what is meant by focal length of a lens or a mirror
Answers
The focal length is a key characteristic of lenses and mirrors, representing the distance from the optical center to the focal point. It plays a significant role in determining image size, magnification, and field of view in various optical systems.
Focal length is a fundamental concept in optics that applies to both lenses and mirrors. It refers to the distance between the optical center of the lens or mirror and the focal point, where parallel rays of light converge or appear to diverge after passing through the lens or reflecting off the mirror. In other words, the focal length is the point at which an object in focus forms a clear, sharp image.
In lenses, the focal length is determined by the curvature and refractive index of the lens material. A lens with a short focal length will bend light more sharply, resulting in a larger image but a smaller field of view. Conversely, a lens with a long focal length will bend light less, producing a smaller image with a larger field of view. This property is important in various applications, such as cameras, telescopes, and eyeglasses.
In mirrors, the focal length is related to the curvature of the mirror's surface. For a concave mirror, the focal point is where light rays that are parallel to the mirror's axis converge after reflection. In contrast, for a convex mirror, the focal point is where the reflected rays appear to diverge from. The focal length of a mirror influences its magnification and image formation properties, making it crucial in devices like telescopes, microscopes, and car rearview mirrors.
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Related Questions
A girl kicks a blue ball with a velocity of 20.0 m/s at 65.0o. How long is it in the air?
1.85s
1.92s
13.6s
3.69s
Answers
Explanation:
t = usin©/g
Where t is the time to reach the maximum height
Time spent in air is T = 2t
Hence, T = 2usin©/g
T = 2 x 20 x sin 65°/ 9.8
T = 3.69s
What is the function of the uterus during embryo development?
Answers
Answer:
The uterus plays a significant part in the pregnancy, menstruation, zygote implantation, conception, labor, and delivery of the baby along with other essential reproductive system organs.
Explanation:
The uterus is a female reproductive organ that is pare shaped and situated between the urinary bladder and the rectum ins the pelvis. The placenta develops links with the uterine blood vessels that provide the embryo with nutrition through an umbilical cord. When this happens, the uterus delivers signals to the brain to adjust the secretion of the hormone such that releases of more eggs (i.e. ovulation) are halted and the menstrual cycle momentarily stops, thereby verifying the pregnancy. In pregnancy the uterus provides the space and an adequate atmosphere for the fetus to develop safely, it provides feedback to the brain which regulates hormones release. The uterus forms a link between the mother and the baby through the placenta and umbilical cord not only to provide the requisite nutrients and oxygen but also to extract the waste products and purify the blood of the fetus before the fetal organs take over.
A dog chases a skateboarder travelling at 10.4\,\dfrac{\text{m}}{\text{s}}10.4 sm 10, point, 4, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. The skateboarder speeds up with a constant acceleration for 39\,\text{m}39m39, start text, m, end text over 3.3\,\text{s}3.3s3, point, 3, start text, s, end text. We want to find the acceleration of the skateboarder over the 3.3\,\text{s}3.3s3, point, 3, start text, s, end text time interval
Answers
Answer:Δx=v0t + 1/2 at 2
As you drive, a passenger in your car records your speed at 10-second intervals. The passenger records the following data: {(0 s, 18 m/s), (10.0 s, 18 m/s), (20.0 s, 18 m/s),
(30.0 s, 18 m/s), (40.0 s, 18 m/s)}. Using a graph of the velocity as a function of time, determine your displacement between t = 10.0 s and t = 35.0 s.
Answers
The velocity as a function of time is 0, and displacement between t = 10.0 s and t = 35.0 s is 0.
How to find velocity and displacement?The vector quantity velocity (v), denoted by the equation v = s/t, quantifies displacement (or change in position, s), over change in time (t).
as S= 0, then
\(V_{total}\) = \(\frac{ Final Speed - initial speed}{total_time }\)
V=0.
Displacement is defined as the final position minus the starting position.
Displacement = Final distance- initial distance
S= 0
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what is the SI unit of wavelength of a wave?
Answers
The SI unit of wavelength of a wave is meters (m).
how does heat loss to the surrounding affect the results? calorimetry
Answers
In calorimetry, heat loss to the surrounding can significantly affect the accuracy of the results.
When conducting a calorimetry experiment, the goal is to measure the heat released or absorbed during a chemical reaction or physical change. However, when the reaction takes place inside a calorimeter, heat may be lost to the surrounding environment, which can alter the calculated heat of the reaction.
The amount of heat lost to the surroundings depends on various factors such as the design of the calorimeter, the insulation, the duration of the experiment, and the temperature difference between the system and the surroundings. If the calorimeter is not well insulated, heat will transfer from the system to the surroundings, causing the measured heat of the reaction to be lower than the actual value.
To reduce the effect of heat loss to the surroundings, it is essential to use a well-insulated calorimeter that minimizes heat transfer. Additionally, the temperature of the surroundings should be kept constant to prevent any temperature changes that may affect the heat flow.
In summary, heat loss to the surroundings can significantly affect the accuracy of calorimetry results. Therefore, it is crucial to use a well-insulated calorimeter and maintain constant temperature conditions to minimize heat transfer and obtain reliable data.
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Packing material such as packing peanuts or bubble wrap are used to reduce theforce on items when a box is dropped during shipping. Which is the best explanationfor why the force is reduced?The packing material makes the object fall slower and impact the ground withless force..The packing material allows the contents of a box to move more freely.The packing material cushions the contents and increases the time of impactwhen the box strikes the ground.The packing material increases the mass of the box reducing the impact whenthe box strikes the ground.
Answers
The correct choice is the third option.
This comes from the fact that the packing material cushions the impacts of the content in case of a fall.
A farmer is pushing a 75 kg plow across a field with 700 N at an angle of 35 degrees above the ground. If the kinetic frictional force between the plow and the field is 250 N. What is the Normal Force from the ground onto the plow? And what is the acceleration of the plow?
Answers
Given :
A farmer is pushing a 75 kg plow across a field with 700 N at an angle of 35 degrees above the ground.
The kinetic frictional force between the plow and the field is 250 N.
To Find :
The Normal Force from the ground onto the plow.
The acceleration of the plow.
Solution :
Normal force = mg + F sin Ф
= 75×10 + 700 × sin 35°
= 1151.50 N
Now,
ma = 700 cos Ф - 250
75×a = 323.4
a = 4.31 m/s²
Hence, this is the required solution.
What type of device forms images through refraction?
Answers
Answer:
A lens
Explanation:
A lens forms images when light passes Through it bending the rays of in the process.A phenomena called refraction and the speed of light changes in the process because it enters a medium since it's wavelength is reduced.
If y = ab, then find the maximum percentage error in the measurement of y.
Answers
Answer:
(Δa/a +Δb/b) × 100
Explanation:
Y= a/b
So, maximum percentage error
Δy/y = ( Δa/a + Δ b/b) × 100
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Q3. Given the following table find the value of y when x=3 by interpolation using Newton's Divided Difference Q4. Using Lagrange's Interpolation method, determine the value of y if x is 13 from the following data
Answers
Q3. By using Newton's Divided Difference interpolation, the value of y when x=3 can be determined.
Q4. Using Lagrange's Interpolation method, the value of y can be determined for x=13 from the given data.
Interpolation methods are used to estimate the value of a dependent variable (in this case, y) when the independent variable (x) falls between two known data points. Newton's Divided Difference interpolation and Lagrange's Interpolation method are two commonly used techniques for this purpose.
To find the value of y when x=3 using Newton's Divided Difference interpolation, we can use the given table of data points and interpolate a polynomial function that fits the data. The coefficients of this polynomial can be determined using the divided difference formula. By substituting x=3 into the interpolated polynomial, we can calculate the corresponding value of y.
using Lagrange's Interpolation method, we can also determine the value of y for x=13. This method involves constructing a polynomial function that passes through the given data points. By using the Lagrange interpolation formula, which is based on weighted averages, we can calculate the value of y for the desired x=13.
Interpolation methods are valuable tools in data analysis, curve fitting, and prediction. They allow us to estimate values within a range based on known data points. By utilizing these techniques, we can make informed predictions and fill in missing information between data points.
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A 1,200 kg car accelerates at 3 m/s2. What net force is the car experiencing during thisacceleration?0 3600 NO 2000 N0 2400 NOON
Answers
m = mass = 1,200 kg
A = acceleration = 3 m/s^2
Apply Newton's second law:
Force = mass x acceleration
F = 1,200 x 3 =3600 N
The net force the car experiences is 3600 N
As you grow and learn, your neurons continue to connect, making you better at the
things you do.
False
True
Answers
True. When you learn something new neurons make connections and retain that knowledge. That means the more you learn a skill the more connections you make and the more muscle memory you get from doing that skill. Thus you get better at that skill.
Answer:
true
Explanation:
Ball A is negatively charged and ball B is electrically neutral. What happens to the charges of both balls when they come into contact with each other if:
(a) they are made of an electrical conductor
describe what will happen
(b) they are made of insulator
describe what will happen
Answers
Answer:
ans for A)
Ball A being negatively charged and Ball B being neutral
when they come into contact.... electrons from the ball A will transfer to ball B and since they are covered by an electrical conductor... their contact will form a joint pathway for electric charge to be transferred to another object.
Answer: i think A
Explanation:
A Student walks 2 km in 30 minutes
Answers
Answer:
1 km / 15min
Explanation:
The average speed is calculated by simply doing space divided by time so:
2km / 30min that becomes 1km / 15min
Have a good day.
A 1kg rock is dropped 50m off a bridge. How much PE did it have
before it was dropped?
Answers
In this case, a body of mass 5 kg kept at a height of 10 m. So, the potential energy is given as 500 J.
Which energy has potential?An object's potential energy is its stored energy. This energy has the capacity to be productive. An object's potential energy is provided by gravity. Gravity's downward force is the source of this potential energy.
The acceleration brought on by gravity is known as the gravitational constant, or g. On Earth, this acceleration is equivalent to 10 metres per second. PE = mgh is the equation for potential energy resulting from gravity. The object's potential energy declines and its kinetic energy rises as it approaches the ground.
Briefing:Potential Energy = 5 x 10 x 10 = 500J.
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An equilateral triangle is a triangle with all three sides of equal length. All of the angles in an equilateral triangle are equal.
What is the measure of angle θ in the triangle shown?(Figure 1) Recall that the sum of the angles in a triangle equals 180∘.
Answers
Answer:
60
Explanation:
it's equilateral...all angles are equal...180÷3=60ffs
Each angle of triangle is 60 degree.
What is equilateral triangle ?
If a Triangle having all the three sides of equal length and corresponding angle also to be equal than this triangle is known as equilateral triangle.
By definition of equilateral triangle it is known that all the sides of a triangle are equal and by the angle sum property tells us that a triangle's angles add up to 180. It also tells us that every side of a triangle is the same, and every angle of an equilateral triangle is the same.
Let each angle of triangle be x :
\(\begin{aligned} x+x+x&= 180^{o}\\3x&=180^{0}\\x&=60^{o}\end{aligned}\)
Therefore, each angle of triangle is 60 degree.
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Solve each problem. write your answer and solution.
1. how much is done by mila when she exerted a 25n force in lifting her bag to a height of 2m?
2. a 10kg block of wood is pulled across a level ground by fore of 15n applied at an angle of 30 degree from the horizontal. how much work is done, if it is moved to a distance of 3m?
(note: f applied = 15n x cos 30 degree, cos 30 degree = 0.5)
3. what is the work done by a boy in pushing the wall of the classroom, if he
applied a force of 30n?
4. a man weighing 500n walks a flight of stairs 10m high. how much work is
done by the man?
5. a sack of rice with a mass of 120kg is lifted by a laborer in a 15m high
building. compute the amount of work done by the laborer.
Answers
1. W = 50J
2. W = 6.9J
3. Work done is same as force = 30N
4. P = 480W
Solution:1. Here given:
F = 25N
D = 2m
We have to find W = ?
Work done Formula : W= F x D
By substituting ,
W = 25 x 2
W = 50J
2. Here given,
F = 15N
Angle = 30°
distance = 3m
W = 15* 3 * cos 30
= 6.9 J
3. Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. When we apply a force of 30N to a wall, it responds with the same force.
4. The work done will be calculated using the formula:
W = mass*gravitational acceleration*height.
Furthermore,
power = work done / time.
500 + 100 = total weight
600 N = total weight
Maintain the values in the formula -
Work completed = 600*4
2400J
P = 2400/5
= 480W
Hence, the power is 480 Watt.
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what stresses you think of three things and describe what makes these situations stresssful how do they make you feel
Answers
Answer:
a lot stresses me out honestly like school work because we are virtual and it's hard cause you basically teaching yourself, secondly me maintaining to be happy i always put everybody's happiness before mine and it's just a lot for me, and lastly the thing that stresses me the most is me overthinking i ALWAYS overthink situations.
Explanation:
:/
boxcar at a rail yard is set into motion at the top of a hump. The car rolls down quietly and without friction onto a straight, level track where it couples with a flatcar of smaller mass, originally at rest, so that the two cars then roll together without friction. Consider the two cards as a system from the moment of release of the boxcar until both are rolling together. Answer the following questions yes or no. (a) Is mechanical energy of the system conserved? (b) Is momentum of the system conserved? Next consider only the process of the boxcar gaining speed as it rolls down the hump. For the boxcar and the Earth as a system, (c) is mechanical energy conserved? (d) Is momentum conserved? Finally, consider the two cars as a system as the boxcar is slowing down in the coupling process. (e) Is mechanical energy of this system conserved? (f) Is momentum of this system conserved?
Answers
A) The given statement "Is mechanical energy of the system conserved" is Yes
B) The given statement "Is momentum of the system conserved" is Yes
C) The given statement "Is mechanical energy conserved" is No
D) The given statement "Is momentum conserved" is Yes
E) The given statement "Is mechanical energy of this system conserved" is No
F) The given statement "Is momentum of this system conserved" is Yes
When the boxcar rolls down the hump, the only forces acting on it are gravitational forces, which are conservative forces. As a result, the mechanical energy of the boxcar-earth system is conserved as it rolls down the hump.The two cars will both be traveling at the same speed and direction once they are coupled together. As a result, the momentum of the system will be conserved when the boxcar and flatcar couple together.
For the boxcar and the Earth as a system, the mechanical energy is not conserved since energy is converted to kinetic energy in the process of the boxcar gaining speed. However, momentum is conserved as the boxcar accelerates down the hump.
When the boxcar is slowing down in the coupling process, energy is converted to thermal energy and sound energy. As a result, the mechanical energy of this system is not conserved. However, the momentum of this system is conserved.
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Device A has a current of 0.4 A and a resistance of 3 Ω. Device B has a current of 0.6 A and a resistance of 3Ω. Which device would be more energy efficient?
Answers
Your answer would be Device A.
Answer:
Device A because it would use more voltage :D
Explanation:
The table contains the planets in our solar system in order of their average distance from the Sun and their corresponding diameters. The first step in creating a model of the solar system is to scale these large diameters into smaller, more manageable numbers. Eventually, we’ll represent these numbers using circles drawn on paper. MercuryVenusEarthMarsJupiterSaturnUranusNeptune Diameter (km)487912,10412,7566792142,984120,53651,11849,528 Scaled Diameter (cm) 3.51.9 The ratio between Earth’s actual diameter and its scaled diameter can be used to find the scaled diameter of the other planets. Earth’s diameter of 12,756 kilometers is scaled to 3.5 centimeters as shown in the table. Now let’s find the scaled diameter of Mars as an example. Using the calculations shown, Mars’s diameter of 6,792 would be scaled to 1.9 centimeters. d × 12,756 = 6,792 × 3.5 d = 1.9 cm Use this same process to complete the table with the scaled diameters of the other planets. Round each answer to the tenths place. If you need additional math help, visit the Proportions section of the Math Review.
Answers
The scaled diameters of the missing planets are listed below:
Mercury 1.4 cm
Venus 3.3 cm
Mars 1.9 cm
Jupiter 39.2 cm
Saturn 33.1 cm
Uranus 14.0 cm
Neptune 13.6 cm
How to determine the scaled diameters of a planet
In this question we must use conversion factor to calculate the scaled diameters by means of the following direct relationship:
d = k · D (1)
Where:
D - Real diameter, in kilometers.d - Scaled diameter, in centimeters.k - Conversion factor, in centimeters per kilometer.The conversion factor is found by using the real and scaled diameter of the Earth:
k = 3.5 cm/12,756 km
k = 7/25512 cm/km
Then, we determine the scaled diameters of the rest of planets:
Mercury 1.4 cm
Venus 3.3 cm
Mars 1.9 cm
Jupiter 39.2 cm
Saturn 33.1 cm
Uranus 14.0 cm
Neptune 13.6 cm
Remark
The statement reports a table with numerous mistakes, the correct table is shown below:
Planet Diameter (km) Scaled Diameter (cm)
Mercury 4,879
Venus 12,104
Earth 12,756 3.5
Mars 6,792
Jupiter 142,984
Saturn 120,536
Uranus 51,118
Neptune 49,528
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how are dry cells maintained
Answers
How are scientists able to predict when and where the next eclipse will occur?
Answers
Answer:
When the Earth and sun are perfectly lined up, then it will happen. They can tell when it's going to happen.
Explanation:
This is why it only happens in some places. Some days it's not sunny out, so it's not going to happen.
The minimum size of a meteoroid that is capable of surviving its passage through Earth's atmosphere and hitting the ground is about as big as
a. a car.
b. a house.
c. a basketball.
d. a grain of sand.
e. your fist.
Answers
The minimum size of a meteoroid that is capable of surviving its passage through Earth's atmosphere and hitting the ground is about as big as, option d) a grain of sand.
When meteoroids enter Earth's atmosphere, they experience high temperatures and pressures due to friction with the air. Smaller meteoroids tend to burn up completely before reaching the ground, while larger ones may break up or explode in the atmosphere.
However, some small meteoroids, typically less than a millimeter in size, can make it to the ground. These meteoroids are often called micrometeorites and are collected from places such as rooftops and polar ice caps. Despite their small size, they can provide valuable information about the composition of the early solar system. Larger meteoroids, such as those that produce meteorites, are typically at least the size of a basketball or larger.
Therefore,the minimum size of a meteoroid that is capable of surviving its passage through Earth's atmosphere and hitting the ground is about as big as, option d) a grain of sand.
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PLEASE HELP ME ASAP!!!
Answers
Answer:
90
Explanation:
The portion where gas turns to liquid
Name the two types of vaporization and explain the difference between them. Give one example of each.
Answers
Evaporation refers to only the surface level turning it into a gas and the vaporization pressure of the liquid remains low.
When a substance boils it’s pressure is high and the surface evaporated along with the rest of the liquid at an equal rate. A sign of boiling is the presence of bubbles, which occur only in the process of boiling and not in evaporation.
A example of boiling is heating water up to the point until you see steam and bubbles.
A example of evaporation is the melting of an ice cube.
Hope this helps
We have that for the Question "Name the two types of vaporization and explain the difference between them. Give one example of each. " it can be said that the types of vaporization are
EvaporationHere privatization of liquid will only happen at the surface of the liquid exclusion then other sections of the liquid
BoilingThis is is a phenomenon that occurs throughout the liquid
From the question we are told
Name the two types of vaporization and explain the difference between them. Give one example of each.
Generally
There are two types of vaporization , and they are
Evaporation BoilingEvaporation
Here privatization of liquid will only happen at the surface of the liquid exclusion then other sections of the liquid
BoilingThis is is a phenomenon that occurs throughout the liquid
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Look at the picture of the galaxy, above. What type of galaxy is this?
A.
spiral
B.
elliptical
C.
barred spiral
D.
irregular
Answers
Answer:
A
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Explanation:
What is the approximate wavelength of a light whose first-order bright band forms a diffraction angle of 45. 0° when it passes through a diffraction grating that has 500. 0 lines per mm?.
Answers
Answer:
1414.21 nm
Explanation:
diffraction grating equation is
d sin θ = nλ
were looking for λ
d is the distance between the slits = 1/500 mm = .002 mm = 2000 nm
θ is diffraction angle = 45
λ is the wavelength of the light (what were looking for)
n is the order of diffraction = "first-order bright band" = 1
λ = wavelength
θ = 45°
Plug in
2000sin(45°) = (1)λ
=> λ = 1414.21 nm
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1. Write two important precautions that you took during the connected in parallel?
Answers
Answer:
1)The connection should be tight.
2)The wire should be connected at the terminals not in between.
3)clean the ends of the wire by sandpaper.
4)Take the voltmeter and ammeter in proper range.
5)The rheostat should be used of low resistant(about 100).