A light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm.
Final answer:
A mirror with an inward curvature and a focal point is said to be concave. The light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm so that the light rays will converge at a point 8 cm behind the mirror.
Explanation:
A concave mirror is a mirror that curves inward, like the inside of a spoon. It has a focal point, which is the point at which parallel rays of light converge after reflecting off the mirror. The light bulb is positioned 20 cm in front of an eight cm-wide concave mirror. This means that the light rays from the bulb will reflect off the mirror and converge at a point 8 cm behind the mirror.
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Which organism in the food web above is sometimes a first-level consumer and sometimes a second-level consumer?Explain
The smallmouth bass is the organism in the food web that can be a first-level consumer or a second-level consumer depending on its diet.
Explanation:In the given food web, the organism that is sometimes a first-level consumer and sometimes a second-level consumer is the smallmouth bass.
The smallmouth bass is a first-level consumer when it feeds on the primary consumers, such as crayfish and insects. However, it can also be a second-level consumer when it feeds on other first-level consumers, like the minnows and sunfish.
Therefore, the smallmouth bass can occupy different trophic levels depending on its diet, making it a versatile consumer in the food web.
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how does the height of the Sun change throughout the year?
25 POINTS FOR CORRECT ANSWER
Stefan is writing a report about the law of reflection. In his report, he says that the angle of incidence is the angle between the surface of the mirror and the incoming ray. Do you agree with him? Why or why not?
The angle of incidence is the angle formed between the incident ray and its normal drawn on the plane. So, his statement is wrong.
What is law of reflection ?Law of reflection states that, when a light ray falls on a reflecting surface and gets reflected, the angle of incidence becomes equal to the angle of reflection.
Here,
The report given by Stefan is about the law of reflection. In the report, he says that the angle of incidence is the angle between the surface of the mirror and the incoming ray.
This not correct and I disagree with his statement because,
The angle of incidence in optics is defined as the angle formed between the incident ray on the surface and the normal drawn at the point of incidence at the surface of the mirror.
The formation of angle of incidence is given in the figure.
Hence,
The angle of incidence is the angle formed between the incident ray and its normal drawn on the plane. So, his statement is wrong.
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Attaching the image here.
a 63 kg object needs to be lifted 7 in a matter of 5 Seconds approximately how much horsepowers is required to achieve this task
High tide are experienced 12 hours apart for a certain coastline. Which of the following best explains the reason for this phenomenon?
The coastline experiences tidal bulge twice a day.
The coastline experiences tidal bulge once a day.
The coastline comes in a straight line with the moon once.
The coastline becomes 90 degress with the moon twice.
The answer is The coastline experiences tidal bulge twice a day. This occurs due to the rotation of the earth. When the sun is either on the same side as the moon or opposite side of the moon relative to the earth (which happens twice a day), then the coastline will experience high tide on these two occasions. Tides are caused by gravitational effect on water masses on the earth that cause them to bulge towards the direction of the two celestial bodies.
Answer:
The coastline experiences tidal bulge twice a day
Explanation:
how do paved parking lots and roads with concrete or asphalt affect water flow on the land?
Paved parking lots and roads with concrete or asphalt prevent water infiltration into the ground, causing surface runoff that can lead to floods, pollution, altered water cycles, and erosion.
Explanation:Paved parking lots and roads made with concrete and asphalt greatly affect the water flow on the land, especially during rainfall. This is due to the impermeability of these materials, which prevents the water from infiltrating or seeping into the ground. Instead, the water becomes surface runoff, rapidly moving across the surface and often causing flash floods, especially in urban areas where these paved surfaces are prevalent.
One environmental effect is the potential for increased pollution. As cars travel, oil and gasoline often leak onto these surfaces. Upon rainfall, these substances are picked up by the surface runoff and can pollute the surrounding areas and water bodies.
This surface runoff also alters the natural water cycle and can affect the local vegetation and soil drainage as the natural filtering capacity of the soil is bypassed. Additionally, in sloped areas, the fast moving water can cause erosion and debris or mud flows.
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If the actual frictional force is equal to 1 lb., then how much effort (force) would be required to drag a 90 lb. box up the plane?
A. 10+ lb.
B. 10- lb.
C.9+ lb.
D. 9- lb.
Could you also explain this? I am having a hard time understanding.
a cup on a table is pushed horizontally with a force of 0.7N. the cup remains at rest. what are all the forces that make up the net force on the cup, and what is the net force on the cup, in newtons
How does Sonar work?i will mark brainliest pls help
1. By passing sound waves through objects
2.by speeding up sound waves in different materials
3. By locating objects in outer space
4.by passing sound waves off of objecta
A circuit is made of 0.4 ohm wire, 150 ohm bulb and a 120ohm rheo stat connected inseries. Determine the total resistance of the resistance of the circuit?
A water skier is pulled behind a boat by a rope. The rope has a tension of 650 N and is at an angle of 27°. What is the y-component of the tension?
Answer: 295N
Explanation:
What is the period of a wave if the wavelenght is 110m and the speed is 200m/s? 2 s 100s 200,000 s 0.5 s
Answer:
hello im not here to answer the question, sorry.
There is somthin familar about your name Katelyn.
Are you Katelyn.H? from k12, 8th grade? because Im Rukaiya
Explanation:
How far away from Earth is the moon?
a.348 km
b.384,000 km
c.384,000,000 km
The distance from Earth to the Moon is approximately 384,000 kilometers, aligned with known values over the last few decades and confirmed through various calculation methods including signal transmission times and Kepler's Third Law.
Explanation:The distance from Earth to the Moon is approximately 384,000 kilometers (km). This can be inferred from the signal transmission duration of 1.28 seconds from Earth to an astronaut on the Moon, using the speed of electromagnetic radiation (which is the same as the speed of light). Considering that light travels at about 299,792 km/s, the distance is calculated as 1.28 s × 299,792 km/s = 383,654.56 km, which rounds up to approximately 384,000 km. This matches option b in the question and correlates with known values for the average distance of the Moon from Earth over the last 45 years. Furthermore, Kepler's Third Law and the month-long lunar orbit reiterate the same approximate distance.
Using Hooke's law, F subscript s p r i n g end subscript equals k increment x, find the elastic constant of a spring that stretches 2 cm when a 4 newton force is applied to it.
A. 1/2 N/cm
B. 2 N/cm
C. 4 N/cm
D. 8 N/cm
If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.
The centripetal acceleration of the object moving in uniform circular motion with a radius of 1.0 meter and completing 10 revolutions in 4.0 seconds is calculated to be 39.478 m/s²
To calculate the centripetal acceleration of an object in uniform circular motion, you can use the formula ac = v2 / R, where v is the velocity and R is the radius of the circle. In this case, since the object makes 10 revolutions in 4.0 seconds, we find the velocity by first calculating the circumference with C = 2πR, which is 2π meters because R = 1.0 meter. Then, the total distance traveled in one revolution is 2π meters, and in ten revolutions, it is 10 x 2π meters. The speed v is the total distance traveled divided by the time, so v = (10 x 2π) / 4.0 meters per second. Then, square the speed and divide by the radius to find the centripetal acceleration: ac = (10 x 2π / 4.0)2 / 1.0.
After performing the calculations, ac = 39.478 m/s² as the centripetal acceleration of the object.
Land near the ocean along the coast experience weather that is more moderate than the inland climate. So along the coast you can predict that compared to inland weather it should be during the summer and during the winter
Coastal climates are moderated by the ocean's heat inertia, leading to cooler summers and milder winters compared to inland areas. This is due to water heating and cooling more slowly than land, which stabilizes temperatures year-round.
Explanation:Coastal areas tend to experience more moderate weather compared to inland areas due to the influence of large bodies of water like oceans. The heat inertia of water means it heats and cools much more slowly than land does, resulting in coastal climates that are less variable and more moderate, even in places far north that would otherwise experience extreme temperatures. During the summer, one can expect that coastal areas would be cooler than inland regions because the ocean absorbs and retains heat more slowly. Likewise, winters along the coast are typically milder than those experienced inland because the ocean retains heat from the summer longer, releasing it slowly over time.
Facts such as Norway's coastal areas remaining ice-free through winter despite being within the Arctic region, and Canada's west coast receiving significant precipitation, illustrate how nearby water bodies moderate local climates. Similarly, urban areas in Australia like Sydney, Melbourne, and Adelaide experience moderate Type C climates because they are near the ocean, which tends to stabilize temperatures throughout the year, making them more mild compared to the greater fluctuations found in inland or more extreme latitudinal locations.
Circular motion occurs only at or near earths surface true or false
Answer:
FALSE
Explanation:
Circular motion refers to the motion of an object in a circular path. This occurs at or near the surface of the earth as well as outside the earth in the space. This can be supported by the following pieces of evidence-
(1) The moon and the other artificial satellites that are moving constantly around the earth in a circular path.
(2) The planets going around the sun forming the solar system also maintains a circular and elliptical plane.
(3) Tying a stone with a rope and swinging it in circles maintaining a constant velocity also satisfies the condition of circular motion at or near the surface of the earth.
Thus, the above-given statement is false.
Tracy pattern block divided into two equal parts and write a unit fraction to describe the area of each part explain your work
Calculate the potential difference across a 25- resistor if a 0.3-A current is flowing through it. V
Answer:
7.5 V
Explanation:
Which statement about the free enterprise system is true? It allows the citizen to own government property. It exempts the citizen from taxes if that person serves the government. It allows the citizen to share political power with the rest of the population. It allows the citizen to own and operate a private business for profit. It allows the citizen to be part of a one-class system under state control.
The true statement about the free enterprise system is that it allows citizens to own and operate a private business for profit. The correct option is: It allows the citizen to own and operate a private business for profit.
In a free enterprise system, individuals have the liberty to establish their businesses, make independent economic decisions, and compete in the market without excessive government intervention. This economic model fosters entrepreneurship, innovation, and wealth creation, as individuals are motivated to maximize their profits and meet consumer demands. Unlike a one-class system under state control, the free enterprise system promotes economic diversity and opportunities for social mobility. Citizens can engage in private enterprise, contribute to economic growth, and play an essential role in shaping the economy's direction. Therefore, correct option is: It allows the citizen to own and operate a private business for profit.
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Which statement does NOT explain the concept of the Doppler Effect?
The answer is: As a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch.
Why?
Do I just have the question wrong I am so confused I thought that as a sound source moved away, the sound waves don't compress decreasing the pitch?
Match the correct term with each part of the wave
Answer:
6 - crest
7 - amplitude
8 - wavelength
9 - trough
Explanation:
Just finished and got it correct
Consider the third period of the periodic table. Which element has the smallest atomic radius? A) argon B) scandium C) silicon D) sodium
Argon (A) has the smallest atomic radius in the third period of the periodic table due to the increased positive charge from the nucleus as we move across the period.
Explanation:The element with the smallest atomic radius in the third period of the periodic table is argon (A). Atomic radius refers to the size of an atom, which is determined by the distance between the nucleus and the outermost electron shell. In the third period, as you move from left to right, the atomic radius generally decreases because the number of protons in the nucleus increases, causing a stronger pull on the electrons and reducing the size of the atom.
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If a positively charged particle moves into a magnetic field traveling in a straight line, how would you expect it's motion to change
Explanation:
If a positively charged particle moves into a magnetic field traveling in a straight line then there will be Lorentz force which acts on the positively charged particle.
The force exerts on a moving charge in a magnetic field. This force is Lorentz force.
The expression for Lorentz force is as follows;
[tex]F=q(v\times B)[/tex]
[tex]F=qvBsin\theta[/tex]
Here, q is the charge, v is the velocity, [tex]\theta[/tex] is the angle between velocity and the magnetic field and B is the magnetic field.
There will be two conditions.
(1) If the positively charged particle moves parallel to the magnetic field then there will be no force on this particle. There is no deviation from the straight line. As the Lorentz force depends on the cross product of velocity and magnetic field. Sine 180 degree or sin 0 degree is zero in this case.
(2) If the positively charged particle moves perpendicular to the magnetic field then it follows the curved path until it completes the circle. The force is perpendicular to the direction of motion of the charged particle.
The charged particle will move in a circular motion.
why do hurricanes tend to form in warmer climates
Match what is seen through a telescope in Column A with the information that is learned from it in Column B. Column A 1. the visible light spectrum emitted by a star : the visible light spectrum emitted by a star 2. the brightness of a star : the brightness of a star 3. the color of a star : the color of a star Column B a. the distance between the star and Earth b. the chemical composition of the star c. the temperature of the star
Answer:
the visible light spectrum emitted by a star → the chemical composition of the star
the brightness of a star → the distance between the star and Earth
the color of a star → the temperature of the star
Explanation: plato :3
If the humidity in a room of volume 450 m3 at 30 ∘C is 75%, what mass of water can still evaporate from an open pan?
The additional mass of water that can evaporate before reaching full saturation is 3.42 kg for a room volume of 450 m³.
The question deals with the concepts of humidity, temperature, and the capacity of air to hold water vapor. At 30°C, the saturation vapor density of water is approximately 30.4 grams per cubic meter. If the room is at 75% relative humidity, that means the current water vapor density is 75% of the saturation vapor density. Therefore, the room currently has 0.75 × 30.4 g/m³ = 22.8 g/m³ of water vapor.
To find out how much more water can evaporate, we need to calculate the difference between the saturation vapor density and the current vapor density. This difference represents the capacity for additional water vapor before the air becomes saturated at 100% humidity. So, the additional mass of water that can evaporate into the room is (30.4 g/m³ - 22.8 g/m³) × 450 m³ = 3420 grams, or 3.42 kilograms.
graph B shows the solubility of which types of substances?
A) solid dissolved in gas
B) gas dissolved in a liquid
C) solid dissolved in a liquid
D) liquid dissolved in a liquid
Answer:
Graph B shows the solubility of gas dissolved in a liquid.
In graph B the temperature is increasing and solubility decreases
So, when temperature increases the molecules of the gas becomes free their kinetic energy increases.
Hence, their solubility decreases they will be more present in the form of vapors.
Therefore, Option B is correct that is gas dissolved in a liquid.
Answer:
B) gas dissolved in a liquid
Explanation:
How is energy essential to our way of life?