is a technique in art where objects are positioned so that some are partially or fully covered by others. In this case, the first bicycle is fully visible, and the others are partially hidden behind it, creating an overlapping effect. This technique can be used to create depth and perspective in a drawing and can also be used to create a sense of movement, as in this case with the line of bicycles.

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The final velocity of the ball that is dropped from a height of 200m is v = 44.73 m/s .

The rate at which an object is travelling in one direction is referred to as its velocity. an automobile traveling north on a highway, or a rocket taking off. Its velocity vector's absolute value always is equal to the motion's speed because it is a scalar.

Given the initial velocity of the ball (u) =  0

Distance travelled by the ball (s) = 200m

Acceleration (a) = 10 m/s²

As we know:

v² = u² + 2as

Putting values:

v² = 0+2 × (10 m/s²) × (200 m)

v = 44.73 m/s.

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Answer:

Let's start by calculating how much of a head start Car A has in distance before Car B starts.

In 3 minutes, Car A will have travelled:

d = r * t = (60 km/h) * (3/60) h = 3 km

So when Car B starts, Car A is 3 km ahead.

Now let's consider the time it takes for both cars to meet. Let's call the time it takes for both cars to meet t.

During that time, Car A will travel at a speed of 60 km/h, and Car B will travel at a speed of 70 km/h.

The distance that Car A will travel during that time is:

dA = 60 km/h * t

The distance that Car B will travel during that time is:

dB = 70 km/h * t

The total distance between the two cars when they meet is:

d = dA + dB

We want to find the value of t that makes dA + dB = 3 km (the distance that Car A is ahead of Car B when Car B starts).

Substituting the expressions for dA and dB, we get:

60 km/h * t + 70 km/h * t = 3 km

Simplifying, we get:

130 km/h * t = 3 km

t = 3 km / 130 km/h

t = 0.0231 h

Now we can calculate the distance that both cars will have travelled when they meet:

dA = 60 km/h * 0.0231 h = 1.38 km

dB = 70 km/h * 0.0231 h = 1.61 km

d = dA + dB = 1.38 km + 1.61 km = 2.99 km

Therefore, the two cars will draw level after travelling approximately 2.99 km from the starting point.

It would require 28618.56 J of heat to raise the temperature of 90 g of water from 12°C to 88°C.

Given that:

Mass of water m = 90g

Initial temperature = 12°C

Final temperature = 88°C,

The amount of heat required to raise the temperature of a substance is given by:

Q = mCΔT

Where Q is the amount of heat, m is the mass of the substance, C is the specific heat capacity of the substance, and ΔT is the change in temperature.

Note that: the specific heat capacity of water is 4.184 J/g°C.

So, for raising the temperature of 90 g of water from 12°C to 88°C, we have:

Q = mCΔT

Q = (90 g) × (4.184 J/g°C) × (88°C - 12°C)

Q = (90 g) × (4.184 J/g°C) × (76°C)

Q = 28618.56 J

Therefore, the required heat is 28618.56 Joules.

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Answer:

Explanation:

The energy transfer are not changing in kinetic energy. They are changes in bonding energy between the molecules.

Answer: Valid claim

Explanation:

Given

Work output is \(W=400\ kJ\)

Work input is \(Q=1200\ kJ\)

The temperature of the source \(T_h=550\ K\)

The temperature of the sink is \(T_l=350\ K\)

Efficiency is given by

\(\eta =\dfrac{\text{W}}{\text{Q}}\times 100\)

Insert the values

\(\Rightarrow \eta=\dfrac{400}{1200}\times 100\\\\\Rightarrow \eta=\dfrac{100}{3}\\\\\Rightarrow \eta=33.3\%\)

For ideal cycle it is

\(\Rightarrow \eta=\dfrac{T_h-T_l}{T_l}\times 100\\\\\Rightarrow \eta=\dfrac{550-350}{550}\times 100\\\\\Rightarrow \eta=36.36\%\)

The efficiency of the cycle is less than the ideal situation, therefore, it is valid claim.

Answer:

The velocity of the box is related to the angular velocity of the spool, which is given by the equation:

v = r * ω

where r is the radius of the spool and ω is the angular velocity of the spool. The angular velocity of the spool, in turn, is related to the torque applied to the spool by the tension in the string, which is given by the equation:

τ = I * α

where τ is the torque, I is the moment of inertia of the spool, and α is the angular acceleration of the spool.

The tension in the string is equal to the weight of the box, which is given by:

T = m * g

Putting all of these equations together, we can solve for the time it takes for the box to reach the floor. Here's how:

First, we can find the angular acceleration of the spool using the torque equation:

τ = I * α

T = m * g = τ

m * g = I * α

α = (m * g) / I

α = (35.30 kg * 9.81 m/s^2) / 4.00 kg*m^2

α = 86.53 rad/s^2

Next, we can find the angular velocity of the spool using the kinematic equation:

ω^2 = ω_0^2 + 2 * α * θ

where ω_0 is the initial angular velocity (which is zero), θ is the angle through which the spool has turned (which is equal to the distance the box has fallen divided by the radius of the spool), and ω is the final angular velocity (which is what we want to find). Solving for ω, we get:

ω^2 = 2 * α * θ

ω = sqrt(2 * α * θ)

ω = sqrt(2 * 86.53 rad/s^2 * (3.50 m / 0.10 m))

ω = 166.6 rad/s

Finally, we can find the time it takes for the box to reach the floor using the equation:

v = r * ω

v = 0.10 m * 166.6 rad/s

v = 16.66 m/s

t = d / v

t = 3.50 m / 16.66 m/s

t = 0.21 s

Speed = distance / time

Speed = 34 km / 0.68 hrs

Speed = 50 km/hr

Answer:

the answer is equal to non zero

A person born in the United States is considered a citizen of the country, according to the 14th Amendment's "Citizenship" provision.

Citizens of both the United States and the State in which they live include everyone who was born or naturalised in the country and is subject to its laws. No State may enact or carry out any legislation that restricts the rights or privileges of US citizens; no State may rob anyone of their life, liberty, or property without first providing them with a fair trial; and no State shall deny anyone living under its jurisdiction the equal protection of the law.

Based on the first clause of Section 1,1, the Court has determined that a child born in the United States to Chinese parents who were not qualified for naturalisation themselves is nonetheless a citizen of the United States with all the rights.

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Answer:

Answer is LC Cirenit (seres)

Answer:

A? Cause is needs the Velocity more than the Heading.

part a) If Q increases by 5 times its original value, the electrostatic force (F) will increase5 times as well.

part b) If r is halved (reduced by 2), the force will become four times stronger (since 2² = 4).

part c) If Q1 is positive and Q2 is negative, the charges will attract each other.

part d) If the force that Q1 exerts on Q2 is 5 times larger than the force that Q2 exerts on Q1 is same.

The electrostatic force is described as the force of attraction or repulsion between two charged particles.

With regards to Coulomb's Law, we have that the electrostatic force between two charges separated by a distance is :

Force = k * (Q1 * Q2) / r²

Where:

F_ =  electrostatic force

k = electrostatic constant

Q1 and Q2 =  magnitudes of the charges

r = distance

for case a:

If one of the charges, Q1 or Q2, increases by 5 times then the electrostatic force  will also increase by 5 times.

case b)

If the distance between the charges, r, is halved, the electrostatic force   will become four times stronger because (1/r²).

for case c.

if Q1 is positive and Q2 is negative, the charges will attract each other because of magnetic laws.

for case d.)

If the force that Q1 exerts on Q2 is 5 times larger than the force that Q2 exerts on Q1 is same as there is a resulting stronger gravitational or electromagnetic force.

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Answer:

Δx = -1.27 m

the boat moves away from the shore

Explanation:

Let's analyze the exercise a little, to know when the boat has moved, we can fixate on a point, let's use the point of the center of mass, before and after the movement of people.

The center of mass is defined by.

           \(x_{cm}\)= 1 /M ∑ m_i  x_i

where M is the total mass of the object, x_i and m_i are the positions and masses of each part of the system.

let's find the total mass  

         M = m_boat + m_Juliet + m_Romeo

         M = 100 + 50 + 70

         M = 220 kg

now let's look for the center-mass position

initial. Before the movement of people

       x_{cm1} = 1/M (x_boat m_boat + x_juliet  m_juliet + x_romeo m_romeo)

Let's find the position of each object, let's fix our reference system on the front of the boat

The boat its center of mass coincides with its geometric center

       x_boat = 2 m

Julliet is sitting in the front of the boat

       x_juliet = 0 m

Romeo is sitting in the back of the boat

       x_romeo = 4 m

we substitute

      x_{cm1} = 1/220 (2 100 + 50 0 + 70 4)

      x_{cm1} = 2.1818 m

final. After the movement of people

positions

boat

     x_boat = 2 m

Juliet

     x_juliet = 0 m

Romeo

     x_romeo = 0 m

we substitute

     x_{cm2} = 1/220 (2 100 + 50 0 + 500 0)

     x_{cm2} = 0.9090 m

the movement of the boat is

    Δx = x_cm2 - xcm1

    Δx = 0.9090 - 2.1818

    Δx = -1.27 m

The negative sign indicates that the boat moves in the opposite direction to the movement of people, therefore the boat moves away from the shore

The reaction of load L is 0 (no horizontal force), and the reaction of load R is 10 kN (vertical upward force).

To determine the reactions of the loads L and R, consider the equilibrium of the forces acting on the structure.

First, analyze the vertical equilibrium. The sum of the vertical forces must be zero:

ΣFy = R − 7 kN − 3 kN

ΣFy = 0

This gives:

R = 10kN

Next, analyze the horizontal equilibrium. The sum of the horizontal forces must be zero:

ΣFx = L

ΣFx = 0

This indicates that there is no horizontal force acting on the structure.

Therefore, the reaction of load L is zero (no horizontal force), and the reaction of load R is 10 kN (vertical upward force).

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It is simple to determine the size of the electric field by calculating the force per charge on the test charge. The standard metric units for electric field strength are derived from this concept.

Formulas for a vector's magnitude Magnitude Formula for a Vector with the Origin as the End Point. | v | = x 2 + y 2. When the starting points are (x1, y1) and the ending points are (x2, y2).

Equation E = kQ/r2 determines the size of the electric field (E) created by a point charge with a charge of magnitude Q at a point r distant from the point charge, where k is a constant with a value of 8.99 x 109 N m2/C2.

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The charge of an electros is always negative. Therefore, the correct option is B.