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The speed of the truck is approximately 8.42 m/s. The horizontal force exerted on the truck is approximately 157.64 N.

(a) The work-energy principle relates the work done on an object to its change in kinetic energy. Since the truck starts from rest, the work done on it equals its final kinetic energy:

W = \((1/2)mv^2\)

Solving for v, we get:

v = \(sqrt(2W/m) = sqrt(2(4,335 J)/(2.80 x 10^3 kg)) ≈ 8.42 m/s\)

Therefore, the speed of the truck is approximately 8.42 m/s.

(b) The horizontal force exerted on the truck can be found using the formula for work:

W = Fx

where F is the force exerted on the truck and x is the distance over which the force is applied. Rearranging this equation, we get:

F = W/x = (4,335 J)/(27.5 m) ≈ 157.64 N

Therefore, the horizontal force exerted on the truck is approximately 157.64 N.

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The formula for the mass remaining after t years for a sample of radium-226 with an initial mass of 100mg is given by \($M(t) = 100 \times 0.5^{t/1590}$\). After 1000 years, the mass is approximately 87mg. The mass will be reduced to 30mg after approximately 2167 years.

(a) The decay of radium-226 follows an exponential decay model, where the amount of radium remaining decreases by half every 1590 years. The formula for the mass remaining after t years can be derived using the half-life concept. Let M(t) represent the mass remaining after t years, then the equation can be written as \($M(t) = 100 \times 0.5^{t/1590}$\). Here, 100 represents the initial mass of the sample, and 0.5 is the decay constant derived from the half-life.

(b) To find the mass after 1000 years, we substitute t = 1000 into the formula: \($M(1000) = 100 \times 0.5^{1000/1590}$\). Evaluating this expression gives us approximately 87mg.

(c) To determine when the mass will be reduced to 30mg, we need to solve the equation \($M(t) = 30$\) for t. Substituting M(t) and rearranging the equation gives us \($100 \times 0.5^{t/1590} = 30$\). Solving this equation, we find t ≈ 2167 years. Therefore, it will take approximately 2167 years for the mass of the radium-226 sample to be reduced to 30mg.

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The reading on the scale is 882.6 N when the elevator accelerates upwards with an acceleration of 4.90 m/s².

Given that the mass of a person is 60.0 kg and the elevator accelerates upwards with an acceleration of 4.90 m/s², we have to determine the reading on the scale.

Let F be the force exerted by the scale on the person. Then, by Newton's second law of motion, the net force acting on the person is Fnet= m * a

where m = 60.0 kg is the mass of the person and a = 4.90 m/s² is the acceleration of the elevator. Hence, the net force acting on the person is given by;

Fnet = 60.0 kg * 4.90 m/s²

Fnet = 294.0 N

Therefore, the scale reading is equal to the force exerted by the scale on the person. Since the elevator is accelerating upwards, the force exerted by the scale on the person is greater than the weight of the person, which is the force of gravity acting on the person.

The force of gravity acting on the person is given by;

Fg = m * g, where g = 9.81 m/s² is the acceleration due to gravity. Hence, the force of gravity acting on the person is given by;

Fg = 60.0 kg * 9.81 m/s²Fg = 588.6 N

Therefore, the scale reading is given by the sum of the force of gravity acting on the person and the net force acting on the person;

F = Fg + Fnet

F = 588.6 N + 294.0 N

F = 882.6 N

Thus, the reading on the scale is 882.6 N when the elevator accelerates upwards with an acceleration of 4.90 m/s².

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Answer:

all of the particles are at rest (v = 0)

Explanation:

Therefore, since nothing is moving, the total momentum of the system must also be zero.

As a system consisting of two particles is known to have zero total momentum, the kinetic energy of the system will be zero as well.

Momentum is the product of a particle's mass and velocity. Momentum is a vector quantity, which means it has a magnitude as well as a direction.

According to Isaac Newton's second law of motion, the time rate of change of momentum equals the force acting on the particle.

Momentum describes the relationship between an object's mass, velocity, and direction.

Any change in momentum generates force. As a result, a change in momentum is used to calculate the force acting on the object.

Because the total kinetic energy is zero, all of the particles are at rest (v = 0). As a result, because nothing is moving, the system's total momentum must also be zero.

Thus, the statement is true.

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Answer: B

Explanation: I answered this question already at my school.

Answer:

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Explanation:

Based on the light curve in the book, the distant Type 1 supernova will become too faint to be seen approximately 270 days after reaching its peak apparent magnitude of 24.

According to the given information, the peak apparent magnitude of the distant Type 1 supernova is 24. By referring to the light curve in the book, we can estimate the duration for which the supernova remains visible. Typically, the brightness of a supernova decreases exponentially over time.

While specific light curves may vary, a rough estimate can be made. Considering the options provided, the closest estimate is approximately 270 days. This means that after the supernova reaches its peak brightness, it will gradually fade and become too faint to be observed after around 270 days.

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Answer:

If the car comes to a sudden stop, your body tends to keep moving forward.

Explanation:

Investigators measure the size of fog droplets by recording the diffraction pattern created when the droplets pass in front of a laser. The size of the central maximum in the pattern corresponds to the droplet size. This method utilizes the principles of diffraction to indirectly estimate droplet size, providing valuable information for scientific research.

To measure the size of fog droplets using the diffraction of light, investigators use a camera and a laser. The laser emits light with a wavelength of 690 nm. As the droplets pass in front of the laser, a diffraction pattern is created on a screen placed 30 cm away. The size of the central maximum in the diffraction pattern corresponds to the size of the droplets.
Diffraction occurs when light encounters an obstacle or passes through a narrow opening, causing it to spread out. In this case, the droplets act as obstacles, causing the laser light to diffract. The resulting pattern on the screen consists of bright and dark regions.
By measuring the size of the central maximum, investigators can determine the size of the fog droplets. The central maximum refers to the brightest spot in the pattern, which corresponds to the droplet passing closest to the laser. By analyzing this spot's size, the droplet size can be estimated.
This method allows researchers to indirectly measure the size of fog droplets using the principles of diffraction. It is a non-invasive technique that provides valuable information about the droplet size without requiring direct contact or sampling.
In summary, investigators measure the size of fog droplets by recording the diffraction pattern created when the droplets pass in front of a laser. The size of the central maximum in the pattern corresponds to the droplet size. This method utilizes the principles of diffraction to indirectly estimate droplet size, providing valuable information for scientific research.

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Brewster's angle is an important phenomenon in optics related to the polarization of light. The equipment setup described aims to observe the effects of reflected and refracted rays at the flat surface of a cylindrical lens.

Here's a step-by-step guide for the setup and observation: Set up the equipment: Arrange the components as shown in the setup diagram. Ensure that a single ray of light passes through the center of the Ray table. The room should be reasonably dark to clearly see the reflected ray. Observe the rays: As the incident ray of light hits the flat surface of the cylindrical lens, notice the rays produced as they are reflected and refracted. Pay attention to the angles and directions of the reflected and refracted rays. Adjust the Ray Table: Rotate the Ray Table until the angle between the reflected and refracted rays is 90 degrees. This will position the Ray Table Component Holder in line with the reflected ray. Polarizer setup: Look through the Polarizer at the filament of the light source, which will be seen reflected from the cylindrical lens. Rotate the Polarizer slowly through all angles while maintaining eye level with the reflected image. Observation: As you rotate the Polarizer, you will observe changes in the intensity of the reflected light. At a specific angle, known as Brewster's angle, the reflected light becomes completely polarized, and the intensity reaches a minimum. Take note of this angle. By following these steps and making the necessary adjustments, you can observe the effects of polarization and Brewster's angle in the setup involving the cylindrical lens and the Polarizer.

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An object's angular momentum won't change when it is rotating in a closed system without unbalanced forces, external forces, or torques. According to the law of conservation of angular momentum.

The two forces are equal in strength and move in opposite directions, which causes them to balance one another. The book is in equilibrium and won't accelerate because there aren't any unbalanced forces operating on it.

Due to unequal forces on the same side, an imbalanced force accelerates the item on which it is operating, changing its position, speed, or direction. An imbalanced force accelerates the item it is acting upon, shifting its location.

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Answer:

D.) Metal

Explanation:

light can not pass through metal.

The example of a substance which is NOT a medium is:

D. metal

It is any material substance which can propagate waves or energy.

Water is the mode of sea waves. Air is the medium through which we hear sound waves. The E.F andM.F are the vehicle of light. Individuals are the vehicle of an arena wave.

Metals are not considered as medium as they do not allow any energy to travel through them.

Thus, option D is correct.

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Answer:

Speed has no effect on voltage.

Explanation:

The voltage of the battery in your car is always 12 to 13.5 volts. It makes no difference whether the car is home in the garage or zooming down the interstate.

Answer:

Explanation:

To find the net force on particle q1, we need to calculate the force between each pair of particles and then add them together. The force between two particles is given by Coulomb's law:

F = k * (q1 * q2) / r^2

where F is the force, k is the Coulomb constant (approximately 8.99 x 10^9 N*m^2/C^2), q1 and q2 are the charges of the two particles, and r is the distance between them.

The force between q1 and q2 is:

F = 8.99 x 10^9 N*m^2/C^2 * (8.0 uC * 3.5 uC) / (0.10 m)^2

The force between q2 and q3 is:

F = 8.99 x 10^9 N*m^2/C^2 * (3.5 uC * -2.5 uC) / (0.15 m)^2

The net force on particle q1 is the sum of the two forces, which can be positive, negative or zero, depending on the direction of the force.

It's important to note that this calculation is based on the assumption that the charges are point charges, and that the forces are acting along a straight line. In real-world situations, charges are usually distributed over a certain volume, and the forces acting on the charges can be affected by various factors such as the presence of other charges or conducting materials, which can change the net force.

Answer:

number d

Explanation:

because plant need carbondioxide

If the magnetic field in an electromagnetic field is doubled, the electric field  will be double (ratio of E and B field is constant).

The relationship between the electric and magnetic fields is described by the equation \(F = (E + v B)\). The formulas \(D=E\) and \(B=H\) show how the electric displacement D and magnetic intensity H are related to the electric field and magnetic flux density in accordance with the constitutive relations.

Electric fields are created by electric charges or magnetic fields that change over time. The term "electric field" is frequently abbreviated as "e-field." Volts/meters is a unit used to express electric field strength. It is also important to consider the electric field strength unit Newtons/coulomb \((N/C)\). Charged particle motion results in the creation of magnetic fields. The field lines in a magnetic field depict the force that a magnet would encounter on its north side if it were in the field there.

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Complete question is:

By what factor does the electric field changes, if the magnetic field in an electromagnetic field is doubled?

Answer:

Parallel processing

Explanation:

It is a parallel processing because it involves the brain processing many part of problem simultaneously.

The brain natural mode of information involves performing many task .

It is also ability of the brain to simultaneously process incoming stimuli or signals of different quality. It is a part of brain's vision and divide what is seen into four major parts which are color, motion, shape, and depth.

Answer: B)  Parallel processing

Strange as it may seem, the statement in the question appears to be TRUE.  

-- Before the shot, neither the cannon nor the ball is moving, so their combined momentum is zero.  

-- Since momentum is conserved, we know immediately that their combined momentum AFTER the shot also has to be zero.

-- (20g is rather puny for a "cannonball" ... about the same weight as four nickels. But we'll take your word for it and just do the Math and the Physics.)

-- Momentum = (mass) x (velocity)

After the shot, the momentum of the cannonball is

(0.02 kg) x (100 m/s ==> that way)

Momentum of the ball = 2 kg-m/s ==> that way.

-- In order for both of them to add up to zero, the momentum of the cannon must be (2 kg-m/s this way <==) .

Momentum of cannon = (5 kg) x (V m/s this way <==)

2 kg-m/s this way <== = (5 kg) x (V m/s this way <==)

Divide each side by (5 kg):

V m/s  =  (2/5) m/s this way <==

Speed of recoil of the cannon = -- 0.4 m/s

Answer:

The distance that the honey flowed would be the dependent or outcome variable and the temperature of the honey would be the independent variable.

The dependent variable is what is being measured in an experiment. You can remember it by thinking “it depends on what you’re changing.”

The independent variable in an experiment is what is being changed. You can remember this by thinking “the Independent variable is what I as the scientist change.”

Explanation:

mark me brainliest plz

In the experiment " Temperature" is dependent variable and the distance honey flows is independent variable.

It is the factor that one can purposely control or change to observe its effect , is called independent variable.

It respond to the change in the independent variable , is called dependent variable.

Hence temperature is dependent and distance honey flow is independent variable.

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Explanation:

sorry I've got a bad hand writing but i think ull understand more with the screenshot that I've just pinned for u there

Answer:

this guy has answed ur question lol

Answer:

416 kj

Explanation:

hope it helps

Answer:

416 kj

Explanation:

For this particular problem, we are not dealing with a temperature change, rather, we are dealing with a scenario in which we are melting ice. Hence, we need to use the delta H fusion equation:

q=m⋅ΔHfus

Hope that I could help.

The voltage across the conductor is 500V.

Ohm's law states that the current through a conductor is directly proportional to the voltage across the conductor.

Here,

Current in the conductor, I = 50A

Resistance of the conductor, R = 10 Ω

According to Ohm's law,

V α I

V = IR

V = 50 x 10

V = 500 V

Hence,

The voltage across the conductor is 500V.

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The resistance of the electric heating element can be determined using Ohm's law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage across the element is given as 232 volts and the current flowing through it is 19 amperes. The correct option is 12 ohms.

Applying Ohm's law, we calculate the resistance as:

R = V / I

R = 232 volts / 19 amperes

R ≈ 12 ohms

Therefore, the resistance of the element is approximately 12 ohms. This means that for every ampere of current flowing through the element, there is a voltage drop of 12 volts. The resistance value of 12 ohms indicates that the element has a moderate level of electrical resistance, which allows it to generate heat efficiently when current flows through it. Thus, the correct option is 12 ohms.

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Governments assist in enhancing the infrastructure necessary for companies to flourish and helps business provide the goods and services that people need and want.

What is economics?

Economics is the study of how limited resources are used to create outputs, such as commodities and services, that are then distributed among individuals. Resources serve as the resources for creating outputs. Products and services are created by combining resources. The necessary raw ingredients are provided by land and natural resources. Raw materials are turned into finished products and services by labor.

Businesses perform better when they can effectively transport raw materials to factories and deliver finished goods to plants and markets. Governments assist in enhancing the infrastructure necessary for companies to flourish. Roads, bridges, rail lines, airports, seaports, energy transmission lines, and telecommunications networks are all included in this.

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The point is (1, 2, 3) and the plane is x − y + 2z = 4. Find the distance between the point and the plane. Round your answer to three decimal places.

Here's the long answer explaining how to solve for the distance between a point and a plane:We can first start by finding the perpendicular distance from the point to the plane. The shortest distance between a point and a plane is along the perpendicular line from the point to the plane.

To determine the perpendicular distance between the plane and the point, we can use the formula:distance = |ax1 + by1 + cz1 + d|/√a^2 + b^2 + c^2where (x1, y1, z1) is the point and ax + by + cz + d = 0 is the equation of the plane.Let's substitute the values into the formula:distance = |(1) - (2) + 2(3) - 4|/√1^2 + (-1)^2 + 2^2distance = 3/√6distance = 3/2.449distance = 1.225 (rounded to three decimal places)Therefore, the distance between the point (1, 2, 3) and the plane x - y + 2z = 4 is 1.225.

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The efficiency of the engine is 83.4% assuming  that the

heat capacity is 21 J/K and the universal gas constant is 0.08206 L · atm/mol/K =8.314 J/mol/K.

Efficiency is described as the often measurable ability to avoid wasting materials, energy, efforts, money, and time while performing a task.

The efficiency of the engine is given by:

E = W/Q

where;

W = the work done in the four steps,

Q = the energy input

Since there at four steps in a cycle:

E = w1+ w2 +w3+ w4/ q1+ q2+q3+q4

We calculate that the work done in the first step (isothermal expansion)

n= 1 mole, T1 = 402 K, V2 = 41.2 L, V1 = 18.5 L

We also solve for Steps 2 and 4 are constant volume processes,

We also calculate  work done in the third step (isothermal expansion) is

where;

n = 1 mol, T3 = 273 K, V4 = 41.2 L, V3 = 18.5 L

We notice that Heat enters the system only during steps (1) and (4).

The internal energy of the gas increases in step 4 but no work is done, while the internal energy is constant change in step 1 but work is done by the gas.

Cv =21 J/K, T3 = 273 K, T4 = 402 K

We Solve  for efficiency, ɛ:

ɛ = 2676.01  +0 +0 + 1879.29/ 2676.01  +0 +0 + 2709 = 83.4%.

Therefore, the efficiency of the engine is 83.4%.

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Explanation:

A concave mirror can form real, inverted images of various sizes and virtual, erect and enlarged images whereas a concave lens forms only virtual, errect and diminished images.