By knowing how intensity relates to distance, we will see that at 4 meters of the engine the intensity is 80.
How sound intensity relates to distance?
The sound spreads in a solid angle like all waves, so the intensity of the sound will decrease with the distance squared, this means that:
[tex]I = \frac{P}{4*pi*r^2}[/tex]
Where P is the sound power, we know that when the student is at 8m from the engine, the intensity measured is 20 (it does not tell the units) so we have:
[tex]20 = \frac{P}{4*3.14*(8m)^2} \\\\P = 20*4*3.14*(8m)^2 = 16,078.8 m^2[/tex]
Now, if you move 4 meters closer to the engine, your new position will be:
r = 4m
Then we have:
[tex]I = \frac{16,078.8 m^2}{4*3.14*(4m)^2} = 80[/tex]
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Answer:
80 is the answer! 100% CORRECT!
Explanation:
~Hope this helps! :)
Which of the following is a scientific question?
A. Which rowing boat hull design will meet Olympic specifications?
B. Which rowing boat hull design will sell the best?
Ο Ο O
C. Which rowing boat hull design will feel best to row?
D. Which rowing boat hull design will create the least drag?
Which of the following statements best summarizes the main points of the passage?
Answer:the summery is ...i really don't know the picture is blurry and I cant see can you make it clear?
Explanation:
A letter that describes the shape of a typical mountain valley:
The side of a stream: The bottom of a stream:
Given what we know, we can confirm that the letter V is often used to describe the typical shape of a mountain valley, while stream bank and stream bed described the side and bottom of a stream respectively.
What terms do we use to described streams?As shown in the question, there are many ways to describe the different parts of a stream. The side of the stream is referred to as the bank of the stream, along its entire length, while the stream bed is a term used to describe the bottom.
Therefore, we can confirm that the letter V is often used to describe the typical shape of a mountain valley, while stream bank and stream bed described the side and bottom of a stream respectively.
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Adam and kevin are roommates. Adam can clean their apartment in 45 minutes. Kevin can clean it in 60 minutes. Rounded to the nearest minute, how much time will it take if they work together?.
If they work together, required time to clean the apartment will be 26 minutes.
What is time and work problems in mathematics?
Time and work are concerned with the amount of time it takes a person or a group of people to complete a task and the effectiveness of the work performed by each of them.
Given parameters:
Adam can clean their apartment in 45 minute
Kevin can clean it in 60 minutes.
So, in 1 minute, Adam can clean 1/45 part of their apartment.
and, in 1 minute, Kevin can clean 1/60 part of their apartment.
If they work together, in 1 minute, they can clean = (1/45 + 1/60) part of apartment.
=(4+3)/180 part of apartment.
= 7/180 part of apartment.
Hence, if they work together, the apartment can be cleaned in 180/7 minutes, that is, in 26 minutes.
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Crystallization of solids
Answer:
A separation technique to separate solids from a solution. Crystallization can be defined as the process through which the atoms/molecules of a substance arrange themselves in a well-defined three-dimensional lattice and consequently, minimize the overall energy of the system.
Explanation:
Answer:
Crystallization of solidsExplanation:
What is Crystallization?Crystallization is a technique used for the purification of substances. A separation technique to separate solids from a solution.
Crystallization can be defined as the process through which the atoms/molecules of a substance arrange themselves in a well-defined three-dimensional lattice and consequently, minimize the overall energy of the system. When a substance is subjected to crystallization, its atoms or molecules bind together through well-defined angles.
On adding a solid substance in a liquid and stirring it, the solid dissolves in the fluid. But when adding more and more solid to the liquid, a point comes after which no more solid dissolves in the liquid. This point is called a saturation point and the fluid is called a saturation solution.
Key words and phrases:
saturation, crystallization, solids, liquids, substance, atoms, molecules, saturation solution, saturation point, purification, separation, solution, dissolve
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A 5.0 kg Foucalt Pendulum swings at the end of a 4.0 m long cable. The pendulum is released from a height of 1.5 m above the lowest position of its swing. What is the maximum tension in the cable?
Hi there!
We can begin by solving for the pendulum's velocity at the bottom of its trajectory using the work-energy theorem.
Recall:
[tex]E_i = E_f[/tex]
Initially, we just have Potential Energy. At the bottom, there is just Kinetic Energy.
[tex]PE = KE\\\\[/tex]
Working equation:
[tex]\large\boxed{mgh = \frac{1}{2}mv^2}[/tex]
Rearrange to solve for velocity:
[tex]gh = \frac{1}{2}v^2\\\\v = \sqrt{2gh}\\\\v = \sqrt{2(9.8)(1.5)} = 5.42 \frac{m}{s}[/tex]
Now, we can do a summation of forces:
[tex]\Sigma F = T - W[/tex]
The net force is the centripetal force, so:
[tex]\frac{mv^2}{r} = T - W[/tex]
Rearrange to solve for tension:
[tex]T = \frac{mv^2}{r} + W\\\\T = \frac{5(5.42^2)}{4} + 5(9.8) = \boxed{85.75 N}[/tex]
Predict what would happen to the volume of a gas if the pressure on that gas were doubled and then the absolute temperature of that gas were doubled.
The new volume of the gas will remain the same.
Data obtained from the question Initial pressure (P₁) = PInitial temperature (T₁) = TInitial volume (V₁) = VNew pressure (P₂) = 2PNew temperature (T₂) = 2TNew Volume (V₂) =? How to determine the new volumeThe new volume of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(PV) / T = (2P × V₂) / 2T
Cross multiply
T × 2P × V₂ = PV × 2T
2PT × V₂ = 2PVT
Divide both side by 2PT
V₂ = 2PVT / 2PT
V₂ = V
Thus, the new volume will remain the same
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If the pressure on a movable piston of a closed container is doubled, what will happen?.
If the pressure on a movable piston of a closed container is doubled, the volume of gas will decrease.
What is boyle's law?
Boyle's law states that if the temperature of a gas sample is constant, the volume of the sample will vary inversely as the pressure.
This means an increase in pressure will lead to a decrease in volume, also a decrease in volume will lead to an increase in pressure.
Therefore, when the pressure on the piston is doubled, the gas moves downward in the piston until the pressure produced by the gas equals the pressure produced by the piston. At this point, the volume of the gas will be reduced.
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A student calculates the density of a copper cube to be 4.15 g/cm . If the accepted value is 8.64 g/cm the percentage error in his
experimental value is
The percentage error in his experimental value is -51.97%.
What is percentage error?This is the ratio of the error to the actual measurement, expressed in percentage.
To calculate the percentage error of the student, we use the formula below.
Formula:
Error(%) = (calculated value-accepted value)100/(accepted............. Equation 1From the question,
Given:
Calculated value = 4.15 g/cmaccepted value = 8.64 g/cmSubstitute these values into equation 1
Error(%) = (4.15-8.64)100/8.64Error(%) = -4.49(100)/8.64Error(%) = -449/8.64Error(%) = -51.97 %
Hence, The percentage error in his experimental value is -51.97%.
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A person uses a pulley with 95%-efficiency and puts 50 J of work into the pulley. What is the output work?
Answer:
47.5J
Explanation:
just find 95% of 50
Acceleration and Force
Calculate the average acceleration of a car that changes speed from 0 m/s to 15 m/s in 5 s.
Answer:
I'm pretty sure its 3m/s^2 for the acceleration but I don't know the force part sorry .
Explanation:
15m/s - 0m/s divided by 5 s = 3m/s
I'm no expert or anything so I could be wrong but this is the best I can give you. Sorry
A person burns 2000 J of energy running 50 meters in 17 seconds at a constant velocity. What was the average force they applied?
the average force they applied is
A cheesemonger uses a Newton meter to measure the weight of a block of cheese. The cheese has a weight of 5.0 N. What is the mass of the cheese? A) 5.0 kg B)0.5 kg c)0.05 kg D)50 kg
Answer:B ,0.5
Explanation:M=w/g
M=5/10
M= 0.5kgkg
Can anyone explain alpha decay?
Explain beta decay
Explanation:
Beta decayRadioactive decay
In nuclear physics, beta decay is a type of radioactive decay in which a beta particle is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide
Answer:
In alpha decay, mass number of the nucleus decreases by 4 unit and atomic number is decreased by 2 unit. Alpha decay : ZAX→Z−2A−4Y+24He. When a parent nucleus emits an electron (beta particle) along with the daughter nucleus, then the nuclear reaction thus is called as beta decay.
150J of heat energy
are required to raise the
temperature of 100g block of metal by 5°c. What is the
specific heat capacity of the metal ?
Btu/(lb-°F) J/(g-°C i mean this is the correct answer
Answer:
0.300 J/(g*C)
Explanation:
Specific heat has a unit that describes the amount of heat (J) is required to raise a unit mass (g) by 1 degree temperature (C), It should take the form of J/(g*C) if we stick with the metric units provided in the question. Be aware that specific heat can be written in many different formats, all equivalent, but with differing measures. Examples:
(BTU/kgC)
kJ/(mole*K)
J/(g*C)
and so on. The specific heat for a material can be expressed in any of these formats. There are all equivalent, just expressed with different units.
--------------
In this problem: (150J)/[(100g)*(5C)] = 0.300 J/(g*C)
An accurate value of specific heat may be used for identification of the metal. The closest I found is Barium (0.290 J/(g*C) and Zinc (0.388 J/(g*C)
What are the high points are called and what are the lower points called ?
Answer:
High Points = Crest
Low Points = Troughs
Explanation:
Find the pressure exerted by a force 8000 newton's on an area of 25m^2. Give your answer in newton's/n^2
The pressure exerted by this force is equal to 320 [tex]N/m^2[/tex].
Given the following data:
Force = 8000 Newton.Area = 25 [tex]m^2[/tex].To calculate the pressure exerted by this force:
How to calculate pressure.Mathematically, pressure is given by this formula:
[tex]P=\frac{F}{A}[/tex]
Where:
P is the pressure.F is the force.A is the area.Substituting the given parameters into the formula, we have:
[tex]P = \frac{8000}{25}[/tex]
P = 320 [tex]N/m^2[/tex].
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A car advertisement states that a car can accelerate at 2 m/sec. The car starts from rest and accelerates to 70 km/hr. How much time does it take to accelerate to 70 km/hr.
Answer:
9.72s
Explanation:
[tex]\pink{\frak{Given}}\begin{cases}\textsf{ A car starts from rest.}\\\textsf{It has an acceleration of 2m/s$^2$.}\\\textsf{ The final velocity of the car is 70km/hr.}\end{cases}[/tex]
Here we need to find out the time that the car took to achieve the velocity of 70km/hr after starting from rest . Firstly convert the final velocity in m/s by multiplying it by 5/18 , as ,
[tex]\longrightarrow\sf 70km/hr = 70 \times \dfrac{5}{18} m/s =\bf 19.44\ m/s [/tex]
As we know that the rate of change of velocity is known as acceleration , so ;[tex]\longrightarrow\sf a =\dfrac{v - u}{t} [/tex]
Plug in the respective values ,
[tex]\longrightarrow\sf 2m/s^2 = \dfrac{ 19.4 m/s -0m/s}{t} \\ [/tex]
Simplify ,
[tex]\longrightarrow\sf 2m/s^2 =\dfrac{19.4m/s}{t} [/tex]
Cross multiply ,
[tex]\longrightarrow\sf t = \dfrac{19.44m/s}{2m/s^2} [/tex]
Simplify
[tex]\longrightarrow\sf \boxed{\bf t = 9.72 s} [/tex]
Hence the required answer is 9.72s.The froghopper holds the title of the best jumper of the animal world. A 0.0198-gram (1.98 X 10-5 kg) froghopper can accelerate from 0m/s to 4m/s in only one one thousandth of a second (0.001 s) as it jumps. What is the force delivered to the froghopper as it makes this jump?
This question involves the concepts of Newton's Second Law of Motion.
The force delivered to the froghopper as it makes the jump is "0.0792 N".
NEWTON'S SECOND LAW OF MOTIONAccording to Newton's Second Law of Motion whenever an unbalanced force is applied to an object, acceleration is produced in it in the direction of the force. Mathematically,
F = ma
where,
F = Force delivered to the grasshopper = ?m = mass of the grasshopper = 1.98 x 10⁻⁵ kga = acceleration = [tex]\frac{\Delta v}{t}[/tex]Δv = change in velocity = 4 m/s - 0 m/s = 4 m/st = time = 0.001 sTherefore,
[tex]F= ma = m\frac{\Delta v}{t}\\\\F = (1.98\ x\ 10^{-5}\ kg)(\frac{4\ m/s}{0.001\ s})\\\\[/tex]
F = 0.0792 N
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how does the refrigerator facilitie in the kitchen works
Answer:
Hope this helps
Explanation:
The fundamental reason for having a refrigerator is to keep food cold. Cold temperatures help food stay fresh longer. The basic idea behind refrigeration is to slow down the activity of bacteria which all food containsso that it takes longer for the bacteria to spoil the food.
What will happen to the temperature of boiling water if more heat is applied?.
Answer:
when the increase of temperature to water the steam is the water evaporated so over time when more heat is applied the more is evaporate so less water
А man runs 20 km west is hows. He then runs 20km 60° north or west 2.5 hours. what's the average velocity the Runnner?
Explanation:
[tex]\large{ \star \fcolorbox{magenta}{purple}{ \fcolorbox{magenta}{blue}{ \fcolorbox{magenta}{pink}{ \fcolorbox{magenta}{red}{ \sf{ añswër}}}}}} \star[/tex]
8km/hWhat is the relationship between the mass and the density of an object with the same volume?
Answer:
Density is mass per unit volume.
The relationship between density and volume is directly proportional
You might say that this experiment was an attempt to build a scale, and then calibrate it against a scale that we trust (the electronic scale). So as not to give away the answer to the preceding question, let's assume that we're talking about a different scale with the same design. Several trials are conducted, and the average and 95% confidence interval are calculated. The mass determined using this other balance scale does NOT agree with the mass measured on a digital scale. Is it possible that the balance scale and the electric scale are accurate, and the lack of agreement was just random?
Answer:
yes
Explanation:
No.
Since repeated measurements are taken and the average and 95% confidence interval are calculated, the possibility of the lack of agreement being a random error has been minimized or even eliminated.
What is a random error?Random error is defined as the deviation of the total error from its mean value due to chance.
Random errors can result from the instrument not being precise or from mistakes by the researcher.
Random errors can be minimized by taking multiple readings and averaging the results.
Since repeated measurements are taken and the average and 95% confidence interval are calculated, the possibility of the lack of agreement being a ransom error has been minimized.
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write the equation that links distance, force and work done??
Answer:
[tex]{ \boxed{ \rm{workdone = force \times distance}}}[/tex]
In a study of momentum during collisions, a student threw an egg at a large sheet of cloth that was suspended from a line and observed that the egg did not break during the collision. A second egg, thrown with similar force at a suspended concrete block, did break on impact. Why did the first egg survive the collision while the second egg did not survive?.
From the law of conservation of momentum, the first egg did not break because it forward momentum is transferred to the cloth while the second egg broke, the block exerts an opposite force equal to the momentum of the egg on the egg.
MomentumMomentum is the product of the mass of an object and its velocity of motion.
The law of conservation of momentum states that the momentum of an isolated system of colliding bodies is conserved.
When an egg is thrown on a large sheet of cloth suspended, the egg does not break because the momentum of the egg is transferred to the cloth as it is depressed.
However, a second egg, thrown with similar force at a suspended concrete block, did break on impact because the block does not move forward, instead it exerts an equal but opposite force on the egg resulting in the egg breaking.
Therefore, from the law of conservation of momentum, the first egg did not break because it forward momentum is transferred to the cloth while the second egg broke, the block exerts an opposite force equal to the momentum of the egg on the egg.
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A horse is trotting along pulling a sleigh through the snow. To move the 225 kg sleigh straight ahead at a constant speed, the horse must pull with a force of 123N.
a. What is the net force acting on the sleigh?
b. What is the coefficient of kinetic friction between the sleigh and the snow?
Answer:
a) The net force acting on the sleigh is zero because it is moving at a constant speed.
b) [tex]F_{fr}= \mu mg = F_{pull}[/tex], then [tex]\mu = \frac{F_{pull}}{mg} = 0.0557[/tex].
A person pushes a box. He applies a force of 400 newtons, and he pushes the box for adistance of 4 meters. After he stops pushing, the box slides forward another meter. How muchwork was done by the person?
Answer:
its however much he did before it slid another meter.
Explanation:
what are the big 5 equations for physics
v is velocity, x is position, t is time, and a is acceleration.
An elevator is moving down with an acceleration of 3.36 m/s2.
What would be the apparent weight of a 64.2-kg man in the elevator?
Answer : 413.44N
Here it is given that an elevator is moving down with an acceleration of 3.36 m/s² . And we are interested in finding out the apparent weight of a 64.2 kg man . For the diagram refer to the attachment .
From the elevator's frame ( non inertial frame of reference) , we would have to think of a pseudo force. The direction of this force is opposite to the direction of acceleration the frame and its magnitude is equal to the product of mass of the concerned body with the acceleration of the frame . When a elevator accelerates down , the weight recorded is less than the actual weight .From the Free body diagram ,
[tex]\sf\longrightarrow Weight = mg - ma \\[/tex]
[tex]\sf\longrightarrow Weight = m ( g - a ) \\[/tex]
Mass of the man = 64.2 kg[tex]\sf\longrightarrow Weight = 64.2( 9.8 - 3.36) N\\[/tex]
[tex]\sf\longrightarrow Weight = 64.2 * 6.44 N\\[/tex]
[tex]\sf\longrightarrow \underline{\boxed{\bf Weight_{apparent}= 413.44 N }} \\[/tex]
