What best describes the angle between a changing electric field and the electromagnetic wave produced by it? (2 points)

A) always equal to a right angle

B) always less than a right angle

C) varies from parallel to perpendicular

D) varies from perpendicular to parallel

Answer: Chemical energy to kinetic energy, heat energy, sound energy and light energy.

Explanation: The crackers are made up of gunpowder which is a chemical substance. When this gunpowder powder burns it produces smoke and hot gases (generation of heat and light energy) which create high pressure inside the can and blows the can open, and make all the tiny particles of powder blow out and chemical energy is converted to kinetic energy.

It makes the air to push outward and when it collapses back, it leads to generation of sound. So the chemical energy stored in gunpowder gets converted to sound.

The height and speed of a rocket that starts from rest and undergoes variable acceleration can be found by integrating the acceleration function to obtain velocity and position as functions of time, and then solving for the specific conditions given in the problem (at t = 10.0 s and when the rocket is 325 m above the Earth's surface).

The question involves an upward movement with an acceleration given by a(t) = A - Bt²/2. We are to find the height of the rocket above the surface of the Earth at t = 10.0 s and the speed of the rocket when it is 325 m above the surface of the Earth.

To find the height, we integrate the acceleration equation with respect to time to get the velocity equation and then integrate again to get the position equation. Given the initial conditions that the rocket starts from rest, we can find the height by integrating the acceleration function.

To find the speed at a certain height, we need to use conservation of energy or integrate the acceleration function to get velocity as a function of time and then solve for the time at which the rocket reaches 325 m. Once the time is known, it can be substituted back into the velocity function to find the speed of the rocket at that height.

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As the kinetic energy of the object becomes 4 times when speed of it changes from v to 2v, s it takes four times the amount of work to increase its speed from rest to a speed of 2v.

According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.

As a scalar quantity, kinetic energy can only be fully defined by its magnitude.

Let the mass of the object is = m.

When its speed is v, kinetic energy of it: E₁ = 1/2 × mv²

When its speed is 2v, kinetic energy of it: E₂ = 1/2 × m(2v)²

= 4 × 1/2 × mv²

= 4 E₁

As the kinetic energy of the object becomes 4 times when speed of it changes from v to 2v, s it takes four times the amount of work to increase its speed from rest to a speed of 2v.

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Answer:  

During constructive interference occurs at any location along the medium  where two inferring waves are in the same direction. In this case both waves have upward displacement. Consequently the medium has an upward displacement has that is greater than the displacement of inferring pulses.

Answer: C

Gauge pressure = 156 kPa ,

What is absolute pressure =?

     We know that,

      absolute pressure = gauge pressure + atmospheric pressure

                           Pabs = Pgauge + Patm

                                     = 156 + 101.3             (since atm.pr. = 101.3 Kpa)

                                     = 257.3 KPa absoulte

                                     approximately  = 256 KPa absolue

Magnets can have zero resistance due to the properties of superconductors. These materials exhibit zero electrical resistance and perfect diamagnetism at very low temperatures, a phenomenon known as the Meissner effect. Consequently, the magnetic field within a superconductor is zero, and once a current is established, it will persist without any applied voltage source.

Magnets are capable of having zero resistance due to the properties of superconductors. Superconductors exhibit zero electrical resistance and perfect diamagnetism when cooled down to very low critical temperatures. This expulsion of all magnetic fields results in a net magnetic field of zero within the superconductor, even in the presence of an applied magnetic field, known as the Meissner effect.

An interesting consequence of this zero resistance is that once a current is established in a superconductor, it will persist without any applied voltage source. Furthermore, with a magnetic object, each surface you can imagine that encloses all or part of the magnet ultimately has zero net flux of magnetic field lines flowing through the surface. Just as many outward-flowing lines from the magnet's north pole pass through the surface as inward-flowing lines from the south pole of the magnet.

In superconductors, resistance disappearing is not the only intriguing phenomenon. The exclusion of magnetic fields, which is another manifestation of the Meissner effect, occurs as well. The forces on these currents tend to cancel, making the magnetic drag almost zero.

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Superconductivity, a state achieved at very low temperatures, allows magnets to have zero resistance and to expel all magnetic fields - a phenomenon known as the Meissner effect. In this state, a current persists without a needed voltage source. This property has practical applications such as in the technology used to levitate high-speed trains.

In order for magnets to have zero resistance, they have to achieve a state known as superconductivity. Superconductivity is a phenomenon that occurs in some materials when they are cooled to very low critical temperatures. In this state, there is a resistance of exactly zero and all magnetic fields are expelled. This lack of resistance means that, once a current is established in a superconductor, it persists without an applied voltage source.

This is closely linked to something known as the Meissner effect, whereby superconductors expel all magnetic field lines. This perfect diamagnetism means that the net magnetic field within a superconductor is always zero — any magnetic field lines that pass through a superconducting sample when it is in its normal state are expelled once the sample becomes superconducting.

The practical applications of these properties are considerable. For instance, high-speed trains have been developed that levitate on strong superconducting magnets, exploiting the fact that a light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor.

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Answer;

density = (mass/volume)

here density varies with respect to change in volume by assuming constant volume.

changing the temperature, change in density. most matter increases in volume when it gets hotter. Example, when an iron rod is heated, it will get longer and its density will decrease. This happens because the mass of the rod constant, but volume increase.

Given that:

spring compressed ( x) = 0.2 m

                        Work (W) = 24 J

 determine , spring constant (x)=?

               We know hat ,

                      Work   (W) = (1/2). k.x²

                                   24 = 1/2 ( k × 0.2²)

                                     48 = k × 0.2²

                                      k = 1200 N/m

It takes Earth about 24 hours to rotate once on its axis. The movement of one object around another object is called revolution. ... Earth's path as it revolves around the sun is called its orbit. Earth's orbit is a slightly elongated circle, or ellipse.

the answer is B. hope this helps

formed by the process of glaciation.

Answer:

Generator.

Generator is the essential element used to convert Mechanical energy to Electrical energy.

For example, a shaft rotates in the generator, produces EMF.

Thermal energy comes from moving particles

By making particles go faster, you increase the kinetic energy creating heat.

Answer:

The fore-brain consists of the cerebrum, thalamus, and hypothalamus. Mid-brain relays information between fore-brain and hind-brain. Mid-brain plays important role in developing motor functions like eye movement, auditory functions and visual processing.  The crus cerebri connects the cerebral hemispheres to the cerebellum, contains a portion having a network of neurons that is responsible for arousal and alertness.

Differences:

An electrical motor converts electrical energy into mechanical energy,where as a generator converts mechanical energy into electrical energy.

The principle of a electric motor if there is a change of the magnetic field across a conductor  electrons are forced to move in a direction perpendicular to the direction of the magnetic field,where as in a generator if a charge is moving in a magnetic field, a force acts on the charge in a direction perpendicular to both the velocity of the charge and the magnetic field.

similarities:

Both electric motor and generator work on the magnetic effects of electric current.

Both have the armatures to rotate the loop.

An electromotor and generator have similar structures involving wire loops and magnetic fields. However, an electromotor converts electrical energy to mechanical, while a generator performs the opposite conversion - mechanical to electrical.

Both an electromotor and a generator have similar structures and both involve interactions between magnetic fields and current-carrying wires to function. However, they perform opposite energy conversions.

An electromotor, or electric motor, converts electrical energy into mechanical energy. This operates by passing an electrical current through wire loops within a magnetic field. The magnetic field exerts a force on the current-carrying wires, resulting in a rotational motion.

On the other hand, a generator converts mechanical energy into electrical energy. It functions by rotating wire loops within a magnetic field, which causes an alternating current to form. Sources of the mechanical energy that rotates the loops can include hydropower, wind energy, or the release of steam in a turbine system.

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Answer:

Work done by the machine (W) =  500 × 1.5 = 750 J

Work supplied to the machine (W) = 100 × 10 = 1000 J

              Here, work supplied to the machine is input work = 1000 J

I would like to believe that people are most likely to be obedient to rules that benefit the common good of others (C).

Sadly, I don't.

Perhaps I've become cynical because of my age.  But, without seeing any psychological analysis or survey data on the subject, my opinion is that people are more likely to be obedient to rules that benefit only themselves (D).

People are most likely to be obedient to rules that benefit only themselves. This is because in the end, everyone is selfish by nature.

Answer: D. benefit only themselves

shoutout to: the AL2006 above, who answered first

none; live

An object with equal amounts of positive and negative charge is called neutral object.

"Electric Charge is a property of subatomic particles that causes them to experience a force when they are placed in an electric and magnetic field." Positive and negative electric charges are commonly carried by charge carriers protons and electrons.

A scalar quantity is an electric charge. A vector quantity, in addition to having a magnitude and a direction, must also obey the laws of vector addition, such as the triangle law of vector addition and the parallelogram law of vector addition; only then is the quantity said to be a vector quantity.

Subatomic particles or matter particles are examples of charge types:

Any object with equal amounts of positive and negative charge is called neutral object.

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Number 1 is correct.

The amount of power has decreased. This is most likely the result of

A. less work being done over a longer period of time.

Power is defined as work divided by time, or P = W / t. Therefore, as work increases and time decreases power increases.

Performance is the speed at which work is completed. The rate in this case means per unit time. Performance is calculated by dividing the work done by the time it takes to complete the work.

As already mentioned, performance is the speed of work. Therefore, it can be calculated by dividing the work done by the time. The formula for power is: Where P is the power, W is the work done, and t is the time required.

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Given data

mass (m) =8 Kg ,

speed (v) =10 m/s ,

time (t) = 5 s

determine magnitude of force (Fnet) = ?

                    we knoe that

                                        Fnet = m.a

                                                 = 8 × (v/t)       since a = v/t

                                                 = 8 × (10/5)

                                                 = 16 N

Magnitude of net force is 16 N

i think it's Precambrian

D in regions near the equator

Based on the ideal gas equation, the pressure (P), volume (V) and temperature (T) corresponding to n moles of an ideal gas are related as:

PV = nRT

where R = gas constant

Under conditions of constant pressure and  number of moles:

The volume is directly proportional to the pressure. Therefore, as the temperature drops the volume will also decrease.

V α T

This is also known as the Charles Law.

Average Velocity= displacement/time   Av=50/0.50   Av=100

Answer: Land cools faster than water

Reason: Water has high specific heat capacity, so it absorbs huge amount of heat energy to increase comparatively small amount of temperature. Loosing a large amount of heat requires more time, so water takes more time to cool down.

In order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.

Distance is a measurement of the separation between two things or places. When we talk about distance, we're talking about a physical length or an estimate based on other physics or practical usage factors.

It is given that:

In order to determine the velocity, you must know:

The options are:

As we know,

A vector quantity is a velocity. It is characterized as a movement per instant.

Distance in a specific direction is known as dispersion, when an entity travels in a certain direction, such straight line, velocity can also be related to speed.

Thus, in order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.

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Answer: d, All of the above.

    It states that "Every object will remain at rest or uniform motion unless compelled to change its state by the action of an external force".  

 All the choices a, b, c and d are explaining the newtons I law and proving above statement.

The answer is B because if you seen a movie you would see it happen

The change in the car engine's sound as it approaches the camera can be explained by the Doppler Effect. The sound will get louder, and the pitch will get higher.

This question pertains to the Doppler effect observed in sound waves. When a race car starts its engines, the sound of the car's engine roaring is heard at a certain pitch. As the car begins to move towards you, the source of the sound gets closer and the waves reach your ear more frequently. This translates into our perception as a higher pitch. So, the correct answer is B. The sound of the engine will get louder and pitch higher as the car approaches the camera.

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To determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, examine the reactants and products. Single displacement reactions involve the replacement of an element in a compound, while double displacement reactions involve the exchange of ions between two compounds.

In order to determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, you need to examine the reactants and products in the reaction equation.

For a single displacement reaction, one element is replaced by another element in a compound. This can occur when a more reactive element displaces a less reactive element. An example of a single displacement reaction is the reaction between zinc metal and hydrochloric acid:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

On the other hand, a double displacement reaction involves the exchange of ions between two compounds. This can result in the formation of a precipitate or a gas. An example of a double displacement reaction is the reaction between sodium sulfate and barium chloride:

Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)

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