Bob has been asked to produce a fuse that has 3. 2 ohms of resistance. He cannot change he thickness of the wire but can change its length. Explain in detail how bob could work out what length of wire to use. You will need to describe the experiment he will need to carry out , any hazards and any variables involved

Momentum of the 80 kg player is 240 kg⋅m/s (80 kg× 3 m/s).Momentum of the 60 kg player is 180 kg⋅m/s (60 kg×3 m/s).The velocity of the 60 kg player must be -3 m/s.

Momentum is an important concept in physics which describes the physical quantity of a moving body's inertia. It is a vector quantity, meaning it has both a magnitude and a direction. Momentum is equal to the product of mass and velocity, and is measured in kilograms-meters per second (kgm/s). Momentum is conserved in closed systems, meaning that the total momentum of a system will remain the same, regardless of any changes in mass or velocity. Momentum is a very useful tool for understanding the motion of objects, particularly in collisions and impacts.

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Answer:

Explanation:

The frequency of the wave given it's velocity and wavelength can be found by using the formula

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

where

c is the velocity of the wave in m/s

\( \lambda\) is the wavelength in m

From the question

c = 7.9 m/s

\( \lambda\) = 3.1 m

We have

\(f = \frac{7.9}{3.1} = 2.548387... \\ \)

We have the final answer as

Hope this helps you

Unless a light ray comes into contact with a surface or enters a different material, it travels in a​ straight line.

When light enters a medium with a different speed or transitions from a fast to a slow medium, refraction occurs. According to Snell's law, if a light ray is incident ordinarily on the surfaces, then deviating from the normal will always lengthen the travel time.

Theoretically, sine (angle of incidence)*index of refraction of the incident media = sine (angle of refraction)*index of refraction of the refractive medium

Sine (0)=0 because the angle of incidence is 0 degrees.

As a result, the light ray will travel straight.

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Answer:

C!

Explanation:

The continental crust being  the coolest region is what the diagram shows

about Earth’s interior.

Continental crust contain rock particles such granite. They also contain

other compounds such as silicon and aluminium. They are low conductors of

heat which is why it has a cool temperature.

The continental crust is referred to as the coolest region due to the high

pressure experienced in this region when compared to the lower mantle

which translates to having a lower temperature.

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Be sure to follow proper safety precautions when working with a light source, and handle the flat surface (new medium) carefully to avoid any damage or injuries.

What is Reflection?

Reflection is a phenomenon that occurs when a wave, such as light or sound, strikes a surface and bounces back, either returning to the same medium or entering a new medium. It involves the change in direction of a wave as it encounters a surface, resulting in the wave bouncing off the surface and changing its direction.

A light source (e.g., a flashlight or a laser pointer)

A flat surface to act as the new medium (e.g., a piece of glass or a mirror)

A protractor or an angle-measuring tool

A ruler or a measuring tape

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The angle of incidence and angle of reflection are equal, according to the law of reflection.

Define angle of incidence and angle of reflection.

The angle between this normal and the incident beam is known as the angle of incidence, and the angle between this normal and the reflected ray is known as the angle of reflection. The angle of incidence and angle of reflection are equal, according to the law of reflection.

According to the Law of Reflection, the angle of incidence and the angle of reflection, as measured from the normal to the surface, are equal. Curved surfaces are irrelevant since the angles are calculated from the normal, which is perpendicular to the surface. This is the foundation for curved mirrors like concave and convex ones.

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The car must start at a height of approximately 127.55 meters on the hill in order to achieve a speed of 50 m/s at the bottom, assuming it is engineless and resistance-free.

To determine the height on a hill at which an engineless, resistance-free car must start in order to achieve a speed of 50 m/s at the bottom, we can use the principle of conservation of mechanical energy.

According to this principle, the sum of the potential energy and the kinetic energy of an object remains constant in the absence of external forces.

At the top of the hill:

The car has only potential energy (PE) due to its height above the bottom.

At the bottom of the hill:

The car has both potential energy and kinetic energy (KE).

Since the car is engineless and resistance-free, we can neglect any energy losses due to friction or air resistance.

The total mechanical energy (E) at the top of the hill is equal to the total mechanical energy at the bottom of the hill:

Etop = Ebottom

The potential energy (PE) at the top of the hill is given by the formula:

PE = m * g * h

Where m is the mass of the car, g is the acceleration due to gravity, and h is the height of the hill.

The kinetic energy (KE) at the bottom of the hill is given by the formula: KE = (1/2) * m * \(v^{2}\),

Where v is the speed of the car at the bottom.

Therefore, we have:

PEtop = KEbottom

m * g * h = (1/2) * m * \(v^{2}\)

We can cancel out the mass (m) from both sides of the equation:

g * h = (1/2) * \(v^{2}\)

Now, we can solve for the height (h):

h = (1/2) * \(v^{2}\) / g

Substituting the given values:

v = 50 m/s (speed at the bottom)

g = 9.8 m/\(s^{2}\) (acceleration due to gravity)

h = (1/2) * \((50 m/s)^2\) / (9.8 m/\(s^{2}\))

h = 127.55 m

Therefore, the car must start at a height of approximately 127.55 meters on the hill in order to achieve a speed of 50 m/s at the bottom, assuming it is engineless and resistance-free.

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Red light of 640 nm wavelength appears in first order at an angle of 56.5° with a diffraction grating of 2,030 grooves/cm.

The place where light of a specific frequency diffracts relies upon the separating between the depressions of the diffraction grinding. The condition that relates the point of diffraction (θ) to the frequency of light (λ) and the furrow separating (d) is:

sinθ = mλ/d

where m is the request for diffraction (m=1 for first request, m=2 for second request, and so on.).

For this situation, the diffraction grinding has 2,030 notches for each centimeter, or 20.3 depressions per millimeter. The depression dispersing is consequently:

d = 1/20.3 mm/groove = 0.04926 mm/groove

We can now connect the qualities for λ, d, and m=1 to settle for θ:

sinθ = (1)(640 nm)/(0.04926 mm/groove)

θ = \(sin^-1(0.833) = 56.5°\)

Thusly, red light of frequency 640 nm will show up in first request at a point of roughly 56.5°.

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Answer:

C

Explanation:

The composition of a comet compared with that of the Sun is C "Comets are made of ice and dust, while the Sun is made of gas".

Comets are small, icy bodies that originate from the outer solar system and are composed mainly of frozen water, carbon dioxide, methane, and ammonia, along with dust and small rocky particles. When a comet approaches the Sun, its icy material vaporizes, creating a glowing coma (a hazy atmosphere around the nucleus) and a tail that points away from the Sun due to the solar wind.

On the other hand, the Sun is a giant ball of hot, glowing gas, composed mainly of hydrogen (about 73% of its mass) and helium (about 25% of its mass), with trace amounts of other elements like oxygen, carbon, and iron. The Sun generates energy through nuclear fusion reactions in its core, which convert hydrogen into helium and release a tremendous amount of energy in the process.

Therefore, the composition of a comet is quite different from that of the Sun. While both objects contain some water (in the form of ice for comets and vapor for the Sun), comets are predominantly made of ice and dust, while the Sun is predominantly made of gas, with only a small amount of solid material in its core.

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Answer: I'm like 98% sure it's fluorescent cause it's got mercury

Explanation:

The blower uses 100 volts of the difference in potential when consumes current of 3 c/s in a time of 5.10min

The bulb is filled with a gas, typically a mixture of nitrogen and argon, that reduces the oxygen in the bulb to help stop the filament from burning. A filament with a high electric current resistance is made of a special wire, usually tungsten.

First, we should convert the power and the time:

Power of blower = 3.0 x 10² J/s

                         = 3.0 x 10² W

Time = 5.10 min

                         = 5.10 x 60 s

                                 = 306 s

Now, Charge = I × t

                        = 3 A × 306 s

                                      = 918 C

Finally, we can calculate the potential difference consumed:

                             ΔV = P × t / Q

                          ΔV = (3.0 x 10² W) × (306 s) / (918 C)

                               ΔV = 100 V

An electrical circuit is completed when a switch is turned on, allowing electric current to flow through its wires. Through the switch, along the wires, and into the light bulb, the current flows from the power source.

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Answer:

B. to kill harmful bacteria

Explanation:

Ultraviolet light can be used in a variety of ways including killing harmful bacteria and sterilization

A 3D mouse is an example of a unique input/output device that is used primarily for navigating through 3D models.

This device works by providing six degrees of freedom, allowing the user to move objects in 3D space in a manner that is natural and intuitive.

How it works?

A 3D mouse works by detecting movements in six different directions, which it then translates into movements on the screen.

It is equipped with a range of buttons that can be customized to perform different functions, making it a very versatile input device.

This input device is unique because it enables users to interact with virtual 3D objects in a manner that is more natural and intuitive than using a traditional mouse or keyboard.

Why is it unique?

The 3D mouse is unique because it provides a level of precision and control that is not possible with other input devices.

It allows users to manipulate 3D models with a high degree of accuracy, making it an essential tool for professionals who work in fields such as architecture, engineering, and design.

Its ability to provide a natural and intuitive way to interact with 3D models is another factor that sets it apart from other input devices.

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The initial speed of the girl's ball relative to the boy is 3 m/s. ​

The initial speed of the girl's ball relative to the boy depends on the time of motion of the girls ball.

The time of motion of the ball from the given height is calculated as follows;

h = vt + ¹/₂gt²

where

h = 0 + ¹/₂gt²

h = ¹/₂gt²

t = √(2h/g)

t = √(2 x 1.5 / 9.8)

t = 0.55 s

The final velocity of the ball is calculated as;

v = gt

v = 9.8 x 0.55

v = 5.39 m/s

However, since we are looking for the initial speed of the girl's ball relative to the boy, we will ignore the final velocity of the ball.

The initial velocity of the ball = 0

The initial velocity of the girl's ball = 2 m/s + 1 m/s = 3 m/s

The relative velocity = 3 m/s - 0 m/s = 3 m/s

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Globular clusters provide valuable insights into our galaxy, the Milky Way, and our place within it. Here are a few key points:

1. Age and Composition: Globular clusters are ancient and contain some of the oldest known stars in our galaxy. By studying their age and composition, scientists can gain information about the early stages of galaxy formation and the chemical enrichment processes that occurred over time.

2. Halo Structure: Globular clusters are primarily found in the halo of our galaxy, a region that surrounds the central bulge and disk. Their distribution in the halo suggests that they formed early in the history of the Milky Way. This provides clues about the formation and evolution of our galaxy.

3. Galactic Dynamics: The motions of globular clusters within the galaxy's gravitational field can be studied to understand the overall structure and dynamics of our galaxy. They help astronomers map the distribution of mass and determine the gravitational forces acting within the Milky Way.

4. Distance Measurements: Since globular clusters are relatively bright and contain standard candle stars (stars with known luminosity), they can be used as distance indicators.

By measuring their apparent brightness and comparing it to their intrinsic luminosity, astronomers can determine their distances and improve our understanding of the size and structure of the Milky Way.

5. Exoplanet Studies: Some globular clusters have been found to harbor exoplanets, planets outside our solar system. Studying exoplanets within globular clusters provides insights into their formation and evolution under unique environmental conditions.

Overall, globular clusters serve as valuable tools for studying the formation, structure, and dynamics of the Milky Way. They contribute to our understanding of our galaxy's history and our place within it.

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Answer:

rotation

Explanation:

Im pretty sure. Please heart and mark brainliest

Answer:

cycle

Explanation:

either rotation or cycle. I would think.

Answer: When a funnel is dipped into a liquid soap solution, soap molecules from the solution stick to the surface of the funnel and form a thin film. As the film becomes thinner, it reaches a point where it can no longer support its own weight, and gravity causes it to detach from the funnel and form a soap bubble.

When the funnel is removed, the soap bubble remains intact due to the surface tension of the soap film. Soap molecules have hydrophilic (water-attracting) and hydrophobic (water-repelling) ends, which enable them to form a stable film at the surface of the liquid. The surface tension of the soap film creates a force that tries to minimize the surface area of the bubble, which is why soap bubbles tend to form spherical shapes.

However, the soap bubble is not stable and will eventually burst due to a number of factors, such as evaporation of the liquid, changes in temperature or humidity, or contact with other objects. When the soap bubble bursts, the soap film breaks apart and the soap molecules mix with the surrounding air or liquid.

Explanation:

When a funnel is dipped into a soap solution and removed, a soap bubble forms due to the surface tension of the soap solution. As air is blown into it, the bubble expands until it pops when the soap film can't withstand the pressure difference anymore.

When a funnel is dipped into a liquid soap solution and then removed, a soap bubble forms at the end of the funnel. This phenomenon occurs due to a property of liquids known as surface tension. Surface tension is the force that causes the liquid surface to contract, thus forming a shape with the minimum possible area, a sphere.

After the funnel is dipped into the soap solution, a thin film of soap solution forms inside it. When the horn is removed and the air is blown from the other end, the air trapped inside the thin soap film expands to include a bubble.

Eventually, gravity causes the liquid soap to flow downwards, thinning the top of the bubble, and the bubble will pop when the film is too thin to sustain the pressure difference between the inside and outside. So, stating and explaining what happens to the bubble when the funnel is removed can also take into consideration the effect of gravity in this process.

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The correct direction of the net electric force of the positive charge is 6. Option D.

The net electric force on the positive charge (+q) at the top right corner of the square will be the vector sum of the individual electric forces created by the four charges. Since the charges on the left side and the bottom right side of the square are negative, they will exert an attractive force on the positive charge.

The charge on the bottom left side of the square is also negative, but it will exert a repulsive force on the positive charge since it is on the same side as the positive charge. The net electric force on the positive charge will be directed towards the bottom left corner of the square.

Therefore, the correct direction of the net electric force on the positive charge is option d, which corresponds to the bottom left corner of the square.

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Answer:

\(E_2=80N/C\)

Explanation:

From the question we are told that:

Initial Distance \(d_1=40cm=>0.4m\)

Initial Electric field strength \(E_1=100N/C\)

Final Distance \(d_2=20cm=>0.20m\)

Generally the equation for Electric field is mathematically given by.

 \(E=\frac{kq}{d^2}\)

 \(q=\frac{100*(0.4)^2}{K}\)

Substituting q for \(d=20cm\)

 \(E_2=\frac{k}{0.2}*\frac{100*(0.4)^2}{K}\)

 \(E_2=80N/C\)

Answer:

B because Needs are things that are essential to life but wants are just extra.

Explanation:

For example food and water is needed for life but a want would be to have the latest I phone

A major difference between economic wants and economic needs is: B- Needs are more important to survival than wants.

Economic wants can be defined as the goods and services that are desired by consumers but are not important for their survival. Some examples of economic wants are mobile phone, automobile cars, computer, clothes, television, furniture, etc.

Economic needs can be defined as the goods and services that are required by the people or consumers for their daily survival. Some examples of economic needs are: shelter, food, water, land, air, etc.

In conclusion, economic wants are less important because they are just our different desires in life but economic needs are very important and significant for the daily survival of humans because they are the basics of life.

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Explanation:

ANSWER

g

m

=

R

2

GM

1.4=

R

2

(6.667×10

−11

)(7.34×10

22

)

R=

1.4

6.667×10

−11

(7.34×10

22

)

=

34.95×10

11

=1.87×10

6

m

HOPE IT'S HELP AND PLZ FOLLOW ME

According to the data given in the question the net force on the box is of 5 N.

All of the forces that are applied to an object are added up to form the net force. As a consequence of the fact that it (force) is a vector and therefore that two forces with identical magnitudes and opposing directions cancel each other out, the resultant force is the total of the forces, or put another way, the net force is just the total of all the forces.

Given data :

Force on box to the left side (F1) = 15 N

Force on box to the right side (F2) = 20 N

Because both forces are in opposite direction

Hence,

Net force = F2 - F1

Net force = 20 - 15

Net force = 5 N.

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Answer:

The equation of impact is shown the impulse.

Explanation:

Given that,

The following statements,

(a). Why are car steering rods designed to collapse?

(b). Why are highway guard rails designed to crumple upon impact?

(c). Why are traffic safety barrels filled with water or sand?

We know that.

The equation of impact is shown the impulse.

Impulse :

Impulse is equal to the change in momentum.

In mathematically,

\(\Delta p=F\Delta t\)

Where, F = force

\(\Delta t \) = change in time

\(\Delta p \) =change in momentum

We can be minimized of force of impact by maximizing the time of impact.

We can explain the following statements,

(a). Car steering rods designed to collapse for increases the time of impact, decreases the force of impact and reduce the damage caused

(b). Highway guard rails designed to crumple upon impact for increases the time of impact, decreases the force of impact and reduce the damage caused

(c). Traffic safety barrels filled with water or sand because they are increased the time impact.

Hence, The equation of impact is shown the impulse.

Answer: C

A hypothesis is a testable explanation with some research behind it. An Hypothesis can be right or wrong.

The answer is C.

Hope it helps!

Answer:

c. is the answer but I'm not 100% sure

hypothesis

Answer:

mph (miles per hour) and kph (kilometers per hour)

Let's explain why Common Emitter (CE) configuration is preferred over Common Collector (CC) for amplification purposes.

Common Emitter amplifier is an amplifier that offers high current gain, medium input resistance and high output resistance.

Common Collector is another type of amplifier where the input signal is applied to the base and the ouput signal is taken from the emitter.

The Common Emitter configuration is preferred over the Common Collector configuration because the Common Emitter offers a high power gain(high voltage and current gain), and has a lower resistance when compared to the Common Collector configuration.

ANSWER:

The common Emitter configuration has higher voltage and current gain when compared to the Common Collector configuration.

Answer:

linear motion

Explanation:

the birds in the sky show oscillatory motion when they flap their wings

Answer: 3.775 KG

Explanation:  W = 37 N

                        m = ?

               AS WE KNOW THAT

                        W = mG

                         37 = m 9.8

                         m = 37/9.8

                          m = 3.775 KG

The feet and meter are the units used to measure the length. Here the maximum height in meter at which a scaffold should be placed is 20 feet is 6.097 m.

The feet is a standard unit of measurement. It is used to measure the length and distance of the objects. Feet is the plural alternative whereas the foot is the singular additive.

The metric system includes meters, centimeters, etc., whereas the imperial system includes foot, inches, yards, etc.,

Here 1 meter = 3.280 feet

So 20 feet = 6.097 m

Thus the maximum height in meter at which a scaffold should be placed is 20 feet is 6.097 m.

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OSHA regulations generally suggest the maximum height for a scaffold to be around 20 feet. This is to primarily ensure the workers' safety and to prevent accidents.

The maximum height at which a scaffold should be placed is typically set by OSHA (Occupational Safety and Health Administration) regulations. In general, the maximum height for a scaffold is usually around 20 feet.

This setting ensures that workers utilize the scaffold appropriately at a safe height to prevent accidents, such as falls occurring from a height the humans are unprepared to handle. Worker Safety and adherence to the safety standards is the ultimate goal behind this regulation.

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Explanation:

a) Distance ➤ (80+50+70+40) m. ➤ Distance= 240m.

b) Displacement ➤ (50+40)m. ➤ Displacement= 90m

c) Average Speed ➤ Total distance travelled/total time taken

                              ➤ 240/48

                              ➤ 5 \(ms^{-1}\)

d) Average Velocity ➤ Total displacement/total time taken

                                 ➤ 90/48

                                 ➤ 1.875 \(ms^{-1}\)

The work that must be supplied to the refrigerator for it to reject 1000 kj of heat to the room it is placed is 625 kj.

A refrigerator works by absorbing heat from inside and rejecting it to the outside environment. The coefficient of performance (COP) is a measure of its efficiency and is defined as the ratio of the heat removed from the refrigerator to the work supplied to it. In this case, the COP of the refrigerator is given as 1.6.

To find out how much work must be supplied to the refrigerator for it to reject 1000 kj of heat to the room, we can use the equation:

COP = Qc / W

where Qc is the heat rejected to the room and W is the work supplied to the refrigerator.

Rearranging the equation, we get:

W = Qc / COP

Substituting the given values, we get:

W = 1000 kj / 1.6

W = 625 kj

Therefore, the work that must be supplied to the refrigerator for it to reject 1000 kj of heat to the room it is placed is 625 kj. This means that the refrigerator is capable of transferring 1000 kj of heat from inside to outside by consuming 625 kj of work, making it an efficient cooling system.

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