A boat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. If the river is flowing with a velocity of 2.5 meters/second in the same direction as the boat. What would be the magnitude of the boat’s velocity? A. 16.5 meters/second B. 20.5 meters/second C. 18 meters/second D. 2 meters/second E. 45 meters/second

Protons can never change for any particular element because they're in the nucleus and the force keeping them there is extremely strong and hard to overcome. Electrons, however, orbit the nucleus and they change all the time. When electrons either leave or join an atom they form ions.

Positive ions (cations) are when electrons leave, so the positive charge is greater than the negative charges, and negative ions (anions) are when electrons join so the negative charge is greater than the positive charge.

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To determine how far from a bus stop the bus should start to slow down, we need to consider the bus's deceleration and the desired speed when reaching the bus stop. Let's assume the bus needs to slow down to a speed of 10 km/h when it reaches the bus stop.

First, we need to calculate the deceleration of the bus. Let's say the deceleration is -2 m/s² (negative sign indicating deceleration). To convert this into km/h², we can use the conversion factor: 1 km/h² = 0.27 m/s². Next, we need to calculate the time it takes for the bus to decelerate from 36 km/h to 10 km/h. Using the formula: acceleration = (final speed - initial speed) / time, we can rearrange it to solve for time: time = (final speed - initial speed) / acceleration.

Applying the values, we get: time = (10 km/h - 36 km/h) / (-2 km/h²) = 13 seconds. Finally, we can calculate the distance traveled during this deceleration period using the formula: distance = initial speed * time + (1/2) * acceleration * time². Plugging in the values, we get: distance = 36 km/h * 13 seconds + (1/2) * (-2 km/h²) * (13 seconds)². Simplifying the equation, we find that the bus should start slowing down about 702 meters (or 0.702 km) from the bus stop. Therefore, the bus should start to slow down about 702 meters from the bus stop to reach a speed of 10 km/h when it arrives.

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The golf ball has a wavelength of 2.3281034m. The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal carried in space or along a wire is defined as the wavelength.

This length is typically defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

A matter wave is connected with all moving particles with mass. These matter waves are referred to as deBroglie waves.

A particle's deBroglie wavelengths is given by, where h is the Planck's constant, m is the mass of the ball, and v is its velocity.

Calculate the deBroglie wavelength of a moving golf ball by substituting 6.6261034J s for h, 45.9103kg for m, and 62.0 m/s for v.

The golf ball has a wavelength of 2.3281034m.

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Answer:

4.  wavelength (λ)

5.  slit distance (d)

Explanation:

I assume you did a double-slit experiment?  If so, then:

The number of bands observed on the screen depends on the wavelength (λ) and the slit distance (d), while the screen distance (L) does not directly affect the number of bands.

Wavelength (λ): The number of bands is directly proportional to the wavelength. When the wavelength increases, the fringe separation on the screen increases, resulting in a greater number of bands.

Slit distance (d): The number of bands is inversely proportional to the slit spacing (distance). When the slit spacing increases, the fringe separation on the screen decreases, resulting in a smaller number of bands.

Screen distance (L): The screen distance does not directly affect the number of bands. It primarily affects the size and overall pattern of the interference fringes but does not change the number of bands.

Summary:

Wavelength (λ) is directly proportional to the number of bands.

Slit distance (d) is inversely proportional to the number of bands.

Screen distance (L) does not directly affect the number of bands.

saitama is the strongest

Answer:

D

Explanation:

To represent objects, processes, and systems that are too large, too small, or too complex to study directly

The correct option is (d) To represent objects, processes, and systems that are too large, too small, or too complex to study directly.

The 4 types of scientific models -

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Based on the laws of physics and the nature of the spacecraft's journey, the most likely outcome would be option C: Velocity slowing with time.

As an engineer monitoring the Voyager spacecraft as they venture into interstellar space, I would expect to see a specific trend in terms of their speed.

The Voyager spacecraft are now leaving the gravitational influence of the Sun and entering the vast expanse of interstellar space. As they move away from the Sun, the gravitational pull decreases, and the spacecraft experience the effects of other celestial bodies' gravitational forces at a much smaller scale.

While interstellar space is not completely devoid of matter, it is significantly less dense than the solar system. The Voyager spacecraft will encounter occasional interstellar particles and their gravitational influences, leading to a gradual deceleration of their velocity over time.

However, it is important to note that the deceleration will be relatively small and gradual due to the sparse nature of interstellar space. The decrease in velocity would likely be minimal and may not be noticeable over short periods.

In summary, as an engineer monitoring the Voyager spacecraft's journey into interstellar space, I would expect to observe a trend of velocity slowing with time as the spacecraft gradually move away from the Sun and experience the effects of interstellar particles and their gravitational influences.

So, option C is correct.

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The work required to stretch the spring from 24 cm to 27 cm is approximately 4.50 J (joules). To calculate the work required, we can use Hooke's Law and the formula for work done on a spring:

Hooke's Law:

F = k × x,

where F is the force, k is the spring constant, and x is the displacement from the natural length.

First, we need to find the spring constant (k).

We are given that a 20-N force is required to stretch the spring to 30 cm (a 6 cm displacement).

20 N = k × 6 cm
k = 20 N / 6 cm ≈ 3.33 N/cm

Now, we can find the work (W) required to stretch the spring from 24 cm to 27 cm (a 3 cm displacement).

The formula for work done on a spring is:

W = (1/2) × k × (x₁² - x₂²),

where x₂ is the final displacement and x₁ is the initial displacement.

W = (1/2) × 3.33 N/cm × (3 cm² - 0 cm²)
W ≈ 4.50 J

To stretch the spring from 24 cm to 27 cm, approximately 4.50 J of work is required.

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Answer:

1.927  m/s^2

Explanation:

period = 2 pi  sqrt ( l/g)  

3.2   =  2 pi sqrt (.5/g) =1.927 m/s^2

The new minimum wavelength of the X-rays produced would be 0.03 nm.



The minimum wavelength of X-rays produced by an X-ray source is directly proportional to the energy of the electrons that are bombarding the target material. The energy of the electrons is determined by the cathode current, which is the flow of electrons from the cathode to the anode.

If the cathode current is doubled, then twice as many electrons are emitted per unit time. This means that the energy of the electrons bombarding the target material will also be doubled, as energy is directly proportional to the number of electrons.

Since the minimum wavelength of X-rays is directly proportional to the energy of the electrons, this doubling of the energy will result in the minimum wavelength being halved. Therefore, the new minimum wavelength of the X-rays produced would be 0.03 nm (half of the original value of 0.06 nm).

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Answer:

when light falls on denser medium it may be reflected back or enters the medium and if it enters the medium it refracts towards the normal line of the medium.

The mass of the beam, given that the beam is balanced is 400 g

First, we shall re-conctruct the diagram given to better understand what we are looking for. Please see attached photo.

In the attached photo,

Note: The mass of the beam act at the centre of the beam

Now, we shall determine the mass of the beam as follow:

Anti-clock wise moment = Clock wise moment

200 × 20 = M × 10

4000 = M × 10

Divide both sides by 10

M = 4000 / 10

M = 400 g

Thus, from the above calculation, we can conclude that the mass of the beam is 400 g

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The latitude/longitude system is the most widely used and is often used to identify a location on a global scale. UTM coordinates are often used in local-scale mapping applications.

It comprises a framework of lines or grids that encircle the planet and make it possible to specify locations with great precision. Two widely used geographic coordinate systems are the latitude/longitude and the Universal Transverse Mercator (UTM) coordinate systems.

The difference between the latitude/longitude coordinate system and the UTM coordinate system are listed below:Latitudes and longitudes are calculated with reference to the Earth's center of gravity. The coordinates are represented in the form of (latitude, longitude).On the other hand, UTM coordinates are projected.

This means that the globe is flattened and projected onto a two-dimensional plane. UTM divides the earth into 60 zones, with each zone covering a span of six degrees of longitude. UTM divides each zone into 20 parallel bands that are equally spaced.

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Answer:

Hence, option (A) is correct answer.

Explanation:

If the plates are moved closer together, the velocity with which the electrons hit the plate will increase. This is because the distance between the plates affects the electric field strength between them. When the plates are closer together, the electric field becomes stronger.

To understand this, let's consider a parallel plate capacitor, which consists of two conducting plates separated by a distance d. When a voltage is applied across the plates, an electric field is created between them. Electrons, being negatively charged, will be attracted to the positively charged plate and repelled from the negatively charged plate.

When the plates are moved closer together, the electric field becomes stronger. As a result, the force on the electrons is greater, causing them to accelerate more. According to Newton's second law of motion, F = ma, where F is the force, m is the mass, and a is the acceleration. Since the force on the electrons increases, their acceleration also increases.

The velocity of an object is directly proportional to its acceleration. Therefore, if the acceleration of the electrons increases, their velocity will also increase. Consequently, when the plates are moved closer together, the velocity with which the electrons hit the plate will increase.

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Answer:

"Changing the amplitude of a signal is straightforward: We just need to multiply each sample with some constant number. In the case of sine waves, if what we want is a wave with amplitude a, our wave function becomes y = a * Math.sin(x)."

Explanation:

Risk*

The effect of the distance of a launcher affects the speed of a car in that an optimum distance is desirable for optimal performance.

If the distance is too small the speed of the car will be minimal, also of the distance is too large, the speed of the car will be small also.

Hence, the speed is optima only when we have an optima distance in between.

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Astronomers thought that a nova was a new star, appearing for the first time in the heavens, today we know that it is as a binary star system.

A binary star system is known to be one where one star is known to be called a white dwarf and there is a mass that is said to be transferred to it

A binary star is known to be a kind of a system that is composed of two stars that are known to be gravitationally held together to and in orbit near each other.

Note that Binary stars in the night sky are ones that are often seen as a single object and thus Astronomers thought that a nova was a new star, appearing for the first time in the heavens, today we know that it is as a binary star system.

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Each time a method executes, any parameter variables listed in the method header are initialized. This means that the variables are given a default value, oftentimes a specific type, depending on what is specified in the method header.

If no default value is specified, then the variables will be initialized to null. It is important to initialize variables when declaring a method as it helps to ensure that the code will run correctly.

Additionally, initializing the parameter variables in the method header can help make the code easier to read and understand, as it sets the expectations for what type of data is being passed in and what should be expected to be returned.

This is especially helpful when dealing with larger projects with multiple functions and methods. Initializing the parameter variables in the method header can make it easier to debug the code and can help prevent errors from occurring.

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Answer:

30 km per hour

Explanation:

Answer:

30km/h

Explanation:

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By regulating the location of bones within the body, the skeletal system.

The nerve system, which the brain uses to regulate the body. The somatic nervous system and the autonomic nervous system are its two main branches. The spinal cord and brain are both parts of the somatic nervous system. It is in charge of regulating the body's voluntary processes, including breathing, swallowing, walking, and talking.

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Answer:

ρ (density) = M / V         mass / unit volume

ρ = 10 g / 5 cm^3 = 2 g/cm^3        density of the metal

The current in the circuit would be approximately 13.33 Amps.

To find the current in the circuit, we can use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R).

In this case, the resistance of each element is 36 ohms, and they are connected in parallel. When resistors are connected in parallel, the total resistance (Rt) can be calculated using the formula:

1/Rt = 1/R1 + 1/R2 + 1/R3 + ...

1/Rt = 1/36 + 1/36

1/Rt = 2/36

1/Rt = 1/18

Rt = 18 ohms

To calculate the current (I) in the circuit, we can use Ohm's law:

I = V / Rt

I = 240 V / 18 ohms

I ≈ 13.33 Amps

The correct option is d. 13.3 Amps.

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If you add 1.70 kg of air to an empty tank, the final gauge pressure can be calculated using the ideal gas law. However, we need to make some assumptions about the conditions of the air being added.

First, we assume that the air still comes out of the compressor at a temperature of 42°C. This means that the initial temperature of the air is 42°C. We also assume that the volume of the tank is constant, so the final volume of the air is equal to the volume of the tank.

Using the ideal gas law, we can calculate the final gauge pressure:

PV = nRT

where P is the final gauge pressure, V is the volume of the tank, n is the number of moles of air added, R is the universal gas constant, and T is the final temperature of the air.

We can calculate the number of moles of air added using the mass of the air and the molar mass of air:

n = m/M

where m is the mass of the air (1.70 kg) and M is the molar mass of air (28.97 g/mol).

Substituting these values into the ideal gas law, we get:

P = (nRT)/V = (m/M)RT/V

We can assume that the pressure of the air leaving the compressor is 1 atm (standard atmospheric pressure). We also know that the final temperature of the air is 42°C + 273.15 = 315.15 K.

Assuming the tank has a volume of 1 m³, we can calculate the final gauge pressure:

P = (1.70 kg / 28.97 g/mol) * 0.0821 L·atm/mol·K * 315.15 K / 1 m³

P = 5.98 atm

Therefore, the final gauge pressure of the tank would be approximately 5.98 atm if 1.70 kg of air is added to an empty tank, assuming the air still comes out of the compressor at a temperature of 42°C.

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All of the following are major body tissue types except Lymphatic tissue.

Tissue is the mass of the cell of body of human.

The lymphatic system is an extensive network of vessels, nodes, and ducts that pass through almost all bodily tissues. It allows the circulation of a fluid called lymph through the body in a similar way to blood.

The lymphatic system is a network of vessels, nodes, and ducts that collect and circulate excess fluid  in the body.

The lymphatic system is part of the immune system. It also maintains fluid balance and plays a role in absorbing fats and fat-soluble nutrients.

The lymphatic system drains excess fluid that accumulates in bodily tissue, filters out foreign bodies, and transports it back into the bloodstream.

Failures of the lymphatic system can cause swelling, venous dysfunction, and life threatening complications.

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Explanation:

F = k |q1| |q2| / r^2

k = 9 * 10^9

q1 = - 2.5 C

q2 = 2 C

r = 100

r^2 = (10^2)^2 = 10^4

F = (9*10^9) * ( 2.5 ) ( 2) / ( 100)^2

F = 45* 10^9 / 10^4

F = 45 * 10^9 * 10 ^ -4 = 45 * 10^5 N

F = 45 * 10 ^ 5 N

Answer: (a) The speed is zero.

(b) The speed of the electrons ejected by light of wavelength 350 nm is 6.0 × 10⁵ m/s.

a) Let's find out the energy of the incident light by using E = hc/λ

where E is the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength of the light. Here we have λ = 740 nm = 7.4 × 10⁻⁷m

So, E = hc/λ

= (6.63 × 10⁻³⁴ J.s × 3 × 10⁸ m/s)/(7.4 × 10⁻⁷m)

= 2.69 × 10⁻¹⁹ J.

Since the work function is given in electron volts, we need to convert the energy into eV.1 eV = 1.6 × 10⁻¹⁹ J2.69 × 10⁻¹⁹ J = (2.69 × 10⁻¹⁹ J / 1.6 × 10⁻¹⁹ J/eV) = 1.68 eVThe kinetic energy of the ejected electron can be calculated as the difference between the energy of the incident light and the work function.KE = E - Φ = 1.68 eV - 2.14 eV = -0.46 eV. Since the electron has a negative kinetic energy, it is not ejected. Therefore, the speed is zero.

b) To find the speed, we can use the formula: KE = 1/2 mv²

v = √(2KE/m)

The mass of the electron is 9.11 × 10⁻³¹ kg. So,

v = √(2 × 1.41 eV × 1.6 × 10⁻¹⁹ J/eV / 9.11 × 10⁻³¹ kg)= 6.0 × 10⁵ m/s.

Therefore, the speed of the electrons ejected by light of wavelength 350 nm is 6.0 × 10⁵ m/s.

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The potential to which you should charge the capacitor is approximately 1732.05 V.

To determine the potential to which you should charge a 1.00 μF capacitor to store 1.50 J of energy, you can use the formula for the energy stored in a capacitor, which is given by:

E = 1/2 * C * V²

where E is the energy stored, C is the capacitance, and V is the potential difference across the capacitor. In this case, you know that the capacitance (C) is 1.00 μF and the energy stored (E) is 1.50 J.

You need to find the potential difference (V). To solve for V, we can rearrange the formula:

V² = (2 * E) / C

V² = (2 * 1.50 J) / (1.00 μF)

Let's convert the capacitance from μF to F.

Since 1 μF is equal to 1 x 10⁻⁶ F:

V² = (2 * 1.50 J) / (1.00 x 10⁻⁶ F)  

V² = 3.00 x 10⁶ J/F

To find V, we take the square root of both sides of the equation:

V = √(3.00 x 10⁻⁶ J/F) V

≈ 1732.05 V

Therefore, to store 1.50 J of energy in a 1.00 μF capacitor, you should charge it to a potential of approximately 1732.05 V. In conclusion, the potential to which you should charge the capacitor is approximately 1732.05 V.

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