Please help, I'm taking a test mlnkhjbgvfgcfgvhb


What is the motion of the particles in this kind of wave?

A) The particles will move up and down over large areas.

B) The particles will move up and down over small areas.

C) The particles will move side to side over small areas.

D) The particles will move side to side over large areas.

Answer:

Because the hot tea is hot from a microwave or coffee machine when iced tea is cold from ice in the tea.

Explanation:

The error propagation equation for δk (the kinetic energy) is:

δk = √((1/4v^4) * δm² + m²v² * δv²).

To derive the error propagation equation for δk (the kinetic energy), we first need to understand what error propagation is.

Error propagation is a method used to estimate the uncertainty of a quantity that is derived from several other measured quantities that have uncertainties. In other words, it is a way to determine how the errors of the input quantities affect the error of the output quantity.

Now let's derive the error propagation equation for δk (the kinetic energy):

The kinetic energy (k) of an object can be calculated using the following equation:

k = 1/2mv^2

Where m is the mass of the object and v is its velocity.

We can use the standard error propagation formula to find the uncertainty in k.

This formula is given as:

δk = √((∂k/∂m)² * δm² + (∂k/∂v)² * δv²)

where δm and δv are the uncertainties in the measured values of m and v, respectively.

To find ∂k/∂m and ∂k/∂v, we need to take the partial derivatives of k with respect to m and v.

∂k/∂m = 1/2v²

∂k/∂v = mv

Now we can substitute these values in the error propagation equation:

δk = √((1/2v²)² * δm² + (mv)² * δv²)

Therefore, the error propagation equation for δk (the kinetic energy) is:

δk = √((1/4v^4) * δm² + m²v² * δv²)

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Answer:

It's often called the law of inertia. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). ... A more massive object has a greater tendency to resist changes in its state of motion.

Explanation:

Answer: It's often called the law of inertia. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). ... A more massive object has a greater tendency to resist changes in its state of motion.

HOPE THIS HELPS

Hence, 1309 cycles of the engine are needed to accomplish this task.

Given values:

Work done = Force × Distance moved = mgh,

Force = mg = 375 × 9.8 = 3675 N,

Distance moved, s = 27 m

Rate of work = Power = Work done ÷ time

Rate of work = Fs/t

rate of work = 3675 × 0.0525

rate of work = 193.69 W.

Potential energy = Work done = mgh = 375 × 9.8 × 27 = 98175 J.

Heat ejected by the engine per cycle = 75 J, Heat input to the engine per cycle = 115 J.

We can find the number of cycles of the engine needed to accomplish this task by dividing the potential energy by the amount of heat ejected per cycle.

Therefore: Number of cycles = Potential energy ÷ Heat ejected per cycle= 98175 ÷ 75 = 1309 cycles.

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The electric and magnetic field amplitudes of an electromagnetic wave can be calculated using the power output of the source and the distance from the source. We can use the formula:

P = (1/2)ε₀cE₀²A,

where P is the power output, ε₀ is the permittivity of free space (8.854x10⁻¹² C²/(N·m²)), c is the speed of light (3x10⁸ m/s), E₀ is the electric field amplitude, and A is the surface area of a sphere with radius R.

First, let's calculate the surface area of the sphere at a distance of 15.0 m:

A = 4πR² = 4π(15.0 m)² ≈ 2827.43 m².

Now, rearranging the formula, we can solve for E₀:

E₀² = (2P) / (ε₀cA) = (2 * 960 W) / (8.854x10⁻¹² C²/(N·m²) * 3x10⁸ m/s * 2827.43 m²).

Calculating this expression gives us E₀² ≈ 8.76x10⁻⁶ N²/C².

Taking the square root, we find:

E₀ ≈ 9.36x10⁻⁴ N/C.

Finally, we can use the relationship between the electric and magnetic field amplitudes in an electromagnetic wave:

B₀ = E₀ / c,

where B₀ is the magnetic field amplitude.

Substituting the values, we get:

B₀ ≈ (9.36x10⁻⁴ N/C) / (3x10⁸ m/s) ≈ 3.12x10⁻¹² T.

Therefore, the electric field amplitude at a distance of 15.0 m from the source is approximately 9.36x10⁻⁴ N/C, and the magnetic field amplitude is approximately 3.12x10⁻¹² T.

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If a buffer solution is 0.210 m in a weak acid and 0.470 m in its conjugate base. The pH of the buffer solution is approximately 4.53.

To determine the pH of a buffer solution, we can use the Henderson-Hasselbalch equation, which is given by

pH = pKa + log ([A-] / [HA])

Where:

pH is the logarithmic measure of the hydrogen ion concentration in the solution.

pKa is the negative logarithm of the acid dissociation constant (Ka) of the weak acid.

[A-] is the concentration of the conjugate base.

[HA] is the concentration of the weak acid.

In this case, the concentration of the weak acid ([HA]) is 0.210 M, and the concentration of the conjugate base ([A-]) is 0.470 M. The acid dissociation constant (Ka) is given as 6.7 × [tex]10^{-5}[/tex].

First, let's calculate the pKa

pKa = -log(Ka) = -log(6.7 × [tex]10^{-5}[/tex]) = 4.18

Next, substitute the given values into the Henderson-Hasselbalch equation:

pH = 4.18 + log(0.470 / 0.210) = 4.18 + log(2.238) = 4.18 + 0.35

pH = 4.53

Therefore, the pH of the buffer solution is 4.53.

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A hydrogen atom in the n=4 state decays to the n=1 state. The wavelength of the photon that the hydrogen atom emits is 97.2 nm.

To calculate the wavelength of the photon emitted when a hydrogen atom transitions from the n=4 state to the n=1 state, we can use the Rydberg formula:

1/λ = R * (1/n₁² - 1/n₂²)

Where:

λ is the wavelength of the photon

R is the Rydberg constant for hydrogen (approximately 1.097 x 10⁷ m⁻¹)

n₁ is the initial energy level (n=4)

n₂ is the final energy level (n=1)

1/λ = 1.097 x 10⁷ m⁻¹ * (1/16 - 1)

1/λ = 1.097 x 10⁷ m⁻¹ * (-15/16)

λ = -0.972×10⁷ m⁻¹

Since wavelength cannot be negative, we take the absolute value

λ ≈ 97.2 nm.

Therefore, the wavelength of the photon emitted by the hydrogen atom is approximately 97.2 nm.

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The temperature of the hotter star ([tex]T_h[/tex]) is equal to the square root of the surface temperature of the cooler star (T), and the ratio of the peak-intensity wavelengths is proportional to the inverse cube of the temperature ratio.

Part A: Let's denote the temperature of the hotter star as [tex]T_h[/tex]. According to the Stefan-Boltzmann law, the total energy radiated by a blackbody is proportional to the fourth power of its temperature. Since both stars radiate the same total energy per second, we can write:

[tex]T_h^4 = T^4[/tex]

Taking the fourth root of both sides, we get:

[tex]T_h = T^{(\frac {1}{4})}[/tex]

Part B: The peak intensity wavelength (λmax) of a blackbody radiation is inversely proportional to its temperature.

According to Wien's displacement law, we can express the ratio of peak-intensity wavelengths ([tex]\lambda_{max, hot}/ \lambda_{max, cool}[/tex]) as the ratio of their temperatures:

[tex]\frac{\lambda_{max, hot}}{ \lambda_{max, cool}} = \frac{T_h}{T}[/tex]

Substituting the relationship we derived in Part A, we have:

[tex]\frac{\lambda_{max, hot}}{ \lambda_{max, cool}} = \frac{T^{\frac{1}{4}} }{T}[/tex]

Simplifying, we get:

[tex]\frac{\lambda_{max, hot}}{ \lambda_{max, cool}} = T^{\frac{-3}{4}} }[/tex]

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The distance between the two 100 kg persons needs to be approximately 8.17 x 10^-4 meters (or 0.817 mm) in order for the force they exert on each other to be equal to 1 N.

To calculate the distance between two 100 kg persons so that the force they exert on each other is equal to 1 N, we can use Newton's law of universal gravitation.

The formula for gravitational force (F) between two objects is:

F = (G * m1 * m2) / r^2

where G is the gravitational constant (approximately 6.672 x 10^-11 N·m^2/kg^2), m1 and m2 are the masses of the objects, and r is the distance between the centers of the objects.

In this case, we want the force to be 1 N, and both persons have a mass of 100 kg. Substituting these values into the formula, we get:

1 N = (6.672 x 10^-11 N·m^2/kg^2 * 100 kg * 100 kg) / r^2

Simplifying the equation:

1 N = (6.672 x 10^-7 N·m^2) / r^2

Rearranging the equation to solve for the distance (r):

r^2 = (6.672 x 10^-7 N·m^2) / 1 N

r^2 = 6.672 x 10^-7 m^2

Taking the square root of both sides:

r ≈ 8.17 x 10^-4 m

Therefore, the distance between the two 100 kg persons needs to be approximately 8.17 x 10^-4 meters (or 0.817 mm) in order for the force they exert on each other to be equal to 1 N. Option B, 6.672 x 10^-7 m, appears to be a typographical error as it corresponds to the value of the gravitational constant rather than the distance.

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Answer:

will mostly accord at the top of the boiling water my kind sir

Explanation:

Evaporation takes place only at the surface of a liquid, whereas boiling may occur throughout the liquid. In boiling, the change of state takes place at any point in the liquid where bubbles form. The bubbles then rise and break at the surface of the liquid.

The statement is true. When one projects an object vertically upward from the ground, that object will reach a maximum height h before it is brought back down to earth by the force of gravity.

The laws of motion, more especially the principles of projectile motion, are the ones that rule over this behaviour. When the object is propelled forward, its initial velocity works against the gravitational pull, causing it to slow down until it reaches its highest point. This continues until the object has reached its highest position. After reaching this point, the object's velocity stops being positive and it begins a free fall towards the ground as a result of the force of gravity.

The initial velocity of the object, the angle at which it is launched, and the force of gravity all play a role in determining the maximum height h that it is possible to reach. Kinematic equations can be used to determine the answer to this question. It is essential to keep in mind, however, that the maximum height will also be determined by any external forces that are operating on the object, such as the resistance posed by the air.

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The magnetic flux if the magnetic field vector is b=(-20 t)i (10 t)k and the area vector is a=(-50 m2)j (8 m2) k is 1000 t j + 80 t k.

The magnetic flux is calculated as follows:

[tex]\phi = \vec{B} \cdot \vec{A}[/tex]

where  

B is the magnetic field vector,  

A is the area vector, and ϕ is the magnetic flux.

In this case, we have:

[tex]\vec{B} = (-20 t)i + (10 t)k[/tex]

and

[tex]\vec{A} = (-50 m^2)j + (8 m^2) k[/tex]

Substituting these values into the equation for magnetic flux, we get:

[tex]\begin{aligned}\phi &= (-20 t)i + (10 t)k \cdot (-50 m^2)j + (8 m^2) k \\&= -20 t \cdot (-50 m^2)j + 10 t \cdot 8 m^2 k \\&= 1000 t j + 80 t k\end{aligned}[/tex]

Therefore, the magnetic flux is a vector with a magnitude of 1000t and a direction of j+k. Note that the magnetic flux is a scalar quantity, so the vector notation is only used to indicate the direction of the flux.

The magnetic flux can also be calculated as follows:

[tex]\phi = \int_A \vec{B} \cdot d\vec{S}[/tex]

where A is the area of the surface, and d

S is a small element of surface area. In this case, the area of the surface is a rectangle with dimensions 50×8 meters. The magnetic field is uniform, so we can calculate the magnetic flux as follows:

[tex]\begin{aligned}\phi &= \int_A \vec{B} \cdot d\vec{S} \\&= \int_{-50}^{50} \int_{-8}^8 (-20 t)i + (10 t)k \cdot dx dy \\&= \int_{-50}^{50} (-20 t) \cdot dy + \int_{-8}^8 (10 t) \cdot dx \\&= 1000 t j + 80 t k\end{aligned}[/tex]

The answer is: 1000 t j + 80 t k

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Answer: D all of the above

Explanation: Coal, Graphite, Diamond are all allotropes of Carbon. Hope this helps :)

To make the red light appear green, you would need to be traveling at a speed of approximately 2.727×10⁸ m/s.

The color of light is determined by its wavelength. Red light has a longer wavelength than green light, with the given values of 650 nm and 550 nm, respectively.

The frequency of light is inversely proportional to its wavelength, so we can use the formula:

frequency = speed of light / wavelength

Given that the speed of light is 3×10⁸ m/s, we can calculate the frequencies of red and green light:

Frequency of red light = (3×10⁸ m/s) / (650×10⁻⁹ m) = 4.615×10¹⁴ s⁻¹

Frequency of green light = (3×10⁸ m/s) / (550×10⁻⁹ m) = 5.455×10¹⁴ s⁻¹

To perceive the red light as green, we need to match the frequencies. Since the speed of light remains constant, we can equate the two frequencies:

(3×10⁸ m/s) / (λ_red) = (3×10⁸ m/s) / (λ_green)

Simplifying the equation, we find:

λ_red = λ_green

From this, we can determine the speed required to make the red light appear green:

v = (λ_red - λ_green) / λ_green = (650×10⁻⁹ m - 550×10⁻⁹ m) / 550×10⁻⁹ m = 100×10⁻⁹ m / 550×10⁻⁹ m

v ≈ 2.727×10⁸ m/s

Therefore, in order for the red light to appear green, you would need to be moving at a velocity of approximately 2.727×10⁸ m/s.

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Answer:

liquids and gases

Explanation:

Liquids and gases are considered to be fluids because they yield to shearing forces, whereas solids resist them.

Answer:

d=v1t - .5at^2

d=4.88 x .872 - 0.5 x (4.88/0.872) x 0.872^2

d=4.255 - 2.12

d= 2.135m

Explanation:

acceleration is negative because she is slowing down.

To determine the proton's speed when it reaches the negative plate, we can utilize the relationship between electric field, force, and acceleration.

The force experienced by a charged particle in an electric field is given by the equation F = qE, where F is the force, q is the charge of the particle, and E is the electric field strength. In this case, the proton has a charge of +e (1.6 × 10⁻¹⁹ C) and experiences a force in the direction of the electric field.

Using Newton's second law, F = ma, we can relate the force to the proton's acceleration (a) and mass (m). Since the proton is released from rest, its initial velocity (v₀) is zero. The distance traveled by the proton (d) is equal to the spacing of the parallel plates, which is 2.30 mm (2.30 × 10⁻³ m).

The force on the proton is F = qE = (1.6 × 10⁻¹⁹ C) × (5.50×10⁴ N/C) = 8.80 × 10⁻¹⁵ N. By equating the force to mass times acceleration, we have ma = 8.80 × 10⁻¹⁵ N.

Rearranging the equation to solve for acceleration, we get a = (8.80 × 10⁻¹⁵ N) / (m). The mass of a proton is approximately 1.67 × 10⁻²⁷ kg.

Substituting the values, we find the acceleration of the proton. Using the kinematic equation v² = v₀² + 2ad, we can find the final velocity (v) of the proton when it reaches the negative plate.

Since the initial velocity (v₀) is zero and the distance (d) is known, we can solve for the final velocity. Calculating the expression gives us the speed of the proton when it reaches the negative plate.

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The gauge pressure that someone would measure for the can of soda located at sea level is 2.0 atm.

Gauge pressure is the pressure measured relative to atmospheric pressure. At sea level, the atmospheric pressure is approximately 1.0 atm. To find the gauge pressure, we subtract the atmospheric pressure from the internal absolute pressure.

Gauge pressure = Internal absolute pressure - Atmospheric pressure

Given that the internal absolute pressure is 3.0 atm and the atmospheric pressure is 1.0 atm, we can substitute these values into the equation:

Gauge pressure = 3.0 atm - 1.0 atm = 2.0 atm

If the can of soda is located at sea level, someone would measure a gauge pressure of 2.0 atm. Gauge pressure represents the pressure above or below atmospheric pressure, and in this case, the can has an internal pressure that is 2.0 atm higher than the atmospheric pressure at sea level.

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a) The work function of the metal is 2.00 eV.

b) When the photon energy is adjusted to 6.10 eV, the maximum kinetic energy of the photoelectrons will be 4.10 eV.

a) The work function (Φ) of the metal can be determined by subtracting the maximum kinetic energy (KEmax) of the photoelectrons from the energy of the incident photons (Ephoton).

Given:

The energy of incident photons (Ephoton) = 4.00 eV

The maximum kinetic energy of photoelectrons (KEmax) = 2.00 eV

To find the work function (Φ):

Φ = Ephoton - KEmax

Φ = 4.00 eV - 2.00 eV

Φ = 2.00 eV

Therefore, the work function of the metal is 2.00 eV.

b) To calculate the maximum kinetic energy of photoelectrons when the photon energy is adjusted to 6.10 eV, we use the same formula as in part (a).

Given:

The energy of incident photons (Ephoton) = 6.10 eV

To find the maximum kinetic energy of photoelectrons (KEmax):

KEmax = Ephoton - Φ

Using the previously determined work function (Φ) of 2.00 eV:

KEmax = 6.10 eV - 2.00 eV

KEmax = 4.10 eV

Therefore, when the photon energy is adjusted to 6.10 eV, the maximum kinetic energy of the photoelectrons will be 4.10 eV.

a) The work function of the metal is 2.00 eV.

b) When the photon energy is adjusted to 6.10 eV, the maximum kinetic energy of the photoelectrons will be 4.10 eV.

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The minimum possible coefficient of static friction between bike tires and the ground is zero. This means that there is no requirement for static friction to exist in order for the bike to remain stationary or in motion.

Static friction is the force that prevents two surfaces from sliding against each other when there is no relative motion between them. It depends on the nature of the surfaces in contact and the force pressing them together. In the case of bike tires and the ground, the coefficient of static friction measures the ratio of the maximum static frictional force to the normal force between the tire and the ground.

If the coefficient of static friction were zero, it would imply that there is no need for static friction to keep the bike tires from slipping. This situation can occur when the surfaces are extremely smooth or when other forces, such as rolling resistance or air resistance, provide enough stability to maintain traction.

However, it's important to note that a zero coefficient of static friction can also indicate a lack of friction altogether, which could make it impossible for the bike tires to maintain contact with the ground and result in sliding or loss of control.

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The electron drift speed in the iron wire is approximately 4.49 mm/s. When electrons are subjected to an electric field they do move randomly, but they slowly drift in one direction, in the direction of the electric field applied. The net velocity at which these electrons drift is known as drift velocity.

The formula to calculate the electron drift speed is:

v_d = I / (n * A * q)

Where:

- v_d is the electron drift speed

- I is the electric current

- n is the number density of charge carriers (electrons)

- A is the cross-sectional area of the wire

- q is the charge of an electron

Given:

- I = 2.00 × 10^20 electrons

- Diameter of the wire = 3.20 mm

- Time = 4.50 s

First, we need to calculate the current (I) in Amperes:

I = (2.00 × 10^20 electrons) / (4.50 s)

I ≈ 4.44 × 10^19 A

Next, we need to determine the cross-sectional area (A) of the wire. The wire is cylindrical in shape, so we can use the formula for the area of a circle:

A = π * (diameter/2)^2

A = π * (3.20 mm/2)^2

A ≈ 8.03 mm^2

Converting the cross-sectional area to square meters:

A = 8.03 mm^2 * (1 m^2 / 1000 mm^2)

A ≈ 8.03 × 10^-6 m^2

The number density of charge carriers (n) is given by the ratio of the number of electrons (I) to the volume of the wire. Since we don't have the volume, we cannot calculate the exact number density. However, for a wire, the number density is typically on the order of 10^28 to 10^29 electrons per cubic meter.

Lastly, we know that the charge of an electron (q) is approximately 1.6 × 10^-19 C.

Using the formula for electron drift speed, we can calculate:

v_d = (4.44 × 10^19 A) / (10^28 electrons/m^3 * 8.03 × 10^-6 m^2 * 1.6 × 10^-19 C)

v_d ≈ 4.49 mm/s

Therefore, the electron drift speed in the iron wire is approximately 4.49 mm/s.

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Answer:

Hereeeeeeeeeeeeeeeeeee

Answer:

im still in elementry so you got to do it yo self

Explanation:

so me confused

Answer:

Log burning in a fire. Burning wood is an example of a chemical reaction in which wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapor, and ash.

Explanation:

The estimated length of the refracting telescope is approximately 412.8 cm.

The magnification (M) of a telescope is given by the formula: M = focal length of the objective lens / focal length of the eyepiece. In this case, the magnification is 85, and the focal length of the eyepiece is 4.8 cm.

Rearranging the formula, we can find the focal length of the objective lens:

focal length of the objective lens = M × focal length of the eyepiece = 85 × 4.8 cm = 408 cm.

Now, to estimate the length of the telescope, we need to consider the formula for the total length of a refracting telescope:

total length = focal length of the objective lens + focal length of the eyepiece.

Substituting the values, we have:

total length = 408 cm + 4.8 cm = 412.8 cm.

Please note that the actual length of a refracting telescope depends on various factors, such as the design, focal lengths, and positioning of the lenses, which may differ from the assumptions made in this response.

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Answer:C

Explanation:I think sorry if it’s wrong

A light ray can change direction when going from one material to another. That phenomenon is known as refraction.

The phenomenon you are referring to is known as refraction. Refraction occurs when a light ray transitions from one medium to another, causing a change in its direction.

This change in direction is a result of the difference in the speed of light between the two media. When light passes through a medium with a different optical density or refractive index, it experiences a change in speed, causing the light ray to bend or deviate from its original path.

Refraction can be observed in various everyday situations. For example, when light travels from air into water or glass, it undergoes refraction.

The bending of light at the interface between these media is responsible for phenomena like the apparent shift in position of objects submerged in water, the bending of a pencil when placed in a glass of water, or the formation of rainbows.

The amount of bending that occurs during refraction depends on the angle at which the light ray enters the interface and the refractive indices of the two media involved.

Snell's law, which describes the relationship between the incident angle, the refracted angle, and the refractive indices, governs the behavior of light during refraction.

Refraction plays a crucial role in various optical devices, including lenses, prisms, and fiber optics. Understanding and controlling the phenomenon of refraction is essential in fields such as optics, physics, and engineering, enabling the development of technologies and applications that rely on manipulating light for imaging, communication, and scientific research.

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Answer: for insulation of heat

Explanation:

Windows in cold countries have double glazing windows to provide a barrier against the outside temperature by creating a buffer zone between two glasses.

The air or any other gas-filled between the glasses act as an insulator and offer great resistance to outside temperature thereby maintaining the inside temperature intact.

Answer:

The kinetic energy of the baseball is 306.25 joules.

Explanation:

SInce the baseball can be considered a particle, that is, that effects from geometry can be neglected, the kinetic energy ([tex]K[/tex]), in joules, is entirely translational, whose formula is:

[tex]K = \frac{1}{2}\cdot m\cdot v^{2}[/tex] (1)

Where:

[tex]m[/tex] - Mass, in kilograms.

[tex]v[/tex] - Speed, in meters per second.

If we know that [tex]m = 0.5\,kg[/tex] and [tex]v = 35\,\frac{m}{s}[/tex], then the kinetic energy of the baseball thrown by the player is:

[tex]K = \frac{1}{2}\cdot m \cdot v^{2}[/tex]

[tex]K = 306.25\,J[/tex]

The kinetic energy of the baseball is 306.25 joules.