if 5ev of energy is supplied to an electron with a binding energy of 2.3ev, with what kinetic energy is [tex]\Rightarrow \mathrm{KE}=5-2.3=\mathbf{2 . 7} \mathrm{eV}[/tex]
What is kinetic energy?
The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes.
Photoelectric effect: The photoelectric effect is a phenomenon where electrons are ejected from a metal surface when the light of sufficient frequency is incident on it. These ejected electrons are called photoelectrons.
- When a photon falls on the metal surface, the photon's energy is transferred to the electron.
- Some part of the energy gets utilized in removing the electron from the metal surface, and the remaining goes into giving kinetic energy for the ejected electron.
- Work function [tex](\phi)[/tex]: It is the minimum amount of energy required to cause photo-emission of electrons from a metal surface when light is incident on it.
- Einstein's Photoelectric Equation gives the relationship between work function[tex](\phi)[/tex], the kinetic energy of the emitted electron, and the energy of the photon [tex](E)[/tex]
[tex]$$E=\phi+K E$$[/tex]
Given that:
Energy of incident light, [tex]E=5 \mathrm{eV}[/tex]
Work function,[tex]$\phi=2.3 \mathrm{eV}$[/tex]
Using Einstein's Photoelectric Equation,
[tex]$$\begin{aligned}& \mathrm{E}=\phi+\mathrm{KE} \\& 5=2.3+\mathrm{KE} \\& \Rightarrow \mathrm{KE}=5-2.3=\mathbf{2 . 7} \mathrm{eV}\end{aligned}$$[/tex]
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a hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. which bullet will hit the ground first? a. the dropped one. b. the fired one. c. both hit at the same time. d. not enough information to determine.
A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal and simultaneously dropping another bullet from the level of rifle, then the bullet that will hit the ground first is : a.) the dropped one.
What is the meaning of projectile motion?Projectile motion is a form of motion experienced by an object that is projected in a gravitational field, such as from Earth's surface, and then moves along a curved path under the action of gravity.
The motion of an object thrown or projected into the air, subject to only the acceleration of gravity is called projectile motion.
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the circulated fluid cools the engine and releases heat through the radiator. the type(s) of heat transfer involved in the process is (are)
Conduction is a heat transfer method. This heated antifreeze is circulated to the radiator via a water pump. Convection is the term for this method of thermal energy transfer.
What is called radiator?Radiators are heat exchangers that transfer heat for cooling and heating from one medium to another. The majority of radiators are designed to function in vehicles, structures, and electronics.
What is the function of radiator and does radiator needs water or not?A radiator aids in the engine's overheating removal. It is a component of the engine's cooling system, which also consists of a fan, hoses to circulate the coolant, a liquid coolant, and a thermostat to track the coolant temperature.
If you absolutely must continue driving, you can add water to the radiator to get you to your destination, even though it's best to add a 50/50 mix of coolant and water (or a pre-mixed coolant).
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adding solar panels to the roof that add heat to the inside of the cat house a
answers:
radiation
convection
conduction
Thermal energy from the solar rays heats the black paper. Through conduction, it warms the air in the box's. The warm air circulates inside the box due to convection, preventing it from escaping.
Solar panels: Do they reflect heat from the roof?Researchers at the UC San Diego Jacobs School of Engineering found that solar panels significantly reduced the amount of heat that reached roofs, keeping them 5 degrees cooler than roof areas that were directly exposed to sunshine.
Is installing solar on your roof worthwhile?Installing solar panels on your home is worthwhile if you reside in a region with high energy costs, a sufficient solar rating, and if you have the initial financial means to do so.
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PLEASE HELP - WILL GIVE BRAINLIEST.
Objects 1 and 2 attract each other with a gravitational force of 72.0 units. If the distance separating Objects 1 and 2 is changed to one-half the original value (i.e., halved), then the new gravitational force will be ____ units.
Answer: 288.0 units.
Explanation: If the distance between two objects is halved, the gravitational force between them will be increased by a factor of 4. So if the original gravitational force between Objects 1 and 2 was 72.0 units, the new gravitational force will be 72.0 * 4 = 288.0 units.
Answer: If the distance separating Objects 1 and 2 is halved, then the new gravitational force will be 288.0 units.
Explanation:
a lamp of mass m hangs from a spring scale which is attached to the ceiling of an elevator. when the elevator is stopped at the fortieth floor, the scale reads mg. what does it read as the elevator slows down to stop at the ground floor?
Your brain sends electrical impulses to the remainder of your body through your nerves, which act as cables.
How do medical professionals test for nerve damage?CT or MRI scans can check for cancers, herniated discs, pinched (compressed) nerves, blood vessel abnormalities, and other conditions affecting the bones and blood vessels. testing of nerve function. Your muscles' electrical activity is captured by electromyography (EMG), which can identify nerve damage.
How is nerve injury treated?Your surgeon has two options for nerve repair: either remove the injured portion & reconnect healthy nerve ends, or implant a stretch of nerve from another area of your body (nerve graft). Your nerves can regrow with the aid of these therapies.
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Which of the following are signs that an endothermic reaction is taking place
Answer:
positive delta H (enthalpy/heat change)
temperatures drop
Explanation:
eg water changing state to ice is an endothermic reaction
Answer:
Some signs that an endothermic reaction is taking place are if:
- the container holding the reaction feels cold to the touch
- the change in enthalpy is positive
- the total heat of formation is positive
an object travels 20 m in 4s and then another 16m in 2s. what is the average speed of the object?
The average speed of the object is calculated as 6 m/s, when distance travelled by object and time taken are given.
What is an average speed?Average speed is calculated by dividing total distance that something has travelled by the total amount of time it took to cover that distance. Average speed measures the average rate of speed of a trip.
As we know, Velocity V = Distance / time
Distance travelled in first half, D1 = 20 m
Time taken in first half, T1 = 4 seconds
Distance travelled in second half, D2 = 16 m
Time taken in second half, T2 = 2 seconds
Average speed of an object = (D1+D2)/(T1+T2)
= 36 / 6
Average speed of object = 6 m/s
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calculate the friction force of a 65 kg person if the coefficient of friction for the ground is 0.47
Answer:
299.39N
Explanation:
F=un
n=w=mg⇒ (65)(9.8)=637
0.47(637)= 299.39 N
*your teacher/prof may expect you to round to sig figs*
how much energy is stored in a 3.00- cm -diameter, 12.0- cm -long solenoid that has 150 turns of wire and carries a current of 0.790 a ?
According to the given statement the energy is stored in Long solenoid is U = 2.14 × 10⁻⁶ J.
Why is energy such a big deal?Energy is a crucial part of our everyday life although becoming an basic human need. The buildings that people have constructed are heated and cooled by energy. To raise a foot, get out of couch, or even simply walk and along main path, you need energy.
Briefing:
The diameter of the solenoid is given as 3cm or 0.03m.
The length of the solenoid is given as 12cm or 0.12m.
Current is given as 0.79A
The cross-sectional area of the solenoid is
A = πd²/4
A = π (0.03)²/4 = 0.000225m²
Inductance of the solenoid can be found out using the below formula,
L = μ₀ N² A/l
where, μ₀ is vacuum permeability
N is number of turns
A is cross-sectional area
l is length
L = μ₀ N² A/l
L = 4π × 10⁻⁷ * (150)² *0.000225/0.79 = 8.05 × 10⁻⁶ H
U = 1/2 L*i²
U = 0.5 * 8.05 × 10⁻⁶ * (0.73)²
U = 2.14 × 10⁻⁶ J
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. a makeup mirror has radius of curvature 54 cm. how far is the upright image from your face if it is 6 times larger?
It is 22.5 cm far the upright image from your face if it is 6 times larger, when radius of curvature is given.
What is a concave mirror?Concave mirror has a reflective surface that is curved inward and is away from the light source and it reflects light inward to one focal point.
Given radius of curvature=54 cm
Focal length= r/2
= 54/2
=27 cm
v is the distance to the virtual image and u is the distance of the object in front of the mirror.
Given v = -6u
As we know that ; 1/f = 1/u +1/v
So now, 1/f = 1/u - 1/6u
= 5/6 u
∴ u = 5f/6= (5* 27)/6
u = 22.5 cm
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What is the frequency of a wave that has a speed of 0.5 m/s and a wavelength of 0.050 meter?
0.5 hertz.
0.008 hertz
20 hertz
10 hertz.
The frequency of the wave is 10 hertz.
What is frequency?
In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time.
After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration.
For wave motion, it can be written that:
Velocity of wave = wavelength × frequency
Frequency = Velocity of wave/wavelength
Given that Velocity of wave = 0.5 m/s.
wavelength = 0.050 meter.
Hence, frequency of the wave = 0.5/0.050 hertz
= 10 hertz.
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Why do organisms make different proteins? The Darwin’s bark spider on the left makes proteins that result in spider silk with high flexibility. The Darwin’s bark spider on the right makes proteins that result in spider silk with low flexibility. Using the space below, explain why you think this happens.
Organisms make different proteins because of the gene recombination and genetics.
What is the genetics of spider silk?Siblings may inherit various features from their parents and from each other depending on the specific gene combinations that each seeds carries. The variance in silk inflexibility among spider seed is explained by random gene recombination.
The inflexibility of silk is another issue. This point is shared by all of Darwin's dinghy spiders (they all have spider silk with some flexibility), yet some spiders create silk that is more flexible than other spiders' silk. There are three levels of silk inflexibility - high, medium, and low.
The above explanation about the genetic recombination tells about why the organisms make different proteins.
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Aluminum reacts vigorously and exothermically
with copper chloride which of the following is the balanced equation for this reaction
Aluminum reacts vigorously and exothermically with copper chloride, the balanced chemical reaction becomes:
2Al + 3CuCl₂ → 2AlCl₃ + 3Cu
Why Aluminum reacts vigorously with copper chloride?Considering that aluminium is a more active metal in the electrochemical series of metals than copper, it displaces copper from the bond. The result is the emission of gaseous hydrogen and red metallic copper. This reaction is quite intense and results in the production of heat.
The reaction between aluminium and copper(II) chloride is highly vigorous, as heat is generated, the reaction mixture becomes very hot, the blue hue owing to the Cu(II) ions fades, the aluminium foil disintegrates, a reddish brown solid emerges, and gas bubbles are released.
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How much time i required for a elevator to lift a load if the motor can produce 13,000 W of power and doe total work of 56000 J?
The time needed for the elevator to lift the load is approximately 4.31 seconds.
What is the time required?Power is simply the amount of energy transferred per unit time.
It is expressed as;
P = W / t
Where P is power, W is work done and t is time.
Given the data in the question;
Power P = 13000W = 13000J/sWork done W = 56000 JTime t = ?Plug the given values into the above formula and solve for t
P = W / t
P = W / t
t = W / P
t = 56000J / 13000J/s
t = 4.31 s
Therefore, the required time is 4.31 seconds.
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groundwater originates from snowmelt and , which seeps into the surface of earth.
Groundwater originates from precipitation and snowmelt, which seeps into the surface of the Earth.
Most groundwater is derived as meteoric water from precipitation in the form of snow or rain. If it is not lost by transpiration, evaporation, or stream runoff, water from these sources generally infiltrates into the ground.
Initial amounts of water from precipitation onto dry soil are held very tightly as surface films and in the micropores of the particles of soil. At intermediate levels, water films cover the solid particles, but the air is still present in the voids of the soil. This region is called the zone of aeration or unsaturated zone, and the water present is known as vadose water. At lower depths and in presence of sufficient amounts of water, all such voids are filled to give a zone of saturation, the upper level of which is the water table. Water present in this zone of saturation is known as groundwater
Although a part of your question is incorrect, you might be referring to this question:
Groundwater originates from and snowmelt, which seeps into the surface of the Earth.
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Write the formula of the compound magnesium phosphate, in which the magnesium ion has a charge of 2+ and the phosphate ion has a charge of 3-.
Mg2(PO4)3
Mn2(PO4)3
Mn3(PO4)2
Mg3(PO4)2
The chemical formula of the Mg²⁺ and PO₄³⁻ is Mg₃(PO₄)₂. Therefore, option (4) is correct.
What is the chemical formula?A chemical formula provides information about the proportions of each element in a given chemical compound or molecule. The chemical formula includes chemical symbols, numbers (subscripts), and other symbols, such as dashes, plus (+) and minus (−) signs, commas, and brackets.
The chemical formula of a compound includes no words but can draw simple chemical structures. In chemistry, two kinds of formulas for any compound: empirical formula and molecular formula.
The charge on the Magnesium is +2 and the charge on the phosphate ion is -3. Therefore, the formula of the compound magnesium phosphate is Mg₃(PO₄)₂.
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What are all the terms that could be used to describe the wave that is produced when a person speaks?
Answer:
Sound
Amplitude Wave
Pitch
Strenght
Explanation:
Use this free body diagram to help you find the magnitude of the force F1 needed to keep this block in static equilibrium.
Static equilibrium means that all forces are equal, so to make this easiest you want to break F1 into it's horizontal and vertical components. As there are no other forces acting in the horizontal, we know the horizontal component of F1 is 40N.
What is static equilibrium ?Dynamic equilibrium is a state in which bodies are moving at a constant speed as opposed to static equilibrium, which is a state in which bodies are at rest (rectilinear motion). The total amount of forces exerted on them in both situations is zero.
When two forces are acting on an object that is in static equilibrium, it indicates that their sum is zero, which makes static equilibrium a useful analytical tool. You may create an equation to figure out the direction and strength of the unknown force if you know the direction and strength of one of the forces.
Thus, Static equilibrium means that all forces are equal, so to make this easiest you want to break F1 into it's horizontal and vertical components.
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a fairground ride spins its occupants inside a flying-saucer-shaped vehicle. if the horizontal circular path the riders follow has a radius of 6.5 m, at how many revolutions per minute will the riders be subjected to a centripetal acceleration 1.65 times that due to gravity?
The riders make 15.09 rev/min when they are subjected to a centripetal acceleration 1.65 times that due to gravity.
Given that,
Radius of circular path = 6.5 m
Let ω be the angular velocity of ride
Centripetal acceleration is given by ω²r
which should be equal to gravity 1.65* (g)
ω²r = 1.65* g
ω² = (1.65* g)/r
ω = √(1.65* g/r) = √(1.65* 9.81/ 6.5) = 1.58 rad/sec
We know that, 1 rad/sec = 9.55 rev/min
So, converting rad/sec to rev/min we have,
ω = 1.58* 9.55 = 15.09 rev/min
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why not turn car your engine off to save gas while waiting to pickup your husband, but keep the car turned on so the air conditioning, lights, and radio keep running without the engine?
It doesn't matter if you turn off the AC first or after you turn off the engine; someone once said that doing so would shock the system. It still stops abruptly whether it shuts off from the switch or the engine.
Does turning off your car while waiting save gas?Turning it off can help you conserve gasoline and cut down on carbon dioxide emissions, unless you drive a classic automobile with a carburetor. Our research has shown that drivers can save fuel and cut pollutants by shutting down for periods as little as 10 seconds. Some drivers believe that idling burns less fuel than resuming.
More gasoline is used and more CO2 is released when an engine is left idle for more than 10 seconds (Figure 3). For passenger cars of various sizes, idling fuel consumption ranges from 0.2 to 0.5 gal/h and rises with idling speed. Driving causes the car to warm up more quickly than idle does.
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two masses, m1 and m2 are separated by a distance, r. the force of attraction between the two masses is f. if r is cut by 1/4, how would f change?
If the distance between the masses is cut by 1/4, the new force will become 16 times the old force.
What is the force experienced by the two masses?The force experienced by the two masses is determined by applying Newton's law of universal gravitation.
F = Gm1m2 /r²
where;
G is universal gravitation constantm1 is mass of the first objectm2 is mass of the second objectr is the distance between the two masseswhen the distance between the objects becomes 1/4, the new force between the object becomes;
F = Gm1m2 /(1/4 r)²
F = Gm1m2 /(1/16)r²
F = 16 [ Gm1m2 /r² ]
F (new) = 16 (Gm1m2 /r² )
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what is the source of heat for most hot springs and geysers, and how is this reflected in the distribution of these features?
Geothermal heat is the source of heat for most hot springs and geysers.
Geothermal heat, or heat that originates from deep within the Earth, heats hot springs. Water may come into touch with extremely hot rock heated by magma in volcanic zones. Hot springs in volcanically active areas may create superheated water that is so hot than immersion can be dangerous or fatal. The temperature of rocks within the Earth also rises with depth in non-volcanic regions; this temperature rise is known as the geothermal gradient. Water can generate hot springs if it percolates far enough through the crust, coming into contact with hot rocks along the way.
The most well-known geothermal feature is a geyser. Due to intricate interior plumbing, each geyser has distinct characteristics. In a location of volcanic activity, geysers often demand that vast volumes of groundwater fill subsurface cavities. These deep caverns' water is warmed by neighbouring magma. Suddenly, a portion of the water turns to steam and rapidly expands. An burst of heated air and steam forces the suspended in the water column violently out of the vent. Repeating this cycle is possible frequently. Yellowstone National Park contains Old Faithful, a geyser that has been erupting once in every 65 minutes for centuries.
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what is the wavelength (in m) of an earthquake that shakes you with a frequency of 11.5 hz and gets to another city 80.0 km away in 12.0 s?
The wavelength of earthquake that shakes you with frequency of 11.5 Hz and gets to another city 80 Km away in 12s is 579.72 m .
The Wavelength is defined as the distance between adjacent crests in adjacent cycles of a waveform signal propagated along a wire .
the relation between velocity , wavelength and wavelength is :
v = λf ;
simplifying we get ⇒ λ = v/f ;
we know that , v = d/t ; by speed = distance × time ,
substituting , distance = 80 Km = 80000 m, and
time taken = 12s ;
So , v = 80000/12 = 6,666.7 m/s .
given that frequency(f) = 11.5 Hz ,
So , λ = v/f ⇒ 6,666.7/11.5
= 579.71304
≈ 579.72 m .
Therefore , the wavelength of the earthquake is 579.72 m .
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for the photoelectric effect, indicate the expected observations for a particle theory of light and for a wave theory of light.
The discovery that many metals release electrons when exposed to light is known as the photoelectric effect.
What aspect of particle theory is doing the photoelectric effect support?Because it behaves like an impactor (one that preserves mechanical power) involving two particles, the photons of sunlight and the electrons of the metal, the photoelectric effect fits a particles theory of light.
What is the light particle theory?Albert Einstein did, however, give his particles theory of light a boost in 1905. He noticed the photoelectric phenomenon, wherein ultraviolet light hitting a surface causes the surface to liberate electrons. By characterizing sight as a flow of photons, or energetic packets, Einstein was able to describe the response.
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What is the formula for Gravitational Potential Energy (GPE)?
Answer: GPE = MGH
Explanation:
M = Mass
G = Gravitational acceleration(9.8m/s^2 on Earth)
H = Height
Answer:
GPE=mgh
Explanation:
m - mass
g - gravitational force
h - height
The smith family is travelling in their car at 50 km/h due east. Mr. Smith is using cruise control to maintain a constant speed. Describe the net force acting on the smith car.
Answer:
The net force would be zero
Explanation:
Since, F = m*a
So, if the speed is constant, similarly if we include direction the Velocity is constant and that means that acceleration is zero as acceleration itself is change in velocity per time so constant velocity and since,
a = (Vf - Vi)/change in time
a = 0
then
F = m*0
so F is also zero
how much heat is required to completely melt a 4.6-kg block of ice having a temperature of 252.2 k? cice
The heat required to completely melt the block of ice is 15.18 * [tex]10^{5}[/tex] J
What is the heat required for melting?The mass of ice = m = 4.6 kg
The Latent heat = [tex]L_{f}[/tex] = 3.3 *[tex]10^{5}[/tex] J/kg
Heat required to melt the ice =Q
[tex]Q = mL_{f}\\ Q = 4.6 * 3.3 * 10^{5} \\ Q =15.18 * 10^{5}J[/tex]
What is Latent heat?Latent heat is energy that a body or thermodynamic system releases or absorbs during a constant-temperature process, typically a first-order phase transition. Latent energy and heat of transformation are other names for it.Latent heat can be thought of as energy that is provided or removed in a concealed form in order to alter a substance's state without altering its temperature. Latent heat of fusion and latent heat of vaporization, which are involved in phase shifts when a substance condenses or vaporizes at a particular temperature and pressure, are two examples. In contrast to latent heat, sensible heat is energy that is conveyed as heat and causes a change in a body's temperature.To learn more about Latent heat, refer:
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How does the average pressure f an elephant standing on the ground compared to that exerted by a person standing on the ground? The person weighs 640N. each shoe has an area of about 0.016 m^2 in contact with the floor. The elephant weighs 4.13x10^4N and has four feet, each with an area of about 0.14 m^2 in contact with the ground.
(a) The average pressure exerted by the person is 40,000 N/m².
(b) The average pressure exerted by the elephant is 295,000 N/m².
The average pressure exerted by the elephant is about 7 times greater than the average pressure exerted by the person.
What is average pressure exerted by the elephant and person?The average pressure exerted by each is defined as the force per unit area.
Mathematically, the formula for average pressure is given as;
P = F/A
where;
F is the applied forceA is the area of each objectP = W / A
where;
W is weight of the personA is the area of surface in contactThe average pressure exerted by the person is calculated as follows;
P = (640 N) / (0.016)
P = 40,000 N/m²
The average pressure exerted by the elephant is calculated as follows;
P = (4.13 x 10⁴ N) / (0.14)
P = 295,000 N/m²
Thus, the average pressure exerted by the elephant and the person depends on their weight and area of their shoes.
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You lift a relatively light bowling ball with your hand, accelerating it upward. What are the forces on the ball? what forces does the ball exert? what objects are these forces exerted on?
The forces on the ball are the force of your hand and the gravitational force of Earth's mass. The ball exerts a force on your hand and a gravitational force on Earth. All these forces are exerted on your hand, on the ball, or on Earth.
What is acceleration?
Compared to displacement and velocity, acceleration is like a raging fire-breathing dragon of motion variables. it can be violent. Some people fear it. And when it's big, you have to be careful. Taking off an airplane, braking a car, cornering a go-kart at high speed are all sensations of acceleration.
Acceleration is the name we give to any process that changes velocity. Velocity is speed and direction, so there are only two ways to accelerate. Either change speed, change direction, or change both.
No matter how fast you run, you can't accelerate unless you change speed and direction. So a jet traveling along a straight line at a constant speed of 800 miles per hour will not accelerate even though it is traveling very fast because its speed does not change. When the jet lands and comes to a sudden stop, it accelerates while decelerating.
Therefore, The forces on the ball are the force of your hand and the gravitational force of Earth's mass. The ball exerts a force on your hand and a gravitational force on Earth. All these forces are exerted on your hand, on the ball, or on Earth.
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Drag each label to the correct location.
Sort the characteristics of states of matter based on whether they change.
Changes;
Volume of a gas
Shape of a liquid
Shape of a gas
Does not change;
Volume of a solid
Shape of a solid
Volume of a liquid
What are the states of matter?In our introductory science lessons, we must have leant that matter is any thing that has mass and occupy space. We know that matter can occur in three states of matter and these are the solid, liquid and gaseous stage of matter.
Now we know that a liquid has a definite volume but does not have a definite shape. The gas on the other hand does not have a definite shape and a definite volume. It takes the shape and the volume of the container where it is found.
A solid would always retain in itself, a definite shape and a definite volume. This is why the solid is not compressible but the liquid and the gas are compressible.
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