2565Ns is the impulse applied to the ball by the racket when a 57 g tennis ball is served at 45 m/s velocity and the ball started from rest.
What is impulse?The integral of a force, F, across the time period it acts on is called an impulse. An ordinary mechanical quantity is the impulse. Impulse is a vector quantity because force is one as well.The general formula for impulse is J = Δp Unit of the impulse is defined as Ns (Newton-seconds).Solution:Given :
The mass of tennis ball=57g
velocity applied =45m/s
Now to find the impulse applied to the ball by the racket;
The general formula for impulse is J = Δp
⇒J = Δp ∵ (Δp=mΔv )
∴ J = mΔv
Now substituting the values
J=57*45
J=2565Ns
Hence, 2565Ns is the impulse applied to the ball by the racket when a 57 g tennis ball is served at 45 m/s velocity and the ball started from rest.
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What are the two factors that influence gravitational force?.
Answer: Mass and Distance from the center of mass
Explanation:
The source mass that is causing the gravitational pull, and the distance a test mass is away from the origin of the center of mass
Anxiety disorders can become a pathological disorder when feelings of apprehension and fear __________.
a. are recurrent for less than six months
b. are inherited due to genetics
c. become excessive, uncontrollable, and affect daily life
d. are controllable but excessive
please select the best answer from the choices provided a b c d
When feelings of anxiety and worry become excessive, out of control, and interfere with daily life, they can develop into pathological diseases called anxiety disorders. So the correct option is (c).
Anxiety disorders are characterized by feelings of apprehension and fear, which are normal human emotions. However, when these feelings become excessive, uncontrollable, and affect daily life, they can be considered a pathological disorder. Anxiety disorders can affect a person's ability to perform daily activities, such as work or school, and can also cause physical symptoms such as insomnia, muscle tension, and fatigue. These disorders can be recurrent, but they need to be excessive, uncontrollable, and affect daily life in order to be considered pathological.
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if you are in a car that is being pulled down a 56.0m path with a force of 12.5n what is the work done on the car
Answer: work done is: 700 J.
the formula of work done is : work=force × distance
here, the distance car being pulled is 56.0 m and the force applied on it is 12.5 n. so the work done to pulled a car id : = 12.5 × 56.0
=700.0 j.
if we compare light photons and energetic electrons which have constant velocity independent of energy
Light photons always travel at a constant speed (the speed of light) regardless of their energy, while the velocity of electrons is not constant and can vary with their energy.
Light photons and energetic electrons do not have constant velocities independent of energy. Light photons, which are particles of electromagnetic radiation, travel at a constant speed in a vacuum, which is approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum, denoted as the speed of light (c). This speed is a fundamental constant of nature and remains constant regardless of the energy of the photons. In other words, all photons, regardless of their energy, travel at the same speed in a vacuum.
On the other hand, energetic electrons do not have a constant velocity independent of their energy. According to classical physics, the velocity of an electron can vary depending on its energy. In classical mechanics, the kinetic energy of an object is related to its velocity. However, in the microscopic world of quantum mechanics, the behavior of particles such as electrons is described differently.
In quantum mechanics, the concept of particle velocity becomes less straightforward. Instead of velocity, quantum particles are described by wavefunctions, which represent the probability distribution of finding the particle at a certain location. The wavefunction of an electron evolves over time according to the Schrödinger equation, and it does not directly correspond to a well-defined classical velocity.
However, in certain situations, such as in electron beams or particle accelerators, electrons can be accelerated to high energies. In these cases, the energy of the electrons is related to their speed, but it is not a constant relationship. As the energy of the electrons increases, their speed can also increase, but it is not independent of their energy.
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Importance of least count
Answer:
Least count of an instrument is one of the very important tools in order to get accurate readings of instruments like vernier caliper and screw gauge used in various experiments. Least count uncertainty is one of the sources of experimental error in measurements.
how much pressure is applied to the ground by a 109 kg man who is standing on square stilts that measure 0.06 m on each edge? answer in units of pa.
The pressure applied to the ground by a 109 kg man standing on square stilts that measure 0.06 m on each edge is: 59.935 Pa.
This can be calculated using the formula Pressure = Force/Area.
First, calculate the Force.
Force = Mass x Acceleration due to gravity, so Force = 109 kg x 9.8 m/s2 = 1072.2 N.
Next, calculate the Area.
Area = Length x Width, so Area = 0.06 m x 0.06 m = 0.0036 m2.
Finally, use the Pressure formula:
Pressure = Force/Area, so Pressure = 1072.2 N / 0.0036 m2 = 59.935 Pa.
To summarize, the pressure applied to the ground by a 109 kg man standing on square stilts that measure 0.06 m on each edge is 59.935 Pa.
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A shark is cruising at 4 m/s when it sees a fish straight
ahead. The shark increases its speed to 9 m/s in 2
seconds. How far does the shark travel in this time?
Answer:
Distance, S = 13m
Explanation:
Given the following data;
Initial velocity, u = 4m/s
Final velocity, v = 9m/s
Time, t = 2 seconds
To find the distance, S;
First of all, we would determine the acceleration of the shark.
Acceleration = (v - u)/t
Acceleration = (9 - 4)/2
Acceleration = 5/2
Acceleration = 2.5m/s²
Now, to find the distance we would use the second equation of motion
S = ut + ½at²
Substituting into the equation, we have
S = 4(2) + ½*2.5*2²
S = 8 + 1.25*4
S = 8 + 5
Distance, S = 13m
the coefficient of static friction between teflon and scram- bled eggs is about 0.04. what is the smallest angle from the hori- zontal that will cause the eggs to slide across the bottom of a teflon-coated skillet?
The smallest angle from the horizontal that will cause the eggs to slide across the bottom of a teflon-coated skillet is approximately 2.3 degrees.
Calculating the maximum angle of static friction yields the minimal angle that will cause an item to slide. The coefficient of static friction between two objects is defined as the ratio of the maximal frictional force to the normal force. The maximal frictional force is denoted as follows:
f_max = friction coefficient * normal force
The normal force is equal to the weight of the object, and can be represented as follows:
N = m * g
where m is the mass of the object, and
g is the acceleration due to gravity (\(9.8 m/s^2\)).
We can then use the maximum frictional force to find the maximum angle of static friction, using the equation:
tan(\(\theta_{max}\)) = \(f_{max} / N\)
The minimum angle that will cause an object to slide is equal to the maximum angle of static friction.
Given that the coefficient of static friction between teflon and scrambled eggs is 0.04,
we can find the minimum angle that will cause the eggs to slide as follows:
\(tan(\theta_{min}) = 0.04 = f_{max} / (m \times g)\)
Solving for \(\theta_{min}\), we find:
\(\theta_{min} = tan^{-1(0.04)}\)
= 2.3 degrees (to the nearest tenth of a degree)
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Why is using fossil fuels considered unsustainable?
Answer:
Fossil fuels take millions of years to replenish
Answer:
Fossil Fuel is limited it is like coal there is a limit and it won't last forever. This also contributes that it is not safe for the environment as well as the safety and health of people. This is similar to when there are many factories around an area there is going to be a high percentage of respiratory diseases such as asthma.
2. The speed of truck is 39 m/s. How long does it take for the truck to travel 9,000 m?
Answer:
\(\boxed {\tt 230.769231 \ seconds}\)
Explanation:
Time can be found by dividing the distance by the speed.
\(t=\frac{d}{s}\)
The distance is 9,000 meters and the speed is 39 meters per second.
\(d= 9,000 \ s\\s=39 \ m/s\)
Substitute the values into the formula.
\(t=\frac{9,000 \ m}{39 \ m/s}\)
Divide. Note that the meters, or "m" will cancel out.
\(t=\frac{9,000}{39 \ s}\)
\(t=230.769231 \ s\)
It takes 230.769231 seconds for the truck to travel 9,000 meters at 39 meters per second.
what does it mean to have a good experimental design?
Answer: Experimental design means creating a set of procedures to test a hypothesis. A good experimental design requires a strong understanding of the system you are studying. By first considering the variables and how they are related (Step 1), you can make predictions that are specific and testable (Step 2).
Explanation:
For the circuit shown in the figure, the current in the 8 resistor is 0.50 A, and all quantities are accurate to 2 significant figures. What is the current in the 2 resistor?
The current through the 2Ω resistor is 9.5A
The terminal voltage is 10.8 V
How to calculatea) The voltage V across 8 Ω resistor is V = I*R = 8*0.5 = 4V
the current through 16Ω resistor is then I = V/R = 4/16 = 0.25 A
the current through 20Ω resistor is then I = current through 8Ω resistor + current through 16Ω resistor = 0.75 A
voltage across 20Ω is V = I*R = 0.75*20 = 15 V
the source voltage is Vs = V8 + V20 = 4+15 = 19 V
therefore the current through 2Ω resistor is
I = V/R = 19/2 = 9.5 A
b) The terminal voltage is
Vterminal = VR = I*R = 0.450*24 = 10.8 V
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Which type of chemical reaction results in the absorption of energy? a. combustionb. exothermicc. replacementd. endothermic
The absorption of energy occurs in endothermic reactions. The correct option is D.
What is an endothermic reaction?The type of chemical reaction that results in the absorption of energy is endothermic. In an endothermic reaction, energy is absorbed from the surroundings, resulting in an increase in the internal energy of the system.
This means that the products of the reaction have more energy than the reactants, and the reaction requires an input of energy to proceed.
Examples of endothermic reactions include the reaction of baking soda and vinegar, the melting of ice, and the reaction of ammonium nitrate and water.
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If a galaxy is located 200 million light years from Earth, what can you conclude about
the light from that galaxy?
A. The light will travel a total of 200 million kilometers to reach Earth.
B. The light will travel 200 million kilometers per second to reach Earth.
C. The light will travel a total of 300,000 kilometers to reach Earth.
D. The light will take 200 million years to reach Earth.
please help :(
Answer:
D
Explanation:
It's quite simple actually, you see, what light years basically means is how many years light takes to travel from point a to point b. So here it says that a galaxy is 200 million light years away. So since that light is 200 million years away, it would take 200 million years until that light reaches us.
20 POINTS:
Why does the initial hill of a roller coaster need to be steep?
Answer: A roller coaster does not have an engine to generate energy. The climb up the first hill is accomplished by a lift or cable that pulls the train up. This builds up a supply of potential energy that will be used to go down the hill as the train is pulled by gravity
Hope this helps! Good luck with future homework and exams!
Two trains sound identical horns of frequency 410 Hz. One train is stationary. The other is moving away from an observer, who heats a beat frequency of 35 Hz. How fast is the moving train going?
The speed of the moving train is approximately 33.5 m/s.
The beat frequency is given by the difference in frequency between the two horns, which is equal to the Doppler shift in frequency due to the motion of the moving train. Using the formula for the Doppler effect, we can solve for the speed of the train:
\(f_b = f_s\dfrac{(v + v_o)}{(v + v_s)}\)
where \(f_b\) is the beat frequency, \(f_s\) is the horn frequency, v is the speed of sound, \(v_o\) is the observer's speed, and \(v_s\) is the speed of the source.
We know that \(f_s\) = 410 Hz and \(f_b\) = 35 Hz. The speed of sound in air at standard temperature and pressure is approximately 343 m/s. Since the observer is stationary, \(v_o\) = 0.
Solving for \(v_s\), we get:
\(v_s = \dfrac{(f_s + f_b)}{f_s - 1} \times v\)
\(v_s\) = ((410 Hz + 35 Hz) / 410 Hz - 1) * 343 m/s
\(v_s\) = 33.5 m/s
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saturn's cloud layers are much thicker than those of jupiter because saturn has:_____.
Saturn's cloud layers are indeed much thicker than those of Jupiter primarily because Saturn has a lower surface gravity compared to Jupiter. The thickness of a planet's cloud layers is influenced by factors such as the strength of gravity and atmospheric composition.
Saturn is less massive than Jupiter, and as a result, its gravitational pull is weaker. This lower surface gravity allows Saturn's cloud layers to extend farther from the planet's core, creating thicker cloud decks. The weaker gravity allows the atmospheric gases to spread out over a greater distance, resulting in a more extended and thicker cloud layer. The atmospheric composition of Saturn also plays a role. Both Jupiter and Saturn have predominantly hydrogen and helium atmospheres, but Saturn contains a higher proportion of heavier compounds like ammonia, methane, and water vapour. These compounds contribute to the condensation and formation of thicker cloud layers in Saturn's atmosphere. Therefore, the combination of Saturn's lower surface gravity and its atmospheric composition leads to the formation of much thicker cloud layers compared to Jupiter. Saturn's cloud layers are much thicker than those of Jupiter because Saturn has lower gravity than Jupiter, allowing for the clouds to spread out and form thicker layers in its atmosphere.
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The wiring in a house must be thick enough so it doesn't become so hot as to start a fire. What diameter must a copper wire be if it is to carry a maximum current of 38 A and produce no more than 1.4 W of heat per meter of length?
A copper line with a diameter of 2.1 mm has a maximum current capacity of 38 A and a maximum heat output per metre of 1.4 W.
To determine the diameter of the copper wire, we need to use the following formula:
Power = (Current)^2 x Resistance
We can rearrange this formula to solve for resistance:
Resistance = Power / (Current)^2
We also know that the resistance of a wire is given by:
Resistance = (Resistivity x Length) / Area
where resistivity is a material constant for copper, and length and area are the length and cross-sectional area of the wire, respectively.
We want to find the diameter of the wire, so we need to express the area in terms of the diameter. The cross-sectional area of a wire is given by:
Area = π/4 x Diameter^2
Combining these equations, we get:
Power / (Current)^2 = (Resistivity x Length) / (π/4 x Diameter^2)
Solving for Diameter, we get:
Diameter = sqrt((4 x Resistivity x Length x Power) / (π x Current^2))
Now we can plug in the given values:
Maximum current, I = 38 A
Maximum power per meter, P = 1.4 W/m
Resistivity of copper, ρ = 1.72 x 10^-8 Ωm (at 20°C)
We want to solve for the diameter, so we need to choose a length. Let's assume we are considering a wire that is 10 meters long.
Substituting these values, we get:
Diameter = sqrt((4 x 1.72 x 10^-8 Ωm x 10 m x 1.4 W/m) / (π x (38 A)^2))
Diameter ≈ 2.1 mm
Therefore, a copper wire with a diameter of 2.1 mm can carry a maximum current of 38 A and produce no more than 1.4 W of heat per meter of length.
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If the magnitude of a vector is√8 .If it's x-component is 2 ,then it's y- component is
Answer:
The answer is below
Explanation:
A vector quantity is a quantity that has both magnitude and direction. The magnitude of a vector is the length of that vector.
The magnitude of a vector a with a x component of x and y component of y is given by the formula:
\(|a|=\sqrt{x^2+y^2}\)
Given that the vector has a magnitude of √8, the x component is 2 and the y component = y. Hence:
\(\sqrt{8}=\sqrt{2^2+y^2}\\\\squaring\ both\ sides:\\\\8=4 + y^2\\\\y^2=8-4\\\\y^2=4\\\\square\ root\ of\ both\ sides:\\\\y=\sqrt{4} \\\\y=\pm 2\\\\y=+2\ or\ y=-2\)
HELLLP! PHYSICAL SCIENCE GUYS THANK YOU!!
The dimensions of the disk of our milky way galaxy are:.
Answer:
According to studies, the milky way is approximately, "170,000–200,000 light-years (52–61 kpc) in diameter and, on average, approximately 1,000 ly (0.3 kpc) thick."
With that being said, it is safe to say that the dimensions are somewhere around 100,000 by 1,000
which of the filling is a result of the transfer of energy?
answer: sound
why is it sound???
Explanation:
the speed of sound depends on the particles of the medium of the sound wave is moving through because the particles in the solid and tightly packed together South Wales weekly transfers energy from particle to particle in a solid
The car in the diagram travels west with a forward acceleration of 0.22 m/s2. What was the car’s velocity (vi) at point xi if it travels a distance of 350 m in 18.4 s?
17.01 m/s is the car’s velocity .
s=ut+at²/2
s-at²/2=ut
u=s-at²/2÷t
u=312/18.4
u=17.01 m/s
"The rate at which an item changes its location" is described by a vector number called velocity. Imagine someone walking swiftly, one step forward, one step back, and starting each step from the same location. Velocity is a vector quantity. Therefore, velocity is cognizant of direction. The direction must be taken into account when determining an object's velocity. A velocity of 55 miles per hour is not adequate information. It is necessary to account for the direction in order to accurately describe the object's velocity. Simply put, the direction of the velocity vector represents the motion of the object.
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________ was the first astronomer to track sunspot movement with the aid of a telescope.
Galileo Galilei was the first astronomer to track sunspot movement with the aid of a telescope. His observations played a significant role in the development of our understanding of the Sun.
Galileo, an Italian astronomer and physicist, made his groundbreaking sunspot observations in 1610-1613. Using the newly invented telescope, he was able to see that the Sun had spots on its surface that appeared to move over time. Prior to Galileo's discovery, the prevailing belief was that the Sun was a perfect, unblemished sphere. His observations challenged this notion and contributed to a broader shift in our understanding of the cosmos.
Galileo's work on sunspots not only provided evidence of the Sun's imperfect surface but also demonstrated that the spots were connected to the Sun and not separate objects, as some had previously thought. By observing the movement of sunspots, Galileo was able to determine that the Sun rotates on its axis, further solidifying the idea that celestial bodies were not static and unchanging.
In summary, Galileo Galilei's groundbreaking observations of sunspots with the aid of a telescope marked a turning point in our understanding of the Sun and the broader universe. His work challenged the existing beliefs of his time and paved the way for future astronomers to further explore and understand our solar system.
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When a system fails it _____ our other systems causing us to be sick.
A. connects
B. repairs
C. affects
D. structures
Answer:
c) affects
Explanation:
im like 90% sure
8. Calculate the total resistance in a series circuit with a fan (3 ohms) and 3 lights (1 ohms each). 9 ohms O 12 ohms 15 ohms 06 ohms
Answer:
R_eq = 6 Ω
Explanation:
In a series circuit the current is constant throughout the circuit and the resistance is the sum of all the resistances in it.
R_eq = ∑
in this case we have
R_eq = R₁1 + 3 R₂
where R₁ is the resistance of the fan and R₂ the resistance of each light, we must clarify that we will assume that the resistance of the lights does not change with temperature
let's calculate
R_eq = 3 + 3 1
R_eq = 6 Ω
Answer:
6 ohms
Explanation:
a gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. when 254 kcal of heat is added to the gas, the volume is observed to increase slowly from 12.0 m3 to 16.2 m3 . Calculate the work done by the gas and the change in internal energy of the gas.
Upon absorbing 254 kcal of heat, a gas contained in a cylinder kept at atmospheric pressure sees a rise in volume from 12.0 m3 to 16.2 m3. The work performed by the gas is -1.01 × 10⁵ Kcal, and the internal energy has changed by -1.01 × 10⁵ Kcal
The volume of a gas contained in a cylinder at atmospheric pressure (P = 101325 Pa) increases from 12.0 m³ to 16.2 m³.
The following phrase can be used to determine the work (w) that the gas has performed.
w = -P × ΔV = -101,325 Pa × (16.2 m² - 12.0 m²) = -4.26 × 10⁵ J × 1kcal/4181J = -1.02 × 10⁵ Kcal
The gas receives 254 kcal of heat, making q equal to 254 kcal. The following phrase can be used to determine how the internal energy (E) has changed.
ΔE = q + w = 254 Kcal + (-1.02 × 10⁵ Kcal) = -1.01 × 10⁵ Kcal
When a gas is contained in a cylinder that is kept at atmospheric pressure, it absorbs 254 kcal of heat, increasing its volume from 12.0 m³ to 16.2 m³. The gas expends -1.02 × 10⁵ kcal of effort, and the internal energy changes by -1.01 × 10⁵ kcal.
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A resistor with a 15.0-V potential difference across its ends develops thermal energy at a rate of 327 W.
Part A
What is its resistance?
Part B
What is the current in the resistor?
The resistor has a resistance of 0.688. 21.8 A of current flow via the resistor.
What is the difference in potential between a resistor's ends?Resistance is the name given to the proportional constant. We now know that resistance rises as temperature rises. So, if a resistor's temperature is constant, we may deduce that the potential difference at its ends is directly proportional to the current flowing through it.
R = V²/P
R = (15.0 V)²/327 W = 0.688 Ω
Using Ohm's Law, which states that V = IR, where V is the potential difference, I is the current, and R is the resistance, we can rearrange to solve for I:
I = V/R
I = 15.0 V/0.688 Ω = 21.8 A
Therefore, the current in the resistor is 21.8 A.
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Basic elements for every contract include
1) an offer,
2) acceptance,
3) ___________,
4) with legal capacity, for a legal purpose
The basic elements for every contract include
1) an offer,
2) acceptance,
3) Awareness
4) with legal capacity, for a legal purpose
What is a contract?A contract is an agreement between two or more parties, to perform a specific job or duty. A contract is usually temporary or of fixed duration and usually governed by a written agreement.
The basic elements every contract should contain are as follows:
An offer, which encompasses the duties and responsibilities of each partyAcceptance; the offeree must decide whether to accept or reject the proposal/offer. Awareness; for a contract to be binding, the involved parties must first be aware that they are entering into an agreementLegal capacity; all contracts are subject to the laws of the jurisdiction in which they operateLearn more about contract at: https://brainly.com/question/2669219
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true or false? The electric field is always directed in the direction from a lower electric potential to a higher electric potential.
Answer:
true
Explanation:
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