How fast does a 15g tennis ball move if it has 50J of Kinetic energy?

The phenomenon of roofs of houses being blown off during a tornado or hurricane can be explained using Bernoulli's principle.

When wind flows over a roof, it creates an area of low pressure above the roof. According to Bernoulli's principle, where the speed of a fluid increases, the pressure within the fluid decreases.Therefore, as the wind speed over the roof increases, the air pressure above the roof decreases.

This creates a pressure difference between the top and bottom of the roof. The higher pressure below the roof pushes up on it, while the lower pressure above the roof pulls it upward.During a tornado or hurricane, the wind speed can increase rapidly, creating a large pressure difference between the top and bottom of the roof.

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The concept of "centripetal motion" does not exist. The word "centripetal," which exclusively refers to forces or accelerations that are directed toward a center, literally means "seeking the center."

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The speed of the block after the bullet embeds itself in the block is 6.01 m/s. The kinetic energy of the bullet plus the block before the collision is 1866 J. The kinetic energy of the bullet plus the block after the collision is  111.3 J. The rise in thermal energy of the bullet plus block as a result of the collision is 1755.7 J.

A). The final momentum of the system is:

[tex]p_f[/tex] = (m_bullet + m_block) * [tex]v_f[/tex]

[tex]p_f[/tex] = (0.093 kg + 3 kg) * [tex]v_f[/tex]

[tex]p_f[/tex] = 3.093 kg * [tex]v_f[/tex]

[tex]p_i = p_f[/tex]

18.6 kg*m/s = 3.093 kg * [tex]v_f[/tex]

[tex]v_f[/tex]= 6.01 m/s

B). The kinetic energy of the bullet plus the block before the collision is:

[tex]K_i[/tex] = (1/2) * [tex]m{_bullet}[/tex] * v_bullet² + (1/2) *[tex]m{_block}[/tex] * 0²

[tex]K_i[/tex] = (1/2) * 0.093 kg * (200 m/s)²

[tex]K_i[/tex] = 1866 J

c) The kinetic energy of the bullet plus the block after the collision is:

[tex]K_f[/tex] = (1/2) * ([tex]m{_bullet}[/tex] + [tex]m{_block}[/tex]) *[tex]v_f[/tex]²

[tex]K_f[/tex] = (1/2) * 3.093 kg * (6.01 m/s)²

[tex]K_f[/tex] = 111.3 J

D) [tex]Delta_E = K_i - K_f[/tex]

[tex]Delta_E = 1866 J - 111.3 J[/tex]

[tex]Delta_E = 1755.7 J[/tex]

Momentum refers to the physical property of an object in motion that depends on both its mass and velocity. It is defined as the product of an object's mass and velocity and is a vector quantity, meaning it has both magnitude and direction. In other words, momentum is the measure of how much force an object can apply when it collides with another object.

According to the law of conservation of momentum, the total momentum of a system remains constant unless acted upon by an external force. This means that if two objects collide, the total momentum of the system before the collision is equal to the total momentum after the collision, even if the objects' velocities and directions change.

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Answer: A

Explanation:

Answer:

47.86 N

Explanation:

The magnetic force on a current-carrying wire in a magnetic field is given by the formula:

F = BIL sinθ

where F is the magnetic force, B is the magnetic field, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.

Substituting the given values, we get:

F = (1.99 T) x (10.7 A) x (2.22 m) x sin(40.4°)

F = 47.86 N

Therefore, the magnetic force on the wire is 47.86 N, in the direction perpendicular to both the magnetic field and the wire.

*IG:whis.sama_ent

The statement "two degrees Celsius of global warming is an important threshold because once the Earth crosses this threshold, the impacts of climate change abruptly become more dangerous." is true.

The 2°C threshold is significant because it represents a tipping point at which the effects of climate change become increasingly severe and potentially irreversible. This includes more intense and frequent extreme weather events, higher sea levels, and widespread ecological disruptions.

Crossing the threshold also increases the risk of activating feedback loops, which could accelerate warming further and intensify climate impacts. This concept was agreed upon by scientists and policymakers in the 2009 Copenhagen Accord as a limit to prevent dangerous climate change.

Therefore, it is crucial to take action to mitigate greenhouse gas emissions and prevent global temperatures from surpassing this critical threshold.

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The two sorts of collisions that marbles can experience are elastic collisions and inelastic collisions. Both the kinetic energy and the momentum of the objects colliding are conserved in an elastic collision.

The two marbles collided in an elastic manner in the preceding illustration. The second marble received all of the kinetic energy from the first marble.

Momentum is preserved in a collision, as stated by Newton's third law of motion. That implies that what is put in must come out. For this reason, only one marble exits the stack when you hit one into the stack. The pace remains unchanged.

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The rocket acceleration at time t2 = 2.0 s equals -12.5 m/s2. Noting the negative sign, it should be noted that the rocket is currently decelerating (slowing down).

We can use the following equation to get the acceleration at each time because we know the rocket's velocity at times t0, t1, and t2 from section (e):

a = (v2 - v1) / (t2 - t1)

where the speeds at intervals t1 and t2, respectively, are denoted by v1 and v2.

The rocket's velocity is v0 = 0.0 m/s at time t0 = 0.0 s, hence the aforementioned equation cannot be used to get the acceleration. However, we can get the acceleration at those points by using the beginning velocity and ultimate velocity at t1 = 1.0 s and t2 = 2.0 s, respectively.

At t1 = 1.0 s:

v1 = 10.0 m/s

v2 = 25.0 m/s

The formula for an is: a = (v2 - v1) / (t2 - t1) = (25.0 m/s - 10.0 m/s) / (2.0 s - 1.0 s) = 15.0 m/s2.

Consequently, the rocket accelerates at a rate of 15.0 m/s2 at time t1 = 1.0 s.

At t2 = 2.0 s:

v1 = 25.0 m/s

v2 = 0.0 m/s

t1 = 2.0 s t2 = 4.0 s

a = (v2 - v1)/(t2 - t1) = (0.0 - 25.0 m/s)/(4.0 - 2.0 s) = -12.5 m/s2

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To compute the values of resistance rh and voltage drop vh across the rheostat, we can use the formula V = IR. Here, V is the voltage drop across the rheostat, I is the current flowing through the rheostat (which is the same as the ammeter reading of 0.056A), and R is the resistance of the rheostat (which we want to find).

So, we have V = IR, or Vh = I * rh. Substituting the given values, we get Vh = 0.056 * rh.

We also know that the total voltage across the circuit is 5.0V (given by vt), and the voltmeter reads a voltage drop of 1.69V across the rest of the circuit (i.e., not across the rheostat). So, the voltage drop across the rheostat is vt - vs = 5.0 - 1.69 = 3.31V.

Now we can use Ohm's law (V = IR) again to find the resistance of the rheostat: rh = Vh / I = 3.31 / 0.056 = 59.11 ohms.

Therefore, the value of resistance rh across the rheostat is 59.11 ohms, and the voltage drop vh across the rheostat is 0.056 * 59.11 = 3.31V.

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The expression for q(t) is q(t) = exp(cet - dtrct + C₁), in terms of e, r, t, and c.

To integrate both sides of the equation dq(t)q(t) - ce = -dtrc and obtain an expression for q(t) in terms of e, r, t, and c, follow these steps,

1. Rewrite the equation as: (dq(t)/q(t)) - (ce) = -dtrc
2. Integrate both sides with respect to t:
  ∫[(1/q(t))dq(t) - ce dt] = ∫[-dtrc dt]
3. Perform the integration:
  ln|q(t)| - cet = -dtrct + C₁ (where C₁ is the constant of integration)
4. Isolate ln|q(t)|:
  ln|q(t)| = cet - dtrct + C₁
5. Take the exponential of both sides to solve for q(t):
  q(t) = exp(cet - dtrct + C₁)

In terms of e, r, t, and c, the expression for q(t) is therefore q(t) = exp(cet - dtrct + C1).

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European Homes Rms Voltage Available From A Wall Socketis 240 V. The Maximum Voltage is 339.4V.

In many European homes, the RMS voltage available from a wall socket is 240V.The maximum voltage, or peak voltage, can be calculated using the formula V_peak = V_RMS ×√2.

                                                                                          =240×√2

                                                                                           =339.4V

The breakdown voltage of the junction, or the voltage at which the junction operates, determines the maximum collector voltage required to maintain the collector-base junction's reverse bias.

In a bipolar junction transistor (BJT), the collector-base junction functions as a switch to permit or disallow current flow between the collector and base terminals. The voltage across the collector-base junction must stay below the junction's breakdown voltage in order to retain the reverse bias arrangement. The greatest voltage that the junction can withstand under reverse bias before switching to forward bias and allowing current to flow is known as the breakdown voltage, sometimes known as the peak inverse voltage (PIV).

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a. Therefore, we have: ΔEint = 2P3(V1 - 2V3).

b. Q = ΔEint = (4/5)nCv(T2 - T3) = (4/5)nR(T2 - T3).

c. Therefore, we have: ΔT = T1 - T3 = (P1V1 - P3V3)/nR = (2P3V1 - P3V3)/nR = P3(V1 - V3)/nR and Q = ΔEint + W = nCv(T1 - T3) + 2P3(V1 - V3)

d. In step two of the process, the diatomic gas expands isobarically from volume V1 to volume V2, then cools isochronally from V2 to V3.

a. The work done in process 1-2 is given by:

W = P1(V2 - V1)

Since P1 = 2P3 and V2 = 2V3, we have:

W = 2P3(2V3 - V1)

The change in internal energy in process 1-2 is given by:

ΔEint = Q - W

Q = P1(V2 - V1) = 2P3(2V3 - V1)

b) In process 2-3, the gas is undergoing an isochoric heating from volume V3 to volume V2, followed by an isobaric compression from volume V2 to volume V1.

The work done in process 2-3 is zero since the volume is constant.

The change in internal energy in process 2-3 is given by:

ΔEint = Q - W

Since the process is isochoric, the heat transfer Q is given by:

Q = ΔEint = nCvΔT = nCv(T2 - T3)

PV = nRT

For a diatomic gas, we have:

Cv = (5/2)R/2 = (5/4)R

Substituting for P and V, we have:

Cv(T2 - T3) = (5/4)nR(T2 - T3) = (5/4)ΔEint

Therefore, we have:

Q = ΔEint = (4/5)nCv(T2 - T3) = (4/5)nR(T2 - T3)

c) In process 3-1, the gas is undergoing an isobaric compression from volume V3 to volume V1, followed by an isochoric heating from volume V1 to volume V2.

The work done in process 3-1 is given by:

W = P1(V1 - V3) = 2P3(V1 - V3)

The change in internal energy in process 3-1 is given by:

ΔEint = Q - W

Process is isochoric, the heat transfer Q is given by:

Q = ΔEint = nCvΔT = nCv(T1 - T3)

ΔT = T1 - T3

From the ideal gas law, we have:

PV = nRT

Substituting for P and V, we have:

T = PV/nR

Therefore, we have:

ΔT = T1 - T3 = (P1V1 - P3V3)/nR = (2P3V1 - P3V3)/nR = P3(V1 - V3)/nR

Q = ΔEint + W = nCv(T1 - T3) + 2P3(V1 - V3)

d) The efficiency of the cycle is given by:

η = (Wnet / QH) x 100%

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It would take 96.32 seconds (or just over 1.5 minutes) to move Avogadro's number of electrons at a current of 1000 A.

To calculate the time it takes to move Avogadro's number of electrons at a current of 1000 A, we first need to determine the charge of a single electron. The charge of an electron is approximately 1.6 × 10^-19 coulombs.

Avogadro's number of electrons is 6.02 × 10^23. Therefore, the total charge of Avogadro's number of electrons is:

6.02 × 10^23 electrons x 1.6 × 10^-19 coulombs/electron = 9.632 × 10^4 coulombs

We know that the batteries of the submarine supply a current of 1000 A, which means they provide a charge of 1000 coulombs per second. Therefore, the time it takes to move the charge of Avogadro's number of electrons at this current is:

Time = Total Charge / Current
Time = 9.632 × 10^4 coulombs / 1000 A
Time = 96.32 seconds

So it would take 96.32 seconds (or just over 1.5 minutes) to move Avogadro's number of electrons at a current of 1000 A.

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Current goes up one leg and back down the other  leg experiences is 0.15 A

Given the potential difference (V) between the person's feet is 300 V and the sum of the skin resistance on both legs (R) is 1.0 kΩ, we can calculate the current (I) using Ohm's Law: V = IR.

I (the amount of current flowing through a conductor) = V (the potential difference applied to the ends) divided by R (resistance) is the formula for Ohm's law.
Rearrange the formula to solve for I: I = V/R.
Plug in the given values: I = 300 V / 1,000 Ω.
The current flowing through the person's legs is 0.3 A (amperes). Since the current goes up one leg and back down the other, each leg experiences half of the total current. Therefore, each leg experiences 0.15 A.

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The total resistance of this circuit is 15Ω and the total power of the circuit is 60W.

The power is the ratio of the square of voltage and resistance. The total resistance is obtained from the addition of series and parallel resistance.

From the given,

Total resistance (Requ) = R₁ + R₂

R₁ is a series resistance

R₂ is the parallel resistance

R₂ = 1/15 Ω + 1/10 Ω

   = 10×15 / (15+10)

  = 150 / 25

 = 6Ω

Parallel resistance R₂ = 6Ω

R(equivalent) = R₁ + R₂

                      = 9 + 6

                      = 15Ω

Thus, the total resistance is 15 Ω.

The total power, P = E² / R(equivalent)

E represents the voltage

R(equivalent) is the equivalent resistance

P = 30×30 / 15

  = 60 watts.

Thus, the total power in the circuit is 60 watts.

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Introduction:

In physics and mathematics, vectors are quantities that have both magnitude and direction. Adding vectors is an essential operation in vector algebra, and there are different methods to achieve it. One of the most popular ways of adding vectors is the parallelogram method, which involves constructing a parallelogram using the vectors as adjacent sides and then finding the diagonal of the parallelogram.

Body:

The parallelogram method is a geometric method of adding vectors. It works on the principle that if two vectors are represented by adjacent sides of a parallelogram, then their sum is represented by the diagonal of the parallelogram. To use this method, draw two vectors as adjacent sides of a parallelogram, and then draw the diagonal from the initial point of the two vectors to the opposite corner of the parallelogram. The length and direction of the diagonal represent the magnitude and direction of the sum of the two vectors, respectively.

Conclusion:

The parallelogram method is an intuitive and straightforward way of adding vectors. It is particularly useful when dealing with two-dimensional vectors as it requires only basic geometric knowledge. However, it is not the most efficient method, especially when dealing with many vectors in three dimensions. Other methods, such as the component method, may be more appropriate in such cases. Nonetheless, the parallelogram method remains an essential tool in the study of vectors and provides a useful visualization of vector addition.

In mathematics and physics, a vector is a mathematical object that has both magnitude and direction. Geometrically, a vector can be represented as an arrow with a specified length and direction. Vectors are used to represent quantities that have both size and direction, such as velocity, force, and displacement.

They can be added, subtracted, and multiplied by scalar quantities (e.g., numbers) to produce new vectors that represent the resulting magnitude and direction. Vectors play a fundamental role in many areas of mathematics and physics, including calculus, linear algebra, mechanics, and electromagnetism, among others.

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Momentum is the product of an object's mass and velocity.

Both cars will exert the same force on each other during a collision, assuming they have equal mass and velocity.
The sign of force probe A is reversed in Activity 1-1 because it is measuring the force exerted by the car on the probe, rather than the force exerted by the probe on the car. By convention, forces exerted by an object are considered positive and forces exerted on an object are considered negative. When the truck is accelerating is that the truck will exert a larger force on the car, since it is the larger and more massive object. The car will still exert a force on the truck, but it will be smaller in comparison. The collision in Activity 2-1 is considered "inelastic" because some of the kinetic energy of the objects is lost during the collision, usually in the form of heat or deformation. This means that the objects may stick together or bounce off each other with less velocity than they had before the collision. In contrast, an "elastic" collision would result in the objects bouncing off each other with the same velocity and kinetic energy as before the collision.

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the child's speed at the bottom of the arc is approximately 2.94 m/s.

To determine the speed (v1) of the child at the bottom of the arc, we'll use the conservation of mechanical energy principle. The initial potential energy at the highest point of the swing will convert into kinetic energy at the lowest point of the arc.
Step 1: Calculate the initial height (h) above the lowest point of the arc
h = L - L*cos(angle) = 3m - 3m*cos(45°) = 3m - 3m*(√2/2) = 3m(1 - √2/2)
Step 2: Calculate the initial potential energy (PE) at the highest point
PE = m*g*h = 20kg * 9.81m/s² * 3m(1 - √2/2)
Step 3: At the lowest point, the kinetic energy (KE) equals the initial potential energy (PE)
KE = 0.5*m*v1² = PE
0.5*20kg*v1² = 20kg * 9.81m/s² * 3m(1 - √2/2)
Step 4: Solve for v1
v1² = 2 * 9.81m/s² * 3m(1 - √2/2)
v1 = √[2 * 9.81m/s² * 3m(1 - √2/2)]
v1 ≈ 2.94 m/s (using two significant figures)
So, the child's speed at the bottom of the arc is approximately 2.94 m/s.

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the child's speed at the bottom of the arc is approximately 2.94 m/s.

To determine the speed (v1) of the child at the bottom of the arc, we'll use the conservation of mechanical energy principle. The initial potential energy at the highest point of the swing will convert into kinetic energy at the lowest point of the arc.
Step 1: Calculate the initial height (h) above the lowest point of the arc
h = L - L*cos(angle) = 3m - 3m*cos(45°) = 3m - 3m*(√2/2) = 3m(1 - √2/2)
Step 2: Calculate the initial potential energy (PE) at the highest point
PE = m*g*h = 20kg * 9.81m/s² * 3m(1 - √2/2)
Step 3: At the lowest point, the kinetic energy (KE) equals the initial potential energy (PE)
KE = 0.5*m*v1² = PE
0.5*20kg*v1² = 20kg * 9.81m/s² * 3m(1 - √2/2)
Step 4: Solve for v1
v1² = 2 * 9.81m/s² * 3m(1 - √2/2)
v1 = √[2 * 9.81m/s² * 3m(1 - √2/2)]
v1 ≈ 2.94 m/s (using two significant figures)
So, the child's speed at the bottom of the arc is approximately 2.94 m/s.

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As a result, when viewed from below, the induced current in the loop is clockwise for angles between 0° and 180° and counterclockwise for angles between 180° and 360°.

The magnetic flux through the loop shifts in the direction indicated by the arrow as the loop revolves counterclockwise. Lenz's law states that the magnetic field created by the loop's generated current will resist this change in flux.

When seen from below, the induced current will flow counterclockwise over the range of angles from 0° to 180°. When viewed from below, the induced current will be counterclockwise over the 180° to 360° range of angles. This is owing to the fact that the magnetic flux has changed due to rotation and is now rotating clockwise.

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Correct Question:

A circular loop rotates at a constant speed about an axle through the center of the loop. The figure below shows an edge view and defines the angle o, which increases from 0° to 360° as the loop rotates. There is a uniform, background magnetic field. For what range of angles of o is the induced current in the loop clockwise when viewed from below? For what range of angles of o is the induced current in the loop counterclockwise when viewed from below?

At high elevation, the atmospheric pressure decreases as the air becomes less dense.

As the balloon rises higher, the pressure of the helium gas inside the balloon remains constant, while the pressure of the surrounding air decreases.

At some point, the pressure differential becomes too great for the balloon to withstand, and it will burst or pop.

This is because the balloon's material is only able to hold a certain amount of pressure before it becomes too much to handle and ruptures.

Additionally, the decrease in atmospheric pressure can cause the helium gas to expand, further increasing the pressure inside the balloon and potentially causing it to burst.

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(a) To find the intensity 8.0 m from the source, we can use the formula:

Intensity = Power / (4πr^2)

where r is the distance from the source. Plugging in the values, we get:

Intensity = 125 / (4π x 8^2)
Intensity = 0.061 W/m^2

(b) To find the intensity level in decibels (dB), we can use the formula:

Intensity level (dB) = 10 log10 (I/I0)

where I is the intensity of the sound wave and I0 is the reference intensity, which is 1 x 10^-12 W/m^2. Plugging in the values, we get:

Intensity level (dB) = 10 log10 (0.061/1 x 10^-12)
Intensity level (dB) = 104.6 dB

(c) To find the distance at which the sound would be at the threshold of pain (120 dB), we can rearrange the formula from part (b) to solve for the distance:

distance = sqrt(Power / (4π x I0 x 10^(IL/10)))

where IL is the intensity level in dB (which is 120 dB) and all other variables are the same as before. Plugging in the values, we get:

distance = sqrt(125 / (4π x 1 x 10^-12 x 10^(120/10)))
distance = 0.038 m or 3.8 cm

Therefore, at a distance of 3.8 cm from the loudspeaker, the sound would be at the threshold of pain.

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The free body-diagram for the block would show the force of gravity acting downwards on the block surface, which would be represented by an arrow pointing downwards with a size relative to the magnitude of the force.

There would also be a normal force acting upwards on the block, which would be represented by an arrow pointing upwards with a size relative to the magnitude of the force. Additionally, there would be a force of friction acting in the opposite direction of the applied force, which would be represented by an arrow pointing to the left with a size relative to the magnitude of the force. The force of the string pulling on the block would also be represented by an arrow pointing to the right with a size relative to the magnitude of the force.
The magnitudes of the forces would be balanced since the block is at rest and not moving. Therefore, the force of the string pulling on the block would be equal in magnitude and opposite in direction to the force of friction acting on the block. Similarly, the force of gravity acting downwards on the block would be equal in magnitude and opposite in direction to the normal force acting upwards on the block surface.

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It takes approximately 2.67 ns for light to travel 0.800 meters in a vacuum.

Hi! To determine how long it takes light to travel 0.800 meters in a vacuum, we'll use the formula:

time = distance / speed of light

The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s). First, we'll convert the speed of light to meters per nanosecond (m/ns):

1 m/s = 1 × 10⁻⁹ m/ns
299,792,458 m/s × (1 × 10⁻⁹ m/ns) = 0.299792458 m/ns

Now, we can calculate the time it takes light to travel 0.800 meters in a vacuum:

time = 0.800 m / 0.299792458 m/ns = 2.6682107 ns

So, it takes approximately 2.67 ns for light to travel 0.800 meters in a vacuum.

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Volume of water per kilogram is 0.55 L

To find the volume of water per kilogram, we first need to find the total volume of water in the woman's body. We know that 55% of her weight is water, so:
Total water volume = 0.55 x 60 kg = 33 L
Next, we need to subtract the volume of ethanol from the total water volume to find the volume of water per kilogram:
Ethanol volume = 60 g ÷ 0.789 g/mL = 75.96 mL = 0.07596 L
Total water volume - ethanol volume = 33 L - 0.07596 L = 32.924 L
Now we can divide the total water volume by the woman's weight to find the volume of water per kilogram:
Volume of water per kilogram = 32.924 L ÷ 60 kg = 0.548 L/kg
So the answer is A) 0.55 L/kg, rounded to the nearest hundredth.

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The magnitude of the charge q = 2.80 x 10^-8 C

To determine q, we can use the equation for potential:

V = kq/r

where V is the potential, k is Coulomb's constant (9 x 10^9 N*m^2/C^2), q is the charge, and r is the distance from the point charge to the equipotential surface.

Since we are given the potential and area of the equipotential surface, we can calculate the distance from the point charge to the surface using the formula for the area of a sphere:

A = 4πr^2

Solving for r, we get:

r = √(A/4π) = √(2/4π) = 0.564 m

Now we can substitute the given values into the equation for potential and solve for q:

V = kq/r

447 = (9 x 10^9)(q)/(0.564)

q = (447)(0.564)/(9 x 10^9) = 2.80 x 10^-8 C

Therefore, the charge q of the point charge is 2.80 x 10^-8 C

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Answer: 90Kg

Explanation:

The mass of air hitting the sail each second can be calculated as:

mass of air = density of air * volume of air

The volume of air hitting the sail can be calculated as:

volume of air = area of sail * velocity of wind * time

Here, the area of sail is given as 3.8 m², the velocity of wind is 20 ms^-1, and the time is 1 second (since we want to calculate the mass of air hitting the sail each second).

Therefore,

volume of air = 3.8 m² * 20 ms^-1 * 1 s = 76 m³

Using the given density of air of 1.2 kg m^-3, we can calculate the mass of air hitting the sail each second as:

mass of air = 1.2 kg m^-3 * 76 m³ = 91.2 kg

Therefore, the mass of air hitting the sail each second is approximately 90 kg.

The torque by the fire extinguisher about the center of the seesaw is 150 N-m. This torque causes a counterclockwise rotation of the seesaw.

To find the torque by the fire extinguisher about the center of the seesaw, we need to use the formula for torque, which is given by torque = force x lever arm.

Here, the force acting on the seesaw is the weight of the fire extinguisher, which is given by 10 kg x 10 m/s² = 100 N. The lever arm is the distance from the center of the seesaw to where the force is applied.

Since the fire extinguisher is at the end of one side of the seesaw, the lever arm is half the length of the seesaw, or 1.5 meters. Thus, the torque is given by torque = 100 N x 1.5 m = 150 N-m.

Therefore, the torque by the fire extinguisher about the center of the seesaw is 150 N-m.

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The specific heat of the substance is 0.804 J/g*K.

To solve for the specific heat of the substance, we can use the formula:

q = mCΔT

where q is the amount of heat absorbed, m is the mass of the substance, C is the specific heat of the substance, and ΔT is the change in temperature.

Plugging in the given values:

q = 2593 J
m = 38.33 g
ΔT = 167.2 - 29.2 = 138 K

Solving for C:

C = q / (mΔT)
C = 2593 J / (38.33 g * 138 K)
C = 0.804 J/g*K
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The force law for a central-force field will be F= -kr^2dO/dt

To find the force law for a central-force field that allows a particle to move in a spiral orbit given by r = ku^2, we need to first understand what a central force is. A central force is a force that acts on a particle in such a way that it always points towards a fixed point in space, called the center of force. In other words, the force is radial in nature and depends only on the distance between the particle and the center of force.

Now, since the particle is moving in a spiral orbit, we can assume that there is a component of the force that is perpendicular to the radial direction. This component of the force is responsible for causing the particle to move in a spiral path rather than a circular one.

We can express the force law for this central-force field in terms of the distance r between the particle and the center of force, and the angle θ between the particle's position vector and a fixed reference direction. The force law can be written as:

F = -kr^2 dθ/dt

where k is a constant that depends on the strength of the force, and dθ/dt is the angular velocity of the particle.

This force law ensures that the force acting on the particle is always directed towards the center of force, and that the particle moves in a spiral orbit given by r = ku^2.

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To solve the problem, we first need to find the net force acting on the sled, which is the sum of the forces parallel and perpendicular to the incline. The force of gravity can be resolved into a component parallel to the incline and a component perpendicular to the incline.

The component parallel to the incline causes the sled to slide down, while the component perpendicular to the incline balances the normal force from the incline. The force of kinetic friction acts parallel to the incline and opposes the motion of the sled. We can use the equation F = ma to find the acceleration of the sled up the incline, and then use the kinematic equations to find how far up the incline the sled travels and what its speed is when it returns to its starting point.

We also need to consider the condition for the sled not to get stuck at some point on the incline. This condition is that the coefficient of static friction between the sled and the incline must be greater than or equal to the tangent of the angle of the incline. If the coefficient of static friction is less than the tangent of the angle, then the force of kinetic friction will be greater than the force of static friction and the sled will slide back down the incline.

a) The first step is to find the net force acting on the sled. The forces acting on the sled are its weight mg, the normal force N perpendicular to the incline, and the force of kinetic friction f k parallel to the incline. The component of the weight parallel to the incline is mg sin(28°), so the net force is:

Fnet = mg sin(28°) - f k

where

f k = μk N

and

N = mg cos(28°)

Substituting in the values gives:

Fnet = mg sin(28°) - μk mg cos(28°)

The acceleration of the sled is:

a = Fnet / m

Substituting the values and solving for acceleration:

a = (16 kg)(9.8 m/s^2) sin(28°) - (0.25)(16 kg)(9.8 m/s^2) cos(28°) / 16 kg

a = 1.37 m/s^2

Now we can use the kinematic equation:

vf^2 = vi^2 + 2ad

where

vi = 2.0 m/s (initial velocity)

vf = 0 (final velocity, since the sled stops at some point)

a = 1.37 m/s^2 (acceleration)

d = distance up the incline (what we want to solve for)

Solving for d:

d = (vf^2 - vi^2) / (2a)

d = (0 - (2.0 m/s)^2) / (2(-1.37 m/s^2) sin(28°))

d = 2.8 m

So the sled travels 2.8 meters up the incline.

b) In order for the sled not to get stuck at the point determined in part a, the coefficient of static friction must be greater than or equal to the ratio of the net force perpendicular to the incline to the normal force. This ratio is:

Fnet,perpendicular / N = mg cos(28°) / mg sin(28°) = tan(28°)

So the coefficient of static friction must be:

μs ≥ tan(28°)

c) If the sled slides back down the incline, we can use the same kinematic equation as before, but this time the initial velocity is 0 and the final velocity is what we want to solve for. The acceleration is still the same, so:

vf^2 = vi^2 + 2ad

vf^2 = 2(1.37 m/s^2)(2.8 m)

vf = 2.6 m/s

So the sled's speed when it returns to its starting point is 2.6 m/s.

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