In an EM wave traveling west, the B field oscillates up and down vertically and has a frequency of 95.0 kHz and an rms strength of 7.35×10−9T . Assume that the wave travels in free space.
A) What is the frequency of the electric field?
B) What is the rms strength of the electric field?
C) What is the direction of its oscillation?
The electric field oscillates along the horizontal west-east line.
The electric field oscillates along the horizontal north-south line.
The electric field oscillates vertically.
None of the above.

Answer:

ionic bonds are between metal and nonmetal ions. in these compounds, metal atoms lose electrons to form positive ions (cations ) non-metal atoms gain electrons to form negative ions (anions )

The gravitational force of Earth on the satellite, given that the satellite is launched into orbit 30000 km above sea level is 1.63×10³ N

The gravitaional force between two objects can be obtained by using the following formula:

F = GM₁M₂ / r²

Where

The following data were obtained from he question:

The gravitaional force can be obtained as shown below:

F = GM₁M₂ / r²

F = (6.673×10¯¹¹ × 5.4×10³ × 6.0×10²⁴) / (36400000)²

F = 1.63×10³ N

Thus, the gravitational force is 1.63×10³ N

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Answer:

If you mean for exercising  then, The Treadmill. Purists may claim that treadmill running isn't "real" running. ...

The Elliptical Trainer. ...

The Stair-Climber. ...

The Cross-Country Skiing Simulator. are all  machines that help you practice agility

Explanation:

Answer:

His third law states that for every action or force in nature there is an equal and opposite reaction.

Explanation:

The heavier the books get, the harder it is for Molly to exert enough force to move the cart.

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Answer:

The maximum height reached by the body is 313.6 m

The time to return to its point of projection is 8 s.

Explanation:

Given;

initial velocity of the body, u = 78.4 m/s

at maximum height (h) the final velocity of the body (v) = 0

The following equation is applied to determine the maximum height reached by the body;

v² = u² - 2gh

0 = u² - 2gh

2gh = u²

h = u²/2g

h = (78.4²) / (2 x 9.8)

h = 313.6 m

The time to return to its point of projection is calculated as follows;

at maximum height, the final velocity becomes the initial velocity = 0

h = v + ¹/₂gt²

h = 0 + ¹/₂gt²

h =  ¹/₂gt²

2h = gt²

t² = 2h/g

\(t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 313.6}{9.8} }\\\\t = 8 \ s\)

The changes of energy in an electrical train as it approaches a station and breaks to halt are potential energy → friction → heat and sound

- → friction on train wheels due to brakes reduces KE of train to zero

- → heat and sound to surroundings

Energy, according to scientists, is the capacity for work. The ability to transform energy from one form to another and use it to perform tasks is what makes modern civilization possible. People utilize energy to travel by foot and bicycle, drive vehicles on land and in water, prepare meals on stoves, create ice in freezers, illuminate our homes and workplaces, create goods, and launch people into space.

Energy comes in a wide variety of forms, including:

These energies can be divided into two categories for working energy:

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Answer:

a) 102 meters

b) 14 meters

c) The direction is eastward.

Explanation:

Distance is said to be the length between two points. It is a scalar quantity.

a) The distance moved = 36 + 44 + 22

                                       = 102 meters

b) Displacement is the distance moved in a specified direction.

Representing the distance moved with specific direction as a directed number, 36 meters eastward = +36, 44 meters westward = -44, and 22 meters eastward = +22

/Displacement/ = +36 -44 +22

                         = +58-44

                         = 14

The magnitude of the displacement is 14 meters.

c) The direction is eastward.

So that the magnitude of displacement and his direction is 14 meters eastward.

The time taken for the object to fall the same distance in planet X is determined as 8.5 seconds.

The time taken for the object to fall the same distance on planet X is calculated as follows;

t = √2h/g

where;

t² = 2h/g

gt² = 2h

g₁t₁² = g₂t₂²

t₂² = g₁t₁²/g₂

t₂² = (g₁ x 3.8²) / (0.2g₁)

not e one-fifth = 1/5 = 0.2

t₂² = 72.2

t₂ = √72.2

t₂ = 8.5 seconds

Thus, time taken for the object to fall the same distance in planet X is determined as 8.5 seconds.

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Answer:

55 kg

Explanation:

Formula :

Force = mass × acceleration

=========================================================

Given :

⇒ Force = 220 N

⇒ acceleration = 4 m/s²

===========================================================

Solving :

⇒ 220 N = mass × 4 m/s²

⇒ mass = 220/4

⇒ mass = 55 kg

Answer:

a. y = (tanθ)x - 1/2gx²/(v₀cosθ)²

b. Range R = v₀²sin2θ/g

c. Time of flight T = 2v₀sinθ/g

Explanation:

a. Show that the path followed by the object is parabolic

Let the vertical component of its velocity be v₁ = v₀sinθ and the horizontal component of its velocity be v₂ = v₀cosθ where v₀ = initial velocity of the projectile.

Now, for its vertical displacement Δy = v₁t - 1/2gt²   (1)

Its horizontal displacement Δx = v₂t  (2)

From (2) t = Δx/v₂

Substituting t into (1), we have

Δy = v₁(Δx/v₂) - 1/2g(Δx/v₂)²

= (v₁/v₂)Δx - 1/2g(Δx)²/(v₂)² =

= (v₀sinθ/v₀cosθ)Δx - 1/2g(Δx)²/(v₀cosθ)²  

If we assume the initial position is at the origin, then Δx = x - 0 = x and Δy = y - 0 = y. So,

y = (tanθ)x - 1/2gx²/(v₀cosθ)² .

This is the required equation and it is a quadratic equation in x. Thus, the path followed by the projectile is parabolic.

b. The Range, R

The range, R is obtained when y = 0

So, 0 = (tanθ)x - 1/2gx²/(v₀cosθ)²

[(tanθ) - 1/2gx/(v₀cosθ)²]x = 0

x = 0 or (tanθ) - 1/2gx/(v₀cosθ)² = 0

x = 0 or (tanθ) = 1/2gx/(v₀cosθ)²

x = 0 or (tanθ)(v₀cosθ)² = 1/2gx

x = 0 or x = 2(sinθ/cosθ)(v₀cosθ)²/g

x = 0 or x = v₀²(2sinθ/cosθ)/g

x = 0 or x = v₀²sin2θ/g      [sin2θ = 2sinθ/cosθ]

So its range R = x = v₀²sin2θ/g    

c. Time of flight, T

The time of flight, T is obtained from (1) when Δy = 0 and t = T

So, 0 = v₁T - 1/2gT²

(v₁ - 1/2gT)T = 0

T = 0 or (v₁ - 1/2gT) = 0

T = 0 or v₁ = 1/2gT

T = 0 or T = 2v₁/g = 2v₀sinθ/g

So, the time of flight T = 2v₀sinθ/g

The correct statements include:

option A, B, C, D

The Incorrect statements include:

Different types of electromagnetic radiation are fundamentally different types of waves. (All types of electromagnetic radiation are fundamentally the same type of wave but have different frequencies and wavelengths.)

The only type of electromagnetic radiation that is actually considered light is visible light. (All types of electromagnetic radiation are considered light, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.)

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Answer: A B C D

Explanation: k12 I had this quiz

The resistance of copper wire is 130.1Ω when it is at 70°c if the temperature coefficient of resistance of copper at 0°c is 0.0043/°c.

Given the resistance of copper wire (R1) = 100 Ω

The resistance is at a temperature of (T1) = 0°c.

The temperature change is (T2) = 70°c

The temperature coefficient of resistance of copper at 0°c is = 0.0043/°c.

The resistance at 70°c = R2

We know that Resistance at particular temperature is calculated as:

Rθ = R0(1+αθ)

R2 = 100(1 + 0.0043x70)

R2 = 130.1Ω

The resistance of resistor at 70°c is 130.1Ω

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Given data

The mass of the sparrow is m = 30 g = 0.03 kg

The initial momentum on the sparrow is pi = 0.36 kgm/s

The initial speed of the sparrow is u = 12 m/s

The duration of the time interval is t = 12 s

The magnitude of the constant force is F = 0.02 N

The expression for the final momentum is given as:

Substitute the value in the above equation.

Thus, the final momentum of the sparrow is 0.6 kgm/s.

The things that is happening to the amount of carbon in living things are;

1. Carbon is moving from the living things in the tank into the air when they respirate, and from the air back into plants via photosynthesis

2. The amount of carbon in living things is increasing as plants use the carbon in the atmosphere, and animals eat the plants.

It should be noted that there was a well sealed tank contains air, plants and animals and we know that photosynthesis will actaully take placebecause there is light.

Therer will be carbon from  carbondioxide (CO2) since Living things in the tank release  which implies that Plants  will utilize this carbondioxide  so as to get  carbon-containing food .

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Answer:

zero

Explanation:

Zero force is required to keep it moving at a constant speed

  due to inertia ====>  objects at rest tend to stay at rest and objects moving tend to remain that way unless acted upon by forces

Answer:

12.3°C should be the correct answer

Answer:

12.3

Explanation:

a) The force constant is 2.49 N/m

b) The amplitude is 1.65 m

We know that a spring can be said to be the kind of substance that has a potential energy that has been stored in it and this energy is released to do work when the spring has been pulled.

We have that;

T = 2π√m/K

T = period

m = mass

K = spring constant

Then;

0.84 = 2*3.14√0.447/K

0.84/2*3.14 = √0.447/K

(0.84/2*3.14)^2 = 0.447/K

K  = 0.447/0.0179

K = 2.49 N/m

Then the amplitude is obtained from;

W = 1/2 KA^2

A =√2W/K

A = √2 * 3.4/2.49

A = 1.65 m

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Answer: 0.28 m/s (1 km/hr)

Explanation:

This is an inelastic conservation of momentum question.

First, convert the speed to m/s: 3 km/hr (1000m/1km)(1hr/3600s) = .83 m/s

Then, Momentum before = Momentum after;

Momentum before = m1v1 + m2v2 = 4000(.83) + 8000(0)

Momentum after: (m1 + m2)v3 → (4000 + 8000)v3

Set these equal: 4000(.83) = 12000v3 and solve to get: v3=.28 m/s :)

The current that will flow through the circuit will be 1.7857 amps

Ohm's Law describes the relationship between current, voltage, and resistance. This asserts that, given the temperature is constant, the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.

Given Data

Voltage = 500 decivolts

Resistance = 28ohm

Converting decivolts to volts we have

We can get this byn dividing the value by 10

Voltage = 500/10 = 50Volts

Now, we know that the expression relating current, voltage and resistance is given as

V = IR

Substituting our given data we have

50 = I*28

Divide both sides by 28 we have

I = 50/28

I = 1.7857 amps

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The centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8). Formulae used to find the centre of mass are as follows:x bar = (1/M)*∫∫∫x*dV, where M is the total mass of the system y bar = (1/M)*∫∫∫y*dVwhere M is the total mass of the system z bar = (1/M)*∫∫∫z*dV, where M is the total mass of the systemThe region bounded by y=9-x^2 and y=5/2x, and the z-axis is shown in the attached figure.

The two curves intersect at (-3, 15/2) and (3, 15/2). Thus, the total mass of the region is given by M = ∫∫ρ*dA, where ρ = density. We can assume ρ = 1 since no density is given.M = ∫[5/2x, 9-x^2]∫[0, x^2+5/2x]dAy bar = (1/M)*∫∫∫y*dVTherefore,y bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]y*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]ydA...[1].

The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore,y bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]y*dxdy...[2].

The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.Substituting the values and evaluating the integral, we get y bar = (1/M)*[(9-5/2)^2/2 - (9-(15/2))^2/2]= (1/M)*(25/2)...[3].

Also, the x coordinate of the center of mass is given by,x bar = (1/M)*∫∫∫x*dVTherefore,x bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]x*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]xdA...[4].

The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore, x bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]xy*dxdy...[5].

The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.

Substituting the values and evaluating the integral, we get x bar = (1/M)*[63/8]= (1/M)*(63/8)...[6]Thus, the centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8).

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The maximum velocity of the photoelectron is 4.59 x 10^5 m/s when the surface is illuminated by radiation of 200 nm wavelength.

To find the maximum velocity of a photoelectron, we can use the equation:
maximum kinetic energy of photoelectron = energy of incident photon - work function
The energy of a photon can be calculated using the equation:
energy of photon = (Planck's constant x speed of light) / wavelength
Substituting the given values, we get:
energy of photon = (6.626 x 10^-34 J s x 3 x 10^8 m/s) / (200 x 10^-9 m)
                 = 9.939 x 10^-19 J
The work function is given as 5.0 eV, which can be converted to joules using the conversion factor:
1 eV = 1.602 x 10^-19 J
work function = 5.0 x 1.602 x 10^-19 J
             = 8.01 x 10^-19 J
Substituting these values in the first equation, we get:
maximum kinetic energy of photoelectron = 9.939 x 10^-19 J - 8.01 x 10^-19 J
                                      = 1.929 x 10^-19 J
To find the maximum velocity of the photoelectron, we can use the equation:
maximum velocity of photoelectron = √(2 x maximum kinetic energy of photoelectron / mass of electron)
Substituting the given values, we get:
maximum velocity of photoelectron = √(2 x 1.929 x 10^-19 J / 9.11 x 10^-31 kg)
                                 = 4.59 x 10^5 m/s
Therefore, the maximum velocity of the photoelectron is 4.59 x 10^5 m/s when the surface is illuminated by radiation of 200 nm wavelength.

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Answer:

1) a substance made by mixing other substances together.

2) diverse in character or content.

3) of the same kind; alike.

4) a means of solving a problem or dealing with a difficult situation.

5) a homogeneous noncrystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.

6) the temporary prevention of something from continuing or being in force or effect.

7) having assets in excess of liabilities; able to pay one's debts.

8) the minor component in a solution, dissolved in the solvent.

9) the state or process that occurs when no more of something can be absorbed, combined with, or added.

REFER TO IMAGE ...

Answer: the pressure increases with the amount of water pushing in on all sides of the diver, for example, when you jump into a pool and you head is above water it a little harder to breathe, it is the same way for divers when they are diving at increasingly deep depths, the deeper you are the more water is pressing in on you.

Explanation:

Answer:

She won't have any kenetic energy at the bottom of the hill

Explanation:

The type of ignition that occurs when a mixture of fuel and oxygen encounters an external heat source with sufficient heat or thermal energy to start the combustion process is known as Piloted ignition. The correct answer is option D.

Piloted ignition is a type of ignition that happens when a mixture of fuel and oxygen encounters an external heat source with sufficient heat or thermal energy to start the combustion process. A spark is not needed for this to happen. The external heat source could be a burning cigarette, a spark from an electrical source, or any other heat source that has the ability to produce heat. When a combustible fuel is introduced into a space with air, the mixture becomes flammable when it reaches a certain concentration.

When the fuel-air mixture is heated to a high temperature, the reaction takes place and the fuel ignites. This reaction is piloted ignition. The two other types of ignition are autoignition and kinetic ignition. Autoignition is when a combustible fuel ignites spontaneously due to its high temperature and pressure. It is used in diesel engines. Kinetic ignition is when a high-velocity flame from a spark or other ignition source ignites the fuel. It is used in gasoline engines.

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The angle that Boulevard N makes with Street L north of their intersection is also 75°.

Intersection is a point where two or more lines, curves, surfaces, or objects meet or cross each other. It is a common concept in mathematics, engineering, and everyday life. In mathematics, an intersection is a point where two or more sets of objects meet. In engineering, an intersection is a point where two or more roads, railways, or other transportation routes meet. In everyday life, an intersection is a point where two or more paths, streets, or other routes meet. Intersections are important in transportation, as they are the points where vehicles can change direction or turn around. Intersections are also important in mathematics, as they are the points where two or more lines, curves, or surfaces meet.

This is because the angle formed by two parallel lines is always equal. Since A and L run parallel to each other, the angle formed by Boulevard N and Street L south of their intersection is equal to the angle formed by Boulevard N and Street L north of their intersection. Therefore, the angle that Boulevard N makes with Street L north of their intersection is also 75°.

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your answer is...

C. potassium