Answer:
the total resistance: 20 ohms
the resistance of the speaker: 16 ohms
the voltage across the speaker: 9.6V
Why are theories that are wrong as important as theories that are correct? science
Dont put whatever OR else ill report
Answer:
A theory is an opinion but in fancy format.
Explanation:
it is an explanation of observed regularities. The terms "established" and "observed regularities" are important here.
A theory is a way to explain a opinion on a certain topic.
A loudspeaker diaphragm is oscillating in simple harmonic motion with a frequency of 379 Hz and a maximum displacement of 0.562 mm. What are the (a) angular frequency, (b) maximum speed, and (c) magnitude of the maximum acceleration
Answer:
f = 379 / s given
A) ω = 2 pi f = 2380 / sec
B) Vmax = ω A = 2380 / sec * .000562 m = 1.34 m.s
C) amax = -ω^2 A = -(2380)^2 * .000562 = -3180 m/s^2
If 2 waves collide with each other, would they cancel out, or merge?
Answer:
It depends on the velocity, if 1 wave is going faster than the other, it could eat the other wave and thus: Merge.
If they are the same speed they would cancel out, it would be like 2 trucks hitting each other.
Explanation:
If 2 waves crash at 15mph they would splash back and fall into the water. Think about boxers.
Answer: Destructive interference occurs when waves come together in such a way that they completely cancel each other out. When two waves interfere destructively, they must have the same amplitude in opposite directions.
Hope this helps :)
What are the advantages and disadvantages to whole-tire recycling?
Given what we know, we can confirm that whole-tire recycling has advantages for the environment, as well as economic disadvantages.
What are the Pros and Cons of recycling tires?Tires are made from rubber mixed with other substances such as steel and certain polyester fibers. This makes the tires a poor source of rubber and said rubber would not be of great quality when recycling, this along with the high cost of the process entails the disadvantages of recycling tires. The advantage, however, is environmental, as tires take up a great portion of the space in landfills and greatly pollute the air when burning.
Therefore, we can confirm that whole-tire recycling has advantages for the environment, as well as economic disadvantages due to its poor quality material and high cost of recycling.
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What would likely happen if the fed changed reserve requirements?
Answer:
When the Fed adjusts the reserve requirement, it allows banks to charge lower interest rates.
Explanation:
Hope this helps.
What do you mean by electromagnetic induction?
What do you mean by electromagnetic induction ?
Well Explained Answer : -Discovery : -
A British scientist Michael Faraday and an American scientist Joseph Henry discovered the phenomenon of electromagnetic induction in 1831 independently.
Definition / Meaning : -
The production of electricity from magnetism is called electromagnetic induction.
Or ,
Electromagnetic induction is the phenomenon of the production of an induced current in a coil placed in a region where the magnet field changes with time
For Example : -
(i) If a bar magnet is moved in and out of coil of wire , even then an electric current is produced. This is an example of electromagnetic induction.
(ii) Another example , when a straight wire is moved up and down rapidly between the two poles of a horseshoe magnet , then an electric current is produced in the wire. This is also an example of electromagnetic induction .
#[tex] \rm{ \bold{Keep \: Learning}}[/tex]Electromagnetic induction denotes to producing electricity using magnetic field or magnetism.
This is the process or phenomenon of production of induced induced current in a region where magnetism changes with respect to the time.
It was discovered by great scientist Michael Faraday.
Define 1 joule work done.
Answer:
1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.
Explanation:
If a bullet of mass 50 gm is moving with the velocity of 720 km/hr. Calculate its kinetic energy. Ans: here, mass (m)= 50 gm = 50/1000 kg = 0.05 kg velocity (v) = 720 km/hr= 720×1000/60×60=200m/s kinetic energy = ? We know, K.E.= 1/2 mv^2 = 1/2 × 0.05×(200)^2 = 0.05×40000/2 = 1000j ans. Is it correct???????
Answer:
yes 1000 j as I posted on the same Q elsewhere
Explanation:
One end of a copper rod is placed in a flame of a Bunsen burner. Small pieces of wax placed along the rod melt at progressively larger distance from the flame. Heat is transferred through the rod by ________.
1) Convection
2)Radiation
3)Conduction
Answer:
3) Conduction
Explanation:
When heat is transferred through a material, it can be referred to as conductionThe wax on the rod can only melt by the rod only if it is in contact with it] After treatment, hospital equipment may become contaminated.
Describe the level of the hazard associated with contamination with technetium-99.
You should include in your answer a description of how the level of hazard changes
over time.
Answer:
below
Explanation:
The primary hazard when working with technetium is inhalation of dust; such radioactive contamination in the lungs can pose a significant cancer risk. All technetium compounds should be regarded as highly toxic, largely because of its radiological toxicity. Once in the human body, Tc-99 concentrates in the thyroid gland and the gastrointestinal tract. The body, however, constantly excretes Tc-99 once it is ingested.
A brick is sitting motionless on top of a wall. What type of energy does it have? (1 point)
A) geothermal energy
B) electromagnetic energy
C) potential energy
D) kinetic energy
The block that is sitting motionless on top of a wall contains potential energy.
What is energy?Energy is the ability to do work. There are several forms of energy. For the block that is sitting motionless on top of a wall, the block contains potential energy.
The potential energy is the block is used to do work when the block falls. The block can break a piece of glass on the floor due to the energy that it contains.
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hello people ~
Both chasmogamous and cleistogamous flowers are present in
(a) Helianthus
(b) Commelina
(c) Rosa
(d) Gossypium
(b) Commelina
Explanation:
Both chasmogamous and cleistogamous are present in Commelina.
In commelina, the flowers have anthers and stigma hanging outside of the flower. Petals are colourful and contains scent and nectars to attract birds and insects. Both of these are present in commelina flowers.
Answer:
Commelina
Explanation:
Commelina is type of flower at where the stings and anthers remains hanging outside of the flower.To get help in pollination they used to attract insects by their scentsI need help ASAP! All help is appreciated:)
Waldo gets stopped by the police, and the police officer tells Waldo that she caught him on radar doing 50 miles per hour in a 40 miles per hour zone. Waldo responds, "No way! I was traveling 50 miles per hour. I sat at home for 1 hour and then drove for 1 hour before you stopped me. I traveled 50 miles total in that second hour. So, my speed was 25 miles per hour. That's well under the speed limit." Waldo is wrong, per speeding laws, and does receive a speeding ticket. Explain how Waldo came up with a speed of 25 miles per hour.
A perfectly spherical orange is split into four equal sections. if the radius of the orange is 4 centimeters, what is the total surface area of one slice? 16π cm2 32π cm2 24π cm2 64π cm2
The total surface area of one slice will be 64 π cm².
What is the total surface area?The total surface area includes the base as well as the curving component. It is the whole area covered by the object's surface.
The total area of a form with a curved surface and base is equal to the sum of the two areas.
The total surface area of the sphere will be;
[tex]\rm A=4 \pi r^2 \\\\ \rm A=4 \times \pi (4)^2 \\\\ \rm A=64 \pi \ cm^2[/tex]
Hence the total surface area of one slice will be 64 π cm².
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Answer:
32
Explanation:
explain the concept of force by practical examples of daily life
Answer:
a bicycle moving
Explanation:
due to the force that is applied towards the wheels of a bicycle and also gravitation the wheels. of a bicycle are therefore able to move
1. 50 W and 100 W lamps are designed for the same voltage. Which lamp has the higher filament resistance and why?
2. At a voltage of 4 V, 300 mA flows through the bulb. What is the work done by the electric current in 5 min?
3. The label on the lamp says 100 W, 220 V. Calculate the resistance of the lamp?
4. What is the work done by the motor of a floor polisher in 25 min with a voltage of 220 V, a current rating of 1,25 A and a motor efficiency of 80%?
help
Answer:
Look below.
Explanation:
1.) The resistance of a light bulb filament is effected by both length and cross-sectional area. Thicker wires have less resistance. A 120-Watt bulb has a greater current and a smaller resistance. Thus, a 120-Watt bulb must have a thicker filament than a 60-Watt bulb (assuming the lengths of the filaments are identical). We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?
2.) Energy transferred = 120 × 2 = 240 J. This equation can be rearranged to V = E ÷ Q. So voltage is energy transferred divided by charge.
3.) Power= Voltage × Current
4.) W=Pt
Matter can undergo chemical reactions and nuclear reactions. Which
property is conserved in chemical reactions but NOT in nuclear reactions?
O A. Type of energy
O B. Kinds of compounds
O c. Number of atoms
O D. State of matter
State of matter is conserved in chemical reactions but not in nuclear reactions.
What is not conserved in a nuclear reaction?
In a nuclear reaction, mass is not conserved because of the release of radiation. The difference in masses of reactants and product nuclei, occurs due to release of energy.
So we can conclude that State of matter is conserved in chemical reactions but not in nuclear reactions.
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Nuclear and chemical processes are both possible in the matter. In chemical processes, the property of no atoms is conserved, but not in nuclear reactions. Option C is correct.
What is nuclear fusion?The process by which two or more tiny nuclei unite to generate a bigger nucleus is known as a nuclear fusion reaction.
The more energy it takes to liberate an electron from a smaller atom. This is referred to as binding energy.
In the nuclear reaction, one atom gets disassociated with the other atom. The process is known as nuclear fission.
Nuclear and chemical processes are both possible in the matter. In chemical processes, the property of no atoms is conserved, but not in nuclear reactions.
Hence, option C is correct.
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Ydu have 50g of water in a beaker, and the water is 24 degrees Celsius. If
you divide the water into two beakers, with 25g in each beaker, what is
the temperature of each one?
If 50g of water in a beaker is split into two beakers i.e. 25g in each beaker, the temperature of each of one will still be 24°C.
What is temperature?Temperature is the degree of hotness or coldness of a body. Temperature is measured in °C.
According to this question, there is 50g of water in a beaker, and the water is 24 degrees Celsius.
If I divide the water into two beakers, with 25g in each beaker, the temperature of the water in each beaker will be 24°C.
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What do ethical guidelines for research with human subjects mean?
By minimizing harms and risks and maximize benefits , respect human dignity, privacy and autonomy, take special precautions with vulnerable population and strive to distribute the benefits and burdens of research fairly
What are the three main guidelines in psychological research?
Answer:
Ethical Guidelines for Research With Human Subjects
Participation Must Be Voluntary.
Researchers Must Obtain Informed Consent.
Researchers Must Maintain Participant Confidentiality
Explanation:
Basta Yun na yan correct me if I'm wrong hehehhe
An object is thrown straight upward from the edge of a building with a velocity of 20m/s. Where will the object be 5s after it was thrown
Explanation:
V = S/t
s =vt
d = 20 x 5
d = 100m
The position of the ball 5 seconds after it was thrown will be 25 m below the edge of building.
What are the three equations of motion?
The three equations of motion are -
v = u + at
S = ut + 1/2at²
v² - u² = 2aS
Given is an object which is thrown straight upward from the edge of a building with a velocity of 20m/s.
Initial velocity [u] = 20 m/s
Acceleration due to gravity [g] = - 10 m/s² (Rounded off 9.8)
At maximum height, the velocity will be 0.
Assume that the time at which the ball reaches max height be T.
Using first law of motion -
v = u + aT
0 = 20 - gT
gT = 20
T = 20/g
T = 20/10
T = 2 sec
Then -
S[max] = 20 x 2 - 0.5 x 10 x 4
S[max] = 40 - 20 = 20 m
At t = 2 sec the ball will be at maximum height. Now at maximum height, the initial velocity of the ball will be 0.
We have to find the position of ball after 3 seconds as after 2 seconds it was at maximum height.
In this case initial velocity will be [u] = 0
Acceleration [a] = 10 m/s²
Time [t] = 3 sec
Using second equation of motion -
S = ut + 1/2at²
S = 0.5 x 10 x 9
S = 45 m
Position of object = [x] = 20 - 45 = - 25 m
The negative sign indicates that the object is now 25 cm below from the edge of building.
Therefore, the position of the ball 5 seconds after it was thrown will be 25 m below the edge of building.
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From a penalty kick, the ball rebounds off the goalkeeper back to the player who took the kick. That player then kicks the ball into the goal. What is the correct restart
The correct restart is for there to be another kick off taken in this type of scenario.
What is Kick-off in Soccer?This is a method of restarting play in which the ball is put on the center circle and passed by a player.
Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
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Answer:Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
Explanation:
Calculate the direction cosines of a→+b→, given that a→=4i^+7j^-5k^ and b→=3i^+4j^+k^
The direction cosines of a→+b→, are
cos ∝ = 0.5232 cos β = 0.8065 cos γ = 0.2933Given data:
a = 4i^ + 7j^ - 5k^
b= 3i^ + 4j^ + k^
Calculate the direction cosines of a→+b→a→+b→ = 7i + 11j - 4k
( a→+b→ ) / | a→+b→ | = ( 7i + 11j - 4k ) / [tex]\sqrt{7^2 + 11^2 + 4^2 }[/tex]
= ( 7i + 11j - 4k ) / 13.64
= 0.5232 i + 0.8065 j + 0.2933 k
Therefore the direction cosines are
cos ∝ = 0.5232
cos β = 0.8065
cos γ = 0.2933
Hence we can conclude that the direction cosines of a→+b→ are as listed above.
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3. What is mechanical advantages and velocity ratio of a machine?
Answer:
Mechanical advantage:
i. The ratio of load to effort on a balanced lever is called mechanical advantage.(Definition)
ii. Mechanical advatage (MA) = Load (L)/Effort (E) (Formula)
Velocity ratio:
i. The ratio of effort distance to load distance is called velocity ratio.(Definition)
ii. Velocity ratio (VR) = effort distance(Ed)/ load distance(Ld). (Formula)
Two forces, F1 = -3000 N and F2 = +1500 N acts on a plane horizontally. The craft is moving with a constant velocity of -850 m/s. A third force F3 is also present in the scenario but is not indicated in the image below. Find the magnitude and direction of F3
Because the net force must be zero, we conclude that the magnitude of the force is 1500 newtons, and the direction is in the positive axis.
What is the magnitude and direction of the third force?
By Newton's laws, we know that if the net force applied to an object is different than zero, then the object is accelerated.
In this case, we know that the object moves with constant velocity, so there is no acceleration, meaning that the net force is equal to zero.
Then we must have:
F1 + F2 + F3 = 0N
Replacing F1 and F2 we get:
-3000 N + 1500N + F3 = 0
F3 = 3000N - 1500 N = 1500N
Then the magnitude of the force is 1500 newtons, and the direction is in the positive axis.
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1. When a net force F acts on an object of mass M, the object accelerates at 16 m/s². An equal net force F acts on a second object of mass 2M. What is the acceleration of this second object?
Francis is standing at a railway crossing. A train sounds its horn as it moves toward him at a speed of 45 km/hr. If the train conductor hears the horn at 287 Hz, what frequency (in Hz) does Francis hear?
The frequency observed by Francis when the train approaches is 297.4 Hz.
Doppler effect
The frequency observed by Francis is determined by applying the principle of Doppler effect.
The frequency observed by Francis is calculated as follows;
[tex]f = f_o(\frac{V}{V \pm V_s} )[/tex]
where;
f is the source frequencyf₀ is the observed frequencyVs velocity of the source when it is moving towards the observerV is velocity of sound45 km/h = 12.5 m/s
Speed of sound in air = 343 m/s
Since the train is moving towards the observer, the frequency heard by the observer will be greater than the source frequency, thus we will choose positive sign for the source velocity.
[tex]f = f_o(\frac{V}{V + V_s} )\\\\287 = f_0 (\frac{343}{343+ 12.5)} )\\\\287 = 0.965f_0\\\\f_0 = \frac{287}{0.965} \\\\f_0 = 297.4 \ Hz[/tex]
Thus, the frequency observed by Francis when the train approaches is 297.4 Hz.
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What type of particle carries an electric current through a wire? Voltage is another name for the __________ difference. What word completes the sentence?
Answer:
electric potentialbrainless plsss
Fluorescence occurs when an object absorbs ____________________ and immediately releases the energy as visible light.
Answer:
The answer should be light or other electromagnetic radiation
Explanation:
Such as x-rays or other things like that.
-Hope This Helps!
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In terms of the wavelength of the sound wave, how far apart are the first two resonant positions in the resonance tube?.
Answer:
The lunar highlands were formed about 4.5 billion years ago, they are the oldest features (or regions) on the moon. The maria were formed some 3.5 billion years ago, erasing and covering the 'highlands' in the regions they formed.
Explanation:
In case of the resonance tube, the first two resonant positions of sound wave are separated by one-quarter of its wavelength.
What is acoustic resonance?
An acoustic system would amplify sound waves whose frequency matches one of its own natural vibrational frequencies as a result of a process known as acoustic resonance.
Since most acoustic instruments use resonators, such as the length of a flute's tube, the strings and body of a violin, and the form of a drum membrane, acoustic resonance is a crucial factor for instrument builders. For hearing, acoustic resonance is also crucial.
The separation between two consecutive nodes or antibodies is equivalent to half the wavelength. A node's distance from its next antinode is equal to one-quarter of its wavelength.
In case of the resonance tube, the first two resonant positions of sound wave are separated by one-quarter of its wavelength.
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