A. The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c=3.0108m/s)B. The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c=3.0108m/s)

Answer:

c i think

Explanation:

f(1) = v/2L, so fundamental frequency of the system = 343 m/s/2(7/3)L = 343 m/s*(7/6)L.

The fundamental frequency can be computed as 204.25 Hz.

343 m/s is the speed of sound BTW.

Answer:

Explanation:

V

R t t

V t Q P t t

R R

= ⋅ =

=

⋅ ⋅

= = = ⋅ ⇒ = =

The ratio of the  deflection when each galvanometer is connected with the cell is 13:12.

A moving coil used in a galvanometer is used to measure a small electrical current or a function of the current. The current's forces generate mechanical rotational forces that cause the deflection.

Given that:

EMF of the cell: e = 25 volt.

Internal resistance: r = 50 ohm.

Current flows through first galvanometer: I₁ = 25 /( 10+50) amp = 5/12 amp.

Current flows through second galvanometer: I₂ = 25 /( 600+50) amp = 5/130 amp.

Number of turns in first galvanometer: n₁ = 50

Number of turns in second galvanometer: n₂ = 500

As all other conditions of the two galvanometers are same; the ratio of the deflection  when each galvanometer is connected with the cell =

n₁I₁ : n₂I₂

= 50 (5/12) : 500(5/130)

= 1/12 : 1/13

= 13 : 12.

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Answer:

  V = 5 cm³

Explanation:

In this exercise the volume (Vo = 0.1 cm³) of each drop is indicated, requesting the volume of 50 drops

                      V = V₀    #_drops

                      V = 0.1   50

                      V = 5 cm³

Answer:

\(V_{50}=5cm^3\)

Explanation:

From the question we are told that:

Volume of liquid in burette \(V_b=14cm^3\)

Volume of drop of liquid \(V_d=0.1cm^3\)

Number of drops \(n=50\)

Generally the equation for volume of 50 drops V_{50} is mathematically given by

 \(V_{50}=V_d*n\)

 \(V_{50}=0.1*50\)

 \(V_{50}=5cm^3\)

Therefore the volume of the 50 drops

  \(V_{50}=5cm^3\)

Answer:

a.  Generator

Explanation:

Answer:

A

Explanation:

A battery derives its energy chemically. D is not the answer.

C develops its energy by burning fuel and transferring the heat energy to make water into steam which is chemical/mechanical. Not C

B A Tesla Coil produces a very high voltage and a low current. Not B.

The answer left is A. It converts mechanical energy into electrical energy. It is the only device listed that does this.

Answer:

The DART mission proved to be successful. Its ultimate goal was to alter the trajectory of the asteroid Dimorphous. It was successful because the asteroid's trajectory was in fact altered. This mission is the first mission that intentionally altered the trajectory of a non man made object in space.

Answer:

its speed will increase to 8 newtons allowing its position to dramatically change.

The main factor that determines the stages of a star after the main sequence is the star mass. Depending on the mass, stars will develop as average stars -low mass- or giant stars -high mass-.

The star cycle is the sequence of changes that a star undergoes throughout its existence

Stars are born from the nebula, which is dust and gas particles condensation due to the gravity effect in the interstellar clouds.

These stellar clouds collapse and compose smaller regions, each of which later contracts and compose the stellar cores. This is a more advanced level of condensation.

Stelar cores are protostars that contract and increase their temperature until nuclear reactions occur. Hydrogen is converted into Helium and the new star gets born.

This new star is in its main sequence, which is the equilibrium point between gravity and nuclear fusion, which helps the star keeps stable as long as the fuel lasts.

Stars spend most of their lives in the main sequence until all hydrogen turns into helium and there is no more fuel left.

At this point, the star is a subgiant, and its core begins its contraction, increasing the star's temperature.

The star increases in size and luminosity, turning into a giant.

After the subgiant stage, the star enters a giant phase. The star can reach a size up to 100 times its current size.

When the core reaches a certain temperature, helium turns into carbon.

The following events depend on the star mass.

When average-sized stars run out of fuel, the red giant begins to disintegrate, losing its outer layers and exposing its core, which will become a white dwarf.

When fuel is over in the star, the gravitational collapse produces an explosion originating the supernova.

This neutron star is a celestial body that remains as a remnant after the explosion giving rise to a supernova.

In these cases, if the star core has a mass > 3 solar masses, the star collapses into a black hole.

In conclusion, the main factor that determines the stages a star follows after the main sequence is the star mass. Depending on the mass, stars will develop as average stars -low mass- or giant stars -high mass-.

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Answer:

Batteries are systems that store chemical energy and then release it as electrical energy when they are connected to a circuit. Batteries can be made from many materials, but they all share three main components: a metal anode, a metal cathode and an electrolyte between them. The electrolyte is an ionic solution that allows charge to flow through the system. When a load, such as a light bulb, is connected, an oxidation-reduction reaction occurs that releases electrons from the anode while the cathode gains electrons

Explanation:

Answer:

The correct answer is option D, Using an Electric mixer ( i hope this is the correct answer to what you are talking about because you didn't have any options but i gave out almost the same question to my students.)

Explanation:

Physical fitness is assured by activities in which our body is doing some kind of physical movements or exercise. In case of “walking to work “ the body is compelled to move or walk, in case of “carrying boxes up and down stairs” lot of physical work is done in both carrying the boxes and moving up and down the stairs, in the same way in case of “shoveling snow” some physical efforts are required to shovel the snow. But in case of using a  electric mixer, the only work being done is the “pressing of ON/OFF button”. Thus , "using an electric mixer" will have the LEAST effect on your level of physical fitness

The foot-in-the-door technique is a persuasion strategy where a small request is made initially to increase the likelihood of compliance with a larger request later on.

A daily-life example of the foot-in-the-door technique is when a salesperson offers a free product sample and later asks for a purchase of the full-sized product.

The foot-in-the-door technique is based on the principle of consistency, which suggests that people have a tendency to behave in ways consistent with their previous actions or commitments.

By starting with a small request that is likely to be agreed upon, the person is more likely to feel a sense of internal consistency and agree to a larger request later.

In the example, the salesperson initially asks you to try a free sample of a product. By accepting the sample, you have taken a small step towards showing interest in the product. The salesperson then uses this initial agreement to follow up with a larger request, which is to purchase the full-sized version of the product.

Due to the principle of consistency, you may be more inclined to comply with the larger request as you have already shown a positive response to the initial request.

Overall, the foot-in-the-door technique leverages the human tendency for consistency to increase the likelihood of compliance with a larger request by starting with a smaller, more easily agreed-upon request.

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Explanation: White light is all colors of light in one, so when white light passes through a prism, the light gets refracted and breaks apart into all of the colors on the visible light spectrum.

Answer: It's D

Explanation:

The type of lens that causes parallel rays of light to converge is a converging or convex lens. In the attached picture below, the converging lenses are options I, III, and V.

A converging lens is a type of lens that, just like the name says, converges rays of light that are traveling parallel to its axis. They are relatively thicker in the middle and thinner on the edges.

In the attached picture below, options I, III, and V all have a thicker middle, so these all are covering lenses. Options II and IV are relatively thinner in the middle, making them diverging lenses.

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The dimensions of the lightest open-top right circular cylindrical can be  6.82cm.

The following is the formula to get the volume of something like a hollow cylinder: The volume of a hollow cylinder is equal to (R2 - r2) h cubic units, where "R" denotes the cylinder's outer radius, "r" its inner radius, and "h" its height. Similar to a prism but having circular bases, a cylinder is a 3-D shape.

Given, volume of the cylinder = 1000cm³

volume of cylinder = πr²h

The bottom and sides are included in the surface area:

SA = πr²+2πrh

The second equation may be written as, after solving the first equation for h.

 SA = πr² +2πr(V/(πr²)) = πr² +2V/r

Where the derivative is 0, the smallest area for the volume will be discovered.

 d(SA)/dr = 2πr -2V/r² = 0

The can radius is thus,

r = ∛(V/π)

and it's height, h = V/(π(V/π)^(2/3)) = ∛(V/π) = r

The dimensions for the specified volume are

r = h = ∛(1000/π) ≈ 6.82cm

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Answer:

True

Explanation:

Answer:

4 km/min

Explanation:

Applying

S = (d₂-d₁)/(t₂-t₁).............. Equation 1

Where S = speed of the car, d₁ = Intial reading of the odometer, d₂ = Final reading of the odometer, t₁ = initial time, t₂ = final time.

From the question,

Given: d₁ = 68420 km, d₂ = 68540 km, t₁ = 9:00 am, t₂ = 9:30 am

Substitute these values into equation 1

S = (68540-68420)/(9:30-9:00)

S = 120/30

S = 4 km/min.

Answer:

106.4V

Explanation:

Voltage = resistance * current

The speed of the cart after the man starts running is 5.7 m/s to the right.

The total momentum of the system is conserved, therefore the total momentum before the man starts running is equal to the total momentum after he starts running.

Therefore, we can use the equation:

pbefore = pafter

where:

pbefore is the momentum of the system before the man starts running and pafter is the momentum of the system after he starts running.

Before the man starts running, the momentum of the system is:

pbefore = m1v1 + m2v2

where:

m1 and v1 are the mass and velocity of the cart, and m2 and v2 are the mass and velocity of the man.

pbefore = (1000 kg)(5.0 m/s) + (70 kg)(0 m/s)

pbefore = 5000 kg · m/s

After the man starts running, the momentum of the system is:

pafter = m1v1 + m2v2

where:

m1 and v1 are the mass and velocity of the cart, and m2 and v2 are the mass and velocity of the man.

pafter = (1000 kg)(v) + (70 kg)(-10 m/s)

pafter = 1000v - 700 kg · m/s

Since pbefore = pafter, we can set the two expressions for momentum equal to each other:

5000 kg · m/s = 1000v - 700 kg · m/s

Solving for v:

v = (5700 kg · m/s) / (1000 kg)v = 5.7 m/s

Therefore, the speed of the cart after the man starts running is 5.7 m/s to the right.

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Answer:

Explanation:

because Oxalic acid is present in spinach

A. The probe's Mach number is 92.593.

B. The angle of the shock wave relative to the direction of motion is approximately 0.678 degrees.

A. First, we need to convert the initial speed to meters per second:

15,000 km/h = 4,166.67 m/s

The Mach number is defined as the ratio of the object's speed to the speed of sound:

Mach number = object's speed / speed of sound

Mach number = 4166.67 m/s / 45 m/s = 92.593

B. The angle of the shock wave relative to the direction of motion can be calculated using the formula:

sin(θ) = 1 / Mach number

sin(θ) = 1 / 92.593

θ = sin^-1(1 / 92.593) = 0.678 degrees

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The only moon in our solar system to spin in a direction opposite of its planet's rotation is Triton. Triton is the largest moon of Neptune and has a retrograde orbit, meaning it orbits in the opposite direction of Neptune's rotation. This makes Triton unique among the large moons in our solar system.

There are a few theories about how Triton came to be in a retrograde orbit. One theory is that Triton was once a dwarf planet that was captured by Neptune's gravity. Another theory is that Triton and Neptune formed together from the same cloud of dust and gas.

Whatever the reason for Triton's retrograde orbit, it is a fascinating and unique object in our solar system.

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No. A dog chasing its tail is just an animal running around in circles.

The dog's MOTION, however, IS accelerated motion, since the DIRECTION of its motion is constantly changing.

A a dog chasing its tail cannot be considered as acceleration.

Acceleration is the rate at which velocity changes over time, both in terms of speed and direction.

A point or object moving in a straight line is accelerated if it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is constantly changing.

For example, if a car accelerates as it turns a corner at constant speed, it is doing so because its direction is changing.

The faster you turn, the faster you accelerate. When velocity changes in magnitude (increase or decrease in speed), direction, or both, there is an acceleration.

Thus, as there is no change in either speed or direction in scenario in which a dog chases its tail, it is not considered as acceleration.

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The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is lesser. The correct answer is option A.

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Explanation:

Given that,

Current passes through our chest is 0.3 A

The current persists for 3.06 minutes

We need to find the number of conduction electrons pass through your heart. Charge flowing divided by time equals current. Also, q = ne

\(I=\dfrac{ne}{t}\\\\n=\dfrac{It}{e}\\\\n=\dfrac{0.3\times 3.06\times 60}{1.6\times 10^{-19}}\\\\n=3.44\times 10^{20}\)

So, \(3.44\times 10^{20}\) electrons would pass through your heart.

(a) The distance travelled by the object is  100 m.

(b) The displacement of the object in time interval between t = 0 s and t = 10 s is 60 m.

(a) The distance travelled by the object is calculated from the total area of the curve.

total distance = area of triangle 1 + area of triangle 2 + area of rectangle.

total distance = (¹/₂ x base x height)₁ +  (¹/₂ x base x height)₂ + length x width

total distance = (¹/₂ x 6 s x 20 m/s) +  (¹/₂ (8 - 6) 20) + (10 - 0)(10 - 8)

total distance =  60 m + 20 m + 20 m

total distance = 100 m

(b) The displacement of the object in time interval between t = 0 s and t = 10 s is calculated as follows;

displacement = final position - initial position

displacement =  (¹/₂ x base x height)₁ +  (¹/₂ x base x height)₂ + length x width

displacement = (¹/₂ x 6 s x 20 m/s) +  (¹/₂ (8 - 6) (-20)) + (10 - 0)(10 - 8)

displacement = 60 m - 20 m + 20 m = 60 m

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An astronaut can jump approximately 6 times higher on the Moon than on Earth if their takeoff speed remains the same in both locations.

The height an astronaut can jump is determined by the initial speed and the acceleration due to gravity. Denote the initial speed as "v" and the acceleration due to gravity as "g".

On the Moon, the gravitational acceleration (g_moon) is about one-sixth of that on Earth (g_earth). Therefore, it can be written:

g_moon = g_earth / 6

Now, consider the maximum height an astronaut can reach when jumping vertically. This height can be calculated using the following formula:

h = (v^2) / (2g)

For the astronaut to have the same initial speed in both locations, assume "v" remains constant. Therefore, the height on the Moon (h_moon) can be expressed as:

h_moon = (v^2) / (2g_moon)

Similarly, the height on Earth (h_earth) can be expressed as:

h_earth = (v^2) / (2g_earth)

Now, compare the heights on the Moon and Earth:

h_moon / h_earth = [(v^2) / (2g_moon)] / [(v^2) / (2g_earth)]

Simplifying the equation:

h_moon / h_earth = g_earth / g_moon

Substituting the given ratio of gravitational accelerations:

h_moon / h_earth = g_earth / (g_earth / 6)

h_moon / h_earth = 6

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Answer:

Her altitude as she crosses the bar, h₂ is approximately 6.1 m

Explanation:

The given parameters of the motion of the pole vaulter are;

The mass of the pole vaulter, m = 57 kg

The speed with which the pole vaulter is running, u = 11 m/s

The speed of the pole vaulter when she crosses the bar, v = 1.1 m/s

The acceleration due to gravity, g = 9.8 m/s²

From the total mechanical energy, M.E. equation, we have;

M.E. = P.E. + K.E.

Where;

P.E. = The potential energy of the motion = m·g·h

K.E. = The kinetic energy of the motion = 1/2·m·v²

By the principle of conservation of energy, we have;

The change (loss) in kinetic energy, ΔK.E. = The change (gain) in potential energy, ΔP.E.

ΔK.E. = 1/2·m·(v² - u²)

ΔP.E. = m·g·(h₂ - h₁)

Where;

h₁ = The ground level = 0 m

h₂ = The altitude with which she crosses the bar

∴ 1/2·m·(v² - u²) = m·g·(h₂ - h₁)

(h₂ - h₁) = (v² - u²)/(2·g) = (11² - 1.1²)/(2·9.8) = 6.11173469388

h₂ = 6.11173469388 + h₁ = 6.11173469388 + 0 = 6.11173469388

h₂ = 6.11173469388

Her altitude as she crosses over the bar, h₂ ≈ 6.1 m.