a rifle is used to shoot twice at a target, using identical car- tridges. the first time, the rifle is aimed parallel to the ground and di rectly at the center of the bull's-eye. the bullet strikes the target at a distance of ha below the center, however. the second time, the rifle is similarly aimed, but from twice the distance from the target. this time the bullet strikes the target at a distance of hp below the center. find the ratio hp/ha.

Answer:

Efficiency = 20%

Explanation:

Given the following data;

Input energy = 1000 Joules

Output energy = 200 Joules

To find the efficiency of the solar cell;

\( Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100 \)

Substituting into the formula, we have;

\( Efficiency = \frac {200}{1000} * 100 \)

\( Efficiency = 0.2 * 100 \)

Efficiency = 20%

Answer:

The pressure value changes 400 % relative to the initial value.

Explanation:

Let suppose that the gas behaves ideally and represents a closed system, that is, a system with no mass interactions so that number of moles is conserved (\(n\)). Since the variables involved in the isothermal process are pressure (\(P\)) and volume (\(V\)). Finally, the process is represented by the following relationship:

\(P_{1}\cdot V_{1} = P_{2}\cdot V_{2}\) (1)

Where:

\(P_{1}, P_{2}\) - Initial and final pressures.

\(V_{1}, V_{2}\) - Initial and final volumes.

If we know that \(P_{1} = P_{o}\), \(V_{1} = V_{o}\) and \(V_{2} = 0.2\cdot V_{o}\), then the final pressure of the closed system is:

\(P_{2} = P_{1}\cdot \left(\frac{V_{1}}{V_{2}} \right)\)

\(P_{2} = 5\cdot P_{o}\)

The pressure value changes 400 % relative to the initial value.

The speed of water in the constriction is faster when compared to the rest of the pipe.

The venturi effect consists of a physical phenomenon applied in fluid dynamics in which the pressure of flow decreases when there is a constraint in the conduct, accompanied by an increase in velocity of the fluid due to a decrease in cross-sectional area of the conduct.

The constriction is said to have a lower radius when compared to the rest of the pipe.

Applying the equation of continuity, A₁ v₁ = A₂ v₂

where, A is the area

v is the velocity

It is said from the above equation that, if area decreases velocity increases and if area increases velocity decreases, as velocity and area are inversely proportional to each other.

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Adam's uncertainty about whether he will be thanked or criticized for helping cook dinner relates to his behavior-outcome expectancies.

Behavior-outcome expectancies refer to a person's beliefs about the outcomes or consequences that are likely to follow from their actions. In this scenario, Adam is uncertain about the potential outcomes of his behavior, specifically whether he will be thanked or criticized for helping cook dinner. In this case, Adam's uncertainty specifically revolves around his behavior-outcome expectancies (D). He is unsure about the potential responses he will receive for his action of helping cook dinner. This uncertainty may stem from factors such as past experiences, social norms, or the specific dynamics and expectations within his household. Adam's uncertainty highlights the importance of understanding and managing behavior-outcome expectancies in interpersonal interactions and decision-making processes.

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Answer: A

Explanation:

A

The Earth’s magnetic field is generated by the B. flow in the liquid outer core.

The core of the Earth is composed of two parts: a solid inner core and a liquid outer core. The outer core is made up of liquid iron and nickel that is in a state of constant motion, this motion is driven by heat from the Earth’s core, and as the liquid metal moves, it creates electrical currents.

These electrical currents, in turn, create a magnetic field around the Earth. The magnetic field protects the Earth from the solar wind, a stream of charged particles that is constantly emitted from the sun. Without the magnetic field, the solar wind would strip away the Earth’s atmosphere and make it impossible for life to exist.

The Earth’s magnetic field is not constant, and it can change over time. It is also subject to occasional reversals, where the north and south magnetic poles switch places. Despite these fluctuations, the magnetic field is a crucial part of the Earth’s environment and has a significant impact on life on our planet. So therefore the correct answer is B. flow in the liquid outer core.

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ANSWER:

Answer:

its a sure for not but i think its a 192583

Answer:

My answer is when the ball is going it experience kinetic energy which is the energy of a moving object while when the ball has stopped then it will have potential energy which means it's at rest so for the ball not to experience friction then there is a gain in kinetic energy and decrease in potential energy.

Answer:

Gain in Kinetic energy and decrease in Potential energy.

Explanation:

The energy possessed to a body due to its motion is called kinetic energy.

K = \(\frac{1}{2} .m.v^{2}\)

The energy possessed to a body due to its position is called potential energy.

\(U =mgh\)

Hence in free fall , the ball experiences gain in kinetic energy and decrease in potential energy.

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Answer:

3 m/s

Explanation:

distance (rise) over time (run) gives speed, that is velocity

it can be found using the gradient (m) formula

m=(y2-y1)/(x2-x1)

m=(15-3)/(4-0) =12/4=3 m/s

Answer:

3 m/s

Explanation:

.....as the answer for your question is 3m/s ..

THANK YOU..

Light oil is poured onto the liquid surface until the top surface of the oil coincides with the top is 7.73 mm.

Calculation:-

s = 12 mm

Pw = 835 kg/m3

Pl = 1296 kg/m3

According to Archimedes principle

Pw s^3 g = Pl h s^2 g

h = s [Pw / Pl]

= 12 mm [835 / 1296]

= 7.73 mm

We assume that the top of the cube is still above the oil's surface. If ha is the width of the oil layer, we have that the buoyant force is

B = (Po s^2 ha + Pl s^2 hw ) g

Once again, the buoyant force must be equal to the weight of the cube.

Archimedes' precept (also spelled Archimedes' principle) states that the upward buoyant pressure that is exerted on a body immersed in a fluid, whether or not absolutely or partially, is equal to the weight of the fluid that the frame displaces. Archimedes' principle is a law of physics essential to fluid mechanics. It turned into formulated by way of Archimedes of Syracuse.

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Explanation:

meters per second  

    meters per second  

         seconds

Hi there!

To solve, we can use a summation of torques.

For the see-saw to balance, the sum of torques must equal 0, so:

∑τ = 0

Recall that:

τ = rFsinθ

r = distance from pivot (meters)

F = force (N)

In this case, the forces are the weight of the children. Also, we can leave the distance in centimeters for this type of problem, but others do require a conversion to meters.

Multiply each mass by 10 (g ≈ 10 m/s²) to get the weight:

Στ = 270(400) - x(300) = 0

270(400) = 300x

Solve for 'x', the distance in cm away from the fulcrum:

108000/300 = 360 cm

When a beam of 11 keV X-rays illuminates a sample, the angles that will produce diffraction maxima of the first, second, and third order can be calculated using Bragg's law, which states that nλ = 2d sin(θ), where n is the order of diffraction, λ is the wavelength of the X-rays, d is the spacing between crystal lattice planes, and θ is the angle of incidence.

Bragg's law can be used to calculate the angles for diffraction maxima. For the first-order maximum (n = 1), we have λ = 2d sin(θ₁). Rearranging the equation, we get sin(θ₁) = λ / (2d). Substituting the values, with λ representing the wavelength of 11 keV X-rays (which can be converted to the corresponding wavelength), and the known spacing between lattice planes, we can solve for θ₁.

For the second-order maximum (n = 2), the equation becomes λ = 2d sin(θ₂). Solving for sin(θ₂) and substituting the values, we can find θ₂.

Similarly, for the third-order maximum (n = 3), we use λ = 2d sin(θ₃) to determine sin(θ₃) and find θ₃ by substituting the values.

By calculating these angles using Bragg's law, we can determine the angles that will produce diffraction maxima of the first, second, and third order for the given beam of 11 keV X-rays illuminating the sample.

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The cannonball lands 12.4 km from the cannon if the cannonball is fired with a velocity of 551 m/s in the cannon is aimed 12° above the ground.

R = u² sin 2θ / g

R = Horizontal range

u = Initial velocity

θ = Angle made with ground

g = Acceleration due to gravity

u = 551 m / s

θ = 12°

g = 9.8 m / s²

R = 551² sin 2 ( 12° ) / 9.8

R = 303601 * 0.4 / 9.8

R = 12392 m

R = 12.4 km

The horizontal range of a projectile is the horizontal distance travelled by the projectile from the point from which it was launched. It is denoted by R.

Therefore, the cannonball lands 12.4 km from the cannon

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This pulse delivers a charge of 18c/s. The total amount of work done during the pulse is 3.6 Joules.

To find the rate at which work is done by the electric organs during the pulse, we can use the formula:
Power = Work / Time
Given that the potential difference is 0.20 kV (0.20 × 10³ V) and the duration of the pulse is 1.5 ms (1.5 × 10⁻³ s), we can calculate the power as:
Power = (Potential Difference × Charge) / Time
Power = (0.20 × 10³ V × 18 C/s) / (1.5 × 10⁻³ s)
Power = 2.4 × 10³ W
Therefore, the rate at which work is done by the electric organs during the pulse is 2.4 × 10³ W.
To find the total amount of work done during the pulse, we can use the formula:
Work = Power × Time
Work = 2.4 × 10^3 W × 1.5 × 10⁻³ s
Work = 3.6 J
Therefore, the total amount of work done during the pulse is 3.6 Joules.

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Start with the atom diameter being as large as possible and interaction strength being as weakas possible.

What size are the force arrows in the middle of the atoms is small.

The atomic diameter is the distance across the nucleus, measured in picometers (pm). The nucleus is at the core of the atom. It consists of protons and neutrons. The electrons circle the nucleus in shells or energy levels, which are shown as circles around the nucleus in atomic models.Atomic radius is a term that is often used synonymously with atomic diameter. The atomic radius is the distance from the center of the nucleus to the outermost shell of electrons, which determines the size of an atom.

The interaction strength refers to how strong the bonds are between atoms. The stronger the interaction, the closer the atoms are, and the harder it is to pull them apart. In comparison, if the interaction is weaker, the atoms are farther apart, and they can be pulled apart more easily. Consequently, if the atom diameter is large and the interaction strength is weak, the size of the force arrows in the middle of the atoms is small.

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The material with the lowest refractive index is air. The correct option is D. Air.

Light waves are a type of electromagnetic wave that travel through space at the speed of light.

In this case, the light wave is traveling through glass and then strikes the boundary with a second medium at a 45° angle, refracting away from the boundary. For the light wave to refract away from the boundary, the second medium must have a lower refractive index than glass.

Out of the options given, the material with the lowest refractive index is air. Therefore, the correct answer is D. Air.

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Answer:

A turbine spins to generate electricity. There are many ways to spin the turbine by using water, steam, nuclear and so on.

Answer:

13.5 m

Explanation:

Given:

v₀ = 0 m/s

v = 9 m/s

a = 3 m/s²

Find: Δx

v² = v₀² + 2aΔx

(9 m/s)² = (0 m/s)² + 2 (3 m/s²) Δx

Δx = 13.5 m

Distance = 10 miles

Displacement = zero

The coach must be fired and disciplined.

Answer:it will take 10 hours

Explanation: The way we get this answer is if the boat travels 200 miles at 20 mph that means that every 20 miles the boat traveled an hour would pass. Using this we can see that 20 fits into 200, 10 times, meaning that the time it would take to travel would be 10 hours.

The time it will take to travel 200 miles is 10 seconds

The calculation can be done as follows

= 200/20

= 10 seconds

Hence the amount of time it will take the speed boat to travel 200 miles is 10 seconds

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Answer:

Having begun as a "science of mental life", psychology evolved in the 1920's into the "scientific study of observable behavior". ... Today's science emphasizes the interaction of genes and experiences in specific environment

Answer:

Psychology continues to develop over the years all the way up to today by new and better scientific like science emphasizes. Also new experiences in specifics enviroment.

Explanation:

Hope it helped :)

Explanation:

since oil needs more boiling time and a higher boiling temperature the oil would have to be in the pot longer than the water if it needs to be boiled longer that is why the blue line for oil temp. is significantly higher than that of the water temp.

The magnitude of the acceleration of each block in terms of the variables f, m, and μ is f / (2m + μm).

To determine the magnitude of the acceleration of each block, we need to consider the forces acting on the system. Let's assume there are two blocks with masses m and m, respectively, in contact with each other. The force applied to the system is f.

The friction force between the blocks can be calculated using the coefficient of friction μ and the normal force between the blocks. Since the blocks are in contact, the normal force between them is equal to the weight of the blocks, which is mg for each block.

The friction force acting on each block is given by f_friction = μ * mg.

The net force acting on each block is the difference between the applied force f and the friction force: net force = f - f_friction.

Using Newton's second law (F = ma), we can equate the net force to the mass m multiplied by the acceleration a. Thus, we have f - μmg = ma.

Solving for acceleration, we get a = (f - μmg) / m.

Since the two blocks are touching and experiencing the same acceleration, the magnitude of the acceleration for each block is given by a = (f - μmg) / m.

In summary, the magnitude of the acceleration of each block, in terms of the variables f, m, and μ, is f / (2m + μm).

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Answer:

1 N/C

Explanation:

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The number and mass concentration for which the particles and the air in a unit volume of aerosol scatter equal amounts of light depend on several factors, including the size and composition of the particles, the wavelength of light, and the refractive index of the particles and air.

In general, the scattering of light by particles in an aerosol is described by Mie theory, which takes into account the size parameter (2πr/λ, where r is the particle radius and λ is the wavelength of light) and the complex refractive index of the particles.

To achieve equal scattering of light by particles and air in a unit volume of aerosol, the number concentration of particles and their size distribution should be such that the scattering cross-section of the particles matches the scattering cross-section of the air molecules. Similarly, the mass concentration of particles should be adjusted to achieve an equal scattering effect.

The specific values of number and mass concentrations required for equal scattering will vary depending on the aforementioned factors and need to be determined through calculations or experimental measurements for a particular aerosol system.

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The radius of  the magnet is 0.4337 m and the the cyclotron frequency is \(1.436*10^8 Hz\).

(a) To calculate the radius of the magnet, we can use the equation r = mv/qB, where m is the mass of the proton, v is the velocity of the proton, q is the charge of the proton, and B is the magnetic field.

Solving for r, we get r = mv/qB = \((18*10^6 eV/c^2)(3*10^8 m/s)/(1.602*10^{-19} C)(1.3 T)\) = 0.4337 m.
(b) To calculate the cyclotron frequency, we can use the equation f = qB/2πm, where f is the frequency, q is the charge of the proton, B is the magnetic field, and m is the mass of the proton.

Solving for f, we get f = qB/2πm = \((1.602*10^{-19} C)(1.3 T)/(2\pi )(1.672*10^{-27} kg)\) = 1.436x10^8 Hz.

Therefore, the cyclotron frequency is \(1.436*10^8 Hz\).

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Answer:

A

Explanation:

speed=1.5*6.0

=9.0m/s

The speed of the wave is 9 m/s. So, the correct option is A.

Frequency of a wave is defined as the number of oscillations completed by the wave in one second.

Here,

Wavelength of the wave, λ = 1.5 m

Frequency of the wave, f = 6 Hz

We know that, the equation for the speed of the wave is given as,

v = fλ

v = 6 x 1.5

v = 9 m/s

Hence,

The speed of the wave is 9 m/s.

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