GIVING 45 POINTS FOR A GOOD ANSWER!!!!!!!!!!!!

The mass of the boy is 35 kilograms. What is the force of friction that slowed him down?

Answer:

the answer is F

Explanation: I put T on the question and got it wrong so it's F on edge ;)

Answer:

doppler

Explanation:

The answers include the following:

This is referred to as a barrier which restricts the flow of surface water and has different importance which include the generation of electricity through the wind turbines.

The dam uses the water current to move the turbines and there are some advantages which should be considered before it is constructed such as the control of flood and as a source of water supply.

Disadvantages such as local ecosystem disruption should also be considered so as to protect species and ensure that they don't go extinct.

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The bird travels a total distance of 92 km. When the two trains are 46 km apart, the bird starts flying from one train toward the other train.

Let's assume that the distance between the bird and the first train is x km. Since the bird is flying towards the other train at a speed of 46 km/h and the trains are moving towards each other at a combined speed of 46 km/h, the relative speed of the bird with respect to the first train is

69 km/h (46 km/h + 23 km/h).

Therefore, it takes the bird x/(69 km/h) hours to reach the second train.

During this time, the two trains move towards each other and reduce the distance between them by

Therefore, the distance between the bird and the second train is also x km. Now, the bird starts flying towards the first train at the same speed of 46 km/h. Again, it takes the bird

hours to reach the first train.

During this time, the two trains move towards each other and reduce the distance between them by another x/3 km. Therefore, the total distance traveled by the bird in one round trip is 2x km.

Since x + x/3 + x/3 = 92 km (the initial distance between the trains)

the total distance traveled by the bird in all the round trips is

2(92 km) = 184 km.

However, since the bird only flies halfway towards each train before turning back, the actual distance traveled by the bird is half of 184 km, which is 92 km.

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A flywheel of mass 3. 0g consist of a flat uniform disc of radius 0. 40m. It pivots about central axis perpendicular to its plane, moment of inertia: 2.4 x 10⁻⁴ kg m².

A) To calculate the moment of inertia of a flat uniform disc, we use the formula: I = (1/2) * M * R², where I is the moment of inertia, M is the mass, and R is the radius.

Given the flywheel's mass (3.0g) and radius (0.40m), first convert the mass to kilograms: 3.0g = 0.003 kg. Then, plug the values into the formula: I = (1/2) * 0.003 kg * (0.40m)².

The moment of inertia of the flywheel is approximately 2.4 x 10⁻⁴ kg m².

B) When a torque of 6.8 Nm acts on the flywheel, it causes angular acceleration, which can be calculated using the formula: τ = I * α, where τ is the torque, I is the moment of inertia, and α is the angular acceleration.

Rearrange the formula to find α: α = τ / I. Plugging in the values, we get: α = 6.8 Nm / (2.4 x 10⁻⁴ kg m²). The angular acceleration of the flywheel is approximately 2.83 x 10⁻⁴ rad/s². This means the flywheel will experience a significant increase in angular velocity due to the applied torque.

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Answer:

Hi... Potential energy is converted to kinetic energy and kinetic energy is converted to potential energy

Answer:

A. pole reversals

Explanation:

It's an evidence of magnetic pole reversal of Earth & sea-floor spreading.

Hope this helps!

Magnetic striping is evidence of seafloor spreading and pole reversals. Hence, option A is correct.

The notion that oceanic crust develops along submarine mountain zones, commonly known as the mid-ocean relevant standard, and expands out laterally away from them. This concept was crucial in the creation of the doctrine of plate tectonics, which transformed geologic thought in the last quarter of the twentieth century.

Shortly after World War II, sonar-equipped warships crisscrossed the oceans, gathering ocean-depth profiles of the seafloor underneath them. The survey data was used to create bas-relief maps of the ocean floor, and by 1953, American oceanic mapmaker Marie Tharp had created the first of many maps that revealed the presence of an underground mountain range of more than 16,000 km (10,000 miles) long in the Coast  Mid-Atlantic Ridge.

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The correct answer is option d. Using common sense, we would reject psychological egoism.

Psychological egoism holds that all human acts are guided by self-interest. However, common sense and everyday observations show that people are altruistic and care about others.

Common sense implies people don't always act in their own self-interest. People often help others without expecting anything in return. Helping others, volunteering, and building genuine relationships show it.

Thus, psychological egoism contradicts our ordinary experiences and observations, so common sense suggests rejecting it. Empathy, compassion, and morality drive most of our decisions.

Rejecting psychological egoism does not mean rejecting moral psychology's views on virtues (option c). Moral psychology studies virtues and how they affect people and society. Moral psychology's insights into virtues and ethics are unaffected by psychological egoism.

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Answer:

you didn't post any triangles. Thus, the question could not be answered.

Answer:

The given triangle is a right triangle.

The length of the hypotenuse is 2.52.5 units.

The given angle is 39\degree39° .

The unknown side xx is adjacent to the given angle.

We can therefore use the cosine function to find xx .

Recall the mnemonics CAH.

This means that;

\cos\theta=\frac{Adjacent}{Hypotenuse}cosθ=

Hypotenuse

Adjacent

This implies that,

\cos39\degree=\frac{x}{2.5}cos39°=

2.5

x

We multiply both sides by 2.52.5 to get,

2.5\cos39\degree=x2.5cos39°=x

x=2.5(0.7771)x=2.5(0.7771)

We evaluate to get

x=1.94x=1.94

Therefore the length xx of the side of the triangle is 1.91.9 units to the nearest tenth.

Complete question is;

A 50.-ohm resistor, an unknown resistor R, a 120-volt source, and an ammeter are connected in a complete circuit. The ammeter reads 0.50 ampere.

A) Calculate the equivalent resistance of the circuit shown.

B) Determine the resistance of resistor R shown in the diagram.

Answer:

A) R_eq = 240 Ω

B) R = 190 Ω

Explanation:

A) To get the equivalent resistance, we will use the formula;

R = V/I

Where;

V is Voltage

I is current

R is equivalent resistance

From the question, V = 120 V and I = 0.5A

Thus;

R_eq = 120/0.5

R_eq = 240 Ω

B) From the image, we see that the resistors are connected in series.

Formula for resistors in series is;

R = R1 + R2 +..... Rn

Thus;

240 = 50 + R

R = 240 - 50

R = 190 Ω

A) The equivalent resistance of the circuit shown will be  240 Ω.

B) The resistance of resistor R will be 190 Ω

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

The given data in the problem is;

R is the resistance = 50.-ohm

v is the voltage = 120-volt source

I is the value of the current =0.50 ampere.

A) The equivalent resistance of the circuit shown will be  240 Ω.

According to ohm's law

\(\rm R= \frac{V}{I} \\\\ \rm R= \frac{120}{0.5} \\\\ \rm R=240 \ ohm\)

Hence the equivalent resistance of the circuit shown will be 240 Ω.

B) The resistance of resistor R will be 190 Ω

The given resistors are connected in the series;

R = R1 + R2 +..... Rn

240 = 50 + R

R = 240 - 50

R = 190 Ω

Hence the resistance of resistor R will be 190 Ω

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If two vectors are perpendicular, their cross product is a vector that is perpendicular to both of them, according to the right-hand rule.

The cross product of two vectors in three-dimensional space is a vector that is perpendicular to both of them. If the cross product is perpendicular to both vectors, then it is also perpendicular to any plane that contains them.

If two vectors are perpendicular, then the magnitude of their cross product is equal to the product of their magnitudes. The direction of the cross product can be determined by using the right-hand rule.

If you curl your fingers in the direction of the first vector and then point your thumb in the direction of the second vector, then the direction of the cross product is perpendicular to the plane that is formed by your curled fingers and your pointed thumb.

In conclusion, if two vectors are perpendicular, their cross product is a vector that is perpendicular to both of them, and the magnitude of the cross product is equal to the product of their magnitudes.

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Given that Mitch takes exactly one minute to walk around a circular track.

Hence, Mitch takes 60 seconds to cover the entire circular track.

Therefore, in 45 seconds, the fraction of the circular track covered by Mitch can be determined as shown below:

Fraction covered by Mitch = 45/60 = 3/4 of the track

The central angle corresponding to this fraction of the circular track is given by:

Central angle = (3/4) * 2π = (3/2)π radians

Hence, the of the central angle that corresponds to the area that Mitch has traveled after exactly 45 seconds is (3/2)π radians.

The option that represents this is option A) 2π. Hence, option A is the correct choice.

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Answer:

Because of the way the Sun formed

Explanation:

The original cloud was spinning, and this spin caused it to flatten out into a disk shape due contracting as gravity pulled its parts toward the center. This dust cloud rotated slowly at first but sped up as it contracted, in much the same way that a figure skater spins more quickly when she pulls her arms closer to her body. (This law of physics is known as angular momentum.) The faster rotation flattened the cloud, with the Sun at the center and planets forming within that plane

The number of joules per coulomb for 120-volt circuit is 120 joules/C.

The amount of energy transferred to each unit of charge is given by the voltage or potential difference between two points.

The unit of potential difference is the volt, which is equivalent to one joule per coulomb.

So if we have a 120-volt circuit, each coulomb of charge that flows between two points receives 120 joules of energy.

Energy per unit charge = Potential difference

= 120 volts

= 120 joules/coulomb

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Answer:

A. Perpendicular

Explanation:

Clarification:

The inquiry is inadequate as it does not have the picture of the rope wave movement.

From all that, we can say that;

The rope's are moving at the same time in a similar example without contacting one another.

This is hence a mechanical wave being made with the movement having motions that are opposite to the course of energy move of the ropes.

This is a meaning of cross over waves in light of the fact that the rope molecule movement is opposite to the wave movement.

Perpendicular describes the motion of the rope particles in relation to the motion of the rope wave shown in the photograph. Hence option A is Correct.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase.

Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase.

Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave.  Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a longitudinal wave.

In the picture we can see that wave is traveling in the direction out of the paper and rope particle is vibrating along Y axis perpendicular to the propagation of the wave.

Hence Perpendicular option is correct.

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Answer:

11.1845088571 N

Explanation:

F = k(q1q2)/(d^2)

Answer:

Explanation:

lll

Answer:

Unbalanced

Explanation:

Hussein is pushing 2 N harder.

Numerical Aperture (NA) is a measure of the ability of an optical system, such as a microscope, to gather and focus light.

The two light capturing lenses in a microscope are the objective lens and the eyepiece lens. The objective lens is located close to the object being viewed and is responsible for capturing the light that forms the image. The eyepiece lens is located close to the viewer's eye and magnifies the image produced by the objective lens.

The purpose of the condenser is to focus and direct light onto the object being viewed. It is located below the stage of the microscope and typically consists of a lens and an aperture. The aperture controls the amount of light that enters the microscope and helps to increase the resolution of the image by reducing the size of the light cone that enters the objective lens.

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The answer is weight increases

Answer:

Weight increases

Explanation:

The gravitational force increases as the size of an object increases. On the other hand, the strength of gravity is inversely related to the square of the distance between two objects

The terrestrial planets receive more heat from the Sun and have a lower gravitational pull than the Jovian planets, which receive less heat from the Sun and have a much higher gravitational pull.

Because they are large and composed mostly of gas they are sometimes called gas giants. Small amounts of rocky material are found only deep within the core of Jupiter's planet. In the solar system, Jupiter planet is farther from the Sun than the terrestrial planets and is therefore cooler.

Terrestrial planets formed from rocky and metallic planetesimals but were ultimately too small to capture the large amounts of hydrogen and helium gases abundant in the solar nebula. But Jupiter's planet formed far from the Sun where ice and rock were abundant.

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Given data

*The given mass of the cart is m = 32.0 kg

*The given acceleration of the cart is

The formula for the magnitude of the net force acting on the object is given as

Substitute the known values in the above expression as

Thus, the magnitude of the net force acting on the cart is 160.0 N and the correct option is (B)

Answer:

The height or the mass

Explanation:

The one variable that can change the potential energy of a box on the floor is either the height or the mass of the box.

Potential energy is the energy due to the position of a body.

Mathematically;

  Potential energy  = mass x acceleration due to gravity x height

Therefore, if the mass of the box is changed, the potential energy changes also.

If the position of the box is changed by raising it up, the potential energy changes

Answer:

Conduction: Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semi-conductors. Luster: Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals).

Explanation:

The net charge of a system consisting of 225 electrons and 155 protons is as follow:

The net charge of a system consisting of 225 electrons and 155 protons can be calculated by using the formula

:qnet = number of protons - number of electrons

The system has 225 electrons and 155 protons, we can substitute these values in the formula and calculate the net charge.

qnet = 155 - 225qnet = -70

Therefore, the net charge of the system is -70.

The negative sign indicates that there is an excess of electrons in the system.

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Answer:

pretty far if you ask me

a) Mutual inductance = 0.108 H; Coupling coefficient = 0.482. b) - 4.95 V.


a) Mutual inductance, M between coil A and coil B can be given as:

M = k√(L_AL_B) here, k is the coupling coefficient, L_A and L_B are the inductances of the coil A and coil B respectively. Since 54% of flux produced by coil A links coil B,

So, K = 0.54

L_A = N_A Φ/I_AL_A

= 8120 × 0.02/6

= 27.07 mH

L_B = N_B Φ/I_BL_B

= 11842 × 0.078/6

= 154.63 mH

M = k√(LALB) = 0.482 × √(27.07 × 0.15463) = 0.108 H

b) The emf induced in coil B can be given as:-

ε = M (dI_B/dt)/L_B

ε = 0.108 × (-6/0.015) / 0.15463 = -4.95 V

Thus, the emf induced in coil B when the current is reversed in 0.015 seconds is -4.95 V.

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Answer:

0 ms^-2

Explanation:

Acceleration is the change in velocity. If something is going at a constant velocity, the velocity is not changing. So, there is no acceleration.

When a car maintains a velocity of exactly 65 mph, it's acceleration​ is zero.

The acceleration is time rate of change of velocity.

When the velocity is not changing with respect to time, it is said to be an object moving with constant velocity.

At constant velocity, there is no acceleration.

Thus, when a car maintains a velocity of exactly 65 mph, it's acceleration​ is zero.

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