When a car goes around a corner at 20 mph, (D) it is accelerating because it's changing direction. The direction of the velocity which is a vector is changing so the it accelerates.
What is acceleration?An acceleration is a rate of change in velocity of an object with respect to time. It can be expressed as
a = Δv/Δt
Where
a = accelerationΔv = change in velocityΔt = change in timeA car goes around a corner at 20 mph. Find the reason why it is accelerates!
We know that an object accelerates when it has a change in velocity. The magnitude of the velocity of the car doesn't change, but the direction does.
A velocity is a vector which has both magnitude and direction. While the direction of the car is changing around a corner, the velocity also changes. Hence, with a change in velocity, we say car is accelerating.
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What is the acceleration of gravity on Venus?
Answer:
8.87 m/s^2
Explanation:
When you whirl a cancan at the end of a string in a circular path, what is the direction of the force you exert on the cancan?
While whirling a can (or any object attached to a string) in a circular path, the direction of the force exerted on the can is toward the centre of circular path. This force is called the centripetal force.
What is a Centripetal Force?
Centripetal force is a force that acts on an object moving in a circular path and is directed toward the centre of the circle. It is what keeps the object moving in a circular path and prevents it from flying off in a straight line.
The magnitude of the centripetal force is proportional to the mass of the object, it's velocity, and the radius of the circular path. It can be calculated using the equation[tex]F = mv^2/r[/tex], where F is the centripetal force, m is the mass of the object, v is its velocity, and r is the radius of the circular path.
For example, while going around a curve in a car, the friction between the tires and the road provides the necessary centripetal force to keep the car moving in a circular path. Another example is a planet moving in orbit around the sun, where the gravitational force of the sun acts as the centripetal force.
In the case of a can attached to a string, the centripetal force is provided by the tension in the string. The string provides the necessary inward force to keep the can moving in a circular path, and the tension in the string is proportional to the centripetal force.
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Suppose a 0. 5-kg mass on a spring that has been compressed 0. 1 m has elastic potential energy of 1. 2 j. What is the spring constant?.
The spring constant in this case is 240 N/m.
What is spring constant?
Springs are pliable mechanical devices that regain their previous shape after deforming, i.e. after being stretched or compressed. The well-known metal coil has evolved into an essential element in the modern world, appearing in everything from engines to appliances to tools to automobiles to medical equipment and even basic ball-point pens. The spring's ability to store mechanical energy accounts for its widespread use and applications. Its reactive spring force produces mechanical energy.Elastic potential energy stored in the spring is E = 1.20 J.
Compression in the spring is x = 0.1 m.
Let the spring constant be k.
From the expression of potential energy stored in the spring we have
E= ½ kx²
1.2 = ½ k × (0.1)² =240 N/m
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What is 73 °F in °C? -
Temperature of 73 °F is equivalent to 22.78 °C.
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.
Temperature conversion is a specific process of converting a given temperature from one temperature scale to another. In this case, we are converting from Fahrenheit (°F) to Celsius (°C).
The formula to convert from Fahrenheit to Celsius is:
°C = (°F - 32) × 5/9
Using this formula, we can convert 73 °F to °C:
°C = (73 - 32) × 5/9
°C = 41 × 5/9
°C = 22.78
So, 73 °F is equivalent to 22.78 °C.
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assume that c is a variable that has assigned a string value. write an expression whose value is true if and only if c is a newline character.A. isQuadrilateral=numberOfSides== 4B. c == '\n'C. c=="\t"D. c == "
Only if the character c is a newline. Quadrilateral=numberOfSides for A. c == '\n' The comparison operator "c == 'n'" determines whether the value of the variable “c” equals the newline character "n."
What purpose of the expression “c == '\n'"?A newline character, which is a control character in programming languages, signifies the end of one line of text and the start of a new one. The ASCII character code 10 or the escape sequence "n" serves as its representation.
The comparison “c == '\n'" is evaluated as follows:
The value of the variable “c” is retrieved.
The character '\n' is created as a constant.
The values of “c” and '\n' are compared.
If they are equal, the result of the comparison is true; otherwise, it is false.
In conclusion, this phrase can be used to programmatically determine whether a variable has a newline character, which is helpful for text manipulation and parsing.
Therefore, If the value of "c" is a newline character, the phrase "c == 'n'" will only be true. The formula evaluates to false if the character "c" is any other character.
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At what distance from the surface of the sphere is the electron's speed half of its initial value?.
The electron's speed is measured in terms of the distance from the sphere's surface as -3.6 x 1028J.
The purpose of distance calculationWe can find out an object's actual size by knowing how far away it is. The area an object occupies in space above us can be measured. Once we know how far away it is, we can calculate its true size.
How would you define distance in plain English?Distance is an object's ultimate motion in an uninspired fashion. Regardless of the initial or concluding point, travel can be referred to as the amount of space an object having spanned.
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The posted rates for cab fare are $4 plus $1 per mile. How many miles can a passenger travel in the cab for $15?.
If the posted rates for cab fare are $4 plus $1 per mile, then the passenger can travel 11 miles in the cab for $15.
The given data is as follows:
The general fare rate of the cab is $4
The cost per each mile is $1
Total remaining cash available = $15
let us assume that n is the number of miles that passenger travel in the cab
From the above-given information, we can write the equation as follows:
Total money = Cost of fare + cost per mile
$15 = $4 + $1(n)
1(n) = 15-4
n = 11/1
n = 11 miles.
Therefore, we can conclude that the passenger can travel 11 miles in the cab for $15.
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When resonance occurs, there is a dramatic decrease in the
amplitude of a sound wave?
True
O False
The given statement that when resonance occurs, there is a dramatic decrease in the amplitude of a sound wave is false.
How does resonance affect the amplitude of a sound wave?Resonance happens when a sound wave's frequency coincides with an object's inherent frequency, increasing the sound wave's amplitude.
Standing waves may develop in the tube as a result of resonance, which amplifies the vibrations' amplitude. The resonant frequencies depend on how long the air column is. The resonating air column amplifies solely the natural frequencies, as opposed to the mouth or reed which produce a combination of diverse frequencies.
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Which of the following shows a change in velocity? Group of answer choices Wendy is riding her bike in a circle in the parking lot. Amber is sitting on a park bench. Ken is driving on Interstate 4 at 65 mph. Jessica is walking her dog along Chestnut Avenue.
Wendy riding her bike in a circle in the parking lot is a change in direction, but her speed is constant, so her velocity is not changing. Amber sitting on a park bench and Jessica walking her dog along Chestnut Avenue are both stationary, so there is no change in velocity.
What is Velocity?
It is defined as the change in position of an object over a unit of time, usually measured in meters per second (m/s) or kilometers per hour (km/h), in a specific direction.
In physics, velocity is distinguished from speed, which is the magnitude of an object's velocity but without regard to its direction. Velocity is a more precise term than speed because it includes both magnitude and direction. For example, a car traveling at 60 km/h east has a different velocity than a car traveling at 60 km/h west.
Velocity is a fundamental concept in many areas of physics, including mechanics, thermodynamics, and electromagnetism. It is used to describe the motion of objects ranging from subatomic particles to celestial bodies in the universe.
The only option that shows a change in velocity is Ken driving on Interstate 4 at 65 mph. This is because velocity is a vector quantity that includes both speed and direction. As Ken is driving, he is changing his direction or speed, or both, which means his velocity is changing.
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A cardiac defibrillator can be modeled as a parallel plate capacitor. When it is charged to a voltage of 2 kV, it has a stored energy of 1 kJ. What is the capacitance of the defibrillator?A2.5×10−4 FB5×10−4 FC2.5×10−1 FD5×10−1 FE1.0 F
A cardiac defibrillator can be modeled as a parallel plate capacitor, Capacitance of the defibrillator is 1 F. Hence, the correct option is (E).
The energy stored in a capacitor is given by the equation:
E = 1/2 * C * V^2
where E is the energy in joules, C is the capacitance in farads, and V is the voltage across the capacitor in volts.
We are given that the defibrillator has a stored energy of 1 kJ (1000 J) when charged to a voltage of 2 kV. Substituting these values into the equation, we get:
1000 J = 1/2 * C * (2 kV)^2
Simplifying this equation, we get:
C = 1000 J / (1/2 * (2 kV)^2) = 1 F
Therefore, the capacitance of the defibrillator is 1 F.
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can somebody help with solving this )
Answer:
59.8amperes
Explanation:
firstly calculate for resistance in the series connection by adding up the two resistors in series to get 15ohms
secondly calculate for the total resistance by adding up the the resistors in parallel together
thirdly you solve for current using the formula I=V/R
What is 25 degrees celsius ?
Answer:
77 degrees fahrenheit
Explanation:
Correct me if im wrong
how did the solar system form
The formation of the solar system was a complex and dynamic process that took place over millions of years.
It is believed that a nearby supernova explosion or shock wave triggered the collapse of this cloud, causing it to contract and spin faster. As it spun, the cloud flattened into a disk with a dense center, which eventually formed the Sun.
As the disk continued to spin, it began to cool and dust particles started to clump together, forming small grains. These grains collided and stuck together, gradually growing larger and forming planetesimals.
The inner planets, including Mercury, Venus, Earth, and Mars, formed from materials that were more heat-resistant, such as rocks and metals. The outer planets, including Jupiter, Saturn, Uranus, and Neptune, formed from materials that were more volatile, such as ices and gases.
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what is the second messenger in the g protein-coupled protein kinase pathway stimulated by epinephrine in liver cells?
The second messenger in the G protein-coupled protein kinase pathway stimulated by epinephrine in liver cells is cyclic AMP (cAMP).
The G protein-coupled protein kinase pathway is a signaling pathway that is stimulated by epinephrine in liver cells.
When epinephrine binds to its receptor on the cell membrane, it activates a G-protein, which in turn activates adenylyl cyclase.
This enzyme then produces cyclic AMP (cAMP), which is the second messenger in this pathway. cAMP binds to and activates protein kinase A, which then phosphorylates proteins in the cell to initiate a response.
This response can be the activation of certain enzymes, the inhibition of other enzymes, or the modification of gene expression.
cAMP is a key signaling molecule that is involved in many biological processes and is essential for the proper functioning of liver cells.
Without cAMP, cells would be unable to respond to epinephrine, and the G protein-coupled protein kinase pathway would not be activated.
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Health-related physical fitness is defined as fitness related to some aspect of health. This type of physical fitness is primarily influenced by an individual's exercise habits; thus, it is a dynamic state and may change. Physical characteristics that constitute health-related physical fitness include strength and endurance of skeletal muscles, joint flexibility, body composition, and cardiorespiratory endurance. All these attributes change in response to appropriate physical conditioning programs, and all are related to health.
Health-related physical fitness is important for overall health and well-being. Health-related physical fitness can help improve an individual's quality of life and reduce their risk for certain diseases.
What is the quality ?The quality of something is its level of excellence. It is a measure of how good something is compared to other things of the same type, and it is usually judged by an expert or by public opinion. Quality is subjective and can be difficult to define. Generally, it is determined by the degree to which something meets its intended purpose, is aesthetically pleasing, or is unlikely to cause harm. Quality is also determined by the level of craftsmanship, materials, and effort that goes into creating something, as well as the amount of care that is taken to ensure that it meets the highest standards. Quality is important as it can affect a product or service's success and it can also impact a person's satisfaction with a purchase.
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A biker has a PE of 360 J at the top of a hill. On the way down the hill, she lost 150 J to heat.
What is her KE at the bottom of the hill?
(Show work please)
The biker's kinetic energy at the bottom of the hill is 210 J.
What is the kinetic energy of the biker?The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.
So, as the biker travels down the hill, her potential energy (PE) transforms into kinetic energy (KE).
At the top of the hill, her PE is 360 J, and she loses 150 J to heat,
so her remaining energy is 360 J - 150 J = 210 J.
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A battery management systems primary purpose is to ___.
A battery management systems primary purpose is to protect the cells from being operated in unsafe conditions.
The BMS's main objective is to safeguard the cells from hazardous operating situations. The BMS can also be used to monitor any battery irregularities and report status (such as battery life) to the user and/or powered (host) device. A battery pack, which is an assembly of battery cells electrically organized in a row by column matrix configuration, is under the control of a battery management system (BMS).
BMS is a piece of technology designed to deliver a targeted range of voltage and current for a period of time against anticipated load scenarios. With the maximum energy density, lithium-ion rechargeable cells are the appropriate option for battery packs in a wide range of consumer goods, from laptops to electric automobiles.
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Compared to visible radiation, does infrared radiation have longer or shorter wavelengths and higher or lower energy per photon?
Infrared radiation has longer wavelengths compared to visible radiation, and lower energy per photon.
What are infrared radiation?Infrared radiation (IR) is a type of electromagnetic radiation that is not visible to the human eye. It has a longer wavelength and lower frequency than visible light, and it is part of the electromagnetic spectrum that also includes radio waves, microwaves, visible light, ultraviolet radiation, X-rays, and gamma rays.
Infrared radiation is often associated with thermal radiation, which is the emission of electromagnetic waves from objects that are at a temperature above absolute zero. This is because infrared radiation is often emitted by objects that are warm, and it is this type of infrared radiation that is responsible for our ability to feel heat.
Infrared radiation has a wide range of applications, including in remote sensing, thermal imaging, and heating. For example, in remote sensing, infrared radiation can be used to observe and study the Earth and other celestial objects, as well as to detect and monitor changes in temperature, vegetation, and other physical properties. In thermal imaging, infrared cameras are used to detect heat signatures and create images based on temperature differences. In heating, infrared heaters use infrared radiation to heat objects and materials directly, rather than heating the air around them.
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An astronaut who fell into a black hole would be stretched be-causea. the gravity is so strong.b. the gravity changes dramatically over a short distance.c. time is slower near the event horizon.d. black holes rotate rapidly, dragging spacetime with them.
The correct option is B, An Astronaut who fell into a black hole would be stretched because the gravity changes dramatically over a short distance.
A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape. It is created when a massive star runs out of fuel and collapses under its own gravity. The intense gravity warps space and time, creating a point of singularity where all matter is compressed into an infinitely small, dense point.
The boundary around the black hole where the gravitational pull is so strong that even light cannot escape is called the event horizon. Anything that crosses this boundary is said to be swallowed by the black hole, never to be seen again. The study of black holes has led to new insights into the nature of space, time, and gravity, and has opened up new avenues of research in astrophysics and cosmology.
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a satellite moves in a circular orbit around the earth at a speed of 6.6 km/s. determine the satellite's altitude above the surface of the earth, Assume the earth is a homogeneous sphere of radius 6370 km and mass 5.98x10^24 kg. The value of the universal gravitational constant is 6.67259x10^-11 N x m^2/kg^2.
The altitude of the satellite above the surface of the Earth is 1,528.48 km. The given parameters; are the speed of the satellite, v = 6.9 km/s. the radius of the Earth, R = 6370 km.
What is the radius?A radius is a measure of distance from the centre of any circular object to its outermost edge or boundary. A radius is not only a dimension of a circle but also for a sphere, semi-sphere, cone with a circular base, and a cylinder having circular bases.
A circle can be defined as the locus of a point moving in a plane, in such a manner that its distance from a fixed point is always constant.
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the volume of a gas held at constant temperature varies indirectly as the pressure of the gas. if the volume of a gas is 1200 cubic centimeters when the pressure is 200 millimeters of mercury, what is the volume when the pressure is 300 millimeters of mercury?
When the pressure is 300 mmHg, the gas has an 800 cc volume.
Boyle's second law is what?According to this, a gas's volume drops as pressure on it rises at a constant temperature. In other words, while the temperature and the quantity of molecules are both constant, Boyle's law states that volume is inversely proportional to pressure.
The answer to the dilemma is that at constant temperature, the relationship between the gas's volume (V) and pressure (P) is inverse.
V ∝ 1/P
or
V = k/P
V = 1200 cc when P = 200 mmHg
These values are put into the formula above to get the following results:
1200 = k/200
k = 240000
V = 240000/300
V = 800 cc.
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What is the tendency of an object to resist a change in velocity called?
The tendency of an object to resist a change in velocity is called inertia. It is the resistance of an object to a change in its direction or speed of motion.
This property of matter is explained by Newton's First Law of Motion, which states that an object at rest or in motion will remain in that state unless an external force acts on it.
Inertia is the basis for the concept of momentum, which is the product of an object's mass and velocity.
When an object is in motion, it has momentum and is resistant to any change in its velocity. This is because it has inertia, which is the tendency of an object to resist a change in motion.
Inertia is an important concept in physics and is essential for understanding the motion of objects in the universe.
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If a battery of 9 V is connected across a parallel plate capacitor with plate separation of 2 mm, what is the magnitude of the electric field between its plate when it is fully charged? A.4500 V/mB.9000 V/mC.18 V/mD.18000 V/mE.0 V/m
The magnitude of the electric field between the plates of the capacitor when it is fully charged is 4500 V/m, which corresponds to option A.
How to calculated the magnitude of the electric field between the plates of a parallel plate capacitor?The magnitude of the electric field between the plates of a parallel plate capacitor can be calculated using the formula:
E = V/d
Where
E is the electric fieldV is the voltage across the capacitord is the distance between the platesIn this case, the voltage V is given as 9 V and the plate separation d is given as 2 mm (which can be converted to 0.002 m). Substituting these values into the formula, we get:
E = 9 V / 0.002 m
E = 4500 V/m
Therefore, the magnitude of the electric field between the plates of the capacitor when it is fully charged is 4500 V/m, which corresponds to option A.
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two point masses m and m are separated by a distance d. if the separation d remains fixed and the masses are increased to the values 3m and 3m respectively, how does the gravitational force between them change?
When the masses of two point masses increase while the distance between them remains constant, the gravitational force between them increases proportionally to the square of the increase in mass.
What is gravitational force?
Gravitational force is the force of attraction between two masses. It is one of the four fundamental forces of nature and is responsible for the motion of celestial bodies, such as planets and stars, as well as the behavior of objects on the surface of the Earth.
The force of gravity between two masses can be described by Newton's law of universal gravitation, which states that every particle in the universe attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
The formula for the gravitational force is given by Newton's law of universal gravitation:
F = G * (m1 * m2) / d^2
where:
F is the gravitational force between two masses
G is the gravitational constant (G = 6.67 x 10^-11 N m^2/kg^2)
m1 and m2 are the masses of the two objects
d is the distance between the centers of the two masses.
CalculationThe gravitational force between two point masses is given by the formula:
[tex]F = G * (m1 * m2) / d^2[/tex]
where G is the gravitational constant and m1 and m2 are the masses of the two objects.
If the masses of the two point masses are increased from m to 3m, then the new formula for the gravitational force becomes:
[tex]F' = G * (3m * 3m) / d^2 = 9 * (G * (m * m) / d^2)[/tex]
Thus, the gravitational force between the two point masses is increased by a factor of 9 when the masses are increased to 3m.
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A stonecutter's chisel has an edge area of 0. 45 cm2. If the chisel is struck with a force of 46 n, what is the pressure exerted on the stone?.
The pressure exerted on the stone by the chisel is 1,022,222.22 Pa.
We know that
1 cm = 0.01 m, so 0.45 cm^2 = 0.45 x (0.01 m)^2 = 0.000045 m^2.
We can calculate the pressure exerted on the stone using the formula:
pressure = force / area
Substituting the given values, we get:
pressure = 46 N / 0.000045 m^2
pressure = 1,022,222.22 Pa (or N/m^2)
Pressure is the force exerted per unit area. It is a physical quantity that is crucial in a wide range of applications, including meteorology, engineering, and physics. Pressure can be defined as the amount of force exerted on a surface divided by the area of that surface. For example, when a person stands on a scale, the weight of their body is distributed over the area of the scale, creating pressure.
Pressure is typically measured in units of pascals (Pa), which is equivalent to one newton per square meter. Other units used to express pressure include atmospheres (atm), pounds per square inch (psi), and millimeters of mercury (mmHg). In fluids, pressure increases with depth due to the weight of the fluid above, and this principle is important in a wide range of applications, such as measuring blood pressure, designing water distribution systems, and predicting weather patterns.
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Suppose a current-carrying wire has a cross-sectional area that gradually becomes smaller along the wire so that the wire has the shape of a very long, truncated cone. How does the drift speed vary along the wire? a. It doesn't change b. It slows down as the cross section becomes larger. c. It speeds up as the cross section becomes larger. d. More information is needed.
The drift speed varies along the wire It slows down as the cross-section becomes larger. So option b is correct.
The drift speed of charges in a current-carrying wire depends on the electric field, which is related to the potential difference (voltage) between the ends of the wire and the wire's resistance.
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area, according to Ohm's law.
In a wire that has a cross-sectional area that gradually becomes smaller along the wire, the wire's resistance would increase along the length of the wire due to the decrease in cross-sectional area.
This would cause the potential difference between the ends of the wire to decrease along the length of the wire as well.
As the potential difference decreases, the electric field and the drift speed of charges would also decrease. Therefore, the drift speed of charges in the wire would slow down as the cross-sectional area becomes larger.
So the answer is (b) it slows down as the cross section becomes larger.
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Based on what you learned about telescopes, select all of the correct statements from the following list.
Option A. Radio telescopes usually make observations of very large regions of the sky. Option C. Radio telescopes are used to detect cool hydrogen. Option D. Radio telescopes have to be larger than optical telescopes, since radio waves are longer than visible light waves.
Option F. Radio waves can travel through obstacles that block out waves of visible light.
These statements are correct. The other two statements are incorrect. Interferometry can be used with radio telescopes to increase their resolution, and not all objects emit visible light, so radio telescopes can detect objects that are not visible in the optical spectrum. Radio telescopes are instruments used to detect radio waves emitted by astronomical objects in space. They are used to study a wide range of phenomena, from the cool hydrogen gas that permeates the universe to the high-energy radiation emitted by black holes and other exotic objects.
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Complete question:
Based on what you learned about radio telescopes, select all of the correct statements from the following list.
A. Radio telescopes usually make observations of very large regions of the sky.
B. The large size of radio telescopes make interferometery unnecessary.
C. Radio telescopes are used to detect cool hydrogen.
D. Radio telescopes have to be larger than optical telescopes, since radio waves are longer than visible light waves.
E. Since radio telescopes are so large, they have much better resolution than optical telescopes.
F. Radio waves can travel through obstacles that block out waves of visible light.
G. All objects emit visible light, so radio wavelengths just provide another way to look at them.
oxygen moves between the respiratory system and the circlatory system when it transfers from.. to...
Oxygen moves between the respiratory system and the circulatory system when it transfers from the bronchi to the capillaries. The correct option is d.
What is the respiratory system?The capillaries (small blood vessels) lining the alveolar walls allow oxygen to diffuse from the alveoli to the blood throughout this process.
Hemoglobin in red blood cells absorbs oxygen as it enters the bloodstream. Where the blood and lungs exchange gases are known as the "alveoli." Bronchi are the air passage of the lungs. It is a large passage that passes from the trachea to the lung.
Therefore, the correct option is d. bronchi, capillaries.
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The question is incomplete. The missing options are given below:
alveoli, capillaries
bronchi, trachea
capillaries, veins
bronchi, capillaries
How fast does a car travel in .75 hours if it’s moving at a constant sided of 45mi an hour
SKETCHPAD
Two friends push with great force against a rock. One friend pushes to the right
with 15 N of force. The other friend pushes in the opposite direction with 15 N of
force. Label the forces in the picture below.
The forces applied or exerted by the two friends will create an equilibrium force on the rock.
What are the two forces exerted by the tow friends?
The friend on the right will exert a rightward force
The friend on the left will exert a leftward force.
Since both forces are equal the rock will remain at equilibrium.
Equilibrium force refers to a state in which the net force acting on an object is zero, meaning the object is either at rest or moving at a constant velocity. This means that the sum of all forces acting on an object is equal to zero and there is no net acceleration. The object is said to be in a state of mechanical equilibrium.
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