Disregard absorption. The threshold of hearing is 10^-12 W/m2.The formula used to calculate the intensity of sound isI = I₀(r₀ / r)², Where I₀ = 10^-12 W/m² r₀ = 1 m, and r = distance from the source of sound. A decibel level of 40.4 dB indicates that the sound's intensity level is 10^ (40.4/10) times more than the threshold of hearing.
I = I₀ × 10^(dB/10)I = 10^-12 × 10^(40.4/10)I = 2.512 × 10^-8 W/m².
Let, x be the distance from the door where the sound's intensity level is barely audible.
I₀(r₀ / x)² = 2.512 × 10^-8W/m²(r₀ / x)² = 2.512 × 10^-8 / I₀(r₀ / x)² = 2.512 × 10^-8 / 10^-12(r₀ / x)² = 2.512 × 10^4r₀² / x² = 2.512 × 10^4x² = r₀² / 2.512 × 10^4x = r₀ / sqrt(2.512 × 10^4)x = (1 m) / sqrt(2.512 × 10^4)x = 0.02 m or 2 cm.
Therefore, the distance at which the music is just barely audible to a person with a normal threshold of hearing is 2 cm from the door.
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Please show your complete solution of these questions.
(THOSE WHO ANSWERED WITH COMPLETE STEPS WILL BE MARKED AS BRAINLIST)
Answer:
11520
Explanation:
6.4×1800 wich is kw × 30 minutes in seconds
The air in the balloon had a mass of 0.00320 kg
The temperature of the air in the balloon decreased by 215 °C
The change in thermal energy of the air in the balloon was 860 J
Calculate the specific heat capacity of the air in the balloon.
The specific heat capacity of the air in the balloon is 125.88 J/kg °C.
What is specific heat?Specific heat is the amount of energy required to raise the temperature of a unit mass of a substance by one degree. It is measured in joules per kilogram Kelvin (J/kgK). Specific heat is an important physical property of a substance, as it determines how much energy is required to change its temperature. It is also used to calculate the amount of energy released or absorbed during a chemical reaction. Specific heat is also known as heat capacity, and is often used to compare the heat capacity of different materials.
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of the substance by 1 °C.
To calculate the specific heat capacity of the air in the balloon, we can use the equation:
Q = m * c * ΔT
Where Q is the change in thermal energy, m is the mass of the air, c is the specific heat capacity, and ΔT is the change in temperature.
Rearranging the equation, we get:
c = Q / (m * ΔT)
Plugging in the values given, we get:
c = 860 J / (0.00320 kg * 215 °C)
c = 860 J / (0.0068 kg °C)
c = 125.88 J/kg °C
Therefore, the specific heat capacity of the air in the balloon is 125.88 J/kg °C.
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a light bulb is 40% efficient. if it is supplied with 1000 joules of electrical energy, how many joules of light does it emit
The amount of energy emitted by the light bulb is 600J.
How to calculate efficiency?Efficiency is the extent to which a resource is used for the intended purpose; the ratio of useful work to energy expended.
According to this question, a light bulb is 40% efficient. If it is supplied with 1000 joules of electrical energy, the amount of energy emitted can be calculated as follows:
40% of 1000J = 400J of energy used.
This means that 1000J - 400J = 600J of energy will be emitted.
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A metal phere with a ma of 8. 00 kg ocillate at the end of a vertical pring with a pring contant of 2. 40 ✕ 104 N/m. The motion i damped by air reitance, and the damping coefficient i b = 3. 00 N · /m
The frequency of the damped oscillation is 24.6 Hz
The equation for frequency of the damped oscillation is as follows:
f = (1 / (2 × π)) × √((k - (b² / 4 × m)) / m)
where "π" is a mathematical constant approximately equal to 3.1415, "k" is the spring constant, "m" is the mass of the sphere, and "b" is the damping coefficient.
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √(24000 - (3/32)) N/kg
f = (1 / (2 × π)) × √(23997) N/kg
f = (1 / (2 × π)) × 153.26 N/kg
f = 24.6 Hz
Therefore, the frequency of the damped oscillation is 24.6 Hz
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Your question seems to be missing, but I suppose the question was:
"A metal sphere with a mass of 8. 00 kg oscillate at the end of a vertical spring with a spring constant of 2. 40 ✕ 10^4 N/m. The motion is damped by air resistance, and the damping coefficient is b = 3. 00 Ns/m. Calculate the frequency of the damped oscillation."
The amplitude of pule A i 20cm and that of pule B i 10 Cm what i the maximum of the reultant pule
Maximum resultant pulse will be 22.36 cm, if the amplitude of pulse A is 20 cm, and that of pulse B is 10 cm.
Equations of two superimposing waves with a phase difference of π/2, are:
y₁ = a₁sin(ωt) and y₂ = a₂sin(ωt + π/2) = a₂cos(ωt)
The equation of the resultant wave will be:
y = y₁ + y₂
y = a₁sin(ωt) + a₂cos(ωt)
Assuming a₁ = acos(Φ), a₂ = asin(Φ)
So, y = asin(ωt+Φ)
(a₁)² + (a₂)² = a²(sin²Φ + cos²Φ)
(a₁)² + (a₂)² = a²
a = √((a₁)² + (a₂)²)
a = √(20²+10²)
a = √500
a = 22.36 cm.
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A 15. 0-kilogram mass is moving at 7. 50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11. 5 meters per second?.
The total work required to increase the speed of the mass to 11.5 meters per second is 67.5 Joules.
What is speed?Speed is the rate of motion, velocity, or the rate of change of position in a given period of time. It is a measure of how quickly an object or person moves from one place to another. Speed is usually measured in units such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). Speed is an important factor in many sports, such as running, cycling, swimming, and racing. It also plays a role in everyday activities such as driving, walking, and getting around. Speed is a key factor in safety, as it can help people stay ahead of potential risks and hazards.
The total work that must be done on the mass is given by the equation W = F x d,
Where W is the work done,
F is the net force applied,
and d is the displacement.
In this case, the displacement is the change in velocity, or 4.5 meters per second.
The force needed to accelerate the mass to 11.5 meters per second is given by the equation F = m x a,
where m is the mass (15 kilograms) and a is the acceleration (4.5 meters per second2).
Therefore, the total work required to increase the speed of the mass to 11.5 meters per second is W = 15 x 4.5 = 67.5 Joules.
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In both cases shown at right, an astronaut is a distance x from a moon. The two cases are identical except that in Case A there is a large planet directly between the astronaut and the moon.
a) Is the gravitational force on the astronaut by the moon greater in Case
A, greater in Case B, or the same in both cases? Explain your reasoning.
b) In which case will the astronaut have greater acceleration? Explain your reasoning.
The only exception is Mars, which is noticeably less brilliant at opposition compared to how apparent the other planets are on Earth.
Can astronauts see Earth?Numerous astronauts and cosmonauts have observed the Overview Effect, saying that when they view the Earth from space, it appears to be "a tiny, fragile ball of life dangling in the emptiness, sheltered and nourished by a paper-thin atmosphere."The first citizen of India to visit space is Rakesh Sharma. India's space mission made it the 14th country in the world to launch a man into space.Moons and planets within the solar system. … Jupiter, Saturn, Uranus, and Neptune, together known as the Jovian planets or big planets, are massive bodies with densities less than 2 grammes per cubic centimetre. Jupiter and Saturn are predominantly made of hydrogen and helium, while the other three are made of ice, rock, hydrogen, and helium (Uranus and Neptune).To learn more about planets refer to:
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VT 102.00 V, T = ?,
V₁?, 1₁=?, R₁= ?
V₂= 48.00 V, 12= ?, R₂= ?
V3= 40.00 V, 13?, R3- 19.00 Ohms
Solve for all the necessary parts of the circuit to answer the following question:
What is the current (I3) which is flowing through resistor three?
Your Answer:
RT
R₁ = ?
The current (I3) flowing through resistor three is not provided with the given information. To find the current, we would need the value of the total resistance (RT) which is not provided. Additionally, we would also need the value of R₁ and R₂ to calculate the total resistance.
What is resistor?A resistor is a passive electrical component that resists the flow of electrical current, reducing the current flowing through a circuit. They are often used to limit the current in a circuit, distribute power, or to adjust the voltage level in a circuit. They can be made of various materials such as carbon, metal film, and metal oxide, and are characterized by their resistance value measured in ohms (Ω).
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What does MLA 9 in-text citation look like?
MLA 9 in-text citation looks like: (Burke 3); (Best and Marcus 9); (Franck et al. 327).
In MLA 9th edition, in-text citations will be:
If there is only 1 author or no author; we only need the author's last name and the page number. As an example: (Burke 3).If there are 2 authors; we need to connect both authors' last names with and, and include the page number. As an example: (Best and Marcus 9).If there are 3 or More Authors; we have to use the first author's last name and et al., and include the page number. As an example: (Franck et al. 327)Learn more about MLA citation at: https://brainly.com/question/29548082
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Two airplanes are flying in the sky in such a way that gravitational attractions between them decreases. The planes must be flying away from each other.
According to the given statement The planes must be flying away from each other.
Why is gravitational attraction?It is a characteristic of things, of substance. All matter is drawn to all other matter, to put it simply. The stronger the attraction between things, the more substance there is, and also the closer together the items are. Gravity constantly draws objects together, unlike power and magnetism, which may either attract or repel.
Is the gravitational attraction a theory?Regarding the law of attraction, the concept of universal gravitation is a theory, not an established reality. It is important to approach this information with only an open mind and to thoroughly read through and think about it. In spite of the fact that it is not even a good hypothesis, the General Theory of Gravity is frequently taught in schools as truth.
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The complete question is -
Two airplanes are flying in the sky in such a way that the gravitational attractions between them decreases ?
in an electric generator a turning loop of wire placed between two permanent magnets causes electromagnetic induction in the wire. which sentence best explains the effect of the turning loop of wire in an electric generator.
The magnetic field between the magnets causes the charged particles within the wire to move.
Option D is correct
What is a magnetic field?A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
Faraday's law of electromagnetic induction sates that whenever their is a relative motion of a conductor is magnetic field, an emf will be induced in the conductor and the strength of the induced emf is directly proportional to the rate of change of magnetic flux linking the circuit.
Therefore, motion of the electrons is due to magnetic field created by the permanent magnet of the electric generator.
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Complete question:
In an electric generator a turning loop of wire placed between two permanent magnets causes electromagnetic induction in the wire. which sentence best explains the effect of the turning loop of wire in an electric generator.
A. The magnets cause charged particles within the wire to move as the poles of the magnets switch.
B. The moving electrons flow from the permanent magnets into the loop of wire.
C. The magnetic field of each magnet attracts the metal in the moving loop of wire.
D. The magnetic field between the magnets causes the charged particles within the wire to move.
Bill bye the science guy motion worksheet
A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the stone's trajectory time from the top of the cliff to the bottom to be 4. 3 s. What is the height of the cliff?.
By using kinematic equation, the height of the cliff would be 90.6 meters.
The kinematics equations are frequently used to analyze the free-falling motion of an object, in this case we are given that:
The time (t) = 4.3 seconds
Acceleration due to gravity (a) = 9.8 meters per second
Since we know that the time it takes for the stone to fall to the ground is 4.3 s, we can use the following formula to determine the height to which the stone will fall as a result of gravity:
x = v₀t + 1/2 at²
where x is the displacement, v is the velocity, t is the time, and a is the acceleration.
x = 0 + 1/2 (-9.8) (4.3)²
x = -90.6
As the result, the height of the cliff would be 90.6 meters.
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Starts at rest at 3m to the right after 10s he is traveling 2m/a to the left where does he end up
He ends up 17 meters to the left of the center position, according to the given question.
In physics, what is position?An object's location at any given time is known as its position (x), and its change in position is known as displacement. Both of these must be determined from the reference frame because they are vector values.
Suppose he is at a position which is 3 m. right from the center position
Given data :
Initial position = 3m to the right
Time = 10 sec.
Speed = 2m/s.
By using the formula -
speed = distance / time
distance = speed × time
distance = 2 × 10
distance = 20 m.
He end up at 17 m. to the left from the center position.
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The percentage of body weight that is made up of fat when compared to your other tissue, bone and muscles.
The percentage of body weight that is made up of fat when compared to your other tissue, bone and muscles is called body composition.
Body composition refers to the proportion of fat, muscle, bone, and other types of tissue in the body. It is often expressed as a percentage of body weight that is made up of fat. Body composition can be measured using various methods such as skinfold thickness measurements, bioelectrical impedance, and dual-energy x-ray absorptiometry (DXA).
A healthy body composition is generally considered to be one with a low percentage of body fat and a high percentage of muscle mass. It is important to note that body composition is not the same as body weight, as two individuals can weigh the same but have very different body compositions. An imbalance in body composition can lead to health issues such as obesity and increased risk of chronic diseases. Regular exercise and a healthy diet can help to maintain a healthy body composition.
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Help Needed
What is the M.A. (Mechanical Advantage) of a screwdriver with a radius from the center to the outermost edge of the tip of 50.0 mm, and the radius of the handle of 240 mm? Remember that there are 1000.0 mm in 1.0000 m, and while solving the problem show your work of course.
The mechanical advantage of the screwdriver is 0.208.
How to calculate mechanical advantage?Mechanical advantage is the ratio of the output force produced by a machine (especially a simple machine) to the applied input force.
The efficiency of a simple machine is determined by calculating their mechanical advantage (MA). Mechanical advantage is a measure of the force amplification attained by the machine.
According to this question, the screwdriver has a radius from the center to the outermost edge of the tip of 50.0 mm, and the radius of the handle of 240 mm. The mechanical advantage can be calculated as follows:
M.A = 50/240
M.A = 0.208
Therefore, 0.208 is the mechanical advantage of the simple machine.
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A Physical Education (gym) class is playing a game of soccer. During the game, the ball experiences a net force of 0 newtons. Which statement explains what is most likely happening with the ball?
When the ball experiences a net force of 0 newtons, its state of motion remains unchanged, that is, it will remain in rest or will move with same speed in same direction.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
As the ball experiences a net force of 0 newtons, it experiences balanced force and its state of motion remains unchanged.
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A fifty-car train going 25 meters per second took 150 seconds to stop. What is the acceleration/deceleration?
Deceleration of 1/6 m/s2
Initial Velocity(u) = 25m/s
Final velocity(v) = 0 m/s
Time taken in reaching velocity 0 (t) = 150 s
so as we know from the equation of 2 dimension motions that
v = u + at ....................... (Formula Used)So
0 = 25 + a*150-25 = 150aa= -25/150 ---> -1/6 m/s2As we know that the acceleration is negative so we can conclude that it is a deceleration of 1/6 meter per second square. In the given Question, the information of Fifty - car train has no use in solving acceleration or deceleration.
Acceleration is always Positive as it Increases the speed of the body but Deceleration is negative as it for reducing the speed.
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A concave mirror has a focal length of 18 cm. This mirror forms an image located 54 cm in front of the mirror. What is the magnification of the mirror? (Include the sign.)
magnification m = -v/u = -2
Concave mirrors can generate both real and virtual images. A virtual, magnified image of the object is produced when the concave mirror is positioned very near to it.
As the distance between the object and the mirror increases, the size of the image decreases and real images are produced. When an object's distance is less than the focal length in a concave mirror, the magnification will be higher than one. When the object's distance exceeds the focal length, the magnification is less than one.
Given focal length f = 18 cm
image distance v = 54 cm
then from lens equation
(1/f) = (1/u)+(1/v)
(1/18) = (1/u)+(1/54)
-(1/u) = (1/54)-(1/18)
object distance u = (18*54)/(18-54) = 27 cm
magnification m = -v/u = (-54)/(27) = -2
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Quartz and halite have different crystal shapes primarily because
answer choices
Light reflects from crystal surfaces
Energy is released during crystallization
Of impurities that produce surface variations
The internal arrangement of atom
Quartz and halite have different crystal shapes primarily because of the internal arrangement of atom.
Due to some reasons, quartz and halite have different crystal shapes. Primarily, the reasons are:
Both are formed from molten material.Both are composed of minerals.Both are produced by heat and pressure.The very distinct key characteristics that make us can easily observe and differ between quartz and halite is that quartz crystals always make a pointed pencil shape. It has 6 sides on terminal ends as resembling a prism. Furthermore, halite tastes like salt, because halite is salt. The other characteristics that we could use to differentiate between two of them is that a quartz crystal is hexagonal in cross section, meanwhile a halite crystal is square in cross section.
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IM SO CONFUSED
A billiards player hits the 0.17 kg cue ball so that it travels towards the stationary 0.16 kg 8-ball with a speed of 0.48 m/s. If the cue ball stops after the collision, what is the resulting speed of the 8-ball? What is the change in momentum of the cue ball? What is the change in momentum of the 8-ball?
In accordance with the conservation of momentum law the 8-ball's final speed after a collision is 0.51 m/s.
The momentum, what is it?momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both direction and magnitude.
Given data :
Mass of cue ball(m1) = 0.17 kg
Mass of 8-ball(m2) = 0.16 kg
Initial speed of cue ball (u1) = 0.48 m/s
Initial speed of 8-ball (u2) = 0 m/s
Final speed of cue ball (v1) = 0 m/s
Final speed of 8-ball (v2) = v2 m/s
The total momentum before and after a collision is equal, according to the conservation law of momentum.
Hence,
m1u1 + m2u2 = m1v1 + m2v2
0.17 × 0.48 + 0.16 × 0 = 0.17 × 0 + 0.16 × v2
0.0816 + 0 = 0 + 0.16v2
0.0816 / 0.16 = v2
0.51 m/s = v2
v2 = 0.51 m/s
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The rate at which a certain balloon travels is inversely proportional to the amount of weight attached to it if the balloon travels at 10 in./s and then there is a 2nd g weight attached to it approximately how much weight must be attached to the balloon for it to travel 18 in./s
The rate at which a certain balloon travels is inversely proportional to the amount of weight attached to it if the balloon travels at 10 in./s and then there is a 2nd g weight attached to it approximately the weight must be attached to the balloon for it to travel 18 in./s is 1.1 grams.
When 2 grams are added, the rate moves at 10 in/sec.
Since the weight and the distance traveled are inversely proportional, the expression can be written as
d= k/W
10 =k/2
k= 20
When 2 grams are attached, the rate moves at a speed of 10 in/second.
Given that the relationship between the weight and the traveled distance is inverse, this can be expressed as,
d= k/W
18= k/w
w= k/18
Substitute value of k in the above expression.
W= 20/18
W=1.11 gram
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A rocket blasts away from the earth with a cargo for the international space station. Sketch the graph of the force of gravity the rocket experiences from the earth as a function of time.
What is globalization
Answer: the process by which businesses or other organizations develop international influence or start operating on an international scale.
Explanation:
Answer:
Globalization is the free movement of goods, services and people across the world in a seamless and integrated manner. Globalization can be thought of to be the result of the opening up of the global economy and the concomitant increase in trade between nations.
hope that helps
Convert 800 km per hour to m/s.
Answer:
222.222m/s
Explanation:
Convert 800 km per hour to m/s
[tex] \frac{800km}{hr \\ } = \frac{800 \times 1000m}{60 \times 60sec} [/tex]
[tex] \frac{8 \\ 00000m}{3600s} [/tex]
[tex] = 222.22222 m {s}^{ - 1} [/tex]
i hope this helps
how does conductance change with charge density?
Smaller ions have greater conductivity than larger ions.
How does conductance change with charge density?The molar conductivity is the conductivity per mole: as the concentration grows, so does the number of charge carriers, and hence the conductivity. The molar conductivity would be constant if the quantity of ions scaled perfectly with the concentration of electrolyte.
However, the conductivity per ion decreases because ions do not act as totally independent charge carriers: they combine, and the rate at which they combine increases as the number of ions increases. This behavior leads to Kohlrausch’s Law (the law you mentioned at the beginning of your query), which is only applicable for strong (completely dissociated) electrolytes.
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Which phrases describe the formation of the Hawaiian Islands? Check all that apply.
formed due to subduction
formed in the middle of a plate
formed at a divergent boundary
formed at a convergent boundary.
formed where mantle erupts through crust
Formed due to subduction, formed at a convergent boundary, and formed where mantle erupts through crust.
What is subduction?Subduction is the geologic process in which one tectonic plate moves beneath another and is forced downwards into the mantle. It is an important part of plate tectonics, as it is responsible for the formation of mountain ranges and volcanism. Subduction occurs at convergent boundaries, where two plates come together, and is usually accompanied by earthquakes, as the plates grind and slide against each other. Subduction zones are the areas where this process is occurring, and they are typically found in the world's oceans, along the margins of the continental plates.
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What would probably happen if you tried to bake bread without using yeast?Why?
The thing that will probably happen if you tried to bake bread without using yeast is that dough may not rise as tall as you're used to because of the lackof the yeast composition in the dough.
What occurs if yeast is absent?Lemon juice and baking soda mixed in equal parts can be used as a substitute for yeast. So, if a recipe calls for 1 teaspoon of yeast, you can use 1/2 teaspoon each of baking soda and lemon juice. Remember that the dough will start rising immediately, and the bread won't need to prove for the usual amount of time.
You could find that your dough doesn't rise as much as usual and that the flavor and texture are different. However, these alternatives are definitely worth investigating if you run out of yeast, don't have time to wait for bread to rise, or are attempting to eliminate yeast from your diet for health reasons.
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Discribe the phrase "like dissolves like" in terms of polarity.
The phrase "like dissolves like" can be described as the compounds which have similar nature dissolve in each other that is polar dissolves polar and non-polar dissolves non-polar molecules.
What is Polarity?Polarity is the separation of electric charge which is leading to a molecule or the chemical groups which are having an electric dipole moment, with a negatively charged end and a positively charged end as well. Polar molecules are the molecules which must contain one or more polar bonds which occur due to a difference in the electronegativities between the bonded atoms of the molecule.
A simple way to predict the compounds which will dissolve in other compounds is the phrase of the compound such as "like dissolves like". This means that the polar compounds dissolve in polar compounds, and the nonpolar compounds dissolve in nonpolar compounds, however, the polar and nonpolar molecules do not dissolve in each other.
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A car accelerates uniformly from rest and
reaches a speed of 17.9 m/s in 9.6 s. The
diameter of a tire is 38 cm.
Find the number of revolutions the tire
makes during this motion, assuming no slip-
ping.
Answer in units of rev.
Answer:
Below
Explanation:
Find distance vehicle travels during this acceleration
d = vo t + 1/2 a t^2
a = change in velocity / change in time = 17.9/9.6 = 1.86458 m/s^2
vo = 0 ( it starts from rest )
then d = 1/2 ( 1.86458)* 9.6^2 = 85.92 meters
Now divide by the tire circumference to get the number of revs
85.92 m / ( .38 m * pi )/rev = ~ 71.97 revs
Answer: 64.5 rev. ✅
Explanation: The diameter of the tire is 38cm and the car accelerates uniformly from rest to reach a speed of 17.9m/s in 9.6s. The distance covered by the tire can be calculated by using the formula: distance = speed x time.
The distance covered by the tire is 17.9 x 9.6 = 171.84 meters. But when we convert it centimeters it is 17184 cm
The distance covered by the tire is equal to the circumference of the tire, which is equal to 2πd (d is the diameter of the tire). So we can calculate the number of revolutions by dividing the distance covered by the tire by the circumference of the tire.
Number of revolutions = distance covered / Circumference of the tire = 17184/ (2 x π x (38/100)) = 64.5 ✅