a circuit consist of four resistor in parallel with a battery three resistors have resistance of 1 ohms ,2 ohms and 3 ohms , respectively, the total resistance the circuit is 0,5 ohms and the current through the 1 ohms resistor is 4A
​

what is the value of fourth resistor

part a.

The student’s speed just after losing contact with the spring  is 14.14 m/s

part b.

The students can go up to 32.06cm

Speed is described as one such measurable quantity that measures the ratio of the distance travelled by an object to the time required to travel that distance.

Given values:

We apply the conservation of energy, energy in the compressed string:

1/2 mv2 = 1/2 kx²v²

which will be [tex]\sqrt{kxv}/m[/tex]

substituting we have the value as 14.14 m/s

part b.

then conservation of energy equation will become:

1/2 kx² + mgh

substituting we have the value as 32.06cm

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.

The electric field at the y-axis position is -10.0 N/C and is oriented towards the negative charge and electric potential at the point on the y-axis is -0.5 V..

To calculate the electric potential and electric field at the point on the y-axis, use equations for electric potential and electric field due to an electric dipole:

Electric potential V = kq/(r_+) - kq/(r_-)

Electric field E = kq/(r_+)² - kq/(r_-)²

where k = Coulomb constant,

q = charge of each point charge,

r_+ = distance from the positive charge to the point on the y-axis, and

r_- = distance from the negative charge to the same point on the y-axis.

Using the given values:

r_+ = √((0.01 m)² + (0.1 m)²) = 0.1005 m

r_- = √((0.008 m)² + (0.1 m)²) = 0.1002 m

q = 3.0 μC

Electric potential:

V = (9.0 x 10⁹ N·m²/C²)(3.0 x 10⁻⁶ C)/(0.1005 m) - (9.0 x 10⁹ N·m²/C²)(3.0 x 10⁻⁶ C)/(0.1002 m)

V = 215.6 V - 216.1 V

V = -0.5 V

The electric potential at the point on the y-axis is -0.5 V.

Electric field:

E = (9.0 x 10⁹ N·m²/C²)(3.0 x 10⁻⁶ C)/(0.1005 m)² - (9.0 x 10⁹ N·m²/C²)(3.0 x 10⁶ C)/(0.1002 m)²

E = 2705.6 N/C - 2715.6 N/C

E = -10.0 N/C

The electric field at the point on the y-axis is -10.0 N/C, directed towards the negative charge.

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Answer:

4161 J/kg·°C

Explanation:

We can use the principle of conservation of energy to solve this problem, which states that the total heat energy in a closed system is constant. The heat lost by the tea is equal to the heat gained by the milk.

Let's first calculate the heat lost by the tea:

Q(tea) = mcΔT

Q(tea) = (0.27 kg)(3910 J/kg·°C)(90.0°C - 85.0°C)

Q(tea) = 6555 J

where m is the mass of tea, c is the specific heat of tea, and ΔT is the change in temperature.

Next, let's calculate the heat gained by the milk:

Q(milk) = mcΔT

Q(milk) = (0.02 kg)(c)(85.0°C - 6.0°C)

Now we can equate the two expressions:

Q(tea) = Q(milk)

6555 J = (0.02 kg)(c)(79.0°C)

Solving for c, we get:

c = 4161 J/kg·°C

Therefore, the specific heat of milk is approximately 4161 J/kg·°C.

Answer:

Answer is down below…

Explanation:

A force does not always bring a change in motion of an object. For instance, if you push the walls of the room with your hands, the walls do not move. Sometimes force changes the shape and size of an object without any change in the state of motion of an object. Q.

Ohm's law states that the voltage (V) over a resistor is break even with to the item of the current (I) streaming through it and its resistance (R), or V = I*R.

To discover the resistance required to have an amperage of 7.0 A with a voltage supply of 210 V, able to improve the condition to unravel for R:

R = V/I

Stopping within the values we know:

R = 210 V / 7.0 A

R = 30 ohms

Subsequently, the understudy will require a resistance of 30 ohms to attain an amperage of 7.0 A with a voltage supply of 210 V.

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While the use of parentheses to indicate the number of a particular group of atoms in a compound can be helpful, it is not strictly necessary for writing a correct chemical formula.

There are several rules that should be followed when writing chemical formulas, but one of the unnecessary rules is the use of parentheses to indicate the number of a particular group of atoms in a compound. For example, the formula for magnesium carbonate can be written as MgCO₃ or as Mg(CO₃)₂, where the parentheses indicate that there are two carbonate ions present.

While the use of parentheses can make it clearer which group of atoms is being referred to, it is not necessary for writing a correct chemical formula. The number of each type of atom in the compound can be determined from the compound's name or from knowledge of the properties of the elements involved.

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The net force on q₂ will be  1.07 x 10⁻² N, pointing to the left.

To find the net force on particle q₂, we need to calculate the force due to q₁  and q₃ individually and then add them up vectorially. We can use Coulomb's law to calculate the force between two point charges:

F = k × (q₁ × q₂) / r²

where F is the magnitude of the force, k is Coulomb's constant (k = 8.99 x 10⁹ Nm²/C²), q1 and q2 are the charges of the two particles, and r is the distance between them.

The force due to q₁ on q₂ can be calculated as:

F₁ = k × (q₁ × q₂) / r₁²

where r1 is the distance between q₁ and q₂ (r₁ = 0.180 m).

Similarly, the force due to q₃ on q₂ can be calculated as:

F₂ = k × (q₃ × q₂) / r₃²

where r₃ is the distance between q₂ and q₃ (r₃= 0.230 m).

The direction of each force can be determined by the direction of the electric field due to each charge. Since q₁ and q₃ have opposite signs, their electric fields point in opposite directions. Therefore, the force due to q₁ points to the left and the force due to q₃ points to the right.

To find the net force, we need to add up the forces vectorially. Since the forces due to q₁ and q₃ are in opposite directions, we can subtract the magnitude of the force due to q₃ from the magnitude of the force due to q₁ to get the net force on q₂:

Fnet = F₁ - F₃

Substituting the values we get:

Fnet = k × (q₁ × q₂) / r₁² - k × (q₃ × q₂) / r₃²

Plugging in the values we get:

Fnet = (8.99 x 10⁹ Nm²/C²) × [(9.33 x 10⁻⁶ C) × (4.22 x 10⁻⁶ C) / (0.180 m)² - (-8.42 x 10⁻⁶ C) × (4.22 x 10⁻⁶ C) / (0.230 m)²]

Fnet = 1.07 x 10⁻² N

Therefore, the net force on q₂ is 1.07 x 10⁻² N, pointing to the left.

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Option C is the use of the equations to arrive at an expression for the electric field produced by a shifting magnetic field.

A current will be induced in a coil of wire if the coil is put in a magnetic field that is changing. Since there is an electric field causing the charges to be forced around the wire, current is flowing as a result. The charges are not initially moving, hence it cannot be the magnetic force.

The moving + and - charges radiate a changing electric field, and it is also visible that this field generates a changing magnetic field as well. With increasing distance from the antenna, the source of the radiation, the electric and magnetic fields lose strength.

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Answer:

a. If the frequency of light is increased above the threshold frequency, the energy of the electrons emitted will increase.

b. If the frequency of light is decreased to below the threshold frequency, the rate at which electrons are emitted will decrease.

c. If the intensity of light is decreased, the energy of the electrons emitted will remain the same, but fewer electrons will be emitted.

d. If the intensity of light is decreased, the rate at which electrons are emitted will decrease.

The formula for potential difference (also known as voltage) is, V = ΔE/q, where V is the potential difference in volts (V), ΔE is the change in electric potential energy in joules (J), and q is the charge in coulombs (C).

Electric potential difference, also known as voltage, is a measure of the electric potential energy per unit of charge required to move a charge from one point to another in an electric circuit. It is the difference in electric potential between two points in an electric circuit.

The formula for potential difference, V = ΔE/q, reflects this relationship. The numerator, ΔE, represents the change in electric potential energy between the two points, while the denominator, q, represents the charge that moves between the two points.

For example, if a charge of +1 C moves from a point A to a point B in an electric circuit, and the electric potential energy at point B is greater than at point A by 1 J, then the potential difference between points A and B is 1 V. This means that it takes 1 J of energy to move a unit of charge from point A to point B in the circuit.

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The speed of the roller coaster car as shown is  31 m/s

We know that the roller coaster is the kind of device that we can use to be able to show the conversion of kinetic energy to potential energy. By the use of the roller coaster, we can show that the total mechanical energy in the system is a constant.

As such we have that;

mgh = 1/2mv^2

m = mass of the object

g = acceleration due to gravity

h = height

v = velocity

Hence;

gh= 1/2v^2

v = √2gh

v = √ 2 * 9.8 * 49

v = 31 m/s

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The weight of the Mars Rover Curiosity on Earth and on Mars is 8820 N and 3330 N respectively.

The weight of an object is given by the product of its mass and the gravitational field strength at its location.

On Earth:

On Mars:

Therefore, the weight of the Mars Rover Curiosity on Earth and on Mars are 8820 N and 3330 N respectively.

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Make sure the exercise program is easy so that you are not challenged is NOT a suggestion for relapse prevention.  The correct option is A

Relapse prevention is a technique used to support people in maintaining long-term behavioral change and stop them from reverting to previous unhealthy practices.

Relapse prevention can take many different forms including :

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Nuclear power plants have backup generators to ensure that essential equipment, such as cooling systems, can continue to function in the event of a power outage or other emergency.

Nuclear power plants rely on a constant supply of electricity to operate the equipment that controls the nuclear reaction and cools the reactor. If the power supply is interrupted, the reactor can overheat and damage can occur. Backup generators provide power to essential equipment, such as cooling systems, that keep the reactor and spent fuel pools from overheating.  If the backup generators fail, there is a risk of a nuclear accident, as was seen in the disaster in 2011, where the failure of backup generators led to a loss of cooling and a major nuclear incident.

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Answer:

1. Visual Impairment: People with visual impairments, including blindness, may find it difficult or impossible to access printed media. This can be due to the small size of text, lack of contrast between the text and background, or other formatting issues that make it difficult to read.

2. Physical Disability: Individuals with physical disabilities that affect their mobility, such as paralysis or tremors, may find it difficult to hold and manipulate printed media, such as books or magazines.

3. Literacy Levels: People who struggle with literacy or have limited reading skills may find it difficult to access printed media. This can be due to the complexity of the language used, or the lack of materials available in their native language.

1. Young's Double Slit Experiment with light proved that light was a wave from a reflection. FALSE

2. Sound waves speed up as they go farther down in the ocean because of multiple factors such as the ocean's waves' wavelengths being longer, pressure increasing, and salinity. TRUE.

The reflection of the light occurs when light hits a hard surface and falls back.

The Young's Double Slit Experiment with light did not prove that light was a wave from a reflection.

For question, 2;  

Sound waves speed up as they go farther down in the ocean because of multiple factors such as the ocean's waves' wavelengths being longer, pressure increasing, and salinity.

The above statement is true, as speed of a wave increases with increase in its wavelength.

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We have to know that the speed is the ratio of the distance to the time and that the speed is a scalar quantity. We are going to apply the concept of the speed here.

The SI unit of speed is meters per second (m/s). Other common units of speed include kilometers per hour (km/h) and miles per hour (mph).

Speed = Distance/Time

Distance = Speed * Time

= 120 seconds * 8.3 m/s

= 996 m/s

The time that is taken so as to travel 3 Km at this speed is

Time = Distance/Speed

Time = 3000 m/996 m/s

= 3 s

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It is not recommended to fire a gun straight up into the air.

When a bullet is fired into the air, it will eventually come down and can pose a danger to people and property below. The bullet can still be lethal when it reaches the ground, especially if it lands on a hard surface or hits someone directly.

Additionally, firing a gun in a residential area can be illegal and can result in legal consequences. In general, guns should only be fired in designated shooting ranges or in self-defense situations where there is an immediate threat to life. It is important to handle firearms responsibly and follow all safety guidelines to prevent accidents and injuries.

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Answer:

Day 0 to day 2: 5km/day

Day 2 to day 3: 2km/day

Explanation:

Day 0 to day 2: 10/2 = 5

Day 2 to day 3: 12 - 10 = 2

To Calculate:

The x-axis, or the days from 0 to 6, line up with the y-axis, or the distance from 0 to 24.  The point in the graph means that on that day, the turtle traveled that much distance.  For example, on the third point (2, 10), the day is 2 and the distance is 10.  To find the distance over multiple days, catalog the days in your mind and look for the points.  Then, find the difference.  For example, from day 2 (2, 10) to day 5 (5, 18), this would look like: 5 - 2 = 3, and 18 - 10 = 8, so this means that over 3 days, the turtle traveled 8 km.

Answer:

Explanation:

Quarter 1 - 10,000 units

Quarter 2 - 12,000 units

Quarter 3 - 16,000 units

Quarter 4 - 14,000 units

Quarter 5 - 10,000 units

Quarter 6 - 8,000 units

Based on this information, the total estimated sales revenue for the next six quarters is Br. 480,000.

The electric potential energy of charge 2q is  2kq/d.

The total electric potential energy of the system is k/d(5q).

The contribution of charge 2q to the electric potential energy of the system is calculated as follows;

U = kq/r²

where;

The electric potential energy of charge 2q is calculated as follows;

U_2q = (k x 2q)/d

where;

Simplify further and we will have;

U_2q = 2kq/d

The total electric potential energy of the system is calculated as;

U_tot = k/d (2q + q - 3q + 5q)

U_tot = k/d(5q)

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Here are two points that establish the importance of Physics:

1. Understanding the natural world: Physics is the branch of science that helps us understand the natural world. By studying the laws of physics, we can understand the behavior of the universe, from the smallest subatomic particles to the largest structures in the cosmos. Physics provides us with a framework for understanding how the world around us works, from the motion of objects to the behavior of light and other forms of energy.

2. Advancing technology and innovation: Physics has been instrumental in advancing technology and driving innovation in many fields. From the development of electricity and electronics to the creation of the internet and advanced materials, physics has provided the fundamental knowledge and tools needed to create many of the technologies that we rely on today. Many of the most important technological advancements of the past century have been based on our understanding of physics, and continued research in this field will likely lead to many more exciting discoveries and innovations in the future.

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Answer:

C) The book's inertia carried it forward.

When the bus stops suddenly, the book tends to remain in motion due to its inertia. The book was at rest on the seat of the bus, and when the bus stopped suddenly, the book continued moving forward with the same speed and direction it had before the bus stopped. As a result, the book slid off the seat and onto the floor.

The student does the same amount of work in both cases, as the displacement and force applied are the same.

The understudy does likewise measure of work in the two cases, ignoring any energy misfortunes because of contact or different elements. This is on the grounds that work is characterized as the result of the power applied and the removal of the item toward the power. In the two cases, the removal of the crate is something similar (the upward separation from ground level to the shipping bay stage) and the power applied by the understudy is the heaviness of the container, which is likewise something similar. Thusly, the work done by the understudy in the two cases is something similar.

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An example of relapse is D, Troy was trying to get stronger, so he participated in a strength training program all year but then got too busy and did not lift a single weight all summer.

After a time of improvement or change, relapse is the return to a prior state or behavior. Relapse is used to describe the restart of drug or alcohol use or other addictive behaviors after a period of abstinence or recovery in the context of addiction or recovery.

This is an example of a relapse "slip" because Troy was making progress towards his goal of getting stronger but temporarily stopped due to being busy, whereas a "fall" would imply a complete abandonment of the goal with no intention of getting back on track.

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Answer: The correct answer is A "Hailey was trying to eat healthier, but she ate a bowl of ice cream after dinner."

Explanation: I got it right on the test

GL to all of you out there <3

The range in pressure differences required to measure the flow rates of 0.002 and 0.02 m^3/s is approximately 2,710.62 Pa.

The pressure difference across a venturi meter is given by the Bernoulli's equation, which states that the sum of the pressure, kinetic energy and potential energy at any two points in a fluid flow system is constant.

Assuming the flow is incompressible and there is no energy loss due to friction or heat transfer, the equation can be expressed as:

[tex]P1 + 1/2 * rho * V1^2 + rho * g * h1 = P2 + 1/2 * rho * V2^2 + rho * g * h2[/tex]

where,

P1 and P2 are the pressures at the inlet and throat of the venturi meter, respectively,

rho is the density of the fluid,

V1 and V2 are the velocities at the inlet and throat,

h1 and h2 are the elevations of the inlet and throat,

and g is the acceleration due to gravity.

Assuming that the elevations of the inlet and throat are the same,

h1 = h2, and the velocity at the inlet is negligible compared to the velocity at the throat, V1 ≈ 0, the Bernoulli's equation simplifies to:

[tex]P1 - P2 = 1/2 * rho * (V2^2 - V1^2)[/tex]

Using the continuity equation, which states that the mass flow rate is constant in a fluid flow system, the velocity at the throat can be calculated as:

[tex]A1 * V1 = A2 * V2[/tex]

where A1 and A2 are the cross-sectional areas of the pipe at the inlet and throat, respectively.

The cross-sectional areas of the pipe and throat are:

[tex]A1 = pi * (15/2)^2 = 176.71 cm^2\\A2 = pi * (5/2)^2 = 19.63 cm^2[/tex]

Using the specific gravity of the oil, we can calculate its density as:

rho = specific gravity * density of water

      = [tex]0.83 * 1000 kg/m^3[/tex]

      = [tex]830 kg/m^3[/tex]

Therefore, the range in pressure differences required to measure the flow rates of 0.002 and 0.02 [tex]m^3/s[/tex] is:

For the maximum flow rate of 0.02 [tex]m^3/s[/tex]:

[tex]V2 = (A1/A2) * V1 \\= (176.71/19.63) * 0.02 / (100/1) \\= 1.8112 m/s\\\\P1 - P2 = 1/2 * rho * (V2^2 - V1^2) \\= 1/2 * 830 * (1.8112^2 - 0) \\= 2,738 Pa[/tex]

For the minimum flow rate of 0.002 [tex]m^3/s[/tex]:

[tex]V2 = (A1/A2) * V1 \\= (176.71/19.63) * 0.002 / (100/1) \\= 0.18112 m/s\\\\P1 - P2 = 1/2 * rho * (V2^2 - V1^2) \\= 1/2 * 830 * (0.18112^2 - 0)\\ = 27.38 Pa[/tex]

Therefore, the range in pressure differences required to measure the flow rates of 0.002 and 0.02 m^3/s is approximately:

[tex]2,738 Pa - 27.38 Pa = 2,710.62 Pa.[/tex]

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If the block is displaced from its equilibrium position by a distance x, the period of its motion is T = 2π/ω = 2π√(m/k).

The period of motion of a block under simple harmonic motion is given as;

T = 2π√(m/k)

Where;

When the block is displaced from its equilibrium position by a distance x,  the force acting on it is given as;

F = -kx

where;

We also know that angular velocity is given as;

ω = √(k/m)

So the equation for the period can also be;

T = 2π/ω = 2π√(m/k)

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Firing a gun straight up into the air can be dangerous because the bullet, when it falls back to Earth, can reach a high enough velocity to cause injury or even death.

When a bullet is fired straight up into the air, it will eventually reach the highest point of its trajectory and begin to fall back down due to gravity. As it falls, it gains speed and momentum, which can cause it to reach a lethal velocity when it impacts a person or object on the ground. This phenomenon is known as "celebratory gunfire," and it can cause serious harm to people who are hit by falling bullets. Therefore, firing a gun straight up into the air is never a safe or responsible act.

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--The complete question is, What is the scientific explanation for why firing a gun straight up into the air can be dangerous, despite the fact that the bullet will eventually fall back down to Earth?--