Materials in which electric charges move freely such as copper and aluminum are called
Answer:
Conductors allow electric charges to move freely
When astronomers observe the spectra of distant galaxies,they notice that the hydrogen emission lines are shifted noticeably toward the red end of the visual spectrum,a phenomenon called red shift. Red is lowest frequency of visible light. What does red shift indicate about the movement of the distant galaxies?
A redshift in the spectra of distant galaxies indicates that these galaxies are moving away from us due to the expansion of the universe. This discovery by Edwin Hubble has given astronomers a way to determine the distance of galaxies and observe the universe's evolution and age.
Explanation:The redshift observed in the spectra of distant galaxies indicates that these galaxies are moving away from us. This is a result of the Doppler Effect, a phenomenon that causes a wave's frequency to appear different than its original frequency due to the relative motion of the source and observer. The higher the redshift - the more the hydrogen emission lines are displaced to the red end of the spectra - the faster the galaxies are receding.
In 1929, astronomer Edwin Hubble observed this redshift and found it was proportional to the galaxies' distance from us, which led him to conclude that the universe is expanding. This means not only are galaxies moving away from us, but the space within the universe itself is increasingly getting larger.
This discovery has offered astronomers crucial insights into the age and evolution of the universe. The amount of redshift can be used to determine the distance to a galaxy, and consequently, looking at the redshifted light enables astronomers to 'look back' in time and see the state of the universe billions of years ago.
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Which substances resist pH changes?
Acids
Hydrogen ions
Buffers
Bases
The correct choice is Buffers.
Buffers contains both acids and bases in equilibrium.when base is added to buffers, they adjust the pH value by releasing hydrogen ions.when acid is added to buffers, they adjust the pH value by consuming hydrogen ions. hence these substances resist any change in their pH value by releasing or absorbing hydrogen ions.This process keeps the pH value constant.
According to charles' law, the volume of a fixed amount of gas is directly proportional to
According to Charles's law, the volume of a fixed amount of gas is directly proportional to its Kelvin temperature, assuming constant pressure. It means that volume of the gas increases with increase in temperature and decreases with decrease in temperature.
Explanation:According to Charles's law, the volume of a fixed amount of gas is directly proportional to its Kelvin temperature when the pressure is held constant. This law was named after the French scientist Jacques Alexandre César Charles, a pioneer in balloon flight. It essentially means that when the temperature of gas increases under constant pressure, the volume of the gas also increases and vice versa.
For instance, if you raise the gas temperature from 283 K to 303 K at a constant pressure, you will see an increase in its volume from 0.300 L to 0.321 L, corroborating Charles's law.
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A radioactive sample has a count rate of 800 counts per minute. One hour later, the count rate has fallen to 100 counts per minute. What is the half-life of the sample?
The First Telescopes created relied on the bending of the light to see objects in the night sky. This type of telescope is called ?
A. Reflecting Telescope
B. Radio Telescope
C. Refracting Telescope
D. Space Telescope
which describes the relationship between photon energy and frequency?
high energy photons have high frequencies hope this helps brother
What is the correct current value if the selector is in the 0.5 dcma position?
The correct current value is 1.35 A.
Explanation:The correct current value in the 0.5 dcma position can be determined using the given information. According to the information provided in the question, after 5.00 ms, the current declines to 0.368 of the initial value at t=0. Therefore, we can find the initial value of the current by dividing the value at t=5.00 ms by 0.368. Let's calculate:
Initial current = (0.368)(3.68 A) = 1.35 A
So, the correct current value if the selector is in the 0.5 dcma position is 1.35 A.
What type of collision is it if it bouunces of of each oyher?
What are the reactants and what is the product of Zn(s)+S(s)->ZnS(s)
In the reaction, Zn(s) + S(s) -> ZnS(s), Zinc (Zn) and Sulfur (S) are the reactants and Zinc Sulfide (ZnS) is the product. This type of reaction is known as a combination or synthesis reaction.
Explanation:In a chemical reaction, substances that interact are called reactants, and the newly formed substances are called products. In the reaction you have given, Zn(s) + S(s) -> ZnS(s), the reactants are zinc (Zn) and sulfur (S), and the product formed is zinc sulfide (ZnS). This type of reaction is a synthesis or combination reaction wherein two or more simple substances combine to form a more complex substance. It's important to note that in this reaction, Zn and S are in their elemental forms and the reaction represents the process of sulfide mineral formation.
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In the reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in solid form. The product is zinc sulfide (ZnS), also in solid form. This is a synthesis reaction where the elements combine to form a single compound.
Reactants and Product of Zn(s) + S(s) → ZnS(s)
In the chemical reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in their solid forms. The product of this reaction is zinc sulfide (ZnS), which is also in the solid state. Here is the step-by-step identification:
Reactants: Zinc (Zn) and Sulfur (S)
Product: Zinc Sulfide (ZnS)
This reaction is an example of a synthesis reaction, where two or more elements combine to form a single compound.
A car turns a corner that has a radius of 5 m and experiences a centripetal acceleration of 20 m/s². If the radius of turn were increased to 10 m, calculate the centripetal acceleration.
Answer:
10
Explanation:
How does the elbow medical and lateral epicondylitis?
How far does light travel in the time it takes sound to travel 1 cm in air at 20°c?
Final answer:
The distance light travels in the time it takes sound to travel 1 cm in air at 20°C is approximately 8.75 × 10^5 cm.
Explanation:
The speed of sound in air can be approximated using the formula v = 331.4 m/s + 0.6T, where T is the temperature of the air in Celsius. At 20°C, the speed of sound is approximately 343 m/s. To find the distance light travels in the time it takes sound to travel 1 cm in air at 20°C, we can set up a proportion.
If sound travels 1 cm in air at a speed of 343 m/s, we can set up the following proportion:
343 m/s / 1 cm = c / x
where c is the speed of light and x is the distance light travels in the same time. Solving for x, we find:
x = (1 cm) * (c / 343 m/s)
Substituting the speed of light c = 3.0 × 10^8 m/s, we can calculate the distance light travels:
x = (1 cm) * (3.0 × 10^8 m/s / 343 m/s)
x ≈ 8.75 × 10^5 cm
How does a gas do work?
A. By changing volume
B. By creating energy
C. By conserving energy
D. By flowing
A gas does work by changing its volume, adhering to the law of conservation of energy and resulting in increases in energy, pressure, and/or temperature.
A gas can do work by changing its volume. When a gas in a cylinder expands, it exerts a force on the piston and moves it, doing work. According to the Ideal Gas Law, work done by a gas results in an increase in its energy, which can manifest as an increased internal kinetic energy due to the motion of its atoms and molecules. This concept adheres to the law of conservation of energy, meaning that energy within a closed system is neither created nor destroyed, but can change forms. An example of work being done by a gas is when you inflate a bicycle tire; the air pressure and temperature increase inside the tire due to the work done by the pump.
Thus, the correct answer to how a gas does work is A. By changing volume.
A cran uses an average force of 5200N to lift a steel beam 25m. How much work does the crane do on the steal beam.
Please help or explain how to do this anyone. Please and thank youu
Which of the following would decrease the magnetic field around a wire?
A. decreasing the current
B. reversing the poles of the wire
C. looping a section of the wire into a solenoid
D. increasing the current
When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed.what will be the result?a larger current in the same directiona larger current in the opposite directiona smaller current in the same directiona smaller current in the opposite direction?
answer BBBBBBBBBBBB on EDGE
Answer:
a larger current in the opposite direction
Explanation:
As we know by Faraday's law of electromagnetic induction that rate of change in magnetic flux will induce electric current in a conducting coil linked with it
so it is given as
[tex]EMF = \frac{d\phi}{dt}[/tex]
now in this situation we know that first a magnet is entering into the coil so here the magnetic flux is increasing linked with the solenoid coil.
So it will induce some current in the coil which shows deflection in galvanometer coil.
Now when we pull the magnet out then it will decrease the flux linked with the coil so here the direction of induced current must have to decrease.
Also it is given that coil is removed at faster rate due to which the rate of change in flux will be more so here it will induce more current
so correct answer would be
a larger current in the opposite direction
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.20×106 N , one at an angle 12.0 ∘ west of north, and the other at an angle 12.0 ∘ east of north, as they pull the tanker a distance 0.700 km toward the north.
Find the wavelength of a wave traveling at 3.26 e6 m/s with a period of 0.0125 s.
Answer:
m=40.8km.
Explanation:
The frequency of a wave is the reciprocal of its period, so for the wave in this problem, its frequency isf= \frac{1}{T}= \frac{1}{0.0125 s} =80 Hzf=T
1
=
0.0125s1
=80Hz
The basic relationship bet
where
\lambdaλ is the wavelength of the wave
v is its speed
f is its frequency
If we plug the numbers given by the problem into this equation, we can find the wavelength of this wave:
\lambda= \frac{v}{f}= \frac{3.26 \cdot 10^6 m/s}{80 Hz}=4.08 \cdot 10^4 m=40.8 kmλ=
f v
=
80Hz
3.26⋅10
6
m/s
=4.08⋅10
4
m=40.8km
If you are looking straight ahead an object that is behind you is in your cone of vision.
a. True
b. False
Answer:
b. False
Explanation:
An object that is behind you, is not in your cone of vision, since your cone of vision, is an imaginary cone that projects from your eyes foward, approximate 60-degree angle straight foward. The cone of vision is the area of sight.
As you can not see behind you, an object behind you, is not in your cone of vision.
If element "X" is heavier than element "Y" then...
Question 4 options:
A.) Element "X" must be a metal.
B.) Then Element "X" must be on the right side of the periodic table.
C.) Element "X" must have more particles in the nucleus than Element "Y."
D.) Element "X" must have a higher melting point than Element "Y."
What is speed?
A. Distance (miles or meters)
B. Time (hours or seconds)
C. Time per distance (hours per mile or seconds per meter)
D. Distance per time (miles per hour or meters per second)
A ground-fault circuit interrupter is a (an) _____. A)wire that provides an easier path for a current to take if a short circuit develops B) electrical safety outlet that monitors current flowing to and from an appliance C) switch that opens when current in a circuit is too high
B) electrical safety outlet that monitors current flowing to and from an appliance.
What is Ground fault circuit interrupter?A GFCI should be used in any indoor or outdoor area where water may come into contact with electrical products.
The GFCIs be used in all kitchens, bathrooms, garages, and outdoors.
Here,
A ground-fault circuit interrupter is an electrical safety outlet that monitors current flowing to and from an appliance.
The ground-fault circuit interrupter, or GFCI,
It is a fast acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little as 1/40 of a second.
It works by comparing the amount of current going to and returning from equipment along the circuit conductors.
Therefore,
A ground-fault circuit interrupter is an electrical safety outlet that monitors current flowing to and from an appliance.
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A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy
Answer:
Gravity
Explanation:
The weight of a person is given by :
W = m g
Where
m is the mass of the person
g is acceleration due to gravity.
Weight of the person depend on the value of acceleration due to gravity. The mass of the person remains the same in every location. On the surface of earth it is equal to 9.8 m/s². While on surface of sun it is equal to 274 m/s².
Hence, a person on earth would weigh a lot more on the sun due to increased gravity.
For the electric field shown, which of the following statements describes an increase in voltage?
A) A negative charge crosses an equipotential line toward the source charge.
B) You cannot tell from the information given.
C) A positive charge crosses an equipotential line toward the source charge.
D) A positive charge moves along an equipotential line.
UPDATE: ANSWER IS C
Answer:
C
Explanation:
Just took test
A bus moves with 500000joules the driver applies brakes how much work is needed for the bus to stop
A ray of light passes from air into carbon disulfide (n = 1.63) at an angle of 28.0 degrees to the normal. what is the refracted angle?
A 72 kg sled Is pulled forward from rest by a snowmobile and accelerates at 2 m/s squared forward for five seconds. The force of friction acting on the sled is 120 N backwards. The total mass of the snowmobile and driver is 450 kg. The drag force acting on the snowmobile is 540 N backwards. What is the tension in the rope.
Final answer:
The tension in the rope is 516 N.
Explanation:
To find the tension in the rope, we need to calculate the net force acting on the sled. The net force is equal to the mass of the sled multiplied by its acceleration. Given that the sled has a mass of 72 kg and accelerates at 2 m/s² for 5 seconds, we can use the equation:
Net force = mass x acceleration
Net force = 72 kg x 2 m/s² = 144 N
However, there are two forces acting in the opposite direction - the force of friction (120 N backwards) and the drag force (540 N backwards). So, the net force is:
Net force = 144 N - 120 N - 540 N = -516 N
The negative sign indicates that the net force is acting in the opposite direction of motion. Therefore, the tension in the rope is equal in magnitude and opposite in direction to the net force, so the tension in the rope is 516 N.
what is the difference between series and parallel circuits and examples of when you would use them ?
A sound from a source has an intensity of 270 dB when it is 1 m from the source.
What is the intensity of the sound when it is 3 m from the source?
30 dB
90 dB
810 dB
2430 dB