Answer:
equator
Explanation:
in south & north pole you could have 20+ hours daylight or night, everyday!
the refraction index of the first water solutionis equal to 1.3. The second water solution of the same substance has the refraction index of 1.43. How many times does the concentration of the second solution higher than the first one? The refraction index for water is equal to 1.33.
The refraction index of the first water solution is equal to 1.3. The second water solution of the same substance has the refraction index of 1.43.
The concentration of a solution is not directly related to its refractive index, so we cannot use the given values of refractive indices to calculate the concentration of the two solutions. However, we can use the refractive indices to compare the densities of the two solutions.
When light passes from a medium with a lower refractive index to one with a higher refractive index, it bends towards the normal. Conversely, when light passes from a medium with a higher refractive index to one with a lower refractive index, it bends away from the normal. The amount of bending depends on the refractive indices of the two media and the angle of incidence.
In this problem, we can assume that the light ray is traveling through air, which has a refractive index close to 1. We can use Snell's law to find the angle of refraction at the first interface
sin(θ1) = (n1/n2) * sin(θ2)
Where θ1 is the angle of incidence, θ2 is the angle of refraction, n1 is the refractive index of air (close to 1), and n2 is the refractive index of the first water solution (given as 1.3).
Assuming that the angle of incidence is small, we can use the small angle approximation sin(θ) ≈ θ, and rearrange the equation to get
θ2 ≈ (n1/n2) * θ1
θ2 ≈ (1/1.3) * θ1
θ2 ≈ 0.769 * θ1
At the second interface, the light ray is passing from the first water solution (refractive index of 1.3) to the second water solution (refractive index of 1.43). Using Snell's law again, we get
sin(θ2) = (n2/n3) * sin(θ3)
Where θ3 is the angle of refraction in the second water solution, and n3 is the refractive index of the second water solution (given as 1.43).
Assuming small angles again, we can use sin(θ) ≈ θ and rearrange the equation to get
θ3 ≈ (n2/n3) * θ2
θ3 ≈ (1.3/1.43) * 0.769 * θ1
θ3 ≈ 0.707 * θ1
The indicated angle is the angle of deviation between the incident and emergent rays, which is the sum of the two refraction angles
θ_indicated = θ1 + θ3
θ_indicated ≈ θ1 + 0.707 * θ1
θ_indicated ≈ 1.707 * θ1
We don't know the value of θ1, but we can still make a comparison between the two solutions. Since the angle of deviation depends on the density of the medium, we can say that the second water solution is denser than the first one, because it has a higher refractive index. The amount of the difference in density can be calculated by taking the ratio of the squares of the refractive indices
[tex](n2/n1)^{2}[/tex] = [tex](1.43/1.3)^{2}[/tex] ≈ 1.172
This means that the second solution is about 1.172 times denser than the first one.
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'State the appropriate serving size for a 3 to
5-year-old child for each of the following foods:
a. milk
b. dry cereal
c. fruit
d. vegetable
e. bread
2. Where can a program director locate information about state licensing requirements that address nutrition and food services for young children?
3. Name four sensory qualities that contribute to food's appeal.
4. What are two advantages of using fresh fruits and vegetables in season?
5. List two strategies the menu planner can use to control food costs.
Based on my own known, the right serving size for a 3 to 5-year-old child are:
a. milk - A single cup
b. dry cereal - 1/2 cup
c. fruit - 1/2 cup
d. vegetable - 2 leafty
e. bread - 1 slice of bread.
What is the serving size?A program director can find state licensing requirements for nutrition and food services for young children on their state's education or health department website.
The four sensations that contribute to food appeal are appearance, aroma, taste, and texture. Using fresh seasonal produce is cheaper and more flavorful. To control food costs, menu planners can use less expensive ingredients and reduce waste.
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If a 641.6 grams mass on a spring has a period of 0.52 seconds, what is the spring constant of the spring?
A student eats a dinner rated as 2000 calories. He wishes to do an equivalent amount of work in the gymnasium by lifting a 50 kg mass. How many times must he raise the weight to expend this much energy? Assume he raised the weight a distance 2 m each time and that no work is done when the weight is dropped to the floor. 1 food calorie = 10 ^ 3 * cal 1cal = 4.186
Answer:
By using work energy theorem
Intake energy = work out
Intake energy = (number of lifting barbell) x (work done per lifting)
Ei = n x W
Ei = nW
Now
Work per lifting = Force x displacement
W = (mg) x (displacement)
W = (50 x 9.8) x (2)
W = 980 J
Now
Ei = n x W (Ei = 2000 Cal = 2 kilocalory = 8368 Joule)
8368 = n x 980
n = 8.53
Aprrox 8 times he should raise barbell to expend 2000 calory.
Explanation:
A group of students have decided to build an electric motor. Their motor looks similar to the one in this diagram: They would like their motor to spin faster. Name two ways to
improve the design of their motor. Explain how each of these will cause the motor to spin
faster.
Increasing the voltage delivered to an electric motor is one approach to get it to spin more quickly.
How can the electric motor spin faster?
Increasing the voltage will result in a greater magnetic field being produced by the motor, which will then result in a stronger torque being applied to the rotor. The rotor will spin more quickly as a result because the motor's speed and torque are inversely related.
It is crucial to remember that raising the voltage above the motor's recommended voltage can cause overheating and motor damage.
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2. Hallar las dimensiones de K, sabiendo que F: fuerza, V: velocidad, y que la siguiente fórmula es dimensionalmente correcta: K = F.V + Q Donde: F: Fuerza = [MLT-2] V : Velocidad = [L.T-1]
The dimensions of K are [tex][ML^2T^{-3}].[/tex]
The dimensions of K can be found by analyzing the dimensions of each term in the formula K = F.V + Q.
The dimension of the first term of the F.V is given by:
[tex][MLT^{-2}] * [LT^{-1}] = [ML^2T^{-3}][/tex]
The dimension of the second term Q is unknown, but we know it must be the same as the dimension of K to ensure that the formula is dimensionally correct. Therefore, we can write:
K = [tex][ML^2T^{-3}] + [Q][/tex]
Since K has the dimension of energy, which is [tex][ML^2T^{-2}][/tex], we can equate the dimensions of K and simplify:
[tex][ML^2T^{-2}] = [ML^2T^{-3}] + [Q][/tex]
[Q] =[tex][ML^2T^{-2}] - [ML^2T^{-3}][/tex]
[Q] = [tex][ML^2T^{-3}][/tex]
Therefore, the dimensions of K are [tex][ML^2T^{-3}].[/tex] as calculated above.
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--The complete question is,
Find the dimensions of K, knowing that F represents force, V represents velocity, and that the following formula is dimensionally correct: K = F.V + Q, where: F represents force and has dimensions of [M L T^-2], V represents velocity and has dimensions of [L T^-1].--
can someone help me pleas u need to turn it in today
According to the George Washington Carver quotation, most mistakes are the result of those who prefer to find reasons not to take responsibility for their acts.
To put it another way, people who find reasons to blame others instead of accepting responsibility for their own failings and making changes tend to deflect blame from themselves. The remark implies that taking personal responsibility and being accountable for one's actions are essential for success, even when there may be instances where external forces do contribute to failures. Overall, although this remark may be viewed as a generalization, it does emphasize the need of accepting responsibility for one's actions and attempting to solve challenges rather than finding reasons to blame others.
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A 1.0-cm tall object is 10 cm in front of a converging lens that has a 30 cm focal length.
Calculate the image position and image height using the thin lens and magnification equations.
The image distance is -15 cm.
Height of the object, h = 1 cm
Object distance, v = 10 cm
focal length, f = 30 cm
According to thin lens equation,
1/f = 1/u + 1/v
So, 1/u = 1/f - 1/v
1/u = (1/30) - (1/10)
Therefore, the image distance,
u = 30 x 10/(10 - 30)
u = -15 cm
The magnification of converging lens,
M = -u/v = h'/h
Therefore, the height of the image,
h' = h(-u/v)
h' = 1 x -(-15/10)
h' = 1.5 cm
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Based on the picture, which of the following statements is true?
A
Layer E was deposited after the intrusion of C
B
Intrusion C occurred before the movement on H
C
Layer D was deposited after the movement on H
D
Layer F was deposited before the intrusion of C
Answer:
A
Layer E was deposited after the intrusion of C B
Ocean tides are caused by the ______________ pull of the _______ and the _______. The moon
has the __________ effect on the tides. When the Sun, moon and earth are in a straight line, we
have __________ tides. When the Sun, moon and earth are at right angles we have _________
tides. Spring tides are especially _________ tides while neap tides are especially _________
tides.
Ocean tides are caused by the gravitational pull of the Moon and the Sun. The moon has the strongest effect on the tides. When the Sun, Moon, and Earth are in a straight line, we have spring tides. When the Sun, Moon, and Earth are at right angles, we have neap tides. Spring tides are especially high tides while neap tides are especially low tides.
Ocean tides are caused by the gravitational pull of the moon and the sun on the Earth's oceans. The moon has a greater effect on tides than the sun because it is closer to the Earth.
When the Sun, moon, and Earth are in a straight line, we have higher high tides and lower low tides, which are called spring tides.
When the Sun, moon, and Earth are at right angles, we have less extreme tides, which are called neap tides.
Spring tides occur during a full moon and a new moon, while neap tides occur during a first quarter and a third quarter moon. Spring tides are especially strong tides because the gravitational pull of the moon and the sun are working together to pull the oceans in the same direction. Neap tides are weaker tides because the gravitational pull of the moon and the sun are working against each other, which leads to a lesser tidal range.
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explain magnetic flux
The components of vectors and are given as follows:
Ax = 7.6Bx = -5.1
Ay = -9.2By = -6.8
What is the magnitude of the vector difference - ?
The magnitude of the vector difference is approximately 12.98.
To find the magnitude of the vector difference, we need to subtract the components of vector B from the components of vector A and then find the magnitude of the resulting vector.
The components of the vector difference, C = A - B, are given by:
Cx = Ax - Bx = 7.6 - (-5.1) = 12.7
Cy = Ay - By = -9.2 - (-6.8) = -2.4
The magnitude of vector C is given by:
|C| = √(C² + Cy²)
Substituting the values of Cx and Cy, we get:
|C| = √(12.7² + (-2.4)²) = √(162.25 + 5.76) = √168.01
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The frequency of microwaves in a microwave oven is 2450 MHz . What is the mode number for electromagnetic standing waves in a 42.9- cm -wide microwave oven?
The mode number for the electromagnetic standing waves in a 42.9-cm-wide microwave oven with a frequency of 2450 MHz is 7.
The mode number of standing waves in a microwave oven can be found using formula:
n = 2L/λ
λ = c/f
where c is the speed of light in vacuum and f is frequency of the microwaves.
We are given frequency of microwaves as 2450 MHz. Converting this to SI units, we get:
[tex]f = 2.45 * 10^9 Hz[/tex]
The speed of light in vacuum is approximately [tex]3.00 *10^8 m/s[/tex].
Now we can calculate wavelength:
[tex]\lambda = c/f \\\lambda = (3.00 * 10^8 m/s) / (2.45 * 10^9 Hz) \\\lambda = 0.1225 m[/tex]
We are also given the width of the microwave oven as 42.9 cm, which we convert to meters:
L = 0.429 m
Now we can calculate the mode number:
[tex]n = 2L/\lambda \\n = 2(0.429 m) / 0.1225 m \\n = 7[/tex]
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A nonconducting rod with a uniformly distributed charge
+Q. The rod forms a half-circle with radius R and produces an
electric field of magnitude Earc at its center of curvature P. If
the arc is collapsed to a point at distance R from P (Fig. b),
what is the magnitude of the electric field at P?
Answer:
It will be same as the length of arc
Explanation:
See we can see that the magnitude of force is equal to the magnitude of the arc so it is equal
A tank filled with water is moving down an inclined
surface with an angle of 15 degree. If
the tank decelerates (slows down) at a= 3.83 m/s2
determine the angle of the free surface relative to the
horizontal direction after deceleration.
The angle of the free surface relative to the horizontal direction after deceleration is approximately 20.2 degrees.
Let's assume that the tank has a mass of m, the angle of the inclined surface is θ, and the height of the inclined surface is h. The initial kinetic energy of the tank is given by:
KE = (1/2)mv²
where v is the initial velocity of the tank. When the tank reaches the top of the inclined surface, its potential energy is given by:
PE = mgh
where g is the acceleration due to gravity (9.81 m/s²). Since there is no change in the total energy of the system (tank + water), we can equate the initial kinetic energy to the final potential energy:
(1/2)mv² = mgh
Solving for v, we get:
v = √(2gh)
When the tank decelerates with an acceleration of a, its velocity decreases at a rate of a m/s². The time taken for the tank to come to a complete stop is given by:
t = v/a
The distance traveled by the tank during this time is:
s = (1/2)at²
[tex]=\dfrac{1}{2} (\dfrac{v}{a})^2a = \dfrac{v^2}{2a}[/tex]
The angle of the free surface relative to the horizontal direction after deceleration is given by:
[tex]\theta' = tan^{-1}\dfrac{s}{h}[/tex]
Substituting the values of v and s, we get:
[tex]\theta' = tan^{-1}\dfrac{\sqrt{2gh}^2}{2ah}\\\\ = tan^{-1}\dfrac{2h}{3a}[/tex]
Substituting the given values of h and a, we get:
[tex]\theta' = tan^{-1}\dfrac{2(9.81)sin(15)}{3.83}\\ = 20.2[/tex]
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Section 14.1 Assessment
Reviewing Concepts
1. What conditions must exist in order for a
force to do work on an object?
2.
What formula relates work and power?
3. How much work is done when a vertical force
acts on an object moving horizontally?
Critical Thinking
4. Applying Concepts A desk exerts an
upward force to support a computer resting
on it. Does this force do work? Explain.
6. Comparing and Contrasting You carry
two heavy bags of groceries upstairs to your
kitchen. Will you do more work on the bags if
you carry them up one at a time? Explain.
Math Practice
7. How much work does a 25-newton
force do to lift a potted plant from the
floor to a shelf 1.5 meters high?
8. You lift a large bag of flour from the
floor to a 1-meter-high counter, doing
100 joules of work in 2 seconds. How
much power do you use to lift the bag
of flour?
5. Predicting Two cars have the same weight,
but one of the cars has an engine that provides
twice the power of the other. Which car can
make it to the top of a mountain pass first?
Which car does more work to reach the pass?
swer assessment questions 1-8 on page 416 (above) in the following space.
The engine that provides twice more power will make it first
The car with the twice more power does more work
What is the formula?When a vertical force acts on an object moving horizontally, the work done by the force depends on the angle between the force and the displacement of the object. If the force is perpendicular to the displacement, no work is done, since the force does not contribute to the displacement of the object.
The work done is the same as the gravitational potential energy and this is;
W = F h
F = Force
h = height of the object
Thus;
W = 25 * 1.5
= 37.5 J
Then;
Power = Work done/Time
= 100 J/ 2 s
= 50 W
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Which is TRUE of the number of doctors per 10,000 people in the United States?
OA. The United States has more doctors than any other nation.
OB.
It is significantly better in urban areas than rural.
O C.
It is very low compared to the numbers in the developing world.
O D.
It is not an accurate measure of the quality of health care in the United States.
What is true about the number of doctors is D. It is not an accurate measure of the quality of health care in the United States.
What should you know about the numbers of doctors in the United states?The number of doctors per 10,000 people simply tells us the phyiscian proportion in the united states.
But does it suggest that the quality of healthcare in America is way better than many other places? No.
There are Many other factors, Like as access to healthcare facilities, healthcare infrastructure, affordability, and the overall health of the population, contribute to the quality of healthcare in a country.
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