The difference between a red shift and a blue shift has to do with wavelength frequency. T or F

Answer:

The correct answer is option D.

Explanation:

From the given options the reaction which is not a double replacement reaction is:

[tex]Zn (s) + 2HCl (aq)\rightarrow H_2 (g) + ZnCl_2 (s)[/tex]

This because the above reaction is an example of single replacement reaction.

[tex]AB+C\rightarrow AC+B[/tex]

Whereas;

Double replacement reaction is a type of chemical reaction in which exchange of ions among the reactants take place.

[tex]AB+CD\rightarrow AD+CB[/tex]

Answer:

A and B

Explanation:

" 1.8 Ampere " means "1.8 Coulomb/sec".

(2.5 C)/(1.8 C/sec) = (2.5/1.8) (s) = 1.39 sec

I honestly don't see where any of the choices comes from, but the closest one is (C) 1.45 sec.

Answer:

1.4 seconds, which is the third option

Explanation:

Current is defined as the flow of charge per time

Therefore, the equation that relates current, charge and time can be expressed as follows:

I = ΔQ / ΔT

where:

I is the current given = 1.8 ampere

ΔQ is the charge given = 2.5 coulomb

Δt is the time required for the flow of the given charges to give the 1.8 ampere.

Substitute with the givens in the above equation to get the time as follows:

1.8 = 2.5 / ΔT

ΔT = 2.5 / 1.8 = 1.38888 which is approximately 1.4 seconds

Answer:

A. The faster an object moves, the more stretched time becomes.    

Explanation:

According to special theory of relativity, when there is relative motion between two objects, an observer observes more stretched time with respect to another frame. This slowing down of time becomes apparent when the object moves very fast (close to the speed of light).

Thus, option A is correct.

The faster an object moves, the more stretched time becomes. The correct answer is A. Time dilation is a phenomenon predicted by the theory of relativity, both special and general relativity.

It states that time can appear to move at different rates for objects in different states of motion or in different gravitational fields.

According to special relativity, when an object moves at a high velocity relative to another object, time appears to slow down for the moving object from the perspective of the stationary observer. This effect is known as time dilation. As the velocity of the object increases, time dilation becomes more pronounced, and time appears to be "stretched" or slowed down for the moving object.

This phenomenon has been experimentally confirmed through various experiments, such as the measurement of the lifetimes of fast-moving particles in particle accelerators.

Therefore, option A is the correct description of time dilation: The faster an object moves, the more stretched time becomes.

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Answer:

Option C

Explanation:

We have to check range of all options first

For A:

Largest Value: 5

Smallest Value: 1

So range = Largest value - smallest value

5-1 = 4

For B:

Largest Value: 6

Smallest Value: 4

Range = 6-4 = 2

For C:

Largest Value: 9

Smallest Value: 1

Range = 9-1 = 8

For D:

Largest Value = 9

Smallest Value = 3

Range = 9-3=6

So, the data set in option C has the largest range

Nuclear energy is produced through controlled nuclear fission in reactors, where large uranium nuclei are split by neutrons, releasing energy to convert water to steam that turns turbines and generates electricity. Fission and fusion are two different processes that release energy from the nucleus of an atom. The entire process is meticulously controlled to provide a sustainable and powerful source of energy.

Nuclear energy is produced through the processes of nuclear fission or fusion. In a nuclear power plant, uranium is used in fuel rods, where its atoms are split apart by neutrons. When uranium nuclei split, they release energy, radiation, and more neutrons. This results in a controlled chain reaction. The energy released during this process is used to heat water, which then turns into steam. The steam drives a turbine connected to a generator, thus producing electricity.

There is a crucial difference in the types of nuclear reactions used for energy. In fission, large uranium nuclei absorb neutrons and break down into smaller nuclei, releasing a significant amount of energy. In fusion, which is not yet commercially viable, smaller nuclei are forced together to form larger nuclei, which also releases energy.

It's important to control the speed of the fission reaction to sustain the chain reaction for energy production and to prevent uncontrolled energy releases like those in atomic bombs. Natural uranium must first be enriched with uranium-235 to be effective in reactors. On the other hand, scientists continue to research how to achieve controlled fusion, which also has the potential to provide significant amounts of energy.

Answer:

Because they are moving to fast for Earth's gravity to pull it down.

Answer:

Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense.

Explanation: The more dense something is, the faster sound will travel through the matter. I hope this was the answer you was looking for.

Final answer:

Sound travels faster in mediums that are denser and more rigid, with solids being faster than liquids, which in turn are faster than gases. The closer particle arrangement in solids and liquids allows more efficient energy transfer. Temperature and air pressure also influence sound speed, with higher values generally leading to faster sound travel.

Explanation:

The speed of sound is influenced by the medium it travels through due to differences in density and rigidity. In solids, particles are packed together more closely compared to liquids, and in liquids, they are closer than in gases. This proximity allows for quicker transfer of sound energy from particle to particle. Sound waves travel faster in solids than in liquids because solids are more rigid and less compressible, and faster in liquids than in gases for similar reasons. In addition to rigidity and density, temperature also affects the speed of sound. Higher temperatures increase particle movement, thus enhancing sound transmission. The speed of sound is greater at sea level due to higher air pressure, which decreases the compressibility of air and allows sound to travel through it more quickly.

Answer:

f = 6.912 E14 Hz

Explanation:

The speed of the wave is defined as

speed = wavelength*frequency

the frequency of the photon  is defined as

f = speed / wavelength

f = 3 E8 m/s / 434 E-9 m

f = 6.912 E14 Hz

Buoyancy is a force that always acts in an upward direction exerted by a fluid on a body placed in the fluid

Hope this helps :)

Answer:

Explanation:

Buoyancy is a force that always acts in the upward direction against the weight of the immersed or semi-immersed object in the fluid. In any fluid( air or water) column pressure increases as we go deeper because of the overlying fluid. Here magnitude of the buoyancy force is proportional to the pressure difference.

Answer:

Newton gives us force

F=-G*M*m/R^2

Divide by the mass of the object to get acceleration

a=F/m = GM/R^2

You are solving the distance where the force from the moon equals the force from the Earth -

a= G*(mass of earth)/R^2 - G*(mass of moon)/(384400000-R)^2=0

Or in other words

G*(mass of earth)/R^2=G*(mass of moon)/(384400000-R)^2

Divide by G*(mass of the moon) and multiply by R^2 to get terms on both sides

G*(mass of earth)/(G*(mass of moon))=R^2/(384400000-R)^2

Since the mass of the moon and earth are fixed, the left side is a number

81.3 = R^2/(384400000-R)^2 → R^2/(384400000-R)^2–81.3 = 0

simplify

R/(384400000-R) = 9.01665

R=346024000 = 346,024 km.

Explanation:

Answer:

The answer would be C.

The correct answer is C. Allow water to flow away from the tire. Tread patterns improve handling, traction, and performance. Wet conditions are drained by the tread design. To prevent hydroplaning, this channels water.

Let water drain from the tyre. On wet roads, a tire's tread pattern improves traction and safety. Water is dispersed away from the tire's contact patch by tread grooves and channels. Hydroplaning prevention is this. Water can prevent traction and cause sliding on wet roads. Water is evacuated through the tread pattern's channels, retaining road contact and grip. For road safety and performance in all weather situations, the tread pattern delivers traction on dry roads and superior handling.

The tread pattern on a tire serves several purposes, including providing traction on different road surfaces, improving handling, and enhancing the tire's performance in various weather conditions. One essential function of the tread pattern is to allow water to flow away from the tire's contact patch during wet conditions. This helps prevent hydroplaning by channeling water away and maintaining proper contact between the tire and the road, ensuring better grip and safety.

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Average speed = (distance rolled) / (time to roll the distance)

Average speed = (32 meters) / (0.8 sec)

Average speed = (32/0.8) (meters/sec)

Average speed = 40 m/s .

I don't know.  That's just a hair under 90 miles per hour.  Is this reasonable for a bowling ball ?  Does anybody roll a bowling ball as fast as a major league pitcher pitches a hardball ? ?

Answer:

I. Electromagnetic waves

Explanation:

Answer:

I. Electromagnetic waves

Explanation:

Answer: [tex]2m/s^{2}[/tex]

Explanation:

Assuming the car is moving only in one direction (to the South), its acceleration [tex]a[/tex] is given by the following formula, which expresses the variation of the velocity in time:

[tex]a=\frac{\Delta V}{\Delta t}[/tex]   (1)

Where:

[tex]\Delta V=V_{2}-V_{1}=40m/s-10m/s=30m/s[/tex]   is the variation in velocity

[tex]\Delta t=t_{2}-t_{1}=15s-0s=15s[/tex] is the variation in time

Rewritting (1) with the calculated values:

[tex]a=\frac{30m/s}{15s}[/tex]   (2)

[tex]a=2m/s^{2}[/tex]  This is the acceleration of the car

Answer:

Asher cycles 12 miles in 16 hours. What is his speed?

Speed is a rate of distance to time.

Asher’s speed is 12 miles per 16 hours.

As a unit rate, his speed is 0.75.

Explanation:

just took quiz

Answer:

=1.667 A

Explanation:

For resistors connected in series, the same current flows trough all the resistors.

Therefore, V= IR (total)

V is the voltage of the supply, I the current through the circuit and R(total) the total resistance calculated calculated by adding the resistance of all the appliances in the circuit.

R (total) = 30+20+10= 60Ω as the value E can be replaced with Ω

V=IR

I=V/R

=100 V/ 60Ω

=1.667 A

Answer:

1.7A is the answer

Explanation:

Answer:

Mental map

Explanation:

A mental map is a person's point-of-view perception of their area of interaction.

This is a short answer, but I Hope this helps!

- Kylie

Answer:

Mental map is the correct answer.

Explanation:

If you imagine how to walk from your house to the bus stop, you are using a:​ Mental map.

It says that the force of a spring is always opposite to the direction in which you stretch it or compress it. (the direction of 'x')

In other words, a spring that's disturbed always tries to put itself back to it's normal length, where x would be zero.

To find the volume of 2400kg of gasoline with a density of 0.7g/cm³, convert the mass to grams and then divide by the density, yielding a volume of 3,428,571.43 cm³ or 3428.571 L.

The question asks for the volume of 2400kg of gasoline, given the density of petrol is 0.7g/cm³ (not g/km³ as mentioned in the question, which seems to be a typo). To calculate the volume, use the formula Volume = Mass / Density. First, convert the mass of gasoline from kilograms to grams (since the density is given in grams per cubic centimeter), which is 2400kg * 1000g/kg = 2,400,000g. Then, divide this by the density of petrol to find the volume. Hence, Volume = 2,400,000g / 0.7g/cm³ = 3,428,571.43 cm³ or 3428.571 L (since 1,000 cm³ is equivalent to 1 L).

Answer:

B

Explanation:

The image that illustrates refraction in the question above  is : ( B ) Image B

Refraction is the change in direction of wave passing through a medium due to change in speed of the traveling wave. The first image  represents a reflection as the wave does not pass through the medium but bounces off the medium.

The second image shows that the wave passes through the medium but changes its direction,  therefore it represents refraction.

Hence, we conclude that the image that illustrates refraction in the question above  is : ( B ) Image B

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Answer:

Answer is C.

Explanation:

To calculate the IMA for a wheel and axle, find the ratio of the larger radius to the smaller radius:

IMA = R/r

IMA = 9/3

IMA = 3

Answer:

Option A. Both Technicians A and B

Explanation:

Both technicians are correct. There are fundamentals that have to be understood regarding cooling systems.

The cooling system depends on a thermodynamic system that involves the expansion and compression of the cooling fluid. In addition, the coolant is the one that circulates in the pipes influencing convention currents between the pipes (coiled pipes) or otherwise. It is noteworthy that the dryer be kept out of the reach of moisture as this will corrode. Therefore, a drier that comes in contact with moisture needs to be replaced as this brings about corrosion.

In addition, it is also very important to remove the refrigerant from the system so that there will not be extreme fluctuations in temperature and pressure. In order to be on the safe side, the refrigerant needs to be replaced.  

Final answer:

Both Technician A and Technician B are correct regarding AC system maintenance. Technician A advises replacing the drier after long exposure, while Technician B recommends making repairs before evacuating the refrigerant. Budgeting 1.1 hours of service time may need to be re-assessed based on statistical analysis.

Explanation:

The question seems to pertain to the maintenance and repair practices associated with air conditioning (AC) systems, touching on subjects like cooling system exposure, drier replacement, and refrigerant evacuation. Technician A advises that a drier should be replaced if the cooling system has been exposed to air for more than 24 hours. This is generally correct because prolonged exposure to moisture can contaminate the drier, which is tasked with absorbing moisture in the system. On the other hand, Technician B suggests that repairs should be made before refrigerant is evacuated. This is also generally correct as it prevents wasting refrigerant and ensures that any leaks or issues are dealt with prior to recharging the system. Therefore, the correct answer is that both technicians are correct.

When it comes to air conditioner maintenance, as described in the reference, understanding the average servicing time and standard deviation is crucial for planning and resource allocation. Budgeting 1.1 hours per technician based on the company's service records may or may not be sufficient depending on the actual time taken to service units, which varies according to a normal distribution. If the normal distribution assumption holds, using the mean and standard deviation provided, one can use statistical analysis to determine the probability that the average service time will exceed 1.1 hours.

In AC systems, the condenser is the component responsible for converting gaseous refrigerant back into a liquid form. This process releases the absorbed heat to the outside environment.

The efficacy of an air conditioner is often measured in terms of its thermal energy removal capacity, with common units being watts or BTU/hr. AC systems can be categorized as vapor compression systems, vapor absorption systems, and open-loop evaporative systems, all of which use the evaporation of fluid to remove heat from the air.

Answer:

Charge on each is 2 x 10⁻¹⁰.

Explanation:

We know that Force between two point charges is given b the Coulomb's law as:

F = kq₁q₂/r^2

k = 9 x 10^9

r = 3.00 cm

= 0.03 m

q₁ = q₂

F = 4.00 x 10^-7

Rearranging the formula, we get:

F = k q²/r²

q² = Fr²/k

q² = 4 x 10⁻⁷ x 0.03²/(9x10⁹)

q² = 4 x 10⁻²⁰

q = 2 x 10⁻¹⁰

As there is force of repulsion between the charges, the charges must be both positive or both negative.

Answer:

Explanation:

The conversion of water into steam involves various factors and changes.

When heat is applied to water, the bond between the molecules start to loosen up and molecules starts separating hence it from changes from liquid to gas or steam.

At this time molecules have greater kinetic energy which is given to them in form of heat. Hence apart from all options given, D is the correct one which states that :

"When water changes to steam bonds between molecules break apart. After reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms."

Answer:

When water turns to steam,

D) the water absorbs energy which causes the water molecules to have more kinetic and potential energy changing their configuration from a liquid to a gas.

Answer:A

Explanation:

Answer:

Minimum amount

Explanation:

There's no way for me to really explain it well but its the correct a p e .x answer

Ampere's Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.

Ampere's Law states that the line integral of the magnetic field around an electric current is proportional to the current, helping in calculating the magnetic field generated by current-carrying wires.

Ampere's Law is a fundamental physical law in electromagnetism, stating that the line integral of the magnetic field (B) around an electric current is proportional to the current (I). This means that for any closed loop, the sum of the magnetic field dot products along the loop is equal to the permeability constant (µ₀) times the current passing through the loop. Mathematically, Ampere's Law is expressed as ∫ B ⋅ dl = μ₀I, where B is the magnetic field, dl is a differential element of the loop C, and μ₀ is the magnetic constant.

Ampere's law helps in determining the magnetic field generated by complex configurations of electric current by breaking it down into segments, each producing a magnetic field as if it was from a long straight wire. The resultant magnetic field is the vector sum of the fields due to each of these segments.

Answer:

China, US, India, and Russia

Answer:

m

≈

3.878

Kg

Explanation:

By Newton's second law,

F  = m a

So, W = m g

 m = W /g

m=32/ 8.25  Kg or 3.878  Kg (approx)

your answer would be 27.

The ratio of kinetic energy of ball A to ball B is 27

Answer: Option D

Explanation:

The kinetic energy of any object is the energy exhibited by the object when it is in motion. The kinetic energy of any object is directly proportional to the mass of the object and square of the speed at which the object is moving. So the kinetic energy of any object can be represented as

                 [tex]E_{k}=\frac{1}{2} \times m \times(\text { speed })^{2}[/tex]

In this case, for ball B the mass is 1 kg and speed is 1 m/s. So the kinetic energy of ball B is

            [tex]\text { Kinetic energy for ball } B=\frac{1}{2} \times 1 \times 1^{2}=0.5 J[/tex]

As it is said that the mass (M) and speed of ball A is three times the mass and speed of ball B.  So ,

         [tex]\text { M of ball } A=3 \times M \text { of ball } B=3 \times 1=3 \mathrm{kg}[/tex]

And,

           [tex]\text { Speed of ball } A=3 \times \text { Speed of ball } B=3 \times 1=3 \mathrm{m} / \mathrm{s}[/tex]

Thus, the kinetic energy of ball A will be

            [tex]\text {Kinetic energy for ball } A=\frac{1}{2} \times 3 \times 9=13.5 \mathrm{J}[/tex]

Now, to determine the ratio of kinetic energy of ball A to ball B,

[tex]\text { Ratio of kinetic energy }=\frac{\text {Kinetic energy of Ball } A}{\text {Kinetic energy of Ball } B}=\frac{13.5}{0.5} = 27[/tex]