Explanation:
With the change in medium the speed of light wave travel changes. Therefore, the absolute refractive index changes. The speed of light is maximum is vacuum and changes with the change in medium. This is the refractive indices of different medium are different.
The refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
What is a refractive index?The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
When the refractive index of a substance is increased, the speed of light in the material decreases.
The speed at which light waves travel changes as the medium changes. The absolute refractive index changes.
As a result, the speed of light is greatest in a vacuum and decreases as the medium changes. This is due to the fact that the refractive indices of various media are different.
Hence the refractive index is the characteristic of the wave that can not change as the wave enters the second medium.
To learn more about the refractive index refer to the link;
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During which season of the year will your nails grow most quickly?
summer
spring
fall
winter
Answer:
summer
Explanation:
Sound waves are simultaneously interpreted through air (going through the external,
middle, then inner ear) and through the bone in the inner ear, stimulating the
acoustic nerve.
True
False
Answer:
its true
Explanation:
i took it
The alarm at a fire station rings and a 87.5-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.10 m). Just before landing, his speed is 1.75 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole?
Answer:
[tex]F_f=840N[/tex]
Explanation:
From the question we are told that
Weight of fireman [tex]W_f= 87.5kg[/tex]
Pole distance [tex]D=4.10m[/tex]
Final speed is [tex]V_f 1.75m/s[/tex]
Generally the equation for velocity is mathematically represented as
[tex]v^2 = v_0^2 + 2 a d[/tex]
Therefore Acceleration a
[tex]a'= v^2 / 2 d[/tex]
[tex]a'= 0.21m/s^2[/tex]
Generally the equation for Frictional force [tex]F_f[/tex] is mathematically given as
[tex]F_f=m*a[/tex]
[tex]F_f=m*(g-0.21)[/tex]
[tex]F_f=87.5*(9.81-0.21)[/tex]
Therefore
[tex]F_f=840N[/tex]
What is the Potential Energy of a spring stretched 5.0 cm that has a
spring constant of 79 N/m?
Answer:
The Potential Energy of the stretched spring is = 1.975 J
Explanation:
Recall that the potential energy of a spring of constant k stretched x\a distance x is given by the formula:
U = 1/2 k x^2
Therefore in our case, converting the stretch from cm of meters (0.05 m), this is
U = 1/2 * 79 * 0.05 J = 1.975 J
A horse is working steadily, providing 750 W of output power. How much food energy does the horse need to work for 1 hour, to the nearest MJ
Answer:
Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.
Explanation:
Since horse is working steadily, the power experimented by the horse ([tex]\dot W[/tex]), measured in watts, is at constant rate. Then, the work needed by the horse ([tex]W[/tex]), measured in joules, is equal to that power multiplied by time ([tex]\Delta t[/tex]), measured in seconds. That is:
[tex]W = \dot W\cdot \Delta t[/tex] (1)
If we know that [tex]\dot W = 750\,W[/tex] and [tex]\Delta t = 3600\,s[/tex], then the work needed for the horse is:
[tex]W = (750\,W)\cdot (3600\,s)[/tex]
[tex]W = 2.7\times 10^{6}\,J[/tex]
[tex]W = 2.7\,MJ[/tex]
Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.
If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity in km/h for the entire trip
Answer:
speed v = 0.148 m / s
velocity v = 0
Explanation:
In this exercise we must be careful that the speed is a scalar and the speed is a vector, let's start by looking for the speed
v = Δx /Δt
the distance traveled is x = 2d and the time taken is
t = 7h 30 min
let's reduce to seconds
t = 7 h 3600s / 1h + 30 min 60s / 1min = 27000 s
so the speed is
v = 2d / 27000
to finish the calculation suppose a distance traveled d = 2000 m
v = 2 2000/27000
v = 0.148 m / s
this is the raides which is the speed module
Velocity is a vector,
v = Dx / Dt
in this case the displacement is
Dx = d -d
Dx = 0
the total displacement is zero since it returns to the starting point, consequently the velocity is zero
v = 0
bold is a vector
Which statements compare linear and angular momentum? Check all that apply.
Both measure the tendency of objects to resist a change in motion.
Both are affected by the mass of the object in motion.
Both are affected by the distribution of mass relative to an axis.
Both involve velocity.
Both involve rotation.
Answer:
A,B,D
Explanation:
cause ik
On a circular racetrack with a radius of 3.23 m, a certain road car set a speed record of 3.72
m/s. If the car had a mass of 250 kg, what was the net force acting on it?
Answer:
F = 1071.08 N
Explanation:
Given that,
The radius of the circular track, r = 3.23 m
Speed of the car, v = 3.72 m/s
The mass of the car, m = 250 kg
We need to find the net force acting on it. The centripetal force will act on it and it is given by the relation as follows :
[tex]F=\dfrac{mv^2}{r}\\\\F=\dfrac{250\times (3.72)^2}{3.23}\\\\F=1071.08\ N[/tex]
So, the net force acting on the car is 1071.08 N.
what is rhe average velocity od a baseball dropped from rest that falls for 2 seconds?
Answer:
19.6m/s
Explanation:
Given parameters:
Initial velocity = 0m/s
Time = 2s
Unknown:
Average velocity = ?
Solution:
We can use the final velocity of the ball before landing to determines its average velocity ;
Using;
v = u + gt
v is the final velocity
u is the initial velocity
g is the acceleration due to gravity
t is the time
v = 0 + 9.8 x 2 = 19.6m/s
54:29
Mason notices that his boat sinks lower into the water in a freshwater lake than in the ocean. What could explain
this?
The boat is more dense in salt water.
The boat is less dense in salt water.
Salt water is less dense than freshwater
O Salt water is more dense than freshwater
Save and Exit
Sube
Mark this and retum
Answer:
Salt water is more dense than freshwater
Explanation:
The only and best explanation for this phenomenon for this occurrence is that salt water is more dense than freshwater.
Density is the mass per unit volume of a substance. When a substance is A more dense than the other substance B, B will float on A. So, the density of the salt water is higher than that of the fresh water because it has more particles per unit volume compared to fresh water. Therefore, the boat will go farther into the fresh water compared to the salt water.A record rotates on a turntable at 33 rpm. You may want to review What is the angular speed in rad/s?
Answer:
the angular speed in rad/s is 3.45
Explanation:
The computation of the angular speed in rad/s is as follows:
As we know that
1 rpm means 1 revolution per minute
Also 1 minute = 60 seconds
SO, for 33 rpm, the angular speed is
= 33 ÷ 60 × 2π
= 3.45 rad/s
As the revolution is of 360 degrees i.e. equivalent to 2π
Hence, the angular speed in rad/s is 3.45
Migration is the seasonal movement of a population of organisms from one place to another True or false
Answer:
true lol its jist common sense
Answer: Seasonal migration is the movement of various species from one habitat to another during the year. Resource availability changes depending on seasonal fluctuations, which influence migration patterns. ... Many species, especially birds, migrate to warmer locations during the winter to escape poor environmental conditions.
Explanation:
Helppp plssss I am needing help for science and there is a photo pls answer
Answer:
sorry I don't really know :P
Explanation:
Answer:
how many of those questions do you need answers to?
Explanation:
a proton travelling along is x-axis is slowed by a uniform electric field E. at x = 20.0 cm, the proton has a speed of 3.5x10^6 m/s and at 80.0 cm the speed is zero. Determine the magnitude and direction of e,
Answer:
[tex]E=101955.8volt/m[/tex]
The electric field direction is toward the right
Explanation:
From the question we are told that
Initial X-co-ordinate of proton [tex]X_1=20.0cm => \frac{20}{100}m[/tex]
Initial speed of Proton [tex]V_1= 3.5*10^6 m/s[/tex]
Final X-co-ordinate of proton [tex]X_2=80.0cm => \frac{80.0}{100}m[/tex]
Final speed of Proton [tex]V_2=0[/tex]
Generally the mass of Proton is given by
[tex]m_P=1.67*10^-27[/tex]
Generally the kinetic energy of the proton is mathematically given by
[tex]K.E_p=1/2mv^2[/tex]
[tex]K.E_p=1/2*1.6*10^-^2^7*(3.5*10^6)^2[/tex]
[tex]K.E_p=9.8*10^-^1^5[/tex]
Generally the change in electric potential [tex]\triangle V[/tex] is mathematically given by
[tex]\triangle V =\frac{K.E_p}{q}[/tex]
Charge on a proton [tex]q=1.602*10^-^1^9[/tex]
[tex]\triangle V =\frac{9.8*10^-^1^5}{1.602*10^-^1^9}[/tex]
[tex]\triangle V =61173.5volts[/tex]
Generally the equation for magnitude of an electric field is mathematically given by
[tex]E=\frac{\triangle V}{\triangle d}[/tex]
Where
[tex]d=0.8m-0.2m\\d=0.6m[/tex]
Therefore
[tex]E=\frac{61173.5}{0.8-0.2}[/tex]
[tex]E=\frac{61173.5}{0.6}[/tex]
[tex]E=101955.8volt/m[/tex]
The direction of the charge is towards the right
A material that restricts the flow of electricity or thermal energy is a what
Answer: Insulator
Explanation:
An insulator is a material that restricts the flow of electricity or thermal energy.
Answer:
plastic or wood
Explanation:
A 2.5 kg tribble is placed in a bucket and whirled in a 1.4 m radius vertical circle at a constant tangential speed. If the force on the tribble from the bucket does not exceed 10 times its weight (tribbles are a hardy species), the maximum tangential speed is
Given that,
Mass of a tribble, m = 2.5 kg
Radius, r = 1.4 m
The force on the tribble from the bucket does not exceed 10 times its weight.
To find,
The maximum tangential speed.
Solution,
The force acting on the tribble is equal to the centripetal force.
F = 10mg
The formula for the centripetal force is given by :
[tex]F=\dfrac{mv^2}{r}[/tex]
v is maximum tangential speed
[tex]v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{mgr}{m}} \\\\v=\sqrt{{10gr}} \\\\v=\sqrt{10\times 9.8\times 1.4} \\\\v=11.7\ m/s[/tex]
So, the maximum tangential speed is 11.7 m/s.
How much work would be needed to lift the ball from the 2-m shelf to the 5-m shelf, and how much potential energy would it have on the 5-m shelf?
Answer:
a) 2.94 N
b) 4.90 N
Explanation:
Let us assume that the weight of the ball is 0.98 N
Solution:
a) An object’s gravitational potential energy depends on two factors which are height and its weight (or mass). The equation for gravitational potential energy (PE) is given as:
Potential energy = weight (w) * height (h)
PE = wh
Potential energy at 2 m shelf = weight * height = 0.98 N * 2 m = 1.96 N
Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N
The work needed to lift the ball from the 2-m shelf to the 5-m shelf = Potential energy at 5 m shelf - Potential energy at 2 m shelf
The work needed to lift the ball from the 2-m shelf to the 5-m shelf = 4.90 N - 1.96 N = 2.94 N
b) Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N
If you live in the southern hemisphere, what season would you be experiencing in position C this diagram?
A)
Fall
B)
Summer
C)
Winter
D)
Spring
what is one reason that john adams and benjamin franklin believed the articles of confederation should be revised.
Answer:
Explanation:
Their most intimate experience probably happened during an unsuccessful peace mission in September 1776. The British forces had recently raced across Long Island (New York) and almost destroyed the American Army. The British commander, Adm. Lord Richard Howe, then offered peace. Congress sent Adams, Franklin, and Edward Rutledge (South Carolina) to meet Howe on Staten Island.
Howe hoped to resolve the differences between what Great Britain still considered its colonies and the mother country. The Americans insisted on British recognition of independence, but Howe had no such authority, and Adams and Franklin had little of their own. Although cordial, the meeting broke up without success after just three hours.
During the mission, Adams and Franklin lodged together at crowded inn in a small room with only one window. Adams records an unforgettable and amusing story in his diary about that evening and hearing Franklin’s theory of colds.
The electrical resistance of a circuit is influenced by the _____, _____, and _____ of the wires.
Answer:
Length, gauge/size and composition
Explanation:
The longer the wire is the more resistance
The thinner the wire is more resistance
The difference in material effects the resistance ie. copper versus aluminium.
A birthmark is generally a:
macule.
excoriation.
pustule.
bullae.
Answer:
macule
Explanation:
its aa flat round areausually distingurished from its surroundung skin by its changed in color. smaller than 1cm am small hemorrhage spot.
When Mary talks, she creates an intensity level of 60 dB at your location. Alice talks with the same volume, also giving 60 dB at your location. If both Mary and Alice talk simultaneously from the same spot, what would be the new intensity level that you hear
Answer:
hm
Explanation:
facil
An Olympian lifts a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
The force of gravity equals 9.8 m/s. What is the potential energy of the weights?
Answer:
PE = MGH. 1375 x 9.8 x 2. = 26950 joules
Explanation:
First do 1375 x 9.8 which is MG then times it by 2 which is H
Mass x Gravity x Height
the gravity will always be 9.8
I would love a brainliest
The the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
What is Potential energy?The energy of a body by virtue of its position is called potential energy. Mathematically -
E[P] = mgh
Given is an Olympian who lifted a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
We can write the given data as follows -
Mass of weights = [M] = 1375 Kg
Displacement = [h] = 2 meters
Therefore, using the formula for potential energy, we can write -
E[P] = mgh
E[P] = 1375 x 9.8 x 2
E[P] = 26950 joules
Therefore, the the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
To solve more questions on Mechanical Energy, visit the link below-
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My dog Ubu can run at 21 mi/h. How far can he travel in 40 minutes?
Answer:
14
Explanation:
21miles/3=7
7*2=14
How much power is produced by flashlight that has a voltage of 12 volts and a current of 6.5 x 10^-2 amps? A. 0.78 watts B. 78 watts C. 190 watts D. 0.0054 watts E. 1.9 watts
Answer:
the powar produced is 0.7 watts
Help please !
Which nucleotides form an RNA molecule?
Choose all that apply:
1) Adenine (A)
2) Uracil (U)
3) Thymine (T)
4) Cytosine (C).
Answer:
1) Adenine (A) 2. Uracil (U) 4) Cytosine (C)
Explanation:
"RNA consists of four nitrogenous bases: adenine, cytosine, uracil, and guanine."
The five general principles from the APA are meant to __________. A. be enforceable rules B. be posted in every office C. guide and inspire good conduct D. stand up in court Please select the best answer from the choices provided
The five general principles from the APA are meant to: C. Guide and inspire good conduct.
Beams of light undergo construction interference when two different beams intersect to form one brighter beam of light . Which model of the nature of light dose this behavior?
Answer:the wave model
Explanation:
How much heat Q2Q2 is transferred to the skin by 25.0 gg of steam onto the skin? The heat of vaporization for steam is L=2.256×106J/kgL=2.256×106J/kg.
Answer:
56400Joules
Explanation:
The quantity of heat required is expressed as;
Q = mL
m is the mass = 25g = 0.025kg
L is the latent heat of vaporization for steam = 2.256×10^6J/kg
Substitute into the formula as shown;
Q = 0.025×2.256×10^6
Q = 56400Joules
Hence the quantity of hear required is 56400Joules
The amount of heat transfer from the steam is of 56400 J.
Given data:
The mass of steam is, m = 25.0 g = 0.025 kg.
The latent heat of vaporization of steam is, [tex]L = 2.256 \times 10^{6} \;\rm J/kg[/tex].
When heat is to be given to a unit mass of substance to converts it from a liquid phase to vapor phase. Then it is known as Latent heat of vaporization. The amount of heat is expressed as,
[tex]Q = m \times L[/tex]
Solving as,
[tex]Q = 0.025 \times (2.256 \times 10^{6})\\\\Q = 56400 \;\rm J[/tex]
Thus, we can conclude that the amount of heat transfer from the steam is of 56400 J.
Learn more about the Latent heat of vaporization here:
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Match each disease to the correct pathogen type
Protist:
Virus:
Fungus:
A) AIDS
B) Histoplasmosis
C) Amoebic dysentery
Answer:
Protist: C) Amoebic dysentery
Virus: A) AIDS
Fungus: B) Histoplasmosis
Hope that helps