Answer:
Explanation:
c. Assertion is correct but reason isn't
recent evidence suggests that mars once had a global magnetic field. assuming this is true, which of the following could explain why mars today lacks a global magnetic field like that of earth?
The explanation why Mars today lacks a global magnetic field like that of the Earth is because Mars's interior has cooled so much that its molten core layer no longer undergoes convection.
Why does plаnet Mаrs hаs no mаgnetic field like the eаrth?The Eаrth's mаgnetic field is generаted by the motions of the liquid mаteriаl under the surfаce, pаrticulаrly the outer core. Mаrs, аs а much smаller body, cooled off fаster, аnd this convective motion ceаsed. The mаgnetic field died with it, except for weаk locаl pаtches thаt remаin to this dаy. However, it did hаve а mаgnetic field for а while, which helped retаin wаter аnd аtmosphere just аs it does on Eаrth todаy - something like the first billion yeаrs of its history. This is why it is considered one of the most likely plаces to hаve supported life in the distаnt pаst.
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Brandon the child skater is propelled by a power rocket. Brandon and the rocket together have a mass of 25 kg. When
the thrusting force is 100 N and friction is 20 N. (a) what will be Brandon's acceleration? (b) How far will he go in 5 s if he
starts from rest?
The acceleration of the skater is 3.2 m/s^2 while the distance covered is 40 m
What is friction?The term friction has to do with the force that opposes motion. We know that the net force would be the difference between the thrust force and the frictional force since they act in opposite directions.
Now;
ma = 100 N - 20 N
The m is the mass of the object and the a is the acceleration of the skater.
25a = 100 N - 20 N
a = 100 N - 20 N/25
a = 3.2 m/s^2
Now;
s = ut + 1/2at^2
If u = 0 m/s (started from rest)
s = 1/2at^2
s = 0.5 * 3.2 * (5)^2
s = 40 m
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a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore. as a consequence, the raft does which of the following? [hint: use conservation of momentum.]
If a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore, the raft will move towards the shore.
According to law of conservation of momentum, the total linear momentum of a closed system remains constant. Initially the raft is at rest, so the magnitude of momentum is zero. Because,
p = m v
p = Momentum
m = Mass
v = Velocity
If v = 0, p = 0
According to law of conservation of momentum, the final magnitude of this must be zero. So if the boy walks away from the shore, the raft must move towards the shore to maintain this zero magnitude.
Therefore, if a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore, the raft will move towards the shore.
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velma's rocket ship is moving away from mort at a speed of 0.75c. mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c, according to the predictions of einstein's relativity, velma should observe this laser beam to move past her at a speed of
When Velma’s rocket is moving with 0.75c speed and observing the tip of the laser beam to move away from him at speed c, then Velma should observe this laser beam to move past her at a speed of 0.25C.
What is a Rocket?A rocket is a vehicle that accelerates without using the air around it by using jet propulsion. A rocket engine's reaction to high-speed exhaust is what gives it power. A rocket can fly in the vacuum of space because its engines are totally powered by fuel carried inside the craft.
What is a laser beam?A laser is a device that produces light using an optical amplification technique based on the electromagnetic radiation's stimulated emission.
According to the predictions of Einstein's relativity time dilates in a gravitational field which results in the above outcome.
Hence, when Velma’s rocket is moving with 0.75c speed and observing the tip of the laser beam to move away from him at speed c, then Velma should observe this laser beam to move past her at a speed of 0.25C
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suppose you dropped a rock from a bridge into a valley below. earth pulls on the rock and it accelerated downward. according to newton's third law, the rock must also be pulling on earth, yet we don't notice the earth acceleration upward. explain.
We don't notice the earth acceleration upwarde because of its massive size, the earth is at rest
State Newton's third law of motion?
Newton's Third Law can be described as the Action & Reaction law.According to his third law, there is an equal and opposite reaction to every force (activity) in nature.If object A applies a force to object B, object B will respond with an equal and opposing force.The stone also pulls on the Earth in an equal measure, but the acceleration caused by that force on the Earth is minimal. Given that the mass of the Earth is 6.4 × 10^24 kg, the accelerations brought about by the stone's force acting on the Earth will be of the order of 10^–24, or essentially nothing.
Hence, because of its massive size, the earth is at rest.
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An electric battery provides a current
☐ Alternative
☐ Synchronous
☐ Continuous
☐ Pulsed
Answer:
An electric battery provides a current.. answer is continuous
An object of mass 10 kg is placed on a frictionless
incline of 25°. Deduce how many seconds it would
take to travel down a 5.0 m incline from rest.
Initial velocity = 0 m/s
Displacement = 5 m
Acceleration = 10cos25° = 9.06 m/s^2
time = ? (To be calculated)
Using, S = ut + at^2/2, we have
5 = 0(t)+9.06t^2/2
10/9.06 = t^2
t = 1.006 seconds
If 10mC of charge passes through a battery of 12 V, how much energy is transferred to the charge?
Energy is transferred to the charge is 120J
What is energy?
Energy is a general term that we use frequently in our daily lives. Although the term "energy" is frequently misused, it has a specific physical meaning. In physics, energy is defined as something's ability to accomplish work. Energy can take various forms. All energy is either kinetic or potential. Let us take a closer look at what energy is and the many sorts of energy in this post.
On Earth, there are various types of energy. On Earth, the sun is considered the elemental form of energy. Energy is a quantifiable property in physics that can be transferred from an item to perform work. As a result, we can define energy as the ability to perform any type of physical activity.
According to the laws of energy conservation, "energy cannot be generated or destroyed; it can only be transformed from one form to another." Joule is the SI unit of energy. One of the fundamental rules of physics is the law of energy conservation. It regulates the movements of individual atoms in a chemical process at the microscopic level. According to the rule of conservation of energy, "the entire energy of the system is conserved in a closed system, i.e., a system that is separated from its surroundings." Even when energy transformation happens, the overall energy in a system is conserved, according to the law. Energy can't be created or destroyed.
E = Q X V
E=10X12
E=120J
Therefore, energy is transferred to the charge is 120J
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Student 1 claims that energy can only be transferred by particles inside a medium. Student 2 does not agree with Student 1. Which statement should Student 2 use as evidence that Student 1 is INCORRECT? A. Light energy can travel without a medium. B. Sound energy can travel without a medium. C. All types of energy can travel without a medium. D. Mechanical energy can travel without a medium.
Among the incorrect assertions are B. Sound waves can travel by themselves. C. Energy of all kinds can move without a medium. D. Mechanical energy is not dependent on a medium to move (B,C and D).
What causes energy to flow through a medium?Energy is transferred via the vibrations of the electric and magnetic fields in electromagnetic waves. When a sound wave travels through air or a solid medium, air or solid particle vibrations are used to transfer energy. The vibration of the water molecules in water waves transfers energy.
A medium is necessary for mechanical waves to transfer their energy from one place to another. An illustration of a mechanical wave is sound.
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a spotlight on the ground shines on a wall m away. if a man m tall walks from the spotlight toward the building at a speed of , how fast is the length of his shadow on the building decreasing when he is m from the building?
The shadow is decreasing at the rate 0.9375 m/s if wall 12m away and man 2m and speed 2.5 m/s and shadow is 4m.
Let height of shadow= y,CD=x
Height of man=2 m
Speed of man= dx/dt=2.5m/s
ΔABD=ΔECD
therefore, AB/EC=BD/CD
y/2=12/x
xy=24
differentiate w.r.t t
xdx/dt+ydx/dt=0
xdy/dt=-ydx/dt
dy/dt = - y/x dx/dt
dy/dt=-3/8*2.5=-0.9375 m/s
length of shadow is decreasing at the rate of 0.9375 m /s
Therefore,
Speed is a term used to describe an object's magnitude of velocity. Kinematics typically examines speed. Dispatching, expedition, haste, and hurry are some frequent synonyms for speed. In spite of the fact that all of these words refer to "quickness in movement or action," the word "speed" suggests quick efficiency in movement or action. Additionally, some people use various forms of speed to suppress their appetite. Velocity, as opposed to speed, refers to the rate and direction of an object's movement as it moves along a path. Speed is defined as the rate at which a distance changes over time with a Velocity. It has a distance by time dimension. The basic unit of distance plus the basic unit of time are combined to form the SI unit of speed. The metric system uses meters per second as the unit of speed.
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How long has Pripyat been unoccupied?
The numbers of years that Pripyat been unoccupied is 36 years.
Why was Pripyat left behind?"The Chernobyl tragedy damaged the ecology irreparably, and the effects will continue for thousands of years." Due to excessive radiation levels, the area was evacuated, and Pripyat, a once-vibrant city of 50,000 people that included many nuclear plant workers, was left in ruins. Its urban landscape become covered with trees and vines over time.
Therefore, According to experts, the region won't be secure for at least 3,000 years; nevertheless, other people think this estimate is overly optimistic. A 2016 research states that it is anticipated that the reactor site won't be livable for at least 20,000 years.
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what will the total kinetic energy of the molecules in this system be when the system reaches equilibrium?
Answer:
When the system reaches equilibrium, the total kinetic energy of the molecules will be zero.
the sides of a yield sign all have the same length (see figure). the perimeter of a roadway yield sign is 219 centimeters. find the length of each side.
A roadway yield sign's exterior measurement is 219 centimeters. Consequently, the yield sign is 73 centimeters long on each side.
The perimeter of a given figure is equal to the total length of its sides.
Given that a yield sign's sides are uniform in length As a result, if the yield sign's perimeter is determined, it will be,
The yield sign's perimeter equals x + x + x.
Sphere = 3x
Therefore, if the circumference of a roadway yield sign is 219 centimeters, we can rewrite the circumference as,
Perimeter = 3x
219 centimeter = 3x
x = 219 centimeter / 3
x = 73 centimeter
Consequently, the yield sign is 73 centimeters long on each side.
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Henry is trying to move his 232 kg refrigerator. He is pushing, but the refrigerator is not moving. If the maximum coefficient of friction between the refrigerator and the floor is 0.87, how hard does Henry have to push in order to get the refrigerator to move?
Answer:
Once the fridge is moving you are still applying the same push force but now the opposing friction (now kinetic) force is less.
consider the three resistors and the battery in the circuit shown. which resistors, if any, are connected in series? g
No resistors are connected in series.
A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance.
A resistor is an electrical component that controls or restricts how much electrical current can pass across a circuit in an electronic device. Additionally, resistors can be used to supply a particular voltage to an active device like a transistor.
A passive electrical component called a resistor prevents the flow of electric current by introducing resistance. They are present in practically all electrical networks and electronic circuits. Ohms are used to measuring resistance.
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a parachute slows down the speed of a skydiver. What does the parachute do?
Answer:
BELOW
Explanation:
Basically it adds AIR FRICTION.
What caused the need for topographic maps to be updated?
There is the need for topographic maps to be updated because it makes resources and environment monitoring more significant
What is a Topographic map?This is referred to as a type of map which shows the shape of the Earth's surface through the use of contour lines. The geographical representation is also important in the socio-economic development of a country or place.
In developing countries , there is the need to monitor the resources and environment due to different changes occurring as a result of high human activity influence such as mining, pollution etc in which the government has to discover methods to control it and avoid resources depletion.
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Use the image of chlorophyll to answer the question.
How are carbon atoms represented in this image?
a.) white circles
b.) red circles
c.) blue circles
d.) dark grey circles
The carbon atoms in this image are shown as white circles. It has 55 carbon atoms coupled to 72 hydrogen atoms, 5 oxygen atoms, 1 magnesium atom, and differently substituted porphyrin rings with magnesium.
The phytol chain, a long carbon-hydrogen side chain, connects the ring to the porphyrin ring, a nitrogen-containing structure that surrounds the central magnesium atom in the chlorophyll molecule. Chlorophyll is the primary pigment used by plants to absorb light energy. A chlorophyll molecule has a porphyrin head and a long hydrocarbon tail.
Chlorophyll comes in four different varieties: chlorophyll a, which is present in all higher plants, algae, and cyanobacteria; chlorophyll b, which is present in higher plants and green algae; chlorophyll c, which is present in diatoms, dinoflagellates, and brown algae; and chlorophyll d, which is only present in red algae.
Thus, we might conclude that the white circles in this figure represent the carbon atoms.
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Which ituation with or without friction i more imilar to your everyday experience on a kateboard or bicycle?
Skateboarders move more quickly and more slowly depending on the gravitational field around them.
Skateboarders go more slowly and more quickly depending on the amount of friction they encounter. The skater initially has no kinetic energy, only potential energy. The skater had used all of the energy that she will ever have. Since the track is frictionless, no energy is converted to thermal energy throughout the route from point A to point B. The skater has greater potential energy the higher he is. His kinetic energy increases and his potential energy falls as his height decreases. Ice skating is a good illustration of sliding friction.
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24.11 a capacitor is made from parallel plates with a plate area of .0178 m2 . the plates are placed 0.35 mm apart and filled with a dielectric material. if the capacitance of the capacitor is 1.44 x 10-9 f, what is the dielectric constant of the material?
Using the buildup of electric charges on two neighbouring surfaces that are electrically insulated from one another, a capacitor is a device that stores electrical energy in an electric field. It is an electrical passive component with two terminals. Capacitance is the measurement of a capacitor's effect.
C = ∈oA / d = (8.85 * 10⁻¹² * 0.0178) / (0.35 * 10⁻³)
= 4.5 * 10⁻¹⁰ F
Q = C*V = (4.5 * 10⁻¹⁰ * 27)
= 1.215 * 10⁻⁸ C
E = V / d = 27 / (0.35 * 10⁻³)
= 7.71 * 10⁴ N/C
An electrical energy storage device called a capacitor is made up of two conductors that are situated close to and insulated from one another. A parallel-plate capacitor serves as an easy-to-understand illustration of one such storage device.
In contrast to a battery, a capacitor is a part of a circuit that uses a potential difference created by charged particles distributed between (typically two) plates to temporarily store electrical energy. A capacitor may charge more quickly than a battery and can quickly release all of its stored energy.
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If light and sound travel from point A to point B and start at the same time, which will reach point B first? Responses A sound.sound. B light and sound at the same time.light and sound at the same time. C light in some situations, sound in others.light in some situations, sound in others. D light.
If light and sound travel from point A to point B and start at the same time, then Light will reach point B first as the speed of light is much greater than that of sound.
Light is an electromagnetic wave that can travel in a vacuum as well. It does not require any medium for transference. Light is a transverse wave, that is, the medium moves in the direction perpendicular to that the direction of propagation of the wave.
The speed of light in a vacuum is 3 × [tex]10^{8}[/tex] m/s
Sound is a longitudinal wave, and the direction of disturbance is parallel to the propagation of the wave. It cannot travel without a medium.
The speed of sound is maximum in air.
Speed of sound in air = 343 m/s
Thus, The speed of sound is greater than that of sound. So, the light will reach first.
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A car moving with the initial velocity of 30 m/s slows down at a constant rate of -3 m/s2. What distance does the car cover over this time?
Distance does the car cover over this time is 150 meter.
What is velocity?When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.
Given that car moving with the initial velocity of 30 m/s slows down at a constant rate of -3 m/s².
Using equation of motion
v² = u² +2as
s = -u²/2a
s = 30²/2.3
s = 150 meter
Distance does the car cover over this time is 150 meter.
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A balloon rises at a rate of 4 meters per second from a point on the ground 50 meters.
50 metres away from the observer, a balloon begins to rise at a rate of 4 metres per second. When the balloon is 50 metres above the ground, determining how quickly the angle of elevation between the observer and the balloon changes.
Let h be the height of the balloon above the ground and represent the angle of elevation.
tanθ= h/50
provided that a balloon's height is 50 metres
tanθ =50/50
tanθ=1
θ=45o
tanθ= h/50
differentiating in light of time t
(1/50)dh/dt sec2 d/dt
Given that the balloon rises at a rate of 4 metres per second, we obtain 45o, therefore dh/dt = 4 m/s.
sec245o d=1/50*4 dt
2*dθ/dt= (1/50)*4
dθ/dt= (1/50)*4/2
dθ/dt= 1/25
0.04 rad/sec for d/dt.
When the balloon is 50 metres above the ground, the angle of elevation of the balloon is changing at a rate of 0.04 rad/sec from the observer.
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Stuart is listing the changes to matter and energy that occur during the process of photosynthesis. Which of these examples should he include in his list?.
The energy that occur during the process of photosynthesis that changes to convert light energy into chemical energy stored in carbohydrates.
What is meant by photosynthesis?Photosynthesis occurs in plants that have chlorophyll and converts the solar energy absorbed into the chemical fuel required for energy generation.
Photosynthesis is primarily responsible for producing and sustaining the oxygen content of the Earth's atmosphere, as well as providing the majority of the energy required for life on Earth.
Plant leaves absorb sunlight and convert it into glucose and oxygen with the help of water and carbon dioxide.
Carbohydrates are broken down and undergo chemical changes in the presence of sun radiation, resulting in sustenance.
As a result, light energy is converted into chemical power during photosynthesis.
The plants convert the sunlight into glucose and oxygen with the help of water and carbon dioxide.
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When the index card is quickly pulled away from the glass in a horizontal direction, why does the disk fall straight down into the glass?
a. kinetic friction
b. inertia
c. static friction
d. equilibrium
The disk falls straight down into the glass due to inertia. Therefore, option (B) is correct.
What is the Law of Inertia?The Law of inertia can be described as an object will continue to be in a state of rest or in motion unless an external force applies to it. All objects will come to rest and moving objects will continue to move in the absence of external power.
When the resistance is given by the body to continue to be in motion until an external force applies to it. Inertia s the reason the body to continue the motion in the same direction in the absence of external force. Inertia depends on density and mass, not on velocity.
When the index card is quickly pulled from the glass in a horizontal direction, the disk falls straight down into the glass as the disk tries to stay at rest due to inertia.
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George has a mass of 65kg. What would george weigh on the moon? (the gravitational field strength on the moon is 1. 6n/kg. ).
George's weight on the moon is 104 N.
A gravitational field is a version used to give an explanation for the influence that a huge body extends into the gap around itself, producing a force on another huge frame. thus, a gravitational subject is used to provide an explanation for gravitational phenomena and is measured in newtons in step with kilogram.
That is a manner of measuring how a good deal of gravity there is. The method is weight/mass = gravitational discipline strength. on earth, the gravitational area energy is 10 N/kg.
Calculation:-
Given,
George's mass = 65kg
Gravitational field strength on the moon = 1. 6 N/kg
Then, the weight of George on the Moon = Mass x Gravitational field strength
= 65 x 1.6
= 104 N
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you place a 7/50 kg television set on a spring scale. if the scale reads 78.4 n, what is the acceleration due to gravity at that location?
The acceleration due to gravity is 9.8 m/s^2.
What is gravity?
In mechanics, gravity—also known as gravitation—is the constant force of attraction that pulls all matter together. It has no impact on determining the internal characteristics of common matter because it is by far the weakest known force in nature. In contrast, it governs the structures as well as evolution of stars, galaxies, as well as the entire cosmos through its extensive and universal action, which affects the trajectories of objects in the solar system and throughout the universe. All objects on Earth have a weight, or a gravitational pull downward, proportional to their mass, which is a result of the mass of the planet. The acceleration that gravity gives to objects falling freely serves as a gauge of its strength. The acceleration of gravity at Earth's surface is approximately 9.8 metres (32 feet) per second for every second.
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The relative ability of a bonded atom to attract shared electron pairs is called its _____. This ability _____ as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei.
Electronegativity is defined as the ability of an atom in a molecule to attract electrons to itself. The concept of an electronegativity scale for the elements was proposed by Pauling.
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What is the net force in this image?
Net force on the image is 0 Newton.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Net upward force is balanced by net downward force so net force is zero.
Net force on the image is 0 Newton.
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What is the net force in this image?