What is the purpose of the rheostat in this experiment? 1) to limit the current in the circuit. 2) to overheat. 3) as an aid to adjusting the current in the circuit. 4) it is the resistor whose resistance is to going to be determined. Group of answer choices

Answer:

 λ = -47 nC / m  

Explanation:

The missing question is as follows:

" The potential difference between the surface of a 2.2 cm -diameter power line and a point 1.9 m distant is 3.8 kV. What is the magnitude of the line charge density on the power line? Express your answer using two significant figures.  "

Given:

- The Diameter of the power line D = 2.2 cm

- The distance between two ends of power line L = 1.9m

- The potential difference across two ends V = 3.8 KV

Find:

What is the magnitude of the line charge density on the power line?

Solution:

- The derivation of the line of charges for a length L oriented along any axis centered at origin and the potential difference between two ends is as follows:

                                      V = 2*k*λ*Ln( D / L )

Where,

k : Coulomb's Constant = 8.99*10^9

 λ : The line charge density

- Re-arrange and solve for λ:

                                     λ = V / 2*k*Ln( D / L )

Plug in the values:

                                    λ = 3800 / 2*8.99*10^9*Ln( 2.2 / 190 )

                                    λ = -4.74022*10^-8 C / m

                                   λ = -47 nC / m  

Answer:mollusks, echinoderms, chordates, and annelids

Explanation: Cladograms are diagrams made to link different organisms to a common ancestor, with the use of Cladograms the relationship between organisms will be established and organisms will be grouped together based on their common features or characteristics.

Molluscs, Echinoderm,Chordates and annelids are of a common ancestor, they are all invertebrates with COELOM.

Mollusks, echinoderms, chordates, and annelids have a common ancestor.

What is a Cladogram?

This can be defined as diagrams which help to link different organisms to a common ancestor based on common features or characteristics.

The organisms mentioned above are all invertebrates with a Coelom which means they are from a common ancestor.

To develop this problem we will apply the concepts related to the conservation of momentum. For this purpose we will define that the initial moment must be preserved and be equal to the final moment. Since the system was at a stationary moment, the moment before the bullet is fired will be 0, while the moment after the bullet is fired will be equivalent to the sum of the products of the mass and the velocity of each object. , this is,

m_1u_1+m_2u_2 = m_1v_1+m_2v_2

Here,

m = mass of each object

u = Initial velocity of each object

v = Final velocity of each object

Our values are,

\text{Mass of hunter} ) m_1 = 75 kg = 75000 g

\text{Mass of bullet} = m_2 = 42 g

\text{Speed of bullet} = v_2 = 6200 m/s

\text{Recoil speed of hunter} =v_1 = ?

Applying our considerations we have that the above formula would become,

m_1v_1 + m_2v_2 = 0

Solving for speed 1,

v_1 = - \frac{m_2v_2}{m_1 }

v_1 = - \frac{42 * 620}{75000 }

v_1 = - 0.3472 m/s

Therefore  the recoil speed of the hunter is -0.3472m/s, said speed being opposite to the movement of the bullet.

The recoil speed of the hunter standing on the frictionless ice is 0.35m/s².

Given the data in the question;

• Mass of hunter; m_1 = 75kg
• Mass of bullet; m_2 = 42g = 0.042kg
• Velocity of bullet; v_2 = 620m/s

Recoil speed of the hunter; v_1 =\ ?

From the law of conservation of momentum:

MV = mv

Where m is mass and v is velocity

So

m_1v_1 = m_2v_2\\\\v_1 = \frac{m_2v_2}{m_1}

We substitute our given values into the equation

v_1 = \frac{ 0.042kg \ *\ 620m/s^2}{75kg} \\\\v_1 = \frac{26.04kg.m/s^2}{75kg} \\\\v_1 = 0.35m/s^2

Therefore, the recoil speed of the hunter standing on the frictionless ice is 0.35m/s².

Answer:

Framing or leading questions

Explanation:

Research use framing or leading questions to push respondents to provide an answer in the way they are framed. Most of the time, researchers use leading questions with an information they want to confirm rather than to get an unbiased response to the answer. For example, the researcher already knew there was no broken headlight, but framed his question as though there was one. This led to more people claiming they saw a broken headlight.

Leading questions are those that a researcher asks that may lead a respondent to give an answer that is prejudiced or specific. Leading questions are an important aspect of question design or survey to avoid when doing qualitative or quantitative survey research.

The impacts of framing or leading questions are being investigated by the researcher because;

• Leading or framing questions are used in research to encourage respondents to respond in the manner in which they are framed.
• Rather than getting an unbiased response to the question, most researchers utilize leading questions containing information they want to confirm.
• The researcher, for example, knew there was no broken headlight but asked the question as if there was.

As a result, more people reported seeing a broken headlight.