A teacher sets up a stand carrying a convex lens of focal length 15 cm at 20.5 cm mark on the optical bench. She asks the students to suggest the position of the screen on the optical bench so that a distinct image of a distant tree is obtained on it. What should be the correct position of the screen as suggested by the students and why?
Answers
If we look at the diagram that I attached we can see that:
[tex]\frac{h_i}{h_0}=\frac{d_i}{d_0}[/tex]
Two triangles that I marked are similar and from this we get:
[tex]\frac{h_i}{h_0}=\frac{d_i-f}{f}[/tex]
The image and the object must have the same height so we get:
[tex]\frac{h_i}{h_0}=\frac{d_i-f}{f};h_i=h_0\\ 1=\frac{d_i-f}{f}\\ d_i=2f[/tex]
This tells how far the screen should be from the lens.
The position of the screen on the optical bench is:
[tex]S=20.5cm+2f=20.5+2\cdot 15cm=50.5cm[/tex]
Related Questions
the saclike structure that surrounds the glomerulus is the. a. renal pelvis b. calyx c. bowman’s capsule d. cortex e. none of the above
Answers
a machine does 1500 joules of work in 30 second What is the power of the machine
Answers
The power of the machine is calculated as the work done divided by the time taken, which in this case is 50 watts for a machine that does 1500 joules of work in 30 seconds.
Explanation:To calculate the power of the machine, we need to use the formula power equals work done divided by time taken. In this scenario, the machine does 1500 joules of work in 30 seconds. Using the definition of power (1 watt = 1 joule/second), we can compute the machine's power output.
Power = Work / Time
Power = 1500 joules / 30 seconds
Power = 50 watts
The power of the machine is 50 watts.
________ occurs when the horizontal winds move air against mountain ranges, forcing air to rise as it passes over the mountains.
Answers
Precipitation sometimes occurs when the horizontal winds move air against mountain ranges, forcing air to rise as it passes over the mountains.
This happens when the air is forced to move from low elevation to high elevation due to rising terrain. This causes the air to cool adiabatically. This increases the relative humidity and causes clouds to form, under certain conditions it can also create precipitation.
what is the best definition of intensity
a.intensity is the frequency of a wave
b.intensity is the amount of energy a wave carries per second
c. intensity is how well a sound travels through a medium
plzzzzzz help!!!!!!!!
Answers
Answer:
B
Explanation:
A is incorrect because intensity is dependent on the amplitude not on the frequency.
B is correct because intensity is the amount of energy a wave carries per second.
C is incorrect because intensity is not how well a sound travels through a medium.
The net force acting on a 5 kg discus is 50 n. what is the acceleration of the discus
Answers
Final answer:
The acceleration of the 5 kg discus is 10 m/s², calculated using Newton's second law of motion.
Explanation:
The acceleration of the 5 kg discus can be found using Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and its acceleration (F = ma). Given the net force (50 N) and the mass of the discus (5 kg), we can rearrange the formula to solve for acceleration (a = F/m).
Now, substituting the given values into the equation, we have:
a = 50 N / 5 kg
After performing the calculation, the acceleration of the discus is:
a = 10 m/s
Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s^2
Answers
mass = 12 kg
acceleration = 4 m/s^2
F = 12 * 4 = 48 N
The blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
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Amy throws a softball through the air. What are the different forces acting on the ball while it’s in the air? The softball experiences force as a result of Amy’s throw. As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of . NextReset
Answers
moving through the air is drag
and the downward pull would be due to gravity
Answer:
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity
Explanation:
When Amy throws a ball in the air then initially the force is applied by Amy to accelerate the ball in the air.
Now after throwing into the air the ball will have forces as per the FBD
Ball will have a downward force which is due to gravity and its magnitude is always remains the same
Now ball also have another force opposite to the direction of motion due to air drag.
This air drag force depends on the speed of the ball and always opposite to the velocity of the ball.
so correct answer will be
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity.
If you put a ballon in the freezer, what happens to the gas pressure in the ballon?
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during a neap tide, which phase could the moon be in? select all that apply
a. new
b. third quarter
c. first quarter
d. full
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Here is your answer:
The proper answer to this question is option B "third quarter".
Here is how:
Neap tides are caused when the moon is three thirds full which causes the current to up rise therefore making a neap tide.
Your answer is B.
If you need anymore help feel free to ask me!
Hope this helps!
Answer:
b. third quarter
c. first quarter
Explanation:
Neap tides happen in the third and first quarter of the moon phase, when the moon appears to be half full, this is because of the position of the moon and the gravitational force of the moon attracting the tides along with the gravitational force of the sun, tha causes high tides on new, and full phases, but the third quarter and first quarter, the moon makes a 90º line with the solar gravitational forces, cancelling out both forces making it low tide or neap tide.
You are standing in front of a flat large mirror. As you step 1.0 m farther from the mirror, the distance between you and your image changes by __________.
(Points : 1)
0 m
1.0 m
2.0 m
0.5 m,
Answers
Which was an idea used to promote the theory of plate tectonics
Answers
A. Mountain ranges linking in England and America
The theory of plate tectonics was promoted by the idea of continents drifting over time, which was proposed by Alfred Wegener. This concept was supported by evidence from fossils and rock formations, eventually leading to the development of the theory of plate tectonics.
Explanation:One idea used to promote the theory of plate tectonics is the concept of continents drifting over time. This idea was first proposed by Alfred Wegener in the early 20th century. He pointed out that the continents appeared to fit together like puzzle pieces, and he used evidence from fossils and rock formations to support his hypothesis of continental drift. Eventually, this idea led to the development of the theory of plate tectonics, which explains how the Earth's crust is divided into several plates that move and interact with each other.
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HELP PLEASE .
Which of the following is an example of transuranium element ?
Samarium
Uranium
Thorium
Curium
Answers
Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
Samarium, uranium, and thorium are all elements with atomic numbers less than 92, which is the atomic number of uranium. Curium is the first transuranium element, with an atomic number of 96. It was discovered in 1944 by Glenn T. Seaborg and his colleagues at the University of California, Berkeley.
Curium is a radioactive element that decays into other elements, such as plutonium and barium. It has a variety of applications, including in nuclear weapons and medical research.
The other elements in the question are not transuranium elements. Samarium is an lanthanide element with an atomic number of 62. Uranium is an actinide element with an atomic number of 92. Thorium is an actinide element with an atomic number of 90.
Therefore, Curium is the first transuranium element, with an atomic number of 96.
Hence, the correct option is D.
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Help Please..?
A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loading one barrel into the truck?
A:980J
B:19,600J
C :4900J
D :imposible to tell because velocity is not given.,
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3. Which of the following statements about features on the sun is true?
A.) Prominences look dark in regular photographs.
B.) Solar flares form when prominences connect.
C.) The number of sunspots on the sun's surface is always the same.
D.) Sunspots can greatly increase the solar wind.
Please Help Me Out!
Answers
a) prominences are gas eruptions that can form an arch and do not look dark, therefore this statement is false;
b) solar flares are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface, therefore this statement is true;
c) the number of sunspots may vary following an 11 years cycle, therefore this statement is false;
d) sunspots are colder spots on the surface and have nothing to do with solar winds, therefore this statement is false.
b) Solar flares are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface.
Solar flares eject coronal mass, they eject electrons, protons, and ions from the Sun. They produce high energy particles and radiation that are dangerous to living organisms. The earth encompasses a natural protection against these charged particles. Earth's magnetic field and atmosphere protect us from these particles.
The area around a charged object that can exert a force on other charges objects is an electric_____.
Answers
The answer is Electric force.
Today's Apple Mac computers run with the same internal hardware as the Windows-based PC.
(Points : 2)
True
False
I think it true
Answers
If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position?when released, what will be it’s kinetic energy if it flies past it’s starting position?
Answers
Answer:
Explanation:
A one volt change in potential means that the potential electrostatic energy changes by one Joule per Coulomb.
Since you would be pushing the charge against the field, and expend 10 J, the voltage would be 10 Volts higher.
That 10 J will be converted to kinetic energy if the charge flies back to the starting position without friction.
Final answer:
The voltage created when pushing 1 C of charge with 10 J of work is 10 V. Upon release, if no other forces act on the charge, it would have a kinetic energy of 10 J when it flies past its starting position.
Explanation:
When 10 J of work is done to push 1 C of charge against an electric field, the voltage (or electric potential difference) with respect to its starting position can be found using the formula V = W/Q, where V is the voltage, W is the work done, and Q is the charge. Therefore, V = 10 J / 1 C = 10 V.
According to the principle of conservation of energy, if no other forces act on the charge when it is released, all the potential energy will be converted into kinetic energy as it flies past its starting position. Therefore, the kinetic energy (KE) at that point will be equal to the work previously done on the charge, so KE = 10 J.
If the man on the left pulls on the object with a force of 500 N and the man on the right pulls on the object with a force of 750 N, what is the net force exerted on the object?
A.
1250 N to the right
B.
1250 N to the left
C.
250 N to the right
D.
250 N to the left
Answers
so pulling from opposite side will be negative
so
750+(-500)= 250N
C is the right answer
becauseause the man on the right applies greater force.
Which of the following materials is not a fluid
A. Air
B. Cork
C. Gasoline
D. Water
Answers
it has to be a cork, because air is gaseous, and can be liquidized due to the large quantity of oxygen that makes it up
In the following figure, what is the value of the potential at points a and b?
(Figure 1)
picture a square.There is a 15 v battery on the left side, a 4ohm resistor on top, a 5v battery on the right side and a 1 ohm resistor on bottom.
I need the potential at the upper right corner, and then the potential at the lower left corner.
Answers
The potential at point a is 2V, and the potential at point b is 6V.
The circuit has two voltage sources (9V and 6V) and two resistors (2Ω and 1Ω).
To find the potential at point a (the upper right corner), we can use the voltage divider formula: V_a = (6V × 1Ω) / (1Ω + 2Ω) = 2V
To find the potential at point b (the lower left corner), we can again use the voltage divider formula: V_b = (9V × 2Ω) / (1Ω + 2Ω) = 6V
If we changed the 1Ω resistor to a different value, it would affect the voltage drop across it, and therefore the voltage at point b. For example, if the bottom resistor was 0.5Ω instead of 1Ω, the voltage at point b would be higher than 6V. also if the bottom resistor was 2Ω instead of 1Ω, the voltage at point b would be lower than 6V.
During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 76.0 n/m. if the hose is stretched by 2.50 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length?
Answers
F=k*x
Where:
F = force
k = spring constant
x = displacement from initial state
We are given information:
k = 76 N/m
x = 2.5 m
We can calculate force:
F=76*2.5 = 190N
Work is defined as product of force and traveled distance:
W=F*d
traveled distance is equal to distance from relaxed to stretched position:
W=190N*2.5m = 475J
The difference in temperature between 100°C and 101°C is _____ the difference between 100K and 101K.
Answers
In fact, The relationship between temperature in Celsius and temperature in Kelvin is
[tex]T(^{\circ}C) = T(K)-273.15[/tex]
So, the absolute value of the two temperatures are different. However, there is a direct proportionality between the temperature in Celsius and the temperature in Kelvin, this means that temperature differences are equal in both units.
Let's see this with an example: let's call [tex]T_1 (C)[/tex] and [tex]T_2 (C)[/tex] two different temperatures in Celsius, and let's rewrite them in Kelvin using the previous relationship:
[tex]T_2 (C)-T_1 (C) = T_2(K)-273.15-(T_1(K)-273.15) = T_2(K)-T_1(K)[/tex]
as we can see, both the 273.15 cancel out and so the temperature difference in Celsius is equal to the temperature difference in Kelvin.
Question 3 Unsaved
Which type of galaxy is the Milky Way ?
Question 3 options:
elliptical
satellite
irregular
spiral
Answers
Although objects can go through physical and changes, the amount of matter in those objects remains the same. This is known as the Law of Conservation of Matter. Matter can be broken into smaller pieces, dissolve in liquids, change physical states, and undergo other changes while still conserving its mass. Which pairs of matter demonstrate the law of conservation? * A structure made of building blocks * The blocks of the same structure bundled in a pile with the extra binding material * A snowman * The melted remains of the same snowman * A lump of clay * The same lump broken into three pieces * 1 cup of water and one gram of salt, separated * The same cup of water with two grams of salt mixed in * A lump of clay * An identical lump added to the original * One apple * The same apple cut into slices Submit An
Answers
* The blocks of the same structure bundled in a pile
* A snowman
* The melted remains of the same snowman
* A lump of clay
* The same lump broken into three pieces
* 1 cup of water and one gram of salt, separated
* The same cup of water with one gram of salt mixed in
* One apple
* The same apple cut into slices
Answer:
A snowman
* The melted remains of the same snowman
A lump of clay
* The same lump broken into three pieces
One apple
* The same apple cut into slices
Explanation:
Which best describes the forces identified by Newton’s third law of motion?
equal and acting on different objects
equal and acting on the same object
unequal and acting on different objects
unequal and acting on the same object
Answers
Best answer is A: Equal and acting on different objects
Explanation, according to the third law of motion, this is how it works.
I can also confirm that I have tested on this question and got 100% on that test, so this answer has to be correct.
The forces identified by Newton’s third law of motion is best describes equal and acting on different objects.
What is Newton’s third law of motion?If an object exerts a force on another object, then another object must exert a force of equal magnitude and opposite direction back on first object.
Example of Newton’s third law of motion are
A swimmer moves forward by pushing off the side of pool. This way, the wall pushes in opposite direction and giving acceleration.Rockets move forward by expelling gas backward at high velocity. That means, the rocket exerts a large backward force on the gas in the rocket combustion chamber, and the gas thereby exerts a large reaction force forward on the rocket. This reaction force is called thrust.Helicopters create lift by pushing the air downward, therefore facing an upward reaction force. Birds fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air down and backward in order to get lift and forward motion.To learn more about Newton’s third law of motion here
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The radio source ________ is located in a place consistent with the center of our galaxy.
Answers
Therefore, the complete sentence is shown below:
The radio source "Sagittarius A (Sgr A)" is located in a place consistent with the center of our galaxy.
Which term could be used to explain why someone could safely sit on a hot wooden bench but not a hot metal bench? A. Radiation B. Specific heat capacity C. Convection D. Kelvin
Answers
hope this helps
A battery charger is connected to a dead battery and delivers a current of 3.5 a for 4 hours, keeping the voltage across the battery terminals at 16 v in the process. how much energy is delivered to the battery?
Answers
[tex]P=VI=(16 V)(3.5 A)=56 W[/tex]
This power is delivered for a total time of [tex]t=4h=4 \cdot 3600 s = 14400 s[/tex], so the total energy delivered to the battery is
[tex]E=Pt = (56 W)(14400 s)=806400 J=806.4 kJ[/tex]
The energy delivered to the battery by the charger is calculated using the formula E = P times t, with P = I times V. It turns out to be 806,400 joules.
The question involves calculating the energy delivered to a battery by a battery charger. To find this, we use the formula Energy (E) = Power (P) times Time (t), where Power (P) is the product of the current (I) and the voltage (V). Here, the battery charger delivers a current of 3.5 A for 4 hours (time) and maintains a constant voltage of 16 V. Therefore, we calculate the energy as follows:
Energy (E) = Power (P) times Time (t)
Power (P) = Current (I) times Voltage (V) = 3.5 A times 16 V
Energy (E) = (3.5 A times 16 V) times 4 hours
Energy (E) = 56 W times 4 hours = 224 Wh
Since 1 Wh = 3600 J, Energy (E) = 224 times 3600 J
Energy (E) = 806,400 joules
So, the battery charger delivers 806,400 joules of energy to the battery.
A wrench reduces the force needed to tighten a bolt. For this statement to be true, the wrench _____. A. decreases the input force and decreases the input distance B. increases the input force and decreases the input distance C. increases the input force and increases the input distance D. decreases the input force and increases the input distance
Answers
Answer:
D
Explanation:
Just looking at the physics of a wrench, it allows us to apply a turning force to an object. The reason a wrench is helpful is that it allows us to create a greater turning force, without necessarily changing the force applied to it.
Using the formula:
Fm = The moment of a force (the turning force)
F = The force applied
d = Distance from the fulcrum that the force is applied
Fm = F x d
This formula basically states that, if the moment of the force (output force) stays constant, then the force must decrease, if the distance increases.
Hence, the further away from the fulcrum that the force is applied (increase input distance), the less force needs to be applied (decrease input force).