Total internal reflection causes light to be completely reflected across the boundary between the two media but not transmitted.
What is total internal reflection?The term total internal reflection occurs when light is moving from a denser to a less dense medium such as from glass to air. This phenomenon occurs at the interface between the two media.
There are two conditions necessary for total internal reflection and they are;
1) Light must travel from a denser to a less dense medium
2) The angle of incidence in the denser medium must be greater than the critical angle.
Total internal reflection causes light to be completely reflected across the boundary between the two media but not transmitted.
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Determine the frequency of the radar wave. [Show all calculations, including the equation and substitution with units.]
The frequency of the radar wave is 4.166 Hz.
What is wavelength?The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.
Wavelength λ = 1/f
A 0.12-meter-long electromagnetic (radar) wave is emitted by a weather station and reflected from a near by thunderstorm.
The radar wave travels double the distance 0.12 m.
λ = 2 x 0.12 = 0.24 m
Then, the frequency of the radar wave is
f= 1 / 0.24
f =4.166 Hz
Thus, the frequency of the radar wave is 4.166 Hz.
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A locomotive (toy) travels at a velocity of 25 m/s for 10 s, then at 10 m/s for 5 minutes. What is the total distance covered?
A).3250m B). 4257 m C). 5200 D). The answer is not given
The total distance covered by the locomotive (toy) during the first and second journey is 10500 meters.
D) The answer is not given in the Options.
What is the total distance covered?Note that: Speed/velocity is distance traveled per unit time.
Speed = Distance ÷ time
Distance = velocity × time
Given that;
For the first journey,
velocity v = 25m/selapsed time t = 5min = (5×60)s = 300sFor the second journey,
velocity v = 10m/selapsed time t = 5min = (5×60)s = 300sDistance covered in the first journey
Distance = velocity × time
Distance = 25m/s × 300s
Distance = 7500m
Distance covered in the second journey
Distance = velocity × time
Distance = 10m/s × 300s
Distance = 3000m
Total distance covered will be;
Total Distance = Distance covered in the first journey + Distance covered in the second journey
Total Distance = 7500m + 3000m
Total Distance = 10500m
Therefore, the total distance covered by the locomotive (toy) during the first and second journey is 10500 meters.
D) The answer is not given in the Options.
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Two identical spring scales are each attached to a cord that is wrapped around a pulley. the two pulleys have identical mass
just need help with this explain
Answer:
B
Explanation:
mass is the amount of matter present in any object or body.
here in the option b, it says they each contain the same amount of matter,
which means they each has the same mass.
Thanks for helping!!!------>
a 15.3 g bullet moving with a speed of 372 m/s. Answer in units of kg · m/s.
Answer:
56.916 kg m/s
Explanation:
Convert g to kg 15.3 g = .153 kg
.153 kg * 372 m/s = 56.916 kg*m/s
What is the magnetic field strength at point 1 in the figure? (figure 1)
The magnetic field strength at point 1 in the figure will be 6.67 ×10⁻⁵ T.
What is magnetic field strength?The number of magnetic flux lines on a unit area passing perpendicular to the given line direction is known as induced magnetic field strength .it is denoted by B.
The magnetic field strength is found as;
[tex]B = \frac{\mu_0I}{2r} \\\\ \mu_0 = 4 \PI \times 10^{-7}[/tex]
In the formula,I denote current, and r denotes the distance between the point and the current carrying wire and magnetic field due to current in the bottom wire.
At point 1, the net magnetic field is found as the sum of magnetic field due to current in the top wire.
[tex]\rm B_{net} = B1_+(-B_2)[/tex]
[tex]B = \frac{ 4 \PI \times 10^{-7}I}{2r} \\\\ \rm B_{net} = B_1_+(-B_2)\\\\ \rm B_{net} = \frac{4 \times \pi \times 10^{-7} \times 10}{2 \times \pi \times 0.02} -\frac{4 \times \pi \times 10^{-7} \times 10 }{2 \times \pi \times 0.06} \\\\\ \rm B_{net} = 6.67 \times 10^{-5} T[/tex]
Hence, the magnetic field strength at point 1 in the figure will be 6.67 ×10⁻⁵ T.
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PLEASE HELP QUICK GIVING AWAY 74 POINTS
add number: Mercury, Venus, Earth, Mars. Terrestrial, rocky.
add number: The spinning of a planet on its axis, causing day and night.
add number: A force of attraction that keeps planets orbiting the sun.
add number: A group of objects that orbit a star.
add number: The orbit of a planet around the sun. On Earth, one year.
add number: The idea of that the Earth and planets orbit the sun. A sun-centered view.
add: number: A rock that has entered Earth's atmosphere, leaving a streak of light in the night sky.
add number: Jupiter, Saturn, Uranus, Neptune. Gas giants.
add number: The theory the universe came forth from a single spot in an enormous explosion.
add number: Huge clusters of stars, gas, and dust bound by the force of gravity.
1.
Big Bang
2.
Doppler Effect
3.
Nebula
4.
Solar System
5.
Geocentric theory
6.
Heliocentric theory
7.
Gravity
8.
Galaxy
9.
Rotation
10.
Revolution
11.
Inner planets
12.
Outer planets
13.
Meteor
14.
Meteorite
15.
Meteoroid
add the right numbers to the things that say add number
Mercury, Venus, Earth, Mars. Terrestrial, rocky : 11
The spinning of a planet on its axis, causing day and night :9
A force of attraction that keeps planets orbiting the sun : 7
A group of objects that orbit a star : 8
The orbit of a planet around the sun. On Earth, one year : 10
The idea of that the Earth and planets orbit the sun. A sun-centered view : 6
A rock that has entered Earth's atmosphere, leaving a streak of light in the night sky : 13
Jupiter, Saturn, Uranus, Neptune. Gas giants : 12
The theory the universe came forth from a single spot in an enormous explosion: 1
Huge clusters of stars, gas, and dust bound by the force of gravity: 8
What is Galaxy?The group of many stars along with interstellar gases, rocks and dust material.
Thus, the numbers are added in front of the sentences.
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What is the KE of a 4500kg at a speed of 20 m/s?
Answer:
900kJ
Explanation:
The formula to find the kinetic energy is :
[tex]E_k=\frac{1}{2} mv^{2}[/tex]
Here,
m ⇒ mass ⇒ 4500 kg
v ⇒ velocity ⇒ 20 m/s
Let us find it now.
[tex]E_k=\frac{1}{2} mv^{2}[/tex]
[tex]E_k=\frac{1}{2} *4500*20^{2}[/tex]
[tex]E_k=\frac{1}{2} *1800000[/tex]
[tex]E_k=900000J[/tex]
[tex]E_k=900kJ[/tex]
Quasars are...
*
1 point
Areas with high activity in the centers of new galaxies
Gas Giant planets like Jupiter, but in other solar systems
Rocky planets like Earth or Mars, but in other solar systems
A pair of stars that are orbiting each other, so their spectrum keeps changing
Answer:
A quasar is an extremely luminous active galactic nucleus, powered by a supermassive black hole, with mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.
Explanation:
first!
Which action would a chemist most likely take to determine how the
substances in a fuel affect the types of pollutants it produces when burned in
a car engine?
A PUC test would be the most likely course of action for a chemist. It is the most effective method for figuring out how the components of gasoline impact the kinds of pollutants.
What is air pollution?The vapors created by gasoline evaporation and the chemicals produced by gasoline combustion cause impurity in the air known as air pollution.
When gasoline is burned, it emits carbon dioxide, a greenhouse gas.
Hence, the chemist's most likely action would be to do a PUC test.
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what is the planet's rotational speed from slowest to fastest?
Answer:
Jupiter is the fastest whereas Venus is the slowest
A ray of monochromatic light (f = 5.09 × 10^14 hertz) in air is incident at an angle of 55°
Answer:
5161.26
Explanation:
5.09X1014=5161.26
A disk with radius of 0. 5 m is free to rotate around its center without friction
The angular speed can't be determined without knowing the rotational inertia of the disk. The correct option is D.
What is rotational moment of inertia?It is the quantitative measure of the inertia when a body is rotating.
Given, radius of disk R= 0.5 m, Force F=2N, then torque developed will be
τ = F x R = 2 x 0.5 =1N..m
If m is the mass of disk, the rotational moment of inertia about center of disk is
I = mR²/2 = m(0.5)²/2 = m/8 kg.m²
The angular acceleration is α =τ/I = 1/(m/8) =8/m
Angular velocity ω =ω₀ +αt = 0+(8/m) x 1 =8/m rad/s
Thus, the correct option is D.
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Planetary Nebula/White Dwarf Stars - Little Ghost Nebula. Some red giant stars develop into planetary nebulas as their cores continue to contract, to increase in temperature, and to burn and vent the remaining gases into interstellar space. Eventually, the core collapses to the point where it is hot enough to ionize the vented gases, forming a relatively short-lived (~10,000-20,000 years) planetary nebula. The remaining core collapses into a white dwarf star. The vented materials from the planetary nebula play an important role in enriching the universe in elements with atomic weights less than 26 (forming the basis for carbon-based life like ourselves!). Which type of star will form a planetary nebula
Smaller stars, like our sun, die by ejecting their outer layers of gas into space, resulting in the formation of a planetary nebula.
How planetary nebula formed?A planetary nebula is formed when a red giant ejects its outer atmosphere. A white dwarf is the carbon core of a star that has lost its photosphere.
This results in a one-of-a-kind and breathtaking creation known as a planetary nebula.
Smaller stars, like our sun, die by ejecting their outer layers of gas into space over a 10,000-year period, leaving behind the star's heated core.
Radiation from the white dwarf causes the gas to shine, resulting in a one-of-a-kind and stunning creation known as a planetary nebula.
The carbon core of a red giant that has evacuated its photosphere as a planetary nebula is a white dwarf.
Hence, Smaller stars, like our sun, die by ejecting their outer layers of gas into space type of star will form a planetary nebula
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uppose you are an astronaut and you have been stationed on a distant planet. You would like to find the acceleration due to the gravitational force on this planet so you devise an experiment. You throw a rock up in the air with an initial velocity of 6 m/s and use a stopwatch to record the time it takes to hit the ground. If it takes 6.8 s for the rock to return to the same location from which it was released, what is the acceleration due to gravity on the planet
Answer:
g = -3.143 m/s²
Explanation:
To determine acceleration due to the gravitational force, it can be used the following formula:
v = v₀ + gt, where:
v₀ is the initial velocity;
g is acceleration due to gravity
t is the time to return to the point of origin
Photovoltaic cells: a) have become more economical to produce and use over the past 25 years. b) are the most efficient means of converting solar energy to electricity. c) are currently only used in urban areas of highly developed countries. d) have only been adapted for use in small appliances.
Photovoltaic cells are the most efficient means of converting solar energy to electricity. Option b is correct.
What is a cell?A cell is a voltage and current-producing device that consists of a single anode and cathode separated by an electrolyte.
One or more cells can make up a battery. One cell, for example, is one AA battery.
Light intensity on a solar cell is often measured in "suns," with one sun roughly equivalent to 1 kW/m².
Concentrated sunlight improves the ratio of current generated while the device is lighted vs when it is dark, hence enhancing output voltage and efficiency.
Photovoltaic cells are the most efficient means of converting solar energy to electricity.
Hence, option b is correct.
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1. A person weighing 1200 N is supported on an inflated air pillow. The total area of the soles of his shoes is 0.1 m². Calculate the minimum pressure of the air inside the pillow.
Answer:
[tex]\huge\boxed{\sf P = 12,000 \ Pa}[/tex]
Explanation:
Given:Force = F = 1200 N
Area = A = 0.1 m²
Required:Pressure = P = ?
Formula:[tex]\displaystyle P = \frac{F}{A}[/tex]
Solution:[tex]\displaystyle P = \frac{1200 \ N}{0.1 \ m^2} \\\\P = 12,000 \ Pa\\\\\rule[225]{225}{2}[/tex]
Answer:
P=3750
Explanation:
P=F/A
P=1200N/0.1m²
Find the square root of 0.1
square root of 0.1=0.316622776601
Approximate it =0.32
P=1200N/0.32M
Cross multiple=1200N=P0.32M
divide both side by
3750=P, P=3750
Marking as brainliest last attempt
(ZOOM IN THE PHOTO)
write a paragraph about the topic : bullying in schools
Answer:
Bullying in the schools has negative effects on individual students and on the school climate as a whole. Bullying can cause long-term problems for both the victims of bullying and the bullies themselves. To explore the effects of bullying on adolescents, we will define bullying, identify the characteristics of bullies and victims, outline the extent and consequences of bullying, and present resources for further information and assistance.
Bullying is any behavior that is initiated by one or more students against a victim or victims that causes physical or psychological intimidation. Bullying behaviors can be classified as either direct (such as teasing, threatening, hitting, or stealing) or indirect (such as rumor spreading or social isolation). Boys typically employed direct methods of bullying, while girls tend to use in direct methods. Either way, behaviors must occur repeatedly overtime to be classified as bullying.
Characteristics of Bullies and Victims
There are specific behaviors that bullies tend to exhibit. The bullies often need to feel powerful and in control. They may feel no remorse when they inflict injury and suffering on others. Bullies tend to defy authority and are likely to break school rules. They seem to have little anxiety and appear to possess high self-esteem. Students who come from homes characterized by physical punishment tend to be more likely to exhibit these types of behaviors.
Victims also tend to exhibit specific characteristics. They are often anxious, insecure, cautious, and have low self-esteem. Victims tend to be socially isolated, and may lack social skills and friends. Because they tend to be weaker than their peers, either physically or socially, victims rarely retaliate against bullies. Students who have close ties with their parents/guardians or who have overprotective parents/guardians are more likely to be victimized by bullies.
A pulley system is used in an auto repair shop to lift a 200 kg engine block 1.5 m out of a car. The lower pulley is attached directly to the engine block, and there are 8 strands of rope attaching the lower pulley to the upper pulley. The repairman pulls through 12 m of rope in the process of lifting the engine block. How much work is done during this process
For a pulley system is used in an auto repair shop to lift a 200 kg engine block 1.5 m out of a car, work is done during this process is mathematically given as
w=3000J
What is the work is done?Generally, the equation for work done is mathematically given as
W=mgh
Therefore
W=200*10*1.5
w=3000J
In conclusion, work done
w=3000J
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Sherry and Ellen are talking about the factors that affect light scattering in the atmosphere. Sherry says one factor is the length of the path of sunlight. Ellen says one factor is altitude. Who is correct
Sherry who says one factor is the length of the path of sunlight is correct.
Factors affecting light scatteringThere are two main factors which affects light scattering, and they include the following;
the size of the particles wavelength of the lightlength of the path of sunlight is equivalent to wavelength of the light.
Thus, we can conclude that Sherry who says one factor is the length of the path of sunlight is correct.
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As you ride a bicycle on the sidewalk with a speed of
6.4 m/s, a ball suddenly rolls out in front of you. You hit the brakes and
come to rest in 3.8 m. How much time does it take you to stop?
Answer:
1.2 seconds
Explanation:
distance = ((final speed + initial speed) * time)/2
Here given:
distance: 3.8 meterinitial speed: 6.4 m/sfinal speed: 0 m/sSolving steps:
3.8 = ((0 + 6.4) * time))/2
3.8 = 3.2(time)
time = 3.8/3.2
time = 1.1875 seconds ≈ 1.2 seconds
An object is approaching you while making a sound.
What is perceived about the pitch of the sound?
It is perceived to be fluctuating.
It is perceived to be lower.
It is perceived to be higher.
It is perceived to be unchanged.
The pitch of the sound is perceived to be lower when an object is approaching you while making a sound.
What is sound?Sound is a type of vibration capable of propagating in a suitable media (e.g., air or water).
The sound waves are called acoustic waves and they have a well-defined frequency and amplitude.
In conclusion, the pitch of the sound is perceived to be lower when an object is approaching you while making a sound.
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where is the strongest force coming from on scissors
Answer:
the handle
Explanation:
what is formula for distance
Answer:
this is formula
Explanation:
The flag in front of Century High School is attached to a pully. The upward tension on the rope is 15 newtons and the downward tension on the rope is 18 newtons. What is the magnitude and direction of the net force?
3 newtons upward
3 newtons downward
From the statement in the question, the resultant force is 3N downward.
What is the resultant force?The term resultant force refers to a single force that will an effect tat is the same as that of the system of forces acting together.
Thus, if the upward force is 15 N and the downward force is 18 N, the resultant force will be; 18 N - 15 N = 3N downward.
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In a related practical activity, 2 litres of a gas were heated from 35 °C to 75 °C. If the pressure was kept constant, calculate the final volume of the gas.
Answer:
2.26l
Explanation:
From the general gas equation:
P1V1/T1 = P2V2/T2
Since pressure remained constant we can say:
V1/T1 = V2/T2
so to convert to kelvin add 273 to both temperature values then we can say:
1 m^3= 1000 L
2l=0.002m^3
Then;
0.002/308=V/348
V=(0.002/308)348
Final volume=0.002259m^3
=2.6l(1 decimal place)
Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?
Fp, Ff, and Fg
Fp and FN
Fp, FN, and Ff
Fp and Fg
The forces necessary for calculating the total force are Fp and Fg. The correct option is d.
What is gravity?The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.
The gravitational force, Fg is the attractive force exerted by the Earth on the object that is equal to the mass of the object times the gravitational acceleration.
Emmett is lifting a box vertically. There are only vertical forces acting on the box.
The vertical force must counteract the weight of the object, is the upward force applied on the object.
Thus, the forces necessary for calculating the total force is Fp - Fg.
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If a car travels 20 km at a speed of 20km/h, what will the speed be for the remaining 20km if the average speed of the journey is 24km/h?
Answer:
12
Explanation:
avarage speed = total distance/total time
our total distance is 40km
the first 20km speed was 20km/h, so the time os 1 hour here
for the next 20km, we dont have the time, so let the time here be = x
so total time is x+1 km/h
and total distance is 40km
and the avarage is 24km/h
so =>
[tex] \frac{40}{1 + x} = 24[/tex]
solve for x to find the time in the second 20km
so x=0.6
then find the speed of the second 20km by diving the distance on time =>
[tex] \frac{20}{0.6} = 12[/tex]
so the speed in the second 20km is 12km/h
What note is the sound wave below? (Assume the total time is 20 ms)
Answer:
D3
Explanation:
To determine the note, you will have to find the frequency of that sound wave
frequency is no. of cycles or oscillation that occurs per second
so according to the question for 3 oscillations, it took 20ms which is 20 × 10^-3 seconds then for 1 second that'd be
3×10^3 ÷ 20 = 150 Hz
then the note corresponding to frequency is D3
WILL GIVE BRAINLIEST IF YOU GET THEM ALL RIGHT!!! In this problem you shine a light on a square and you have to tell me which color the light will appear when shined on the square.
White color light falls on white object , it will appears black because it absorbs all the colors of spectrum.
White color light falls on red object , it will appears red because it absorbs all the colors of spectrum except red.
White color light falls on blue object , it will appears blue because it absorbs all the colors of spectrum except blue.
Red color light falls on white object , it will appears Red.
Red color light falls on Red object , it will appears Red.
Red color light falls on Green object , it will appears black.
Green color light falls on white object , it will appears green.
Green color light falls on Red object , it will appears black.
Green color light falls on Green object , it will appears green.
Purple color light falls on white object , it will appears Purple.
Purple color light falls on Red object , it will appears black.
Purple color light falls on Blue object , it will appears black.
What is white light?White light is the light from the sunlight incident on the surface to appear their color.
Thus, for each colored light and colored square, appearing color is find out.
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