Which of the following is a true statement about work?
Group of answer choices
It measure the effort it takes for an object to move
IT measures the change in an object speed
It measures how quickly an object moves
No answer text provided.
Answers
Answer:
It measure the effort it takes for an object to move
Explanation:
Work done is the force applied to move a body through a particular distance.
It can also to be said to be a measure of the effort it takes for an object to move.
The unit of work done is in Joules.
To find work done, we use the expression below:
Work done = Force x distance
Related Questions
Write the factors on which drag depends.
Answers
Answer:
Explanation:
The drag depends upon mainly four factors:
1) Size of the object
2) Shape of the object
3) Speed of the object
4) Nature of the object
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Which process occurs when an object is charged by induction?(a) An object gives another object an opposite charge without losing any of its own charge.(b) Excess electrons move from one object to another so both objects opposite charges.(c) An object produces electrons that are transferred to another object.(d) Free electrons are pulled away from their nuclei to flow through an object.
Answers
The correct answer is: (a) An object gives another object an opposite charge without losing any of its own charge.
When an object is charged by induction, it is brought near a charged object without touching it. This causes a separation of charges within the object, where charges of the opposite sign are attracted to the side closest to the charged object, while charges of the same sign are repelled to the opposite side. The end result is an object with a temporary, induced charge opposite in sign to the nearby charged object, but without any loss or gain of charge by the object itself. This process is often used in electrostatic experiments and devices.To know more about charges visit:
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two infinitely long straight wires, each carrying a current i, lie parallel to one another a distance d apart. calculate the magnitude of the force per unit length that each wire exerts on the other. when is the force attractive, and when is it repulsive. explain why, in each case
Answers
The magnitude of the force per unit length is, \(F = \dfrac{\mu_0 \times i^2}{2 \times \pi \times d}\). The force is attractive when the currents flow in the same direction in both wires, and repulsive when they flow in opposite directions.
The magnitude of the force per unit length (also known as the force per unit of current) that each wire exerts on the other can be calculated using the formula:
\(F = \dfrac{\mu_0 \times i_1 \times i_2}{2 \times \pi \times d}\)
where \(\mu_0\) is the magnetic constant (also known as the permeability of free space) and has a value of \(4\pi \times 10^{-7}\) Tm/A, i₁ and i₂ are the currents in the wires, and d is the distance between the wires.
The current is same in both the wires that is i. Hence, the force per unit length will be,
\(F = \dfrac{\mu_0 \times i \times i}{2 \times \pi \times d}\\\\F = \dfrac{\mu_0 \times i^2}{2 \times \pi \times d}\)
The force is attractive when the currents flow in the same direction in both wires, and repulsive when they flow in opposite directions. This is because the magnetic fields produced by the current-carrying wires interact with each other, and the direction of the resulting force depends on the relative orientation of the magnetic fields.
If the currents are in the same direction, the magnetic fields reinforce each other, resulting in an attractive force. If the currents are in opposite directions, the magnetic fields oppose each other, resulting in a repulsive force.
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--The complete question is, Two infinitely long straight wires, each carrying a current i, lie parallel to one another a distance d apart. Express the magnitude of the force per unit length that each wire exerts on the other in terms of i and d. When is the force attractive, and when is it repulsive. explain why, in each case.--
An astronaut is on a new planet. She discovers that is she drops a space rock from 12m above the groundnut has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?
Answers
Answer:
-0.375 m/s2
Explanation:
To find the acceleration due to gravity in this planet, we can use the Torricelli formula of UALM (uniformly accelerated linear motion):
V^2 = Vo^2 + 2*a*S
Where V is the final velocity, Vo is the inicial velocity, a is the acceleration and S is the total displacement.
With V = 3, Vo = 0 and S = -12, we have:
3^2 = 0^2 - 2*a*12
24a = -9
a = -9/24 = -0.375 m/s2
how long is the flea in the air from the time it jumps to the time it hits the ground? express your answer in seconds to three significant figures.
Answers
The time a flea spends in the air from the time it jumps to the time it hits the ground depends on the initial velocity of the jump and the acceleration due to gravity.
To calculate the time, we need to know the initial velocity and the height the flea jumps. Without this information, it is not possible to determine the time the flea spends in the air.
You will use kinematic equations to analyze a jumping flea in this problem. Assume that the free-fall acceleration is 9.80.
In standard athletics, the running leap and standing jump have an initial velocity of 9.15 and 2.70 m/s and an initial angle of jump of 21 and 38 degrees, respectively. Maximal beginning velocity strength, angle of engaged force, and height are all strongly correlated with the maximum horizontal velocity of 9.15 m/s.
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flares are caused by magnetic disturbances in the lower atmosphere of the sun. T/F
Answers
True, solar flares are caused by magnetic disturbances in the lower atmosphere of the sun. They occur when magnetic energy built up in the solar atmosphere is suddenly released.
Typically near sunspots. Sunspots are regions on the sun's surface with strong magnetic fields, which are cooler and darker than the surrounding areas. Magnetic energy release results in the emission of light, radiation, and particles, producing a bright and powerful burst known as a solar flare. These flares can release enormous amounts of energy, equivalent to millions of atomic bombs, within a few minutes.
Solar flares can impact Earth, causing geomagnetic storms that can disrupt communications, satellite operations, and power grids. They can also cause beautiful displays of auroras, like the Northern and Southern Lights. Monitoring solar flares is essential for protecting our technology and understanding more about the sun's magnetic activity and its effects on our planet. The solar corona, the Sun's outer atmosphere, is where solar flares take place. They frequently occur in areas of high magnetic activity, such as sunspots or other active zones. Magnetic fields in these active regions are rearranged and released during a solar flare, which results in energy release.
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The wavelength of a wave is 12 cm and its frequency is 120 Hz. What is its speed?
Answers
Speed = frequency / wavelength
Speed= 120 / 12
Speed = 10 cm / s
The speed of the wave is 14.4 m/s.
What is speed?Speed is the rate of change of distance.
To calculate the speed of the wave, we apply the formula below.
Formula:
v = λf............. Equation 1Where:
v = speed of the waveλ = wavelength of the wavef = frequency of the wave.From the question,
Given:
λ = 12 cm = 0.12 mf = 120 Hz.Substitute these values into equation 1
v = 0.12(120)v = 14.4 m/sHence, the speed of the wave is 14.4 m/s.
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Meadow voles are small mouse-like animals that eat plants and insects. Their niche in an ecosystem is a
A.
omnivore.
B.
herbivore.
C.
producer.
D.
scavenger.
Answers
Answer:
B. herbivore.
Explanation:
Meadow voles primarily consume plants, such as grasses, herbs, and bark, although they may also eat insects occasionally. As a result, their niche in an ecosystem is that of a herbivore, which is an organism that consumes primarily plants.
What does Newton's first law of motion imply about an object in motion?A. It will tend to slow down until it comes to rest.B. It will tend to remain at a constant velocity unless acted upon by aforce.C. It will tend to exert a friction force on the air around it.D. It will tend to accelerate until it reaches the speed of light unlessacted upon by a force.
Answers
Newton's first law of motion:
Newton's first law of motion states that a body in motion tends to remain in motion at a constant velocity unless acted on by a net external force.
Hence, the correct option is (B)
20 pts: Please write a paragraph about the big bang theory
Answers
The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a "singularity"). Then about 13.8 billion years ago,space expanded very quickly (thus the name "Big Bang"). This started the formation of atoms, which eventually led to the formation of stars and galaxies. It was Georges Lemaître who first noted (in 1927) that an expanding universe could be traced back in time to an originating single point. The universe is still expanding today, and getting colder as well.
As a whole, the universe is growing and the temperature is falling as time passes. Cosmology is the study of how the universe began and its development. Scientists who study cosmology have agreed that the Big Bang theory matches what they have observed so far.
Fred Hoyle called the theory the "Big Bang" on his radio show. He did not believe the Big Bang was correct. Scientists who did not agree with him thought the name was funny and decided to use it.
Scientists base the Big Bang theory on many different observations. The most important is the redshift of very far away galaxies. Redshift is the Doppler effect occurring in light. When an object moves away from Earth, its color rays look more similar to the color red than they actually are, because the movement stretches the wavelength of light given off by the object. Scientists use the word "red hot" to describe this stretched light wave because red is the longest wavelength on the visible spectrum. The more redshift there is, the faster the object is moving away. By measuring the redshift, scientists proved that the universe is expanding, and they can work out how fast the object is moving away from the Earth. With very exact observation and measurements, scientists believe that the universe was a singularity approximately 13.8 billion years ago. Because most things become colder as they expand, scientists assume that the universe was very small and very hot when it started.
Other observations that support the Big Bang theory are the amounts of chemical elements in the universe. Amounts of very light elements, such as hydrogen, helium, and lithium seem to agree with the theory of the Big Bang. Scientists also have found "cosmic microwaves background radiation". This radiation is known as radio waves, and they are everywhere in the universe. This radiation is now very weak and cold, but a long time ago it was very strong and very hot.
It can be said that time had no meaning before the Big Bang. If the Big Bang was the beginning of time, then there was no universe before the Big Bang, since there could not be any "before" if there was no time! Other ideas state that the Big Bang was not the beginning of time 13.8 billion years ago. Instead, some believe that there was a completely different universe before the Big Bang, and it may have been very different from the one we know today.
Nonetheless, in November 2019, Jim Peebles, awarded the 2019 Nobel Prize in Physics for his theoretical discoveries in physical cosmology.noted, in his award presentation, that he does not support the Big Bang Theory, due to the lack of concrete supporting evidence, and stated, "It's very unfortunate that one thinks of the beginning whereas in fact, we have no good theory of such a thing as the beginning."
I NEED HELP ASAP
Moment of inertia is calculated by multiplying:
a.
radius, weight
c.
mass, radius
b.
mass, weight
d.
mass, distance
Please select the best answer from the choices provided
Answers
By multiplying mass and radius, the moment of inertia is computed.
What does mass's moment of inertia mean?The mass moment of inertia, also known as rotational inertia, of a body is a measure of its resistance to a change in the direction of its rotation or angular momentum. In essence, it describes the acceleration that an object or solid experiences when torque is applied.
What does formula inertia mean?The formula for the moment of inertia is "sum of the product of mass" of each particle with "square of its distance from the axis of rotation."inertia. I = miri2 is how the moment of inertia formula is written.
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I need this as soon as possible. Electromagnet Data Tables
effect of number of coil on electromagnet
A. Number of Loops Test: Testing How the Number of Coils Affect the Strength of the Electromagnet
# of paper clips picked up by the 15 turn coil
# of paper clips picked up by the 30 turn coil
# of paper clips picked up by the 60 turn coil
Predict how many paper clips would be picked up with a 120 turn coil.
How does an Electromagnet Work?
B. Place an Iron Core in the Coil Test: Testing How an Iron Core Affects the Strength of the Electromagnet
# of paper clips without iron core
# of paper clips with iron core
Predict # of paper clips with plastic core
Increasing the Strength of an Electromagnet – Number of Batteries
C. Double the Current Through the Coil Test: How Doubling the Current Affects the Strength of the Electromagnet
# of paper clips using 1 battery
# of paper clips using 2 batteries
Predict how many paper clips would be picked up using 4 batteries
Answers
A. Number of Loops Test: Testing How the Number of Coils Affect the Strength of the Electromagnet of paper clips picked up by the 15 turn coil = 3 of paper clips picked up by the 30 turn coil = 5 of paper clips picked up by the 60 turn coil = 8
: Three data points are given in the Electromagnet Data Table A in which three different coils (with 15, 30 and 60 turns) are tested to find how many paper clips each coil can pick up. For the 15-turn coil, it can pick up 3 paper clips. Similarly, the 30 turn coil can pick up 5 paper clips. For the 60-turn coil, it can pick up 8 paper clips.Therefore 16 paper clips would be picked up with a 12 turn coil.B. Place an Iron Core in the Coil Test: Testing How an Iron Core Affects the Strength of the Electromagnet# of paper clips without iron core = 4# of paper clips with iron core = 9 the Electromagnet Data Table B shows that with the addition of an iron core in the coil, the number of paper clips picked up increases from 4 without the iron core to 9 with the iron core. So, by placing an iron core in the coil, the strength of the electromagnet increases.Predict # of paper clips with plastic core
:The number of paper clips with a plastic core is not given in the data table, so no prediction can be made based on the information provided.Increasing the Strength of an Electromagnet – Number of BatteriesC. Double the Current Through the Coil Test: How Doubling the Current Affects the Strength of the Electromagnet# of paper clips using 1 battery = 5# of paper clips using 2 batteries = 9Explanation:For this experiment, the Electromagnet Data Table C shows that by doubling the current through the coil from 1 battery to 2 batteries, the number of paper clips picked up increases from 5 to 9
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A group of students sets up an electric circuit with wires, a battery, and a light bulb. Why is there circuit called a direct circuit?
Answers
A direct circuit is so called because it is a circuit that has only one uninterrupted path for the electric current to flow from the power source (the battery) to the load (the light bulb).
What is circuit?A circuit is an electrical network or system that allows the flow of electrical current. It is composed of components such as resistors, capacitors, inductors, switches, and transistors, which are connected to each other by conductive wires or traces. The components in a circuit are arranged in a way that allows electrons to flow through the circuit in a controlled manner. A circuit may have multiple paths for electrons to travel, allowing it to be used for multiple purposes. Circuit diagrams are used to represent the physical layout of a circuit, showing how the components are connected. A circuit can be used for a variety of applications such as powering a device, controlling a system, or providing a signal. Circuits are also used to create integrated circuits that are used in modern electronics.
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breakout edu space simulation need help with questions 2 and 4?
Answers
None of the games we publish on the website have answer keys available. It's Time for Something Different is one of Breakout EDU's catchphrases. By demonstrating that teachers don't always know the answers, we hope to prove this. Nothing has to be set up; the game is ready to start.
What are the breakout EDU space simulation?Hints are merely some information to help your group get over a barrier or view the data differently; they are not solutions. When the box is opened, Breakout EDU doesn't end.
Therefore, The game's facilitator, who is watching and observing the group, provides you with these tips.
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A cliff diver running 3.60 m/s dives out horizontally from the
edge of a vertical cliff and reaches the water below 2.00 slater. How far from the base of the cliff does the diver hit the water?
Answers
Answer: 7.20 m
Explanation:
A rocket has an acceleration of 45 m/s2. If the rocket begins its take off from rest, how long does it take to reach a final velocity of 1,000 m/s?.
Answers
F = m * a. Algebra can be used to find the acceleration (a = F/m). The following formula is used to determine the final velocity; if 1000 = 0 + 45t, then 45t = 1000, then t = 1000 / 45, then t = 22.2 seconds
How much time does a rocket need to accelerate?The space shuttle must accelerate from zero to 8,000 meters per second (almost 18,000 miles per hour) in eight and a half minutes in order to reach the minimum height needed to orbit the Earth. To do this, a very special vehicle is required.
What is the rocket's speed in seconds?A rocket must travel at least 7.9 kilometers per second (4.9 miles per second) in order to reach space if it is launched from the surface of the Earth. The orbital velocity, which is 7.9 km/s and more than 20 times the speed of sound, is measured in this manner.
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A complete electric circuit includes a voltage source, current, wires, and something to _________ the flow of current.
Answers
Answer:
If you ground the flow of current like the last part of your question states you will not have a complete circuit as the circuit will open on a short circuit. To make a complete circuit operate you need a power source, an overload device to protect the conductors of the circuit, conductors to carry the current and a load across the power source which causes the current to flow in the circuit.
Explanation:
Leave any one of these things out and you will not have a complete circuit.
A complete electric circuit includes a voltage source, current, wires, and load to flow the current.
What is load in an electric circuit?An electrical load can be described as an electrical component of a circuit that consumes electrical power such as electrical appliances, bulbs, and lights. The electrical load may also refer to the power consumed by a circuit. An electrical load is opposed to a power source, such as a battery, which produces power.
If an electric circuit contains an output port, a pair of terminals that generates an electrical signal, the circuit connected to this terminal is the load. Load influences the performance of circuits according to the output voltages or currents, such as voltage sources, and amplifiers.
Mains power outlets supply power at constant voltage, with electrical appliances connected to the power circuit making up the load. When a high-power device switches on, it drastically reduces the load impedance.
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stars that lie in different places on the main sequence of the h-r diagram differ from each other mainly by having different:
Answers
Answer: The main sequence stars lying in different places differ from each other mainly by having different luminosities and temperatures.
What is an H-R diagram?
An H-R diagram is a plot of stars' luminosity (brightness) versus their surface temperature. On the x-axis, surface temperature is represented, while on the y-axis, luminosity is represented. This plot is used to analyze the characteristics of stars and can provide information such as its temperature, radius, mass, and luminosity.
It is a useful tool for astronomers because it can identify different types of stars, including giants, supergiants, and white dwarfs. It can also be used to compare the various stages of a star's life and to predict how stars evolve over time.
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The wine poured in the pot_______ heat,. Increasing in its molecular collisions that overcome the intermolecular attraction forces. Almost immediately, part of the wine_______. You cover the pot with a lid, to let the beef cook slowly and become tasty
Answers
Heat the saucepan after the wine has been added. Growing molecular collisions that defeat the forces of intermolecular attraction. A portion of the wine starts to boil away almost instantly.
What's a good illustration of molecular attraction?Example: The polar H2O molecules are drawn to the sodium and chloride ions in the beaker when NaCl and water are combined there. This interaction's potency is determined by: how big the dipole moment is.
What draws molecules together?
Polar molecules line up so that their positive ends interact with each other's negative ends. Unlike the atoms' covalent bonds in a molecule (intramolecular bonding)
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A fire is burning in a fireplace. Where is the radiation?
A. You touch warm bricks next to the fireplace
B. You can feel the heat from across the room
C. Heat is rising up from the chimney
Answers
........
what is the mass-to-light ratio of a 0.8 msun white dwarf with luminosity 0.001 lsun ? here, msun is the mass of the sun, and lsun is the sun's luminosity g
Answers
The mass-to-light ratio will be \(\frac{M_{\omega D}}{L_{\omega D}}=4.6 \times 10^6 \mathrm{~kg}/ watt\)
As per the data given in the question,
We have,
Mass of white dwarf \($M_{\omega_D}=0.8 M_{\text {sun }}$\) where \($M_{\text {sun }}$\) is the mass of the Sun
We have, Luminosity of the white dwarf \($$L_{\omega_D}=0.001 L_{\text {sun }} .$$\) ,where \($L_{\text {sun }}$\) is the Luminosity of the Sun.
Calculating Mass to light Ratio =M/L
Mass to light Ratio for Sun, \(\frac{M_{\text {sun }}}{L_{\text {sun }}}=\frac{1.989 \times 10^{30} \mathrm{~kg}}{3.867 \times 10^{26} \text { watts. }}\)
\(\frac{M_{\text {sun }}}{L_{\text {sun }}}=Y_0 \approx 5133 \mathrm{~kg} / \text { watt }\)
Hence,
\(\frac{M_{w D}}{L_{w D}}=\frac{0.9 M_{\text {sim }}}{0.001 L_{\text {sun }}}=900 \frac{M_{\text {sun }}}{L_{\text {sun }}}\\\\\therefore \frac{M_{\omega D}}{L_{\omega D}}=900 Y_{\odot}\)
\(\frac{M_{\text {wD }}}{L_{\text {sun }}} & =900 \times(5133) \mathrm{kg} / \text { watt } \\\\=4.6 \times 10^6 \mathrm{~kg} / \text { watt. }\)
Therefore, \(\frac{M_{\omega D}}{L_{\omega D}}=900 Y_0=4.6 \times 10^6 \mathrm{~kg}/ watt\)
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a branch falls from a tree.how fast is the branch moving after 0.28 seconds?
Answers
2.75 m/s. Hope this helps.
Definition of molecular machine
Answers
I need help answering these questions . Please help.
Answers
Answer:
Name: ScaleUsed for measure: Categorize and/or Quantify Variables
Measurement scales are used to categorize and/or quantify variables. This lesson describes the four scales of measurement that are commonly used in statistical analysis: nominal, ordinal, interval, and ratio scales.
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Can I get an BrainlistUnder the current law on nutrition labeling, the Nutrition Facts
panel must include
a. total calories from trans fat
b. grams of monounsaturated fat
c. grams of total fat
d. total calories from satura
Answers
The Nutrition Facts panel must include the grams of monounsaturated fat, grams of total fat, and total calories from saturated fat.
a. The total calories from trans fat are not required to be included in the Nutrition Facts panel. Trans fat is listed separately under "Total Fat" and does not have its own specific calorie value.
b. The grams of monounsaturated fat are required to be included in the Nutrition Facts panel. Monounsaturated fat is a type of fat that is beneficial for health, and its quantity is provided to help consumers make informed choices.
c. The grams of total fat are required to be included in the Nutrition Facts panel. Total fat represents the sum of all types of fats present in the food product.
d. The total calories from saturated fat are required to be included in the Nutrition Facts panel. Saturated fat is a type of fat that is associated with an increased risk of certain health conditions, and providing the calorie value helps consumers monitor their intake.
Therefore, the Nutrition Facts panel must include b. grams of monounsaturated fat, c. grams of total fat, and d. total calories from saturated fat.
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Which type of rotary instrument shank is placed into a high-speed handpiece?
a. Friction-grip
b. Straight
c. Latch-type
d. all listed
Answers
The type of rotary instrument shank that is placed into a high-speed handpiece is a. Friction-grip.
This type of shank is specifically designed for use in high-speed handpieces and provides a secure connection to ensure efficient performance of the rotary instrument.
These shanks fit into the turbine of a high-speed handpiece. The standard length is 20mm long, but longer surgical lengths are available and these are commonly needed for veterinary work.
There are seven types,
The Straight Shank. The straight shank does just what it says on the tin.
The Cathedral Shank
The Tapered Shank
The Split Shank
The Knife Edge Shank
The Bypass Shank
The Interlocked Shank
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According to Newton's second law of motion, a net force on an object will cause it to accelerate. How does the Newton's law relate to the force of gravity?
Answers
Answer:
Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In this case, the constant acceleration due to gravity is written as g, and Newton's Second Law becomes F = mg.
why is it imposible for a convex mirror to form a real image?
Answers
Since the focus of a convex mirror is itself virtual and there is no actual light travelling through it, it can never produce a genuine image. The source of light appears to be behind the mirror, and the light rays never seem to merge in front of the mirror.
Convex mirrors can produce accurate images, so why?The light rays diverge after reflection, thus they will never cross on the mirror's object side. Convex mirrors therefore create fictitious pictures that are situated somewhere beyond the mirror.
Can a convex mirror create a true reflection of an?Convex and plane mirrors only create virtual pictures. A true image can only be produced using a concave mirror, and only if More than a focal length separates the item from the mirror's surface.
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Mass (kg)
2
4
6
8
12
15
Weight
(N)
20
35
55
70
105
135
What is the independent variable in this experiment
Answers
Mass.
Because mass doesn't depend on weight but weight depends on mass.
how far apart are the object and image produced by a converging lens with 35.5- cm focal length when the object is 45 cm from the lens?
Answers
To find the distance between the object and image produced by a converging lens with a 35.5 cm focal length when the object is 45 cm from the lens, you can use the lens formula:
1/f = 1/do + 1/di
Where:
f = focal length (35.5 cm)
do = object distance (45 cm)
di = image distance
Step 1: Plug in the values for f and do:
1/35.5 = 1/45 + 1/di
Step 2: Subtract 1/45 from both sides:
1/35.5 - 1/45 = 1/di
Step 3: Find a common denominator and subtract:
(45 - 35.5)/(35.5 * 45) = 1/di
9.5/(35.5 * 45) = 1/di
Step 4: Take the reciprocal of both sides:
di = (35.5 * 45)/9.5
Step 5: Calculate di:
di ≈ 168.42 cm
So, the object and image produced by the converging lens with a 35.5 cm focal length when the object is 45 cm from the lens are approximately 168.42 cm apart.
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