electro magnetic force 339f













the curent leading intoan electromagnet

The phenomenon of echo of sound waves is due to reflection. The correct answer is Option A.


Echo is the reflection of sound waves off a surface. When sound waves hit a surface, they bounce back or reflect off that surface, creating an echo. This is similar to how light reflects off a mirror.

The reflected sound waves can be heard as an echo if the distance between the source of the sound and the reflecting surface is large enough for the reflected sound to be heard after the original sound. The reflection of sound waves is also what allows us to hear our own voices when we speak in a room with hard surfaces, such as a bathroom or an empty room.

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Answer:

infinity

Explanation:

this is because time is irrelevant

Answer:

Ethical Guidelines for Research With Human Subjects

Participation Must Be Voluntary.

Researchers Must Obtain Informed Consent.

Researchers Must Maintain Participant Confidentiality

Explanation:

Basta Yun na yan correct me if I'm wrong hehehhe

Answer:

Elements are arranged in the table by increasing atomic number.

Explanation:

In the modern periodic table, each element is represented by its chemical symbol. The number above each symbol is its atomic number.

Answer:  Make the frequency higher for number 1 and have the same amplitude.

Explanation: Wavelength and frequency are directly related so if you change one of those then you can't keep the other one the same. You would need to raise the frequency which would make 1 louder and keep amplitude the same for both so that 1 is louder.

To make the sounds match in pitch while making sound wave 1 louder than sound wave 2 : Increase the frequency for wave #1 while setting their amplitudes at the same value

The wavelength of a sound wave is inversely proportional to its frequency therefore when the frequency of wave 1 is increased its wavelength decreases with equal proportion.

Since the increase in frequency results to a decrease in wavelength. therefore to make wave 1 louder, both waves we will have to set the amplitude values of the waves at the same amplitude.

Hence we can conclude that to make the sounds match in pitch while making sound wave 1 louder than sound wave 2 ; Increase the frequency for wave #1 while setting their amplitudes at the same value.

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Answer: When the worker is on the top rung

Explanation: When the ladder was initially resting on the wall, the torque from the normal reaction on ladder from the horizontal surface is equal to the torque from the vertical surface on ladder.

The weight of the worker produces a torque which is in the direction of the torque from the normal reaction on ladder, produced by the vertical surface. Therefore for the ladder to stay in rotational equilibrium, the torque on ladder from the normal reaction produced by the horizontal surface must increase.

This increase is possible when the worker is on the lower rung, but as the worker goes high, the magnitude of normal reaction from the vertical surface would increase, thereby increasing the risk of slipping of ladder.

The moment of inertia of a book with three symmetry axes through its center (diagonal, horizontal, and vertical), all mutually perpendicular, would be smallest about the axis that is perpendicular to the book's largest surface area.

This is because the moment of inertia is a measure of an object's resistance to rotational motion, and the axis perpendicular to the largest surface area will have the smallest rotational inertia.

The book's moment of inertia would be smallest about the horizontal axis. This is because the distribution of mass is closer to the horizontal axis, leading to a smaller moment of inertia compared to the diagonal and vertical axes.

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Answer:

Explanation:

p.E=mgh

P.E=0.124*10*11.2

p.E=13.888j

Answer:

Explanation:

By makingthe elctro fleild into a mass - field

Answer:

42.69J

Explanation:

The question is not complete, here the complete one

A 2.3 kg mass oscillates back and forth from the end of a spring of spring constant 120 N/m. Depending on that x max =0.7 calculate the total energy

and it velocity vx= -3.4m/s

Step one:

given

mass m= 2.3kg

spring constant k= 120 N/m

x= 0.7m

vx=-3.4m/s

Step two:

The expression for the total energy is

\(Energy= 1/2mv^2 + 1/2Kx^2\)

substituting we have

\(Energy= 1/2*2.3*3.4^2+1/2*120*0.7^2\)

\(Energy= 13.29+29.4\\\\Energy=42.69J\)

The value 159,000 J equals the total mechanical energy of the coaster car at this point. The 3rd option is the correct option.

In the physics mechanical energy (M.E) at a point in space =P.E (potential energy)+k.E(kinetic energy). Mechanical energy of a body is a constant in a scenario, all the changes that are observed is either in P.E or K.E, if one increase with x J the other will decrease with x J ,thus their sum or mechanical energy remain constant.

Given in the problem P.E is 27,000 J and K.E is 132,000 J on adding we found that their sum is 159,000 J, so the sum of these energies represent the Mechanical energy of the rollar coaster.

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One of the best defensive driving techniques for windy conditions is driving with both hands on the steering wheel.

When driving in windy conditions, it is essential to take some safety precautions to avoid accidents and maintain control over the vehicle. A vehicle's stability and safety depend on the driver's ability to control it, especially in extreme weather conditions. Driving with both hands on the steering wheel is the most recommended defensive driving technique to stay in control of the vehicle during windy conditions. Besides driving with both hands on the steering wheel, it's essential to maintain a slow and steady speed, pay attention to the wind direction, and stay focused on the road. The strong wind can cause vehicles to drift, sway, or even flip, so it's necessary to keep a safe distance from other vehicles, especially large trucks or buses. When driving on a windy day, it's crucial to remain calm and avoid panic. Sudden movements and reactions can cause the driver to lose control of the vehicle, which could result in a severe accident. Therefore, it's best to stay alert, keep both hands on the steering wheel, and maintain a slow and steady speed to stay safe in windy conditions.

In conclusion, the best defensive driving technique for windy conditions is driving with both hands on the steering wheel, maintaining a slow and steady speed, and keeping a safe distance from other vehicles. Stay focused, stay calm, and stay safe. The answer to the question is: driving with both hands on the steering wheel.

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A spring of force constant 120 N/m acted up by a constant force of 240N. Then, the elastic potential energy stored in the spring is 240 Nm.

The elastic potential energy stored in the spring is formulated as follows

                                                 PE = ½kx²

Where PE is the elastic potential energy, x is the displacement of the spring from its equilibrium position, and k is the spring force constant.

In this question, the spring force constant is 120 N/m, and the constant force acting on the spring is 240 N. To find the spring displacement, we can use the formula:

F = kx

Where F is the force acting on the spring, x is the displacement, and k is the force constant,

So that:

F = kx

240 N = 120 N/m . x

x = 240 N/120 N/m

x = 2 m

Once x is known, then we can calculate the potential energy of the spring:

PE = ½kx²

PE = ½ (120) (2²)

PE = 60 x 40

PE = 240 Nm

So, the elastic potential energy stored in the spring is 240 Nm.

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The method used by astronomers to infer the existence in space of a dark object of about 5 solar masses, such as a black hole, is the measurement of the effect of its gravitational force on a companion object in a binary system. This method is known as the radial velocity or Doppler shift method.

The gravitational pull of the black hole causes the companion object to move in an orbit, and the measurements of the Doppler shift of its spectral lines can reveal the presence of the black hole.

Other methods such as the measurement of the gravitational redshift of spectral lines in the spectrum of the object and estimation of the luminosity of the object and the application of the mass-luminosity relationship can also be used to infer the existence of a black hole.

Infrared imaging of a region whose effective temperature is lower than the cosmic microwave background, rendering it dark, can also reveal the presence of a black hole by detecting the radiation emitted from the heated material surrounding it.

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3

Explanation:

it will collide then friction will slow it down

The argon molecules become solid when the temperature decrease from 20C to -190 C.

The changes in arrangement and movement of the particles of the argon occurs as the temperature of the air decreased because the argon gas begins to freeze. The freezing point of argon is -189 Celsius so when the temperature decrease from 20C to -190 C, the argon molecules becomes solid.

So we can conclude that the argon molecules become solid when the temperature decrease from 20C to -190 C.

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As the rollercoaster moves from point A to point B, the correct answer is option c: The kinetic energy increases and the potential energy decreases.

At point A, the rollercoaster is at its highest position, which corresponds to the maximum potential energy and minimum kinetic energy. As the rollercoaster moves downwards towards point B, it gains speed and its height decreases.

This results in a decrease in potential energy since the height is decreasing. At the same time, the rollercoaster's speed increases, leading to an increase in kinetic energy.

The conservation of energy principle states that the total mechanical energy (the sum of potential energy and kinetic energy) of a system remains constant in the absence of external forces.

In this case, as the rollercoaster moves from point A to point B, the decrease in potential energy is equal to the increase in kinetic energy, keeping the total mechanical energy constant.

Therefore, the correct answer is option c: The kinetic energy increases and the potential energy decreases.

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Answer:

See Below

Explanation:

1: Thermal  Energy

2: Chemical Energy

3: Nuclear Energy

4: Electrical Energy

5: Radiant Energy

6: Light Energy

7: Motion Energy

8: Sound Energy

There are 8 types are energy that are above.

Hope this helps.

Answer:

down below

Explanation:

for a scale, kg is used, as well as grams

for force, newtons is used

Explanation:

E = mcΔT

E = (200 kg)(4200 J/kg°C)(20 - 70°C)

E = 42000000 J

In ancient times, Astronomy was predicting the motion of the stars, while Astrology was predicting how those stars affected us.

 If a star is moving away, its light waves get stretched out to longer, redder, wavelengths, producing a redshift. The faster the star, the greater this shift, so observers can measure the line-of-sight speed from the Doppler shift.the astronomer William Herschel (1738-1822) systematically measured the proper motion of stars in the sky. He found that stars were moving apart in one region and coming closer together in another, and concluded that the Sun was moving toward the region where stars are moving apart.

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Answer:

t = 0 1.697 seconds

Explanation:

Comment

This is a standard question where the time is the same for both the vertical distance the ball has to drop and the time it takes to go horizontally.

Formulas

dv = vi*t + 1/2 a t^2

dv is the vertical distance that the ball has to travel in a downward direction

dh = vh * t

Givens

a = 9.81

dv = 1.44

vi = 0

t = ?

dh = 2 m

t = same as above (but not given)

Solution

dv = 1/2 a * t^2

1.44 = 1/2 * 9.81 *t^2                 Multiply by 2

2*1.44 = 1/2 * 2 * t^2

2.88 = t^2

t = 1.697 seconds

Note that you do not have to use the horizontal information to get the time. You only have to realize that the ball has no vertical velocity to begin with.

Answer:

Lower body strength is the ability of the body to exert a maximum force against an object external to the body in one maximum effort of the lower body muscles. Gluteals are muscles that make up the buttocks. Their roles are to facilitate hip extension and lift the leg to the side.

Explanation:

Answer:

Increasing the temperature of the rod

Explanation:

Answer:

F = 3.86 x 10⁻⁶ N

Explanation:

First, we will find the distance between the two particles:

\(r = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2+(z_{2}-z_{1})^2}\\\)

where,

r = distance between the particles = ?

(x₁, y₁, z₁) = (2, 5, 1)

(x₂, y₂, z₂) = (3, 2, 3)

Therefore,

\(r = \sqrt{(3-2)^2+(2-5)^2+(3-1)^2}\\r = 3.741\ m\\\)

Now, we will calculate the magnitude of the force between the charges by using Coulomb's Law:

\(F = \frac{kq_{1}q_{2}}{r^2}\\\)

where,

F = magnitude of force = ?

k = Coulomb's Constant = 9 x 10⁹ Nm²/C²

q₁ = magnitude of first charge = 2 x 10⁻⁸ C

q₂ = magnitude of second charge = 3 x 10⁻⁷ C

r = distance between the charges = 3.741 m

Therefore,

\(F = \frac{(9\ x\ 10^9\ Nm^2/C^2)(2\ x\ 10^{-8}\ C)(3\ x\ 10^{-7}\ C)}{(3.741\ m)^2}\\\)

F = 3.86 x 10⁻⁶ N

Answer:

I do belive that it is B hrs cn I an gn

According to the question a plastic rod that has been charged to − 15nc touches a metal sphere. Afterward, the rod's charge is − 1.0nc.The electrons will be transferred from the plastic rod to the metal sphere and the number of electrons ( n ) = 8.73 * 10^10

First of all, write the initial charge on the plastic rod, and then it touches the metallic sphere. Then, a few amounts of charge are transferred to the steel sphere. Later, calculating the price difference between the plastic rod and metal sphere, the kind of charged particle transferred may be decided. Ultimately, the number of electrons may be calculated by the use of the overall charge and the rate of the electron.

The expression of the total charge in electrostatics is Q = ne

Q = charge

n = number of electrons

e = charge of the electron

The initial charge on the plastic rod ( Qplastic ) = -15nC

Final charge on the metal sphere after it was touched by the plastic rod ( Qmetal ) = -1nC

The charge transferred from the metal rod to the sphere = ( Q = Qplastic -   Qmetal )

Therefore Q = - 15nC - ( -1nC )

Q = -14nC

The plastic rod is negatively charged, so the electrons will be transferred to the metal sphere. The electrons will be transferred from the plastic rod to the metal sphere.

The expression of the total charge in electrostatics is Q = ne

The expression for n = Q / e

Q = -14nC

The charge on 1 electron = 1.602 * 10^-19 C.

Number of electrons ( n ) = -14nC ( 10^-9C/1nC ) / -1.602 * 10^-19 C.

Number of electrons ( n ) = 8.73 * 10^10

Threfore the number of electrons ( n ) = 8.73 * 10^10

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Answer:

atomic weight 20.180

protons 10

neutrons 2,8

Explanation:

Answer: increase

Explanation:

increase of  compression make it hot