An electric force exists between which pair of objects? Check all that apply.

A) a neutral object and a negative object
two negative objects
B) a neutral object and a positive object
C) two positive objects
D) a negative object and a positive object
E) two neutral objects

If we imagine the rectangular pool to have a length L and a breadth b, the attached figure shows one of the several possible coordinate systems that can be used to locate the position of the girl at any point of time, thus enabling us to describe her motion.

Final answer:

A suitable coordinate system to describe a girl swimming across a rectangular pool is to use the long side as the x-axis and the short side as the y-axis. One can treat the swimmer's path as two-dimensional motion, analyzing her velocities in both x and y directions separately to predict her speed and swimming time.

Explanation:

To describe the motion of a girl swimming across a rectangular pool, we could set up a coordinate system by choosing the long side of the pool as the x-axis and the short side as the y-axis, with the origin (0,0) placed at one corner of the pool. If we observe the motion from above, we can treat the swimmer's path as two-dimensional motion.

In our coordinate system, the swimmer's position (x,y) changes over time as she swims across the pool. Since the pool is a controlled environment with no external forces like wind or currents, we can assume there's no acceleration in the horizontal x-direction (ax = 0). The swimmer might push off from one side of the pool to begin moving, in which case her initial horizontal velocity (Vx) could be constant throughout her swim if she maintains a steady pace.

To analyze the swimmer's motion, we would separately consider her velocity in the x-direction (Vx = v cos θ) and y-direction (Uy = v sin θ), where v is the magnitude of her velocity and θ is its direction relative to the x-axis. By mapping her position over time, we could use kinematic equations to predict her motion, such as her speed and the time taken to swim across the pool.

When two permanent magnets are placed adjacent to each other then they will exert magnetic force on each other.

There are four fundamental forces in nature

1. Gravitational force

2. Electromagnetic force

3. Weak Nuclear force

4. Strong nuclear force

So here magnets will exert two fundamental forces on each other Electromagnetic force and Gravity

#2

mass is defined as the composition or amount of substance while we can define weight as gravitational force of earth of the given object

Now when we transport an object from surface of earth to space far away from any planet then the amount of substance or mass will not change while the weight of the substance will decrease to zero because there is no gravity at this position

So we can say

mass = constant and will remain same

Weight = mass * gravity = 0

The weight of the object changes, the mass stays the same

The electromagnetic and gravitational forces are what affect two permanent magnets placed an inch apart, with electromagnetism being the stronger influence. If an object is moved to deep space, its weight changes due to reduced gravity, but its mass remains constant.

When two strong permanent magnets are placed one inch apart, the two fundamental forces that will most affect them are electromagnetic and gravity. The electromagnetic force is responsible for the interaction between the magnetic fields of the magnets, causing them to attract or repel each other depending on their poles. Despite being a very weak force in comparison, gravity also acts upon the magnets, although its effect is negligible compared to the electromagnetic force.

In the case of an object transported from Earth to deep space, the weight of the object changes, but the mass stays the same. Weight is the force exerted on an object by gravity, which would decrease significantly far from any stars or planets. However, mass is a measure of the amount of matter in an object, which remains constant regardless of location.

The box will move 5n left because:

10-5=5

Then, you take the side that has the biggest number. In this case, 10n left > 5n right

As long as the friction force under the box is less than 5N, it'll accelerate to the right.

a) since force = mass * acceleration  

f= 900 * 0 (because constant speed = 0 acceleration)  

similarly b) f = 0

Answer:

The car travels at twice the velocity of the truck.

Explanation:

As we know that momentum is defined as the product of mass and velocity

so here we know

mass of the car = 900 kg

mass of the truck = 1800 kg

now let say that the speed of car = [tex]v_1[/tex]

speed of truck = [tex]v_2[/tex]

so if the momentum of car and truck is same

[tex]900 v_1 = 1800 v_2[/tex]

[tex]v_1 = 2 v_2[/tex]

so we can say that car will move with double the speed of truck

Answer:

B

Explanation:

Edge 2020

The answer is:

Both the distance traveled in a given time and the magnitude of the acceleration at a given instant

Hope I Helped!

Both distances in a given time and magnitude of the acceleration at a given instant can be determined from a speed-time graph of a particle traveling in a straight line, therefore the correct option is option D.

There are three equations of motion given by  Newton

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

The area under the speed-time graph represents the distance covered by the object while the slope of the speed-time graph gives the acceleration of the object.

Thus, both distances in a given time and the magnitude of the acceleration at a given instant can be determined from a speed-time graph of a particle traveling in a straight line, therefore the correct option is option D.

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Electromagnetic spectrum is the collection of electromagnetic waves arranged from low frequency electromagnetic waves to high frequency electromagnetic waves.

Electromagnetic waves are produced by electric charge that are accelerating. When a magnetic field combines with electric field electromagnetic waves are produced. The electric field and magnetic wave are perpendicular to one another in electromagnetic waves.

Below are the type of electromagnetic waves in electromagnetic spectrum: (from high frequency ---> low frequency)

Gamma rays - it is in the end of the electromagnetic spectrum, with highest frequency but shortest wavelength. Gamma rays are generated by radioactive substances.

X-rays - it is next to Gamma rays with respect to frequency but has longer wavelength.  This wavelength can penetrate metal. It was discovered by Wilhelm Conrad Roentgen in 1895.  

Ultraviolet -  ultraviolet waves or ultraviolet radiation have shorter wavelength compared to visible light. The main source of UV radiation is the sun.

Visible Light- among other electromagnetic waves, this the only electromagnetic wave that is visible to the naked eye. The waves inside the range of visible light are the colors. From red( longest wavelength inside visible light) to violet (shortest wavelength inside visible light).

Infrared - infrared radiation is beyond the red color on the visible length. Bodies on earth radiated infrared radiation.

Hope this helps, good luck.

Answer:

Radio waves.

Explanation:

Electromagnetic spectrum is an example of an electromagnetic waves which does not require material medium for its propagation. This electromagnetic spectrums are listed according to increase in their energy level i.e from Gamma ray to Radio waves

According to the their energy level, Gamma ray>X-ray>Ultraviolet rays>Visible light>Infrared rays>Radio waves.

This arrangement is also in terms of their increasing frequency and decreasing wavelength. This shows that radiowaves has the lowest energy level out of the electromagnetic spectrum

Answer:

Taylor

Explanation:

Taylor found that with either high- or low-intensity light, a typical diffraction pattern was formed. Long exposure times were needed to develop the diffraction bands; one of the exposures needed three months to complete. With a series of photographic plates, he showed that even individual light particles, photons, have wave characteristics.

Answer:

Explanation:

Taylor lol

Answer:

(a) 42 N

(b)36.7 N

Explanation:

Nomenclature

F= force test line (N)

W : fish weight  (N)

Problem development

(a) Calculating of weight of the heaviest fish that can be pulled up vertically, when the line is reeled in at constant speed

We apply Newton's first law of equlibrio because the system moves at constant speed:

∑Fy =0

F-W= 0

42N -W =0  

W = 42N

(b) Calculating of weight of the heaviest fish that can be pulled up vertically, when the line is reeled with an acceleration whose magnitude is 1.41 m/s²

We apply Newton's second law because the system moves at constant acceleration:

 m= W/g , m= W/9.8 ,  m:fish mass , W: fish weight g:acceleration due to gravity

∑Fy =m*a

m= W/g , m= W/9.8 ,  m:fish mass , W: fish weight g:acceleration due to gravity

F-W= ( W/9.8 )*a

42-W=  ( W/9.8 )*1.41

42= W+0.1439W

42=1.1439W

W= 42/1.1439

W= 36.7  N

When the fishing line is reeled in at constant speed, it can support a fish with a weight of 42.0 N. But when there's an upward acceleration of 1.41 m/s², the line can only support a fish with a weight of about 33.7 N.

The subject in question here relates to the physics topic of forces, specifically concerning gravitational pull and tension. Now, let's address the two cases.

(a) When the fisherman reels in the line at a constant speed, there is no acceleration. Therefore, the tension in the line equals the weight of the fish. If the line can withstand a force of 42.0 N, the maximum weight of a fish that the line can support is the same—42.0 N (remember that weight is a force measured in Newtons [N]).

(b) If the fisherman is reeling in the line with an upward acceleration of 1.41 m/s2, the tension in the line will be the weight of the fish (m*g, where m is the mass of the fish and g is the gravity 9.8 m/s2) plus the result of the mass and acceleration of the fish (m*a). So, the tension T can be expressed as:

T = m*g + m*a

Since the maximum tension that the line can withstand is 42.0 N, we can determine the maximum mass fish that can be caught. Let's let the maximum mass be 'M'.

Therefore:

42.0 N = M * 9.8 m/s2 + M * 1.41 m/s2

After calculating this, you'll find that M ≈ 3.44 kg. However, we require the weight, which can be calculated by multiplying the mass by gravitational pull - hence, ≈ 3.44 kg * 9.8 m/s2 = ≈ 33.7 N.

In conclusion, under constant speed, the fisherman can pull up a fish of approximately 42.0 N, but when accelerating, the bridge fishing line can only support a fish of about 33.7 N without breaking.

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A

This is a right triangle with legs 45 and 45 . Calculating the hypotenuse gives the distance from the starting point

let hypotenuse be h, then using Pythagoras' identity

h = √(45² + 45² ) = √4050 = 63.6396.. ≈ 64

9.  Force = mass * acceleration.

F = ma

(8) = (1)a

8m/s^2 = a

10.  First solve for the kinetic energy of the vehicle:

Kinetic energy = (1/2)mass * velocity^2

KE = (1/2)(1200)(2)^2

KE = 2400J

Now use this value in the equation for work:

Since the car comes to a halt, the work is equal to the kinetic energy.

Work = Force * Displacement

W = Fd

(2400) = F(0.15)  Remember to convert cm to m

1.6*10^4 N = F

9.

The 1N = 1kg * 1 m/s^2 has no influence on the answer.

F = 8 N

m = 1 kg

a = ??

F = m * a

8N = 1 kg * a

8N/1kg = a

a = 8 m/s^2

10

This is the beginning of a 2 step process. You are back to the basic 4 equations to find the acceleration. Then you can use F = ma

Givens

m = 1200 kg

vi = 2m/s

vf = 0

d = 15 cm = 0.15 m

Formula

F = m*a

vf^2 = vi^2 + 2 * a * d

0 = 2^2 + 2 * a * 0.15,

0 = 4 + 0.3 * a

- 4 = 0.3 * a

- 4 / 0.3 = a

- 13.3333333 = a

F = m * a

F = 1200 * (- 13.3333333)

F = - 16000 N

Comment (Extremely Important)

Why aren't any of the answers minus? It is because the minus represents the amount of force needed to stop the vehicle. But the question asks you about the rock. What is the rock experiencing? The rock is opposing the 0.15 m so the force it offers is in the opposite direction to that exerted by the vehicle.

Hello!

Second options is correct answer.

Explanation: The charge on a proton is a "positive, and the charge on an electron is negative". Hope this helps! Thank you for posting your question at here on Brainly. -Charlie

Answer:

Option B is the correct answer.

Explanation:

 Velocity of a body = Displacement of the body/Time taken

Displacement and velocity are a vector. Both have direction and magnitude.

Displacement is generally distance with direction.

If we divide distance with time taken we will get speed of the airplane. Speed with direction is called velocity. So we need distance between Houston and Dallas, time taken by plane to travel from Houston to Dallas and direction of displacement from Houston to Dallas.

So we need direction.

Option B is the correct answer.

They have equal magnitudes and opposite directions.

Answer:

The magnitude of both velocities will be same but direction will be opposite.

Explanation:

Distance on Homestretch = d1 = 100 m

Distance on backstretch = d2 = 100 m

Time = t = 12.2 s

Magnitude of velocity on Homestretch = V1 = d1/t = 100/12.2 = 8.196 m/s

Magnitude of velocity on backstretch = V2 = d2/t = 100/12.2 = 8.196 m/s  

if we look at the racecourse, we will come to know that runner runs on homestretch and backstretch in opposite direction. Hence, magnitude of velocities will be same but direction will be opposite.  

[1] When any body falls under gravity,the body will move in vertical downward direction towards the centre of earth under a constant acceleration called acceleration due to gravity .As per the question, the rock falls to earth.

Hence,the correct option to it is A] It accelerates as it falls.

7] When a body moves with constant speed in a circular path,it's direction changes continuously which leads to an acceleration.

Hence the correct answer to the question is C) A car driving straight along a highway at a constant speed.

8] Speed is a scalar quantity as it has only magnitude while velocity is a vector quantity as it has both magnitude and direction for its specification.

Hence,the correct answer to this question is C) velocity is a vector and requires a direction.

9]A unit of length in the metric system will be metre or its multiples.

Hence,the correct answer to the question is B) kilometer.

10] A car taking a round curve will experience an acceleration called centripetal acceleration which is required to keep the car along the circular curve.

Hence,the correct answer to the question is B) a car that rounds a curve at a constant speed

11]The initial velocity of car is u =0

   The final velocity of car is v= 20 m/s

   The time taken t= 3.5 s

From equation of kinematics we know that-

                                          v=u+at

                                         20=0×t+3.5a

                                          [tex]a=\frac{20}{3.5} m/s^2[/tex]

                                           [tex]a=5.71 m/s^2[/tex]

Hence,the correct answer to the question is B] 5.7.

12] Any body under free fall accelerates with acceleration due to gravity.

Hence,the correct answer to the question is C) gradually more in each picture.

13] Milt moves 100 m homestretch due east and 100 m backstretch due west.

The time taken by him is 12.2 seconds. The homestretch average velocity and backstretch average velocity are anti parallel to each other as they opposite in direction.

Hence the correct answer to the question will be the homestretch and backstretch have velocities with the same in their magnitude.

14]The distance given here is constant for each lap i.e 400 m.

It has been told that he is taking 5 seconds less in each lap.

We know that average speed is the ratio of total distance travelled to total time taken.As time is decreasing in each lap,so its average speed will be more for each lap.

Hence the correct answer to the question is C] increases and inversely.

The difference between speed and velocity is that

A) speed is a vector and requires a direction.  

B) speed is a vector and requires a magnitude.  

C) velocity is a vector and requires a direction.

D) velocity is a vector and requires a magnitude.

Issac Newton

In the 17th century, Isaac Newton discovered that prisms could disassemble and reassemble white light, and described the phenomenon in his book Opticks. He was the first to use the word spectrum (Latin for "appearance" or "apparition") in this sense in print in 1671 in describing his experiments in optics.

Isaac Newton first discovered that white light is actually a mixture of different colored light rays, together forming the visible spectrum of a rainbow. therefore, option c is correct

The scientist who first discovered that white light is a mixture of a rainbow spectrum of light rays is Isaac Newton. In the seventeenth century, Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. He conducted an experiment in which he allowed sunlight to pass through a small hole and then through a prism. Newton found that sunlight, which looks white to our eyes, is actually made up of a mixture of all the colors of the rainbow.

Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. This view was later complemented by the wave theory of light when Thomas Young demonstrated the interference patterns, reconciling the particle and wave models of light into a more comprehensive dual theory known as the wave-particle duality.

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The complete Question is given below:

Which scientist first discovered that white light is a mixture of a rainbow spectrum of light rays?

a.James Watt

b.Marie Curie

c.Isaac Newton

d.Benjamin Franklin

e.Galileo Galilei

The vector best represents the net force acting on the +4 C charge in the diagram is X. The correct option is B.

A vector is the representation of a physical quantity in magnitude and direction.

A vector incline at an angle in has two components. On in x direction and other is in y direction.

Three charges are located at the vertices of a triangle, as shown.

The vector best represents the net force acting on the +4 C charge in the diagram is X.

Thus, the correct option is B.

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Answer:

The gradient of the mountain is 2.5 m.

Explanation:

Given that,

Height = 5000 m

Distance = 2 km

Gradient of the mountain is the ratio of rise of y axis and rise of x axis.

We need to calculate the gradient of the mountain

Using formula of gradient mountain

[tex]gradient\ mountain=\dfrac{rise\ y}{rise\ x}[/tex]

Put the value into the formula

[tex]gradient\ mountain=\dfrac{5000}{2000}[/tex]

[tex]gradient\ mountain=2.5\ m[/tex]

Hence, The gradient of the mountain is 2.5 m.

Answer:

Nitrogen is used to protect steel from water because nitrogen has low reactivity.

Explanation:

Nitrogen is very low reactive element because it forms a gas when triple bond between two Nitrogen atoms. Due to low reactivity of Nitrogen the water does not react with the nitrogen and steel as well. So, for protection of steel Nitrogen is used.

the correct answer is 0

The child walked a total distance of 1772 meters, which is the perimeter of the rectangular park measured by adding together twice the length and twice the width of the park.

To find out the distance the child walked around the rectangular park, we calculate the perimeter of the rectangle. The park is mentioned to be 411 meters wide and 475 meters long. To compute the perimeter, we add the length of all four sides of the rectangle together:

Perimeter of rectangle = 2( length) + 2(width)

Perimeter of the park = 2(475 m) + 2(411 m)

Perimeter of the park = 950 m + 822 m

Perimeter of the park = 1772 m

Therefore, the child walked a total distance equal to the perimeter of the park which is 1772 meters.

Answer:

a)  Acceleration = [tex]8.75m/s^2[/tex]

b) Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) Car travels 9.8 m

Explanation:

  Acceleration = Change in velocity/Time

a) Change in velocity = 3.5-0 = 3.5 m/s

   Time = 0.4 seconds

    Acceleration = [tex]3.5/0.4=8.75m/s^2[/tex]

b) Change in velocity = 0 - 3.5 = -3.5 m/s

   Time = 5.6 seconds

   Acceleration = [tex]-3.5/5.6=-0.625m/s^2[/tex]

   Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

 Here v = 0 m/s, u = 3.5 m/s, a = -0.625[tex]m/s^2[/tex]

 Substituting

    [tex]0^2=3.5^2-2*0.625*s\\ \\ s=9.8m[/tex]

  So, car travels 9.8 m

The noble gasses, they are the elements on group 18 of the periodic table and do not usually form compounds. The noble gases are as follows: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Hope this helped :)

The elements that do not ordinarily form compounds are the noble gases. These gases are found in Group 18 of the periodic table and include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Noble gases are extremely stable and inert, which means that under typical circumstances, they do not typically combine with other elements to produce compounds.

They are chemically stable because they have an entire outer electron shell. They are less likely to gain, lose, or share electrons with other atoms due to their entire outer electron shells, which is crucial for the formation of compounds.

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It is given that the length of blade of the turbine is 58 m.

During the motion, the turbine will undergo rotational motion. Hence the radius of the circle traced by the turbine is equal to the length of the blade.

Hence radius r = 58 m.

The frequency of the turbine [f] =14 rpm.

Here rpm stands for rotation per minute.

Hence the frequency of the turbine in one second-

                                                      [tex]f=\frac{14}{60}\ s^-1[/tex]

                                                      [tex]f=0.23333 Hz[/tex]

Here Hz[ hertz] is the unit of frequency.

The angular velocity of the turbine [tex]\omega =2\pi f[/tex]

                                                          [tex]\omega=2*3.14*0.2333[/tex]

                                                          [tex]\omega=1.465124[/tex] radian/second

Now we have to calculate the centripetal  acceleration of the blade.

Let the linear velocity of the blade is v.

we know that  linear velocity v=ωr

The centripetal acceleration is calculated as-

                                                                      [tex]a_{c} =\frac{v^2}{r}[/tex]

                                                                            [tex]=\frac{[\omega r]^2}{r}[/tex]

                                                                            [tex]=\omega^2r[/tex]

                                                                            [tex]=[1.465124]^2 *58[/tex]

                                                                            [tex]=124.5021234 m/s^2[/tex]      [ans]

Centripetal acceleration depends on the rotational speed of object. The required value of the centripetal acceleration of the wind turbine blade is [tex]125.33 \;\rm rad/s^{2}[/tex].

The magnitude of acceleration possessed by any object with rotational motion, such that the direction of acceleration is towards the center, then such acceleration is called centripetal acceleration.

Given data-

The length of the turbine blade is, r = 58 m.

The angular speed of blade is, N = 14 rpm.

Convert the angular speed into rad/s as,

[tex]\omega = \dfrac{2 \pi N}{60}\\\\\\\omega = \dfrac{2 \pi \times 14}{60}\\\\\omega =1.47 rad/s[/tex]

And the expression for the angular acceleration is given as,

[tex]\alpha = \omega^{2} \times r[/tex]

Solving as,

[tex]\alpha = 1.47^{2} \times 58\\\\\alpha =125.33 \;\rm rad/s^{2}[/tex]

Thus, we can conclude that the required value of the centripetal acceleration of wind turbine blade is [tex]125.33 \;\rm rad/s^{2}[/tex].

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psychologist counseling would be the correct answer I believe

Answer:

Clinical psychologist counseling.

Explanation:

Divorce is very difficult time for any family and for the children. Divorcing spouse can be benefited by the psychologist or mental health professional at that difficult time.

It is very helpful for the spouse and children to talk about relations as well as emotions at that time. This will give the person a very effective way to deal up the situation, anger and frustration.

True is your answer.

Hope this helps....

Here current is flowing through the copper wire so this shows that copper is good conductor of electricity.

It is having less resistance as it conducts the current easily

Now a rubber coating on it will protect us from electric shock

So this property shows that rubber is a bad conductor of electricity

It is having large electrical resistance due to which it will conduct no current

Rubber : - No transmittance of electricity

copper :- good transmittance of electricity

Copper is a good conductor of electricity due to its low electrical resistance, while rubber is an insulator that prevents the flow of electric charge. The copper portion of the cable carries the electrical current while the rubber surrounds and isolates it.

Copper wire is a good conductor of electricity because it has a low electrical resistance, allowing electric charge to flow easily through it. This is due to the physical property of copper called low resistivity. On the other hand, rubber is an insulator and does not allow electric charge to flow through it easily due to its high resistivity. Rubber protects you from being zapped by electricity because it prevents the flow of electric charge, acting as a barrier. In a mini stereo speaker cable, the copper portion carries the electrical current while the rubber surrounds and isolates it.

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I think jogging/running/walking because you don't need any equipment and you can structure around it on your own time.

Answer:

I would say walking or running  

Explanation:

Because its simple and you can choose your own pace

Answer: Interneurons.

These interneurons transmit impulses to other neurons and thus form a part of the reflux arc.

here is my answer hope this helps you out allot  UVA radiation is what makes people tan. It penetrates to the lower layers of the epidermis, where they trigger cells called melanocytes