Answer:
The Big Dipper
Explanation:
Bootes is near the "Big Dipper" which is itself part of Ursa Major.
A stereo speaker is placed between two observers who are 40 m apart, along the line connecting them. if one observer records an intensity level of 59 db, and the other records an intensity level of 83 db, how far is the speaker from each observer?
The distance from observer A of intensity of sound 59 db is 28.64 m and the distance from observer B of intensity of sound 83 db is 11.36m
Explanation:
Let's solve this problem in parts
let's start by finding the intensity of the sound in each observer
observer A β = 59 db
β = [tex]10 log\frac{I_a}{I_o}[/tex]
where I₀ = [tex]1 \times 10^{-12}[/tex] W / m²
[tex]I_a = I_b \times 10 ^{ \frac{\beta}{10} }[/tex]
[tex]I_a = 1\times 10 ^{-12} \times 10 ^{ \frac{59}{10} }[/tex]
[tex]I_a[/tex] = [tex]2.51 \times 10 ^{-6}[/tex] W / m²
Similarly for Observer b [tex]I_b = 3.16 \times 10 ^ {-4}[/tex]
now we use that the emitted power that is constant is the intensity over the area of the sphere where the sound is distributed
P = I A
therefore for the two observers
the area of a sphere is
[tex]A= 4\pi \times r^2[/tex]
we substitute the above formula, we get
Let us call the distance from the observer A be to stereo speaker = x, so the distance from the observer B to the stereo speaker = 40- x; we substitute
[tex]I_a (35 -x) ^2 = I_b x^2[/tex]
after solving the above equation we get x = 28.64 m
This is the distance of observer A
similarly The distance from observer B is 35 - x
= 40 - 28.64
= 11.36m
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Which description best matches the image below of a hand that is using the right hand palm rule?
The right hand palm rule is that a proton moving down in the magnetic field points away from you and will experience a towards the left . Option A
What is the Flemings right hand rule?The Flemings left and right hand rule from the foundation of electromagnetism. Recall that electromagnetism has to do with the production of current by the relative motion between a charge and a magnetic field.
According to the Flemings right hand rule, when the thumb, the fore finger and the middle finger are mutually perpendicular to each other, then the then the thumb points towards the direction of the magnetic force, the forefinger points towards the magnetic field and the middle finger points in the direction of the current.
As such, the description that matches the image below of a hand that is using the right hand palm rule is that a proton moving down in the magnetic field points away from you and will experience a towards the left . Option A
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What is an advantage of transmitting information using digital signals?
OA. Digital signals send information very quickly with excellent quality.
B. Signals sent digitally increase in strength as distance increases.
C. Digital signals do not use servers, a network, or the cloud.
D. Digital signals are more exact copies of information than analog
signals.
An advantage of transmitting information using digital signals is A. Digital signals send information very quickly with excellent quality.
A digital signal is a signal that means data as a sequence of discrete values. A digital signal can only carry on one value from a finite set of possible values at a given time. With digital signals, the physical quantity expressing the information can be many things: Variable electric current or voltage line.
What is an benefit of transmitting information using digital signals?Digital signals can transmit information with less noise, distortion, and interference. Digital circuits can be reproduced easily in mass amounts at comparatively low costs. Digital signal processing is more flexible because DSP operations can be changed using digitally programmable systems.
How are digital signals transmitted?Digital signals can be transmitted over transmission lines using either serial or parallel transmission. With serial communication, the sequence of bits used to represent a value is sent in sequence along a single transmission line.
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Suppose a comet orbits the sun on a highly eccentric orbit with an average (semimajor axis) distance of 1 au. how long does it take to complete each orbit, and how do we know?
If a comet were to orbit the sun with a highly eccentric orbit and an average (semimajor axis) distance of 1 au, we might use Kepler's third law of planetary motion to determine that each orbit would take one year to complete.
To find the answer, we need to know about the Kepler's third law of planetary motion.
What is Kepler's third law of planetary motion?The period of a planet's orbit (T) squared is equal to the size of the semi-major axis of the orbit (a) cubed when it is stated in astronomical units because T² ∝ a³ according to Kepler's Third Law. In reality, Kepler's Third Law compares a planet's orbital period and radius to those of other planets.Thus,[tex]a=1AU\\T=(1)^{3/2}=1 year[/tex]
Thus, we can conclude that, If a comet were to orbit the sun with a highly eccentric orbit and an average (semimajor axis) distance of 1 au, we might use Kepler's third law of planetary motion to determine that each orbit would take one year to complete.
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What feature of the solar system separates the terrestrial planets from the jovian planets?
Jovian Planets have low density and no Earth like things, like the terrestrial planets.
All of the planets in our solar system,except Pluto—are categorized as either terrestrial (like Earth) or jovian (like Jupiter) planets
Terrestrial planets:
The planets Mercury, Venus, Earth, and Mars are all terrestrial. These planets are both physically and mass-wise quite small. A terrestrial planet has a dense interior of metals and a stable rocky surface. These planets are warmer than planets farther from the sun because they are closer to the sun in the solar system.Jovian planets:
Saturn, Uranus, Neptune, and Jupiter are examples of jovian planets. These planets are bigger and heavier. The surfaces of Jovian planets are not solid. Due to their size and composition, which is primarily gases, they are sometimes referred to as gas giants. Only in the deepest regions of the Jovian planets' cores can one find trace amounts of rocky elements. Jovian planets are cooler because they are farther from the sun than terrestrial planets in the solar system.Learn more about the Solar system with the help of the given link:
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By what age do babies generally develop full sensitivity for taste?
By the age of
babies generally develop full sensitivity for taste.
Answer: 12 to 19 months
Explanation:
An electron is ejected from the cathode by a photon with an energy slightly greater than the work function of the cathode. How will the final kinetic energy of the electron upon reaching the anode compare to its initial potential energy immediately after it has been ejected?.
The kinetic energy of the ejected electron (photoelectron) is equal to the energy of the photon minus the work function (E required to eject the photoelectron).
The process of final kinetic energy of the electron upon reaching the anode compare to its initial potential energy immediately after it has been ejected -
The electron has a lot of potential energy and very little kinetic energy when it is liberated from the cathode (as it is not moving yet or moving very slowly). We are currently on the left side of the picture above. The electron accelerates and speeds up as it goes away from the cathode and toward the anode. As a result, the kinetic energy rises.The electron is likely to have the highest kinetic energy and the lowest potential energy when it reaches the anode.Therefore, the kinetic energy at the end of the electron's journey is approximately equal as the potential energy at the beginning (when the electron was released).Learn more about kinetic energy
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The school is 1 km away from a teacher’s house. A teacher driving to the school has an acceleration of 20 m/s2 . When starting from rest, what would be the distance travelled in 10 seconds? How much more distance does the teacher have to travel to reach the school?
[tex]x = \frac{at {}^{2} }{2} + vt + x(0)[/tex]
[tex]x = \frac{20 \times (10) {}^{2} }{2} + 0 + 0 = \frac{2000}{2} = 1000 \: meters[/tex]
2)0 meters since she has already reached school. Note: 1000 meters = 1 kilometer21. A person standing 49.5m from the foot of a cliff claps his hands and hears an echo 0.3
seconds later. Calculate the velocity of the sound in air
Answer:
330 m/s
Explanation:
The sound wave has to travel TO the cliff AND back = 2 * 49.5 = 99 m
magnitude of velocity = distance / time = 99m / .3 s = 330 m/s
What have we learned from the work of harlow shapley and others about the location of the sun in the milky way galaxy?.
We learned that We are in the disk of the Galaxy, about 5/8 of the way from the center.
What is the work of Harlow Shapley?Shapley, who was based in Boulder, Colorado, utilised Cepheid variable stars to determine the Milky Way Galaxy's size and the Sun's location within it through the use of parallax. He put out his "liquid water belt" theory, now referred to as the idea of a livable zone, in 1953.
Milky way Galaxy-
There are many stars, grains of dust, and gas in the Milky Way. It is known as a spiral galaxy because, from the top or bottom, it would appear to be whirling like a pinwheel. About 25,000 light-years from the galaxy's nucleus, the Sun is situated on one of the spiral arms.
Approximately 5/8 of the way from the galaxy's nucleus, we are in the disc. William Herschel believed that the Sun and Earth were about in the middle of the vast cluster of stars known as the Milky Way.
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The electron in a ground-state h atom absorbs a photon of wavelength 97. 25 nm. to what energy level does the electron move?
The electron in a ground-state H atom absorbs a photon of wavelength 97. 25 nm. Energy level till where the electron move is 4
Rydberg's equation is formula which signifies relation of wavelength of incident photon and the energy level.
Rydberg's equation is used to find out the relation between the wavelength and the Energy Levels:
1/λ = RZ² (1/n₁² - 1/n₂²)
where, λ is wavelength = 97.25 nm
R is the Rydberg constant = 1.0967 × 10⁷ m
n₁ is the initial energy level i.e. the Ground state, n₁ = 1
n₂ is the higher energy level
On substitution of the above value:
1/97.25 × 10⁻⁹ = 1.0967 × 10⁷ ( 1 - 1/n₂²)
On solving,
⇒ n₂ = 4
Hence, the higher energy level is 4
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What is the change in temperature for the aluminum wire? c what is the change in temperature for the steel wire? c what is the change in temperature for the lead pellets? c
Answer:
-79.6
-80
-81.2
Explanation:
Fart
What is the change in temperature for the aluminum wire?
-79.6
What is the change in temperature for the steel wire?
-80
What is the change in temperature for the lead pellets?
-81.2
What 4 pieces of information do you need to gather while you’re stopped and waiting to turn at a traffic light?
The four pieces of information that you need to gather while you’re stopped and waiting to turn at a traffic light include the following Check rear, Check for a gap, Check path and Check signal.
What is traffic light?Traffic light are those set of light signals found on the highway road side that helps in controlling and monitoring the moving vehicles.
The traffic light is made up of three lights which include the following:
Red light: This tells the driver to stop or wait.Amber light: This signals the driver to stop where is safe because the light is about turning red.Green lights: This shows that the driver can move.When stopped by the traffic light you need to gather the following information to avoid tragic situations;
Check rear, Check for a gap,Check path and Check signal.Learn more about traffic light here:
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What is the length of the color attribute?
What is the longest material key can we have in our data warehouse?
The length of the colour attribute is 6 characters.
What is a colour attribute?Each colour has a distinct look based on three essential characteristics: hue, chroma (saturation), and value (lightness). It's critical to use all three of these properties when describing colour to appropriately identify it and distinguish it from others.
What is the use of colour attributes?The HTML <font> color Attribute specifies the text color within the font element. Values of Attributes: colour name: It uses the colour name to set the text colour.
It should be noticed that colours are represented by the hex triplet.
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As a gaseous element condenses, the atoms become ________ and they have ________ attraction for one another.
Answer:
blank 1: close together
blank 2: more
An organ pipe with a fundamental frequency f is open at both ends. if one end is closed off, the fundamental frequency will:______
The fundamental frequency will drop by half.
The lowest frequency of a periodic waveform is known as the fundamental frequency. In other words, it is the lowest frequency that can be produced by a certain instrument. The first harmonic of the instrument is another name for the fundamental frequency.
An open-ended organ pipe's basic wavelength is twice as long as the pipe itself. The fundamental wavelength is four times the pipe's length if one end is closed. The fundamental frequency decreases by half because the wavelength doubles when one end of the pipe is sealed off but the speed of sound remains unchanged.
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The reason the position of a particle cannot be specified with infinite precision is the?
The reason the position of a particle cannot be specified with infinite precision is the uncertainty principle .
The position of a particle moving in a straight line is a vector which represents a point P on the line in relation to the origin O. The position of a particle is often thought of as a function of time, and we write x(t) for the position of the particle at time t.
The Heisenberg uncertainty principle is a law in quantum mechanics that limits how accurately you can measure two related variables. Specifically, it says that the more accurately you measure the momentum (or velocity) of a particle, the less accurately you can know its position, and vice versa.
The uncertainty principle (for position and momentum) states that one cannot assign exact simultaneous values to the position and momentum of a physical system. Rather, these quantities can only be determined with some characteristic “uncertainties” that cannot become arbitrarily small simultaneously
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What is the distance traveled by an object that moves with an average velocity of 8.0 m/s for a total of 4.0 seconds? please show your work in order to earn credit for this question.
The distance traveled by the object is 32 m.
What is Kinematic equation?The motion of an object with constant acceleration is described by a set of equations known as the kinematic equations. Integrals, derivatives, and rates of change must all be understood in order to solve kinematics problems.Calculation for determining distance traveledIf an object is traveling with a consistent velocity, this is referred to as uniform motion.
The equation below gives the average speed of an item moving uniformly:
v = d/t
where
v= average speed
d = traveled distance
t= The amount of time used
The object in this problem is as follows:
v = 8.0 m/s is the average speed
The time was t = 4.0 s.
We determine the distance traveled by solving for d:
d = vt = (8.0)(4.0) = 32 m
Hence, the distance traveled by the object is 32 m.
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Alaskan natives often eat whale blubber while other groups of people typically do not. this is an example of __________. a. food variety b. stress c. palpability d. learned preferences please select the best answer from the choices provided a b c d
Alaskan Natives often eat whale blubber while other groups of people typically do not. (d)This is an example of learned preferences.
What are Learning Preferences?
Learning styles can be defined as the way in which an individual generally responds to specific learning situations and prefers to process different forms of information. Often, learning styles are regarded as the preferred methods for undertaking learning, for example, reader/writer, audio/visual etc., but this is a narrow definition. Learning preferences as a term is generally considered to take in a broader set of factors than just methods as they also take into account aspects that might impact on learning, such as: the environment and where and when students prefer to do their learning. For example, a student may prefer to work alone at home, and do her assignments late in the evening when the family has gone to bed. Another student may thrive in group situations and only wish to study during the day on-campus. In a nutshell, learning styles and preferences help to describe how people learn best in their context, and are useful in raising awareness about this.To learn more about Learning Preferences: https://brainly.com/question/2289046
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A heater marked 2000W/3000W is switched on for 4 hours. For the first hour it is on the highest setting and for the last 3 hours it is on the lowest setting
1.1 How much energy does it transfer to the room in kWh (9kWh)
Answer:
9 kW-hr
Explanation:
3000 W = 3 kW for 1 hr = 3 kW - hr
2000 W = 2 kW for 3 hr = 6 kW -hr
total power = 3 + 6 = 9 kW-hr
What is the specific heat of a substance that requires 99,100 J of thermal energy to heat 3.47 kg of this substance from 11°C to 45°C?
Answer: [tex]\Large\boxed{0.84~J/g^\circ C}[/tex]
Explanation:
Given information
[tex]Q~(Energy)=99,100~J[/tex]
[tex]m=3.47~kg[/tex]
[tex]\Delta T=(T_{Final}-T_{Initial})=(45-11)=34^\circ C[/tex]
Given formula
[tex]Q=m\times c\times\Delta T[/tex]
[tex]Q=Energy\\m=mass\\c=specific~heat\\\Delta T=Change~in~temperature[/tex]
Convert the unit of mass into Grams
[tex]1~kg=1000~g\\[/tex]
[tex]3.47~kg=3.47\times 1000=3470~g[/tex]
Substitute values into the given formula
[tex](99100)=(3470)\times c \times(34)[/tex]
Simplify by multiplication
[tex]99100=117980~c[/tex]
Divide 117980 on both sides
[tex]99100\div117980=117980~c\div117980[/tex]
[tex]\Large\boxed{c=0.84~J/g^\circ C}[/tex]
Hope this helps!! :)
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When a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 n·m2/c. when the paper is turned 25° with respect to the field the flux through it is:_____.
The flux through the paper when the paper is turned 25° with respect to field will be 22.67 [tex]Nm^{2} /C[/tex].
We have a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 [tex]Nm^{2} /C[/tex].
Now we have to calculate the flux through the paper if it is turned 25° with respect to the field.
What do you mean by Electric flux? What is the formula to calculate it?Electric flux (E) through a surface is defined as the dot product of Electric field vector and Normal vector to the surface. The formula to calculate the electric flux is -
Φ = [tex]\vec{E}.\vec{A}[/tex] = E x A x cosθ
In the question it is given that when one face perpendicular to a uniform electric field the flux through it is 25 [tex]Nm^{2} /C[/tex]. In this case θ = [tex]0^{o}[/tex].
Therefore -
E x A x cos [tex]0^{o}[/tex] = 25
EA = 25 [tex]Nm^{2} /C[/tex]
When the paper is turned [tex]25^{o}[/tex] with respect to field, then the flux through it can be calculated as follows -
Φ = 25 x cos ([tex]25^{o}[/tex]) = 22.67 [tex]Nm^{2} /C[/tex].
Hence, the flux through the paper will be 22.67 [tex]Nm^{2} /C[/tex].
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How would you position a flat loop of wire in a changing magnetic field so that there is no induced emf in the loop?
Position the loop so that the field lines run perpendicular to the area vector or parallel to the surface so that there is no induced EMF in the loop
Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts.
Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface. In electronics, the term applies to any electrostatic field and any magnetic field . Flux is depicted as "lines" in a plane that contains or intersects electric charge poles or magnetic poles.
As we all know that a moving charged particle will experience force by a magnetic field, the magnetic field produced by the field coil remains constant, that is, no force is experienced by electrons of the wire. So, we have to produce a relative motion between magnetic field and electrons.
Whenever the flux passing through the coil changes by any way (like either changing angle, magnetic field or area of coil), we are actually producing a relative motion between electrons and magnetic field. As a result, the electrons experience a magnetic force and shift to produce
flux = [tex]\int\limits {BAcos(theta)} \,[/tex]
theta = angle between magnetic field and area
Since we know , EMF get induced only when flux changes , if their is no flux change , no EMF can be induced
Hence , in order to not induce any kind of EMF ,we need to maintain a constant flux , but in question it is a changing magnetic field which means changing flux ,in this situation we need to align a flat loop parallel to magnetic field so , their is zero flux through the loop .
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What is the maximum weight of a luminaire (lighting fixture) permitted to be hung directly from an outlet box in a ceiling?
The maximum weight of a luminaire (lighting fixture) permitted to be hung directly from an outlet box in a ceiling 50 pound.
A luminaire that weighs more than 23 kg (50 lb) shall be supported independently of the outlet box, unless the outlet box is listed for not less than the weight to be supported.
Luminaire, or light fixture, complete lighting unit, consisting of one or more lamps (bulbs or tubes that emit light), along with the socket and other parts that hold the lamp in place and protect it, wiring that connects the lamp to a power source, and a reflector that helps direct and distribute the light.
Fluorescent fixtures usually have lenses or louvers to shield the lamp (thus reducing glare) and redirect the light emitted. Luminaires include both portable and ceiling- or wall-mounted fixtures.
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A scientist is studying the outer reef section of a coral reef. what features are they likely to see?
The features the scientist is likely to see are:
A jelly-like substance referred to as mesogleaCoral PolypsBased on the fact that a coral reef is an underwater ecosystem that contains different animals and species, they contain a colony of coral polyps.
What is a Coral Reef?This refers to the underwater ecosystem that contains different animals and species.
Hence, we can see that based on the fact that a scientist is studying the outer reef section of a coral reef, he would see the distinct characteristics of the coral and these are the:
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A loop of area 0.100 m² is oriented at a 15.5 degree angle to a 0.500 T magnetic field. It rotates until it is at a 45.0 degree angle with the field. What is the resulting CHANGE in the magnetic flux? [?]Wb
I NEED THIS FAST PLEASE!!!
The resulting change in the magnetic flux is =0.013Wb
what is magnetic flux?
Magnetic flux is defined as the total magnetic field which passes through a given area.It is the number of magnetic field lines that is flowing in a closed area.
Given:
At degree =15.5°,magnetic flux=magnetic field=0.500T
At degree=45.0°, magnetic field=0.500T
Magnetic flux=magnetic field ×Area×cos(angle)
magnetic flux (1) = 0.500×0.1×cos(15.5)
= 0.048
magnetic flux (2) = 0.500×0.1×cos(45)
=0.035
Resulting change in flux = 0.048-0.035
= 0.013Wb
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Help is needed with this physics question ASAP. Thanks!
We can see that the range from the calculation is 310 m.
What is the range of a projectile?When we throw something from a height and it lands at the same eight, we call it a projectile motion. A projectile must always be shot at an angle. The range of the projectile is obtained by the relation; R = u^2sin2θ/g
Thus;
g = acceleration due to gravity
θ = acute angle
u = velocity
R = (60)^2 sin2(30)/10
R = 310 m
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Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. Over the past 50 years, the amount of tropical rainforest acreage found throughout the world has decreased from 14.8 billion acres to 8.6 billion acres due to deforestation. What factor is likely most responsible for the changes observed in the world’s rainforests?
a.
volcanic activity
b.
human activity
c.
temperature changes
d.
solar eclipses
Please select the best answer from the choices provided
A
B
C
D
Who rediscovered aristarchus’s model of a heliocentric solar system? copernicus galileo kepler ptolemy
Copernicus rediscovered aristarchus’s model of a heliocentric solar system.
Aristarchus asserted that one may determine the distances between the Sun and Moon by measuring the angle between them when the Moon is half-illuminated (admittedly, the illumination itself suggested the angle). Aristarchus recognised that the Moon does not emit light of its own, but rather shines as a result of the Sun's light.
It's because Polish-born astronomer Copernicus was responsible. He initially introduced the heliocentric hypothesis in his book De revolutionibus orbium coelestium, "On the Revolutions of Celestial Bodies," which was released in.
Therefore, Copernicus rediscovered aristarchus’s model of a heliocentric solar system.
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Answer:
Copernicus
Explanation:
if a 2 liter bottle of coke cost $2.34 how much does 1mL of coke cost?
1mL of coke cost =$0.00117.
The cost of 2-liter bottle of coke is $2.34
The unit of 1 liter is 1000ml.
Then the 2 liter coke bottle volume is 2000ml
The formula is ( divide the total price by the quantity).
$2.34/2000=0.00117.
The capacity of a liquid is measured in metric units of volume called liters and milliliters. There are four units of measurement for liquid volume: milliliters, centiliters, liters, and kiloliters. The values of these units vary even though they all refer to the same quantity.
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