The potential difference across a variable resistor is 11V and the current flowing through it is 0.4A. What is the present resistance of this variable resistor? Give your answer to 1 decimal place.

Answer:

Objective(s): In your own words, what was the purpose of this lab?

The purpose of this lab is to get us familiar with the physical properties of different types of materials that are used for building.

Hypothesis: In this section, include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.

If we use clay brick to build the roof of the house, then the temperature inside the house will remain cooler.

If we use wood to build the walls and floors of the house, then the temperature inside the house will remain cooler.

If we use nickel to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.

If we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.

Procedure: The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome.

Using the summary questions, clearly define the dependent and independent variables of the experiment.

Data: Record the results of each of your physical property tests in the table below.

Wood _  3/10 _0 _0.12 W/(m·K)  _0 S/m _ 4 g/cm3

Clay Brick _ 2/10 _1 _0.6 W/(m·K) _ 0 S/m _ 5.88235 g/cm3

Iron _ 4/10 _10 _80 W/(m·K)  _1x107 S/m  _9.09091 g/cm3

Aluminum_ 7/10 _ 0  _235 W/(m·K) _ 3.8x107 S/m _ 6.66667 g/cm3

Copper _ 6/10 _0 _400 W/(m·K)  _3.8x107 S/m  _9.52381 g/cm3

Nickel _ 5/10 _7 _ 91 W/(m·K)  _1.4x107 S/m  _9.43396 g/cm3

Conclusion: Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.

In this, I investigated the effect that different types of physical properties had on six different materials. I also investigated which materials would be the best to build a house.  

     2. What building material did you use to build your house? Did your results support or fail to support your hypotheses?

For the roof of my house, I used clay bricks. For the walls and floors of the house, I used wood. To bring electricity into the home I used nickel. To construct the latches on the windows and doors, I used iron. My results supported my hypotheses because clay bricks and wood had the lowest thermal conductivity rates, nickel had the second highest electricity conductivity rate, and iron had the highest magnetism rate.    

      3. What were the densities of the materials you chose for the walls and floor for the home in Tiny World? Why do you think a building material's density is important when building homes or architectural structures?

The density of the material I chose for the walls and floors for the home in Tiny World was 4 g/cm3 (Wood). I think a buildings material density is important when building homes or architectural structures because in order for that structure to stay stable the materials that are used must be dense. If the materials are not dense, the structure would most likely collapse if it is placed under too much pressure.

      4. Why wouldn’t you choose wood or aluminum for the latches on your house?

I wouldn’t choose wood or aluminum for the latches on my house because neither of those two materials are magnetic.

    5. Which material has the highest thermal conductivity? Which material has the highest electrical conductivity? Explain why thermal and electrical conductivity is so high with this material.

Copper has the highest thermal conductivity. Aluminum and copper have the highest electrical conductivity. Thermal conductivity is high in copper because copper is a very thin type of material, and this allows heat to pass through it easily. Electric Conductivity is high in both aluminum and copper because they are both a very thin type of metal and because they are both so thin, electricity will pass through them quickly.  

I'm sorry if any of the answers are wrong, this was just assigned to me and my teacher hasn't graded it yet.

The amount of energy from heat saved daily, while providing the same output, would be  0.516 kJ

The thermal efficiency of a heat engine is given by the equation:

Thermal efficiency = (Useful output energy / Input energy) * 100%

In this scenario, the heat engine functions with a thermal efficiency of 70.7 percent and consumes 12.0 kJ from heat daily. We need to calculate the amount of energy from heat that would be saved daily if the thermal efficiency is raised to 75.0 percent.

Let's denote the amount of energy from heat saved as ΔQ.

Using the efficiency equation, we can set up the following equation:

70.7% = (Useful output energy / 12.0 kJ) * 100%

Solving for the useful output energy, we find:

Useful output energy = (70.7/100) * 12.0 kJ = 8.484 kJ

Now, with an increased efficiency of 75.0 percent, we can calculate the new useful output energy:

Useful output energy (new) = (75.0/100) * 12.0 kJ = 9.0 kJ

To determine the amount of energy saved, we subtract the new useful output energy from the original useful output energy:

ΔQ = Useful output energy - Useful output energy (new)

= 8.484 kJ - 9.0 kJ

= -0.516 kJ

The negative sign indicates that the energy is saved, so we take the absolute value:

|ΔQ| = 0.516 kJ

Therefore, the amount of energy from heat saved daily, while providing the same output, would be 0.516 kJ.

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Answer:

the initial velocity is 3.9

Explanation:

v=D/T

h=vi.t-1/2gt²

(18.6-2.4)=vi x 4.7-1/2 x 10 x (4.7)²

16.2=vi x 4.7 - 110.45

vi=26.95 m/s

Answer:

B

Explanation:

Answer:

B

Explanation:

In contrast to other fish, who have bladders filled with gas, sharks have a liver filled with low-density oil that is similar to vegetable oil. This oil is lighter than water and tends to rise to the top of the water if not contained but because it is in the sharks liver its contained therefor the shark floats!

When taxiing a nosewheel equipped high-wing airplane, the most critical wind condition would be a strong crosswind.

High-wing airplanes have their wings positioned above the fuselage, which means that the wing generates lift that can act as a "sail" in crosswinds. When a strong crosswind is blowing perpendicular to the direction of taxiing, it can create a significant lateral force on the wing, making it challenging to maintain directional control.

The criticality of a strong crosswind during taxiing arises from the potential for the wind to push against the side of the high-wing airplane, causing it to weathercock or weathervane. Weathercocking refers to the aircraft's tendency to align itself with the wind, turning the nose into the wind and potentially making it difficult to steer or maintain a straight taxi path.

In extreme cases, a strong crosswind can even lift one wing, causing an imbalance and potentially leading to a loss of control or tipping over on the ground. This situation, known as a wingtip strike, can be dangerous and damaging to the aircraft.

Therefore, pilots of nosewheel equipped high-wing airplanes need to exercise caution and be prepared for strong crosswinds during taxiing. They may need to apply corrective rudder inputs and use appropriate control inputs to counteract the effects of the crosswind and maintain directional control. In some cases, it may be necessary to delay taxiing or seek a more sheltered area if the crosswind becomes too severe to safely maneuver the aircraft on the ground.

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Answer:

In front of the j

Explanation:

Answer:

Point A

Explanation:

Because it reaches maximum height

Answer:

How does increasing the frequency of a wave affect the wavelength of the wave?

The frequency is defined as the number of full wavelengths that may be completed in a given unit of time (f). The frequency (F) and energy (E) of a wavelength drop as the wavelength's size rises. As a result of these calculations, you may have noticed that the wavelength grows shorter as the frequency rises. The wavelength increases in length in proportion to the reduction in frequency.

Explanation:

How does increasing the wavelength of a wave affect the frequency of a wave?

The frequency (F) and energy (E) of a wavelength drop as the wavelength's size rises. As a result of these calculations, you may have noticed that the wavelength grows shorter as the frequency rises. The wavelength increases in length in proportion to the reduction in frequency.

Answer:

This isnt exactly an answer, but it should help if you need a general grip on the subject. Its simply an example or model.

Explanation:

It is sort of like being on the road. If you want to get to your destination, you have to follow the correct path or paths, meaning you dont want to steer out of lane because if you do it will be even harder to get where you were going. So as long as you can get a general direction of the frequency you can narrow it down you can find where you are going.

Answer: C. 20.25J

Explanation: KE = 1/2 m v^2

m= .005, v= 90

1/2 * .005 * 90^2 =  20.25J

The astronaut's final speed with respect to the shuttle after the tank is thrown would be 2.67 m/s.

Let's first find the initial momentum of the system, which is zero because the astronaut is at rest with respect to the shuttle and the tank is thrown in the opposite direction with a speed of 12 m/s:

p_initial = m_astronaut * v_astronaut_initial + m_tank * v_tank_initial

where m_astronaut = 63 kg is the mass of the astronaut, v_astronaut_initial = 0 m/s is the initial velocity of the astronaut, m_tank = 10 kg is the mass of the oxygen tank, and v_tank_initial = -12 m/s is the initial velocity of the tank (negative because it is thrown in the opposite direction).

p_initial = 63 kg * 0 m/s + 10 kg * (-12 m/s) = -120 kg m/s

After the tank is thrown, the system experiences no external forces, so its total momentum remains constant:

p_final = m_astronaut * v_astronaut_final + m_tank * v_tank_final

Since the tank is thrown away from the astronaut with a certain momentum, the astronaut gains an equal and opposite momentum, so we can write:

p_final = -p_initial

Substituting the values of p_final and p_initial, we get:

m_astronaut * v_astronaut_final + m_tank * v_tank_final = -120 kg m/s

We also know that the tank is thrown away at a certain speed, so we can write:

v_tank_final = -12 m/s

Thus:

m_astronaut * v_astronaut_final + 10 kg * (-12 m/s) = -120 kg m/s

v_astronaut_final = (120 kg m/s - 10 kg * (-12 m/s)) / 63 kg

v_astronaut_final = 2.67 m/s

Therefore, the astronaut's final speed with respect to the shuttle after the tank is thrown is 2.67 m/s.

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Complete question:

A 50,000 kg train car moving at 2 m/s collides and connects to another identical car initially at rest. Find the velocity of the two cars immediately after collision.

Answer:

The final velocity of the two cars after collision is 1 m/s.

Explanation:

Given;

mass of first car, m₁ = 50,000 kg

mass of the second car, m₂ = 50,000 kg  (identical to first car)

initial velocity of the first car, u₁ = 2 m/s

initial velocity of the second car, u₂ = 0

let the final velocity of the two cars after collision = v

The final velocity of the two cars can be calculated from law of conservation of linear momentum for inelastic collision.

m₁u₁ + m₂u₂ = v(m₁ + m₂)

50,000 x 2    + 50,000 x 0 = v(50,000 + 50,000)

100,000 = 100,000v

v = 100,000 / 100,000

v = 1 m/s

Therefore, the final velocity of the two cars after collision is 1 m/s.

Answer:

40 m

Explanation:

The area under v-t graph gives the distance travelled by the particle.

Distance = area of ΔOBC + area of ΔCDE + area of ΔEFG

\(=\dfrac{1}{2}\times 4\times 10+\dfrac{1}{2}\times 2\times 10+\dfrac{1}{2}\times 4\times 5\\\\=40\ m\)

So, the distance travelled by the particle in the time interval t = 0 and t= 10 s is equal to 40 m.

Momentum is never created or destroyed. It is conserved.

The cue stick gave the cue ball all the momentum there is on the table.  There's nothing on the table that can pour in any more momentum.

After the strike, with 15 or 16 balls rolling every which way around the table, the total momentum of all of them combined will be the same as the cue ball's momentum right now, before the strike.

Both the balls hit the ground at the same time.

A body is said to be in freefall when it only moves in relation to the Earth's gravity. An external force exerted on the ball will cause its motion to accelerate. Gravitational acceleration is another name for this rate of free fall.

Due to the fact that the horizontally thrown ball's vertical motion is fully independent of its horizontal motion, both will strike the ground at the same time. As a result, both balls appear to be dropped and descending vertically at the same time in terms of vertical motion.

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Compensation may be provided, and a temporary residence provided, to the family so that they may make necessary adjustments to their living arrangements and other work-related matters. Even if it's not the nicest way to go about things, it's the most effective.

Generally, Money given to a successful plaintiff in civil litigation is known as "compensatory damages." Damage awards are handed out by the civil justice system.

In conclusion, Engineers have a responsibility to find optimal solutions that satisfy the demands of the public in a manner that is both practical and beneficial to the progress of the country as a whole. In this case, forcing the farm family to relocate would be very difficult and upsetting for them, but it would be quite useful for the community as a whole if a road were to be constructed.

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The correct answer is option is  B. Auger. Because  an auger drill rig is specifically designed for drilling in soft soils. It uses a large rotating drill bit with a helical screw-like design to remove soil from the hole it is drilling.

Also, It is a popular choice for environmental and geotechnical drilling projects, as it can drill quickly and efficiently through soft, saturated soils.. Auger drills are available in a variety of sizes and configurations, and can be used with different drilling techniques, including direct push, rotary, and sonic drilling. Hence, the correct answer is option : B.

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If 1 kg ball is held motionless above the ground and then released. At impact, it was traveling at 5.50 m/s. The amount of the potential energy  it have before it was released is: D. 15.1 J.

Potential energy is related to the height of an object and can be calculated using the equation:

PE = mgh

where :

m = mass of the object

g =  acceleration due to gravity (9.8 m/s^2)

h = height above the ground

Since the initial velocity of the ball is zero, the potential energy can be calculated as follows:

PE = 0.5 * m * v^2

where:
m = mass of the ball (1 kg)

v =  velocity at impact (5.50 m/s)

PE = 0.5 * 1 kg * (5.50 m/s)^2 = 15.1J

Therefore the ball had 15.1 J of potential energy before it was released.

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Answer:

D. All of the above

Explanation:

Because it's the most logical answer.

While designing a circuit that has two resistors connected in series. Given that we have a 20 V battery that will produce a current of 0.2 A their equivalent resistance in series must be 100 Ohm.

Resistance is the obstruction of electrons in an electrically conducting material.

The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.

V=IR

For calculating equivalent resistance in series combination.

Re = R1  + R2

For the given problem we have to design and construct a circuit that has two resistors connected in series.

Given that we have a 20 V battery, that will produce a current of 0.2 A

By using Ohm's law.

V=IR

As voltage V is given 20.0 V and current I = 0.2 A

20=0.2R

R=100 Ohm

The equivalent resistance of the circuit should be 100 Ohm

For   equivalent resistance in series

Re = R1 +R2

100 =R1 + R2

Thus, the resistor can be in various combinations but the sum of their equivalent value must be 100

For example it can either be 50 Ohm, and 50 ohm or 60 ohm and 40 ohm

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At the solenoid's core, there is no net magnetic field. This is due to the fact that the magnetic field within each solenoid is constant and oriented along the solenoid's axis.

1. The smaller solenoid at the center of the bigger solenoid will produce a magnetic field that is in one direction, while the larger solenoid will produce a magnetic field that is in the opposite direction.

2. The aforementioned reasoning is predicated on the fact that a solenoid's magnetic field is homogenous and directed along its axis. This is because the magnetic fields produced by each turn of the wire in the solenoid add up because they all produce a magnetic field facing the same way.

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Correct Question:

Two solenoids haven windings per meter and current. One solenoid has a diameter D and the other has a diameter of d- D/2. The direction of the current in each solenoid is shown in the figure. 1) The small solenoid is placed inside the large solenoid so that its long axes lie together. What is the magnetic field at the center of the solenoids? The net magnetic field is the positive Net magnetic field is negative. The net magnetic field is zero

The gravitational force of Earth on the satellite, given that the satellite is launched into orbit 30000 km above sea level is 1.63×10³ N

The gravitaional force between two objects can be obtained by using the following formula:

F = GM₁M₂ / r²

Where

The following data were obtained from he question:

The gravitaional force can be obtained as shown below:

F = GM₁M₂ / r²

F = (6.673×10¯¹¹ × 5.4×10³ × 6.0×10²⁴) / (36400000)²

F = 1.63×10³ N

Thus, the gravitational force is 1.63×10³ N

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False. The Hertzsprung-Russell (HR) diagram does not display the apparent magnitude of stars.

The HR diagram is a plot that illustrates the relationship between the absolute magnitude (luminosity) and the spectral type or surface temperature of stars. The vertical axis represents the absolute magnitude, which is a measure of a star's intrinsic brightness or luminosity. The horizontal axis represents the spectral type or surface temperature, usually indicated by the stellar color or spectral class. The HR diagram helps astronomers classify stars and understand their evolutionary stages.

Apparent magnitude, on the other hand, refers to how bright a star appears to an observer on Earth. It takes into account the star's intrinsic luminosity as well as its distance from Earth. While the apparent magnitude is an important parameter for studying stars, it is not directly represented on the HR diagram. Instead, the HR diagram provides information about a star's luminosity and temperature, enabling scientists to study stellar properties, evolutionary stages, and relationships between different types of stars.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

The buoyant force is the force exerted on an object by a fluid that opposes the weight of the object. The buoyant force is equal to the weight of the fluid displaced by the object.

Therefore, if an object is floating, the buoyant force must be equal to the weight of the object. An object weighing 50 N is floating in a fluid. This means that the buoyant force is 50 N. The above statement is because when the object is floating in the fluid, the weight of the object is equal to the buoyant force. Therefore, the object will neither sink nor rise, but rather float at the same position in the fluid.

Hence, the buoyant force of the fluid on the object is 50 N. An object will float in a fluid if the weight of the object is less than or equal to the buoyant force. However, if the weight of the object is more than the buoyant force, the object will sink.

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Answer:

D. volume

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

A book on a table before it falls.

A yoyo before it is released.

A raised weight.

Explanation:

These are all examples of potential energy. So I hope you can find something that is comparable from the lab.