A physical therapy exercise has a person shaking a 5.00 kg weight up and down rapidly. if the barbell is moving at 4.50 m/s, what is the magnitude of the force required to stop it in 0.333 seconds?

The question is maya most likely trying to answer is, how does the thickness of the wire affect the strength of an electromagnet?

From the experimental set-up by maya, we can determine the effect of thickness of wire on strength of electromagnet.

R ∝ 1/A

where;

As the thickness of the wire increases, the area of the wire increases and the resistance of the wire will decrease. As the resistance of the wire decreases, the current flowing in the wire increases as well.

Thus, the increase in the thickness of a wires increases, the strength of an electromagnet.

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Answer:

A

Explanation:

A box exerts a force of 420 N on a floor. If the square box measures 0.5 m on each side. Pressure does it place on the floor is 1680 N/m².

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Pressure is force per unit area so,

pressure = 420/.25

pressure = 1680 N/m²

A box exerts a force of 420 N on a floor. If the square box measures 0.5 m on each side. Pressure does it place on the floor is 1680 N/m².

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Answer: 625000 J

Explanation:

KE= (1/2)mv^2

m=500kg

v=50m/s

KE= (1/2 )(500)(50)^2

= 625000 J

According to Newton's law of cooling, The formula that models the cooling of the turkey is T(t) = (165 - 75) * e^(k * t) + 75. The temperature of the turkey 50 minutes after it leaves the oven will be approximately 118°F.

(a) The formula that models the cooling of the turkey is T(t) = (165 - 75) * e^(k * t) + 75.

In this case, the temperature difference between the turkey and the room, when it came out of the oven, is A = 165 - 75 = 90°F, and Ts (the temperature of the room) is 75°F. By substituting these values into the equation T(t) = A * e^(k * t) + Ts, we get T(t) = 90 * e^(k * t) + 75.

To find the value of k, we can use the information that when t = 30 minutes, T(30) = 145°F. Substituting these values into the equation and solving for k, we have 145 = 90 * e^(k * 30) + 75. Rearranging and solving, we find k ≈ -0.0207.

(b) The temperature of the turkey 50 minutes after it leaves the oven will be approximately 118°F.

To calculate the temperature at t = 50 minutes, we can use the formula T(t) = 90 * e^(-0.0207 * t) + 75. Substituting t = 50, we have T(50) = 90 * e^(-0.0207 * 50) + 75. Evaluating this expression, we find T(50) ≈ 118°F.

(c) It will take approximately 145 minutes for the turkey to cool to 110°F.

To determine the time it takes for the turkey to reach a temperature of 110°F, we can rearrange the equation T(t) = 90 * e^(-0.0207 * t) + 75 and solve for t. So, 110 = 90 * e^(-0.0207 * t) + 75. Solving this equation, we find t ≈ 145 minutes.

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Answer:

Damp Proofing:

Explanation:

The presence of damp proofing is very necessary to maintain the health of a structure. DPC plays an important role in all types of buildings and it should be necessary to know about the importance, requirements, and properties of DPC. In many of the buildings all over the world, the rising damp may be due to a damaged damp-proof course, or sometimes, there may be not any damp proof course in a building.

Answer: 1 degree

Explanation:  I looked it up.

Answer:

Cracking of an egg is a physical change since the egg and the stuff inside does not change but the shape or appearance of the shell changes.

Explanation:

Hope it helps

The ball is at its lowest point, which means that the tension in the string is greater than the ball's weight.

Tension is defined as the force in a stretched object that is pulling against the force that is causing the stretch. The magnitude of the force that is pulling on an object is the tension in the object.

The tension in a string is the force that is pulling on the string. When the string is pulled, the tension increases. The tension in a string depends on the force that is pulling on the string.

The weight of the ball is the force that is pulling on the string. When the ball is at its lowest point, the tension in the string is greater than the ball's weight.

This is because the force of gravity pulling down on the ball is greater than the tension in the string which is causing the ball to move up.

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The magnitude and direction of the forces is 13 N and  22.6⁰ respectively.

The magnitude of the forces is calculated by applying Newton's second law of motion as follows;

F = √ (Fx²  + Fy² )

where;

F = √ ( 12² + 5² )

F = 13 N

The direction of the force is calculated as follows;

tan θ = Fy / Fx

where;

tan θ = 5 / 12

tan θ = 0.4167

θ = arc tan (0.4167)

θ = 22.6⁰

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Answer:

its the last question

Explanation:

Thats because erosion takes away stuff

Answer:

D

Explanation:

Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.

The three fundamental particles in an atom are protons, neutrons, and electrons. Protons have a positive charge and are located in the nucleus of the atom, along with neutrons, which have no charge. Electrons have a negative charge and orbit the nucleus. The number of protons in an atom determines its atomic number, which in turn determines the element to which it belongs.

The number of electrons in an atom determines its chemical properties, as they are involved in chemical bonding with other atoms. The charges of the particles are important in determining the behavior of atoms in chemical reactions and in the formation of molecules and compounds.

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--The complete question is, Which fundamental particles have positive charges, and which have negative charges?--

parallel circuits is used in  the house.

For household circuits, parallel circuits are always used because: In parallel circuits, all other electrical appliances continue to operate correctly even if one electrical appliance stops functioning for whatever reason. In a parallel circuit, each electrical appliance has its own switch, allowing it to be switched on or off independently without impacting other appliances. In a parallel circuit, every electrical device receives the same voltage as the power supply line.

When electrical devices are linked in parallel, the overall resistance of the home circuit is decreased, causing a large current to flow from the power source.

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Based on the explanation deduced, we can conclude that the work vector points in the negative direction. Hence, the first option aligns with the a

In the given problem, the work done by a force on an object is calculated to be -16 Joules. This means that the object moved in the negative direction, and the work vector points in the negative direction. It doesn't necessarily imply that the force vector also pointed in the negative direction.

The object's displacement and the force vector not pointing in the same direction doesn't also imply that the work done will be negative. The formula for work is given as:

Work = Force x Distance x cos θ, where,θ is the angle between the force vector and displacement vector of the object. If the force and displacement vectors are in the opposite direction, then the angle between them will be 180°.

In that case, cos 180° = -1, which makes the work done negative. This is why we have a negative work done value in the given problem. 

Therefore, we can conclude that the work vector points in the negative direction, but we cannot determine the direction of the force vector without knowing the angle between the force vector and displacement vector.

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Answer: heyyy want to talk your question

Explanation:

Speed (in m/s) when it is at a height of 1.23 meters above the floor will be 2.73 m/s

The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors is called Potential energy

Potential energy when h1= 1.61m will be : mgh1 = mg(1.61)

Potential energy when h2= 1.23m  will be : mgh2 = mg(1.23)

the change in potential energy will be converted to kinetic energy :

mgh1 - mgh2 = 1/2 m \(v^{2}\)

mg(h1-h2) = 1/2 m \(v^{2}\)

g(h1 - h2 ) = 1/2 \(v^{2}\)

9.8 (1.61 - 1.23 ) = 1/2 \(v^{2}\)

\(v^{2}\) = 7.448

v= 2.73 m/s

Speed (in m/s) when it is at a height of 1.23 meters above the floor will be 2.73 m/s

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The higher pressure will be produce secondly area of contact will be smaller area of contact than blunt nails. and friction is affected by three factors.

The tip with the smallest area will produce a higher pressure when a small force is applied.

The force per unit area is referred to as the pressure. i.e. P=F/A Therefore, the pressure is a function of the contact area A and the force F. Sharp-tipped nails have a much smaller area of contact than blunt (non-sharp) nails, hence they exert more pressure with relatively tiny forces.

The adhesion between body surfaces, surface roughness, and deformation of the bodies are the three basic determinants of the frictional force between two bodies.

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There are lots more but these are the best

Answer:

a) transparent

b) transparent

c) opaque

Explanation:

In the first one, the light rays go completely through, so it is transparent.

The second one I'm not too sure about. It is refraction so it's going through a different material, but the fact that it went through makes me say transparent.

Last one, the light rays are reflecting off the surface so it's opaque.

Please feel free to correct me if I'm wrong. This is just my understanding

Answer:

7 meters away

Explanation:

12 x 1.5 = 18

25 - 18 = 7

Answer:

Vectors are often represented by arrows. When using an arrow to represent velocity, the length of the arrow stands for speed, and the way the arrow points indicates the direction.

A changing electric field is induced by changing magnetic field.

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. Electric charges in motion create magnetic fields. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field. Tesla is the magnetic field intensity unit in the International System (SI) (T). The region around a magnet where the magnetic force manifests itself is known as the magnetic field. Electrical charges can move and create magnetic fields.

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There is a basic difference, because mass is the actual amount of material contained in a body and is measuredin kg, gm, etc. Whereas weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything but weight is different on the earth

Mass is the matter in a material, while weight is the measure of how the force of gravity acts upon that mass.

The initial velocity of a car that reached 32 m/s in 3.4 at a rate of 2.6 m/s  is 23.16 m/s.

Velocity is described as the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.

The given parameters include:

final velocity: 32 m/s

time: 3.4 seconds

acceleration = 2.6 m/s

V = u + at

32 = u + 3.4 * 2.6

32 = u + 8.84

32- 8.84 = u

initial velocity = 23.16.

So the initial velocity of the car that travels 32m/s in 3.4 at a rtae of 2.6 m/s is 23.16 m/s.

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I) Tension in the spring = 2N

ii) Angular speed of the bung=5 rads-¹

iii) The time(T) it takes to make one complete revolution=1.256 seconds

Formula used to calculate the time(T) it takes to make one complete revolution = 2π √(l/g)

l = radius= 40cm = 0.4m

g = acceleration due to gravity = 10m/s-²

π =3.14( constant)

T = 2× 3.14 × √0.4/10

T = 6.28 ×√0.04

T = 6.28 × 0.2

T= 1.256 seconds

Formula to calculate angular speed(w)= 2π/T

where T= 1.256 secs

Therefore w = 2×3.14/1.256

w = 6.28/ 1.256

w = 5 rads-¹

Formula to calculate Tension in the spring(F)

= mrw²

where m= 200 g = 0.2kg

r = radius= 40cm = 0.4m

w = angular speed = 5 rads-¹

Therefore F = 0.2 × 0.4 × 5²

= 0.08 ×25

= 2N

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Explanation:

First we have to descompose velocity, and get Velocity of X and Y side:

Vx = V * cos 30°

Vx = 3 m/s * 0,866...

Vx = 2,598 m/s

Vy = V * sen 30°

Vy = 3 m/s * 0,5

Vy = 1,5 m/s

Lets calculate time of fly:

Firat, lets calulate up time:

uT = (Fv - Iv) / g

uT = (0 m/s - 1,5 m/s) / -9,8 m/s^2

uT = -1,5 m/s / -9,8 m/s^2

uT = 0,15 s

Like up time is equal to down time, time of fly will be:

T =uT + dT

T = 0,15 s + 0,15 s

T = 0,3 s

Now for calculate how far will reach, lets aplicate the formula:

d = Vx * T

d = 2,598 m/s * 0,3 s

d = 0,779 meters

Will reach 0,779 meters

Gud luck

The correct option is D. The electrical forces grow larger as temperature increases. Because, The greater the electric field strength, the greater the force applied to the liquid, which causes it to eject more quickly.

The speed at which a liquid is ejected from an electrospray ionization source depends on the electric field strength, surface tension, and viscosity of the liquid. The electric field strength is determined by the voltage applied to the liquid. As the temperature of the solution increases, its viscosity decreases, allowing it to flow more easily. This means that the electrical forces on the liquid are greater at higher temperatures, causing it to be ejected more quickly. Hence Correct option is : D.

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Explanation:

The potential energy of an object has the following formula

         Potential energy = mgh

      where m = mass of the object

                   g = acceleration due to gravity

                   h = height of the object

This means that the potential energy of an object depends upon its mass, acceleration due to gravity, and height.

In the given situation we have a bucket full of water. If the mass and acceleration due to gravity are not changed, the only way the potential energy can be decreased is by reducing the height of the bucket full of water.

This can be done by: -

         (i) Lifting the bucket full of water in such a way that you

             decrease its height as compared to the bench.

        (ii) Put the bucket full of water on a stool whose height is

            lower than the bench.

Answer:

1.By decreasing it's contents- this decreases the weight of the bucket thus decreasing the potential energy of the bucket.

2.By decreasing the height of the bench we have decreased the amount of potential energy stored in the bucket

The equivalent resistance of the circuit is 0.5 Ω.The correct option is b

Given Data: Five resistors, each 10 Ω.Resistors are connected in parallel to a voltage source.

To calculate the equivalent resistance of the circuit, we use the formula:Req = R1R2R3...Rn/R1+R2+R3+...+Rnwhere,R1, R2, R3, .... Rn are the resistors in parallel.

The formula to calculate equivalent resistance is given byReq= 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5 = 1/10 + 1/10 + 1/10 + 1/10 + 1/10 

= 5/10 

= 1/2 Ω or 0.5 Ω

Therefore, the equivalent resistance of the circuit is 0.5 Ω.The correct option is b

The equivalent resistance of the circuit is 0.5 Ω.

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That depends on what word you skipped at the beginning of the question.

If it's supposed to be "Potential" energy, then the statement is false.**

If It's supposed to be "Kinetic" energy, then the statement is true.

** It's also false if the missing word is "Chemical", "Mechanical", "Thermal", "Nuclear", "Electrical", "Electromagnetic", or "Nervous".)

The correct classification of each substance is as follows:

A conductor is a substance that can transmit electricity, heat, light or sound while an insulator is a substance that does not transmit heat, sound or electricity.

Conductors are usually metals while insulators are usually non-metals. Examples of conductors include;

Examples of insulators include;

Therefore, the correct classification of each substance is as follows:

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Answer:

Explanation:

E2020