When a wet cloth is hung up in a hot wind in the desert, it is
cooled by evaporation to a temperature that may be or so
below that of the air. Discuss this process in light of the second law of thermodynamics
Answer:
The process of a wet cloth being cooled by evaporation when hung in a hot wind in the desert can be explained by the second law of thermodynamics, as the evaporation of water molecules from the cloth increases their entropy and absorbs heat energy from the surrounding air, which causes the temperature of the wet cloth to decrease, and increases the overall entropy of the system.
Explanation:
The process of a wet cloth being cooled by evaporation when hung in a hot wind in the desert can be explained by the second law of thermodynamics. The second law states that entropy, or disorder, in a closed system will always increase over time.
When the wet cloth is hung in the hot wind, water evaporates from the cloth, absorbing heat energy from the surrounding air in the process. This causes the temperature of the wet cloth to decrease. In the process of evaporation, the entropy of the water molecules in the cloth increases, as they gain kinetic energy and escape into the air as water vapor. The entropy of the air molecules surrounding the cloth also increases, as they absorb the heat energy released by the evaporating water and become more disordered.
This process of evaporation, in which the wet cloth loses heat energy and becomes cooler, is an example of a process that increases the overall entropy of the system. This is in accordance with the second law of thermodynamics, which states that entropy in a closed system will always increase over time.
The cooling provided by the evaporation is due to the energy required to change the phase of the water from liquid to gas, this process is known as heat of vaporization, which is endothermic, meaning it absorb heat energy from the surrounding and hence the wet cloth is cooled.
A ball is whirled in a horizontal circular path on the end of a string. Predict the path of the ball when the string breaks, and explain your answer.
The ball will move tangentially to the circle in a straight path due to inertia. The ball may travel in a parabolic direction after the string snaps because of gravity's potential net downward pull.
What exactly is inertia?A property of matter where it remains at rest or travels uniformly in one direction in the absence of an external force. When the bus stops unexpectedly, people slump forward. When a bus driver suddenly applies the brakes, the upper portion of the body continues to go forward due to the inertia of motion, but the bottom portion of the body stops together with the bus.
Does inertia have a force?Inertia is what holds the universe together. Literally. The material would not have the electric forces necessary to form its current configuration without it. Moving particles generate heat and kinetic energy, which operate to counteract inertia.
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what causes certain elements to be pulled into a region of stronger magnetic field? select all that apply
Most electrons in materials like iron, cobalt, and nickel spin in the same direction. Another extremely magnetic material must enter the magnetic field of an existing magnet in order to become magnetized.
The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field. The magnetic field of a permanent magnet pulls on ferromagnetic substances like iron and attracts or repels other magnets.
Paramagnets, diamagnetism, and antiferromagnetic are three more magnetic effects, albeit these forces are often so weak that they can only be observed with specialized laboratory equipment. Electric currents, like those utilised in electromagnets, and electric fields that change in time produce magnetic fields that surround magnetised things. Since a magnetic field's direction and strength can change depending on the location, it can be mathematically characterized by a function that assigns a vector to each point in space. This function is known as a vector field.
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a 2kg box slides down a frictionless ramp starting from a height of 3m. the slope of the ramp is 30 degrees. what is the box's momentum when it reaches the bottom of the ramp?
The momentum of the box is 21.2 kg m/s.
What is momentum?Momentum is a concept in physics that describes the tendency of an object to keep moving in the same direction unless acted on by an external force. Momentum is a vector quantity, which means it has both a magnitude (or size) and a direction. It is defined as the product of an object's mass and its velocity. Momentum is related to inertia, which is an object's resistance to change in motion. Momentum can be transferred between objects when they collide or interact in some other way.
Momentum is the product of mass and velocity. In this case, the box has a mass of 2kg and its velocity can be calculated using the equation for a body sliding down an inclined plane:
V = √2gh, where V is the velocity, g is the acceleration due to gravity (9.81 m/s2), h is the height of the ramp (3m).
Using this equation, the velocity of the box at the bottom of the ramp is 10.6 m/s. Therefore, the momentum of the box is 21.2 kg m/s. Momentum can also be calculated using the equation p = mv, where p is momentum, m is mass and v is velocity. Using this equation, the momentum of the box is 21.2 kg m/s.
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the approximate distance between the earth and the sun is 1.5 × 1011 meters. a. Calculate the average speed, in kilometers per second, of the Earth in its orbit.b. What is that speed in meters per second?
The speed of the earth around the sun is 29.747 km/sec and in meter per second is 29474 m/sec, if the distance between the earth and the sun is 1.5 × 10¹¹ meters.
The gravitation force between the earth and the sun works as the centrifugal force between the earth and the sun, which is required for the circular motion of the earth.
Let the mass of the earth = M₁
Let the mass of the sun = M₂ = 1.99 × 10³ kg
Let the speed of the earth around the sun = v
Distance between the earth and the sun, R = 1.5 × 10¹¹ m
Universal gravitational constant, G = 6.67 × 10⁻¹¹ Nm²/kg²
Centrifugal force = gravitational force
M₁ v²/R = GM₁M₂/R²
v = √(GM₂/R)
v = √(6.67× 10⁻¹¹ × 1.99 × 10³)/(1.5 × 10¹¹))
v = 29474.04 m/sec
or v = 29.474 km/sec
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what is the ecliptic? what is the ecliptic? the sun's daily path from east to west in our sky the path the sun appears to trace around the celestial sphere each year a half-circle extending from your horizon due north, through your zenith, to your horizon due south the path traced by the moon's shadow on earth during a solar eclipse
The orbital plane of the earth around the Sun is known as the ecliptic or ecliptic plane a path along the ecliptic can see against a background of stars from earth as the Sun moves around the celestial sphere.
Describe the ecliptic.Ecliptic in astronomy is the large circle that represents the Sun's apparent movement through the constellations over the course of a year from another angle it is the representation of Earth's orbit around the Sun on the celestial sphere Along the ecliptic the constellations of the zodiac are organized.
What are the Sun's ecliptic path?The sun's journey is indicated by the ecliptic a fictitious line in the sky Along with the moon planets also follow the ecliptic It designates the plane of the solar system by projecting Earth's orbit onto the cosmic sphere.
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A stone is propelled vertically off the ground. After it is released, which of the following are true? It’s total mechanical energy increases It’s total energy is proportional to its distance off the ground It’s kinetic energy decreases It’s gravitational energy increases
When a stone is propelled vertically off the ground its kinetic energy decreases and gravitational potential energy increases.
When an object is propelled upwards at first it have the highest kinetic energy. The total energy will be equal to kinetic energy and potential energy will be 0. When it reaches midway through the air, the kinetic energy gradually decreases and potential energy increases, because some of the kinetic energy is converted to gravitational potential energy.
When the object reaches the maximum height, the Kinetic energy will become 0, and object stops moving forward. Here all the kinetic energy i converted to gravitational potential energy. Potential energy will be maximum at this point. After this the object begins to fall attaining some kinetic energy.
So when an object is thrown vertically upwards, the kinetic energy decreases and gravitational energy increases. The total energy will remain constant throughout.
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Imagine that a white car is moving 5km/he west when a yellow car moving 10 km/hr west collides with it from behind. what happens to each car kinetic energy?
While the yellow car's kinetic energy decreases, the white car's kinetic energy increases. Unless an outside force acts upon a body, Newton's motion law states that it will be at rest or in uniform motion. KE= 1/2mv2 is the formula for kinetic energy.
What does kinetic energy mean in plain English?The energy that an object possesses as a result or motion is referred to as kinetic energy. We can only accelerate an object by exerting force. Applying force requires effort on our part. Upon completion of the task, the object will indeed be moving at a stable, constant pace since energy has been transmitted to it.
What do you mean by kinetic energy?Exactly what is kinetic energy? Kinetic energy is a type of power that a thing or particle has as result of the its movement. By being exposed to something like a net force, an object transfers energy through work, accelerating and gaining kinetic energy in the process.
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A student claims that the force on the sides of a tall object submerged in water is the same at all points on the object. Which of the following is evidence that indicates the student is wrong?
answer choices
The pressure of the water increases with depth, so molecules of water must, on average, exert a greater force on a surface at a greater depth.
The force exerted on one side of the object is balanced by the force exerted on the opposite side.
The buoyant force is the result of electrostatic repulsion between electrons in the molecules of an object and the liquid it is in.
The buoyant force is proportional to the volume of the liquid that the object displaces, but this does not support the student's claim that the forces on the sides are equal everywhere.
The evidence that indicates the student is wrong that the pressure of the water increases with depth, so molecules of water must, on average, exert a greater force on a surface at a greater depth.
What is the object's buoyant force?The upward force a fluid applies to an item is known as buoyant force. The buoyant force is equal to the weight of the displaced fluid, according to Archimedes' Principle. A body submerged partially or completely in a fluid appears to weigh less because of the buoyant force.
How does a buoyant object affect the amount of water it moves?The Archimedes principle states that a body submerged in a fluid experiences buoyant force equal to the weight of the fluid the body displaces.
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at point b of the swinging pendulum, there are 40 joules of kinetic energy (ke) and 20 joules of potential energy (pe). how many joules of energy will there be at point e?
There will be 60 joules of energy at point e in a swinging pendulum.
What do you mean by energy?Energy is a property of physical systems that can be transferred or transformed, but not created or destroyed. Energy can take many forms, such as thermal, mechanical, electrical, chemical, nuclear, and others.
How do you determine?In a simple pendulum, the total mechanical energy (the sum of kinetic and potential energy) is conserved. This means that the total energy at any point in the pendulum's motion is equal to the total energy at any other point in the pendulum's motion.
So, if there are 40 joules of kinetic energy and 20 joules of potential energy at point B, the total energy at point B is 40 joules + 20 joules = 60 joules. Since the total mechanical energy is conserved, the total energy at point E will also be 60 joules.
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a wheel 2.00 m in diameter lies in a vertical plane and m rotates about its central axis with a constant angular acceleration of 4.00 rad/s2. the wheel starts at rest at t 5 0, and the radius vector of a certain point p on the rim makes an angle of 57.38 with the horizontal at this time. at t 5 2.00 s, find (a) the angular speed of the wheel and, for point p, (b) the tangential speed, (c) the total acceleration, and (d) the angular position.
The angular speed of the wheel is 8.00 rad/s. The tangential speed of point P is 16.00 m/s. The total acceleration of point P is 8.00 m/s^2. The angular position of point P is 73.38 rad.
What does velocity mean?The pace at which an object's position changes as perceived from a particular point of view and as measured by a particular unit of time (for example, 60 km/h northbound) is defined as its velocity.
How can we determined this?(a) The angular speed of the wheel at t = 2.00 s can be found using the equation for angular acceleration:
ω = ω0 + αt
where ω is the final angular speed, ω0 is the initial angular speed (which is zero, since the wheel starts at rest), α is the angular acceleration, and t is the time.
ω = 0 + (4.00 rad/s^2)(2.00 s) = 8.00 rad/s
(b) To find the tangential speed of point P, we can use the equation:
v = rω
where v is the tangential speed, r is the radius of the wheel (2.00 m), and ω is the angular speed (8.00 rad/s).
v = (2.00 m)(8.00 rad/s) = 16.00 m/s
(c) The total acceleration of point P can be found by summing the radial and tangential components of acceleration. The radial acceleration is given by:
ar = αr = (4.00 rad/s^2)(2.00 m) = 8.00 m/s^2
The tangential acceleration is given by:
at = αr = (4.00 rad/s^2)(2.00 m) = 8.00 m/s^2
The total acceleration is the vector sum of the radial and tangential accelerations:
atotal = √(ar^2 + at^2) = √(8.00 m/s^2 + 8.00 m/s^2) = √(64 m^2/s^4) = 8.00 m/s^2
(d) The angular position of point P can be found using the equation:
θ = θ0 + ω0t + 1/2αt^2
where θ is the final angular position, θ0 is the initial angular position (57.38 degrees), ω0 is the initial angular speed (0 rad/s), α is the angular acceleration (4.00 rad/s^2), and t is the time (2.00 s).
θ = 57.38 + (0)(2.00 s) + (1/2)(4.00 rad/s^2)(2.00 s)^2 = 57.38 + 16 rad = 73.38 rad
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how would you know an instrument is dull? select all that apply. a. reflects light b. does not reflect light c. the end is rounded d. bites into the plastic stick test
The right answer is (B) does not reflect light. An instrument that reflects light is likely to be sharp and in good condition, while an instrument that does not reflect light may be dull or damaged.
How is plastic created?Natural resources like wood, coal, natural gas, salt, and crude oil are used to make plastics through the polymers or polycondensation process. Natural, organic resources like cotton, coal, natural gas, salt, and, of course, crude oil are used to produce plastics.
Can people exist without plastic?Industrial agriculture as we know it now would not be viable without plastic. Shorter food chains would be preferable; consider farm shops and neighborhood farming. However, this would necessitate major changes in the locations and methods of food production given that cities currently house more than half of the world's population.
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What do you think are the factors that might affect the magnitude of this angle
The bond angle in a compound is the angle formed between two bonds in the compound. It is affected by the geometry, electron cloud and the size of atoms.
What is bond angle ?Bond angle is the distance between two chemical bonds in a compound. Bond angle is affected by the electrostatic force of repulsion and attraction. Hence, the presence of lone pairs and bond pair are the main factors affecting the bond angle.
If there are lone pairs, the repulsion between two lone pairs is greater than that between a lone pair and bond pair which in turn greater than that between two bond pairs.
Hence, the electron clouds will align themselves to minimize the repulsion. Thus, the geometry and bond angle may vary from what we predicted based on hybridization.
In general, the bond angle for linear geometry is 180° and that of trigonal planar geometry is 120 and bond angle for a tetrahedral complex is 90°
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Your question is incomplete. But your complete question probably was:
What is bond angle? What do you think are the factors that might affect the magnitude of this angle?
Calculator
What is the force experienced by a person whose momentum changes by 3kgm/s in 2s?
Give your answer to 1 decimal place.
D1:28/3:42 Change in Momentum
Add any workings here
Force =
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The force experienced by a person whose momentum changes by 3kgm/s in 2s is 1.5N.
How to calculate force?The force is defined as rate of change in momentum thus,
Force= Change in momentum/ time
Force= 3/2
Force = 1.5N
How force and momentum related?The relationship between force and momentum is given by
F=dp/dt. The second law of motion gives the following equation given by Newton. This law states that the change in momentum of an object due to its mass is given by its acceleration, or force.
Force (F) is equal to change in momentum (ΔP) with respect to change in time (Δt). Also, the change in momentum (ΔP) is equal to the momentum (J). Impulse has the same units as impulse (kg*m/s or N*s).
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say true or false
1. the direction of impulse is the direction of net force and linear momentum
The direction of impulse is the direction of net force and linear momentum is referred to as true statement.
What is Impulse?This is referred to as a certain amount of force you apply for a certain amount of time to cause a change in momentum.
It is also known as the integral of a force, F, over the time interval, t, for which it acts and is a vector quantity and the direction is also equal to the direction of the net force and linear momentum which is therefore the reason why true was chosen as the correct choice.
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Measure the value of the radius of curvature and deduce the value of the focal length.
The radius of curvature is observed to be equal to twice the focal length for spherical mirrors with small apertures. Hence R = 2f.
Does focal length increase with a radius of curvature?As the radius of curvature for a lens grow (R2 > R1), the curvature of the lens decreases, and the focal length of the lens expands (f2 > f1) We can say clearly that the main focus of a spherical mirror lies at the core between the center of curvature and the pole.
the radius of curvature becomes longer the circle gets larger. As the circle gets larger, its curve gets praised, as the curve gets admired on a clear material Focal length of a lens depends on the deform index of the glass from which it is built, and on the curvature of its two surfaces.
So we can conclude that the result of a radius of curvature on the focal length of a convex lens.
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A sinusoidal electromagnetic wave is propagating in a vacuum in the +z-direction. If at a particular instant and at a certain point in space the electric field is in the +x-direction and has a magnitude of 4.00 V/m, what is the magnitude of the magnetic field of the wave at this same point in space and instant in time? What is the direction of the magnetic field?
1.3x10^-8 T is the direction of the magnetic field.
What is magnetic field?
According to mathematics, the electric field is described as a vector field that may be connected to each point in space and represents the force per unit charge that is applied to a positive test charge that is at rest at that location. Either the electric charge or time-varying magnetic fields can produce an electric field.
What is electromagnetic wave?
A magnetic field and an electric field vibrate together to produce electromagnetic waves, often known as EM waves. In other terms, magnetic and electric fields that are oscillating make up electromagnetic waves (EM).
E/B = c
B = E/c = 3.9/(3x10^8) = 1.3x10^-8 T
Therefore, 1.3x10^-8 T is the direction of the magnetic field.
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The tip of one prong of a tuning fork undergoes SHM of frequency 842 Hz and amplitude 0.518 mm. For this tip, what is the magnitude of the (a) maximum acceleration, (b)maximum velocity, (c) acceleration at tip displacement 0.257 mm, and (d) velocity at tip displacement 0.257 mm?
Simple harmonic motion is described as the periodic motion of a point along a straight line with an acceleration that is always toward a fixed point in that line and a distance from that point that is proportional to that acceleration.
The force driving the movement is always pointed in the direction of the equilibrium position and is inversely proportional to the separation from it. F = kx, where F is the force, x is the displacement, and k is a constant, is what this means. Hooke's law is the name of this relationship.
The vibrating of a mass coupled to a vertical spring, the other end of which is anchored in the ceiling, is a specific illustration of a basic harmonic oscillator. The spring is at its highest stress at the maximum displacement x, which drives the mass higher.
The acceleration amplitude is am = ω²хm , where ω is the angular frequency (ω=2πf since there are 2π radians in one cycle). Therefore, in this circumstance, we obtain
am = {2π(842 Hz)}² (0.000518m)
= 1.4483 = 1.4 × 10⁴ m/s².
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a glider of mass 0.150 moves on a horizontal frictionless air track. it is permanently attached to one end of a massless horizontal spring, which has a force constant of 10.0 both for extension and for compression. the other end of the spring is fixed. the glider is moved to compress the spring by 0.180 and then released from rest. calculate the speed of the glider (a) at the point where it has moved 0.180 from its starting point, so that the spring is momentarily exerting no force and (b) at the point where it has moved 0.250 from its starting point.
It possesses a force characteristic of 10.0 Y e and is fixedly coupled to one side of a massless vertical spring. The spring's opposite end is fastened.
What is the straightforward meaning of force?
Strength or energy used to move something or affect a change in something. the natural forces.
What is a force unit?
The newton, abbreviated N, is the Si derived unit of force.
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what is the sign of the transferred energy from the perspective of the system and the surroundings for (1) a swimmier in a pool with cold water? (2) a heated house? (3) a coffee cup? (4) an ice cold drink in a warm bar? (5) a cold hand shaking a warm hand?
Option (4) is correct, an ice cold drink in a warm bar is the sign of the transferred energy from the perspective of the system and the surroundings.
Describe energy.In order to accomplish work and to produce heat and light, energy must be transported to a body or into a physical system. Energy is indeed the quantitative attribute that does this. Energy can be modified in form but it cannot be created nor destroyed, according to the rule of conservation of energy.
How is energy quantified?The Joule is the standardized (SI) unit of measurement for energy (J). This measurement comes from the idea that energy is the capacity for work. Joules, a unit of measure for work that is obtained by multiplying force by distance
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Circle the correct word...
1. A touch screen on a phone is an example of a device that uses a... capacitor/CCD
2. When you bring your finger close to the screen your finger acts as one of the... plates/terminals
3. A sensing circuit works out the... position/temperature... of your finger. The camera on a phone is an example of a device that uses a... capacitor / CCD.
4. Light hits a grid of devices that produce... charge/current.
5. Each of the squares is a... capacitor/pixel.
Answer:
A touch screen on a phone is an example of a device that uses a capacitor.
When you bring your finger close to the screen your finger acts as one of the plates.
A sensing circuit works out the position of your finger. The camera on a phone is an example of a device that uses a CCD.
Light hits a grid of devices that produce charge.
Each of the squares is a capacitor.
which characteristic of motion is a maximum when an object in simple harmonic motion is at its maximum displacement?
When an object in simple harmonic motion is at its maximum displacement, its acceleration is also at a maximum.
The speed is zero when the simple harmonic motion is at its maximum displacement, however, the acceleration is the rate of change of velocity. The velocity reverses the direction at that point therefore its rate of change is maximum at that moment. thus the acceleration is at its maximum at this point.
Acceleration is the term used in mechanics to describe the pace at which the velocity of an object varies over time. Acceleration is a vector quantity (in that they have magnitude and direction). The direction of an object's acceleration is determined by the direction of the net force acting on it.
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a glass window of width w 1 m and height h 2 m is 5 mm thick and has a thermal conductivity of kg 1.4 w/mk. if the inner and outer surface temperatures of the glass are 15 c and 20 c, respectively, on a cold winter day, what is the rate of heat loss through the glass? to reduce heat loss through windows, it is customary to use a double pane construction in which adjoining panes are separated by an air space. if the spacing is 10 mm and the glass surfaces in contact with the air have temperatures of 10 c and 15 c, what is the rate of heat loss from a 1 m 2 m window? t
A 5mm thick glass window with dimensions of W=lm and H=2m has a heat capacity of 1.4 w/mK. If the glass's internal and external surface temperatures are different.
What do you mean by thermal?
Thermal refers to a condition brought on by or involving heat or temperature. In science, the term "thermal" refers to a particular type of energy called thermal energy. Getting hot molecules and electrons causes them to accelerate and collide with one another, generating thermal energy.
What does the physics term "thermal" mean?
The energy present inside a system that establishes its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is an entire school of physics that examines how heat is transmitted across various systems and how
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A cylinder in a steam engine contains 1.8kg of steam at 50 kPa and a volume of 0.200m^3.Heat is added to the steam, causing it to expand against a frictionless piston, until the temperature reaches 500 degrees celsius
The final volume of the steam is 0.8 m^3, which is an increase of four times the initial volume. This expansion is due to the heat added to the steam, causing the steam molecules to move faster and occupy a larger volume.
How to determine the inal state of the steam?To determine the final state of the steam after it has been heated, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in kelvin.
We can use this equation to solve for the final volume of the steam after it has been heated to 500 degrees celsius. We can assume the steam is an ideal gas.
First, convert the initial temperature of 50 kPa to kelvin:
T1 = 50 + 273.15 = 323.15 K
Next, convert the final temperature of 500 degrees celsius to kelvin:
T2 = 500 + 273.15 = 773.15 K
The ideal gas constant R = 8.314 J/mol.K
We know the mass of steam is 1.8 kg, and we can use the molar mass of water, which is 18 g/mol, to calculate the number of moles of steam n = 1.8 kg / 18 g/mol = 0.1 mol.
Now we can use the ideal gas law to solve for the final volume of the steam, using the information we have:
P1V1 = nRT1
V1 = nRT1/P1 = 0.1 mol * 8.314 J/mol.K * 323.15 K / 50 kPa = 0.200 m^3
P2V2 = nRT2
V2 = nRT2/P2 = 0.1 mol * 8.314 J/mol.K * 773.15 K / 50 kPa = 0.8 m^3
The final volume of the steam is 0.8 m^3, which is an increase of four times the initial volume. This expansion is due to the heat added to the steam, causing the steam molecules to move faster and occupy a larger volume.
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Mike jumps 1.00 meters down onto a concrete walkway. His downward motion stops in 0.02 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?a. 15,500Nb. 7,010Nc. 4,900Nd. 3,500N
The force transmitted to mike's leg is 39200N. So option A is correct.
To calculate the force transmitted to Mike's leg bones, we can use the formula:
force = mass x acceleration
We can calculate the acceleration using the formula:
a = (fv - iv) / t
fv is the final velocity (0 m/s since his downward motion stops)
iv is the initial velocity (we can assume it to be 9.8 m/s, the acceleration due to gravity)
t is the time it takes for his downward motion to stop (0.02 seconds)
So,
a = (0 - 9.8) / 0.02 = - 490 m/s^2
The mass of Mike is not given in the question, so we can assume it to be 80 kg, as a typical human mass.
force = mass x acceleration = 80 x (-490) = - 39200 N
The negative sign indicates that the force is in the opposite direction of the acceleration, but since the question is asking for the force exerted on the bone, the negative sign can be ignored.
So the force transmitted to Mike's leg bones is 39200 N
So, the correct answer is option A. 39200N
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12. A pitcher throws a baseball with a velocity of 27 m/s. After being struck by a bat the ball travels in
the opposite direction with a velocity of 40 m/s. If the ball has a mass of 0.11 kg and is in contact
with the bat for 3.0 ms, the magnitude of the average force exerted by the bat on the ball is
0.99 KN
4.8 kN
a.
b.
C.
2.5 kN
d. 7.4 kN
Answer:i don't understand what to do will you try to make it more understandable
Explanation:
Select the correct answer. In the absence of friction, gravity, and all other external forces, what kind of speed will an object display if it travels from the bottom to the top of an inclined plane
Constant speed will be displayed if the object travels from the bottom to the top of an inclined plane.
What is an inclined planes?
An inclined plane is a flat surface that is sloped at an angle. It is a simple machine used to reduce the amount of force needed to move an object from one level to another. The inclined plane works by taking advantage of the force of gravity, allowing the object to be moved up or down the slope with less effort. This simple machine can also be used to increase the distance an object can travel by moving it up and down the slope.
In the absence of friction, gravity, and all other external forces, an object traveling from the bottom to the top of an inclined plane will travel at a constant speed. This is because the total energy of the system is conserved, meaning that the kinetic energy of the object remains constant throughout its motion. The object will thus maintain its initial speed, which is determined by the angle of the inclined plane and the initial velocity of the object.
Therefore, Constant speed is the correct answer.
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one of the early hypotheses to explain the high redshifts of quasars is that quasars were ejected from galaxies at very high speeds. this idea was rejected, because no quasars with large blueshifts have been found. explain why we would expect to see quasars with both blueshifted and redshifted lines if they were ejected from nearby galaxies.
One of the first explanations for the high redshifts of quasars was that they were ejected from galaxies at extremely high speeds. Since no quasars with significant blueshifts have been discovered, this hypothesis was dismissed.
It explains why quasars with both blue shifted lines should be expected if they were ejected from neighboring galaxies. By calculating the quasar's redshift, one can determine how big the universe was in comparison to how big it is now. The quasars were identified to have significant radio emission but the appearance of stars.
At first, their visible light looked perplexing, but astronomers soon discovered that they had significantly greater redshifts than stars. Redshifts for the quasars in the currently available spectra range from 15% to over 96% of the speed of light.
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a 76 g arrow is fired from a bow whose string exerts an average force of 95 n on the arrow over a distance of 81 cm. what is the speed of the arrow (in m/s) as it leaves the bow?
The speed of the arrow as it leaves the bow can be 8.9 m/s.
What is speed?
Speed is the rate at which an object moves through space or time. It is a measure of how quickly an object can change its position or the distance it can travel in a given amount of time. Speed is usually measured in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). Speed can also be expressed as a fraction or as a percentage. Speed is a crucial factor in many activities, including sports, transportation, and communication. For example, a car's speed is important for safe and efficient travel, and an athlete's speed can determine the outcome of a race. Speed can also be used to measure the performance of computer processors, which are used in almost every modern device.
The calculatiuon is-
Speed = (Force x Distance) / (Mass x Gravity)
Speed = (95 N x 0.81 m) / (0.076 kg x 9.8 m/s2)
Speed = 8.9 m/s
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The wireless spectrum, as defined by the FCC, spans between which two frequencies?
a. 500 GHz
b. 300 GHz
c. 2 KHz
d. 9 KHz
The wireless spectrum, as defined by the FCC, spans between 9kHz and 300GHz option - a is correct answer.
What radio frequency is FCC?Between 9 and 3000 GHz
The FCC controls radio frequency (RF) components found in electrical and electronic products that can emit radio frequency energy through radiation, conduction, or other means. The radio frequency range between 9 kHz and 3000 GHz is where these products could potentially interfere with radio services.
The radio spectrum is the region of the electromagnetic spectrum that corresponds to radio frequencies (RF). The Federal Communications Commission (FCC) and National Telecommunications and Information Administration are each responsible for a portion of the radio spectrum's regulatory oversight in the United States (NTIA).
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Complete question " The wireless spectrum, as defined by the FCC, spans between which two frequencies?
9 kHz and 300 GHz
125 kHz and 150 GHz
3 kHz and 500 GHz
3 MHz and 300 GHz".
