Answer:
Zero
Explanation:
The work done by a force on an object is given by:
[tex]W=Fd cos \theta[/tex]
where
F is the magnitude of the force
d is the displacement of the object
[tex]\theta[/tex] is the angle between the direction of the force and the displacement
In this problem, the force is the gravitational attraction between the Earth and the Sun, which points always towards the Sun. Therefore, the force is always perpendicular to the displacement of the Earth (which moves tangentially to its circular path). As a result, the angle in the formula is 90 degrees, which means that the cosine part is zero: so, the work done by the gravitational force is always zero, because the force is always perpendicular to the displacement.
What two factors affect the speed of a sound wave as it travels through a medium? A. The energy transferred by the wave and the density of the medium B. The type of medium and the energy transferred by the wave C. The type of medium and the temperature of the medium D. The temperature of the medium and the energy transferred by the wave
In general, sound (mechanical wave) travels faster in solids than in liquids or gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is: density).
In other words: The speed of sound varies depending on the medium through which the sound waves travel.
In addition, it varies with changes in the temperature of the medium. This is because an increase in temperature means that the frequency of interactions between the particles that transport the vibration increases, hence this increase in activity increases the speed. That is why the speed of sound in a gas is not constant, but depends on the temperature.
For example, the higher the air temperature, the greater the velocity of propagation.
Answer:
the type of medium and the temperature of the medium
Explanation:
edge quiz 2021
Solstice that occurs in december in the southern hemisphere is called
Answer: Southern Summer Solstice
Explanation:
Solstices are astronomical events that occur twice a year (June and December), in which the Sun reaches its highest or lowest apparent height in the sky, and the duration of the day or night are the maximum of the year, respectively. This is because the Sun reaches the maximum north or south declination with respect to the terrestrial equator.
In this case we will talk about the december solstice in the southern hemisphere, which occurs regularly around December 21st and marks the beginning of summer in this hemisphere and the beginning of winter in the northern hemisphere.
During this season of the year the days are longer than the nights, and as we get closer to the South Pole, we will have more hours of sunlight.
One model for a certain planet has a core of radius R and mass M surrounded by an outer shell of inner radius R, outer radius 2R, and mass 4M. If M = 6.24 × 10^24 kg and R = 4.11 × 10^6 m, what is the gravitational acceleration of a particle at points (a) R and (b) 3R from the center of the planet?
(a) [tex]24.6 m/s^2[/tex]
At a distance r=R from the centre of the planet, there is no effect due to the outer shell: so, the gravitational field strength at r=R is only determined by the gravity produced by the core of the planet.
So, the strength of the gravitational field is given by
[tex]g= \frac{GM}{R^2}[/tex]
where
G is the gravitational constant
M = 6.24 × 10^24 kg is the mass of the core of the planet
R = 4.11 × 10^6 m is the radius of the core
Substituting into the equation, we find
[tex]g= \frac{(6.67\cdot 10^{-11})(6.24\cdot 10^{24} kg)}{(4.11\cdot 10^6 m)^2}=24.6 m/s^2[/tex]
(b) [tex]13.7 m/s^2[/tex]
at distance r=3R from the centre, the particle feels the effect of gravity due to both the core of the planet and the outer shell between R and 2R.
So, we have to consider the total mass that exerts the gravitational attraction at r=3R, which is the sum of the mass of the core (M) and the mass of the shell (4M):
M' = M + 4M = 5M
Therefore, the gravitational acceleration at r=3R will be
[tex]g'= \frac{G(5M)}{(3R)^2}=\frac{5}{9}\frac{GM}{R^2} = \frac{5}{9}g[/tex]
And susbstituting
g = 24.6 m/s^2
found in the previous part, we find
[tex]g' = \frac{5}{9} (24.6 m/s^2)=13.7 m/s^2[/tex]
The gravitational acceleration at point R is approximately 9.85 m/s². the gravitational acceleration at point 3R is approximately 1.09 m/s².
The formula for gravitational acceleration:
g = (G × M) / r²
where:
g is the gravitational acceleration,
G is the gravitational constant,
M is the mass of the planet,
and r is the distance from the center of the planet.
Given:
M = 6.24 × 10²⁴ kg
R = 4.11 × 10⁶ m
(a) At point R:
g = (G × M) / R²
g = (6.674 × 10⁻¹¹ × 6.24 × 10²⁴) / (4.11 × 10⁶)²
g = 9.85 m/s²
Therefore, the gravitational acceleration at point R is approximately 9.85 m/s².
(b) At point 3R:
g = (G × M) / (3R)²
g = (6.674 × 10⁻¹¹ × 6.24 × 10²⁴) / (3 × 4.11 × 10⁶)²
g = 1.09 m/s²
Therefore, the gravitational acceleration at point 3R is approximately 1.09 m/s².
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The total number of protons and neutrons in the nucleus of an atom
Answer:
Is the mass number
Explanation:
Every atom is usually identified by using two different numbers:
- Atomic number: generally labelled with Z, corresponds to the number of protons in the nucleus, so Z = p
- Mass number: generally labelled with A, corresponds to the number of protons+neutrons in the nucleus, so A = p + n
To find the number of neutrons in a nucleus, therefore, we can do
n = A - Z
How much smaller is an atom than a speck of dust
Answer:
an atom is about a trillion times smaller then a speck of dust.
Explanation:
hope this helps :)
An atom is 4 times smaller than a speck of dust when both are compared.
The average radius of an atoms is about 0.1 nm ( 0.1 x 10⁻⁹ m).
The average radius of a speck of dust is about 0.1 x 10⁻⁵ m.
The ratio of these particles can be compared as follows;
[tex]ratio = \frac{0.1 \times 10^{-4}}{0.1 \times 10^{-9}} = 10^4[/tex]
Thus, we can conclude that when a speck of dust is compared to an atom, an atom will be 4 times smaller than a speck of dust.
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Light is described as having a dual wave-particle nature. Which piece of evidence provides support for the model of light as a wave?
Light causes electrons to be released when it strikes a metal surface.
Light reflects when it hits a surface.
Packets of energy called photons.
Light travels fastest through a vacuum.
The evidence supporting the wave model of light is its ability to travel fastest through a vacuum. This property is due to its wave nature, which allows it to propagate without needing a medium.
Explanation:The piece of evidence that supports the wave model of light is that light travels fastest through a vacuum. This is because, according to wave theory, light is a type of electromagnetic wave that doesn't need a medium to propagate, thus it can travel through empty space (a vacuum) at its highest speed, approximately 299,792 kilometers per second. Other properties such as reflection or causing electrons to be released from a metal surface also occur, but they can be explained by both wave and particle models.
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Light reflects when it hits a surface, which supports the model of light as a wave. correct answer is 2. Light reflects when it hits a surface.
Light is known to exhibit a dual wave-particle nature. Light as a wave is supported by phenomena such as interference and diffraction.
Of the given choices, the piece of evidence that supports the model of light as a wave is that light reflects when it hits a surface. Reflection is a behavior consistent with wave theory because waves can bounce off surfaces.
This behavior is explained by wave theory, demonstrating light's dual wave-particle nature. Interference and diffraction are additional examples supporting light's wave-like properties.
complete question:
Light is described as having a dual wave-particle nature. Which piece of evidence provides support for the model of light as a wave?
Light causes electrons to be released when it strikes a metal surface.Light reflects when it hits a surface.Packets of energy called photons.Light travels fastest through a vacuum.How many electrons are contained in the atom 6li?
Answer:
3 electrons
Explanation:
Lithium is the third element of the periodic table, so its atomic number is 3:
Z = 3
This means that an atom of lithium contains 3 protons. Moreover, for a neutral atom the number of protons in the nucleus is equal to the number of electrons: this means that an atom of lithium contains 3 electrons as well.
In this specific case, we have an isotope of Lithium-6 (6Li), which has a mass number of 6:
A = 6
This means that the atom contains 6 protons+neutrons in the nucleus, so it contains 6-3 = 3 neutrons.
As more resistors are added in parallel across a constant voltage source, the power supplied by the source
a. decreases.
b. does not change.
c. increases.
As more resistors are added in parallel across a constant voltage source, there are more paths for current to take. So more current dribbles out of the source, and the total current supplied by the source increases.
The power supplied by the battery is (voltage) x (current). So if the voltage is constant and the current increases, the power being supplied must also increase.
choice-c
The law of conservation of mass states that
Hello There!
The law of conservation of mass states that Matter/substances/energy can not be created or destroyed, it can only be transferred from state to state.
What would be the radius of the earth if it had its actual mass but had the density of nuclei?
Final answer:
If the Earth had the density of a nucleus, its radius would be only about 200 meters compared to the actual radius of approximately 6.4 x 10^6 meters.
Explanation:
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10-15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10-10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth's density were equal to the average nuclear density, the earth's radius would be only about 200 meters (earth's actual radius is approximately 6.4 x 106 meters, 30,000 times larger).
Which of the following characteristics of Earth's relationship to the Sun explains the existence of Earth's seasons? Choose all that apply.
Earth has a satellite called the Moon, which rotates around Earth.
Earth spins on its axis, completing one rotation each day.
Earth's axis always points in the same direction relative to the stars.
Earth's axis is tilted relative to its orbital plane.
Earth orbits around the Sun, completing one orbit each year.
The existence of Earth's seasons is explained by the tilt of Earth's axis and its orbit around the Sun.
Explanation:The existence of Earth's seasons is explained by two characteristics of Earth's relationship to the Sun. First, Earth's axis is tilted relative to its orbital plane. This tilt causes different parts of Earth to receive different amounts of sunlight throughout the year, creating the seasons. Second, Earth orbits around the Sun, completing one orbit each year. As Earth moves in its orbit, different parts of the planet are tilted toward or away from the Sun, resulting in the changing seasons.
Final answer:
The existence of Earth's seasons is primarily due to Earth's axis being tilted relative to its orbital plane and Earth completing one orbit around the Sun each year.
Explanation:
The existence of Earth's seasons can be explained by the following characteristics of Earth's relationship to the Sun:
Earth orbits around the Sun, completing one orbit each year.
These two factors combined explain why different parts of Earth receive varying amounts of sunlight throughout the year, resulting in seasons. The tilt of the Earth's axis ensures that at different times of the year, either the Northern or Southern Hemisphere will be tilted towards the Sun, receiving more direct sunlight and experiencing summer, while the other hemisphere will be tilted away, receiving less direct sunlight and experiencing winter.
Earth's rotation on its axis, which occurs once a day, simply provides the cycle of day and night, and its axis always pointing in the same direction relative to the stars, ensures consistency in the orientation of Earth's tilt as it orbits the Sun.
In this lab you will use a cart and track to explore various aspects of motion. You will measure and record the time it takes the cart to travel certain distances, and then complete some calculations.
Answer:
a change in position
a change in velocity
acceleration
a connection between acceleration, velocity, and position
Explanation:
This physics lab is about studying the principles of motion. It involves measuring and recording the distance and time taken by a cart on a track to understand Newton's laws of motion, speed, and acceleration.
Explanation:In this physics lab, the core principle being explored is motion. The student is expected to use a cart and a track set up to investigate and learn more about motion by measuring and recording the time that it takes the cart to cover specific distances. The motion of an object is dictated by the principles of physics, particularly Newton's laws of motion. In this case, the cart's motion on the track is described primarily by the first two of these laws.
The first law, also known as the inertia law, suggests that an object will retain its state of motion unless acted upon by an external force. This principle may help explain why the cart continues to move even after you stop applying force. The second law pertains to how the velocity of an object changes when it is subjected to an external force. By measuring different aspects of the cart’s motion, such as the distance it travels and the time it takes, students can calculate the speed and acceleration of the cart under different conditions. This direct, hands-on approach is a practical way to understand Newton’s laws and the concepts of speed and acceleration.
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On the Celsius scale, at what temperature does water boil?
Answer:
at 100°Celsius water starts to boil
For this case we have that by definition, the boiling temperature (boiling is the passage from liquid to gaseous state) of the water is dependent on the pressure to which the liquid is exposed.
At sea level, the boiling water temperature occurs at 100 degrees Celsius.
Answer:
100 degrees Celsius
Consider an air-filled charged capacitor. How can its capacitance be increased?
It doesn't matter whether the capacitor happens to be charged or not. It can be charged to 1/2 volt, or it can be charged to 1 thousand volts, or it can be totally uncharged and wrapped in tissue in a box on the shelf. None of that has any effect on its capacitance. Whatever capacitance it has, that's what it has.
In order to increase its capacitance, you would have to . . .
-- increase the area of the plates,
or
-- move the plates closer together,
or
-- fill the space between the plates with a substance that has a greater dielectric constant than air has.
The capacitance of an air-filled capacitor can be increased by reducing the distance between plates, increasing their surface area, or using a material with a higher dielectric constant in place of air.
Explanation:In physics, the capacitance of an air-filled charged capacitor can be increased by three main ways: reducing the distance between the plates, increasing the surface area of the plates, and using a material with a higher dielectric constant in place of air.
Reducing the distance between the plates increases the electric field between the plates, so more charge can be stored. Increasing the surface area of the plates provides more space for charge to accumulate, thereby increasing the capacitance. Using a dielectric material with a higher dielectric constant than air in between the plates can also enhance the capacitor's ability to store charge.
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What is the work done by the electric force to move a 1 c charge from a to b?
The work done by the electric force to move a 1 c charge between two points is calculated by multiplying the charge by the electric potential difference between those points.
Explanation:The work done by the electric force to move a 1 c charge from point a to point b depends on the electric potential difference, or voltage, between points a and b. The work done is calculated by the equation: Work = Charge * Electric Potential Difference. If we know the electric potential difference between points a and b, we can substitute it into the equation to find the work done. For example, if the potential difference between a and b is 5 volts, the work done to move a 1 c charge would be 1 c * 5 V = 5 Joules.
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Why does water have a high surface tension
Answer:
The water molecules attract one another due to the water's polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen cause water to "stick" together. This is why there is surface tension and takes a certain amount of energy to break these intermolecular bonds.
Explanation:
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The type of graph used to show how a part of something relates to the whole is which of the following?
Answer:
Circle or pie graph is used to show how a part of something relates to the whole.
Explanation:
Pie graphs are easy to read and can present a very clear picture of the relationships.
Question:
The type of graph used to show how a part of something relates to the whole is which of the following? a. circle graph b. bar graph c. line graph d. direct proportion
Answer:
The type of graph used to show how a part of something relates to the whole is circle graph.
Explanation:
Circle graph also denoted as pie chart. It is generally used to show data analyzed in a small group. The circle graph is made in different parts based on the difference in the properties of the sample. It generally shows the relative analysis of each property for a given set of samples.
So, each parts in the circle graph will tell us the percentage of a property among the other properties present in the sample. Like we can say, if in a class of 100 students, 25 students are girls and 75 students are boys can be drawn in circle graph with two parts having smaller area for girl students and bigger area parts for boy students.
What is the magnification of a real image if the image is 10.0 cm from a mirror and the object is 50.0 cm from the mirror ? Use the equation m=-di/do.
A. -5.0
B. 5.0
C. 0.20
D. -0.20
Answer:
D
Explanation:
m = -di/do
Given:
di = 10.0 cm
do = 50.0 cm
Find: m
m = -(10.0) / (50.0)
m = -0.200
The magnification of a real image is -0.20
Image from a mirror = 10 cm
Object from the mirror = 50 cm
What is magnification?The process of enlarging the apparent size of the object is called
magnification.
Here, the formula is given as
m = - di / d₀
m - magnification
di - distance of the image
do - distance of the object
m = - 10 / 50
= - 0.20
Hence, Option D is the correct answer.
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A man pushes on a trunk with a force of 250 newtons. The trunk does not move. How much positive work is done on the trunk?
0.0 J
-250 J
250 J
125 J
Answer:
F is 250 N
d is 0 m
F x d
=250 x 0
=0
The answer is 0.0 J.
Answer:
0.0 J
Explanation:
What percentage of water vapor is found in the air
Answer:
. The percentage water vapor in surface air varies from 0.01% at -42 °C (-44 °F) to 4.24% when the dew point is 30 °C (86 °F).
hope this helps :)
Explanation:
Answer:
0 to 4 percent
Explanation:
Water vapor varies by volume in the atmosphere from a trace to about 4%. Therefore, on average, only about 2 to 3% of the molecules in the air are water vapor molecules. The amount of water vapor in the air is small in extremely arid areas and in location where the temperatures are very low (i.e. polar regions, very cold weather). The volume of water vapor is about 4% in very warm and humid tropical air.
So, why can't the amount of water vapor in the air be greater than 4%? The answer is because temperature sets a limit to how much water vapor can be in the air. Even in tropical air, once the volume of water vapor in the atmosphere approaches 4% it will begin to condense out of the air (rain). The condensing of water vapor prevents the percentage of water vapor in the air from increasing. If temperatures were much warmer, there would be a potential to have more than 4% water vapor in the atmosphere. Think about the steam trapped in a tea kettle. The very warm temperatures and higher pressures allow for a large amount of water vapor to exist in the air within the tea kettle. Just from watching the steam leave the tea kettle, one can get an idea of the water vapor density within that kettle. The amount of water vapor within the air in the kettle is greater than 4%.
If the earth's oceans were placed on the planet Venus, the ocean water would boil into the atmosphere and produce a very dense steam (current surface temperatures on Venus are 900 degrees Fahrenheit with an average sea level pressure of 92,000 millibars, or 92 times that of Earth). Under this amount of enormous heat and pressure (hot enough to melt lead), water vapor would well exceed 4% of the atmosphere by volume. As a note, Venus does not have any significant amounts of water vapor; the atmosphere of Venus is 96% carbon dioxide and 3.5% nitrogen.
SO! Temperature determines the maximum amount of water vapor that can exist in the air. The higher the temperature, the greater the potential percentages of water vapor in the air, up to a maximum of approximately 4%.
Which of the following represents an upright image?
A. -do
B. +m
C. -m
D. +do
Answer:
B. +m
Explanation:
The magnification of an image is defined as the ratio between the size of the image and of the object:
[tex]m = \frac{y'}{y}[/tex]
where we have
y' = size of the image
y = size of the object
There are two possible situations:
- When m is positive, y' has same sign as y: this means that the image image is upright
- When m is negative, y' has opposite sign to y: this means that the image is upside down
Therefore, the correct option representing an upright image is
B. +m
Final answer:
In optics, a positive magnification represents an upright image. Option B: +m represents an upright image.
Explanation:
In optics, an upright image is represented by a positive magnification (+m). When the magnification is positive, it indicates that the image is upright, meaning it has the same orientation as the object.
For the options given, option B: +m represents an upright image.
A positive magnification (+m) indicates that the image is upright. On the other hand, the distance from the object to the mirror or lens (often represented by do or d₁), is concerned with the real versus virtual nature of the image; the sign does not directly indicate the image's orientation. Based on this, the answer which represents an upright image is B. +m.
Which of the following is not a transverse wave?A) soundB) lightC) radioD) all of theseE) none of these
Sound is not a transverse wave; it is a longitudinal wave, with variations in pressure moving in the direction of the wave. Light and radio are electromagnetic and transverse waves, with electric and magnetic fields oscillating perpendicular to the direction of propagation.
Explanation:The question you are asking about waves concerns whether they are transverse waves or longitudinal waves. Transverse waves involve a disturbance that moves perpendicular to the direction of the wave's travel. On the other hand, longitudinal waves involve disturbances that move in the same direction as the wave's travel. In your list, sound waves are the ones that are not transverse; they are longitudinal. Sound waves in air and water are composed of periodic variations in pressure that travel through the fluid medium.
In contrast, light waves and radio waves are types of electromagnetic waves, and they are inherently transverse waves. This means that the electric and magnetic fields oscillate perpendicular to the direction of wave propagation. Therefore, the correct answer to which one is not transverse is sound.
18. A 6.7 kg object moves with a velocity of 8 m/s. What's its kinetic energy? A. 26.8 J B. 167.5 J C. 53.6 J D. 214.4 J
Answer:
Answer is D.
Explanation:
Hope my answer has helped you!
Use the following equation to help you answer the question. The peak intensity of radiation from a star named Sigma is 2 x 10 6 nm. What is the average surface temperature of Sigma rounded to the nearest whole number
To calculate the average surface temperature of the star Sigma, you can use Wien's displacement law, which states that the wavelength of the peak intensity of radiation is inversely proportional to the temperature of the star. Using this equation, the average surface temperature of Sigma is 1 K.
Explanation:To calculate the average surface temperature of the star Sigma, we can use Wien's displacement law. According to the law, the wavelength of the peak intensity of radiation is inversely proportional to the temperature of the star. The equation for the law is:
λmax = b / T
where λmax is the peak wavelength, T is the temperature, and b is Wien's displacement constant (approximately 2.8978 x 10-3 K·m).
In this case, we're given the peak intensity of radiation as 2 x 106 nm. Converting nm to meters:
2 x 106 nm = 2 x 106 x 10-9 m = 2 x 10-3 m
Substituting the values into the equation:
2 x 10-3 m = (2.8978 x 10-3 K·m) / T
Solving for T:
T = (2.8978 x 10-3 K·m) / (2 x 10-3 m)
T = 1.4489 K
Rounding to the nearest whole number, the average surface temperature of Sigma is 1 K.
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Most of the volume of an atom is occupied by the
Which statements best describe energy? Check all that apply. The total amount of energy in the universe remains constant. The total amount of energy in the universe changes constantly. Energy cannot be converted from one form to another. Energy can be converted from one form to another. Energy cannot be created or destroyed. Energy can be created or destroyed.
1) The total amount of energy in the universe remains constant.
4) Energy can be converted from one form to another.
5) Energy cannot be created or destroyed.
Best describes energy
What is law of conservation of energy ?
Law of conservation of energy is the principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant.
Total energy of any system always remains constant . Also from law of conservation of energy it can be stated as energy can neither be created nor be destroyed ,it only transforms form one form to other form .
hence , option 1) : The total amount of energy in the universe remains constant.
4) Energy can be converted from one form to another.
5) Energy cannot be created or destroyed.
Best describes energy
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Answer:
1, 3, 4, 5
Explanation:
took on edge
which image illustrates why dark clothing helps to keep you warm on a cool, sunny day?
Answer:
Explanation:
I suppose it has to do with the way the diagram is drawn. The heat does not reflect which makes both A and B incorrect.
C would have nothing to do with either reflection or refraction.
That only leaves D which is the answer.
The energy equivalent of the rest mass of an electron is
Answer:energy times mass
Explanation: yeh
The height of the empire state building is 318 m if a stone is dropped from the top of the building what is the stones velocity just before it strikes the ground
79 m/s. A stone dropped from the top of the Empire State Building will have a velocity of 79 m/s just before it strikes the ground.
This problem is about free fall, to find the velocity of the stone before it strikes the ground we have to use the equation [tex]v_{f}^{2}=v_{0}^{2}+2gh[/tex], the initial velocity of the stone is 0 m/s. Then:
[tex]v_{f}^{2}=2gh[/tex]
[tex]v_{f}=\sqrt{ 2gh}[/tex]
Solving the equation above with g = 9.8 m/s², and h = 318.0 m:
[tex]v_{f}=\sqrt{ 2(9.8m/s^{2})(318.0m)}= 78.95 m/s[/tex]
[tex]v_{f}[/tex]≅ 79 m/s
Ice is used to cool beverages primarily because
Answer:
E) it absorbs a lot of heat when it melts because of hydrogen bonding
Choices:
A) it is composed only of water
B) it floats
C) it dilutes the taste
D) people like to chew it
E) it absorbs a lot of heat when
Answer:
E) it absorbs a lot of heat when it melts because of hydrogen bonding
Explanation: