A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at 20.5DC. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m. The data from the investigation are shown in the table below.Compare the average kinetic energy of the water molecules in the bottle at 7 a.m. to the average kinetic energy of the water molecules in the bottle at 3 p.m.
Answers
The molecule were increased in kinetic energy but in a random structure. Thus, option 2 is correct.
Which of the seven types of energy can be seen in practice?Energy can take many different forms. Some examples of these are: nuclear and atomic energy, thermal energy, energy of motion, gravitational energy, electrical energy, elastic energy, fuel cells, and so on.
What kinds of real-world uses are there for thermal energy?Things are heated, water is boiled, eggs are fried, and metal is melted for automobile construction. Heat is converted into electricity at a thermal power plant, which powers our daily activities. The term "temperature" refers to the degree to which something is hot or cold. The temperature is measured in degrees Celsius.
Given:
At 3 p.m., the water temperature is raised.
The average kinetic energy of an object is proportional to its temperature. As a result, as temperature rises, so does average kinetic energy. Kinetic energy is caused by the random movement of molecules.
Correct answer: The kinetic energy of the molecule was increased, but in a random structure.
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Related Questions
the scatterplot shows five blue data points. these five points produce a regression line with slope 0. match each one of the red points (a through e) with the slope of the line after that one points is added
Answers
There will be a correlation off of the negative zero point of about 0.9 and the less steep line.
What is point line?The point's least-squares regression line. This is how it would seem, and. As a result, it is clear that the correlation coefficient for two will be around 0.75. Join the regression line using least squares. We have a positive court connection, but it isn't very strong since it will resemble this. This means that our correlation coefficient will be about 0.5 for. Check to see whether we can draw a least squares regression line connecting this point to the other locations. We're going to obtain something that approximately like this, and we see that this connection really has no directionality, Consequently, it is neither positive nor negative. As a result, for D, the correlation is zero. To add a little more interest, I'll change the colours. so that will be the case. Hey, there will be a correlation off of the negative zero point of about 0.9 and the less steep line.To learn more about scatterplot refer to:
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If the concentration of the reactants in a chemical reaction is increased, the rate of the
reaction usually
a. decreases.
B. increases.
C. remains the same.
Answers
Answer:
B. increases.
Explanation:
When the concentration of the reactants in a chemical reaction is increased, the rate of the reaction usually increases. This is because increasing the concentration of the reactants increases the number of collisions between reactant molecules, which increases the likelihood of a successful collision that leads to a reaction. This is known as the collision theory of chemical reactions.
at one instant, a 15.0-kg sled is moving over a horizontal surface of snow at 4.50 m/s. after 8.70 s have elapsed, the sled stops. use a momentum approach to find the magnitude of the average friction force acting on the sled while it was moving.
Answers
The force acting on the moving sled is equal to F = 7.76 N while it was moving.
What are momentum and speed?Momentum and velocity are different in that momentum is a measurement of an object's amount of motion, whereas velocity is a measurement of an object's speed with direction. Velocity is one of the components of momentum since momentum is equal to an object's mass multiplied by its speed.
What, for instance, is friction force?Walking - When we walk on the ground or a surface, our feet are kept firmly planted by frictional force. We frequently slip on icy or slippery surfaces because there is less friction present.
Given,
Mass of sled = 15.0 Kg
speed of snow on horizontal surface = 4.50 m/s
time taken to stop = 8.70 s
initial momentum
= m U
= 15.0 x 4.50 = 67.5 Kg.m/s
final momentum
final velocity = 0 m/s
final momentum = 0
impulse = change in momentum
impulse = force x time
equating both the formula of impulse
F x t = 67.5 - 0
F x 8.70 = 67.5
F = 7.76 N
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During a certain time interval, the net work done on an object is zero joules. We can be certain that ____.the object was at rest at the end of this intervalthe object’s final speed was the same as its initial speedthe object was at rest during this entire interval
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During a certain time interval, the net work done on an object is zero joules. We can be certain that the object's final speed was the same as its initial speed.
What is speed?Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words, velocity is a vector, whereas speed is a scalar value. the speed at which an object's position changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. The rate at which a distance changes over time is referred to as speed. It has a dimension of time-distance. As a result, the basic unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the metre per second (m/s) is the SI unit of speed.
Here,
The net work performed on an object during a specific time period is zero joules. The object's final speed was definitely the same as its starting speed, according to our calculations.
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(a) Given two point charges, Q and 2Q, a distance d apart, is there a point along the straight line that passes through them where E = 0 when their signs are opposite? If yes, state roughly where this point will be.(b) Given two point charges, Q and 2Q, a distance d apart, is there a point along the straight line that passes through them where E = 0 when their signs are the same? If yes, state roughly where this point will be.
Answers
a) electric field will be zero at (2.414 × d) distance from weaker charge Q, and at (3.414 × d) distance from the stronger charge 2Q
b) electric field will be zero at '0.414d' distance from weaker charge Q, and at '0.586d' distance from the stronger charge 2Q.
What is electric field?When charge exists in any form, an electric field is linked with each point in space. E, often known as electric field strength, electric field intensity, or just the electric field, is a mathematical constant that expresses the strength and direction of an electric field.
a)
Electric field is given by:
Assuming ₁ = Q, q₂ = 2Q, and suppose q₁ is at origin and q₂ is at x = +d
Now suppose at point P, distance x = - r electric field is zero, then
E(net) = E₁ - E₂ = 0
E₁ = E₂
kq₁/r₁² = kq₂/r₂²
r₁ = distance between q₁ and P = r
r₂ = distance between q₂ and P = d + r
Using above values:
q₁/r₁² = q₂/r₂²
Q/r² = (2Q)/(d + r)²
1/r² = 2/(d + r)²
(d + r)/r = √2
(d + r) = r × √2
r = d/((√2) - 1) = 2.414 × d
So. electric field will be zero at (2.414 × d) distance from weaker charge Q, and at (3.414 × d) distance from the stronger charge 2Q.
b)
Electric field is given by:
E = kq/R²
We know that the direction of the electric field will be away from the charge when the charge is (+)ve and towards the charge when the charge is (-)ve. Since q₁ and q₂ have the same sign in the example, the electric field between the charges will be zero.
Assuming q₁ = Q, q₂ = 2Q, and suppose q₁ is at origin and q₂ is at x = +d
Now suppose at point P, distance x = r from origin electric field is zero, then
E(net) = E₁ - E₂ = 0
E₁ = E₂
kq₁/r₁² = kq₂/r₂²
r₁ = distance between q₁ and P = r
r₂ = distance between q₂ and P = d - r
Using above values:
q₁/r₁² = q₂/r₂²
Q/r² = (2Q)/(d - r)²
1/r² = 2/(d - r)²
(d - r)/r = √2
d - r = r ×√2
r = d/((√2) + 1) = 0.414d
So, electric field will be zero at '0.414d' distance from weaker charge Q, and at '0.586d' distance from the stronger charge 2Q.
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Reflecting on what we learn
a. How does the acceleration you measured compare with the acceleration you calculated from the graph of speed vs. time? If there are differences, try to think where they might have come from.
b. Give the car a gentle push up the ramp from the bottom. The car will go up, slow down, and come down again. Is there a place in the motion where the speed of the car is zero? Is there a place where the acceleration is zero?
c. Can you think up tow configurations of ramps and cars that show the following properties:
(1) Higher speed but lower acceleration.
(2) Lower speed but higher acceleration
Answers
You will use your data to find the car's rate of acceleration in two different ways: by using an equation to calculate it and a graph to take the slope.
What does acceleration mean in layman's terms?The pace at which speed changes is known as acceleration.So because direction of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.
How do you determine acceleration?According to the formula a = v/t, kinetic energy (a) is the product of the shift in velocity (v) and the shift in time (t). In terms of meters per minute squared (m/s2), this enables you to calculate how quickly velocity varies.
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What is the momentum of a 0.15 kg ball moving at 4 m/s?
Answers
Answer:
mass of ball:0.5
acceration:4m/
force:?
we know that,
f:ma
:0.5×4
:2 newton
we have 3 liquid and we mixed them we know their density but we don't know their mass and volume how we can find the mixed of this 3 liquid density
Answers
To find the density of the mixed liquid, you will need to determine the mass and volume of each individual liquid.
How to determine mass and volume of individual liquid? One way to do this is to measure the volume of each liquid using a graduated cylinder or other measuring device, and then use that information to calculate the mass using the known density of each liquid.Once you have the mass and volume of each liquid, you can then add the masses together and divide by the total volume to find the density of the mixed liquid.Alternatively, you could use a tool such as a pycnometer to directly measure the density of each liquid, and then use that information to calculate the density of the mixed liquid.To learn more about mass of individual liquid refer:
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Keeping other factors consistent, how is voxel size affected by changing the FOV from square to rectangular?
Stays the same
Increases by a factor of 4
Increases
Decreases
Answers
Increases is voxel size affected volume by changing the FOV from square to rectangular
What factors into voxel size?How is fragment size shown in the image
The values chosen for the three procedure factors—FOV, grid size, and slice thickness—determine the size and level of detail of the voxels in MR images. The proportion of a field of view (Field - of - view) as well as the length of the matrices determines the size of the a voxel in the image's plan.
How are voxels calculated?The volume element in 3D space is known as a voxel. The pixel, combined with the width of the slice, determines its dimensions Chop.
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when a positively-charged proton is near a negatively-charged electron, which of the following will occur?
Answers
When a positively-charged proton is near a negatively-charged electron, The particles attracts each other due to electromagnetism .
What is electromagnetism in particles?Electromagnetism is the interaction of charged particles with electromagnetic fields in physics. One of the four fundamental forces of nature is the electromagnetic force. It is the dominant force in interactions between atoms and molecules. You can think of electromagnetism as a combination of electrostatics and magnetism, two separate but intertwined phenomena.
While magnetism is an interaction that only happens between charged particles in relative motion, electromagnetic forces happen between any two charged particles, causing an attraction between particles with opposite charges and a repulsion between particles with the same charge.
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Complete question:
When a positively-charged proton is near a negatively-charged electron, which of the following will occur
The particles attracts each otherThe particles repulses each otherThe particles become compoundThe particles are destroyedwhat quantities could be graphed to yield a straight line that could be used to determine the acceleration of the object? only indicate quantities that either were measured in part (b) or could be determined from quantities measured in part (b).
Answers
Choosing the proper quantities that are related to place and time and result in a graph with a straight line earns you 1 point.
Examples of answers include: x and t^2, x and 1/2 t^2
2x and t^2, sqrt(x) and t.
What is the equation for acceleration?Acceleration is the rate of change of velocity with respect to time. Mathematically, acceleration is described by the equation a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. To calculate acceleration, we need to know the initial and final velocity and the amount of time that has elapsed between them. For instance, if a car's velocity changes from 10 m/s to 20 m/s in 5 s, the acceleration can be calculated as follows: a = (20 m/s − 10 m/s) / 5 s = 2 m/s2.The equation for acceleration can also be written as a = (vf − vi) / t, where vf is the final velocity, vi is the initial velocity, and t is the amount of time elapsed.Finally, acceleration can also be calculated by dividing the change in momentum by the mass of the object. In this case, the equation is a = Δp/m, where Δp is the change in momentum and m is the mass of the object.To learn more about acceleration refer to:
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How do the physical properties of a gas compare to those of a liquid?
Gases and liquids both have a definite shape.
Liquids have a definite shape, while gases can change their shapes.
Gases take the shape of their containers, while liquids expand to fill their containers.
Liquids take the shape of their containers, while gases expand to fill their containers.
Answers
The physical properties of a gas compare to those of a liquid in the sense that liquids take the shape of their containers, while gases expand to fill their containers (option d).
What are physical properties?Physical properties are characteristics of a material that can be observed or measured without changing its chemical composition. Examples of physical properties include color, density, boiling point, etc.
Therefore, with this data, we can see that The physical properties of a gas are distinct from those of a liquid in that liquids take the shape of their containers, while gases fill them.
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Drag the tiles to the correct boxes to complete the pairs.
Match the pollution control method to its description.
incineration
settling
composting
gas adsorption
Answers
The match-ups of the various waste management are listed below.
What is waste management?
The collection, transportation, processing, and recycling or disposal of waste are all included in trash management. In order to lower environmental risks and protect resources, sustainable waste management systems incorporate advanced management techniques.
To keep as much waste out of the landfill as possible, each of us must contribute. Reduce, Reuse, and Recycle, also known as the 3 Rs of trash management, are one way to carry out that strategy.
Solid pollutants are burned during incineration.
Setting: Polluted water is permitted to remain motionless
Composting: Microorganisms are utilized to
Pollutants are drawn into contact with hard surfaces through gas adsorption.
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Answer:
Pollutants are captured through contact with solid surfaces.
-( gas adsorption )
Solid pollutants are burned and converted into harmless forms.
-( incineration )
Microbes are used to convert organic land pollutants harmless forms.
-( composting )
Polluted water is allowed to stand still for some time, until pollutants settle at the bottom. -( settling )
Explanation:
Correct/plato/edmentum
Look at the shape of the last force vs. time graph. Is the peak value of the force significantly different from the average force? Is there a way you could deliver the same impulse with a much smaller force?
Answers
There is no method to give the same impulse with a substantially smaller maximum force, even though the peak value of the force differs significantly from the average force.
How can the average force be determined from a force vs. time graph?By dividing the area under the force vs. time curve by the time, one can determine the average force (the base of the triangle in this case). As a result, the height of a triangular profile is just the peak force, and the average force is 1/2 the height.
What is the connection between time and force?The change in momentum over time is measured by force. It can be expressed as F = mass x velocity change / time.
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c.) use your formula to calculate the period of an earth satellite in a circular orbit of radius 7000 km
Answers
The period of an earth satellite in a circular orbit of radius 7000 km will be 4.4 × 10⁴ km.
What results in a circular orbit?Every orbit about an object it around "parent" is a delicate balancing act between gravitational force and the object's need to travel straight ahead. An precise force balance would result in a circular orbit, although this is uncommon.
Who conceived about circular orbits?Early in the 17th century, German scientist Johannes Kepler proposed three planetary motion principles. His predecessors' work, particularly that of Tycho Brahe and Nicolaus Copernicus, served as the foundation for his rules. The planets move in a circular route around the sun according to Copernicus' theory.
Well, this is easy as 1 period is same as circumference of a circle
so we can us the formula of circumference i.e.
C = 2πr
As r is given = 7000 km
C = 2π(7000)
[tex]$ \mathrm{C = 2 \times \frac{22}{7} (7000)}[/tex]
[tex]$ \mathrm{C = 2 \times 22} \times 1000}[/tex]
C = 44000 km or 4.4 × 10⁴ km
Thus, the period of an earth satellite in a circular orbit of radius 7000 km will be 4.4 × 10⁴ km.
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In class, we discussed angular acceleration and tangential acceleration. Describe how the simulation can be used to find each for the bugs in Ladybug Revolution.
Answers
The simulation can be used to find both angular and tangential acceleration for the bugs in Ladybug Revolution.
Describe how the simulation can be used to find each for the bugs in Ladybug Revolution?Angular acceleration can be found by calculating the change in angular velocity over time.This can be done by measuring the angle that the bug rotates and the time it takes for the bug to rotate that angle.Tangential acceleration can be found by measuring the change in velocity over time, which can be done by measuring the distance the bug travels and the time it takes for the bug to travel that distance.In the Ladybug Revolution simulation, angular acceleration and tangential acceleration can be calculated for the bugs by observing their motion in the simulation. Angular acceleration is a measure of the rate of change in angular velocity and is calculated by observing the bug’s angular velocity over time. To calculate angular acceleration, the angular velocity of the bug at two different points in time is recorded and then the difference between these velocities is divided by the time interval between the two points.Tangential acceleration is a measure of the rate of change in linear velocity and is the product of the angular acceleration and the radius of the bug’s path. To calculate tangential acceleration, the angular acceleration of the bug is multiplied by the radius of its path. This will give the tangential acceleration of the bug as it moves around the Ladybug Revolution simulation. By recording both angular acceleration and tangential acceleration over time, one can observe the bug’s motion in the simulation and analyze its motion more accurately.To learn more about angular acceleration and tangential acceleration refer to:
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A first solution is created by adding the maximum amount of Lead Nitrate that can be completely dissolved at 30°C to 10 grams of water. A second solution is created by raising the temperature to 60°C and adding the maximum amount of Lead Nitrate that can be completely dissolved. What is the percent increase in amount of lea nitrate from the first solution to the second?
Answers
The percent increase in amount of lead nitrate from the first solution to the second is 5.55%.
How does the temperature of lead nitrate affect its physical properties? As the temperature of lead nitrate increases, its physical properties change. At room temperature, lead nitrate is a white, odorless, crystalline solid. When heated, lead nitrate will decompose and form a yellow-brown powder of lead oxide and nitrogen dioxide. As the temperature continues to increase, the lead oxide will become molten and eventually vaporize, leaving behind a white, insoluble solid. At high temperatures, lead nitrate will react with moisture in the air to form a yellow-brown lead oxide and nitrogen dioxide gas. This gas can be dangerous if inhaled in large amounts, and can cause respiratory irritation. Additionally, the lead oxide can form a fine dust that is hazardous if inhaled. The melting point of lead nitrate is 305°C, and its boiling point is approximately 443°C. At temperatures above these, the physical properties of lead nitrate become increasingly unpredictable and can be hazardous.To learn more about lead nitrate refer to:
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A string can withold a maximum tension of 10N. A 1kg mass is spun around at a radius of 10m using this string. What is the maximum speed that can be attained by the mass
Answers
The maximum speed the mass of 1 kg is 10 m/s.
What is speed?Speed is the ratio of the distance of a body to time.
To calculate the maximum speed of the mass, we use the formula below.
T = mv²/r................. Equation 1Where:
T = Maximum tension in the string = 10 Nm = Mass of the spun = 1 kgv = Maximum speed attained by the mass = ?r = Radius = 10 mSubstitute these values into equation 1 and solve for v
10 = 1v²/101v² = 100v² = 100v = √100v = 10 m/sHence, the maximum speed is 10 m/s.
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enrique is given information about what causes a satellite to move tangentially to a circular path? air resistance friction inertia gravitya satellite orbiting earth. r
Answers
Because of the inertia of the satellite's motion, it will proceed tangentially to its circular orbit at the same speed, or V.
The satellite will deviate from its course with its tangential velocity because there won't be any centripetal force to keep it in a circular orbit in the absence of gravitational force. Accelerations at the centripetal axis are produced by centripetal forces. Any satellite's circular motion around a celestial body, with the exception of the Earth's rotation around the Sun, is caused by the centripetal force generated by their mutual gravitational attraction. Over the course of an orbit, tangential speed varies. The satellite's velocity and centripetal force are at right angles. With growing satellite separation from Earth, tangential speed rises. Centripetal force may occasionally slow.
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A new real estate agent earns 5% of the cost of the sold house. His first sale is a $219,000 house. How much will he earn on the sale of his first house?
Answers
The new real estate agent will earn $10428.57 on the sale of his first house.
What is percentage?A percentage is a number or ratio that can be stated as a fraction of 100 in mathematics.
Let the cost price of the house = $x.
The new real estate agent earns 5% of the cost of the sold house.
Hence, the sold price is = $(x + x × 5%)
= $ (x + x × 5/100)
= $ (105x/100)
According to the question:
(105x/100) = 219000
x = (219000 × 100)/105
= 208571.43
Hence, his earning on the sale of his first house = $219000 - $208571.43
= $10428.57
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Which material would best resist electricity?
Answers
The flow of electricity is referred to as current. Metals are generally excellent conductors, allowing current to flow freely. Insulators are materials that do not allow current to flow easily. Insulators include most nonmetal materials such as plastic, wood, and rubber.
What material can stop electricity?Electrical insulators are materials that do not allow electricity to pass through them. Plastic, rubber, wood, and glass are examples of these materials. Air also acts as an insulator. To keep electrical objects safe, most are constructed with insulators.
Electrical insulators include plastic, wood, glass, and rubber. That is why they are used to covering electrically conductive materials. The plastic that surrounds wires acts as an electrical insulator.
Thus, Insulators include most nonmetal materials such as plastic, wood, and rubber.
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when two forces are applied on an object from different direction what will be the resultant direction of the object
Answers
If two forces are applied to an object in opposite directions, the net force is the difference between the two forces. This is because both forces in opposite directions cancel each other out.
When two forces of equal strength act in opposite directions on an object, the forces cancel, resulting in a net force of zero and no motion. Equal to the sum of two forces. If two unequal forces act on an object in opposite directions, the net force is the difference between the two forces. When two forces act on any two objects in opposite directions, the net force is the difference between the two forces
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which of the following best represents the minimum coefficient of static friction required for the race card to continue to follow the circular path shown?
Answers
The following best represents the minimum coefficient of static friction required for the race card to continue following the circular path shown. μ[tex]_{s}[/tex]=v²/Rg
N cosθ=mg
N sinθ=mv²/R
So,
Tanθ=v²/Rg=μ[tex]_{s}[/tex]
So,
μ[tex]_{s}[/tex]=v²/Rg
Static friction is a force that keeps an object at rest.
The friction felt when attempting to move a stationary object on a surface without causing any relative motion between the body and the surface.
It can be defined as the force of friction that precisely balances the applied force for the duration of the body's stationary state.
The static frictional force is self-regulating, which means that it will always be equivalent and opposite to the force applied.
Static friction occurs when individuals attempt to move a stationary object on a surface without actually causing any relative motion between the body and the surface.
The correct question is:
Which of the following best represents the minimum coefficient of static friction required for the race car to continue to follow the circular path shown?
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The complete question is:
which of the following best represents the minimum coefficient of static friction required for the race card to continue to follow the circular path shown?
A) Rg/V²
B) Mv²/R
C) v²/g
D) v²/Rg
E) v²/2Rg
Justin, with a mass of 45 kg, is going down an 8.0 m high water slide. He takes a running start, giving him an initial speed of 3.0 m/s at the top of the water slide. If his speed at the bottom is 12 m/s, how much thermal energy is created by friction as he slides down the water slide?
Answers
Frictional heat generated as he descends the water slide is measured to be 490.5 J.
What causes that to be converted into heat energy by friction?
Sand that is moving will stop when it comes into contact with an obstruction due to the friction created by the contact, converting its kinetic energy to thermal energy, or heat.
m= 45Kg;
h= 8m;
vi = 3m/s
vf= 12m/s
Energy loss resulting from friction:
Final kinetic energy= Total initial energy
mgh plus 1/2mvi = - [ 1/2 m vf^2]
=> [45x9.8x8 + 1/2 x 45 x (3)^2] - 1/2 x 45 x (12)^2
=> 490.5J
What four different ways are there to transfer thermal energy?
There are several ways to transfer heat, including conduction, thermal radiation, convection, and evaporation cooling.
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evaluate each of the following to three significant figures and express each answer in sl units using an appropriate prefix: (a) 354 mg(45 km) / (0.0356 kn), (b) (0.004 53 mg) (201 ms), (c) 435 mn/23.2 mm.
Answers
The significant digits expressed in SI Units are: 0.447 kg.m/N, 0.911 kg.s and 18.8 GN/m
Significant digits are the digits in a measurement or calculation that are known with some level of accuracy. They include all digits that are certain, as well as one uncertain digit, also known as the last digit or the least significant digit. For example, in the number "12.34," the digits 1, 2, 3, and 4 are significant because they are all known with some level of accuracy. The number of significant digits in a measurement or calculation is important because it gives an indication of the precision of the measurement or calculation.
a) 354 mg (45 km)
(345 mg)(45 km)/0.0356 kN = [354(10^-3)g][45(10^3)m]/0.0356(10^3) N
= 0.447(10^3)g.m/N
= 0.447 kg.m/N
b) (0.00453Mg)(201ms) = [4.53(10^-3)(10^3)kg][201(10^-3)s]
= 0.911 kg.s
c) 435MN/23.2mm = 435(10^6) N/23.2(10^-3)m
= 18.75(10^9)N/m
= 18.8 GN/m
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a block of mass 0.10kg is attached and secured to one end of a spring with spring constant 50nm. the other end of the spring is secured to a wall. the block is pushed against the spring, which compresses the spring to a position of x
Answers
The block has maximum speed at 0.00 m, The friction block has half the initial spring potential energy at = -0.025 m
The correct answer is B,C
Friction between two lines is what?The force preventing solid surfaces, liquid layers, and sliding material components from moving in the same direction is known as friction. Friction can take many different forms: The relative lateral movement of two solid surfaces that are in contact is opposed by dry friction.
We have given the Force Constant of spring K= 50 N/m.
At x=-0.02 m, Force =-kx
F= -(-0.02\times 50)= 1N Hence Option (A) will be correct.
A ND also block has maximum speed at x=0m at equilibrium position because
All the potential Energy get converted to Kinetic Energy.
What do you mean by frictional force?The opposing force that causes two surfaces to move in that direction or in the opposite direction when they come into contact is called frictional force. Since it is a force which resists or resists the movement of something when it comes into contact with another object and slides against it,
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The correct question is
A block of mass 0.10 kg is attached and secured to one end of a spring with spring constant 50. The other end of the spring is secured to a wall. The block is pushed against the spring, which compresses the spring to a position of z=-0.04 m. When uncompressed, the end of the spring that is attached to the block is at a position of = 0.00 m. The block-spring system is then released from rest, and the block travels along a horizontal, rough track. A motion sensor is placed so that it measures the velocity of the object as it slides along the track. A graph of total mechanical energy of the block-spring system as a function of position is shown. Which of the following statements about the block-spring system are true? Select two answers.
A-The force exerted on the block by the spring at z=-0.02 m is 1 N.
B-The block has maximum speed at 0.00 m.
C-The block has half the initial spring potential energy at = -0.025 m
D-The work done by friction as the block travels from -0.04 m to -0.02 m is 0.01 J.
Four particles have the following masses (in terms of m), speeds (in terms of v), and radii (in terms of r). Which two particles have the same centripetal force?
Particle Mass Speed Radius
1 m v r
2 m/4 2v r
3 2m v/2 r
4 3m 2v 3r
(A) Particle 1
(B) Particle 2
(C) Particle 3
(D) Particle 4
Answers
Particle 1 and Particle 2 these two particles have the same centripetal force.
correct option: (A) and (B)
What is centripetal force?Any force that changes the direction of motion toward the center of a circular motion is known as a centripetal force. The part of the force that produces the centripetal force is the part that is perpendicular to the velocity. Due to Earth's permanent axis of rotation, the direction of centrifugal force is always outward and away from the axis, which is the opposite of the direction of gravity at the equator and zero in the poles.
The direction of centrifugal force is always outward and away from the axis because the Earth revolves around a fixed axis. At the equator, it is therefore the opposite of the direction of gravity; at the poles, it is zero.
Centripetal acceleration is given by: a = v²/r
For particle 1: a₁ = v²/r
For particle 2: a₂ = (2v)²/2r = 2v²/r
For particle 3: a₃ = (v/2)²/r = v²/4r
For particle 4: a₄ = (2v)²/3r = 4v²/3r
centripetal force (F) = ma
Thus,
F₁ = = ma = mv²/r
F₂ = (m/2)a₂ = mv²/r
F₃ = 2ma₃ = 2mv²/4r = mv²/2r
F₄ = m4v²/3r = 4/3mv²/r
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a block of weight w is pulled across a rough floor by a rope that exerts a force t on the block. the frictional force between the floor and the block is f. which of the following expressions equals the frictional force f when the block moves with a constant speed?
Answers
The net force is zero because it is moving at a constant speed. So, in the horizontal direction = 0. This will happen if the horizontal component of T, Tcos0 is equal to the frictional force.
What do you mean by frictional force?It acts in a direction that is opposite to the motion or attempted motion of an object. Frictional force is caused by the microscopic irregularities on the surfaces that are in contact. The strength of the frictional force depends on the types of materials in contact and the amount of force pressing the two surfaces together.
An example of friction is when you try to slide a book across a table. The table exerts a frictional force on the book in the opposite direction of the motion, making it harder to slide the book. Another example is when you try to walk on a slippery surface, such as ice, the friction between your shoes and the ice is reduced, making it harder to walk. Friction also plays a role in many everyday activities such as driving a car, using a pencil, and even typing on a keyboard.
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Remember that when solving radiation problems,we simplify things by measuring distancesbetween spheres center-to-center.It also helps (alot!) to make a sketch.Use the equations andconstants sheet (on Schoology) as you wish.1) We take the earth and put it into a press.ends up in the shape of a cube.We also slowdown its rotation so that one side always faces thesun. Assume that the temperature throughout thecube is uniform.a) Write an equation for the effective radiating temperature of a cube-shaped planet that has a flatside that always faces the sun.(hint: Through howmuch surface area does the cube absorb radiationrelative to the surface area through which it emitsradiation?)b)What is the effective radiating temperature ofour cubed Earth?Solve your above equation
Answers
a) The effective radiating temperature of a cube-shaped planet can be described by the equation: T_eff = (S_absorb / S_emit)^(1/4) * T_sun, where T_eff is the effective radiating temperature, S_absorb is the surface area through which the cube absorbs radiation, S_emit is the surface area through which the cube emits radiation, and T_sun is the temperature of the sun.
What is radiating temperature?The effective radiating temperature of a planet is a measure of the temperature at which the planet emits radiation to its surroundings. It can be determined by considering the ratio of the surface area through which the planet absorbs radiation to the surface area through which it emits radiation. This ratio can be represented by the equation T_eff = (S_absorb / S_emit)^(1/4) * T_sun, where T_eff is the effective radiating temperature, S_absorb is the surface area through which the planet absorbs radiation, S_emit is the surface area through which the planet emits radiation, and T_sun is the temperature of the sun. The fourth power in the formula shows that the temperature of the planet is highly dependent on the ratio of absorbed to emitted radiation.In the scenario described, the Earth has been transformed into a cube and one of its faces always facing the sun. The temperature throughout the cube is assumed to be uniform. To find the effective radiating temperature of this cubed Earth, we would need to know the specific values of S_absorb and S_emit. Without this information, it is not possible to determine the effective radiating temperature of the cubed Earth.To learn more about radiating temperature refer:
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Which of the following is not a vector? O Torque O Linear momentum O Moment of inertia O Angular momentum
Answers
A vector is not a moment of inertia. A body's inertia is a quality that makes it resist attempts to set it in movement or, if it is already moving, then change the speed or direction of it.
Describe inertia using an example.
The resistance the body offers to remain in constant motion in the absence of an external force is known as the inertia of motion. For instance, the inertia of motion causes people to slide backward when a speeding bus suddenly stops.
What are inertia and the SI unit of it?
The quality of inertia is the incapacity of an object to alter its position or the conformation of a particular body. Kilo grammes are the SI unit of inertia because mass is a measurement of inertia. Kg m2 is the unit of inertia moment if you require one.
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