The temperature of the laser rod increases by 21.33 degrees Celsius each minute due to the failure of the cooling system.
When heat is transferred to an object, its temperature increases. The amount of temperature increase depends on the amount of heat transferred, the mass of the object, and its specific heat.
To calculate the temperature increase of the laser rod, we can use the formula:
ΔT = Q / (m * c)
where ΔT is the change in temperature, Q is the heat absorbed, m is the mass of the laser rod, and c is the specific heat of the material.
In our case, the laser rod is a closed system, and the heat added is 64 kcal per minute.
Substituting the given values, we get:
ΔT = 64 kcal / (5 kg * 0.3 kcal/kg•Co)
ΔT = 21.33 Co
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En un momento dado , la nadadora de una prueba de natación de 100 m espalda está debajo de la cuerda falsa de salida. Indica a) El camino recorrido si acaba de salir b) El camino recorrido si ya ha tocado el final de la piscina c) El desplazamiento de la nadadora en los casos a y b ¿Coincide en algún caso con el camino recorrido?
If at a given moment, the swimmer in a 100m backstroke swimming race then,
a) The distance traveled if she has just started is 0 meter.
b) The distance traveled if she has just started is 100 meters.
c) The displacement is 0 m in case a and 100 m is case b. No they do not coincide.
Since the swimmer has just started, therefore she has not traveled any distance yet.
As it is mentioned that the swimmer has already touched the end of the pool, she has traveled a distance of 100 meters.
The displacement of the swimmer in cases a and b is zero because displacement is the distance between the starting point and the ending point, regardless of the path taken. In case a, the swimmer has not moved from the starting point yet, so the displacement is zero. In case b, the swimmer has returned to the starting point, so the displacement is also zero.
No, the displacement does not coincide with the distance traveled in either case because the swimmer's path is not necessarily a straight line from the starting point to the ending point. The displacement only considers the initial and final positions of the swimmer, while the distance traveled takes into account the length of the path taken by the swimmer.
Therefore, it could be concluded that at the start diatance is 0m and at the end it is 100m and the displacement at starting is 0m and at the end it is 100m. These do not coincide with each other.
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The question is :
At a given moment, the swimmer in a 100m backstroke swimming race is below the false start rope. State :
a) The distance traveled if she has just started
b) The distance traveled if she has already touched the end of the pool
c) The displacement of the swimmer in cases a and b. Does it coincide with the distance traveled in any case?
How much work w, in joules, would you have to do to bring the third charge, q3, from very far away to the point p?
The work required to bring the third charge from very far away to the point P is approximately 36 millijoules (to two significant figures). The units are joules (J).
To calculate the work required to bring the third charge q3 from very far away to the point P, we need to know the electric potential at point P due to the other two charges q1 and q2. The electric potential at point P is given by:
V = kq1/r1 + kq2/r2
U = q3 V
where q3 is the charge of the third charge.
r1 = 0.1 m
r2 = 0.2 m
q1 = -2 μC = -2 × 10^-6 C
q2 = 3 μC = 3 × 10^-6 C
Substituting these values into the electric potential formula, we get:
V = kq1/r1 + kq2/r2
V = (9 × 10^9 N m^2/C^2) × [(-2 × 10^-6 C)/0.1 m + (3 × 10^-6 C)/0.2 m]
V ≈ 9000 V
final = q3 V
final = (4 μC) × (9000 V)
final = 36000 μJ
final = 36 mJ
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A soccer ball with a mass of 0.43 kg is thrown to a 63 kg girl at rest who is wearing roller blades. She catches the ball and moves to the right. Her speed just after catching the ball is 0.2 m/s.
The girl and the ball together move to the right with a velocity of approximately 0.0003 m/s just after the ball is caught. This is a very small velocity, so we can say that the girl is essentially at rest relative to the ground.
What is the conservation of momentum principle?The total momentum of the system before the ball is thrown is zero, since both the ball and the girl are at rest. After the ball is thrown and caught, the total momentum of the system is still zero, since the girl and the ball are now moving together.
Let's first calculate the velocity of the ball just before it is caught by the girl. We can use the conservation of momentum equation:
m1v1 + m2v2 = (m1 + m2)v
where m1 and v1 are the mass and velocity of the ball before it is thrown, m2 and v2 are the mass and velocity of the girl before she catches the ball, and v is their common velocity after the ball is caught.
Since the girl is at rest before catching the ball, v2 = 0. Plugging in the given values, we have:
(0.43 kg)(v1) + (63 kg)(0 m/s) = (0.43 kg + 63 kg)(0.2 m/s)
Solving for v1, we get:
v1 = (63 kg)(0.2 m/s) / (0.43 kg + 63 kg)
v1 ≈ 0.012 m/s
Therefore, the velocity of the ball just before it is caught by the girl is approximately 0.012 m/s.
Now let's calculate the velocity of the girl and the ball together just after the ball is caught. We can again use the conservation of momentum equation:
m1v1 + m2v2 = (m1 + m2)v
where v1 is the velocity of the ball just before it is caught (which we just calculated), m1 and m2 are the masses of the ball and girl, and v is their common velocity just after the ball is caught.
Plugging in the given values, we have:
(0.43 kg)(0.012 m/s) + (63 kg)(0 m/s) = (0.43 kg + 63 kg)(v)
Solving for v, we get:
v = (0.43 kg)(0.012 m/s) / (0.43 kg + 63 kg)
v ≈ 0.0003 m/s
Therefore, the girl and the ball together move to the right with a velocity of approximately 0.0003 m/s just after the ball is caught. This is a very small velocity, so we can say that the girl is essentially at rest relative to the ground.
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pls help Cassie is taking a tour of a college campus. The tour starts at a statue where she walks 0.25 miles north, 0.18 miles west, 0.28 miles north, 0.33 miles east, then 0.78 miles south. At the end of the tour, what is Cassie's displacement vector from the statue?
a.0.21 miles, 60.0 east of south
b.0.21 miles, 34.6 south of east
c.0.30 miles, 60.0 south of east
d.0.30 miles, 34.6 east of south
Cassie's displacement vector from the statue is 0.30 miles (which is the magnitude of the vector formed by the x and y components) and it points 34.6° east of south.
So the correct answer is option d: 0.30 miles, 34.6 east of south.
What is Displacement Vector?
In physics, displacement vector is a vector that describes the change in position of an object, relative to its starting point, and it's defined as the vector that points from the initial position of the object to its final position.
o find Cassie's displacement vector from the statue, we need to determine the distance and direction from the statue to Cassie's final position. We can use vector addition to add up the individual displacement vectors for each leg of her journey:
The first leg is 0.25 miles north, which can be represented by a vector pointing straight up.
The second leg is 0.18 miles west, which can be represented by a vector pointing straight left.
The third leg is 0.28 miles north, which can be represented by a vector pointing straight up.
The fourth leg is 0.33 miles east, which can be represented by a vector pointing straight right.
The fifth leg is 0.78 miles south, which can be represented by a vector pointing straight down.
We can add these vectors together by breaking them down into their x and y components, then adding the x components separately and the y components separately. The resulting vector will have an x component and a y component that give us the total distance and direction from the statue to Cassie's final position.
The x components of the vectors are:
0 (no x component for the first leg)
-0.18 miles (negative because it's pointing left)
0 (no x component for the third leg)
0.33 miles
0 (no x component for the fifth leg)
Adding these together gives us a total x displacement of:
0 + (-0.18) + 0 + 0.33 + 0 = 0.15 miles east
The y components of the vectors are:
0.25 miles
0 (no y component for the second leg)
0.28 miles
0 (no y component for the fourth leg)
-0.78 miles (negative because it's pointing down)
Adding these together gives us a total y displacement of:
0.25 + 0 + 0.28 + 0 + (-0.78) = -0.25 miles south
Therefore, Cassie's displacement vector from the statue is 0.30 miles (which is the magnitude of the vector formed by the x and y components) and it points 34.6° east of south.
So the correct answer is option d: 0.30 miles, 34.6 east of south.
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1.7
Which ONE of the vector diagrams below will result in the largest resultant
vector?
(2)
Vector diagram B will result in the largest resultant vector. Correct option is B.
What is Vector ?Vector is a mathematical quantity which has both magnitude as well as direction. Force, displacement, velocity & acceleration etc. are the examples of vectors. Vectors are denoted by a standard letter and an arrow upon it.
The resultant(R) of two vectors R1 and R2 having angle θ between them are given by,
R² = R₁² + R₂² + 2R₁R₂cosθ
A) in this diagram single vector is there,
so R = R₁
B) in this diagram two vectors are in same direction with zero angle between them. (Cos0 = 1)
R² = R₁² + R₂² + 2R₁R₂
C) & D) In these diagrams two vectors are in opposite direction with zero angle between them. (Cos180 = -1)
R² = R₁² + R₂² - 2R₁R₂
Looking at B Two vectors will be added each other and give largest resultant vector.
Hence Option B is correct.
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Explain the difference between the everyday meaning of the phrase “conserving energy” and what scientists mean by the phrase “conservation of energy”
A 52 kg child is struck in the face by a 0. 25 kg dodgeball, as he is standing against a wall. If the child is knocked backward at 4. 2 m/s, what is the velocity of the dodgeball? (This answer is going to seem extreme)
The velocity of the dodgeball after the collision is approximately 352.8 m/s.
Using the conservation of momentum principle, we can write:
m_child * 0 + m_dodgeball * v = m_child * (-4.2) + m_dodgeball * v'
Substituting the given values, we get:
0.25 kg * v = 52 kg * (-4.2 m/s) + 0.25 kg * v'
Simplifying and solving for v', we get:
v' = (0.25 kg * v + 52 kg * 4.2 m/s) / 0.25 kg
v' = 352.8 m/s
velocity is a vector quantity that describes the rate of change of an object's position over time. It is defined as the displacement (change in position) of an object divided by the time interval over which the displacement occurred. Velocity is often expressed in units of meters per second (m/s).
Velocity includes both speed and direction, so two objects can have the same speed but different velocities if they are moving in different directions. In addition to describing the motion of objects, velocity is also used to calculate other important quantities in physics, such as acceleration and momentum. It plays a crucial role in many areas of physics, from classical mechanics to relativity, and is a fundamental concept in understanding the behavior of the physical world.
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Can someone help please
Answer:
D . All of the above
i hope you understand
HELP ME PLEASEEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Weight (N) mass (kg) x gravitational pull (N/kg)
1. What happens to your mass as you move from one planet to another?
2. On which planet did you weigh the most?
3. On which planet did you weigh the least?
4. On which planet was your weight most similar to your weight on Earth?
5. Imagine you went to Saturn. Write a short story about a day in your life there. Include details about how your different weight affected what you did?
Answer:
Q. 1 - your mass will vary from planet to planet meaning it can either decrease or increase depending on the gravitational pull of the planet
Q. 2 - jupiter since it has the highest gravitational pull
Q. 3 - moon since its gravitational pull is the least but since the moon isn't a planet it would be mercury
Q. 4 - uranus has the closest gravitational pull than of earth
Q. 5 - here's my version you can write your own if u want to
Ever since I moved to saturn I've always felt bit more heavier than before it felt like my weight had significantly increased I felt a few more kgs heavier I couldn't do much since I could only stay there for a day
That's about it
The government is hiking in the price of petroleum products time to time. It is causing the energy crisis further.
Write any two logics.
The energy crisis is generally caused by increasing the population or excessive utilization of non-renewable sources of energy.
What are the main causes of the energy crisis?Most of the time, energy crises typically have been provoked by localized shortages, wars, and market manipulation. Some have stated that government characteristics and actions like tax hikes, nationalization of energy companies, etc. are responsible for such circumstances. Definitely, these facts are true.
Apart from this, the regulation of the energy sector shifts the supply and demand of energy away from its economic equilibrium and may also be responsible for hiking the price of petroleum products from time to time. If the government may raise the price of any product, it will not be affordable for common consumers due to a lack of earnings and financial strength. This ultimately leads to an energy crisis.
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A homemade 2 liter bottle (0.200 kg) rocket is launched up into the air during a physics class. On the way back down a parachute is deployed and creates a drag force from resistance. If the rocket is moving with an acceleration of 2m / (s ^ 2) , what is the drag force created by the parachute ?
The drag force created by the parachute can be calculated using the equation F = 0.5 * ρ * A * V2, where ρ is the density of the air, A is the area of the parachute, and V is the velocity of the rocket.
What is parachute?Parachute is an aircraft device used to slow down a person or object's fall during a jump or a descent from a significant height. The device consists of a canopy made of fabric or nylon which is attached to a harness. The canopy is designed to fill with air as it descends, thus providing drag to slow the descent. Parachutes are commonly used by skydivers and BASE jumpers, as well as by military forces to safely deploy personnel and equipment.
In this case, the density of the air is 1.225 kg/m3, the area of the parachute can be estimated based on the size of the rocket, and the velocity of the rocket can be calculated using the formula V = at, where a is the acceleration and t is the time it takes for the rocket to reach the ground.
Assuming the rocket is launched at an initial velocity of 0 and the time it takes to reach the ground is 5 seconds, then the velocity of the rocket is 10 m/s.
Therefore, the drag force created by the parachute is calculated as:
F = 0.5 * 1.225 kg/m3 * (estimated area of parachute) * (10 m/s)2
F = 0.5 * 1.225 kg/m3 * (0.1 m2) * (10 m/s)2
F = 6.1375 N
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Question
Which resistors in the circuit are connected in parallel?
www
D
A. B and C
B. A and B
C. C and D
D. A and D
Answer:
DWhich resistors in the circuit are connected in parallel
B and C resistors in the circuit are connected in parallel. Hence option A is correct.
What is a parallel and series combination of resistance?When two or more resistors are connected between two same points, they are said to be connected in parallel combination(as shown in fig). The equivalent resistance is the reciprocal and the sum of reciprocals of all resistance connected in parallel combination.
1/R(p) =1/R₁+1/R₂+1/R₃...........1/Rₙ
where R(p) is the equivalent or total resistance of the circuit.
In parallel combination, same potential difference exists across each resistor. But current through each resistance is different.
When two or more resistors are connected one after other, they are said to be connected in series as shown in figure. in this combination voltage difference across each resistance is different which is given by ohms law. current flowing through each resistance is same.
equivalent resistance for series combination is given by,
R(s) = R₁ + R₂ + R₃...........+R(n).
Hence option A is correct.
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An object moves 9.71 meters east in 6.18 seconds. Calculate its velocity.
Answer:
hi
Explanation:
there is the answer
hope it helps
good luck
Why is 37 degrees the optimum temperature for e coli growth
E. coli has adapted to grow best at the optimum temperature range most conducive to its optimal enzymatic activity and metabolic processes, allowing for efficient and rapid growth in the human body.
37 degrees celsius is the most appropriate temperature for e. Coli boom due to the fact it's miles the temperature at which e. Coli can successfully carry out its metabolic tactics, which include protein synthesis, DNA replication, and mobile division.
E. Coli is a mesophilic bacterium, which means that it prospers at moderate temperatures commonly found inside the human frame (around 37°c). At decreased temperatures, inclusive of the ones located in refrigeration (4°c), e. Coli boom is slowed, and at better temperatures, such as those found in fever (above 40°c), e. Coli boom is inhibited or may even die.
The cause why e. Coli can develop and divide maximum efficiently at 37°c due to the specific enzymatic and metabolic pathways it possesses. Enzymes are organic catalysts that facilitate the chemical reactions important for existing processes. The enzymes in e. Coli functions optimally at this temperature variety, making an allowance for efficient nutrient uptake, electricity production, and cellular replication.
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A pendulum swings along path WXYZ and back again.
Resistive forces can be ignored.
which statement describes the Total energy of the bob?
A. it has a maximum value at X
B. it has a maximum value at Y
C. it has a maximum value at Z
D. it has the same value at W,X,Y and Z
- give answer with explanation please :) -
The higher up a ramp a marble is released, the further from A it lands. Why is this, from an energy perspective?
This is because the higher the marble is released, the more potential energy it has.
What is potential energy?Potential energy is the energy that is stored in an object due to its position, shape, or composition. This energy is released when the object is disturbed from its current state. Potential energy can be found in many different forms, such as gravitational, elastic, chemical, electrical, magnetic, and nuclear energy. Gravitational potential energy is the energy of an object due to its vertical position, and is calculated by multiplying its mass by the gravitational acceleration and its height. Elastic potential energy is the energy stored in a deformed material, such as a spring, that is released when the material returns to its original shape.
This potential energy is converted to kinetic energy as the marble rolls down the ramp, and this kinetic energy determines how far the marble will travel away from point A. The higher the initial potential energy, the further the marble will travel.
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Can i get help please
I believe its A. Tuberculosis
Sergio is performing 30 joules of work by pushing an object 25 meters. How much force did he put on the object?
Sergio put a force of 1.2 newtons on the object to perform 30 joules of work by pushing it 25
What is force?
Force is a physical quantity that describes the interaction between two objects, causing a change in their motion. It is measured in units of newtons (N) and is defined as the product of an object's mass and acceleration, as described by Newton's second law of motion.
The force exerted by Sergio on the object can be calculated using the formula:
Work = Force × Distance × cos(theta)
where Work is the work done (in joules), Force is the force applied (in newtons), Distance is the distance moved (in meters), and cos(theta) is the cosine of the angle between the force and the direction of motion (assuming the force is applied parallel to the direction of motion, cos(theta) = 1).
Rearranging the formula, we get:
Force = Work / (Distance × cos(theta))
Substituting the given values, we get:
Force = 30 J / (25 m × cos(0°))
Since cos(0°) = 1, we can simplify the expression to:
Force = 30 J / 25 m
Force = 1.2 N
Therefore, Sergio put a force of 1.2 newtons on the object to perform 30 joules of work by pushing it 25
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How is Schwartz's behavior of saying "uncle" beign negatively reinforcement
Answer:
is being negatively reinforced. The unpleasant stimulus that Schwartz is experiencing is the electric shock, and by yelling "Uncle!" he is reducing that stimulation and making himself feel better. As a result, he is receiving unfavorable reinforcement for his behavior.
Explanation:
A rectangular block of copper metal has a mass of 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?
From the dimensions, the volume of the block is 212.52 cm³. Then, the density of the block is its mass divided by the volume, that is 8.92 g/cm³.
What is density ?Density of a substance is the measure of its mass per unit volume. Density of a substance describes how closely its particles are packed. Higher the mass within smaller volume, higher is the density.
given dimensions of the block of copper = 8.4, 5.5 and 4.6 cm
then volume v = l b h
v = 8.4 × 5.5 × 4.6 = 212.52 cm³.
mass = 1896 g
Then, density of the block of copper is determined as follows;
density = mass/volume
d = 1896 g/ 212.52 cm³
= 8.92 g/cm³
Therefore, the density of the copper block is 8.92 g/cm³.
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An object of mass 80kg was placed in a lift ascending at 1.25ms * -2. Calculate its weight in the lift. [g=10ms]
The apparent weight of the object in the lift is 900 N.
What is meant by apparent weight in an elevator ?When a man is travelling in an elevator, his weight appears to change. His changed weight is known as apparent weight.
Here,
The elevator is ascending. So the apparent weight,
R = mg + ma
R = m(g + a)
R = 80(10 + 1.25) = 80x 11.25
R = 900 N
Hence,
The apparent weight in the lift is 900 N.
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protons and electrons are similar in that they both have ____ however protons are different in that they _____ and electrons are different in that they ____.
9. Because water consists of polar molecules, ___.
A. Water falls as sleet or snow when temperatures are cold.
B. Water can be attracted using a magnet
C. Water is attracted to the magnet north pole
D. Water molecules tend to stick together
Answer:
D water molecules tend to stick together.
Explanation:
a water molecule consists of 1 oxygen atom and 2 hydrogen atoms. because of the oxygen atom, this makes water electronegative, giving the hydrogen side a partial charge and the oxygen side a partial negative charge, making the water molecule polar. the oxygen is attracted to hydrogens, and the hydrogens are attracted to oxygens creating hydrogen bonds. hence the answer is D the water molecules tend to stick together.
PLEASE HELP PHYSICS ASAP
Transverse wave: direction of propagation is perpendicular to direction of wave
In a moving bus, a person who is near to the engine feels very warm. The method of heat transmission from the engine to the person is through
The method of heat transmission from engine to the person is through radiation.
What is heat ?Heat is a form of energy which is transferred between bodies having different temperature.
Here,
The person near to the engine feels very warm in a moving bus. This is because of the heat transfer from the engine to the person. Here the two bodies, the person and engine are not in contact and also there is no other medium to transfer the heat between them. So, the heat is transferred from the engine to the person through radiation.
Hence,
The method of heat transmission from engine to the person is through radiation.
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if a 50 N block is resting on a steel table with a coefficient of static friction
If F = 37 N, the static frictional force between the block and the table and the minimum force required to move it must be equal.
How is the minimum force of static friction determined?It is the force that regulates itself. The value of static friction varies from zero to the smallest force required to initiate motion. The formula for determining static friction is as follows: Normal Force divided by the static friction coefficient is static friction.
Is weight equivalent to static friction?Although the maximum static friction will rise, the frictional force will always be the same as the weight in mg because friction cannot accelerate an object. Because FrN can take any value less than N to balance the weight, this is the case.
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what is the qinghai earthquake compressional wave
The earth quakes are produced due to the sudden movements of tectonic plates in the earth's crust. The earthquake is one of the major natural disasters.
What is earthquake?An earthquake is defined as the shaking of the surface of the earth because of the sudden release of energy in the earth's crust. The waves created during the earthquake are called seismic waves.
The Qinghai earthquake was one of the severe earthquake which occurred on April 14, 2010 in the isolated southern Yushu Tibetan area in Qinghai province, which is in china on the northeastern portion of the plateau of Tibet.
Many peoples were killed and damaged many belongings also.
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An electron moves in a circular path with a radius of 0. 20 m at a constant speed of 1. 5 X 105 m/s. What is the period of its motion?
The period of motion of the electron is 2.09 × 10^-6 seconds.
What is period of motion ?
Period of motion can be defined as the time it takes for an object to complete one full cycle of its motion. In the context of circular motion, the period is the time it takes for an object to travel around a full circle and return to its starting position.
The period of motion, T, of an object moving in a circle can be calculated using the following formula:
T = 2πr/v
Where
r is the radius of the circle v is the speed of the objectIn this case, the electron moves in a circular path with a radius of 0.20 m at a constant speed of 1.5 × 10^5 m/s. Plugging these values into the formula gives:
T = 2π(0.20 m) / (1.5 × 10^5 m/s)
T = 2.09 × 10^-6 s
Therefore, the period of motion of the electron is 2.09 × 10^-6 seconds.
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If 450 J of work are needed to move a crate a vertical distance of 11 m, what is the weight of the crate?
The weight of the crate moved vertically is 40.9 Newton.
What is the weight of the crate?To solve this problem, we can use the formula for work done, which is:
Work done = force × displacement
Where force is the weight of the crate, distance is the vertical distance moved.
We can rearrange the formula to solve for the weight of the crate:
Force = work / displacement
Given that;
Work done = 450 JDisplacement = 11 m.Plugging in the values, we get:
Force = work / displacement
Force = 450 J / (11 m )
Force = 40.9 N
Therefore, the weight of the crate is 40.9 N.
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Lubricants reduce friction by replacing sliding friction with fluid friction.
True or False
Answer:
true
Explanation:
By adding a thin layer of oil or even water between two objects, you convert the sliding friction to fluid friction.
