HELP HELP, this should be pretty easy

Where does all of earth’s atmosphere energy come from

The maximum electric field strength is f=1.98×10⁵

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by :

B=1.2×10⁶ sin[2π(Z/240-10⁷t/8)].....(1)

The general equation of the magnetic field wave is given by :

B=B°sin(kz-wt) ....(2)

Equation (1) is in form of equation (2), if we compare equations (1) and (2) we find that,

w=10⁷/8

We need to find the frequency of the wave. It is given by :

f=w/2π

f=10⁷/8×2π

f=1.98×10⁵ Hz

So, the frequency of the wave is f=1.98×10⁵ Hz.

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The voltage across the inductor is 0 volts (c) because the inductor in a circuit reaches a steady-state condition.

When the switch in a circuit is closed for a long time, the inductor reaches a steady state. In this steady state, the inductor behaves like a short circuit, causing the voltage across it to be zero volts. This occurs because inductors resist changes in current flow. Initially, when the switch is closed, the inductor resists the sudden change in current, causing a back-emf to be generated. However, as time goes on and the current stabilizes, the inductor no longer opposes the flow of current, resulting in a voltage drop of zero volts across the inductor.

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Jack and jill travel up a hill at a speed of 2 mi/h. They travel back down the hill at a speed of 4 mi/h. Their average speed for the entire trip is 8/3 mi/h

The average speed is the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity

Let x be the distance of hill from one side.

⇒ Distance for round trip = 2x

Let t1 and t2 be the time taken by them when going and returning back respectively.

Total time taken for round trip = t1+ t2

we have,

speed = distance/ time

⇒time = distance/speed

so, t1 = x/2

t2= x/4

Average speed for round trip = total distance/ total time

\(average speed = \frac{2x}{ \frac{x}{2} + \frac{x}{4} } \)

= 8/3 mi/h

therefore, Their average speed for the entire trip is 8/3 mi/h.

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A typical plastic water or soda bottle is formed by: C. blow molding.

In Science, a synthetic sling is sometimes referred to as a synthetic lifting strap or synthetic rigging sling and it can be defined as a tool that is covered with a protective jacket and made from a synthetic material such as polyester or nylon, especially through a process known as molding.

This ultimately implies that, a synthetic sling is designed and developed for lifting loads because it is flexible and has a lightweight.

In this context, we can logically blow molding is a technique that can be used for the formation of a typical plastic water or soda bottle.

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Explanation:

It is given that, a cross-country skier moves 32 meters westward, then 54  meters eastward, and finally 68 meters westward.

The attached figure shows the whole scenario. He starts walking 32 m west and finally it walks 68 m west.

Let west is negative and east is positive.

Displacement = final position - initial position

= -68 - (-32)

= -36 m

The magnitude of displacement is equal to 30 m westwards.

The fixed angular speed, w is 33.774rpm

The angular speed is a measure of how quickly the central angle of a spinning body changes with respect to time. The angular speed formula is the link between angular speed and linear speed, as well as a few angular speed difficulties.

Msanjay = Mting = m = 25kg

M= 150kg

R = 3/2m = 1.5m

r = 0.35m

w = 21 rpm

The initial moment of Inertia

Ii = (MR²/2 + MR² + MR²)

The final moment of Inertia

If = (MR²/2 +mr² +mr²)

From angular-momentum conservation

We know that

I final = I initial

Ifw = Ii wₙ

(MR²/2 +2mr²)w = (MR²/2 + 2MR²)wₙ

substituting the value in the above equation we get,

(174.875)w = 281.25 *21

w = 33.774rpm

Thus, the fixed angular speed, w is 33.774rpm

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Answer:

An electrically polarized object can have zero net charge, while a charged object cannot have zero net charge.

I hope this helps :D

Answer:

When displacement vectors are added, the result is a resultant displacement. But any two vectors can be added as long as they are the same vector quantity. If two or more velocity vectors are added, then the result is a resultant velocity. If two or more force vectors are added, then the result is a resultant force.

Answer:

Hence, option (A) is correct answer.

Explanation:

The average force exerted as the displacement from 0 to x changes is 12kx. W = 12kx² is the work done when stretching or compressing a spring a distance x from its equilibrium position.

The Hooke's Law Calculator employs the formula Fs = -kx, where F is the spring's restoring force, k is the spring constant, and x is the displacement, or distance the spring is stretched. Hooke's Law states that when a spring is stretched, the force exerted is proportional to the increase in length from the equilibrium length. The spring constant can be calculated as follows: k = -F/x, where k is the spring constant. The Young's modulus (E) is a material property that indicates how easily it can stretch and deform. It is defined as the ratio of tensile stress () to tensile strain ().

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Explanation:

50 meters north in 10 seconds.

speed = distance ÷ time = 50 meters ÷ 10 seconds = 5m/s

Answer:

False

Explanation:

Rolling friction takes place when an object rolls on the surface. Sliding friction takes place when two surfaces are rubbed against each other. Rolling friction is much less than sliding friction for same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them.

Answer:

MRI and Radio telescopes

MRI and radio telescopes would be unaffected by satellites that are not working properly.

The longest wavelengths in the electromagnetic spectrum are found in radio waves, which typically have frequencies of 300 gigahertz (GHz) and lower. The wavelength for 300 GHz is 1 mm, which is shorter than a grain of rice, while the wavelength for 30 Hz is 10,000 km (6,200 miles) (longer than the radius of the Earth).

Radio waves move at the speed of light in a vacuum, as do all electromagnetic waves, and at a nearly identical speed in the Earth's atmosphere.

Among the given options, space communication and television broadcasting television broadcasting and GPS  and  radio telescopes and space communication​ are affected by satellites that are not working properly because they are operated by satellite technology.

Hence, only MRI and radio telescopes would be unaffected by satellites that are not working properly.

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Answer:

The value in m/s \(v_{a} = 111 \ m/s \)

The value in km/h \(v_{a} = 400\ km/h \)

Explanation:

Generally the average velocity of the helicopter is mathematically represented as

\(v_{a} = \frac{\Delta D}{ t}\)

substituting \(3.33 km = 33.3*10^3\ for\  \Delta D\) and  30.0 s for  t

We have

         \(v_{a} =  \frac{33.3 *10^{3}}{ 30}\)

=>     \(v_{a} =  111 \  m/s \)

Now converting to km/h

      \(v_{a} =  111  *  \frac{3600  *\frac{s}{h} }{1*10^{-3} *\frac{km}{m}} \)

=>  \(v_{a} = 400\  km/h \)

To find

Acceleration is a change in what quantity Over time?

Explanation

Acceleration is defined as the change in velocity with respect to time interval.

Conclusion

The required quantity is

A. speed

The magnitude of the magnetic field at the center of a coil depends on various factors such as the number of turns in the coil, the current flowing through it, and the geometry of the coil.

The magnitude of the magnetic field at the center of a coil can be approximated using the formula for the magnetic field at the center of a circular loop. For an idealized scenario with a circular coil carrying a current I, the magnitude of the magnetic field at the center can be given by:

B = (μ₀ * N * I) / (2 * R)

Where B is the magnetic field magnitude, μ₀ is the permeability of free space (a constant value), N is the number of turns in the coil, I is the current flowing through the coil, and R is the radius of the coil.

This formula demonstrates that the magnetic field at the center of a coil is directly proportional to the number of turns and the current flowing through the coil. It is inversely proportional to the radius of the coil. By adjusting these parameters, the magnitude of the magnetic field at the center of the coil can be controlled.

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( GOOD EVENING )

1) WHAT IS YOUR PHILOSOPHY IN LIFE?

➢My philosophy on life is that you should live while you are alive and you should give others that same privilege. We shouldn’t judge people for the choices they make, because we all make bad decisions. You should do what you want with your life, as long as it makes you happy and causes no harm to others. Happiness is all we can hope for in this world and we have to strive to achieve it. We should help people when we can and graciously accept failures when we have to.

2) HOW DO YOU THINK THE PEOPLE AROUND YOU HAVE INFLUENCED YOUR WAY OF THINKING AND SHAPED YOU INTO THE PERSON THAT YOU ARE TODAY?

➢ There way of influencing me might be bad but i've learned from it,they shout at me whenever i did wrong yet it encourage me to do more about my doings and to make it right,to choose the right path and remove the wrong path.

3) WITH THAT BEING SAID,WHAT ARE YOUR GOALS IN LIFE?

➢ To finish my study,make my family proud,have a nice job,have my own house and car,have my own money give back the help that my family do,and be a successful woman with a good heart.

- Philippines

Answer:

1. Speed

Explanation:

"how far an object moves in a certain amount of time"

"how far an object moves"- distance

"In a " - over

"certain amount of time" - time

Distance over time is speed.

The speed of an object is the distance the object travels in one unit of time.

Hope I Helped, Feel free to ask any questions to clarify :)

Have great day!

           -Aadi x

Test which should the golf pro use is a)paired t-test for means. So, correct option is a.

A paired t-test is the test performed to check whether the mean of two unique arrangements of perceptions is equivalent or the distinction between them is zero. It is otherwise called a reliant or related t-test. A matched t-test is one of the two sorts of test t-tests which are utilized to look at the normal or mean of two populaces.

The distinction in two examples that might happen while ascertaining the mean is a direct result of the irregular opportunity or testing blunder. The two examples on which the matched t-test is tried is connected by some quality like similar number of individuals or things or conditions. The utilizations of this test are in the exploration areas of science, business and brain research.

Hence, correct option is a.

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(Complete question) is:

A golf pro wants to determine if Titleist Pro V1 golf balls  travel farther, on average, than Callaway Chrome Soft golf balls . A robot hits 9 of each ball, selected at random, and the distance traveled is measured. Assume the distances traveled are normally distributed. The average distance traveled by the 9 Titleist Pro V1 golf balls is 261.1 yards with standard deviation 10 yards, and the average distance traveled by the 9 Callaway Chrome Soft golf balls is 249.3 yards with standard deviation 12 yards.

Which test should the golf pro use to determine if Titleist Pro V1 golf balls travel a longer average distance than Callaway Chrome Soft golf balls?

a. paired-t test for means

b. paired-z test for means

c. Ottest for proportions

d. test for means

Yes, we can use proportionality to solve this problem. The second child is located 1.30 m from the pivot.

According to the law of balance, the product of the mass and the distance from the pivot on either side of the seesaw should be equal. In other words, if we multiply the mass of the first child by their distance from the pivot, it should be equal to the product of the mass of the second child and their distance from the pivot.
Therefore;
mass1 * distance1 = mass2 * distance2
Given,

mass1 = 26.0 kg and distance1 = 1.60 m for the first child,

mass2 = 32.0 kg for the second child,

we can solve for distance2;
26.0 kg * 1.60 m = 32.0 kg * distance2
Now, we can find the distance2;
41.6 = 32.0 * distance2
distance2 = 41.6 / 32.0
distance2 ≈ 1.30 m
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The answer to the given question is option C: 40.4°F. Let's see the explanation below.How to find the temperature difference across a properly operating electric furnace?

]We know that the temperature difference across a properly operating electric furnace is given by:ΔT = (Q / (1.08 * CFM))where,Q is the rate of heat input in BTU/hr,1.08 is the factor to convert CFM to lb/min,and CFM is the rate of air flow in cubic feet per minute.So, here,ΔT = (Q / (1.08 * CFM))

Given,The rate of heat input = 10 kW = 34,120 BTU/hrThe rate of air flow = 900 CFMPlugging these values in the above equation, we get:ΔT = (34,120 / (1.08 × 900))ΔT = 40.4°FTherefore, the temperature difference across a properly operating electric furnace that is using a 10-kW electric heater and is moving 900 cfm of air is 40.4°F. Hence, the main answer is option C.

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The temperature difference across the electric furnace is approximately 30.2°F (option A).

To calculate the temperature difference across the electric furnace, we can use the formula:

Temperature difference (ΔT) = Heat (Q) / (Airflow rate * Specific heat capacity * Density)

First, let's convert the power of the electric heater from kilowatts (kW) to watts (W):

10 kW = 10,000 W

Next, we need to determine the specific heat capacity of air. Typically, it is around 0.24 BTU/lb°F.

Since the given airflow rate is in cubic feet per minute (cfm), we need to convert it to pounds per minute (lb/min) using the density of air. The density of air at standard conditions is approximately 0.075 lb/ft³.

Converting 900 cfm to lb/min:

900 cfm * 0.075 lb/ft³ = 67.5 lb/min

Now we can substitute the values into the formula:

ΔT = 10,000 W / (67.5 lb/min * 0.24 BTU/lb°F * 0.075 lb/ft³)

Simplifying the equation:

ΔT = 10,000 W / (67.5 * 0.24 * 0.075) (lb/min * BTU/lb°F * lb/ft³)

Calculating the result:

ΔT ≈ 30.2°F

Therefore, the temperature difference across the electric furnace is approximately 30.2°F, which corresponds to option A.

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Answer:

43.4 N (newton)

Answer:

Like any moving object, the motion of an object in free fall can be described by four kinematic equations. The kinematic equations that describe any object's motion are:

D = vit + 1/2 at2    

(vi +vf)/2 = D/t

a = (vf - vi)/t          

vf2 = vi2 + 2aD

D = displacement

a = acceleration

t = time

vf = final velocity

vi = initial velocity

Explanation:

Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling. Velocity is defined as gravity x time.

The kinetic equation is the evolution equation of the distribution function. It is to the distribution function what Newton's second law is to an individual particle. It is deduced from this fundamental law. It has the following general form: ∂ t f + v .

Answer:

The distance traveled is 24 meters but the change in position is 0 meters because the person comes back to the same point.

Explanation:

To be straight it is 24 meters.

Answer:

Explanation:

(a) Electromagnetic waves travels at the speed of light = 3.0 x \(10^{8}\) m/s.

v = fλ

where v is the velocity of the wave, f is the frequency, and λ wavelength.

So that;

λ = \(\frac{v}{f}\)

  = \(\frac{3.0*10^{8} }{87.9*10^{6} }\)

  = 3.413 m

ii. Enegy of the wave can be determined by;

E = hf

where h is the Planck's constant and f the frequency of the wave.

E = 6.626 x \(10^{-34}\) x 87.9 x \(10^{6}\)

  = 5.82 x \(10^{-26}\) J

(b) Refractive index of water = \(\frac{velocity of light in air}{velocity of light in water}\)

velocity of light in water = 1.33 x 3.0 x \(10^{8}\)

       = 3.99 x \(10^{8}\) m/s

The correct option is B, The magnetic flux linked of the coil will increase because the magnitude of the magnetic field is increased.

While the magnetic subject within the place is changed or the place via which the magnetic area strains passes thru the coil is changed, there is a trade in the flux linked with the coil.

The expression for the magnetic flux related with a coil in a magnetic discipline is given as:

\(\phi_{B} = BAcos \theta\)

Here, B is the magnetic field, A is the area of coil and \(\theta\) is the angle.

Magnetic flux is defined as the number of magnetic field lines that pass through a surface, perpendicularly or at an angle. The magnetic flux is directly proportional to the strength of the magnetic field and the area of the surface it passes through. It is denoted by the symbol Φ and is calculated using the formula Φ = B.A.cosθ.

Magnetic flux plays an important role in many technological applications, such as electric motors, generators, transformers, and magnetic sensors. By controlling magnetic flux, these devices can convert electrical energy into mechanical energy or vice versa. Understanding magnetic flux is also essential in the study of electromagnetism and the behavior of materials in magnetic fields.

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Complete Question:-

You hold a wire coil so that the plane of the coil is perpendicular to a magnetic field  \(\vec{B}\).

Part A

If the magnitude of \(\vec{B}\) increases while its direction remains unchanged, how will the magnetic flux through the coil change?

Check all that apply.

a. The flux is unchanged because the position of the coil with respect to  \(\vec{B}\) is unchanged.

b. The flux increases because the magnitude of \(\vec{B}\) increases.

c. The flux decreases because the magnitude of \(\vec{B}\) increases.

d. The flux is unchanged because the surface area of the coil is unchanged.

Answer:

The angle of launch is 52.49 Degree.

Explanation:

The Range R and Height H of a thrown object is calculated using the formula,

R=V₀² sin(2φ)/g

H=V₀²sin²(φ)/g

From these equations it can be written,

V₀²=R g/ sin(2φ)

V₀²=H g/ sin²(φ)

These values are equal so it can be written by equating these equations,

R g/sin(2φ)=H g/sin²(φ)

tan(φ)= 2H/R

Given H=72.3 m and R=111 m, the angle of launch is,

tan(φ)= 2*72.3/111

φ= 52.49 Degree.

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The magnitude of the force on the calcium ion is 1.0 x 10^7 N/C * e = 1.6 x 10^-19 N.

Magnitude is a measure of the size or strength of a physical quantity, such as size, brightness, or intensity. Magnitude can be measured in terms of intensity, size, brightness, or a combination of those criteria. For example, the magnitude of an earthquake is usually determined by measuring the intensity of the seismic waves that are generated by the earthquake. Magnitude is also used to measure the brightness of stars, with the brightest stars being given the highest magnitude.

The magnitude of the force on a calcium ion with charge +e is equal to the field strength multiplied by the charge of the ion. Thus, the magnitude of the force on the calcium ion is 1.0 x 10^7 N/C * e = 1.6 x 10^-19 N.

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