A block of wood is floating in a pool of water. One third of the block is above the surface of the water. Discuss the buoyant force that is acting on the log. Is the buoyant force greater than, less than or equal to the weight of the block? Explain your answer. Is the volume of water displaces by the block greater than, less than or equal to the volume of the block? Explain your answer after watching the following video.

As you move from the positive plate to the negative plate in the gap of a parallel plate capacitor, the electric field is directed from the positive plate to the negative plate. The electric field lines are parallel and uniform between the plates.

This is because the positive plate creates a positive electric field pointing away from it, while the negative plate creates a negative electric field pointing towards it. The net result is a uniform electric field directed from positive to negative.

The magnitude of the electric field remains constant throughout the gap between the plates, assuming there are no external influences or variations. This uniform electric field distribution is a characteristic of a parallel plate capacitor and is essential for its functioning in storing electric charge.

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The radii r₁, r₂, and r₃ of the nuclei 4,2He, 236,92U, and 56,26Fe are  1.9044 x 10⁻¹⁵ meters, 4.3944 x 10⁻⁵ meters, 4.3944 x 10⁻¹⁵ meters.

The radii of atomic nuclei can be estimated using the empirical formula known as the "constant density model." According to this model, the radius (r) of a nucleus can be approximated using the equation:

r = r0 A¹/³

where r0 is a constant and A is the mass number of the nucleus.

The value of r0 is typically taken to be around 1.2 fm (femtometers) or 1.2 x 10⁻¹⁵ meters.

For the nucleus 4,2He (helium-4):

A = 4

r0 = 1.2 fm

r1 = 1.2 fm × 4¹/³

≈ 1.2 fm × 1.587

≈ 1.9044 fm

≈ 1.9044 x 10⁻¹⁵ meters

Therefore, r1 = 1.9044 x 10⁻¹⁵ meters.

For the nucleus 236,92U (uranium-236):

A = 236

r0 = 1.2 fm

r2 = 1.2 fm × 236¹/³

≈ 1.2 fm × 6.118

≈ 7.3416 fm

≈ 7.3416 x 10⁻¹⁵ meters

Therefore, r2 = 7.3416 x 10⁻¹⁵ meters.

For the nucleus 56,26Fe (iron-56):

A = 56

r0 = 1.2 fm

r3 = 1.2 fm × 56¹/³

≈ 1.2 fm × 3.662

≈ 4.3944 fm

≈ 4.3944 x 10⁻¹⁵ meters

Therefore, r3 = 4.3944 x 10⁻¹⁵ meters.

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Answer:

180N

Explanation:

the gravity on Earth is six times the one on the moon

Answer:

I think 180N

Explanation:

the gravity of the surface of the earth is 6Times

more than the moon

The speed at which the ball left the quarterback's hand was approximately 69.93 mph.

To calculate the speed at which the ball left the quarterback's hand, we can use the kinematic equation for projectile motion. Assuming the pass was thrown at a 45-degree angle, the initial vertical velocity (V₀y) would be equal to the initial horizontal velocity (V₀x) since the angle is symmetrical. We can break down the motion into horizontal and vertical components.

Given that the pass traveled 83 yards (249 feet) in the air, we can use the equation for horizontal distance to find the initial horizontal velocity:

Distance = V₀x * time,

249 ft = V₀x * time.

Since the time of flight is the same for the horizontal and vertical components, we can express time as:

time = distance / V₀x,

time = 249 ft / V₀x.

For the vertical motion, the equation for vertical displacement is:

Displacement = V₀y * time + 0.5 * g * time²,

0 ft = V₀y * time - 16 ft/s² * time².

Since the vertical displacement is zero (the ball returns to the same height), we can solve for time:

0 = V₀y - 16 ft/s² * time,

V₀y = 16 ft/s² * time.

Now we can substitute the expression for time from the horizontal motion into the vertical motion equation:

V₀y = 16 ft/s² * (249 ft / V₀x),

V₀y = 3984 ft/s² / V₀x.

Since V₀y = V₀x, we can equate the two expressions for V₀y:

V₀x = 3984 ft/s² / V₀x,

V₀x² = 3984 ft/s²,

V₀x = √(3984 ft/s²).

To convert the velocity to mph, we multiply by the conversion factor:

V₀x = √(3984 ft/s²) * (3600 s/h) / (5280 ft/mi),

V₀x = √(3984 * 3600) / 5280 mph,

V₀x ≈ 69.93 mph.

Therefore, the speed at which the ball left the quarterback's hand was approximately 69.93 mph.

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The example of functional fixedness is: B) Natasha doesn't think of using her CD case as an ice scraper to clear her windshield.

The example of functional fixedness is: B) Natasha doesn't think of using her CD case as an ice scraper to clear her windshield. Functional fixedness refers to a cognitive bias where an individual is unable to see alternative uses or functions for an object beyond its typical or intended purpose. In this case, Natasha is unable to think of using her CD case as an ice scraper, indicating functional fixedness.

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18.22 kg/mol is the molar mass of the gene fragment if a bacterial gene fragment of 10.0 mg is dissolved in enough water to make 30.0 ml of solution.

What is a solution?

In a homogenous mixture of two or more components, a solution is defined as having particles less than one nanometer in size. Solutions come in many forms, such as sugar and salt solutions, soda water, etc. In a solution, each element appears as a separate phase.

The ratio between the mass and the amount of a chemical compound's constituents is known as the compound's molar mass. A substance's molar mass is a bulk attribute rather than a molecular one.

π = cRT

c = n/V

n = w/m = 10*10^-3 /[m*30*10^-3]M

m = RT/383.14 = 18.22 kg/mol

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The energy used for the 30-day period is 1,355,000 kJ, the average energy used is 45,166.67 kJ/day, and the electric bill for this month would be approximately $101.41.

To find the energy used for the 30-day period in kJ: a) Energy Used (kJ) = 1355 kWh * 1000 Wh/kWh = 1,355,000 Wh = 1,355,000 kJ

To find the average energy used in J/day: b) Average Energy Used (J/day) = Energy Used (kJ) / 30 days

Average Energy Used (J/day) = 1,355,000 kJ / 30 days = 45,166.67 kJ/day

To calculate the electric bill for this month: c) Electric Bill = Energy Used (kWh) * Cost per kWh Electric Bill = 1355 kWh * $0.0749/kWh = $101.4145. Therefore, your electric bill for this month would be approximately $101.41.

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Answer:

T=502.5N

Ax=171.8N

Explanation:

The computation of the tension T in the rope and the forces exerted by the pin at A is shown below:

vertical forces sum = Ay + Tsin20 + T - 245 - 883 = 0

Now  

horizontal forces sum = Ax - Tcos70

Now Moment about B

-Ay × 4.8 + 245 × 2.4 + 883 × 1.8=0

Ay=453.6N

Now substitute in sum of vertical forces T=502.5N

Ax=171.8N

a. The tension (T) in the rope is equal to 502.51 Newton.

b. The forces exerted by the pin at A is equal to 171.86 Newton.

Given the following data:

To calculate the tension (T) in the rope and the forces exerted by the pin at A:

First of all, we would determine the vertical force by taking moment about point B as shown in the diagram.

[tex]-A_y \times 4.8 + 883 \times 1.8 + 245 \times 2.4 =0\\\\-4.8A_y + 1589.4 + 588 =0\\\\4.8A_y= 3237\\\\A_y=\frac{2177.4}{4.8} \\\\A_y= 453.63 \;Netwon[/tex]

The tension (T) in the rope would be calculated by the sum of the vertical component of forces, which is given by:

[tex]\sum F_x = A_y + Tsin20 + T - 245 - 883 = 0\\\\453.63 + 0.3420T + T -1128=0\\\\1.3420T = 1128-453.63\\\\1.3420T =674.37\\\\T =\frac{674.37}{1.3420}[/tex]

Tension, T = 502.51 Newton.

To find the forces exerted by the pin at A, we sum the vertical component of forces, which is given by:

[tex]\sum F_y = A_x - Tcos70 =0\\\\A_x =Tcos70\\\\A_x = 502.51 \times cos70\\\\A_x = 502.51 \times 0.3420\\\\A_x = 171.86\;Newton[/tex]

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To determine the angular radius of the rings observed in a Michelson interferometer, we can use the formula: Angular radius = λ / (2πd)

where λ is the wavelength of light and d is the path difference. a) For the first (smallest diameter) ring: λ = 632.8 nm = 632.8 × 10^(-9) m. d = 20 μm = 20 × 10^(-6) m. Angular radius = (632.8 × 10^(-9)) / (2π × 20 × 10^(-6)). b) For the tenth ring, the path difference would be 10 times larger than for the first ring, so the new path difference would be: d' = 10 × d = 10 × 20 × 10^(-6) m. Angular radius = (632.8 × 10^(-9)) / (2π × 10 × 20 × 10^(-6)) By calculating these expressions, you can find the values for the angular radii of the first and tenth rings observed in the Michelson interferometer using the given wavelength and path difference.

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Kinetic energy is the energy possessed by a body as a result of its motion. Therefore, the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s is 104,640.625 J which is closest to option A, i.e., 127,575 J.

It is calculated by multiplying half of the mass of a body with the square of its velocity. The kinetic energy formula can be written as, KE = (1/2)mv2Where,KE is the kinetic energy of the body, m is the mass of the body, v is the velocity of the body. Now, let us apply the above formula to find the kinetic energy of the given roller coaster car whose mass is 625 kg and speed is 18.3 m/s.KE = (1/2)mv2KE = (1/2) x 625 x (18.3)2KE = (1/2) x 625 x 334.89KE = 104,640.625 J.

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The kinetic energy (KE) of the emitted photoelectrons in the Sodium surface will be: lower compared to the KE of the photoelectrons in the Potassium surface.

The work function of a material is the minimum amount of energy required to remove an electron from its surface. If the work function of Sodium is greater than that of Potassium, it means that Sodium requires more energy to remove electrons compared to Potassium.

When photons of the same wavelength are incident on both surfaces, the energy of the photons is given by E = hf, where h is Planck's constant and f is the frequency of the photons (related to the wavelength).

For the photoelectric effect to occur, the energy of the incident photons must exceed the work function of the material. Since Sodium has a higher work function than Potassium, it will require photons with higher energy to exceed its work function and emit photoelectrons.

Therefore, the photons incident on the Sodium surface, despite having the same wavelength as those incident on the Potassium surface, will have lower energy. As a result, the kinetic energy of the emitted photoelectrons in the Sodium surface will be lower compared to the kinetic energy of the photoelectrons in the Potassium surface.

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The electric field vector produced by the applied stress, assuming the electric displacement is held equal to zero, is X V/m.

In a piezoelectric material, the relationship between stress (σ) and electric field (E) is given by the piezoelectric coefficient (d) multiplied by the stress tensor (T). The electric field vector can be calculated using the equation E = d * T.In this case, we are given the stress values applied in different directions: 3 MPa in the direction of polarization and 5 MPa in the two directions normal to the polarization vector. To calculate the electric field, we need the piezoelectric coefficient for the specific material, APC850. Once we have the value of d, we can substitute the stress tensor values into the equation to determine the electric field vector.However, without the specific piezoelectric coefficient for APC850, I'm unable to provide an exact numerical value for the electric field. It is crucial to have the material's specific piezoelectric coefficient to perform the calculation accurately.

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The value of resistance R must be 7.77 x 10⁴ Ω to give a percent decrease in angular frequency of 5.0% compared to the value calculated in part A.

In part A,

the angular frequency is ω = 3.3 x 10⁵ rad/s.

To find the value of resistance R to give a 5.0% decrease in angular frequency, the following formula is used,

ω' = ω (1 - δ)

where

ω is the original angular frequency,

ω' is the new angular frequency,

δ is the percentage decrease.

Substituting the given values,

ω' = 3.3 x 10⁵ rad/s (1 - 5.0/100)

ω' = 3.135 x 10⁵ rad/s

Now we can use the formula for angular frequency to calculate the value of resistance R as follows:

ω = 1/√(LC - R²)

R = √(LC - ω'²)

R = √((0.420 H)(2.50 x 10⁻⁵ F) - (3.135 x 10⁵ rad/s)²)

R = 7.77 x 10⁴ Ω

Therefore, the value of resistance R must be 7.77 x 10⁴ Ω to give a percent decrease in angular frequency of 5.0% compared to the value calculated in part A.

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Answer:

v₂ = 16 m/s

Explanation:

We can use the continuity equation, which is as follows:

[tex]A_1v_1 = A_2v_2\\[/tex]

where,

A₁ = Area of inlet = πd²/4

A₂ = Area of outlet = π(d/2)²/4 = πd²/16

v₁ = velocity at inlet = 4 m/s

v₂ = velocity at outlet = ?

Therefore,

[tex](\frac{\pi d^2}{4})(4\ m/s)=(\frac{\pi d^2}{16})v_2\\\\[/tex]

v₂ = 16 m/s

Alpha Centauri, the star closest to the sun, is located 4.3 light years away. Alpha Centauri and Earth are separated by around 4.1 × 10¹⁶ meters.

To convert the distance of 4.3 light-years (ly) to meters, we can use the conversion factor of 1 light-year equal to 9.461 × 10¹⁵ meters. Multiplying 4.3 by this conversion factor gives us the distance in meters:

4.3 ly * 9.461 × 10¹⁵ meters/ly = 4.0853 × 10¹⁶ meters

Rounding to two significant figures, the distance to Alpha Centauri is approximately 4.1 × 10¹⁶ meters. This distance represents the vast scale of interstellar distances.

Alpha Centauri is the closest star system to our solar system, yet its distance is still incredibly immense. Understanding these astronomical distances helps us appreciate the vastness of the universe and the challenges involved in space exploration and interstellar travel.

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Int he abve image relating to rock cycle, A = Igneous Rock

B = Metamorphic Rock

C = Sedimentary Rock.

The rock cycle is a continuous process that describes the transformation of rocks through various geological processes. It involves the formation, breakdown, and reformation of three main types of rocks

The cycle starts with the formation of igneous rocks through the solidification of molten magma or lava. These rocks can then be weathered and eroded into sediments,which are compacted and cemented to form   sedimentary rocks.

Under intense heat and pressure,these rocks can undergo metamorphism, resulting in   the formation of metamorphic rocks.

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When ^227_89Ac undergoes alpha decay, the resulting nucleus is ^223_87Fr, with a decrease of 2 protons and 4 nucleons compared to Ac.

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which consists of two protons and two neutrons (equivalent to a helium nucleus). This process reduces the atomic number of the parent nucleus by 2 and its mass number by 4, resulting in the formation of a new nucleus. Alpha decay occurs in heavy, unstable nuclei to achieve greater stability by reducing their size and releasing excess energy.

When ^227_89Ac undergoes alpha decay, it emits an alpha particle, which consists of 2 protons and 2 neutrons. This means the resulting nucleus will have 2 fewer protons and 2 fewer neutrons compared to Ac.

Ac has an atomic number of 89, so after alpha decay, the resulting nucleus will have an atomic number of 89 - 2 = 87.

Ac has a mass number of 227, so the resulting nucleus will have a mass number of 227 - 4 = 223.

Therefore, the resulting nucleus is ^223_87Fr.

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Answer:

it goes up until we help it to but the moment we stop support it gets affected by gravity and goes back

Explanation:

Electrical Energy is defined as the amount of work done by an electric current, or by the electrical charges that pass through a given area, as they move between two points that differ in electric potential.

Its unit is Joules (J).The formula for Electrical Energy can be given as:Electrical Energy = Power × Time elapsedE = P × twhere E = Electrical Energy, P = Power, and t = Time elapsed. The resistance of the hairdryer is 9.6 ohms and operates at 120 volts for 2.5 minutes.Power is given by the formula:P = (V²/R)P = (120)² / 9.6P = 1500 Watts = 1500 J/sNow, to calculate the total electrical energy used by the dryer during this time interval, we need to substitute the values of Power and Time elapsed in the formula:

E = P × tE = 1500 × 2.5E = 3750 J

Hence, the correct option is (1) 2.9 × 10³J.Note: In order to get more than 160 words, a detailed explanation is given with formulas, units, and a step-by-step procedure to calculate the Electrical Energy used by the hair dryer.

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Answer:

D

Explanation:

Does not assosicate with Light

The electric field is equal to zero at a point on the line through the ends of the meter stick located between the two charges, specifically between 0 cm and 50 cm.

To determine the point on the line where the electric field is zero, we can use the principle of superposition. The electric field produced by a point charge is given by Coulomb's law:

[tex]\[ E = \frac{{k \cdot |q|}}{{r^2}} \][/tex]

where E is the electric field, k is Coulomb's constant [tex](\(8.99 \times 10^9 \, \text{N}\cdot\text{m}^2/\text{C}^2\)), \(q\)[/tex] is the charge, and r is the distance from the charge.

Considering the positive charge at the 0.0 cm mark, the electric field it produces points away from it. Similarly, the negative charge at the 50.0 cm mark produces an electric field that points towards it.

Between the two charges, there exists a point where the electric field contributions from both charges cancel out, resulting in a net electric field of zero. This point can be determined by setting the electric field equations for the two charges equal to each other and solving for the position:

[tex]\[ \frac{{k \cdot |q_1|}}{{r_1^2}} = \frac{{k \cdot |q_2|}}{{r_2^2}} \][/tex]

Substituting the values [tex]\(q_1 = 5.00 \, \mu\text{C}\), \(r_1 = 0.00 \, \text{cm}\), \(q_2 = -4.00 \, \mu\text{C}\), and \(r_2 = 50.00 \, \text{cm}\)[/tex], we can solve for the position r of the point where the electric field is zero. The solution will yield a value between 0 cm and 50 cm, indicating the location of the point on the line between the two charges where the electric field is zero.

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The angular magnification produced by the reflecting telescope when a 3.05 m focal length eyepiece is used is approximately -1.97.

To calculate the angular magnification produced by a telescope, we can use the formula

Angular Magnification = - (fobjective / feyepiece)

Where:

fobjective is the focal length of the objective mirror

feyepiece is the focal length of the eyepiece

In this case, the objective mirror has a radius of curvature of 12.0 m, so its focal length (fobjective) is half of the radius of curvature:

fobjective = 12.0 m / 2 = 6.0 m

The focal length of the eyepiece is given as 3.05 m (feyepiece).

Substituting the values into the formula:

Angular Magnification = -(6.0 m / 3.05 m)

Angular Magnification = -1.97

Since the angular magnification is negative, it indicates that the image produced by the telescope is inverted.

Therefore, the angular magnification produced by the reflecting telescope when a 3.05 m focal length eyepiece is used is approximately -1.97.

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The turbine generates entropy at a rate of about 2.4944 kW/K. The option that comes closest to the provided values is (c) 3.34 kW/K.

To find the rate of entropy generation in the turbine, we need to apply the concept of entropy balance. The rate of entropy generation can be determined by calculating the difference between the entropy flow into and out of the system.

Given:

Inlet conditions:

Pressure at inlet (P₁) = 0.18 MPa

Mass flow rate (m) = 1.6 kg/s

Exit conditions:

Pressure at exit (P₂) = 1 MPa

Temperature at exit (T₂) = 60 degrees C = 333.15 K

First, we need to determine the specific entropy at the inlet and outlet states. We can use the properties of Refrigerant-134a to find these values.

From the saturation table for Refrigerant-134a at 0.18 MPa (inlet pressure), we can find the corresponding saturation temperature T1.

At P₁ = 0.18 MPa:

Saturation temperature T1 = 20.83 degrees C = 293.98 K

From the superheated table for Refrigerant-134a at 1 MPa (exit pressure) and 60 degrees C (exit temperature), we can find the specific entropy value S2.

At P₂ = 1 MPa, T₂ = 60 degrees C:

Specific entropy S₂ = 1.559 kJ/(kg·K)

The rate of entropy generation in the turbine can be calculated as:

Rate of entropy generation = m * (S₂ - S₁)

Where:

m = mass flow rate

S₂ = Specific entropy at the exit

S₁ = Specific entropy at the inlet

Substituting the values:

Rate of entropy generation = 1.6 kg/s * (1.559 kJ/(kg·K) - 0)

Rate of entropy generation = 1.6 kg/s * 1.559 kJ/(kg·K)

Rate of entropy generation ≈ 2.4944 kW/K

Therefore, the rate of entropy generation in the turbine is approximately 2.4944 kW/K.

Among the given options, the closest one is (c) 3.34 kW/K.

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The correct answer is "Pulley C." In a system of three pulleys, where the girl is hanging from one end and the other end is fixed, the tension in the rope is equal throughout the system.

If a girl weighing 200 newtons hangs from three pulley systems, the reading on all three pulley systems would be 200 newtons. In an ideal pulley system, the tension in the rope is the same throughout, so the force applied to each pulley would be equal to the weight of the girl, which is 200 newtons in this case. The correct answer is "Pulley C." In a system of three pulleys, where the girl is hanging from one end and the other end is fixed, the tension in the rope is equal throughout the system.

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We learn about objects of interest to intelligence through matter/energy interactions such as emission, reflection, refraction, and absorption.

Emission: Objects can emit energy in the form of light, heat, or other types of radiation. By detecting and analyzing the emitted radiation, we can gather information about the object's properties and composition.
Reflection: When light or other forms of energy bounce off an object's surface, we can observe and analyze the reflected radiation. The characteristics of the reflected radiation can provide insights into the object's shape, color, and surface properties.
Refraction: When energy passes through a medium and changes direction, such as when light bends while passing through a transparent object, it undergoes refraction. By studying the changes in the direction and intensity of the refracted energy, we can gain knowledge about the object's composition and structure.
Absorption: Objects can absorb certain types of energy, causing a decrease in its intensity. By examining the absorbed energy and the wavelengths that are absorbed, we can acquire information about the object's chemical composition and properties.
Through these interactions, scientists and researchers employ various instruments and techniques to gather data and learn about objects of interest, enabling us to deepen our understanding and make informed interpretations and analyses.

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The energy required to increase the temperature is 5277.78 J

Here we want to find the heat energy required to raise the temperature of a substance, so we can use the formula:

Q = m * c * ΔT

Where:

In your case, the values are:

m = 37.5 g (mass of water)

c = 4.184 J/g°C (specific heat capacity of water)

ΔT = (55.2°C - 23.0°C) = 32.2°C (change in temperature)

Now, let's substitute these values into the formula:

Q = 37.5 g * 4.184 J/g°C * 32.2°C

Q = 5277.78 J

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