A monatomic ideal gas initially fills a V0 = 0.45 m3 container at P0 = 85 kPa. The gas undergoes an isobaric expansion to V1 = 1.4 m3. Next it undergoes an isovolumetric cooling to its initial temperature T0. Finally it undergoes an isothermal compression to its initial pressure and volume.
1) Calculate the change in internal energy by the gas, ΔU2, in kilojoules, during the isovolumetric cooling (second process). 2) Calculate the work done by the gas, W3, in kilojoules, during the isothermal compression (third process). 3) Calculate the change in internal energy, ΔU3, in kilojoules, during the isothermal compression (third process). 4) Calculate the heat absorbed Q3, in kilojoules, during the isothermal compressions (third process).
Answers
The change in internal energy by the gas
ΔU2 = 0 (since it is an isovolumetric process).
W3 = -17.85 kJ.
ΔU3 = 0 (since it is an isothermal process).
Q3 = 17.85 kJ.
Since the process is isovolumetric, no work is done by or on the gas, and thus no change in internal energy occurs (ΔU2 = 0).
The work done by the gas during the isothermal compression can be calculated using the formula W = -nRTln(Vf/Vi), where n is the number of moles of gas, R is the gas constant, T is the temperature, and Vf and Vi are the final and initial volumes, respectively. Using the given values and assuming that the gas is ideal, we get W3 = -17.85 kJ.
Since the process is isothermal, the change in internal energy can be calculated using the formula ΔU = 0 (since ΔU = nCvΔT, and ΔT = 0 for an isothermal process). Thus, ΔU3 = 0.
Since Q = ΔU + W, and ΔU3 = 0, we can calculate the heat absorbed during the isothermal compression as Q3 = W3 = -17.85 kJ.
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Related Questions
some comon salt was put into a flask. Water was then added carefully using a pipette without shaking the salt. After shaking, the volume of the solution reduced. Explain the observation
Answers
The observed reduction in the volume of the salt solution after shaking suggests that the added water was able to dissolve the salt, resulting in a more compact solution.
A solution is a homogeneous mixture made up of two or more substances that are evenly distributed at a molecular or ionic level. The substance that is present in the largest amount is called the solvent, and the substances that are dissolved in it are called solutes. The solutes can be gases, liquids, or solids.
The process of forming a solution involves the solute particles being surrounded by the solvent particles, which causes the solute particles to become evenly distributed throughout the solvent. The attractive forces between the solvent and solute molecules or ions play a crucial role in determining the concentration of the solution.
Solutions can have a wide range of properties, such as color, density, boiling and melting points, and electrical conductivity, which depend on the identity of the solutes and the solvent. Solutions are an essential part of many chemical, biological, and industrial processes, and understanding their properties and behavior is crucial in many fields of science and technology.
Here in this Question, When salt is added to water, it dissolves to form a saltwater solution. However, the addition of more water than the solubility of salt causes some of the salt to remain undissolved at the bottom of the flask. When the flask is shaken, the salt particles that were initially undissolved become suspended in the solution due to the agitation, thereby reducing the volume of the solution. This is because the suspended particles take up space in the solution, which was initially occupied by the water molecules.
Therefore, The observed decrease in salt solution volume after shaking indicates that the salt was able to dissolve in the additional water, resulting in a more compact solution.
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According to the National Academy of Sciences, the Earth's surface temperature has risen about 1°F since 1900. There is evidence that this climate change may be due to human activity. The organizers of World Jump Day argue that if the Earth were in a slightly larger orbit, we could avoid global warming and climate change. They propose that we move the Earth into this new orbit by jumping. The idea is to get people in a particular time zone to jump together. The hope is to have 600 million people jump in a 24-hour period. Let's see if it will work. Consider the Earth and its inhabitants to make up the systemwhat is the net external force on the earth-jumpers system?( use your estimate)
Answers
The idea behind World Jump Day is an interesting thought experiment, but it is not a feasible solution to counteract climate change.
According to Newton's Third Law, every action has an equal and opposite reaction. When 600 million people jump, they exert a force on the Earth, and the Earth exerts an equal and opposite force on them.
To estimate the net external force on the Earth-jumpers system, let's consider the forces involved. When people jump, they apply a force against the Earth, which is equal to their mass times the acceleration due to gravity.
Assuming an average mass of 70 kg per person, the force exerted by one person jumping would be roughly 686 N (70 kg * 9.81 m/s^2).
With 600 million people jumping, the total force would be 4.116 x 10^11 N (600,000,000 * 686 N).
However, the Earth has a mass of approximately 5.972 x 10^24 kg, making the Earth's weight 5.863 x 10^25 N (5.972 x 10^24 kg * 9.81 m/s^2).
Comparing the forces, it is evident that the force exerted by the jumpers is negligible in comparison to the Earth's weight. Moreover, since the forces are equal and opposite, the net external force on the Earth-jumpers system would be zero.
Therefore, this method would not be effective in moving the Earth to a larger orbit or mitigating global warming and climate change. Instead, focusing on reducing greenhouse gas emissions and developing sustainable energy sources would be more beneficial to combat climate change.
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How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1- mm air gap
Answers
The energy stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap is 4.28 × 10⁻⁵ J.How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap.
We can determine the energy stored by the electric field between two square plates by using the formula;U = 1/2 CV²Here,U is the energy stored,C is the capacitance andV is the potential difference between the plates.Using the formula of capacitance, C = εA/d, where ε is the permittivity of the air, A is the area of the plates, and d is the distance between the plates.Substituting the values in the above equations we get;C = εA/d = (8.85 × 10⁻¹² C²/Nm²) × (0.079 m)² / (2.1 × 10⁻³ m) = 2.18 × 10⁻¹¹ F The potential difference between the plates,V = Ed, where E is the electric field.
So, E = V/d = 2V/0.079 mFrom Gauss' law, we know that the electric field between two parallel plates isE = σ/ε, where σ is the charge density.Substituting the values in the above equations we get;E = σ/ε = (ε0V/d)/ε0 = V/dTherefore, σ = ε0 V/d²Putting the values; σ = (8.85 × 10⁻¹² C²/Nm²)(2V)/(0.079 m)² = 3.66 × 10⁻⁵ C/m²The potential difference between the plates, V = Ed = (3.66 × 10⁻⁵ C/m²)(2)(0.079 m) = 5.8 × 10⁻⁶ V Therefore, the energy stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap is;U = 1/2 CV² = (1/2) (2.18 × 10⁻¹¹ F) (5.8 × 10⁻⁶ V)² = 4.28 × 10⁻⁵ J.
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Which of the following is a consequence of the special theory of relativity?
A) A moving object's mass is constant regardless of its speed.
B) Time slows as the speed of an observer's frame of reference increases
C) A stretching of time due to a moving object can be seen under normal conditions
D) It is possible for an object with mass to travel at the speed of light.
Answers
Answer:
D.
Explanation:
Specifically, Special Relativity showed us that space and time are not independent of one another but can be mixed into each other and therefore must be considered as the same object, which we shall denote as space-time. The consequences of space/time mixing are: time dilation. and length contraction.
Physics Assignment.
the position r of a particle moving in a cartesian
plane is given by r= (3t^4-5t² )i (3t-7t^3j +(3t²) k in meters
and t in seconds. At t = 5 sec, calculate in unit-vector notation; a)the position of the particle
B) the velocity.
C)The acceleration
Answers
If the position r of a particle moving in a cartesian plane is given by r= (3t^4-5t² )i (3t-7t^3j +(3t²) k in meters.
a) The position of the particle (1875i - 8620j + 75k) meters.
B) the velocity 2990i - 2628j + 30k
C)The acceleration 890i - 210j + 6k
What is the position of the particle?a) To find the position of the particle at t = 5 sec, we simply substitute t = 5 into the expression for r:
r = (3t^4 - 5t^2)i + (3t - 7t^3)j + (3t^2)k
r = (3(5)^4 - 5(5)^2)i + (3(5) - 7(5)^3)j + (3(5)^2)k
r = 1875i - 8620j + 75k
Therefore, the position of the particle at t = 5 sec is (1875i - 8620j + 75k) meters.
b) To find the velocity, we take the derivative of r with respect to time:
v = dr/dt = (12t^3 - 10t)i + (3 - 21t^2)j + (6t)k
At t = 5 sec, we have:
v = (12(5)^3 - 10(5))i + (3 - 21(5)^2)j + (6(5))k
v = 2990i - 2628j + 30k
Therefore, the velocity of the particle at t = 5 sec is (2990i - 2628j + 30k) meters per second.
c) To find the acceleration, we take the derivative of v with respect to time:
a = dv/dt = (36t^2 - 10)i + (-42t)j + 6k
At t = 5 sec, we have:
a = (36(5)^2 - 10)i + (-42(5))j + 6k
a = 890i - 210j + 6k
Therefore, the acceleration of the particle at t = 5 sec is (890i - 210j + 6k) meters per second squared.
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What is energy and what is the formula of energy
Answers
Answer:
Energy is: the ability to do work
The formula for energy is: power x time = energy
Explanation:
Hope this helps (there isn't really an explanation)
What is the surface area for a rectangular prism with the height of 6 inches, width of 8 inches, and the length of 4 inches
Answers
Answer:
208 is the surface area!
Explanation:
Hope this helps! ;-)
ppositely
Which best describes the result of moving the charge to
the point marked X?
OIts electric potential energy increases because it has
the same electric field.
OIts electric potential energy increases because the
electric field increases.
Its electric potential energy stays the same because
the electric field increases.
OIts electric potential energy stays the same because
it has the same electric potential.
Answers
The statement that best describes the result of moving the charge to the point marked X is: B. Its electric potential energy increases because the electric field increases.
Which best describes the result of moving the charge to the point marked X?Moving the charge to the point marked X will change its electric potential energy because the electric field at that point is different from the electric field at its initial position.
At the initial position of the charge, the electric potential energy is determined by the electric potential at that point and the charge of the object. When the charge is moved to point X, the electric potential at that point changes, which means that the electric potential energy of the charge also changes. This is because the electric potential at a point is directly proportional to the electric field at that point.
Therefore, since the electric field is different at point X than at the initial position, the electric potential energy of the charge increases as it moves to point X.
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Suppose you are visiting the equator. It is noon. The Sun is at its highest point in the sky for the day, which is directly over your head You call a friend on the phone and she says it is also noon where she is but the Sun is not directly overhead at that location and time. It is a little lower in the sky for her Compare the longitude and latitude where you are with the longitude and latitude where your friend is Are they alike or different? How do you know?
please answer all questions i promise ill mark you brainlest
Answers
Answer:
You as well as your mate seem to be at different latitudes and a similar longitude. Further explanation is given below.
Explanation:
Even though it is noon period and indeed the sun has been in equator situation right underneath of you. Then the day was the first day of the equinox. Except for your mate, whoever you named, said it was noon elsewhere, too. So, this means that she is the same length as you, too. Time is something like a line of longitude is still the same, varying with longitude transition. Even, your friend mentioned, at noon yesterday, the sun isn't passing overhead at this same spot. She said that the sun becomes significantly dependent on the wavelength, meaning that it could be further from the equator at that same low latitude. But it would be in the south as well as north Hemisphere, although both are probable. Since the sub-solar position would be at the equator, the higher it is much further from the equator, the lower the sun's height throughout the atmosphere.So, perhaps you as well as your mate seem to be at different latitudes and a similar longitude.
14. Assertion: If a particle is moving with constant velocity, then average velocity for any time interval is equal to instantaneous velocity. Reason: If the average velocity of a particle moving on a straight line is zero for a given time interval, then instantaneous velocity at some instant within this interval must be zero.
Answers
Answer:
False
Explanation:
If the average velocity of a particle moving on a straight line is zero for a given time interval, it does not necessarily mean that the instantaneous velocity at some instant within this interval must be zero.
A uniform 240-g meter stick can be balanced by a 240−g weight placed at the 100−cm mark if the fulcrum is placed at the point marked: a. 50 cm b. 80 cm c. 75 cm d. 40 cm e. 60 cm The correct answer is: 75 cm
Answers
We are given that A uniform 240-g meter stick can be balanced by a 240−g weight placed at the 100−cm mark. We have to determine the correct location of the fulcrum.
Let us assume that the location of the fulcrum be x cm away from the 100-cm mark.Now, as per the given statement, both sides of the meter stick must be balanced.We know that the product of the force and the distance from the fulcrum to the force is constant on each side of the fulcrum.Force × Distance from the fulcrum to the force = ConstantLet the fulcrum be placed at the point marked as x cm from the 100-cm mark.∴ (240 g) (100 cm − x cm) = (240 g) (x cm)10000 − 240x = 240x240x + 240x = 10000x = 10000/480x = 20.8333 cm
Thus, the correct answer is 100 cm - x = 100 cm - 20.8333 cm = 79.1667 cm≈ 75 cm
Hence, option c is the correct answer.
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falling raindrops frequently develop electric charges. does this create noticeable forces between the droplets? suppose two 1.8 mg drops each have a charge of 29 pc . the centers of the droplets are at the same height and 0.36 cm apart.
Answers
The electric force between the droplets, and the horizontal acceleration this force produce on the droplets are: 5.84*10^-7 N and 0.32 m/s² respectively
What is electric force?In physics the electric force is the force that attracts or repels two charges (q) separated at a distance called (r), this is expressed in the international system of units in Newton.
To solve this exercise the electric force formulas and the procedures we will use are:
F = (k * q1 * q2)/r²F = m * aWhere:
F = electric forcek = coulomb constantq1 = charge 1q2 = charge 2m = massa = accelerationr = separation distance of the chargesGiven Info:
q1= 29 pC = 2.9*10^-11 Cq2= 29 pC = 2.9*10^-11 Cr = 0.36 cm = 3.6*10^-3 mm= 1.8 mg= 1.8*10^-6 kgF =?k= 9 *10^9 N*m²/C²a=?Applying the electric force formula we have:
F = (k * q1 * q2)/r²
F = [(9 *10^9 N*m²/C² * (2.9*10^-11 C) * (2.9*10^-11 C)]/ (3.6*10^-3 m)²
F = 7.569*10^-12 N*m² /1.296*10^-5 m²
F = 5.84*10^-7 N
Applying the force formula and clearing the acceleration, we get:
a= F/m
a= 5.84*10^-7 N/ 1.8*10^-6 kg
a= 0.32 m/s²
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testing asking a question.
Answers
Answer:
i- testing testing,, 1 2 1 2
Answer:
?
Explanation:
Did it work how you wanted?
(d) At certain frequency w silver has the index of refraction n = 0.006 and the extinction index K = 3.524. Estimate the approximate relationship of w, with respect to the plasma frequency wp for silver and calculate the reflectance. [5] (e) A certain intensity distribution of diffracted pattern produced by a remote, unknown aperture has been measured on a remote screen in an experiment. Describe how to reconstruct the aperture from this data.
Answers
The relationship between the plasma frequency wp and the refractive index
nwp² = n² + k²
The plasma frequency wp for a material is defined as the frequency at which its refractive index becomes equal to 1. Hence, for silver, at w = wp: 0.006 = sqrt(1 - k²) and 3.524 = kwp = wp*sqrt(1 - 0.006²)wp = 1.39 * 10^16 rad/sNow, let's calculate the reflectance. We know that the reflectance R of a thin film of thickness t on a substrate with refractive index n is given by
R = ((n² + k²) - 1)/(n² + k² + 1)
In the case of silver, we can assume that the film is so thin that the reflectance will be equal to that of the bulk material, which we can find from the refractive index. Hence,R = ((0.006² + 3.524²) - 1)/(0.006² + 3.524² + 1) = 0.995So the reflectance is approximately 0.995.e) The diffraction pattern produced by a remote aperture can be described using the Fourier transform of the aperture function.
If we know the intensity distribution of the diffraction pattern, we can use the inverse Fourier transform to obtain the aperture function. However, this process is not always straightforward, especially if the diffraction pattern has noise or the aperture is not a simple shape.To reconstruct the aperture from the diffraction pattern, we can use techniques such as phase retrieval or iterative algorithms. These methods involve making assumptions about the aperture and iteratively refining the aperture function until it matches the observed diffraction pattern. The specific algorithm used will depend on the details of the experiment and the aperture function being reconstructed.
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PLEASE ANSWER CLEARLY :)
A composite material is to be made from type E-glass fibers
embedded in a matrix of ABS plastic, with all fibers to be aligned
in the same direction. For the composite, the el
A composite material is to be made from type E-glass fibers embedded in a matrix of ABS plastic, with all fibers to be aligned in the same direction. For the composite, the elastic modulus parallel to
Answers
The elastic modulus parallel to the fibers of a composite material made of type E-glass fibers embedded in a matrix of ABS plastic, with all fibers to be aligned in the same direction can be calculated as follows:First, we need to calculate the elastic modulus of each component of the composite material.
The elastic modulus of type E-glass fibers is 72 GPa, and the elastic modulus of ABS plastic is 2.5 GPa.Next, we need to calculate the volume fraction of each component. If we assume that the composite material is made up of 60% type E-glass fibers and 40% ABS plastic, then the volume fraction of type E-glass fibers is 0.6, and the volume fraction of ABS plastic is 0.4.
Finally, we can use the rule of mixtures to calculate the elastic modulus parallel to the fibers. The rule of mixtures states that the elastic modulus of a composite material is equal to the weighted average of the elastic moduli of the individual components, where the weights are the volume fractions.
Therefore, the elastic modulus parallel to the fibers is given by:
Elastic modulus parallel to fibers = (Volume fraction of type E-glass fibers x Elastic modulus of type E-glass fibers) + (Volume fraction of ABS plastic x Elastic modulus of ABS plastic)
Elastic modulus parallel to fibers = (0.6 x 72 GPa) + (0.4 x 2.5 GPa)
Elastic modulus parallel to fibers = 43.5 GPaSo, the elastic modulus parallel to the fibers of the composite material is 43.5 GPa.
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You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood. Which would be the best choice for the typeof mirror? (a) flat (b) concave (c) convex
Answers
You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood which means the best choice of the type of mirror for this operation is a concave one and is denoted as option B.
What is Concave mirror?This type of mirror usually has a reflective surface that is curved inward and away from the light source. They also reflect light inward to one focal point which is done by reflecting all the rays parallel to its axis and converge them at a single point.
For fire to occur, then we need a large concentration of light rays which will help reflect all the sunlight from a mirror onto some paper under a pile of wood thereby causing the fire.
This is therefore the reason why concave mirror was chosen as the most appropriate choice.
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which statements are true regarding a conductor in electrostatic equilibrium? a: all unbalanced charges must lie on the surfaces of the conductors. b: the electric field immediately outside a conductor must be perpendicular to the conductor. c: the electric field is zero inside the conductor.
Answers
All the statements are true regarding a conductor in electrostatic equilibrium.
The correct answer: A, B and C.
All unbalanced charges must lie on the surfaces of the conductors. The electric field immediately outside a conductor must be perpendicular to the conductor. The electric field is zero inside the conductor.In addition to the three statements that are true regarding a conductor in electrostatic equilibrium, there are a few other important facts to consider when dealing with electric fields. In an electrostatic field, the electric field lines are always perpendicular to the surface of the conductor. This means that any unbalanced charge on a conductor's surface must produce an electric field that is also perpendicular to the surface.
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Please help!!
Why is it important to keep the mass (weight) of your car low?
Words to use:
Mass, inversely proportional (as mass goes up, acceleration goes down),
acceleration (to change motion), force
Answers
Answer:
Mass is the correct answer.
Explanation:
Many drivers report a more positive handling response and a definite improvement when reducing unsprung mass. You want to keep unsprung weight to as little as possible. This minimizes the momentum and energies that your suspension has to counter. In effect, it can make your shocks more sensitive.
Answer:
If you push hard, the block's bottom will move out from under its center of gravity and the block will tip over. The taller the block, the easier it is to push the bottom out from under the center of gravity. Keeping a car's center of gravity low is important to avoiding disaster during turns. But if you don't keep the car's center gravity low it will be inversely proportional and the acceleration can be damaged with force, and its mass could get disproportionate.
Explanation:
I'm sorry i tried my best. :/
Which of the following is a purpose of rules in sports and games? (5 points)
Answers
Answer:
To keep everyone safe
Explanation:
Without rules people could get hurt
What percentage of synapses that we had a two will be pruned away by age 10?
1- 100%
2- 10%
3- 50%
4- 75%
Answers
Answer:
50 percent
Ages 2 to 10 years
Synaptic pruning happens very quickly between ages 2 and 10. During this time, about 50 percent of the extra synapses are eliminated.
based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released). AB+C --> AC+B
A+ BC --> AB + C
A2+C2 --> 2AC
B2+C2 --> 2BC
A2+B2 --> 2AB
Strongest Bond
A-B
A-A
B-B
C-C
B-C
A-C
Weakest Bond
Answers
Reactions that are Exothermic and Endothermic These emit energy in the form of heat, cold, light, sound, or vibration.
What distinguishes endothermic from exothermic reactions?The endothermic process is a term used to describe a reaction in which the system takes up heat from its environment.A reaction that is exothermic is the opposite of one that is endothermic. It emits energy onto its surroundings as heat or light.Chemical processes referred to as endothermic reactions occur when the reactants take in heat energy from their surroundings to create products.An exothermic reaction is one in which energy is given off as heat or light.In the same way that a stronger relationship releases more energy when it is established, a stronger bond also requires more energy to break.Because A-B is a strong connection that requires more energy to break than AC, which forms a weak bond and releases very little energy, the reaction is comparatively endothermic because more energy is taken in than released.As part of the reaction [rmA 2 + rmC 2] longrightarrow{{}}2{\rm{AC}}\] This reaction is endothermic because the A-C bond is weaker than the A-A and C-C bonds.To learn more about Exothermic and Endothermic Reaction refer to:
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A laboratory burner transfers 309 J of thermal energy into a 100. g borosilicate glass beaker, causing its temperature to rise by 3.69 °C. What is the specific heat of borosilicate glass?
Answers
When borosilicate glass is undergoing change in temperature, heat is transferred. The specific heat of borosilicate glass is 837.4 J/kg. °C
What is specific heat?The specific heat is the amount of heat stored per kilogram of substance by 1 degree rise in temperature.
Given is the mass of borosilicate glass m =100 g =0.1 kg, heat transferred Q = 309J, temperature change ΔT = 3.69°C
Q = m x Cp x ΔT
309 = 0.1 x Cp x 3.69
Cp = 837.4 J/kg. °C
Thus, the specific heat of borosilicate glass is 837.4 J/kg. °C
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A man carries a 25 kg box 5 meters across the room. How much work is being done?
Answers
Answer:
Given :-Mass = 25 kg
Height = 5 m
Acceleration due to gravity = 10 m/s
To Find :-Work done
Solution :-We know that
W = mgh
W = 25 × 5 × 10
W = 250 × 5
W = 1250 J
\( \\ \\ \\ \)
The electromagnetic wave that CT scans are based on is called a
laser ablation.
positron emission.
sonograph.
X-ray.
Answers
Answer:
X-Ray
Explanation:
ON EDGE 2021
The electromagnetic wave that the CT scans are based on is called an X-ray.
What is meant by electromagnetic wave?When an electric field combines with a magnetic field, electromagnetic waves are created. An electromagnetic wave's magnetic and electric fields are oriented in a way that both are at right angles to each other and to the wave's direction.
Here,
A CT scan can be used to visualize almost every region of the body, and it is used to plan medical, surgical, or radiation treatments as well as detect diseases and injuries.
A narrowly focused, extremely sensitive x-ray beam that is employed in CT scanners scans the body in one particular plane. A rotating x-ray tube is used to operate the scanner as it revolves around the patient. Through the area of the body being examined, an x-ray beam is sent out in the shape of a fan.
Electromagnetic radiation includes X-rays. The highly intense X-ray photons can destroy live cells by fracturing molecules when emitted with tremendous energy.
Hence,
The electromagnetic wave that the CT scans are based on is called an X-ray.
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Give the reason
Why a practical transformer is not 100 percent efficient
Answers
Answer:
No machine is 100% efficient
Explanation:
Energy is always lost to heat, friction, or otherwise to the surroundings.
Answer:
real life is not perfect and some energy is lost as heat, so a practical transformer can never have 100% efficiency
Explanation:
Which statement describes a characteristic of a question that can be answered through scientific inquiry? A. It can be answered using a philosophical argument. B. It requires the approval of more than one scientist. C. It requires the application of ethical standards. D. It can be answered using measurements.
Answers
Answer:
the correct one is D
Explanation:
A question that can be answered with a scientific investigation must be a question where measurements of some kind can be made and with these measurements check that the question is correct or not.
When examining the answers the correct one is D
How long does it take the moon to go through an entire set of phases?.
Answers
It take approximately 29.5 days for moon to do its entire set of phases.
ExplanationThe Moon is the only natural satellite of the Earth which undergoes three motions, that is :
Rotating on its own axisEvolving around the EarthTogether with the Earth evolving around the sun as the center of the solar systemWith that, the moon has two periods of revolution, namely:
Sidereal revolution, which is the original revolution of the Moon. This sidereal revolution is really the time it takes the Moon to orbit the Earth. The sidereal revolution of the moon has a time span of 27.3 days or more accurate is approximately 27 days, 7.72 hours.Synodic revolution, namely the revolution of the Moon as seen from Earth as a series of moon phases (from the new moon phase, to the next new moon phase). The synodic revolution is slower, because the Moon needs to catch up with the Earth rotating in the same direction as the Moon. The synodic revolution of the moon has a time span of 29.5 days or to be more accurate approx 29 days, 12.734 hours.which of the following is an example of potential energy:
(choose 2)
- a fire
- a book standing still on a shelf in the library
- a printer that is not connected
- your cellphone, when you make a call to someone
Answers
Answer:
fire is a potential energy
When you stretch a spring 33 cm past its natural length, it exerts a force of 6
N. What is the spring constant of this spring?.
A. 51 N/cm
B. 0.18 N/cm
C. 198 N/cm
D. 1.8 N/cm
Answers
Answer:
B - 0.18N/cm
Explanation:
The spring formula:
Force = - (spring constant) · (distance stretched or squashed)
6 N = - (spring constant) · (33 cm)
= - (0.33 m) · (spring constant)
Spring constant = - (6 N) / (0.33 m)
= - 18.18 N/meter .
The negative signs mean that the spring always wants to go in the
opposite direction from where you forced it, and return to its relaxed
length. If you stretch it, it tries to get shorter, and if you compress it,
it tries to get longer.
What electromotive force would cause 200 mA of current to flow through a 500ohm resistor? 250 V (B) 10kV 2. 5kV (D) 100 V
Answers
The electromotive force would cause 200 mA of current to flow through a 500ohm resistor is (D) 100 V.
The electromotive force that would cause 200 mA of current to flow through a 500 ohm resistor is 100 V. This can be determined using Ohm's law.Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. Mathematically, Ohm's law is represented by the equation V = IR, where V is voltage, I is current, and R is resistance.To find the electromotive force, we can rearrange Ohm's law to be E = IR, where E is electromotive force. Substituting the given values, we have:E = (0.2 A)(500 Ω)E = 100 V .
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