The wheel of moving car is driven by the engine. The car is accelerating in the direction
shown. In which direction does the frictional force act on the wheel?

According to the claim, all magnetism originates through moving electric charge.

There are always two magnetic poles. Stainless steel, iron, nickel, cobalt, and several rare earth metals are a few examples of magnetic materials. An magnetic field weakly repels diamagnetic materials like copper and gold. An magnetic field has a weak attraction for paramagnetic materials like calcium and aluminum.

Mathematically, Maxwell demonstrated how a shifting magnetic field generates a shifting electric field (and vice versa). As a result, magnetism is crucial because it helps humans produce electrical energy. In actuality, spinning magnets are the source of the majority of the energy we consume today.

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Answer:

[tex]\huge\boxed{\sf K.E. = 16 \ J}[/tex]

Explanation:

Mass = m = 3 kg

Speed = v = 4 m/s

Kinetic Energy = K.E = ?

[tex]\displaystyle K.E. =\frac{1}{2} mv^2[/tex]

[tex]\displaystyle K.E. =\frac{1}{2} (3)(4)^2\\\\K.E. =\frac{1}{2} (3)(16)\\\\K.E. = (2)(8)\\\\K.E. = 16 \ J\\\\\rule[225]{225}{2}[/tex]

The energy output is 714 Watts is loss.

According to the thermal conductivity equation, the rate of heat loss H is given by:

H=\swhere,

K is the heat conductivity coefficient.

A is for Area of Cross Section.

H = Heat loss rate

Temperature differential between the two sides of the body in the given situation: x-Thickness of the material 71 -1

T = 37°C, or body temperature, and 12°C, or room temperature

initial instance.

A=2m x=0.01 m

H=174watt

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The option that would not increase the power needed by the boy to move the block is "Increase the time of the block was slid".

Option D is the correct answer.

The power applied by the boy to push the block across the 10 m rough surface is the measure of the energy expended over a given time interval.

Mathematically, the power applied by the boy is given as;

P = E/t

where;

P = (F x d)/t

where;

According to Newton's second law of motion, the applied force is given as;

F = ma

P = (ma x d) / t

where;

From the formula above, the following will increase the power needed by the boy to move the block.

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Bay Medical Company's genetic researchers are interested in spiders with medium silk flexibility. They believe this silk can be employed in medical applications such as stitching and constructing artificial tendons.

Siblings may inherit various features from their parents and from each other depending on the specific gene combinations that each seeds carries. The variance in silk inflexibility among spider seed is explained by random gene recombination.

The inflexibility of silk is another issue. This point is shared by all of Darwin's dinghy spiders (they all have spider silk with some flexibility), yet some spiders create silk that is more flexible than other spiders' silk. There are three levels of silk inflexibility: high, medium, and low.

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Answer:

Explanation:

The reaction force to the action force during a rocket launch would be the force exerted by the ground or launch pad on the rocket. The action force is the force of explosion from the burning fuel and expanding gases, which propels the rocket upward. The reaction force is the force exerted by the ground or launch pad in response to this action force, which keeps the rocket grounded and prevents it from moving. The action and reaction forces are equal in magnitude but opposite in direction, and they act on different objects. The action force acts on the rocket, while the reaction force acts on the ground or launch pad.

The object that had a mass of 4 kilograms and was lifted at a rate of 3 m/s has a greater kinetic energy.

We know that the kinetic energy has to do with the energy of an object that is in motion. Thus the kinetic energy is the energy that is said to be possessed by a moving object.

In the first case we have;

Kinetic energy = 1/2 mv^2 = (0.5 * 2 * 2^2)

= 4 J

In the second case;

Kinetic energy =  1/2 mv^2 = (0.5 * 4 * 3^2)

= 18 J

The second object had more kinetic energy.

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The velocity of the football thrown is approximately 23.76 meters per second.

Momentum is simply the product of the mass of an object and its velocity.

This is expressed as;

P = m × v

Where m is the mass of the object and v is its velocity.

Given that;

Plug the given values into the above formula and solve for v.

P = m × v

v = P / m

v = 10.1kgm/s / 0.425kg

v = 23.76 m/s

Therefore, the velocity of the ball is 23.76 m/s.

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The tangential velocity must block a have so that block b remains at the same height under the table is rw.

[tex]Vtan=Rw\\\\R=path\\\\w=angular- velocity\\\\Vtan=Tangential-Velocity[/tex]

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Answer: A scientific law describes a natural occurrence, but doesn't attempt to clarify how the event occurs. Or there is an 'if, then' statement that can be made and tested.

Answer: Scientific law are principles that are accepted by an overwhelming majority of scientists. Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena.

Explanation: Hope this was helpful

If a pencil goes from such a perfectly vertical position while maintaining its angular acceleration, the time it takes for it to hit the ground is 0.4299s.

Angular acceleration is the term used to describe the temporal pace at which angular momentum varies. The formulae per cent per seconds measure unit is the norm. Therefore, = d d t. Angular velocity is also known as rotating acceleration.

Angular acceleration is measured in rad/s/s, or rad/s2. If grows, then the result is good. If falls, then falls is negative.

angular acceleration, τ = I α

Wr = I α

sin 10 = r / (L/2)

r = L/2 sin 10

A inertia moment will then occur:

I = 1/3 M L²

αf = 3/2 g / L sin 10

α = [3/2 × 9.8] / [0.150 sin10]

α = 17 rad/s²

θ = π / 2

t = √(π / α )

t = √(π / 17)

t = √3.142 / 17

t = 0.4299s

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The 400 A current flowing through the wire will be going the other way from the other wire.

An electroscope is a straightforward instrument that consists of a metal piece protruding from a glass jar with thin metal leaves suspended inside. This design demonstrates the electrostatic repulsive force. The leaves spread apart by the Coulomb force when a charged body touches the external metal piece.

We will apply the equation to determine the current in the other wire

F/l = µ₀I₁I₂/2πr and solve it for I₂.

The other wire's current will flow in the opposite direction to the first one because the force is repulsive.

I₂ = F.2πr/µ₀I₁l

I₂ = 4×2π×0.05m/4π×10⁻⁷T.m/A×1000A×2.50m

I₂ = 400 A.

The 400 A current flowing through the wire will be going the other way from the other wire.

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The RMS current , Power and Maximum voltage have values 0 to 1 , V1/2 to 0 and infinity to zero.

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Answer:

I don't know

Explanation:

I don't know

Grid-Tied Residential Solar Cells energy technique (or technology(s)) can keep producing electricity after the sun sets for a while.

Solar energy collectors and photovoltaic solar systems are two ways that human ingenuity has created to harness solar energy and convert it into electricity. A solar thermal process utilizes the heat from the sun to create steam, which powers a turbine and ultimately creates electricity.

In addition to the components that convert the immediate (DC) electricity generated by modules into the ac current (AC) electricity needed to power all of the home's appliances, systems also feature mounting structures that guide panels toward the sun.

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Grid-Tied Residential Solar Cells energy technique (or technology(s)) can keep producing electricity after the sun sets for a while.

Solar energy collectors and photovoltaic solar systems are two ways that human ingenuity has created to harness solar energy and convert it into electricity. A solar thermal process utilizes the heat from the sun to create steam, which powers a turbine and ultimately creates electricity.

In addition to the components that convert the immediate (DC) electricity generated by modules into the ac current (AC) electricity needed to power all of the home's appliances, systems also feature mounting structures that guide panels toward the sun.

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The displacement current is 0.28125 C/s and the magnitude of the magnetic field is 2T.

Magnetic field strength is a quantitative measure of the strength or weakness of a magnetic field.

According to the displacement current and the Biot-Savart law, the displacement current and magnetic field can be calculated.

radius of the circular plate = R = 16.0

radius of circular loop = r = 21.0 cm

rate of charge =  (dq/dt) = 8 C/s

displacement current id = (dq/dt) * [tex]\pi r^{2}[/tex] / [tex]\pi R^{2}[/tex]

since r > R therefore in displacement current the formula can be changed as

id = (dq/dt) * [tex]\pi R^{2}[/tex] / [tex]\pi R^{2}[/tex]

id = (8) * [tex]\pi 16^{2}[/tex] / [tex]\pi 16^{2}[/tex]

id = 0.28125 C/s

magnetic field can be calculated by B = μ₀I/2πr

μ₀ = 4[tex]\pi[/tex] * [tex]10^{-7}[/tex] H/m

i = id = 0.28125 C/s

r = 3.0 cm

B = {4[tex]\pi[/tex] * [tex]10^{-7}[/tex] * 0.258125} / 2*[tex]\pi[/tex]*3*[tex]10^{-2}[/tex]

B = 1.87 T

B ≈ 2 T

The displacement current through a circular loop of radius r = 3.00 cm is 0.28125 C/s.

The magnitude of the magnetic field between the capacitor plates at a radius r = 3.00 cm from the axis of the capacitor is 2T.

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According to the given statement is the 59.21° angle was her force directed.

The word "force" has a specific meaning in science. At this level, calling a force a shove or a pull is entirely appropriate. A charge is not really something an object "has in it" or that it "contains." One thing experiences a force from another. Living organisms or inanimate objects are not the only things that can be considered forces. Every time two items interact, a force is exerted on every one of the objects. The force is no longer felt by the two objects when the interaction ends.

Work done = force × distance

236J = 18.9cos(o) × 24.4

236/24.4 = 18.9cos(o)

(0.5117)cos^-1 = (o)

59.21°

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The energy can neither be created nor destroyed. It can be transformed from one form to another.

The law of conservation of energy states that, the total energy of an isolated system remains constant and it is said to be conserved over time. This means that the system always has the same amount of energy unless added from outside.

In the above question, it is asked if law of conservation of energy can be applied on a roller coaster. The answer is yes. On a roller coaster, energy changes from potential to kinetic and back again repeatedly over and over the course of the ride.

The two forms of energy which are important on a roller coaster are gravitational potential energy and kinetic energy. The roller coaster has the greatest amount of potential energy at the top of the first hill as it is the highest point of the roller coaster.

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The angular velocity of a car tire is 1 rad/s.

What is angular velocity?

Angular velocity is the speed at which the angle between two bodies changes when an object rotates or revolves around an axis. This displacement is depicted in the image by the angle formed by a line on one body and a line on the other.

We know,

Angular velocity = ω = [tex]\frac{V}{R}[/tex]

Given,

V = 30 m/s

R = 30 cm

Putting values in the formula

ω = [tex]\frac{30}{30}[/tex] rad/s

= 1 rad/s.

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The statement that is true about circular motion is that; the net force on the object is directed toward the center of the circular path. Option D

We know that the circular motion is the kind of motion that occurs along a circular path. We know that in a circular motion, the direction of the motion is also important.

Now we know that the whirling of a stone around a circular path is one of the very typical examples of a circular motion in the context of our discussion here.

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Which statement is true about an object that is traveling in uniform circular motion? O A. The speed of the object varies. O B. The direction of the object's velocity is constant. OC. The net force on the object is directed away from the center of the circular path. O D. The net force on the object is directed toward the center of the circular path.

If a child on a swing has a center of gravity 4.54 m just below pivot, it takes her T =4.05s to complete one swing.

But in a larger sense, gravity is a force because it represents the interaction that happens when two masses are in close proximity to one another. Fundamentally, the warping of reality and the motion of entities through the stretched spacetime are what produce gravitational effects. However, the outcome appears to be the result of applying force.

Dr. Ryan Stone, played by Sandra Bullock, returns to Earth at the end of "Gravity" and crashes into a lake. After taking off her spacesuit, Dr. Ryan swims towards the surface but initially finds it difficult to stand up straight.

Briefing:

T=2π√(l/g)

T=2π√(4.54/9.81)

T=4.052s

T =4.05s

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The efficiency of a 10 hp DC motor that draws 31 A at 300 volts is equal to 80 %.

The efficiency of a motor can be calculated from the ratio of the mechanical power output to the electric power input to the motor.

Given the horsepower of the DC motor = 10 hp

Conver the hp into watt:

1hp = 745.7 W

Output power = 10 hp = 10× 745.7 = 7457 W

Input power = 31 × 300 = 9300 W

The efficiency of the motor = Output/Input ×100

Efficiency = (7457/9300) ×100 = 80 %

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The mass of an 8oz styrofoam cup is approximately 227 grams .

The mass of a substance is a measure of the quantity of matter present in that substance,

The mass of a substance is measured with a chemical balance and is independent of gravity. The SI  unit of the mass of a substance is the kilogram. kg.

Other smaller multiples of the kg include grams, milligrams, centigrams, etc.

Some other unit of measurement of the mass of a substance is ounces (oz), pounds (lb), tonnes (t), etc.

The conversion from ounces to gram is 1 oz = 28.3495 grams

Hence, 8 oz = 8 * 28.3495 grams

8 oz = 226.796 grams or approximately 227 grams

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Answer:

6.88 m/s

Explanation:

The Conservation of Energy states that:

Initial Kinetic Energy + Initial Potential Energy = Final Kinetic Energy + Final Potential Energy

So we can write

[tex]mgh_{i}+\frac{1}{2}mv_{i} ^{2}=mgh_{f}+\frac{1}{2}mv_{f} ^{2}[/tex]

We can cancel the common factor of [tex]m[/tex] which leaves us with

[tex]gh_{i}+\frac{1}{2}v_{i} ^{2}=gh_{f}+\frac{1}{2}v_{f} ^{2}[/tex]

Lets solve for [tex]v_f[/tex]

[tex]gh_{i}+\frac{v_{i} ^{2}}{2}=gh_{f}+\frac{v_{f} ^{2}}{2}[/tex]

Subtract [tex]gh_f[/tex] from both sides of the equation.

[tex]gh_{i}+\frac{v_{i} ^{2}}{2}-gh_{f}=\frac{v_{f} ^{2}}{2}[/tex]

Multiply both sides of the equation by 2.

[tex]2(gh_{i}+\frac{v_{i} ^{2}}{2}-gh_{f})={v_{f} ^{2}[/tex]

Simplify the left side.

Apply the distributive property.

[tex]2(gh_{i})+2\frac{v_{i} ^{2}}{2}+2(-gh_{f})={v_{f} ^{2}[/tex]

Cancel the common factor of 2.

[tex]2gh_{i}+v_{i} ^{2}-2gh_{f}={v_{f} ^{2}[/tex]

Take the square root of both sides of the equation to eliminate the exponent on the right side.

[tex]{v_{f}=\sqrt{2gh_{i}+v_{i} ^{2}-2gh_{f}}[/tex]

We are given [tex]g,v_{i},h_{i},h_{f}[/tex].

We can now solve for the final velocity.

[tex]{v_{f}=\sqrt{(2*9.81*2.41)+(0^{2})-(2*9.81*0)[/tex]

Anything multiplied by 0 is 0.

[tex]{v_{f}=\sqrt{2*9.81*2.41[/tex]

[tex]{v_{f}=\sqrt{47.2842[/tex]

[tex]v_f=6.88[/tex]

Answer:

because they can all blend in with different surroundings

The greater value of work for object A can be true if object B is pushed at a much smaller distance. Therefore, option B is correct.

Work can be described as the energy utilized when a force is exerted to move a body through a specific distance. The work done describes both the exerted force as well as the displacement of the object.

The action of the applied force is to move a system in a straight line in the direction of the exerted force over a distance 'd'.

W= F ×d

Where 'd' is the displacement by an object, F' is the exerted force, and W is work done.

Given the force experienced by the object B is greater than object A:

[tex]F_{B} > F_A[/tex]

Now we know that the work done only depends upon the force and distance. In order to have a greater value of the work for object A. Object B is pushed a much smaller distance than object A.

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No, if The cross-sectional diameter of a vessel increases in an aneurysm. Considering that blood is roughly non-viscous and incompressible and that there is a laminar flow,

A non-viscous fluid is one that offers zero resistance to internal friction or has no resistance at all. A fluid is described as being viscous if there is greater flow resistance.

Because of their high viscosity, some liquid, like pitch, glass, and peanut butter, act like solids. A liquid is referred to as "viscous" in common parlance if it has a viscosity that is clearly higher than water, and "mobile" if it has a viscosity that is noticeably lower.

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A solid sphere of radius R is placed at a height of 40 cm on a 15∘ slope. It is released and rolls, without slipping, to the bottom. A circular hoop of radius R be released on the same slope in order to equal the sphere's speed at the bottom with height of 57.14 cm

The height that a circular hoop should be released can be calculate as follows:

Generally the equation for the potential energy of the sphere is mathematically given as

mgh= 1/2Iw² =1/2 mv²

where,

inertia of sphere

I = 2/5 mr²

and

angular velocity

w = v/r

therefore, we can input inertia of sphere and angular velocity to potential energy equation

mgh= 1/2Iw² =1/2 mv²

mgh = 1/2 ( 2/5mr²) ((v/r)² + 1/2mv²

mgh = 1/2 ( 2/5(v/r)²mr²) + 1/2mv²

mgh = 1/5 mv² +  1/2 mv²

mgh = 7/10 mv²

v² = 10gh

        7

generally the equation for the inertia of circle of sphere is mathematically given as

I = mr²

mgh = mv²

h = v²/g

therefore h = 10gh/7

                        g

h = 57.14 cm

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The height above the surface of the earth should be [tex]2.294 * 10^{6} m[/tex].

The Acceleration due to earth gravity is known as the acceleration due to gravity. It means when an object falls from a certain height towards the surface of the earth, its velocity changes. The change in velocity produces the acceleration in the object is called the gravitational acceleration

We know that acceleration due to gravity at height h is given by : [tex]g' = GM/(R+h)^{2}[/tex]

Where, G = gravitational constant = [tex]6.67 * 10^{-11}[/tex]

            M = mass of earth = [tex]5.97 * 10^{24} kg\\[/tex]

             R = radius of earth = [tex]6.38 * 10^{6} m[/tex]

             h = height

Given g' = 0.54

Putting these values in above equation  we get h = [tex]2.294 * 10^{6} m[/tex]

i.e. to experience an acceleration of 0.54g , the object should be at [tex]2.294 * 10^{6} m[/tex] above the earth's surface.

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Answer:k

Explanation:k

k