ANSWER ASAP FOR 40 POINTS


The Doppler effect is the result of a ____ sound source that causes the sound to appear higher or lower than its true ____. As a sound source approaches an observer, the distance between each ____ in the wave is ____. This causes a ____ perceived pitch. As a source moves away from an observer, the distance between each crest in the wave is ____. This causes a ____ perceived pitch. The size of the pitch ____ is determined by the speed of the source relative to the speed of ____.

Word Bank

higher
shift
increased
moving
lower
pitch
sound
crest
shortened

Answer:

A satellite orbiting the Earth

Explanation:

Kinetic energy is the intrinsic energy possessed by an object in motion.  The bigger the object in motion, and the higher its speed , the higher the kinetic energy. The equation below is used to calculate this energy also referred to as the work put into the object to accelerate it into its current velocity.

E(k) = 1/2 * m * v²

The best example of kinetic energy in the options provided is 'A satellite orbiting the Earth'. Kinetic energy specifically refers to the energy possessed by an object in motion, such as a satellite that is constantly moving in its orbit around the Earth.

The best example of kinetic energy among the given options is: 'A satellite orbiting the Earth'. Kinetic energy is the energy of motion. Therefore, any object in motion possesses kinetic energy. The satellite orbiting the Earth is in constant motion; thus, it has kinetic energy. The other examples like a book sitting on a bookshelf, a golfer preparing to putt the ball, and a race car in position at the start line are instances of potential energy or energy that is stored and has the capability to do work but isn't actively doing so.

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Uranium-238 undergoes alpha decay. Therefore, uranium-238 will  

A. Remain stable  

B. Stay the same element  

C. Release charged particles and no energy  

D. None of the above

The actual answer is that it will change into a different element altogether.

Answer:

D.None of the above.

Explanation:

We are given that uranium-238 undergoes alpha decay.

Therefore, uranium-238 change into into new element of atomic number 2 less and mass number 4 less and releasing an alpha particle  because it undergoes alpha decay

U-238[tex]\rightarrow [/tex]an atome with atomic number 2 less and mass number 4 less+ helium particle with atomic number 2 and mass number 4

Alpha decay: When an element undergoes an alpha decay then it transform into an atom with atomic number 2 less and mass number 4 less due to emission of alpha particle (alpha particle means helium particle which have atomic number 2 and mass number 4)

Therefore, option A is false.

B. It is also false.Because  a new atom is formed and there is no releasing  of charged particle

C.There is no any releasing of charged particle and no energy.Hence, it is false.

Answer :D. None ob the above.

The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:

"The electrostatic force [tex]F_{E}[/tex] between two point charges [tex]q_{1}[/tex] and [tex]q_{2}[/tex] is proportional to the product of the charges and inversely proportional to the square of the distance [tex]d[/tex] that separates them, and has the direction of the line that joins them"

Mathematically this law is written as:

[tex]F_{E}= K\frac{q_{1}.q_{2}}{d^{2}}[/tex]    (1)

Where [tex]K[/tex] is a proportionality constant.

Now, if we say [tex]q_{1}[/tex] is the proton and [tex]q_{2}[/tex] is the electron, and cut the distance between them in half, the new distance will be [tex]\frac{d}{2}[/tex].

Substituting this new distance in equation (1):

[tex]F_{E}= K\frac{q_{1}.q_{2}}{(\frac{d}{2})^{2}}[/tex]   (2)

[tex]F_{E}= 4K\frac{q_{1}.q_{2}}{d^{2}}[/tex]     (3)>>>As we can see, the force becomes four times stronger

Answer:

The Answer Is C

Explanation:

It is an imaginary transformer which has no core loss, no ohmic resistance and no leakage flux. The ideal transformer has the following important characteristic. The resistance of their primary and secondary winding becomes zero. The core of the ideal transformer has infinite permeability.

An ideal transformer is a theoretical device with 100% efficiency, no energy losses, and follows the principle of power conservation. The voltage ratio across the coils is equal to the ratio of their turns. This idealized model helps in understanding transformer behavior without considering real-world inefficiencies.

An ideal transformer is a theoretical device used to model the behavior of real transformers without considering energy losses. Here are the main characteristics of an ideal transformer:

An ideal transformer is thus an efficient, lossless device that perfectly transfers energy between two circuits through magnetic induction.

Answer:

54 mWb

Explanation:

The magnetic flux linkage through the coil is given by:

[tex]\Phi = BA sin \theta[/tex]

where

B is the magnetic field strength

A is the cross sectional area

[tex]\theta[/tex] is the angle between the direction of the field and the normal to the coil

In this problem:

B = 0.92 T

A = 0.074 m^2

[tex]\theta=52^{\circ}[/tex]

Therefore, the magnetic flux linkage is

[tex]\Phi = (0.92 T)(0.074 m^2) sin 52^{\circ}=0.054 Wb=54 mWb[/tex]

Answer:

[tex]1.5\cdot 10^5 J[/tex]

Explanation:

The power used by an object is defined as:

[tex]P=\frac{W}{t}[/tex]

where

W is the amount of work done by the object

t is the time taken

In this problem, we have:

P = 500 W is the power of the microwave

[tex]t=5 min=300 s[/tex] is the time taken

So we can solve the formula for W, the work done by the microwave:

[tex]W=Pt=(500 W)(300 s)=1.5\cdot 10^5 J[/tex]

Answer:

Current in the circuit, I = 0.2 amps

Explanation:

It is given that,

Voltage of the circuit, V = 1.5 volts

Resistance, R = 7.5 ohms

According to Ohm's law, the voltage is equal to the product of current and the resistance.

i.e. [tex]I=\dfrac{V}{R}[/tex]

V is the voltage across the circuit

R is the resistance in the circuit

[tex]I=\dfrac{1.5\ V}{7.5\ \Omega}[/tex]

I = 0.2 amps

Hence, the correct option is (d).

We measure temperature of matters with a device called thermometer. There are three types of thermometer, Celsius Thermometer, Fahrenheit Thermometer and Kelvin Thermometer.

Non-examples of temperature include instances like inaccurately implying ratios in temperature, thinking an increase in internal energy always results in an increase in temperature, and misconceptions about absolute zero in temperature scales.

A non-example of temperature could be simply understood as a situation or instance where temperature doesn't play a significant role, or where the notion of temperature as we usually perceive it, does not apply. For instance, the concept of ratio or multiplication in temperature such as saying 80 °C is four times as hot as 20 °C is a non-example, because there's no meaning to the ratio of 80 to 20 (or four to one) in the context of temperature. Another non-example is the assumption that increasing internal energy of a system necessarily increases its temperature; this is not always true. The temperature does not change when a substance changes from one phase to another, like during the melting of ice. This can be accomplished by adding heat or doing frictional work without changing temperature.

The concept of absolute zero, where there is zero molecular motion, is another perception which sometimes confounds the casual understanding of temperature, especially in cases like Celsius (C) and Fahrenheit (F) temperature scales where 0 degrees does not mean absence of heat because temperatures lower than zero exist and are in fact colder. Thus, these cases represent non-examples of common understanding of temperature.

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The answers are:

A. Tension

B. Air resistance

C. Friction

E. Applied force

Let's discard each given option in order to find what forces requires physical contact:

A. Tension, correct: Tension force appears when it's a force pulling another object, trying to move it in the same direction, the tension usually involves a rope or cable used to pull another object. For example, a mass being held with a rope/cable.

B. Air resistance, correct: Air resistance, or drag, is a force acting in the opposite direction of a body in motion when it's passing through the air, involving contact between the air molecules and the surface of the object. For example, when an airplane is flying, it's being affected by the air resistance, making it move slower.

C. Friction, correct: The friction appears when there is an object surface being in contact with another object surface, both or just one can be in motion, the frictional forces always go in the opposite direction of the motion. For example, when you try to pull a box from a place to another, there is always a force that opposes to the movement, making you to apply more force in order to move the object,  it's the frictional force.

D. Magnetic force, incorrect: Magnetic force does not require physical contact between objects. The magnetic force acts on an object, pulling or attracting it. For example, using a magnet to attract a metallic object does not involve any physical contact, the force acts on the metallic object attracting it with no contact.

E. Applied force, correct: The applied forces involve physical contacts, applying forces on an object can result in the object motion. For example, pushing a button, the button us bein affected by an applied force and it will move in the same direction that the force.

Have a nice day!

Answer:

A. Tension

B. Air resistance

C. Friction

E. Applied force

Explanation:

I think it is reactants

Products must equal reactants in a chemical reaction. This is known as the law of conservation of mass.

In a chemical reaction, one or more reactants (also known as reactants) are changed into one or more products (also known as products).

If there are the same number of atoms of various elements on either side of the equation, then the total atomic mass on the products side will be equal to the reactants side.

This should happen according to the law of conservation of mass in chemical reactions.

This means that during a chemical reaction, no atoms are created or destroyed. They are merely rearranged to form new molecules. This is why chemical equations must be balanced, or have the same number of atoms of each element on both sides of the equation.

By balancing the equation, we ensure that the law of conservation of mass is obeyed and that the products equal the reactants in terms of the number and type of atoms and molecules involved.

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Answer:

As the temperature increases, the kinetic energy of the molecules of the liquid increases.

Explanation:

As the temperature increases, the kinetic energy of the molecules of the liquid increases.

The statement is False

Final answer:

The statement is false; the minimum number of nodes on a standing wave on a string is 2 (at the fixed ends), and the minimum number of antinodes is 1, seen in the fundamental frequency or first harmonic.

Explanation:

The statement that 'on a standing wave on a string, the minimum number of nodes is 1 and antinodes is 2' is false. On a standing wave on a string that is fixed at both ends, the minimal standing wave pattern would include two nodes and one antinode. This is seen in the fundamental frequency (first harmonic), where the wave has a single antinode in the center of the string and a node at each fixed end. Nodes are points of no motion in standing waves, while an antinode is the location of maximum amplitude of a standing wave.

the correct answer A                                                  

Hello, the answer is d. A

Best regards

1. When the distance is doubled: [tex]3\cdot 10^{-7}N[/tex]

The electrostatic force between two charges is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 and q2 are the two charges

r is the distance between the two charges

The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is doubled, so we can write

[tex]r'=2r[/tex]

And substituting into the formula, we find the new force:

[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(2r)^2}=\frac{1}{4}k\frac{q_1 q_2}{r^2}=\frac{F}{4}[/tex]

So, the force is reduced to 1/4 of its original value. Therefore, it is

[tex]F'=\frac{1.2\cdot 10^{-6} N}{4}=3\cdot 10^{-7}N[/tex]

2. When the distance is halved: [tex]4.8\cdot 10^{-6}N[/tex]

The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is halved, so we can write

[tex]r'=r/2[/tex]

And substituting into the formula, we find the new force:

[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(r/2)^2}=4k\frac{q_1 q_2}{r^2}=4F[/tex]

So, the force is quadrupled. Therefore, it is

[tex]F'=4(1.2\cdot 10^{-6} N)=4.8\cdot 10^{-6}N[/tex]

3. When the distance is tripled: [tex]1.33\cdot 10^{-7}N[/tex]

The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is tripled, so we can write

[tex]r'=3r[/tex]

And substituting into the formula, we find the new force:

[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(3r)^2}=\frac{1}{9}k\frac{q_1 q_2}{r^2}=\frac{F}{9}[/tex]

So, the force is reduced to 1/9 of its original value. Therefore, it is

[tex]F'=\frac{1.2\cdot 10^{-6} N}{9}=1.33\cdot 10^{-7}N[/tex]

1) Charge: [tex]7.5\cdot 10^{-8} C[/tex]

Explanation:

The electrostatic force between the two shirts is:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 = q2 = q is the charge of each shirt (they are equally charged)

r = 4 cm = 0.04 m is the distance between the shirts

F = 0.5 N is the force

Re-arranging the equation, we can find q, the charge of each shirt:

[tex]q=\sqrt{\frac{Fr^2}{k}}=\sqrt{\frac{(0.5 N)(0.01 m)^2}{9\cdot 10^9}}=7.5\cdot 10^{-8} C[/tex]

2) Force if they are separated by 4 cm: 0.03 N

In this case, the force between the two shirts would be:

[tex]F=k\frac{q_1 q_2}{r^2}=(9\cdot 10^9)\frac{(7.5\cdot 10^{-8}C)^2}{(0.04 m)^2}=0.03 N[/tex]

Answer:

C. 7.4E-6C, 0.03 N

Explanation:

D.Power has a time component while energy does not. This is because power is the RATE at which work is performed.

Answer: The correct answer is "magnetic field".

Explanation:

A magnetic field is produced around the current carrying wire.

If you bring compass needle around the current carrying wire then it shows the deflection which indicates that there is a magnetic  field around the current carrying wire.

Magnetic fields are the area around the surrounding of magnet in which magnetic force can be experienced.

Therefore, a magnetic field is produced around a wire when an electrical current is in the wire.

magnetic field took the test

Here i state the conservation of energy rule and use that to justify my answer. I showed how to manipulate percentages to get the final answer of 11000J (2sf). Hope I'm right xx

11,111.11 J of chemical energy must be supplied to the car engine to produce 5000 J of kinetic energy, given that the engine is 45% efficient.

To find the amount of chemical energy that must be supplied to the car engine to produce 5000 J of kinetic energy, we need to consider the efficiency of the engine.

Efficiency is defined as the ratio of useful output energy to the input energy. In this case, the engine is 45% efficient, which means only 45% of the supplied chemical energy is converted into useful kinetic energy.

Let Echemical be the chemical energy supplied to the engine, and Ekinetic be the kinetic energy produced.

Efficiency (η) = (Useful output energy / Input energy) * 100%

η = (Ekinetic / Echemical) * 100%

Given:

Ekinetic = 5000 J

Efficiency (η) = 45% = 0.45 (in decimal form)

Now, we can rearrange the equation to solve for Echemical:

Echemical = Ekinetic / η

Echemical = 5000 J / 0.45

Echemical ≈ 11111.11 J

Hence, approximately 11,111.11 J of chemical energy must be supplied to the car engine to produce 5000 J of kinetic energy, given that the engine is 45% efficient.

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d

please give me brainlest

I think that the answer is D, not sure though

tell me if I'm wrong please.

Answer:

The answer is B

That operates against motion when two objects are touching

Explanation:

Friction is a force that operates against motion when two objects or surfaces are touching. Friction is applied in the direction that is opposite the direction of motion.

Friction is a force that operates against motion when two objects are touching. So, option b is correct.

Friction is defined as the opposing force exerted by the surface when an object moves on it.

Here,

Friction is a resistive force that opposes relative motion between two surfaces. It is exerted by the surface on an object that is moving on it, which is in contact with the surface. So, frictional force is a contact force. It prevents sliding or rolling of an object on a surface in contact. It acts against the motion or the applied force. The object can move only if the applied force on the object overcomes the frictional force exerted by the surface. Frictional force is of various types.

Friction can also act on stationary object.

Friction causes wear and tear to the parts of machines.

Friction is known as resistive force because it always acts against the motion when there is a relative motion between surfaces.

Hence,

Friction is a force that operates against motion when two objects are touching. So, option b is correct.

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Answer:

2. at the highest point

Explanation:

For a generic object, the PE (gravitational potential energy) is defined as

PE = mgh

where

m is the mass of the object

g is the gravitational acceleration

h is the height of the object with respect to the ground

From the formula, we see that PE is maximum when h is maximum: so the PE is maximum when the object is at the highest point.

The most destructive kind of mass movement a landslide.

Landslide is the most destructive kind of mass movement.

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How is production to be organized? is the correct answer on APEX.

Answer:how is production to be organised

Explanation:

false 99.8% sure i looked it up so i believe thats it

The statement is false. For a fixed mass, gold, which is denser than aluminium, will have a smaller volume.

The statement that 1kg of gold will have seven times the volume of 1kg of aluminium is false. The volume of a material is derived from its mass and its density. Specifically, volume equals mass divided by density. The density of gold is about 19.3 g/cm³ while the density of aluminium is about 2.7 g/cm³. Hence, for a given mass, gold will have a smaller volume than aluminium. The intuitive reason for this is that gold is denser than aluminium - it has more mass packed into the same volume.

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True. Strength training combined with cardiovascular fitness does make the body stronger and healthier.

Hope this helps. Please mark as brainliest.

The answer is true :)

Sorry took a while to answer

18.9 but round it and you get 19

In this case if given those choices your answer would be (C. 19).

However in more complicated Chemistry rules you would learn that the periodic table only showcases 1 of the many possible masses of the element.

Hope this help! :D  

-40 is the correct answer

At the player's maximum height, their velocity is 0. Recall that

[tex]{v_f}^2-{v_i}^2=2a\Delta y[/tex]

which tells us the player's initial velocity [tex]v_i[/tex] is

[tex]0^2-{v_i}^2=-2g(0.65\,\mathrm m)\implies v_i=3.6\dfrac{\rm m}{\rm s}[/tex]

The player's height at time [tex]t[/tex] is given by

[tex]y=v_it-\dfrac g2t^2[/tex]

so we find their airtime to be

[tex]0.65\,\mathrm m=\left(3.6\dfrac{\rm m}{\rm s}\right)t-\dfrac g2t^2\implies t=0.36\,\mathrm s[/tex]