A gas does work by changing its volume, adhering to the law of conservation of energy and resulting in increases in energy, pressure, and/or temperature.
A gas can do work by changing its volume. When a gas in a cylinder expands, it exerts a force on the piston and moves it, doing work. According to the Ideal Gas Law, work done by a gas results in an increase in its energy, which can manifest as an increased internal kinetic energy due to the motion of its atoms and molecules. This concept adheres to the law of conservation of energy, meaning that energy within a closed system is neither created nor destroyed, but can change forms. An example of work being done by a gas is when you inflate a bicycle tire; the air pressure and temperature increase inside the tire due to the work done by the pump.
Thus, the correct answer to how a gas does work is A. By changing volume.
An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
What are the short eruptions of intense high-energy radiation from the sun's surface called? Corona Prominences Solar flares Sunspots
The answer is Solor flare, this is because this is a sudden eruption of energy that is magnetic on or even near the surface of the star, the sun.
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Do non metals have luster
Explain why sound travels faster through iron than through air
The wheel and axe is a modified incline plane
A.True
B.False
Which organelles is used to transport materials through the cell
1. Describe the formation of the four types of fronts and the weather associated with each
2. How does the burning fossil fuels influence global temperature. How might the change in temperature affect other parts of Earth, such as the hydrosphere and biosphere
Warm front
Stationary front
Occluded front
What is the focal length of a lens?
Subtitle is the half-life of an element is 10 years how many half-lives will it take before only about 6% of the original sample remains
All of the following statements describe how rubbing one object on another creates static electricity except:
A. Rubbing converts neutrons to protons, increasing the charge.
B. Charge is transferred from one object to the other.
C. The electrons get ripped off one object and held by the other.
D. Rubbing allows the object that has the greater electron attraction to take them.
Answer:
A. Rubbing converts neutrons to protons, increasing the charge
Explanation:
Rubbing two objects creates static electricity. It is also known as charging by friction. When two objects having different electron affinity are rubbed together, the one with greater electron attraction rips off the electrons from other object. In this way charge is transferred from one to another. The one losing the electrons becomes positively charged and the one gaining the electrons becomes negatively charged. Neutrons do not convert to protons. Thus, this is a wrong statement.
What type of roadway has the highest number of hazards per mile?
The roadway with the highest number of hazards per mile is city roads and street.
The city has a high population of people, this is a combination of both men and women. These categories of people need vehicles to move around the city, they need it go to the office, school, markets and so on.
Due to the high number of individuals in the city there tend to be a high level of traffic, this can lead to accident or other type of road hazards.
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A train travels 120 km In 2 hours and 30 minutes what’s its average speed
Explain how the "natural frequency" of objects must be considered/analyzed in places like concert halls and airplanes.
What do astronomers mean when they say that the universe is isotropic?
A transformer has 20 turns in its primary coil and 60 turns in its secondary coil. The input voltage for the transformer is 25 volts. What is the output voltage?
If the sun were replaced by a 1-solar-mass black hole, what would be the gravitational pull of the black-hole "sun" on earth?
The gravitational pull that a 1-solar-mass black hole would exert on Earth is the same as the sun. This is because gravitational pull is determined by mass and distance. However, life on Earth would be greatly impacted due to the lack of sunlight and heat.
Explanation:If the sun was replaced by a 1-solar-mass black hole, the gravitational pull it exerts on Earth would be the same as that of the sun. This is due to the fact that gravitational pull is determined by mass and distance. Considering the mass would be the same and the distance between Earth and the black hole would remain constant, the gravitational pull remains unaffected.
However, without the sun's light and heat, life as we know it on Earth would not be sustainable. It's also important to note that while the gravitational pull remains the same, various other aspects of having a black hole instead of a sun would drastically impact our planet.
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A student wants you to demonstrate that an electric current will produce a magnetic field. Which set of objects could be used to demonstrate this? A) A battery, a coil of wire and a compass. B) A compass, some paper clips and a battery. C) A battery, an iron nail and a long copper wire. D) An iron nail, a permanent magnet and a battery.
Answer:
A
Explanation:
A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.
Answer:
a battery, a coil of wire and a compass
Explanation:
A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.
What is the frequency corresponding to a period of 8.01 s?
The frequency corresponding to a period of 8.01 seconds is calculated using the formula f = 1/T, resulting in a frequency of approximately 0.125 Hz.
Explanation:The question relates to the concept of period and frequency in wave motion which is a topic in Physics. To find the frequency corresponding to a period of 8.01 s, you use the formula f = 1/T, where f is the frequency and T is the period. Applying this formula:
f = 1/T = 1/8.01 s ≈ 0.125 Hz
Therefore, the frequency corresponding to a period of 8.01 seconds is approximately 0.125 Hertz (Hz).
What is an outward curving lens
An outward curving lens, or convex lens, converges light rays and is an essential element in optical devices like microscopes and cameras. It has a positive radius of curvature by convention. Convex lenses help correct farsightedness by focusing light rays onto a specific point.
An outward curving lens, also known as a convex lens or a converging lens, is a lens that is curved outward on both sides, resembling the intersection of two spheres. This type of lens causes parallel light rays to converge or come to a point after passing through it. The radius of curvature for a convex surface is positive by convention, which helps in the lens-maker's equation for calculating the focal length of the lens.
Convex lenses are widely used in various optical devices such as microscopes, telescopes, cameras, and eyeglasses to correct farsightedness by focusing light rays onto a specific point, resulting in a clear image.
The graph shows the solubility of different compounds at different temperatures. Solubility refers to how much of something will dissolve in the given amount of water at a particular temperature. ________ shows the greatest change in solubility over the temperature range shown. A) KBr B) KNO3 C) NaCl D) NaClO3
Answer:
b
Explanation:
From the graph, it is clear that potassium nitrate, KNO₃ undergo great change in solubility over the temperature range.
What is solubility?
Solubility of a substance is the fraction of its concentration which is dissolved in a solvent at a specified temperature. Solubility of a substance is dependent on the nature of both solute and solvent.
The factors which determine the solubility of a solute are its bond types, molecular weight, temperature and pressure. As the temperature increases, the intermolecular force attraction between solute molecules decreases leading to solvent- solute interaction results in greater solubility.
From the graph it is clear that solubility of KNO₃ changes rapidly with temperature. Whereas , other compounds dose not show this steep curve with increase in temperature. Thus option B is correct.
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A car approaches a police radar gun. how does the wavelength of the signal detected within the car compare with that emitted by the radar gun? the wavelength detected inside the car is longer. the wavelength detected inside the car might be shorter or longer depending on speed range. the wavelength detected inside the car is the same. the wavelength detected inside the car is shorter.
Strictly speaking, when an object acquires a positive charge by the transfer of electrons, what happens to its mass? (think small.)
Sasha uses a basketball and a tennis ball to represent two astronomical bodies based on their sizes. Which of the following representations is the most correct based on what Sasha has? The basketball represents Earth and the tennis ball represents the solar system. The basketball represents the moon and the tennis ball represents the solar system. The basketball represents the solar system and the tennis ball represents Earth. The basketball represents the solar system and the tennis ball represents the Milky Way.
Answer:
C
Explanation:
im doing the test rn but i think this is right correct me if im wrong also have a good day or night
Which of these is NOT large and gaseous?
A) Jupiter
B) Mercury
C) Saturn
D) Uranus
Explain why a cow that touches an electric fence experiences a mild shock
Final answer:
A cow experiences a mild shock from an electric fence because its body conducts electricity, completing a circuit to the ground, which is designed to be unpleasant but not harmful. Modern electric fences use pulsed currents to allow detachment, with safety standards keeping shocks below the harmful threshold.
Explanation:
When a cow touches an electric fence, it experiences a mild shock due to the principles of electricity and current flow in living organisms. Our bodies, similar to the cow's, are good conductors because of the high water content. This conductivity allows electric currents to flow through us, following the path of least resistance to reach the ground, often referred to as 'earthing'. Electric fences are designed to give a shock that is unpleasant but not harmful, utilizing a small current that can cause a sensation but is usually not enough to damage tissue.
Modern electric fences are now pulsed on and off to allow someone who touches them to pull away. This design is vital for safety, preventing prolonged exposure that could lead to muscular contractions strong enough to prevent letting go of the fence. Shocks from electric fences are typically below 5 mA (milliamps), which is the maximum allowed shock according to many safety standards. This threshold ensures the shock is felt but remains within a range considered to be harmless.
Additionally, the earth acts as a natural electron sink, allowing currents to dissipate safely when an individual or animal completes the circuit by touching the fence while grounded. However, insulating materials such as rubber shoes can break this path, preventing the shock, which is why electrical safety protocols often include insulating gear to prevent the flow of electrical currents through the body.
A 10 - kg object is dropped from rest. after falling a distance of 50 m, it has a speed of 26 m/s. how much work is done by the dissipative (air) resistive force on the object during this descent?
Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table. Which lists the springs based on the amount of elastic potential energy, from greatest to least? X, Y, W, Z X, W, Y, Z Z, W, Y, X Z, Y, W, X
Answer:B
Explanation:
XWYZ
HELP ASAP
A roller coaster is 1/2 way down, what form of energy does this roller coaster have at this point?
KINETIC, POTENTIAL, OR BOTH KINETIC AND POTENTIAL ENERGY?
Noise caused by not understanding somebody's accent is considered:
A) semantic
B) temporal
C) internal
D)external
Answer:
semantic.
Explanation:
100% correct
ANALOGY: Mars bar: planet as Milky Way: __________
Star cluster
Candy bar
Constellation
Galaxy