Answer:
d = 1.07 mile
Explanation:
The rationale for this method is that the speed of light is much greater than the speed of sound, the definition of speed in uniform motion is
v = d / t
d = v t
the speed of sound is worth
v = 343 m / s
Therefore, the speed of sound must be multiplied by time to do this, all the units must be in the same system, as the distance in miles is requested
v = 343 m/s (1mile/1609 m) (3600s/1 h) = 343 (2.24) = 767.4 mile/h
v = 343 m / s (1 mile / 1609 m) = 0.213, mile/ s
If the measured time is t = 5s we multiply it by the speed
we substitute
d = 0.213 5
d = 1.07 mile
If you want to calculate the speed, this method in general is not widely used, since you must know the distance where the lightning occurred, which is relatively complicated.
Light is incident perpendicularly from air onto a liquid film that is on a glass plate. The liquid film is 70.2 nm thick, and the liquid has index of refraction 1.50. The glass has index of refraction 1.40. Calculate the longest visible wavelength (as measured in air) of the light for which there will be totally constructive interference between the rays reflected from the top and bottom surfaces of the film. Assume that the visible spectrum lies between 400 nm and 700 nm.
Answer:
λ₀ = 421.2 10⁻⁹ m
Explanation:
This is an exercise in constructive interference by reflection, let's review some concepts:
* When a ray goes from a medium with a lower index to one with a higher index, it undergoes a phase change of 180º, in this case we have a phase change from the air to the film
* Within the material the wavelength changes according to the spare part index of the material
λₙ = λ₀ / n
By including these two aspects, the constructive interference equation remains
2 n t = (m + ½) λ₀
λ₀ = [tex]\frac{2nt}{m+ \frac{1}{2} }[/tex]
we substitute
λ₀ = 2 1.50 70.2 10⁻⁹ / (m + ½)
let's substitute some values of m
m = 0
λ₀ = [tex]\frac{210.06}{0.5}[/tex] 10⁻⁹
λ₀ = 421.2 10⁻⁹ m
is in the visible range
m = 1
λ₀ = [tex]\frac{210.6}{1+0.5}[/tex] 10⁻⁹
λ₀ = 140.4 10⁻⁹ m
This outside visible range, is ultraviolet light
Which food provide the best nutrients
Answer: Foods that naturally are nutrient-rich include fruits and vegetables. Lean meats, fish, whole grains, dairy, legumes, nuts, and seeds also are high in nutrients.
EMERGENCY
Parallax
Find the distance to the following stars:
.768”
.09”
.63”
.25”
.125”
Rita is a salon owner. She notices that her salon charged one of her clients, Linda, extra for a service that the clent did not request. What do you think Rita should do? Α. Remaln qulet about the extra money. B. Distribute the money equally among the staff. C. Call the client and Inform her that she was incorrectly charged. D. Try overcharging the next client too and check if it goes unnoticed.
Answer:
C hope it helps
call the client and inform her that she was incorrectly charged.
Answer:
The answer is C. call the client and inform her that she was incorrectky charged
Explanation:
Explain why is the temperature of a hot tea higher than the temperature of iced tea?
Answer:
Because the hot tea is hot from a microwave or coffee machine when iced tea is cold from ice in the tea.
Explanation:
use atoms and molecules in a sentence
Answer:
An atom is the smallest part of an element by itself, while molecules are built of multiple atoms.
'If you increase the frequency of a sound wave four times, what will happen to its speed?
ОА.
The speed will increase four times.
OB.
The speed will decrease four times.
O c.
The speed will remain the same.
OD
The speed will increase twice.
O E.
The speed will decrease twice.
A 13 500 N car traveling at 50.0 km/h rounds a curve of radius 2.00 × 102 m. Find the following: a. the centripetal acceleration of the car b. the centripetal force c. the minimum coefficient of static friction between the tires and the road that will allow the car to round the curve safely
Answer:
a. 0.947 m/s^2
b. 1304.54 N
c. 0.0966
Explanation:
mass of car = 13500 N = 13500/9.8 = 1377.55 kg
velocity = 50 km/h = 50,000 m/h = 13.9 m/s
raidus = 204 m
a. centripetal acceleartion = v^2/r = 13.9^2/204 = 0.947 m/s^2
b. centripetal force = m*centripetal acceleration = 1377.55 * 0.947 = 1304.54 N
c. In order for the car to round the curve safely, static friction = centripetal force
static friction = coefficient of friction (mu) * mg = mu* 1377.55*9.8 = 13500mu
13500mu = 1304.54
mu = 1304.54/13500 = 0.0966
The acceleration, force and coefficient of friction is required.
Centripetal acceleration is [tex]0.965\ \text{m/s}^2[/tex]
Centripetal force is [tex]1328\ \text{N}[/tex]
Coefficient of friction is [tex]0.1[/tex]
N = Weight of car = 13500 N
v = Velocity = [tex]50=\dfrac{50}{3.6}=13.89\ \text{m/s}[/tex]
r = Radius = [tex]2\times 10^2\ \text{m}[/tex]
m = Mass of car = [tex]\dfrac{N}{g}[/tex]
g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
Centripetal acceleration is
[tex]a_c=\dfrac{v^2}{r}\\\Rightarrow a_c=\dfrac{13.89^2}{2\times 10^2}\\\Rightarrow a_c=0.965\ \text{m/s}^2[/tex]
Force is given by
[tex]F_c=ma_c\\\Rightarrow F_c=\dfrac{N}{g}a_c\\\Rightarrow F_c=\dfrac{13500}{9.81}\times 0.965\\\Rightarrow F_c=1328\ \text{N}[/tex]
Coefficient of friction is given by
[tex]\mu=\dfrac{F_c}{N}\\\Rightarrow \mu=\dfrac{1328}{13500}\\\Rightarrow \mu=0.098\approx 0.1[/tex]
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The device shown below contains 2 kg of water. When the cylinder is allowed to fall 250 m, the temperature of the water increases by 1.4°C. Suppose 2 kg of water are added to the container and the cylinder is allowed to fall 750 m. What would the increase in temperature be in this case? Gizmo image A. 0.7°C B. 1.4°C C. 2.1°C D. 2.8°C
Answer:c. 2.1°C
Explanation:
I just did it
If the harmonic is 66 Hz, find the fundamental frequency
The ancient Egyptians build their pyramids using a ramp to move the heavy blocks up. The length of the ramp was 25m and the height was 10m the weight of the block was 250kg and the effort weight is 180kg. What is the efficiency of the inclined plane
Answer:
Efficiency of the inclined plane is 56%
Explanation:
efficiency = (work output / work input) x 100%
efficiency = ([load force x load distance] x [effort force x effort distance]) x 100%
efficiency = (250 kg x 10 m) / (180 kg x 25 m) x 100%
efficiency = (2500kg/m) / (4500kg/m) x 100%
efficiency = 0.555 = 0.56 x 100%
efficiency = 56%
What happens when an object is moved against gravity, such as rolling a toy car up a
ramp?
a. Potential energy does not change
b. Potential energy decreases as it is transformed into kinetic energy
c. Kinetic energy does not change
d. Kinetic energy is transformed into potential energy
Answer:
gravitational force remain constant
we have that from the Question, it can be said that
What happens when an object is moved against gravity, such as rolling a toy car up is
Kinetic energy is transformed into potential energyOpion DFrom the Question we are told
What happens when an object is moved against gravity, such as rolling a toy car up
a. Potential energy does not change
b. Potential energy decreases as it is transformed into kinetic energy
c. Kinetic energy does not change
d. Kinetic energy is transformed into potential energy
Generally the equation for Kinetic energy is mathematically given as
K.E=1/2mv^2
Generally the equation for Potential energy is mathematically given as
P.E=mgh
Therefore
With increase in height of the car Kinetic energy is transformed into potential energy as g remains constant
Hence
What happens when an object is moved against gravity, such as rolling a toy car up is
Kinetic energy is transformed into potential energyOpion DFor more information on this visit
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In your own words, tell me how an element, molecule, and compound are used to make different substances. All three must be mentioned in order to receive full credit.
Answer:
When atoms from different elements are joined together in groups, they form molecules. The atoms in molecules bind together chemically, which means that the atoms cannot be separated again by physical means, such as filtration. The molecule has different properties from the elements from which is was made.
Explanation:
1. meaning of heat and temperature
2. differences between heat and temperature
Answer:
1.heat is a form of 1.temperature is a form
energy that gives of energy that is used to
sensation of measure hotness or
warmth. or coldness of body.
2.its si unit is 2.its si unit is kelvin.
joule.
A wave has a wavelength of 2 meters and a frequency of 1.5 hz. What is its speed
Answer:
3m/s is the answer.
Explanation:
f = c/λ
f = frequency
c = speed (m/s)
λ = wavelength
f = c/λ
1.5 = c/2
c = 3m/s
What does a charged object experience as it is placed into an electric field?
Answer:
In an electric field a charged particle, or charged object, experiences a force. If the forces acting on any object are unbalanced, it will cause the object to accelerate. With this in mind: If two objects with the same charge are brought towards each other the force produced will be repulsive, it will push them apart.
Explanation:
Explain why, in terms of forces, there is a risk of head injury when diving from this height. Suggest why the high divers would choose to enter the water feet first.
Answer:
Due to lower risk of injury or damage.
Explanation:
The high divers would choose to enter the water from the feet first because there is low risk of injury. The brain is the most important part of the body which very sensitive to any small injury. Small injury to brain leads to big problems in life. High divers can reach speeds of nearly 60 mph and enters about 28m into the water in about three seconds which can damage the head region if comes in contact with the ground so this is the reason the high divers avoid of entering in the water through their heads and choose entering through their feet.
differences between mass and weight
Explanation:
Mass : -
1. It is the amount of mass present in an object.
2. SI unit : Kilograms ( kg )
3. Relation between Mass and Weight is W = mg.
Weight : -
1. It is the force with which it is attracted towards the centre of the earth.
2. SI unit : Newton ( N )
3. Relation between Mass and Weight is W = mg.
Mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on the object.
An object's inertia is its tendency to maintain contact:
1.) Mass.
2.) Position.
3.) Acceleration.
4.) Velocity.
hello! it is velocity.
i say this because, Inertia is the tendency of an object to resist changes in its state of motion. ... The state of motion of an object is defined by its velocity - the speed with a direction.
Which is denser?
The water in a swimming pool or a quarter (coin).
Answer:
The coin is denser than any of the liquids, and will sink through everything. The oil is the least dense liquid, so it will float on the water, and the syrup is the densest liquid, so it will sink below the water.
Explanation:
cute copy and paste? ☏ ♡ ☆⋆◦★◦⋆°*•°
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° :. ° . ☆ . . • . ● .° °★ Not sure how to copy and paste? Just right click your mouse and choose copy in options, to release repeat the process and just paste it. No mouse? Select the text with your computer pad and use ctrl c to release, ctrl v. On mobile? Press on your screen and select the text, use the option copy and paste wherever you would like!
You can use the information below to calculate it :)
Density of water: 1000 kg/m3.
Density of the coin: copper 8.96 g/cm^3
nickel 8.90 g/cm^3
1 kg = 1000 g
All you have to do now is convert it and thats it
A heavy piano is pushed up an inclined plane into a moving van. Which of the following choices best explains how the inclined plane made the task easier?
1. The force needed to move the piano up the plane was less than the force needed to lift it straight up into the van, but the distance over which the piano moved was greater.
2.The force exerted on the piano was the same as if it had been lifted, but the distance it needed to be move decreased, so the total work decreased.
3.The distance that the piano was moved was less that the distance it would have had to be lifted, so the total work decreased.
4. The amount of force need to push the piano up the ramp is the same as the force needed to lift it, so the amount of work remained the same.
The term mechanical advantage has to do with the ratio of the load to the effort.
What is mechanical advantage?
The term mechanical advantage has to do with the ratio of the load to the effort. There is a mechanical advantage when the effort applied is less than the load.
Hence, the task is made easier because the force needed to move the piano up the plane was less than the force needed to lift it straight up into the van, but the distance over which the piano moved was greater.
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Which of these energy transformations is not part of how a nuclear power plant
provides electrical energy to a home?
changing electrical energy to chemical energy
changing thermal energy to mechanical energy
changing nuclear energy to thermal energy
changing mechanical energy to electrical energy
What’s an insulator?
A.Material does not conduct electrical current
B.Material that conducts electrical current
C.Other
Answer: a substance which does not readily allow the passage of heat or sound. so I think A or C but I pick A
Explanation:
am i right? please help!
How would you classify an EM wave with a frequency of 10^7 Hz?
Answer:
I think it is television and radio wave
When it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere. Which statement best explains the reason for this situation?
Group of answer choices
A) When the Northern Hemisphere is closer to the sun than the Southern Hemisphere is, the Southern Hemisphere is relatively far from the sun.
B) When the Northern Hemisphere is tilted toward the sun, the Southern Hemisphere is tilted away from the sun.
C) When the Northern Hemisphere is farther from the sun than then Southern Hemisphere is, the Southern Hemisphere is relatively close to the sun.
D) When the Northern Hemisphere is tilted away from the sun, the Southern Hemisphere is tilted toward the sun.
Explanation::i dont know the answer ,but pls then also mark me as brainlist
Answer:
When the N. Hemisphere is tilted away from the sun, the S. Hemisphere is tilted toward the sun
Explanation:
Unlike the idiot down there that just wanted point here you go
Light travels at a speed of 3.0 ´ 108 m/s. If it takes light from the sun 5.0 ´ 102 s to reach Earth, what is the distance between Earth and the sun?
Answer:
The distance between the Earth and the Sun is:
1.5 multiplied by 10 raised to the power 8 km
Explanation:
(5.0 x 10²) x (3.0 x 10⁸) = 1.5 x 10¹¹ meters = 1.5 x 10⁸ km.
Sample of gas occupies 725 mL at 23°C 920 MMHG find the volume of the gas at standard temperature and pressure
Answer:
V2=809.44 mL
Explanation:
If ans is correct give a comment or ask for explanation with me .
Which of the following results when most or all of the neutrons released in a
fission reaction encounter other nuclei?
find the torque when the work done to more through an angel of 1/4π radians is 3j
Answer:
The torque is approximately 3.82 N·m
Explanation:
The relationship between work done, 'W', and the applied torque, 'τ' can be presented as follows;
W = τ × Δθ
Where;
W = The work done by the torque
τ = The magnitude of the torque
Δθ = The angle through which the object is turned
The parameters for 'W' and 'Δθ' are;
W = 3j
Δθ = 1/4 × π
From W = τ × Δθ, we have;
τ = W/Δθ
∴ τ = 3j/(1/4 × π) ≈ 3.81971863421 N·m
The torque, τ ≈ 3.82 N·m