Sound waves are not able to travel in a vacuum, sound requires a medium such as air or a solid for example. Satellites are indeed in space, but radio waves are not sound waves they are a form of light. Light can travel in a vacuum so the messages that satellites beam back to Earth are light waves not sound waves, that is why it is possible.
Answer:
Waves that move through matter only are called
mechanical
waves. Waves that move through space are called
electromagnetic
waves.
Explanation:
If the current in a wire increases from 5 A to 10 A, what happens to its magnetic field? If the distance of a charged particle from a wire changes from 10 cm to 20 cm, what happens to its magnetic field? If the charge of a particle changes from 2 µC to –2µC, what happens to the force exerted on that particle?
(1) Doubling of the current through the wire will result in doubling of its magnetic field.
The magnetic field around a wire is a function of the current I and radial distance r
[tex]B = \frac{\mu\cdot I }{2\pi r}[/tex]
(with mu denoting the magnetic permeability of the medium). So, B is directly proportional to I. The field magnitude will double with the doubled current from 5A to 10A
(2) Using the same formula as in (1), we can see that the magnetic field is inversely proportional to the radial distance from the wire. So, a particle at 20cm will experience half the magnitude compared to a particle at 10cm.
(3) Answer
If a particle with a charge q moves through a magnetic field B with velocity v, it will be acted on by the magnetic force
[tex]F_m = B\cdot v\cdot q[/tex]
So, a particle with charge -2uC will experience a magnetic force of same magnitude but opposite direction (and perpendicular to B) as compared to a particle with a charge of 2uC
If the current in a wire increases from 5 A to 10 A, the magnetic field will double.
If the distance of a charged particle from a wire changes from 10 cm to 20 cm, the magnetic field will be halved.
If the charge of a particle changes from 2 µC to –2µC, the magnitude of the force will be the same but the direction will be different
The given parameters:
Current, from 5 A to 10 ADistance of charge, from 10 cm to 20 cmCharge, from 2 µC to –2µCThe magnetic field around a wire is a function of the current I and radial distance r, given as;
[tex]B = \frac{\mu_o I}{2\pi r} [/tex]
Thus, we can conclude the following;
If the current in a wire increases from 5 A to 10 A, the magnetic field will double.If the distance of a charged particle from a wire changes from 10 cm to 20 cm, the magnetic field will be halved.The force exerted on a particle is calculated as follows;
F = qVB
where;
q is the charge'
If the charge of a particle changes from 2 µC to –2µC, the magnitude of the force will be the same but the direction will be different.
Learn more about magnetic field here: https://brainly.com/question/7802337
An antelope trots through the grasslands at a velocity of 2 m/s. Suddenly, a lion begins to chase the antelope. If the antelope accelerates at a rate of 4 m/s2, what is the antelope's final velocity after 7 seconds? Assume that the antelope moves in only one direction. A. -26 m/s B. 26 m/s C. 56 m/s D. 30 m/s
v₀ = initial velocity antelope through the grasslands = 2 m/s
a = acceleration of the antelope = 4 m/s²
t = time for which the antelope accelerate = 7 seconds
v = final velocity of antelope = ?
using the kinematics equation
v = v₀ + a t
inserting the above values in the above equation
v = 2 + (4) (7)
v = 2 + 28
v = 30 m/s
hence the correct choice comes out to be
D. 30 m/s
Final answer:
The antelope's final velocity after accelerating for 7 seconds is calculated using the formula for final velocity, giving a result of 30 m/s. Option D is the correct answer.
Explanation:
To calculate the antelope's final velocity after accelerating for 7 seconds, we use the formula for final velocity v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
In this scenario, the antelope's initial velocity (u) is 2 m/s, its acceleration (a) is 4 m/s2, and the time (t) is 7 seconds. Plugging these values into the formula, we get:
v = 2 m/s + (4 m/s2 × 7 s) = 2 m/s + 28 m/s = 30 m/s.
Therefore, the antelope's final velocity after 7 seconds is 30 m/s, making option D the correct answer.
What is the torque τa about axis a due to the force f⃗ ? express the torque about axis a at cartesian coordinates (0,0)?
The torque about axis a due to the applied force [tex]\vec{F}[/tex] results in a rotational effect is [tex]\tau_a = (-1, 1, 0) \, \text{N·m}.[/tex]
To calculate the torque [tex]\tau_a[/tex] about axis a due to the force [tex]\vec{F}[/tex], we follow certain steps. Torque is a measure of how much a force acting on an object causes that object to rotate. It depends on two main factors: the magnitude of the force and the distance from the pivot point to the line of action of the force (the lever arm).
Identify the Parameters: In this scenario, we have:
Force [tex]\vec{F} = (2i + 2j - 3k) \, \text{N}[/tex]Position vector [tex]\vec{r} = (i + j - k) \, \text{m}[/tex] from the origin to the point of application of the force.Determine the Components: We want to calculate torque about the axis a, which we'll assume is one of the coordinate axes. Let's consider the torque about the z-axis for this example. The relevant components are those that lie in the xy-plane since the z-axis is perpendicular to this plane.
Calculate the Torque Using Cross-Product: The torque [tex]\tau[/tex] about the z-axis can be calculated using the cross product of the position vector [tex]\vec{r}[/tex] and the force vector [tex]\vec{F}[/tex]. The torque is given by:
[tex]\tau = \vec{r} \times \vec{F} = \begin{vmatrix}
\vec{i} & \vec{j} & \vec{k} \\
1 & 1 & -1 \\
2 & 2 & -3
\end{vmatrix}.[/tex]
Calculate the Determinant: To compute this determinant:
[tex]\tau = \vec{i}(1 \cdot (-3) - (-1) \cdot 2) - \vec{j}(1 \cdot (-3) - (-1) \cdot 2) + \vec{k}(1 \cdot 2 - 1 \cdot 2).[/tex]
This results in:
[tex]\tau = \vec{i}(-3 + 2) - \vec{j}(-3 + 2) + \vec{k}(2 - 2)[/tex]
[tex]\tau = \vec{i}(-1) - \vec{j}(-1) + \vec{k}(0) = -\vec{i} + \vec{j}.[/tex]
torque about axis a is:
[tex]\tau_a = -\vec{i} + \vec{j}.[/tex]
Final Expression: In Cartesian coordinates, we can express this torque as:
[tex]\tau_a = (-1, 1, 0) \, \text{N·m}.[/tex]
a balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm^3
a. 100cm^3
b. 1,000,000cm^3
c. 10cm^3
d. 1,000cm^3
Answer:
Volume of head = 1000 cm^3
Explanation:
The head of a normal person can be assumed as a sphere with radius 10 cm.
Volume of sphere[tex]=\frac{4}{3} \pi r^3[/tex], where r is the radius.
We have approximate radius = 10 cm.
Approximate volume of head [tex]=\frac{4}{3}* \pi *10^3=4189 cm^3[/tex]
In the given options the closest value to the approximate volume is 1000 cm^3.
So, volume of head = 1000 cm^3
Select all of the energy types present in the circuit system when the switch is set to "Off."
A. light energy
B. heat energy
C. sound energy
D. electrical energy
E. chemical energy
F. magnetic energy
Question
Select all of the energy types present in the circuit system when the switch is set to "Off."
A. light energy
B. heat energy
C. sound energy
D. electrical energy
E. chemical energy
F. magnetic energy
I have 1 Answer D
Final answer:
In a circuit system when the switch is set to 'Off,' the energy types present are electrical energy (D), chemical energy (E), and magnetic energy (F).
Explanation:
When the switch is set to 'Off' in a circuit system, the energy types present are:
Electrical energy: Even though the switch is off, there is still potential electrical energy in the circuit waiting to be used.Chemical energy: If there are batteries or any other chemical power sources in the circuit, there is still chemical energy stored in them.Magnetic energy: Some components in the circuit, such as inductors, can store magnetic potential energy even when the switch is off.What climate is characterized by constant high temperatures at sea level with an average temperature of 18 °C or higher, and is found near the equator? A) arid B) polar C) tropical D) temperate
Correct answer id option C that is tropical.
Tropical Climate is characterized by constant high temperature at sea level with an average temperature of 18°C or higher and is found near the equator.
Areas with tropical climate have high humidity and temperature. Countries in tropical region have high precipitation rate. Tropical climate is also known as equatorial climate. Tropical regions are found near equator. Due to high convection rate, there is abundant rainfall.
Answer:
c. tropical
Explanation:
Tropical Climate is characterized by constant high temperature at sea level with an average temperature of 18°C or higher and is found near the equator.
Areas with tropical climate have high humidity and temperature. Countries in tropical region have high precipitation rate. Tropical climate is also known as equatorial climate. Tropical regions are found near equator. Due to high convection rate, there is abundant rainfall.
Through how many volts of potential difference must an electron be accelerated to achieve a wavelength of 0.57 nm ?
Chemists measure energy in units of _________ because it is based on heating water. Since most chemical reactions are doing in water or surrounded by water, this is an easy way to measure the energy change during a reaction.
A work
B Joule
C Calorie
D Horsepower
The answer is; C
A calorie is a unit of energy used to describe the energy required to raise the temperature of one gram of water by one degree at an ambient pressure of 1 atmosphere. This SI unit has gained popularity in its use in nutrition where the energy in a particular type of food (carbohydrates, proteins, and fats) is measured in calories.
The calculation of kinetic energy uses the formula, KE = 1 2 mv2. Identify the unit that is required for mass and velocity, respectively, to determine the kinetic energy in Joules. A) mass in g, velocity in m s B) mass in kg, velocity in m s C) mass in g, velocity in km hr D) mass in kg, velocity in km hr
So the answer is B. because the mass have Kg as a international unit and velocity is m/s, they are international units in physics.
Answer:
Mass : kg
Velocity : m/s
Explanation:
Kinetic energy is due to the motion of an object. The mathematical expression for the kinetic energy is given by :
[tex]E_k=\dfrac{1}{2}mv^2[/tex]
Where
m is the mass of the object
v is the velocity of object
The SI unit of kinetic energy is joule (J). One joule equals :
[tex]E_k=\dfrac{1}{2}\times kg\times m/s=Joule[/tex]
Every physical quantity must be in SI units So, mass must be in kilogram (kg) and velocity must be in meter/second (m/s).
A 98 kilogram man is accelerating forward at a rate of 1.2 m/s2. What is the unbalanced force necessary to produce the movement? A) 81.67 N B) 96.8 N C) 99.2 N D) 117.6 N
The correct answer is D) 117.6 N
Use the formula F = ma, F = (98)(1.2) = 117.6 N.
please give me the brainliest
Final answer:
The unbalanced force required to produce the movement of a 98 kg man accelerating at 1.2 m/s² is calculated using Newton's second law of motion (F=ma), which results in a force of 117.6 N. So the correct option is D.
Explanation:
To determine the unbalanced force necessary to produce the movement of a 98 kilogram man accelerating forward at a rate of 1.2 m/s², we can use Newton's second law of motion, which states that force equals mass times acceleration (F = ma).
Given:
- Mass (m) = 98 kg
- Acceleration (a) = 1.2 m/s²
Force (F) = m × a
Force (F) = 98 kg × 1.2 m/s²
Force (F) = 117.6 N
Therefore, the correct answer is D) 117.6 N.
All living things are made up of cells. Some organisms, such as bacteria, exist only as single-celled organisms. Others, consist of countless cells all working together to form a single living being. Humans are comprised of trillions of cells that are organized into tissues such as muscle and skin or organs like the liver and lungs. Every organic life form starts from a single cell. Cells form a tissue, tissues form an organ and organs form the human body. These cell divisions by which a single cell divides a hundred trillion times is a process called growth. It is a unique and very complex process that happens in the body. A normal cell follows a uniform life cycle and reproduction. The abnormal (mutant) cells are cancer cells. Cancer cells happens when a certain cell (DNA) gets a different signal that causes mutation. When a cell senses a mistake, the system eliminates (self destructs) itself from the body, however, there are some instances that a cell’s mutation is left undetected. These cells reproduce and grow in a manner that is not even or regular in pattern or movement; hence, the growth of the cancers cells. Cancer cells vary from normal cells. They have different characteristics that allowed researchers to understand cell mutation extensively.
All normal cells carry characteristics that are essential to perform a normal bodily function. These cells differ in shape and size but they are uniformed depending on what type of cells they are. All human cells are eukaryotic (any organism having as it fundamental structural unit a cell type that contains specialized organelles in the cytoplasm, a membrane-bound nucleus enclosing genetic material organized into chromosomes, and an elaborate system of division by mitosis or meiosis, characteristic of all life forms except bacteria, blue-green algae, and other primitive microorganisms) because they contain a true nucleus that can hold genetic information, like DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). These genes are responsible for all cellular activities and functioning. Healthy cells divide in an orderly manner to produce more cells only when the body needs them. They follow the lifecycle which includes mitosis (the usual method of cell division, characterized typically by the resolving of the chromatin of the nucleus into a threadlike form, which condenses into chromosomes, each of which separates longitudinally into two parts, one part of each chromosome being retained in each of two new cells resulting from the original cell), meiosis (part of the process of gamete formation, consisting of chromosome conjugation and two cell divisions, in the course of which the diploid chromosome number becomes reduced to the haploid), and apoptosis ( the death of a cell).
Is this like a helping thing. If it is thanks so much. I appreciate your time and work. Is this a question?
The pitch made by a musical instrument is dependent on the frequency of the wave. Frequency is the inverse of period. What impact do you think the frequency of a wave has on the wave speed?
I think the frequency of the wave has no effect whatsoever on the wave speed. The speed of a wave completely depends on the characteristics of the medium it's traveling through.
Physical properties of the medium determine the speed of mechanical waves, like sound, ocean waves, seismic waves, Slinky waves etc. If it depended on the frequency of the waves, then the sound of the band or orchestra would be all smeared out when it reaches you ... you'd hear the drums and bass first, and the flutes and trumpets last.
Electrical properties of the medium determine the speed of electromagnetic waves, like radio, light, and X-rays. If it depended on the frequency of the waves, then you couldn't watch a football game in the stadium or on TV. The reds, oranges, and yellows would reach your eyes first, and then the greens, blues, and violets would arrive later. The action would be all smeared out, and things that happened first might reach your eyes last. What a mess !
Answer:
it has no affect at all .. doesnt change
Explanation:
Which quality is desirable for a radioisotope that is used for medical imaging of a specific organ? Check all that apply. half-life of several years half-life of several days half-life of several seconds emission of gamma rays emission of alpha particles ability to be attached to a compound used by the body ability to pass through the body without being absorbed
Answer:
- Half-life of several days
- Emission of gamma rays
- Ability to be attached to a compound used by the body
Or
2,4,6
Explanation: Those are the answers on Edgnuity,
The quality which are desirable for a radioisotope that is used for medical imaging of a specific organ is Half-life of several days, Emission of gamma rays, Ability to be attached to a compound used by the body.
What is Radioisotopes ?a chemical element in an unstable state that emits radiation as it decomposes and becomes more stable. Radioisotopes can be created in a lab or in the natural world. They are utilised in imaging studies and therapy in medicine. likewise known as radionuclide.
In nuclear reactors, cyclotrons, particle accelerators, or radionuclide generators, radionuclides can be generated artificially or naturally. About 730 radionuclides (see list of nuclides) have half-lives that are greater than 60 minutes. Of those, 32 are primordial radionuclides, which were produced prior to the formation of the earth. There are at least 60 more radionuclides that may be found in nature, either as offspring of the original radionuclides or as radionuclides created naturally on Earth by cosmic radiation. Half-lives of more than 2400 radionuclides are shorter than 60 minutes.
To know more about Radioisotopes :
https://brainly.com/question/13076859
#SPJ3.
What happens to rocks as water combines
with gases in the air to form acids?
A. The acid dissolves or alters the chemical
composition of the rock.
B. The acid solidifies any loose rock particles,
which makes the rock denser.
C. The acid forms a protective coating on
rocks, making it difficult for them to
weather.
D. The acid creates cracks in the rocks, which
allow air to circulate through the rock,
causing it to weather
The combination of water and gases in the air forming acids leads to the chemical weathering of rocks, where acids dissolve or alter the chemical composition of the rocks, following option A.
When water combines with gases in the air to form acids, the chemical composition of rocks can be significantly altered. Acid rain, which is a byproduct of industrial pollutants mixing with atmospheric moisture, leads to increased chemical weathering of rocks. This weathering is a process where the minerals in rocks react with the acids and experience changes such as oxidation or dissolving.
Carbon dioxide (CO₂) naturally reacts with rainwater to form carbonic acid, which is a weaker form of acid that also contributes to the weathering of rocks by dissolving them over time.
However, pollutants from burning fossil fuels add gases like nitrous oxide and sulfur dioxide to the atmosphere, which combine with rainwater to form more potent acids such as nitric and sulfuric acids, enhancing the weathering process. These acids do not solidify rock particles, form protective coatings, or create cracks for air circulation but instead actively dissolve or alter the rocks' chemical makeup, which aligns with option A.
Need Help ASAP!
Which of the following places would have the most "continentality"?
A.) Los Angeles, California
B.) San Fransisco, California
C.) Denver, Colorado
D.) New York, New York
Continentality: Continentality, a measure of the difference between continental and marine climates characterized by the increased range of temperatures that occurs over land compared with water.
I'm not sure but I think the most reasonable would be C or B but again im not sure.
Final answer:
Denver, Colorado has the most continentality, as it is located away from the ocean and at a higher altitude, which leads to greater temperature ranges and a Type D climate.
Explanation:
The concept of continentality relates to the climate characteristics of an area, especially the range of temperatures, and is connected to how far an area is from the influence of the sea. Factors that influence continentality include proximity to large bodies of water and latitude. Based on these factors, Denver, Colorado would have the most continentality among the options given. Los Angeles and San Francisco have moderate Type C climates with oceanic influence that reduces temperature extremes. New York experiences some continentality but is still influenced by the Atlantic Ocean. In contrast, Denver is far from any large body of water and is located at a higher altitude in the interior of the continent, resulting in greater temperature ranges and a more pronounced Type D (cold or continental) climate.
a sprinter starts from rest and accelerates at 1.5 m/s2 fro 20 meters. What is his final velocity?show work please
We can determine the final velocity via the following kinematic equation:
[tex]v_{final}^2=v_{initial}^2+2a \Delta x[/tex]
Since the sprinter starts at rest this means the initial velocity is zero, a = 1.5 m/s^2 and the difference of x is 20 meters therefore:
[tex]v_{final}^2=0^2+2(1.5m/s^2)(20)\\\\v_{final}^2=60\\\\v_{final}=\sqrt{60}\\v_{final} \approx 7.75 m/s[/tex]
The final velocity is 7.75 m/s
How is science different from other subjects that involve thought, such as art, philosophy, and religion?
A.
Science is more objective, since it is predominantly based on evidence.
B.
Science is more subjective, since theories are based on opinions.
C.
Science has a tendency to be heavily influenced by society.
D.
Science requires more faith rather than logic and reason.
Answer:
A.
Explanation:
I did the Quiz and got it correct. Hope it helps!!!!
A hippogriff is a large flying creature that Hagrid watches over at Hogwarts. If the Hippogriff’s mass is 1200 kg then what is its weight? (Remember that the acceleration of gravity is -9.8 m/s2.) USE THE FORMULA: w=m∙g Show all your work!
Answer: 11760 N
Weight = Mass × Acceleration = Mass × Gravity
Mass = 1200kg
Gravity = 9.8 m/s^2 (the negative sign denotes direction)
Weight = 1200kg × 9.8 m/s^2 = 11760 kg×m/s^2 = 11760 Newtons
To calculate the weight of a Hippogriff with a mass of 1200 kg, we use the formula w = mg, where m is mass and g is the acceleration due to gravity, 9.8 m/s², resulting in a weight of 11,760 N.
Explanation:The question asks for the weight of a Hippogriff at Hogwarts, given its mass is 1200 kg and considering the acceleration due to gravity is 9.8 m/s2. To find the weight, we use the formula w = mg, where m is the mass of the Hippogriff and g is the acceleration due to gravity.
Plugging in the given values, we get:
w = (1200 kg)(9.8 m/s2)
Therefore, the weight of the Hippogriff is 11,760 N (Newtons).
The acceleration due to gravity is a constant on Earth, which is about 9.80 m/s2. This value is a critical component in calculating the weight of any object, including mythical creatures in imaginative contexts like Hogwarts. Remember, while mass is a measure of how much 'stuff' there is, weight measures the force of gravity on that 'stuff'.
A baseball is thrown vertically upward with an initial velocity of 30.0 m/s. The maximum height gained by the ball is?
Answer:
45.9 m
Explanation:
We can solve the problem by using the law of conservation of energy. In fact, the mechanical energy (sum of gravitational potential energy and kinetic energy) of the ball just after it is thrown is equal to the mechanical energy of the ball when it is at the top of its trajectory:
[tex]E_i = E_f\\U_i + K_i = U_f + K_f[/tex]
where
[tex]U_i = 0[/tex] is the initial gravitational potential energy of the ball, which is zero because the ball starts its motion from the ground (h=0)
[tex]K_i = \frac{1}{2}mv^2[/tex] is the initial kinetic energy of the ball, where m is the mass of the ball and v=30.0 m/s is its speed
[tex]U_f = mgh[/tex] is the gravitational potential energy of the ball at its maximum height h
[tex]K_f = 0[/tex] is the kinetic energy of the ball when it is at the maximum height (it is zero because the speed of the ball at its maximum height is zero)
Substituting into the first equation, we can find h:
[tex]\frac{1}{2}mv^2 = mgh\\h=\frac{v^2}{2g}=\frac{(30.0 m/s)^2}{2(9.8 m/s^2)}=45.9 m[/tex]
How much power is required to raise a 100 kg crate a vertical distance of 2 m in a time of 4 s? A. 200 W B. 500 W C. 800 W D. 2000 W
PLEASE HELP
Power = (work done) / (time to do the work)
Work done = (force) x (distance)
Force = (weight of the crate) = (mass of the crate) x (gravity)
Crate weight = (100 kg) x (9.8 m/s²)
Force = 980 Newtons
Work done = (980 N) x (2 m) = 1,960 Joules
Power = (1,960 Joules) / (4 seconds)
Power = 490 Joules per second
(Whoever wrote the question used 10 m/s² for gravity instead of 9.8 m/s², so his answer came out to be 500 W. That's choice-B .)
Power = 490 watts
To calculate the power required to lift an object we use the formula for power which is work/time. In order to find the work done we use the formula work = mass * gravity * height. In this case the power required to lift the 100 kg crate a vertical distance of 2m in 4s is 490 W.
Explanation:The scientific concept this question is referring to is power, which in the realm of physics, is the amount of work done (or energy transferred) per unit time. The formula for power is work/time, and work can be calculated by multiplying force and distance. In this case, the force would be equivalent to the weight of the crate, calculated by multiplying its mass by gravity (9.8 m/s^2).
So, first, we calculate the work done in lifting the crate to a height of 2m using the formula m*g*h where m = 100kg, g = 9.8 m/s^2 and h = 2m.
Work = 100kg * 9.8m/s^2 * 2m = 1960 Joules
Then we calculate the power used using the formula work/time which becomes 1960 J / 4 s = 490 W. Hence, the power required to lift the crate is 490 W which isn't an option in the choices provided in the question. There might be a mistake in the question or in the provided choices.
Learn more about Power Calculation here:https://brainly.com/question/33381197
#SPJ3
Two plumbers are working at a site. The first tries to unscrew a pipe with a wrench and cannot budge it. The second one is twice as strong as the first one. He also has a wrench that is twice as long. How much more torque can the second plumber exert compared to the first?
Answer: The second plumber can exert 4 times more torque than the first one.
Explanation:
Torque is the cross product of force which causes rotation and the distance from the axis of rotation at which the force is applied.
τ = F × r
For the first plumber,
τ₁ = F₁ × r₁
For the second plumber,
τ₂ = F₂ × r₂ = 2 F₁ × 2 r₁ = 4 F₁ × r₁ = 4 τ₁ (∵ second plumber is twice as strong as first and second wrench is twice the length of first)
⇒τ₂ = 4 τ₁
Which factor makes the mesosphere difficult to study? It is too high for weather balloons It is too high for satellites to observe Cloud cover makes it too hard to see The ozone layer blocks our view
SCIENCE
Answer:
It is too high for weather balloons
Explanation:
he moon has a mass of 7.35 E 22 kg and is located 3.84 E 8 meters from the earth. Ellen, an earthling, has a mass of 47 kg. Does the moon attract Ellen with a force that is greater than, less than, or the same as, the force with which Ellen attracts the moon? Explain your answer.
Answer: The force with which moon attracts Ellen is same as the force with which Ellen attracts Moon.
Explanation:
Gravitational force is attractive in nature. Any two bodies having mass pull each other with a force proportional to their masses and inversely proportional to square of distance between them.
[tex]F= G \frac {Mm}{d^2}[/tex]
where G is the gravitational constant.
Force with which Ellen and Moon pull each other:
[tex]F = 6.67 \times 10^{-11} N m^2/kg^2\times \frac{7.35 \times 10^{22} \times 47 kg}{(3.84 \times 10^8 m)^2} = 1.56\times 10^{-3} N[/tex]
From Newton's third law, every action has an equal and opposite reaction. The action-reaction pair act on different bodies.
Hence, the force with which moon attracts Ellen is equal to the force with which Ellen attracts Moon.
How do astronomers best learn about distant objects in the universe
A. They collect and analyze data from their electromagnetic radiation.
B. They analyze rock samples from space probes.
C. They study nearby objects and match their properties with those of distant objects.
They collect and analyze data from the objects' electromagnetic radiation.
What is the wavelength of infrared in scientific notation?
Answer:
[tex]7.00 \cdot 10^{-7} m - 1\cdot 10^{-3} m[/tex]
Explanation:
Infrared radiation has wavelength in the range between 700 nm and 1 mm. Lets' convert these values into scientific notation, keeping in mind that:
[tex]1 nm = 10^{-9} m\\1 mm = 10^{-3} m[/tex]
Let's start from the lower value, we have:
[tex]700 nm = 700 \cdot 10^{-9} m = 7.00 \cdot 10^{-7} m[/tex] (we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)
The higher value is:
[tex]1 mm = 1 \cdot 10^{-3} m[/tex]
So, the range of wavelength of infrared radiation is:
[tex]7.00 \cdot 10^{-7} m - 1\cdot 10^{-3} m[/tex]
A 8 kilogram cat is resting on top of a bookshelf that is 2 meters high. What is the cat’s gravitational potential energy relative to the floor?
-ZERO- No 17.6 pound Earth-bound cat is going to be able to jump to the top of a 6 feet 7 inch bookshelf unassisted! Someone should call the SPCA on the writer of this textbook question ;-)
Assuming that this overweight cat is content being placed in such a lofty position, your professor probably wants the answer of 156.8 Joules
Mass x Acceleration of Gravity (on Earth) x elevation = Potential Energy
8 Kg x 9.8 m/s2 x 2 m = 156.8 J
During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the top of the science building. Determine distance the ball has traveled after falling for 1.0 second, ignoring air resistance and given the gravitational acceleration of 9.8 m/sec2. A) 4.9 m B) 11 m C) 20 m D) 32 m
Given that,
mass of ball , m =11 lbs
Time , t = 1.0 seconds
Acceleration , a = 9.8 m/s²
Distance , s = ?
Since, we know that,
S = Vi *t + 1/2 at²
Since initial velocity is zero in this case (ball was at state of rest before falling to the ground)
S = 1/2 *9.8 * (1)²
S = 4.9 m
The distance covered by ball after one second will be 4.9 m.
A satellite of mass m is moving in a circular orbit around the earth at a constant speed v and at an altitude h above the earth's surface.a. find the speed of a satellite orbiting the earth 1000 km above its surface.the radius of the earth rearth = 6371 km is and its mass is mearth = 5.98x1024 kg .
Final answer:
To find the speed of a satellite orbiting the Earth 1000 km above its surface, you can use the formula for orbital speed, v = √(GM/r), where G is the gravitational constant, M is the mass of the Earth, and r is the radius of the orbit.
Explanation:
To find the speed of a satellite orbiting the Earth 1000 km above its surface, we can use the formula for orbital speed. The orbital speed is given by the equation v = √(GM/r), where G is the gravitational constant, M is the mass of the Earth, and r is the radius of the orbit. In this case, the radius of the orbit is the sum of the radius of the Earth and the altitude above the surface.
Plugging in the values, we have v = √((6.67430 × 10^-11)(5.98 × 10^14)/((6371000 + 1000000) × 10^3)). Evaluating this expression gives us the speed of the satellite orbiting the Earth 1000 km above its surface.
A drag racer starts from rest and accelerates at 7.4 m/s2. How far will he travel in 2.0 seconds?
Try this solution:
1. rule for this type of movement:
[tex]S=v_0t+\frac{at^2}{2}, \ where \ a-acceleration,S-distance,v-startSpeed,t-time.[/tex]
2. according to the rule described above:
[tex]S=0+\frac{7.4*2^2}{2}=7.4*2=14.8(m)[/tex]
answer: 14.8 meters.
A drag racer starts from rest and accelerates at 7.4 m/s2. How far will he travel in 2.0 seconds?
Using the kinematic equation below we can determine the distance traveled if t=2, a=7.4m/s^2. First we must determine the final velocity:
[tex]v_{final}=v_{initial}+\frac{1}{2}at\\\\v_{final}=0+(7.4m/s^2)(2s)=34.8m/s[/tex]
Now we will determine the distance traveled:
[tex]v_{final}^2=v_{initial}^2+2a \Delta x\\\\\Delta x = \frac{v_{final}^2}{2a} =\frac{(34.8)^2}{(2)(7.4)}=81.83 m[/tex]
Therefore, the drag racer traveled 81.83 meters in 2 seconds.
We have that When A drag racer starts from rest and accelerates at 7.4 m/s the distance travelled in 2.0 seconds is
S=14.8m
From the question we are told
A drag racer starts from rest and accelerates at 7.4 m/s2. How far will he travel in 2.0 seconds?
Generally the equation for the Distance is mathematically given as
[tex]s=ut+1/2at^2\\\\Where\\\\Accelerates at 7.4 m/s2\\\\U=0\\\\T=2.0\\\\[/tex]
Hence
S=0+1/2(7.4)(2)^2
S=14.8m
Therefore
When A drag racer starts from rest and accelerates at 7.4 m/s the distance travelled in 2.0 seconds is
S=14.8m
For more information on this
https://brainly.com/question/23379286