A person pulls a book up a 9 cm incline plane to raise the book 2. 25 cm. A force of 8 N is required to pull up the book. What is the Mechanical advantage?
Answers
The mechanical advantage of pulling a book up a 9 cm incline plane to raise it 2.25 cm with 8 N of force is 4.5.
The ratio of the height raised to the inclined plane's length is known as the mechanical advantage (MA) of an inclined plane. In this instance, a force of 8 N and a 9 cm inclination were used to elevate the book 2.25 cm. The mechanical advantage of this configuration, calculated using the formula MA = height lifted/length of inclined plane, is determined to be 2.25/9 = 0.25. This means that the person tugging only has to exert 1 N of effort for every 0.25 cm the book is raised. In this case, the slanted plane decreases the force needed to raise the book by 4.5 (8 N/1.78 N), which is known as the mechanical advantage.
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Related Questions
When the sun rises in the morning at 8:00 a.m. and then rises again the next morning at the same time, earth is said to have
Answers
Answer:
Day and night
Explanation:
The earth rotates on its axis causing day and night. it takes the earth 14 hours to rotate on its axis
Why do the positive charges in the sugar grain not move?
1. Because protons are "stuck" in the nucleus, so they don't move between atoms in a material
2.
Because they are attracted by the negative tupperware
3. Because they are repelled by the negative tupperware
4.
Because the positive charges feel no attractive force from the tupperware
Answers
Compare and contrast speed, velocity, and acceleration. Why do their differences matter?
Answers
Answer:
Speed is a scalar quantity, that is, it is a number and indicates how fast (or slow) one travels at any given time.
Velocity is a vector quantity, this means that it has magnitude and direction, that is, how fast an object travels and its where its going (speed + the direction in which the object moves).
Acceleration is the ratio of the velocity change over the time interval in which this velocity change occurred. Acceleration as well as velocity is a vector quantity so it is made up of magnitude and direction.
The differences between these three quantities are important for the description of the movement. In the case of speed and velocity, its difference lies in the fact that velocity indicates the direction in which the movement is taking place (and speed is only a number), which in many physical phenomena the direction of movement is an important property. And the difference between acceleration and velocity is that acceleration instead of a velocity indicates a change in velocity (either in magnitude, direction or both), which tells us how fast a velocity will increase or decrease over time.
the work function of a metal is 1.96 ev. find the kinetic energy of the photoelectrons emitted when light of 320 nm falls on the metal. a. 5.83 ev c. 1.96 ev b. 1.91 ev d. 3.87 ev
Answers
The kinetic energy of the photoelectrons emitted when light of 320 nm falls on the metal is approximately 1.91 eV.
Hence, the correct option is B.
To calculate the kinetic energy of the photoelectrons emitted when light of a specific wavelength falls on a metal, we can use the equation:
Kinetic energy of photoelectrons = Energy of incident photons - Work function of the metal
First, we need to convert the given wavelength from nanometers (nm) to electron volts (eV) using the relationship:
Energy (in eV) = 1240 / Wavelength (in nm)
Given that the wavelength of the light is 320 nm, we can calculate the energy of the incident photons as follows:
Energy of incident photons = 1240 / 320
= 3.875 eV
Next, we can subtract the work function of the metal (1.96 eV) from the energy of the incident photons to find the kinetic energy of the photoelectrons:
Kinetic energy of photoelectrons = 3.875 eV - 1.96 eV
= 1.91 eV
Therefore, the kinetic energy of the photoelectrons emitted when light of 320 nm falls on the metal is approximately 1.91 eV.
Hence, the correct option is B.
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A car is travelling down a road. A displacement vs. time graph for the car is shown below. What is the velocity of the car 6 s into the car's motion?
Answers
May you attach your displacement vs. time graph picture and resend the question once again then I might be able to help you
Compare the concepts of mass and weight. Name three differences.
Answers
Answer:
1a)Mass is the amount of matter in the body.
1b)Weight is the measure of the amount of force acting on a mass due to acceleration and gravity.
2a)Mass can never be zero
2b)Weight can be zero if no gravity acts upon an object. like in space
3a) Mass does not change according to location.
3b)Weight varies according to location.
Snell's Law: Light traveling through water comes to a glass surface at an angle of incidence of
48.5 degrees. If the angle of refraction is 38.5 degrees, what is the index of refraction of the
glass?
Answers
Answer:
1. The best definition of refraction is ____.
a. passing through a boundary
b. bouncing off a boundary
c. changing speed at a boundary
d. changing direction when crossing a boundary
Answer: D
Bouncing off a boundary (choice b) is reflection. Refraction involves passing through a boundary (choice a) and changing speed (choice c); however, a light ray can exhibit both of these behaviors without undergoing refraction (for instance, if it approaches the boundary along the normal). Refraction of light must involve a change in direction; the path must be altered at the boundary.
which expression correctly describes energy using SI units
Answers
Answer:
Joule
Explanation:
energy, work, quantity of heat
m2·kg·s-2
the astronomer giovanni cassini (1625-1712) studied the family of curves with polar equations where a and c are positive real numbers. these curves are called the ovals of cassini even though they are oval shaped only for certain values of a and c. (cassini thought that these curves might represent planetary orbits better than kepler's ellipses.) investigate the variety of shapes that these curves may have. in particular, how are a and c related to each other when the curve splits into two parts?
Answers
When the oval of Cassini splits into two parts, the values of a and c are related by a² < c.
The polar equation for the ovals of Cassini is given by:
r² = (x² + y²) = (a² - c²) ± 2acosθ
where r is the distance from the origin to a point on the curve, and θ is the angle that the line connecting the origin to that point makes with the positive x-axis.
To investigate the shapes of these curves, we can consider different values of a and c. When a = c, the curve simplifies to a circle centered at the origin with radius a. When a > c, the curve is a single, closed oval shape, as shown below:
As a decreases relative to c, the oval shape becomes more elongated, as shown below:
When a = c√2, the curve splits into two separate ovals, as shown below:
As a continues to decrease, the separation between the two ovals increases, as shown below:
When a = c, the two ovals merge back into a single oval shape, but with the orientation reversed from the original shape, as shown below:
From this analysis, we can see that the relationship between a and c determines the shape of the oval of Cassini. When a = c√2, the curve splits into two separate ovals. As a decreases below this value, the separation between the ovals increases, and when a = c, the two ovals merge back into a single shape, but with the orientation reversed.
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You are in a car moving forward at 12 m/s. You throw a ball in the direction the car is moving. From your point of view, what does the ball do? what does the ball do from someone standing on the side of the roads view?
Answers
Answer: it goes the same speed as the car
Explanation:
An atom's atomic mass (mass number) is its number of
Answers
Answer:
Is equal to the sum of the number of protons and neutrons in the nucleus.
Explanation:
the three-point suspension system on most forklifts is known as
Answers
The three-point suspension system on most forklifts is commonly referred to as the "triangular suspension system."
This system consists of three main points of support that provide stability and balance to the forklift. The three points include the two front wheels and a pivot point located at the rear center of the forklift. The front wheels carry the majority of the load, while the rear pivot point allows for maneuverability and control.The triangular suspension system plays a crucial role in maintaining the forklift's stability during operation. It distributes the weight of the load evenly across the three points, minimizing the risk of tipping or imbalance. This configuration allows the forklift to navigate tight spaces, turn corners, and handle loads efficiently and safely.By utilizing the three-point suspension system, forklift operators can perform tasks with confidence, knowing that the forklift is designed to maintain stability and balance. This system is an essential feature of forklift design and contributes to the overall safety and performance of these industrial vehicles.
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why is cold air coming out of my vents when the heat is on
Answers
It could be caused by a clogged or dirty air filter, malfunctioning thermostat, or damaged heating elements. The air ducts may also be leaking, allowing cold air to seep in and mix with the heated air, which results in cold air coming out of the vents instead of warm air.
Another possible cause of cold air coming out of the vents when the heat is on could be a faulty fan or fan motor that is not working properly. This can cause the heated air to remain in the furnace instead of being distributed throughout the house. Finally, it could be due to a blocked or restricted airflow, which may cause the system to overheat and result in cold air coming out of the vents.
It is important to conduct regular maintenance on heating systems, including cleaning and replacing air filters, checking the thermostat settings, and ensuring that the air ducts are free of leaks and blockages. If the problem persists, it may be necessary to consult with a professional HVAC technician to identify and repair any underlying issues that are causing cold air to come out of the vents instead of warm air.
There are several reasons why cold air may be coming out of the vents when the heat is on, ranging from simple issues such as clogged air filters to more complex problems such as a damaged fan motor or air ducts. Regular maintenance and repair can help prevent these issues and ensure that heating systems function correctly, providing warm air throughout the house.
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Tick the correct statement and cross the wrong ones.
a) the unit of power is horsepower. __
Answers
Please, I need to finish my homework.
An object is to the left of a convex mirror. Describe the two rays needed to indicate the location and height of the image. Additionally, state what side of the mirror the image is on and whether it is real or virtual.
Answers
Answer:
mark me as the brainly plss
an electric field of constant magnitude 'e' is tangent everywhere to a curved surface of area 'a'. what is the electric flux through the curved surface?
Answers
Option B, EA is the surface's electric flux. Due to the fact that the electric flux is defined as the electric field times the surface area it traverses.
The electric flux can be calculated as EA because the surface area is known and the electric field strength is constant.
Electric flux is a measurement of the strength of an electric field flowing through a specific surface. It is calculated by dividing the electric field's strength by the surface area through which it passes.
If the surface area is known and the electric field magnitude is constant in this situation, finding the electric flux can be done by simply multiplying these two numbers.
EA is the mathematical abbreviation for this, where A denotes the surface area and E is the electric field.
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The question is -
(A) An electric field of constant magnitude is tangent everywhere to a curved surface of area . What is the electric flux through the curved surface?
a) Zero
b) EA
c) –EA
d) 2EA
e) Not enough information
Consider a beam with length L which is embedded at its left end (x = 0) and free at its right end (x = L). If the load distribution on this beam is given by w(x) = W0 sin phi x/2L, find the deflection of the beam y(x). Express your results in a normalized form as yEl/ wLvs.x/L.
Answers
The normalized deflection is given as yEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x].
The deflection of the beam can be determined using the following formula:
y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x], where
- EI is the flexural rigidity of the beam.
The normalized deflection is given as yEl/ wLvs.x/L. Therefore, substituting the given values of the load distribution and using the above formula,
the deflection of the beam is:y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x]
Normalized deflection, yEl/ wLvs.x/L = (W0 L2 sin phi/24 EI) [x3 - 3L2x2 + 2L3x] / W0 L2/Lvs.x/LyEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x]
Therefore, the deflection of the beam is given as y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x] and the normalized deflection is given as yEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x].
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if the plot is linear, show an estimated best-fit line and the measured slope. if the plot is not linear, approximate the plot with two or three lines. show these lines and their individually measured slopes.
Answers
To determine if a plot is linear or not, you need to analyze the data points on the graph. If the data points form a straight line, it is considered linear. If not, you need to approximate the plot with multiple lines.
If the plot is linear:
1. Identify the data points and observe if they form a straight line.
2. Draw a best-fit line that goes through or close to most of the data points. This line should minimize the distance between the line and the data points.
3. To calculate the slope, choose two points on the best-fit line, for example (x1, y1) and (x2, y2).
4. Calculate the slope using the formula: slope = (y2 - y1) / (x2 - x1).
If the plot is not linear:
1. Identify the sections of the graph where the data points seem to follow a linear trend.
2. Draw two or three lines that best represent the data in those sections.
3. For each line, choose two points and calculate their slopes using the same formula as mentioned above: slope = (y2 - y1) / (x2 - x1).
4. Report the individually measured slopes for each line.
By following these steps, you can estimate the best-fit lines and measure the slopes for a given plot.
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if you double your driving speed what happens to your stopping distance (the distance it takes to stop the car)?
Answers
If you double your driving speed, then the stopping distance will be four times the original.
What is the equation of motion?Equations of motion are equations that describe a physical system's behavior in terms of its motion as a function of time. Equations of motion, The three equations of the motion are,
v - u = atS = ut + 0.5(at²)v² - u² = 2aswhere
S is the distance,
u is the initial velocity,
v is the final velocity,
t is the time,
a is the acceleration.
Given that the car is traveling at a speed and is needed to be stopped, therefore, the car will deaccelerate. Also, the final velocity of the car will become 0. Therefore, we can write,
v² - u² = 2as
Substitute the values,
Final velocity, v = 0Initial velocity, u = uDistance covered, s = s₁Acceleration, a = -aTherefore, we can write,
v² - u² = 2as₁
(0)² - u² = 2(-a)s₁
-u² = -2as₁
u² = 2as₁
s₁ = u² / 2a
Now, if you double your driving speed. Therefore, we can write,
v² - u² = 2as
Substitute the values,
Final velocity, v = 0Initial velocity, u = 2uDistance covered, s = s₂Acceleration, a = -aTherefore, we can write,
v² - u² = 2as₂
(0)² - (2u)² = 2(-a)s₂
-4u² = -2as₂
4u² = 2as₂
s₂ = 4u² / 2a
Since u²/2a is equal to s₁, therefore, we can write,
s₂ = 4(u² / 2a)
s₂ = 4(s₁)
Hence, if you double your driving speed, then the stopping distance will be four times the original.
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Which of the following statements about stopping
twisting is NOT true?
A mostly occurs in individual sports
B. can result in ligament and tendon damage
C. is a movement required in most fast-paced sports
D. creates stress and strain on joints
Answers
Answer:
A
Explanation:
Answer:
man yall stop deleting my answers, the other person just said A:(
but yeah its mostly occurs in individual sports
Explanation:
an 80-cm-long, 1.0-mm-diameter steel guitar string must be tightened to a tension of 2.0 kn by turning the tuning screw. by how much is the string stretched?
Answers
The distance through which the string was stretched is equal to 1.1 cm.
Calculate how much is the string stretched?Given the following data:
Diameter of steel guitar = 1.0 mm to cm = 0.1 cm.
Length of steel guitar = 80 cm
Force = 2000 Newton
Young modulus for steel =200*10
Radius = Diameter /2 = 0.1/2 = 0.05cm
To determine the distance through which the string was stretched:
Mathematically, stress is given by the formula:
stress = force / area ....equation 1.
We would relate the tensional stress experienced by the steel guitar string to its strain as follows:
Stress = Y*strain
force/ area
Also, the area of a guitar string is given by the formula:
Area = π r²
Area =3.142 *0.05²
3.142*0.0025
Area = 0.007cm²
Substituting the parameters into eqn. 2, we have:
L = 1.1 cm
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Suppose that you had an electrically charged stick. If you divided the stick in half, each half would have half the original charge. If you split each of these halves, each piece would have a quarter of the original charge. Can you keep on dividing the charge in this manner forever
Answers
Because charge is quantized, the answer is no.
Describe 2 potential problems or limitations of ratio
analysis.
Answers
2. Overlooking External Factors: Ratio analysis primarily focuses on internal operations of a company, but there are various external factors like market conditions, industry trends, and economic cycles that can significantly impact a company's performance. These factors might not be reflected directly in the financial ratios, thus potentially leading to an incomplete understanding of the company's overall situation.
Which provides the most direct source of energy for a hurricane.
Answers
Answer: the ocean
Explanation:
What is important when it comes to winning
Answers
Answer:
satisfaction, enjoyment and fair play
Answer:
It is important to be a good sport, and even if you do not win still be happy about being able to participate, and congratulate the person that did win.
Explanation:
Hope this helped Bye!
The strength of an object's gravitational force is affected by both____
and____
Answers
Answer:
the answers are "mass" and "distance"
Explanation:
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a 1.50 m -diameter vat of liquid is 2.40 m deep. the pressure at the bottom of the vat is 1.20 atm
Answers
The pressure at the bottom of the vat is 0.232 atm.
The pressure at the bottom of the vat can be calculated using the formula P = ρgh, where P is the pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the depth of the liquid. Assuming the density of the liquid to be 1000 kg/m³, and taking the acceleration due to gravity to be 9.8 m/s², we can calculate the pressure at the bottom of the vat as follows:
P = ρgh
P = 1000 x 9.8 x 2.40
P = 23,520 Pa
To convert the pressure from Pascals to atmospheres, we divide the value by 101,325 Pa/atm:
P = 23,520 / 101,325
P = 0.232 atm
Therefore, the pressure at the bottom of the vat is 0.232 atm.
The pressure at the bottom of a 1.50 m-diameter vat of liquid, with a depth of 2.40 m, is 1.20 atm. Using the formula P = ρgh, where P is pressure, ρ is density, g is acceleration due to gravity, and h is depth, we can calculate the pressure at the bottom of the vat. Assuming a liquid density of 1000 kg/m³ and acceleration due to gravity of 9.8 m/s², the pressure at the bottom of the vat is 0.232 atm. This means that the pressure at the bottom of the vat is significantly less than the initial given pressure of 1.20 atm.
The pressure at the bottom of a vat of liquid can be calculated using the formula P = ρgh. In this scenario, the pressure at the bottom of a 1.50 m-diameter vat of liquid, with a depth of 2.40 m, was calculated to be 0.232 atm assuming a liquid density of 1000 kg/m³ and acceleration due to gravity of 9.8 m/s². The initial given pressure of 1.20 atm is significantly higher than the calculated pressure at the bottom of the vat.
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If a door within a wall is open sound produced on one side of the wall will be able to reach a person anywhere on the other side of the wall due to
Answers
It is generally knowledge that sound waves may bend around corners or pass through doorways, enabling us to hear conversations taking place in nearby rooms.
Why do we hear noise on the opposite side of the barrier?The air on the opposing side of the barrier also vibrates as a result of the audio hitting the wall. You will be able to hear some sound through a sturdy, solid wall since it won't spread the vibrations too much.
What is the term for when sound penetrates a wall?A reflecting wave is created as a sound crosses a room and collides with a wall, reintroducing some of that waveform back into the space. The originating sound will endeavor to go through the wall and into the next space. Sound Transmission is the name for the energy that remains after this transmission.
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the best scientific reason for a scientist to accept a specific theory is?
Answers
Answer:
The theory is supported by all the available observations and data.
Explanation: The scientific community will accept a theory when a sufficient body of evidence supports it. This includes experiments that refute other potential theories. Experiments should also be carried out that attempt to disprove the theory but cannot.
It should not matter who proposed the theory or who supports it, and instead should entirely be based on the quality and abundance of data supporting it.
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Any specific theory is accepted by research experiments, observations, and data supporting the theory.
A proposed theory has to be supported by enough evidence and data supporting the expected outcomes of the theory. Research and experiments are carried out both ways, in favor of the theory and against it. All the findings, supportive or contradictory, actually decide the acceptability of the proposed theory.So a proposed scientific theory is acceptable only by cross-examinations performed on it through research and experiments, and evident observations.
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in the waves lab, you changed ____ to see how it would affect wave speed.
Answers
I believe the answer is transversal or transverse.