Warm front
Stationary front
Occluded front
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
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 car moved a total distance of 120 km in 90 minutes. What was the speed of the car?
Answer:
80 km/hr
Explanation:
We are given that
Total distance covered by the car=120 Km
Time taken by the car=90 minutes=[tex]\frac{90}{60}=1.5 hour[/tex]
We have to find the speed of the car
We know that Speed=[tex]\frac{Distance}{time}[/tex]
Substitute the value then, we get
Speed=[tex]\frac{120}{1.5}=80 Km per hour[/tex]
Hence, the speed of the car=80 km per hour.
in a solution of seawater water is the solute true or false??
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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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.
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
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
How does the elbow medical and lateral epicondylitis?
The motor of a crane uses power p to lift a steel beam. by what factor must the motor's power increase to lift the beam twice as high in half the time?
The power factor required to lift the beam twice as high in half the original time is : 4
Given that :
Power ( P ) = Work done / time -- ( 1 )
Also work done for a lifted load
Work done = mgh ( mass * gravity * height )
Back to equation ( 1 )
Power ( p ) = mgh / time --- ( 2 )
Considering the conditions given
When; h = 2 * h and t = 1/2 * t
Power becomes
New Power = m*g*2h / 1/2* t
= 4( m*g*h / 2
Therefore we can conclude that The power factor required to lift the beam twice as high in half the original time is : 4.
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When 108 grams of water at a temperature of 22.5c is mixed with 65.1 grams of water at an unknown temperature, the final temperature of the resulting mixture is 47.9c. what was the temperature of the other sample of water?
Final answer:
To determine the initial temperature of the 65.1 grams of water, the concept of heat transfer is applied, utilizing the formula q = mcΔT and setting the heat lost by the 108g water equal to the heat gained by the 65.1g water.
Explanation:
To find the initial temperature of the 65.1 grams of water before mixing, we can use the concept of heat transfer and the principle that the total heat lost by the warmer substance is equal to the total heat gained by the cooler substance. The formula for calculating heat (q) is q = mcΔT, where m is the mass in grams, c is the specific heat capacity (for water, c = 4.18 J/g°C), and ΔT is the change in temperature.
For the 108 grams of water cooling down: q = (108g)(4.18 J/g°C)(47.9°C - 22.5°C).
For the 65.1 grams of water heating up: q = (65.1g)(4.18 J/g°C)(47.9°C - T), where T is the initial temperature of the 65.1g water sample.
By setting the heat lost by the 108g water equal to the heat gained by the 65.1g water and solving for T, the initial temperature of the 65.1 grams of water can be determined.
After calculations, the initial temperature of the unknown sample of water is determined to be 90.01°C.
To find the unknown temperature of the 65.1 grams of water, we need to apply the principle of conservation of energy. The heat gained by the 108 grams of water at 22.5°C must equal the heat lost by the 65.1 grams of water at the unknown temperature.
Using the formula for heat transfer:
Q = mcΔT,
where:
Q is the heat absorbed or released,m is the mass,c is the specific heat capacity (for water, c = 4.18 J/g°C), andΔT is the change in temperature.Step-by-Step Calculation:
Calculate the heat gained by the 108 g of water:
Q_gained = (108 g) * (4.18 J/g°C) * (47.9°C - 22.5°C).
Q_gained = 108 g * 4.18 J/g°C * 25.4°C = 11472.912 J.
Let T be the initial temperature of the 65.1 g of water. Calculate the heat lost by this water:
Q_lost = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).
Since heat gained = heat lost, set Q_gained equal to Q_lost:
11472.912 J = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).
Solve for T:
11472.912 J = 272.418 J/°C * (T - 47.9°C).
11472.912 J / 272.418 J/°C = T - 47.9°C.
42.11°C = T - 47.9°C.
T = 42.11°C + 47.9°C.
T = 90.01°C.
Therefore, the temperature of the other sample of water was 90.01°C.
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.
which describes the relationship between photon energy and frequency?
high energy photons have high frequencies hope this helps brother
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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In the graph, a sample of water is heated from 40 degrees Celsius to 100 degrees Celsius. Which statement correctly describes the curve?
A) QR- liquid only
RS- phase change liquid-gas
ST- gas only
B) QR- liquid only
RS- phase change liquid-solid
ST- solid only
C) QR- solid only
RS- phase change solid-liquid
ST- liquid only
D) QR- phase change solid-liquid
RS- liquid only
ST- phase change liquid-gas
Answer:
The statement that correctly describes the curve is : ( A )
QR - liquid only RS - phase change liquid-gasST - gas only Phase changeGiven that the temperature is at 40 degrees the water is at its liquid state while at the plateau stage ( RS ) the liquid water changes its state to gaseous. At curve ST when the temperature ≥ 100 degree the state of the sample of water becomes gas only.
Hence we can conclude that the statement that describes the curve is statement A
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Materials in which electric charges move freely such as copper and aluminum are called
Answer:
Conductors allow electric charges to move freely
How does Coulomb's Law and electric charge cause your hair to stand on edge when it is really dry outside and you walk across the carpet?
Equus caballus is the scientific name for a domestic horse. Equus zebra is the scientific name for a zebra. Which of the following statements is true?
1. The domestic horse belongs to the Equus order.
2. The domestic horse belongs to the caballus genus.
3. The zebra and domestic horse belong to the same species.
4. The zebra and domestic horse belong to the same genus.
Answer:
The zebra and domestic horse belong to the same genus.
Explanation:
Did on odyssey
In what ways are Terrestrial planets different from Jovian planets?
what is the difference between series and parallel circuits and examples of when you would use them ?
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
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?
What kind of lenses are in a light microscope
Light microscopes use glass or plastic lenses to magnify specimens, consisting of an objective lens and an eyepiece. They can magnify up to 2000 times, but the resulting image is upside-down and reversed. Staining may be required for transparent cell components, although this often kills the cells.
Explanation:The lenses found in a light microscope are typically made of glass or plastic and are designed to focus light on the specimen to produce an image. The most basic type is the compound microscope which consists of two main types of glass lenses: the objective lens and the eyepiece or ocular lens. The objective lens, which is near the specimen, often has a range of magnification powers from 5x to 100x. These objective lenses are usually parfocal, meaning they are set up so that the sample remains in focus when the objectives are switched. The eyepiece then further magnifies this image. Together, these lenses allow for a significant magnification of the specimen, causing an upside-down and reversed image due to the nature of the optics involved. Light microscopes are commonly used because they are suitable for viewing living organisms, but sometimes staining is necessary to make transparent cell components visible, which usually results in the death of the cells.
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
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.
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.
A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist’s resultant displacement?
magnitude: 13.0 mi; direction: 22.6° north of east
magnitude: 13.0 mi; direction: 67.4° north of east
magnitude: 10.9 mi; direction: 67.4° north of east
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.
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 car is travelling at 20 km/hr.It speeds upto 60 km/hr in 6 seconds.What is its acceleration?