the first system, and 300 J are added by heat to the second system. What will be the change in internal energy of the first system if it does 200 J of work
Answers
The change in internal energy of the first system is 500 J.
First system = ?Heat added to second system = 300 JWork done by the first system = 200 JWe need to find the change in internal energy of the first system. SolutionFirst, we need to find the heat absorbed or released by the first system.
This can be done using the First Law of Thermodynamics which states that, ΔU = Q - W Where, ΔU is the change in internal energy, Q is the heat absorbed or released by the system, and W is the work done by the system.
Now, using this formula we can find Q.
So,Q = ΔU + W We know that work done by the first system is 200 J and we need to find ΔU.
Therefore,Q = ΔU + 200 J Now, let's calculate the heat added to the second system in terms of internal energy.
We know that,Q = ΔU + WFor the second system,
Q = 300 J (heat added) and W = 0 (no work is done)Thus, 300 J = ΔU + 0ΔU = 300 J
Now, we can calculate the heat absorbed or released by the first system.
Q = ΔU + 200 JQ = 300 J + 200 JQ = 500 J
As a result, the first system's internal energy changed by 500 J.
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Related Questions
Which of the following situations violates the second law of
thermodynamics?
OA. A heat pump absorbs 100 J of heat from a cool reservoir and
releases 80 J of heat to a hot reservoir.
B. A heat engine absorbs 100 J of heat from a hot reservoir and
releases 70 J of heat to a cool reservoir.
C. A heat pump absorbs 100 J of heat from a cool reservoir and
releases 120 J of heat to a hot reservoir.
D. A heat engine absorbs 100 J of heat from a hot reservoir and
releases 20 J of heat to a cool reservoir.
Answers
C. A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.
What would violate the second law of thermodynamics?In order to operate, a heat engine must reject some of the heat it receives from the high-temperature source to a low-temperature sink.
A heat engine that violates the second law converts 100 percent of this heat to work. This is physically impossible. This heat engine violates the second law of thermodynamics.
The second law can also be stated as no heat engine can have a thermal efficiency of 100 percent.
The thermal efficiency of a heat engine is defined as the ratio of the work output to the heat input:
Clearly, if the thermal efficiency of a heat engine is 100 percent,
Qin=Wout
If the second law precludes a heat engine from having a thermal efficiency of 100 percent. A heat engine is a device that converts a portion of the heat supplied to it from a high-temperature source into work. The remaining heat is rejected to a low-temperature sink.
Therefore:
A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.
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[ A transformer is used to operate a 24V 48W lamp from the mains of 240V, assume its efficiency is 100% 1.)Calculate the current in the primary coil (2 marks) ii.)Determine the turn ratio of the transfomer (2 marks)
Answers
Input Power = Output Power
VI = 48
(240)I = 48
I = 0.2 A
Turn Ratio
= output voltage / input voltage
= 24/240
= 0.1
In golf, a club is swung to hit a small ball resting on the ground. Golfer A holds his club a short distance behind the golf ball, swings through a small distance, and hits the ball. The ball travels a small distance. Golfer B holds his club above his shoulder, swings through a large distance, and hits the ball. The ball travels a large distance. Explain why golfer B's golf ball travels a longer distance than golfer A's by using Newton's First Law.
Answers
Answer:
Golfer B hits his golf ball at a higher rate of speed and with more force. This means that golfer B's ball will travel for a longer period of time and a longer distance due to newtons first law, where it says an object in motion stays in motion, with the same speed and in the same direction.
Explanation:
How are electromagnetic waves different from sound or water waves?
Answers
Explanation:
Electromagnetic waves are different from sound or water waves in such a way that water and sound waves are called mechanical waves that requires a material medium for their propagation.
Electromagnetic waves do no require a material medium for propagation.
Electromagnetic waves are carried or transported by radiation and this can be passed through vacuums and different other materials. But mechanical waves such as water and sound waves requires a material medium for their propagation. They cannot pass through a vacuum.What is the best definition
of the atomic number?
A. the number of protons found in the nucleus
B. the number of protons found outside the
nucleus
C. the number of neutrons found in the nucleus
Answers
a is the correct answer
Explanation:
no.of proton defines atomic number in an atom
Answer: a
Explanation:
An atomic number is the number of protons found in the nucleus. The number of protons is equal to the number of electrons. The atomic mass the atomic number add the amount of neutrons.
Help needed,
A student applies a force to a cart to pull it across the gym at a constant speed during a
physics lab. A force of 22.4 N is applied to pull a loaded cart 10 meters. Determine the work
done upon the cart.
Answers
Answer:
224 J
Explanation:
Step one:
given data
Force applied = 22.4 N
distance = 10 meters
Required:
the work done
Step two:
The expression for the work done is
WD= force*distance
substitute
WD= 22.4*10
WD= 224 J
Two capacitors of values of 10 μF and 20 μF are connected in parallel, and in turn, are connected in series with a 30 μF capacitor. Find the equivalent capacitance of this arrangement.Group of answer choices15 μF12 μF10 μF7 μF
Answers
Answer:
15 μF
Explanation:
If two capacitors are in parallel, the equivalent capacitance is equal to the sum of the capacitances, so for the first two capacitors, we get:
C = 10 μF + 20 μF
C = 30 μF
Then, this capacitor C is in series with another capacitor of 30μF. For capacitor in series, we can find the equivalent as follows
\(\begin{gathered} \frac{1}{C_{eq}}=\frac{1}{30\mu F}+\frac{1}{30\mu F} \\ \frac{1}{C_{eq}}=\frac{1}{15\mu F} \\ C_{eq}=15\mu F \end{gathered}\)Therefore, the answer is 15μF
Please help me with this!
A student has a mineral sample with a mass of 35g. She then puts 20
mL of water into a graduated cylinder. When she puts the sample
into the cylinder, the water level rises to 30 mL. She then compares
the results to the following:
Augite 3.5 g/cm3
Galena 7.5 g/cm3
Pyrite 5.0 g/cm3
Sphalerite 4.0 g/cm3
Which substance did she find the density for?
Answers
The student finds the density for Augite = 3.5 g/cm³
Mass of the metal = 35g
Volume of water in the graduated cylinder = 20 mL
When the metal is placed in the cylinder filled with water, the water level rises to 30 mL.
So, the volume of the metal = 30 - 20 = 10 mL
1 mL = 1cm³
∴ 10 mL = 10 cm³
Now, we know that,
\(Density = \frac{Mass}{Volume}\)
\(Density = \frac{35g}{10 cm^{3} }\)
\(Density = 3.5 g/cm^{3}\)
Therefore, the student finds the density for Augite = 3.5 g/cm³
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A beam of visible light has a frequency of 4.5x10^14 Hz. What is the wavelength of this light? What color is this light?
Answers
Answer:
The wavelength is about 666.2 nm.
The color is red.
Explanation:
Recall the relationship between frequency and wavelength:
\(\displaystyle c = \lambda \nu\)
Solve for wavelength λ:
\(\displaystyle \lambda = \frac{c}{\nu}\)
Substitute and evaluate. Note that 1 Hz = 1 s⁻¹:
\(\displaystyle \begin{aligned} \lambda & = \frac{(2.998\times 10^{8} \text{ m/s})}{(4.5\times 10^{14} \text{ /s})} \cdot \frac{1\times 10^9\text{ nm}}{1\text{ m}} \\ \\ & = 666.2 \text{ nm}\end{aligned}\)
Therefore, the wavelength of the light is about 666.2 nm.
This corresponds with the red region of the visible spectrum.
when the applied voltage is large and the photoelectrons are repelled from the anode, what sign of electric charge has accumulated on the photocathode and anode?
Answers
When the applied voltage is high enough to repel photoelectrons from the anode, the anode has a positive charge, and the photocathode has a negative charge.
This is due to the fact that the photoelectrons are drawn to the negative charge of the photocathode and repelled by the positive charge of the anode due to the electric field produced by the voltage. As a result, the anode accumulates a positive charge while the photocathode accumulates a negative charge.
The electric charge that has accumulated on the photocathode is negative and the electric charge that has accumulated on the anode is positive when a high applied voltage is present and the photoelectrons are repelled from the anode. This is because photoelectrons, which are negatively charged, are being repelled from the anode due to the large applied voltage, causing a buildup of negative charge on the photocathode and a positive charge on the anode.
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A car traveling at a speed of 25 m/s increases its speed to 30 m/s in 10 sec. What is the acceleration of the car?
Answers
Answer:
.5m/s/s
Explanation:
V + at
Which phenomenon supports the particle model of light?
A. The photoelectric effect
B. Constructive interference
C. Destructive interference
O D. Diffraction
Answers
Answer:
The photoelectric effect
The photoelectric effect supports the particle model of light. Hence option A is correct.
What is photoelectric effect ?When a substance absorbs electromagnetic radiation, a process known as the photoelectric effect causes electrically charged particles to be discharged from or inside the material. When light strikes a metal plate, the action is frequently described as the ejection of electrons from the plate. In a more general definition, the substance may be solid, liquid, or gas, the radiant energy may take the form of infrared, visible, or ultraviolet light, X-rays, or gamma rays, and the discharged particles may include ions (electrically charged atoms or molecules) in addition to electrons. Because of the perplexing concerns it presented about the nature of light—particle versus wavelike behavior—that were eventually answered by Albert Einstein in 1905, the phenomenon was critically important in the development of modern physics.
Hence option A is correct.
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Explain why the total positive charge in every atom of an element is always the
same.
Answers
Answer:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
Explanation:
An atom has an equal quantity of positive and negative electric charges (the protons and electrons) when its electron and proton counts are equal (the protons). Since the atom has a total electric charge of zero, it is referred regarded as being neutral.
What is an atom?The atom is the smallest unit of matter that may be divided without resulting in electrically charged particles. Additionally, it is the tiniest substance with features like chemical elements. The atom is therefore the basic building block of chemistry.
Examine different electron arrangements in the electron shells that surround an atom's nucleus.
Examine different electron arrangements in the electron shells that surround an atom's nucleus. The rest is made up of a cloud of negatively charged electrons surrounding a positively charged nucleus made up of protons and neutrons. Compared to electrons, which are the lightest charged particles in nature, the nucleus is small and dense.
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What are two ways that asexual reproduction is better than sexual reproduction?
A. Asexual reproduction wastes less energy.
B. Asexual reproduction produces more offspring.
C. Asexual reproduction makes diverse offspring.
D.Asexual reproduction is more common.
Answers
The two ways that asexual reproduction is better than sexual reproduction are it wastes less energy and it produces more offspring.
The energy required in asexual reproduction is much lesser than that required in sexual reproduction. Asexual reproduction is a rapid process. Thus a large number of offspring are produced in a less amount of time. Identical offspring is produced in asexual reproduction.
Asexual reproduction is a reproduction process in which a offspring is produced by a single parent. It is common in plants. The offspring produced are clones of their parent.
Therefore, the two ways that asexual reproduction is better than sexual reproduction are it wastes less energy and it produces more offspring.
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A force is exerted on a box an an equal and opposite force is exerted by the box. what explains this?
Answers
Answer: What is the force that opposes motion between two surfaces in contact with each ... How is the relationship among mass, force and acceleration explained? ... When a force is exerted on a box, an equal and opposite force is exerted by the box.
the wavelength of blue light is greater than red light and its energy is greater. True or False
Answers
Answer:
False
Explanation:
The wavelength of red light is greater than blue light. Its energy is less.
Both statements are false. Search for a graphic of the "electromagnetic spectrum." Many will note the wavelengths of the various regions (IR, UV, Visible, Microwave, etc. Observe the relationships. Red has less energy than blue. That sounds counterintuitive, based on artist's use of red to connote fire or some energetic situation. But the red in a fire obscures human vision to the blues and UV radiation from the same source. A welder uses a UV shield to blocjk these wavelengths, to avoid eye damage.
what is physical change ?
Answers
Answer:
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
A tube of uniform cross sectional area closed at one end contain some dry air which is sealed by a thread of Mercury 15. 5cm long. When the tube is held vertically with the closed end at the bottom the air column is 22. 0cm long, but when it is held horizontally the air column is 26. 4cm calculate the atmospheric pressure. ?
Answers
The air column is 22 cm long when the tube is held vertically with the closed end at the bottom; however, when it is held horizontally, the air column is 26 cm long. 101.6 kPa is the atmospheric pressure.
The mercury thread's two tiers are separated in height by 26.4 - 15.5 = 10.9 cm. The pressure difference between the atmospheric pressure and the pressure of the trapped air column is corresponding to this height difference. We may calculate the atmospheric pressure by equating the pressure difference with the height difference using the equation P = gh, where P is pressure, is density, g is acceleration due to gravity, and h is height.
Calculations: Vertical air column pressure is given by P = gh.
P = (9.81 m/s2) * (1.29 kg/m3) * (0.22 m)
P = 0.28 kPa
Air column pressure while horizontal: P = gh P = (1.29 kg/m3) * (9.81 m/s2) * (0.264 m)
P = 0.33 kPa
Difference in pressure: 0.33 kPa - 0.28 kPa = 0.05 kPa
Atmospheric pressure = 0.05 kPa + 101.3 kPa (standard atmospheric pressure) = 101.6 kPa.
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A ball rolls across a table at a constant speed for 0.62 m. It then falls onto the floor. It takes the ball 0.35 seconds to cover the 0.62 m path, as shown in the drawing below. The table top is 1.2 meters above the floor. Find x the distance that the bail travels horizontally after it eaves the table top.
Answers
Answer:
Explanation:
Missing drawing!
draw a figure of a simple pendulum explain its amplitude and effective length ?
Answers
Answer:
Explanation:
A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.
In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.
Amplitude:
The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."
Effective Length:
The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."
It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.
Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.
Describe possible factors influencing incoming solar radiation,
composition of incoming radiation, and what ultimately happens
(percent breakdown) to the radiation that does enter the
atmosphere.
Answers
Factors influencing incoming solar radiation include solar angle, atmospheric conditions, and surface characteristics.
Several factors influence the amount of solar radiation reaching Earth's surface. The solar angle, determined by the Earth's tilt and position in its orbit, affects the intensity of radiation. Atmospheric conditions such as cloud cover, aerosols, and pollution can scatter or absorb radiation. Surface characteristics, such as albedo (reflectivity) and vegetation, also influence the amount of incoming radiation.
The composition of incoming solar radiation consists primarily of visible light, ultraviolet (UV) radiation, and infrared (IR) radiation. Visible light is the range of wavelengths perceived by human eyes. UV radiation has shorter wavelengths and can be harmful to living organisms. IR radiation has longer wavelengths and carries heat energy.
Once solar radiation enters the atmosphere, several processes occur. Approximately 30% of incoming radiation is reflected back into space by clouds, atmospheric particles, and the Earth's surface. About 20% is absorbed by the atmosphere, including gases like ozone and water vapor. The remaining 50% reaches the Earth's surface, where it is absorbed by land, water, and vegetation, contributing to various physical and biological processes such as heating the Earth's surface, driving weather patterns, and supporting photosynthesis.
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Please help help pls :::
Answers
Answer:
radio since they use radio telescopes.
a car moving south speeds up from 10 m/s to 40 m/s in 15 seconds. what is the car’s acceleration?2 m/s215 m/s230 m/s250 m/s2
Answers
The acceleration of this car include the following: A. 2 m/s².
How to calculate the acceleration of this car?In Science, the acceleration of a car can be calculated by using this mathematical expression:
a = (V - U)/t
Where:
a represents the acceleration measured in meters per seconds square (m/s²).V represents the final velocity measured in meters per seconds (m/s).U represents the initial velocity measured in meters per seconds (m/s).t represents the time measured in seconds.By substituting the given parameters into the acceleration formula, we have;
Acceleration, a = (40 - 10)/15
Acceleration, a = 30/15
Acceleration, a = 2 m/s².
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A 70.0Kg cyclist Rides a 15.0kg
mountain Bike with a Speed of
15m/s Calculate the magnitude
of the momentum of the Bike-rider
system Round your answer to the nearest hundred
Answers
Answer:
\(1275 kg*m/s\)
Explanation:
We'll use the momentum equation:
\(p=mv\)
where:
p = momentum
m = mass
v = velocity
Since we're doing the magnitude of momentum of the system, we'll add the mass of the cyclist and the mountain bike together:
\(70.0 kg + 15.0kg=85.0 kg\)
Given that, we can now substitute our given values into the momentum equation:
\(p=mv\\p=85.0kg*15.0m/s\)
Our final answer is:
\(p= 1275 kg*m/s\)
calculate approximately how long it takes light to travel from the sun to pluto
Answers
It takes approximately 5.5 hours for light to travel from the Sun to Pluto
The distance from the Sun to Pluto varies depending on the positions of the two objects in their orbits, as both the Sun and Pluto are constantly moving. However, on average, the distance from the Sun to Pluto is about 5.9 billion kilometers or 3.7 billion miles.
The speed of light is approximately 299,792 kilometers per second or 186,282 miles per second.
Using these values, we can calculate that it takes approximately 5.5 hours for light to travel from the Sun to Pluto
5.9 billion km ÷ 299,792 km/s
=> 19710 seconds
=> 5.5 hours.
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Light Microscope:Name four lenses & list their magnification What is the magnification of the ocular lensWhat is the total magnification?
Answers
The total magnification in this case would be 400x. The four lenses in a light microscope are:
Scanning objective lens: Magnification of 4x
Low-power objective lens: Magnification of 10x
High-power objective lens: Magnification of 40x
Oil-immersion objective lens: Magnification of 100x
The magnification of the ocular lens, which is the lens closest to the eye, is usually 10x.
To calculate the total magnification, you multiply the magnification of the objective lens by the magnification of the ocular lens. For example, if you are using the high-power objective lens with a magnification of 40x and the ocular lens with a magnification of 10x, the total magnification would be: Total magnification = Magnification of objective lens × Magnification of ocular lens
Total magnification = 40x × 10x
Total magnification = 400x
In a light microscope, the objective lens is the primary lens responsible for magnifying the sample being viewed. The four objective lenses mentioned earlier have different magnifications, which allow the user to view the sample at different levels of detail.
The scanning objective lens has the lowest magnification of 4x and is typically used to locate the specimen on the slide. The low-power objective lens has a magnification of 10x and is used for initial viewing of the specimen. The high-power objective lens has a magnification of 40x and is used for more detailed observation of the specimen. The oil-immersion objective lens has the highest magnification of 100x and is used for the most detailed observation of the specimen.
The ocular lens, also known as the eyepiece, is the lens closest to the eye of the viewer. Its magnification is usually 10x, although some microscopes may have ocular lenses with different magnifications.
To calculate the total magnification, you multiply the magnification of the objective lens by the magnification of the ocular lens. It is important to note that the total magnification does not necessarily indicate the resolution of the image. The resolution of the image depends on several factors, including the quality of the optics, the numerical aperture of the objective lens, and the wavelength of the light used to illuminate the sample.
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Pls help me I need help thanks.
Answers
Answer: The Answer Is A
Explanation:
Date:
Page:
# Excercise.
7.
A very short answer questions.
what is acceleration due to gravity? what is
value of 'g’ on equatorial region and
polar region of the earth?
the
Answers
Answer:
See the answer below
Explanation:
Acceleration due to gravity (g) is the accelerational force experienced by a body as a result of the influence of the earth's gravitational force. It is a vector quantity, that is, it has both magnitude and direction.
The acceleration due to gravity is inversely proportional to the square of the radius of the earth. Hence, g at the equatorial region is slightly lesser (9.780 m/s2) than that of the polar regions (9.832 m/s2) of the earth because the earth bulges at the equator leading to a higher radius than at the poles.
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Because the boy is slowing down, his velocity decreases over time. Use the final and starting velocities in the data table to calculate his average acceleration. Use the equation , where t is time, ux is initial velocity, vx is final velocity, and ax is acceleration. Use time t = 1.6 seconds, which is calculated using values from the table (1.8 − 0.2).
Answers
Answer:
The answer should be 0.825
Explanation:
I took like 20 mins to figure this out lol
Normal day muscle contraction and a physical activity muscle contraction
Answers
Muscle contraction occurs during both normal day-to-day activities and physical activity. However, the intensity and duration of the contractions differ between the two scenarios.
Muscle contraction is a fundamental process that enables movement in organisms, including humans. During a normal day, muscle contraction is relatively mild and occurs in response to routine activities such as walking, breathing, and even maintaining posture.
These contractions are not very intense and do not last for extended periods as they are efficient and optimized for regular use.
On the other hand, during physical activity, muscle contraction is much more demanding and frequent.
This is because physical activity requires the body to exert an increased effort, leading to an increase in muscle activation.
This increased muscle activity may be coupled with other changes such as alterations in heart rate, oxygen uptake, and metabolism.
Physical activity muscle contractions are therefore more intense and sustained, leading to greater energy expenditure and often causing fatigue.
In conclusion, muscle contraction is vital in enabling movement, and it occurs in both normal day-to-day activities and physical activity. However, the intensity and duration of the contractions differ between the two scenarios.
Normal day-to-day activities involve mild and efficient contractions, while physical activity requires more demanding and prolonged contractions.
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