Shown below are two different scenarios of a free water jet impacting onto a vertical object. In scenario a (on the left), the plate is stationary. Determine the water jet velocity b. In scenario b (on the right), the moves to the right with a constant speed of 10 ft/s. Determine the water jet velocity. 3 in. 3 in. FA = 10 lb FA = 10 lb 10 ft/s (a) (b)

(b) the presence of technetium in giant star spectra. Astronomers have direct evidence supporting the formation of heavy elements in stars through the observation of certain elements in their spectra.

Here correct answer is B.

One such element is technetium (Tc), which is not naturally occurring on Earth and has no stable isotopes. The presence of Tc in the spectra of certain types of stars, particularly red giants and Mira variables, is a strong indicator of heavy element nucleosynthesis in stars.

This is because Tc is a radioactive element with a short half-life, so any Tc present in a star's atmosphere must have been produced relatively recently through nuclear reactions within the star itself.

Gamma-ray emissions from cobalt 56 decay in supernovae (a) and observed elemental abundances (c) are also used to support the idea of heavy element formation in stars, but they are not direct evidence.

The light curves of type-I supernovae (d) are used to study the expansion and evolution of these events and are not directly related to heavy element formation in stars. Therefore, the correct answer is (b) the presence of technetium in giant star spectra.

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Answer:

E

Explanation:

Metals (the ones used to make jewelry) are valuable, Resistant to corrosion, and retain their appearance well over long periods of time.

(Pls mark me brainliest)

Metals are often used for making designer jewelry because they have a combination of properties that make them suitable for this purpose. One important property is their ability to be shaped and bent without breaking, which makes them ideal for creating intricate designs.

This property is due to their strength and flexibility, which allows them to be manipulated into various shapes and forms. Additionally, metals are often shiny and can be polished to a high gloss, which adds to their aesthetic appeal. While some metals such as gold and silver are good conductors of electricity, their conductivity is not the primary reason for their use in jewelry making. Similarly, while metals do conduct heat, their thermal conductivity is not a major factor in their use for making jewelry. Therefore, option E, which includes both C and D, is the most appropriate answer.

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Answer:

The level of seed in each feeder

Explanation:

The independent variable is the variable which is the suspected cause of an observation, it is the variable that produce the effect observed in the dependent variable. The dependent variable is the variable that is measured

The independent variable is normally the x-value while the dependent variable is the y-value

In the question, Lana wants to find out the kind of birdseed that the neighborhood birds like (to eat) the most by feeding them different types of birdseed and measuring the level of the birdseed in the feeders at regular intervals

the independent variable is the bird seed types which Lana gives to the birds, to determine the type of bird seeds the birds like

The dependent variable is the level of the seed in the feeder which depends on the type of seeds the birds like.

Answer:

649 N

Explanation:

W = force X distance

2920 = force * 4.5

2920/4.5 = force = 649 N

Answer:

A. primary waves

Explanation:

The box travels 3.33 meters up the ramp with no friction and 1.56 meters with friction.

Frictionless ramp:

K_i = (1/2)mv_i^2 = (1/2)(2 kg)(10 m/s)^2 = 100 J

K_f = 0

U_f = mgh

Since energy is conserved, we have:

K_i = U_f

(1/2)mv_i^2 = mgh

h = (1/2)(v_i^2)/g * sin^2(theta) = (1/2)(10 m/s)^2 / (9.81 m/s^2) * sin^2(37 degrees) = 3.33 m

f_friction = μ_k * f_norm

W_friction = f_friction * d = μ_k * f_norm * d

K_i = U_f + W_friction

(1/2)mv_i^2 = mgh + μ_k * f_norm * d

d = (v_i^2 - 2gh)/(2μ_kf_norm) = ((10 m/s)^2 - 2*(9.81 m/s^2)sin(37 degrees)(3.33 m))/(20.22 kg*cos(37 degrees)*9.81 m/s^2) = 1.56 m

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Answer:

The magnitude of the net electric field is:

\(E_{net}=90.37\: N/c\)

Explanation:

The electric field due to q1 is a vertical positive vector toward q1 (we will call it E1).

On the other hand, the electric field due to q2 is a horizontal positive vector toward q2(We will call it E2).

Knowing this, the magnitude of the net electric field will be the E1 + E2.

Let's find first E1 and E2.

The electric field equation is given by:

\(|E_{1}|=k\frac{|q_{1}|}{d_{1}^{2}}\)

Where:

\(|E_{1}|=(9*10^{9})\frac{|-2.60*10^{-9}|}{0.538^{2}}\)

\(|E_{1}|=80.84\: N/C\)

And E2 will be:

\(|E_{2}|=k\frac{|q_{2}|}{d_{2}{2}}\)

\(|E_{2}|=(9*10^{9})\frac{|-8.30*10^{-9}|}{1.36^{2}}\)

\(|E_{2}|=40.39\: N/C\)

Finally, we need to use the  Pythagoras theorem to find the magnitude of the net electric field.

\(E_{net}=\sqrt{E_{1}^{2}+E_{2}^{2}}\)

\(E_{net}=\sqrt{80.84^{2}+40.39^{2}}\)

\(E_{net}=90.37\: N/c\)

I hope it helps you!

Answer:

+90.3 N/C

Explanation:

acellus

Answer:

First, the thermometer is dipped into boiling water, and the mercury inside the thermometer rises to a high level, called the boiling point. This level is then marked as 100°C. The thermometer is then dipped into melting ice, which causes the mercury level to fall to a point called the ice point. This point is then marked as 0°C. The length of the thermometer from the 0°C mark to the 100°C point is then divided into 100 equal sections, and the rest of the levels are marked accordingly.

750 nm is the predicted wavelength. The distance between two successive crests or troughs of a wave is known as its wavelength. It is measured in the wave's direction.

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. This length is typically defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

= slit separation = 1.8 mm = 0.0018 m

is the monochromatic light's wavelength.

= 4.8 meters from the screen

= first bright fringe's position =

= order = 1

The first bright fringe's position is indicated by

λ = 7.5 x 10⁻⁷ m

λ = 750 nm

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Answer:

a ) Its wavelength decreases

Explanation:

When a ray enters into air from glass slab its wavelength decreases.

Option C, The amount of power produced by the automobile and the horse cannot be established purely based on the facts supplied.

Power may be estimated by dividing the amount of work or energy by the amount of time it takes to perform the work or transfer the energy. Power is defined as the pace at which work is completed or energy is transmitted.

Only the time required for each trip is provided in the issue; no information on the distance traveled, the amount of work completed, or the amount of energy used during each journey is provided. As a result, it is impossible to say whether one generates more power than the other or if their output is equal.

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The question is -

Imani drives her car from point A to point B, the trip takes 1 hour; then rides her horse from point B back to point A, this trip takes 2 hours. Does the car or the horse produce more power?

A. the car

B. the horse

C. No power is involved.

D. Both produce the same amount of power.

As the distance between charged tape and charged rod decreases, the force of interaction between them increases.

The force of interaction between the charged tape and charged rod is governed by Coulomb's Law.

This law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

So, as the distance between the charged tape and charged rod decreases, the force of interaction increases.

This is because the charges on the objects are now closer to each other, allowing for a stronger attraction or repulsion, depending on the nature of the charges (like charges repel, opposite charges attract).

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Answer:True

Explanation:

Answer:

20m

Explanation:

Using the equation s=d/t and re arranging it to solve for distance, d=St, where d=distance, s=speed, ant t=time, we can plug in known variables.

d=4*5

d=20m

there is a distance of 20m traveled

The horizontal distance traveled by the rock is 20 m

For horizontal motion, we use the formula below

⇒ Formula

s = vt.................... equation 1

⇒ Where

From the question,

⇒ Given:

⇒ Substitute these values into equation 1

Hence, The horizontal distance traveled by the rock is 20 m

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Answer:

D. The oxygen side is partially negative because electrons are pulled toward the oxygen side.

Explanation:

The water molecule is polar by the virtue of covalent bonds and the hydrogen bonds within and between its molecule.

The oxygen side is partially negative because the electrons are pulled toward the oxygen side.

Between oxygen and hydrogen that makes up the water molecule, oxygen is more electronegative.

An electronegative atom has more affinity for electrons. Since the electrons in the molecule of water is shared between hydrogen and oxygen, the more electronegative specie which is water draws the electron more to itself.

This leaves a net negative charge on the oxygen atom.

By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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Answer:

When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate

Explanation:

Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force

Newton's second law states that an applied force is equal to the rate of change of momentum it produces

Newton's third law states action and reaction are equal and opposite.

The change in gravitational potential energy is 5.39 J.

Gravitational potential energy is a type of potential energy that an object possesses due to its position in a gravitational field. It is the energy that an object has due to its height and the force of gravity acting upon it. The formula for gravitational potential energy is given by mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above a reference point. When an object falls from a height, it converts its gravitational potential energy into kinetic energy.

To find the change in gravitational potential energy, we can use the formula: ΔU = mgh, where m is the mass of the object (1.0 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the change in height.

The change in height is 0.80 m - 0.25 m = 0.55 m. Plugging in the values, we get:

ΔU = 1.0 kg * 9.8 m/s^2 * 0.55 m = 5.39 J

So the change in gravitational potential energy is 5.39 J.

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The complete question is:

A 1.0kg toy car is released at the top of a frictionless track on the left and rolls off of the track from its right side ramp. The car starts at height of 0.80 m, goes through a 0.50 m diameter loop, and exits the ramp at a height of 0.25 m 0.80 m 0.50 mi 0.25 m What is the change in the car's gravitational potential energy from A to B? Round answer to two significant digits.

Answer:

Group 18

Explanation:

Answer:

gold

Explanation:

gold is shinny and solid can conduct ele tricity ,maleabl

By looking at light from a distant object, you cannot determine its mass.

When observing light from distant objects, such as stars or galaxies, astronomers can determine properties like distance, velocity, temperature, and composition using various techniques like redshift, spectroscopy, and brightness measurements.

However, these methods do not directly provide information about the mass of the object.

By looking at light from a distant object, we cannot determine the exact location of the object due to the possibility of light being bent or redirected by intervening objects.

Summary: Although light from distant objects allows us to determine various properties, it cannot be used to directly determine an object's mass.

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Answer: it’s c

Explanation:

The body's response to a cold involves various immune cells and processes. Here is a simplified flow chart depicting the step-by-step response:

This flow chart demonstrates the coordinated response of B cells, helper T cells, macrophages, mucus production, lymph, cytokines, receptor proteins, antibodies, memory cells, and plasma cells in combating a cold virus and eventually eliminating it from the body.

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The value of the force on particle 1  and particle 2 is -14.41 N.

The value of the force on particle 1 is calculated by applying Colomb's law as follows;

F₁ = (k q₁q₂) / ( r²)

where;

F₁ = (k q₁q₂) / ( r²)

F₁ = (9 x 10⁹  x 13 x 10⁻⁶ x 7.7 x 10⁻⁶) / ( 0.25²)

F₁ = -14.41 N

Thus, the value of the force on particle 1 is determined as -14.41 N.

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The most important factor for convection to occur is heat.

Convection is a method of heat transfer that involves the movement of fluid from hot region to cold region.

Heat transfer processes by convection is dominant in liquids and gases.

Therefore, we can conclude that the most important factor for convection to occur is heat, because the heat must flow from hot region to cold region through fluid movement.

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Answer:

B

Explanation:

a heat source

Answer:

1.86 \(m/s^{2}\)

Explanation:

Acceleration = \(\frac{Force}{mass}\)

Force = 11N

Mass = 5.9 kg

∴ Acceleration = \(\frac{11}{5.9}\)

= 1.86 \(m/s^{2}\)

For a normal distribution with mu = 100 and sigma = 10, we can use the standard normal distribution table to find the percentage of scores that have values less than X = 85.

First, we need to standardize the value of X using the formula: z = (X - mu) / sigma. Plugging in the given values, we get: z = (85 - 100) / 10 = -1.5. Using the standard normal distribution table, we can find the percentage of scores that have z-values less than -1.5. The table gives us the area under the standard normal distribution curve to the left of a given z-value. Since the distribution is symmetric, we can look up the area to the right of -1.5 and then subtract it from 1 to get the area to the left of -1.5. Looking up the area to the right of -1.5 in the standard normal distribution table, we find that it is 0.0668. Therefore, the area to the left of -1.5 is: 1 - 0.0668 = 0.9332. This means that approximately 93.32% of scores have values less than X = 85 in a normal distribution with mu = 100 and sigma = 10. In a negatively skewed distribution of scores, the mean is less than the median, and the tail of the distribution is longer on the left side. If we sample from this distribution, the probability of sampling a z-score less than 1.00 will depend on the specific parameters of the distribution. However, we can make some general observations about the probability of sampling a z-score less than 1.00. Since the distribution is negatively skewed, we know that there are fewer scores on the left side of the distribution than on the right side. This means that the probability of sampling a z-score less than 1.00 will be less than 0.50. To get a more precise answer, we would need to know the specific parameters of the distribution. If we know the mean and standard deviation of the distribution, we can standardize the value of 1.00 using the formula: z = (x - mu) / sigma, where x is the value of interest, mu is the mean of the distribution, and sigma is the standard deviation of the distribution. We can then use the standard normal distribution table to find the probability of sampling a z-score less than the standardized value.

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Answer:

5.6x10^4

Explanation:

use the equation V=kq/d

k is the constant 8.99x10^9

V=(8.99x10^9)q/d

q is the charge, 7.5 micro coulombs, but to get coulombs, multiply by 10^-6

V=(8.99x10^9)(7.5x10^-6)/d

And from the problem, we know that the distance is 1.2 meters

V=(8.99x10^9)(7.5x10^-6)/1.2

This simplifies to 5.6x10^4

The electric potential is 5.6 x 10⁴ v.

To find the electric potential the distance = 1.2 m

Charge q = 7.5 UC

               The amount of work needed to move a unit charge from the known point to some unknown point against the electric field  is said to be electric potential.

Formula of an electric potential is

                                     V = k ( q/r)  volt

                   V - electric potential

                    k - Coulomb constant (8.99x10^9)  

                    q -  charge

                     r- distance of separation

  V = (8.99x10⁹) (q/d)

  q = 7.5 UC ( micro coulomb) 10⁻⁶ C

   V=(8.99x10⁹)(7.5x10⁻⁶)/d

Substituting the values,

    V=(8.99x10⁹)(7.5x10⁻⁶)/1.2

    V = 5.6x10⁴ v

Thus, option A is correct.

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Answer:

89.5 Hz

Explanation:

The relationship between the frequency and the wavelength is given by the following formula:

\(\lambda = \frac{c}{f}\\\\\)

where,

f = frequency

c = speed of light

λ = wavelength

Since the speed of light is constant. Therefore the formula suggests an inverse relationship between the frequency and the wavelength. Hence, the station with the lowest frequency will have the longest wavelength.

Therefore, the answer is:

89.5 Hz

When two waves interfere, the resulting displacement is determined by the principle of superposition, which states that the displacements caused by individual waves add up algebraically at each point of overlap. In the case of constructive interference, the waves are in phase, meaning their peaks and troughs align, resulting in an increase in the amplitude.

Here, we have a wave with an amplitude of 10 cm and another wave with an amplitude of 15 cm. To determine the maximum displacement that may result when they overlap, we need to consider the combined effect of their amplitudes. Since constructive interference occurs when the waves are in phase, the maximum displacement will be the sum of the individual amplitudes. Adding 10 cm and 15 cm yields a maximum displacement of 25 cm. Therefore, the maximum displacement that may result when the waves overlap is 25 cm. This signifies the peak combined effect of the two waves, resulting in a larger amplitude at specific points of overlap. i.e.,

the maximum displacement is given by:

Maximum displacement = Amplitude of Wave 1 + Amplitude of Wave 2

Maximum displacement = 10 cm + 15 cm

Maximum displacement = 25 cm

Therefore, the maximum displacement that may result when the two waves overlap is 25 cm.

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