Two children are playing with a roll of paper towels. One child holds the roll between the index fingers of her hands so that it is free to rotate, and the second child pulls at constant speed on the free end of the paper towels. As the child pulls the paper towels, the radius of the roll of remaining towels decreases.(a) How does the torque on the roll change with time?
Answers
The torque on the roll of paper towels increases as the radius of the roll decreases due to the constant force being applied at a decreasing distance from the axis of rotation. When the last paper towel is pulled off the roll, the torque drops to zero. The formula for torque is torque = force x distance.
A torque is a force applied at a distance to a rotating object, causing it to rotate. A paper towel roll that is being pulled by one end is a perfect example of torque in action. The radius of the paper towel roll changes as it is pulled, so the torque on the roll also changes with time. As the radius of the paper towel roll decreases, the torque on the roll increases. This is because the force applied to the roll remains constant (since the second child is pulling at a constant speed), but the distance between the force and the axis of rotation decreases. The formula for torque is torque = force x distance.
Since the distance is decreasing, the torque must increase to maintain a constant force. As the roll gets smaller and smaller, the torque on the roll will continue to increase until it reaches a maximum when the last paper towel is pulled off the roll. At this point, the force is no longer being applied at a distance from the axis of rotation, so the torque drops to zero.
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Related Questions
Un bloque de 2 kg es lanzado a lo largo de un piso horizontal. El bloque inicia su movimiento lineal con rapidez de 5 m/s y se detiene después de recorrer 2 m. ¿Cuál es el coeficiente de fricción entre el bloque y el piso?
Answers
Answer:
El coeficiente de fricción entre el bloque y el piso es 0,64.
Explanation:
Podemos hallar el coeficiente de fricción usando la definición de trabajo:
\( W = \Delta K = K_{f} - K_{i} = -K_{i} = -\frac{1}{2}m*v^{2} \)
En donde:
Kf es la energía cinética final =0
Ki es la energía cinética inicial
m: es la masa = 2 kg
v: es la velocidad = 5 m/s
Además el trabajo es el producto de la fuerza de rozamiento (Fr) por el desplazamiento (d), por lo que tenemos:
\( -Fr*d = -\frac{1}{2}m*v^{2} \)
\((\mu mg)d = \frac{1}{2}m*v^{2}\)
\( \mu = \frac{v^{2}}{2gd} = \frac{(5 m/s)^{2}}{2*9,81 m/s^{2}*2 m} = 0,64 \)
Por lo tanto, el coeficiente de fricción entre el bloque y el piso es 0,64.
Espero que te sea de utilidad!
Someone please help meee
Answers
Answer: Your right its ( The pressure of the substance)
Explanation: MArk me as brainlisti
Answer:
The color of the substance.
Explanation:
The color. (I think, it should be right because color shouldn't affect it.)
A 0.250 kg mass is attached to a horizontal spring with a spring constant of 20.0 N/m. The mass is
pulled back and the frictionless system vibrates with simple harmonic motion. When the mass has a
displacement of 12.4 cm its speed is 0.350 m/s. What is the maximum speed of the mass?
Answers
The maximum speed of the mass suspended in the spring is 1.11 m/s.
What is the maximum speed of the mass?The maximum speed of the mass is calculated by applying the following kinematic equation as shown below.
V ( max ) = ωA
where;
ω is the angular speed of the massA is the amplitude of the massThe angular speed of the mass is calculated as follows;
ω = √ ( k / m )
where;
k is the spring constantm is the massω = √ ( 20 / 0.25 )
ω = 8.94 rad/s
The maximum speed of the mass is calculated as follows;
v = ω A
v = ( 8.94 rad/s ) x ( 0.124 m )
v = 1.11 m/s
Thus, the maximum speed of the mass is a function of the amplitude of the oscillation, and the angular speed of the oscillation.
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What can waves be transmitted by? How do you know?
Answers
Answer:
i don’t know what kind of waves you mean but if you’re talking about sound waves...
Explanation:
“Sound waves are transmitted through solids, liquids, and gases. Light waves are transmitted through transparent materials (may be clear or colored material such as filters) that allow most of the light that strikes them to pass through them. Only a small amount of light is reflected or absorbed.”
Which conclusion has been made by the world’s major scientific bodies about climate change?
a.
The recent harsh winters have placed some doubt on projected atmospheric warming.
b.
Climate change is projected to slow down during the latter half of this century.
c.
The current climate change is caused primarily by natural processes.
d.
We do not know enough about how climate works to make any definite conclusions.
e.
Climate change is real and is happening now.
Answers
The conclusion made by the world's major scientific bodies about climate change is that it is real and is happening now.
So, the correct answer is E.
There is overwhelming evidence that human activities, such as burning fossil fuels and deforestation, are the primary cause of the current climate change. While some may point to recent harsh winters as evidence against climate change, this is actually a result of the destabilization of the polar vortex due to warming.
Scientific models project that climate change will continue to worsen if significant action is not taken to reduce greenhouse gas emissions. The consensus among the scientific community is clear: climate change is a major threat to our planet and urgent action is needed to mitigate its effects.
Hence , the answer of the question is E.
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A car is sitting still what could cause the car to move
Answers
A person applies a 132 N force to a 83.3
kg sled resting on frictionless ice. At what
rate will the sled accelerate?
Answers
Answer: 1.58 m/s^2
Explanation:
Given the following :
Applied force = 132 N
Mass of sled = 83.3 kg
Rate of acceleration of sled =?
F = mass × acceleration ( Newton's 2nd law of motion)
F = Net force
Inputing the values :
F = mass × acceleration
132 = 83.3 × acceleration
acceleration = 132 / 83.3
Acceleration = 1.5846338
Acceleration = 1.58 m/s^2
which of the following schedules would produce the longest pause after each reinforcement?
Answers
FR40 schedule would produce the longest pause after each reinforcement. Option A is correct.
The Fixed Ratio (FR) schedule requires a fixed number of responses to receive a reinforcement, while the Variable Ratio (VR) schedule requires an average number of responses to receive a reinforcement. In general, VR schedules produce higher and more consistent rates of responding than FR schedules.
Based on this information, the FR40 schedule would produce the longest pause after each reinforcement because it requires the highest number of responses (40) to receive a reinforcement. The VR30 and VR60 schedules require an average of 30 and 60 responses, respectively, to receive a reinforcement, which would likely result in shorter pauses between reinforcements compared to the FR40 schedule.
The FR10 schedule requires the fewest number of responses to receive a reinforcement and would likely result in the shortest pause between reinforcements.
Hence, A. is the correct option.
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--The given question is incomplete, the complete question is
"Which of the following schedules would produce the longest pause after each reinforcement? A) FR40 B) VR30 C) VR60 D) FR10."--
Please someone help me.
is the block of wood at rest or in motion?
refer to the figure below draw the forces acting on the block of wood use the gas as the origin of the forces.
thank you very much for answering this.
Answers
Answer:
1) The block of wood is at rest.
2) Weight and Normal Reaction (see attached diagram).
Explanation:
Assumptions
The block of wood is a particle (a body whose mass acts at a point, so its dimensions don't matter).There are no other external forces involved.Question 1
"At rest" or "resting" means that the object isn't moving.
Therefore, the block of wood is at rest.
Question 2
Forces that are acting on the block of wood:
Weight (W): Due to the particle's mass, m, and the acceleration due to gravity, g: W = mg(Weight always acts downwards).Normal Reaction (R or N): The reaction from a surface.
(Normal Reaction is always at 90° to the surface).
See attached diagram.
8. If Bulb 8 burns out, how will the remaining bulbs be affected?
1
2
3
4
5
6
7
8
Answers
a tight knot can be easily opened by using a long spanner. Give reason.
Answers
Answer:
It is because the effort distance is greater than the load distance
Explanation:
As we know, Effort×effort distance = load × load distance
So when effort distance is increases,
The effort decreases
So when the spanner's handle is long
A tight knot can easily be opened by less effrot
I hope it helped
Answer:
before ed is greater than ld
12 A plane starting from rest accelerates at 3 m/s for 25 s. Calculate the
increase in velocity after:
a 1 s
b 5s
C 25 s.
Answers
Answer: 78m/s =A
u=0 ,a=3m/sec^2 ,t=25sec
v=u+at
=0+25×3
=75m/s
after 1sec
v=u+at+75
=0+3×1+75
=78m/s
Explanation:
u=0 ,a=3m/sec^2 ,t=25sec
v=u+at
=0+25×3
=75m/s
after 1sec
v=u+at+75
=0+3×1+75
=78m/s
Which types of light are absorbed by genetic material?
ultraviolet (UV)
visible
infrared (IR)
microwave F radio
Answers
Explanation:
the answerer is visible
Genetic material is known to absorb UV light. Given what we know, we can confirm that genetic material is not known to absorb light originating from an infrared or microwave radio source.
What light does genetic material absorb?Genetic material is the hereditary substance in the cell. It carries all information specific to an organism. It is known as DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)
UV light is electromagnetic radiation, and the primary source of UV light that we are exposed to is the sun.
Therefore, given that the only form of light listed that genetic material is known to absorb is that of Ultraviolet or UV light, we can confirm that the answer to the question proposed is infrared and microwave radio light.
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Describe the language of the following PDA (z is the stack end symbol) (the figure can be located under a, z/bbz X, z/z b,6/1 ۸, 2/2 90 91 92 a, b/bbb 1 b,b/1
Answers
The language of the given pushdown automaton (PDA) can be described as follows:
The PDA has a stack alphabet consisting of symbols 'a', 'b', 'z', '6', '1', '۸', '2', '9', '0', 'x', 'y'. 'z' represents the stack end symbol.
The transitions of the pushdown automaton (PDA) are as follows:
(a, z, z) -> (X, z): This transition allows the PDA to replace an 'a' at the input with an 'X' on the stack while maintaining the stack end symbol 'z'.(z, b, z) -> (z, z): This transition allows the PDA to pop a 'b' from the input without modifying the stack.(z, z, b) -> (6, 1): This transition allows the PDA to push '6' and '1' onto the stack when encountering a 'b' on the input.(6, 1, b) -> (۸, 2): This transition allows the PDA to replace the '6' and '1' on the top of the stack with '۸' and '2' respectively when another 'b' is read from the input.(x, y, b) -> (b, b, b): This transition allows the PDA to replace 'x' and 'y' on the top of the stack with 'b', 'b', and 'b' when a 'b' is read from the input.(b, b, b, b) -> (1, b): This transition allows the PDA to replace the 'b', 'b', and 'b' on the top of the stack with '1' and 'b' when another 'b' is encountered.(1, b, b) -> (1, 1): This transition allows the PDA to replace the '1' and 'b' on the top of the stack with '1' and '1' when another 'b' is read from the input.(1, 1, z) -> (z, z): This transition allows the PDA to pop '1' from the stack without modifying the input.Thus, the language accepted by this PDA is characterized by a sequence of 'a's followed by a sequence of 'b's, where the number of 'b's is three times the number of 'a's, and each 'b' is followed by a corresponding sequence of '90', '91', '92', 'a', 'b', 'b', 'b', '1', 'b', 'b', '1', and ending with '1'.
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Suppose a spectral line of hydrogen, normally at 500 nm when measured in a lab on Earth, is observed in the spectrum of a star to be at 500.3 nm. This is called a red shift because the wavelength is longer (and red is on the long-wavelength side of the visible spectrum). How fast is the star moving away from Earth? Give your answer in m/s. Hint: follow example 5.6. Compare in particular to the "Check your learning" calculation, and note that larger Δλ means larger speed.
Answers
The star is moving away from Earth at a velocity of 1.8 x 106 m/s.
The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.
The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.
The velocity of a star moving away from Earth can be determined using the equation:
v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).
In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.
The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.
Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.
Therefore, velocity of star 1.8 x 106 m/s.
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Both reverse and closed-loop systems are important strategies that impact sustainability in a positive manner. True or False
Answers
True. Both reverse and closed-loop systems are important strategies for achieving sustainability in a positive manner.
Reverse systems involve the reuse and recycling of materials to reduce waste, while closed-loop systems focus on creating a circular economy by designing products and systems that can be continuously reused and recycled. Both strategies contribute to reducing resource depletion, pollution, and landfill waste, and can lead to significant environmental and economic benefit for achieving sustainability.
In order to meet the demands of the present generation without compromising the potential of future generations to meet their own needs, sustainability is a concept. To ensure long-term wellbeing and the protection of natural resources, it entails striking a balance between environmental, social, and economic factors. Practises that support resource efficiency, biodiversity conservation, renewable energy, waste reduction, social fairness, and responsible consumerism are all included in sustainability.
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3 Below, someone is trying to balance a plank with stones. The plank has negligible weight. a Calculate the moment of the 4 N force about O. b Calculate the moment of the 6 N force about O. - 2 m * 2 m-* 4 m Р 1 4N 6N
Answers
Answer:
Moment of the 4N force = 16Nm
Moment of the 6N force = 12Nm
Explanation:
Find the diagram attached.
Moment of a force is the product of the force and the perpendicular distance from the point of application
For the 4N force
Distance of the force from O is 4m
Moment of the 4N force = 4N * 4m
Moment of the 4N force = 16Nm
For the 6N force
Distance of the force from O is 2m
Moment of the 6N force = 6N * 2m
Moment of the 6N force = 12Nm
the weight of a girl with the mass of 40.0kg is ?
Answers
Answer:
392 Newtons
Explanation:
In order to find the weight, you have to multiply the mass by the gravitation constant (9.8), which gives us 40.0 * 9.8 = 392 Newtons.
Which of the following statements about the lithosphere is NOT true?
A. The lithosphere is the coolest and most rigid part of the Earth.
B. The lithosphere is the solid, outer part of the Earth.
C. The lithosphere includes the brittle upper portion of the mantle and the crust
D. The lithosphere is far more ductile than the asthenosphere.
Answers
The statement about the lithosphere is not true is option (D) The lithosphere is far more ductile than the asthenosphere.
The lithosphere is the solid, outermost shell of the Earth that includes the crust and the uppermost portion of the mantle. It is composed of a variety of rock types and is divided into a number of tectonic plates that move and interact with each other.
The lithosphere is actually less ductile and more rigid than the underlying asthenosphere. The lithosphere is composed of the brittle uppermost portion of the mantle and the crust, and it is broken up into tectonic plates that move and interact with each other. The lithosphere is also relatively cool compared to the underlying asthenosphere, which is partially molten and more ductile.
Therefore, the correct option is option (D) The lithosphere is far more ductile than the asthenosphere.
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if a wave train (group of swell) in the open ocean has an average wavelength (l) of approximately 140 meters and a period (t) of 10 seconds, what is the celerity of these waves?
Answers
The celerity of a wave train (group of swell) in the open ocean is 14 meter per second.
oceanography :
The study of all aspects of the ocean is known as oceanography. Oceanography includes a wide range of topics, including marine life and ecosystems, currents and waves, sediment movement, and seafloor geology.average wavelength of open ocean, l = 140 meters
time period, t = 10 seconds
speed of the train is calculated as :
140/10 = 14m/s
speed of train = 14m/s
The celerity of a wave train (group of swell) in the open ocean is 14 meter per second.
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Question 1 of 10
During an experiment, you take a measurement of 18.3 inches. What is this
measurement in centimeters? 1 in = 2.54 cm.
Answers
Answer:
\(46.482 cm\)
Explanation:
\(Since 1 in = 2.54cm\\\\18.3 inches =(18.3 x 2.54) cm\\ =46.482cm\)
Anna said that she is faster than Jay because she can run 1 km in 0.1 hours Jay says he can run faster than Anna because he can run 1/4 of a kilometer and 0.05 hours who is correct, if anybody?
Answers
Answer: Jay
Explanation:
1 km in .1 hours is the same as 1 km in 6 minutes
1/4 km in .05 hours is the same as 1/4 km in 3 minutes or 1 km in 12 minutes
If a statue is made out of wood, which of these words correctly describes the statue?
OA.
wooded
ОВ.
woody
OC.
non-wood
OD.
wooden
Answers
Answer:
Od- Wooden
Explanation:
It would not make sense if it was non-wood because that make it no a wood base product, OC is not right because its not a a plant that produces wood as its structural tissue and thus has a hard stem. An OA justT o take or get a supply of wood. so its Od
Solve the science problem
Answers
When light hits a surface it usually bounces off at a larger angle. True or false? Justify
Answers
Answer:That only applies to highly polished surfaces, eg mirrors.
If you take a high quality laser (ie with low divergence) and aim it at a wall, you can see the spot where the laser beam reaches the wall from anywhere with a direct line-of-sight to the spot where the laser beam reaches the wall. This due to micro imperfections on the surface of the wall. At a microscopic level, the wall surface is very rough and pointing in all directions.
As to why, a beam of light bounces of a highly polished surface, I can only surmise that it is essentially due to kinematics, ie the only force opposing the light beam is normal to the surface, hence there no forces along the reflective surface. Since there are no forces along the reflective surface, the speed component of light along the reflective surface remains unchanged. However, on the plane perpendicular to the reflective surface the, the light photons bounce off at the same speed at which the hit the reflective surface because the mass of the reflective surface is much much much larger than the mass of the photons, which means that the reflective surface won’t move at all. Since conservation of momentum requires that momentum after the collision be the same as the momentum before the collision then the only way for that to happen is if the velocity of the photon perpendicular to the reflective surface is of exactly the same magnitude but in the opposite direction. Vector resolution of the speed component of the reflected beam means that the angle of reflection must be the same as the angle of incidence.
Explanation:
a ball is floating at equilibrium in water, and exactly half of the ball is in the water. oil is slightly less dense than water. if you float the ball at equilibrium in oil,
Answers
If you float the ball at equilibrium in oil, the ball will have more than half of its volume submerged in the oil.
When an object floats, it moves the same volume of fluid as the object itself weighs. The displaced fluid exerts an upward buoyant force on the object, balancing its weight and allowing it to float at equilibrium.
Since oil is less dense than water, it provides less buoyant force per unit volume compared to water. To achieve equilibrium in oil, the ball would need to displace a greater volume of oil to counteract its weight. As a result, more than half of the ball's volume would need to be submerged in the oil for it to float at equilibrium.
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Complete question:
A ball is floating at equilibrium in water, and exactly half of the ball is in the water. oil is slightly less dense than water. if you float the ball at equilibrium in oil, the ball would have ______
When a car is coasting downhill, how are its potential and kinetic energies changing?
Answers
When a car is coasting downhill, the kinetic and potential energies are increasing and decreasing respectively.
What are kinetic and potential energy?Kinetic energy is the energy possessed by an object because of its motion, equal to one half the mass of the body times the square of its speed.
Potential energy, on the other hand, is the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass).
According to this question, a car going downhill will begin to speed because there is lesser friction. This suggests that the kinetic energy increases while the potential energy decreases.
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consider the combination of capacitors shown in the diagram, where c1c1c_1 = 3.00 μfμf , c2c2c_2 = 11.0 μfμf , c3c3c_3 = 3.00 μfμf , and c4c4c_4 = 5.00 μfμf .
Answers
Using the given values of capacitors, the equivalent capacitance of the combination is 6.0 μF, when c2 and c3 are in parallel, and c1-c4 combination is in series.
The combination of capacitors can be simplified by first calculating the equivalent capacitance (C23) of capacitors c2 and c3, which are in parallel. The equivalent capacitance (C23) can be found using the formula for capacitance in parallel connection:
1/C23 = 1/c2 + 1/c3
Substituting the given values, we get:
1/C23 = 1/11 μF + 1/3 μF
1/C23 = (3 + 11)/(11 × 3) μF
1/C23 = 14/33 μF
C23 = (33/14) μF
Using this equivalent capacitance value, we can now calculate the equivalent capacitance (C) of the entire combination, which consists of capacitors c1, C23, and c4 in series. The equivalent capacitance (C) can be found using the formula for capacitance in series connection:
C = c1 + C23 + c4
Substituting the given values, we get:
C = 3 μF + (33/14) μF + 5 μF
C = (42/14) μF + (33/14) μF + (70/14) μF
C = (145/14) μF
C ≈ 10.36 μF
Therefore, the equivalent capacitance of the combination is 10.36 μF, which is approximately 6.0 μF.
In conclusion, we have calculated the equivalent capacitance of the given combination of capacitors using the formulae for capacitance in parallel and series connections. The equivalent capacitance is 6.0 μF, when c2 and c3 are in parallel and c1-c4 combination is in series.
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The input preure on a hydraulic lift i 1200 Pa. If the output force on the other ide i 800 N, what i the output urface area?
Answers
A hydraulic lift's input pressure is 1200 Pa. If the output force on the other side is 800 N, the output surface area is 0.67m^2
Given the input pressure (P1) = 1200Pa
Output force (F2) = 800N
We know that P= F/A where A is area of cross section
Let the input force be F1 and area is A1
Then by pascals law we say that:
F1/A1 = F2/A2
1200 = 800/A2 (since P1= F1/A1)
A2 = 8/12 = 0.67m^2
Hence the area of other side = 0.67m^2
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Alisa, a skateboarder, is riding down a hill. If Alisa and the skateboard are considered a single object, what forces are acting on her? Check all that apply.
Answers
Answer: gravity
normal force
friction
Explanation:
A force is refered to as the interaction which when unopposed, will lead to a change in an objects motion. The velocity of an object will be changed when force is applied.
Since Alisa s riding down a hill and she and the skateboard are considered to be a single object, then the forces that are acting on her include gravity, normal force and friction.