a disk with a radius of 1.20 cm rolls in a straight line across a flat, horizontal surface. if the disk has an initial angular speed of 18.0 rad/s and slows at a rate of 1.90 rad/s2, how far does it roll before coming to rest? (assume there is no slipping and it does not tip over).
Answers
A disk with a radius of 1.20 cm rolls in a straight line across a flat, horizontal surface. If the disk has an initial angular speed of 18.0 rad/s and slows at a rate of 1.90 rad/s2 and the disc comes to rest after covering 1.023 m.
What is angular velocity?
Angular velocity can be defined as the time rate at which an object will rotates and if it revolves, about an axis in which the angular displacement between two bodies changes.
To find the displacement,
Initial angular speed, wo = 18 rad/s
final angular speed, w = 0 rad/s
angular acceleration, = 1.9 rad/s²
radius, r = 1.2 cm = 0.012 m
initial linear velocity, u = r wo
= 0.012 x 18 = 0.216 m/s
final linear speed, v = r w
= 0.012 x 0 = 0 m/s
linear acceleration, a = r x angular acceleration
= 0.012 x 1.9 = 0.0228 m/s2
Let the distance traveled is s.
Using third equation of motion
V² = U²+2as
0 =0.216²+2×0.0228×s
s = 1.023m
The disc comes to rest after covering 1.023 m.
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Related Questions
what is lever and explain its working principle
Answers
The lever is a simple machine that changes the magnitude and direction of the force applied to move an object. It minimizes the effort required to lift the object. A lever is a rigid bar which moves around a supporting point (pivot or fulcrum). The object to be lifted is placed on the bar.
five words that comes to your mind whenever you hear the word energy
Answers
Answer: power, renewable, extinct, solar, wind
Would appreciate brainliest <3
Answer:
chemical
mechanical
electrical
nuclear
thermal
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a thick copper wire connected to a voltmeter surrounds a region of time-varying magnetic flux, and the voltmeter reads 7 volts. if instead of a single wire we use a coil of thick copper wire containing 24 turns, what does the voltmeter read?
Answers
When using a coil of thick copper wire containing 24 turns, the voltmeter would read 168 volts
To determine the new voltmeter reading when using a coil with multiple turns, we'll use Faraday's Law of Electromagnetic Induction. Faraday's Law states that the induced electromotive force (EMF) in a closed loop is equal to the negative rate of change of magnetic flux through the loop. The formula for Faraday's Law is:
EMF = -N * (ΔΦ/Δt)
where EMF is the induced electromotive force, N is the number of turns in the coil, ΔΦ is the change in magnetic flux, and Δt is the change in time.
Since we know the initial voltmeter reading with a single wire (7 volts), we can use this information to determine the change in magnetic flux (ΔΦ/Δt) for the single wire:
7 volts = -1 * (ΔΦ/Δt)
Now, we can find the induced EMF for the coil with 24 turns:
EMF = -24 * (ΔΦ/Δt)
We already know the value of ΔΦ/Δt from the single wire, which is -7. So we can plug that value into our formula:
EMF = -24 * (-7)
EMF = 168 volts
Therefore, when using a coil of thick copper wire containing 24 turns, the voltmeter would read 168 volts.
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when resistors are wired in series what must be the same for the two resistors? when resistors are wired in series what must be the same for the two resistors? their resistance the potential difference across them the energy used by them the current flowing through them
Answers
In a series circuit, the output current of the first resistor flows into the input of the second resistor, resulting in the same current in both resistors.
What happens when you connect two resistors in series?The current through each resistor is the same when resistors are linked in series. In other words, the current in a series circuit is the same at all locations.
The voltage across each resistor must be the same. The average of the individual resistances in the circuit is the equivalent resistance for the resistors in the circuit. The voltage across each resistor must be the same. Two resistors can be connected in series or parallel to a battery.
Two or more capacitors connected in series will have the same quantity of coulomb.
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A non -viscous incompressible fluid is pumped steadily into the narrow end of a long tapered pipe and emerges from the wide end . The pressure at the input is greater than at the output . A possible explanation is :
Answers
Answer:
v₂ =\(( \frac{r_1}{r_2})^2 \ v_1\)
Explanation:
This phenomenon is explained by the continuity equation in fluids
v₁A₁ = v₂A₂
where the subscript 1 is for the input narrow part and the subscript 2 for the wide part
v₂ = \(\frac{A_1}{A_2} v_1\)
consider the cross section at each point
A₁ = π r₁²
A₂ = π r₂²
we substitute
v₂ =\(( \frac{r_1}{r_2})^2 \ v_1\)
therefore the exit velocity is less than the entrance velocity of the fluid.
We can also analyze the situation using Bernoulli's equation
P₁ + ρ g v₁² + ρ g y₁ = P₂ + ρ g v₂² + ρ g y²
if we assume a horizontal system y₁ = y₂
P₁-P₂ = ρ g (v₂² - v₁²)
a tennis ball is thrown straight up with an initial velocity of 22.5 m/s how much total time is the ball in the air
Answers
Answer:
4.6s
Explanation:
v=u+at
0=22.5+(-9.8)t
-22.5=-9.8t
t=-22.5/-9.8
t=2.295 s
The total time will double
2.295×2=4.59s
=4.6s
If Saturn takes about 30 years to orbit the Sun, and its rings were seen edge-on in 2009, when will they appear edge-on next?
Select one:
a. 2015
b. 2024
c. 2039
d. 2012
e. 2019
Answers
Answer:
b the answer
Explanation:
It is correct
As a general rule, women __________.
A. are more flexible than men
B. are less flexible than men
C. are as flexible than men
D. are flexible in different ways than men
Answers
Answer:
a
Explanation:
Type the correct answer in each box. Use the profit equation to compute the profit at each of the vertices. At (0,55), the profit is $. At (0,15), the profit is $. At (10,0), the profit is $. At (55,0), the profit is $
Answers
To compute the profit at each vertex, we need to use the profit equation. The profits at the given vertices are as follows: at (0, 55), the profit is $; at (0, 15), the profit is $; at (10, 0), the profit is $; at (55, 0), the profit is $.
To calculate the profit at each vertex, we need the profit equation. However, the provided equation is missing, so we are unable to compute the profits directly. The profit equation typically involves variables such as revenue, cost, and quantity sold. Without the specific equation, it is not possible to determine the profits at each vertex.
To solve this question accurately, please provide the profit equation or any additional information required to calculate the profits at the given vertices. Once we have the necessary equation, we can substitute the corresponding values from each vertex and calculate the respective profits.
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Profit at vertex (0, 55) = $55
Profit at vertex (0, 15) = $15
Profit at vertex (10, 0) = $35
Profit at vertex (55, 0) = $0
To solve the given problem, we'll use the profit equation formula, i.e., profit = Revenue − Cost. Plotting the given vertices on a graph as shown below:
Graph:
[asy]
import graph;
size(150);
defaultpen(linewidth(0.7));
draw((0,-15)--(0,65), EndArrow(6));
draw((-15,0)--(65,0), EndArrow(6));
real f(real x) {return (55-x);}
real g(real x) {return (3x+15);}
real h(real x) {return 0;}
draw(graph(f, 0, 55),red);
draw(graph(g, 0, 15),red);
draw(graph(h, 0, 55),red);
draw(graph(h, 0, 10),red);
label("$P$", (0, 65), N);
label("$Q$", (65, 0), E);
label("$A$", (0, 15), W);
label("$B$", (10, 0), S);
label("$C$", (55, 0), S);
label("$D$", (0, 55), W);
draw((0,55)--(0,15), blue);
draw((0,15)--(10,0), blue);
draw((10,0)--(55,0), blue);
label("$55$", (0, 55/2), W);
label("$15$", (0, 15/2), W);
label("$10$", (10/2, 0), S);
label("$55$", (55/2, 0), S);
[/asy]
Using the profit equation formula, i.e., profit = Revenue − Cost, we will calculate the profit at each vertex given below:
a) At vertex (0,55)
Revenue, R = 55
Cost, C = 0
Profit, P = R - C = $55
b) At vertex (0,15)
Revenue, R = 15
Cost, C = 0
Profit, P = R - C = $15
c) At vertex (10,0)
Revenue, R = 3(10) + 15 = $45
Cost, C = 10
Profit, P = R - C = $35
d) At vertex (55,0)
Revenue, R = 55
Cost, C = 55
Profit, P = R - C = $0'
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calculate the wavelength (in nm)of the red light emitted by a neon sign with a frequency of 4.76
Answers
The wavelength of the red light emitted by the neon sign is approximately 6.30 x 10¹⁶ nm.
To calculate the wavelength of the red light emitted by a neon sign with a frequency of 4.76 Hz, we will use the speed of light formula:
Speed of light (c) = Wavelength (λ) × Frequency (f)
First, convert the speed of light to nm/s: c = 3.00 x 10^8 m/s = 3.00 x 10¹⁷ nm/s.
Next, rearrange the formula to find the wavelength: Wavelength (λ) = Speed of light (c) / Frequency (f)
Substitute the given frequency and speed of light values:
λ = (3.00 x 10¹⁷ nm/s) / (4.76 Hz)
λ ≈ 6.30 x 10¹⁶nm
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Una ave vuela a una velocidad constante de 15m/s en una trayectoria rectilínea. Si dura una hora volando ¿cuanta distancia habrá recorrido?
Answers
Answer:
54,000
Explanation:
Which of these is not method of preventing the corrosion of metals?
A. galvanising
B. painting
C. plating
D. rusting
Answers
Answer:
D. rusting is answer....
The box is being pushed to the right with a force of 300 newtons, and to the left with a force of 400 newtons. What is the magnitude of the net force on the box?.
Answers
pushed to the right = 300 newtons
pushed to the left = 400 newtons
\(400-300=100\)
\(\fbox{100 Newtons to the left}\)
A heat pump is used to heat a building. The external temperature is lower than the internal temperature. The pump's coefficient of performance is 3.30, and the heat pump delivers 7.85 MJ as heat to the building each hour. If the heat pump is a Carnot engine working in reverse, at what rate must work be done to run it
Answers
Work must be done at a rate of approximately 2.38 × 10^6 joules per hour to run the Carnot heat pump in reverse.
To determine the rate at which work must be done to run the Carnot heat pump in reverse, we can use the formula for the coefficient of performance (COP) of a Carnot engine in reverse:
COP_reverse = (Q_hot / W)
Where:
COP_reverse is the coefficient of performance of the Carnot heat pump in reverse,
Q_hot is the amount of heat delivered to the building (7.85 MJ per hour in this case),
W is the rate at which work is done.
Rearranging the formula, we can solve for W:
W = Q_hot / COP_reverse
Substituting the given values:
W = 7.85 MJ / 3.30
Converting megajoules (MJ) to joules (J):
W = 7.85 × 10^6 J / 3.30
Calculating the value:
W ≈ 2.38 × 10^6 J
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a baby carriage is sitting on the top of a hill that is 21 m high. the carriage with a baby 75kg. the carriage has what energy? calculate it
Answers
Answer:
It has potential energy
PE = 15450.75 J
Explanation:
we know its potential energy because the carriage is not moving, although it can
PE = mgh
in this case, m is 75, h is 21, and g is always 9.81
plug these in: PE = (75) (21) (9.81)
your answer: PE = 15450.75 J
10 Psychological Tricks That Can Make Your Life Much Easier
1. Look into someone’s eyes when you get a dissatisfactory answer: Sometimes we don’t like the answer to a question that we receive and sometimes we don’t understand it. Instead of repeating the question or asking another, look into the eyes of the person. This will make the person feel under pressure or cornered, and this will force them to further elaborate their thoughts.
2. Stay calm when someone raises their voice to you: Make a strong effort to remain calm. When a loudmouth acts out it’s usually in anger, and our behaviors can sometimes unintentionally provoke that. The feelings of anger usually quickly subside and guilt will set in and usually this person is first to ask for forgiveness.
3. Sit close to the aggressor to avoid attack: If you’re heading into a meeting and you know you’ll be in the room with an aggressive person, you know the discussion may become heated, or you may be subjected to negative criticism, make a point to sit next to that person. You may feel uncomfortable and awkward, but you won’t be the only one. Close proximity is known to make people uncomfortable which will lessen the level of aggression they plan to exercise.
4. Remember everyone’s names if you want to be popular: If you want to be popular with your peers and colleagues, make it a habit to start calling people by their first names when speaking with them. A person feels instantaneously special when you call him or her by their first name.
5. Write down your thoughts when you feel stressed or anxious: We all feel some level of mental stress or anxiety at some point. Write down your thoughts in a journal and then close it up. Believe it or not, you’ll be able to focus on your work more easily because you have now shared your thoughts with someone. When you share them, you will then feel the burden on your mind reduced.
6. Give yourself fewer choices when you can’t make the decision:Some people believe that it’s better to have more choices and more information and actually, they prefer to have more. However, it is actually paralyzing to have too many. There is evidence that shows that having four options at a time is the maximum number we can consider and still make a choice. In order to be an effective decision maker, you should only give yourself a few options at a time. This will allow you time to consider each one while giving you enough space between looking at a new set of options.
7. Right posture can boost confidence: This psychological trick applies to both work and pleasure. It can drastically improve your dating life and help you move up the ladder at work. How can you become confident do you ask? The best way to do this is through your posture. If you allow yourself to take up more space, you’re more likely to feel more confident. This is referred to power language.
8. Surefire way to win in ‘rock, paper, scissors’: This one is definitely intriguing. When you’re about to play this famous game, ask your opponent a random question right before. This typically will throw your confused opponent off and more often than not they will throw up ‘scissors’.
9. Make people feel needed when you ask for help: If you need someone’s help start off with the phrase, ‘I need your help…’ People like to feel needed and they hate feeling guilty. By starting off the conversation with that phrase, you’re more likely to receive the help you need.
10. Warm your hands before shaking hands with others:Did you know that cold hands are linked to distrust? When you’re about to touch someone or shake their hand, make sure that your hands are warm. Warm hands promote a friendly atmosphere.
and those are the ten physiology tricks.
Answers
Answer: Cool! Thanks!
Select the correct answer. Why does a solid change to liquid when heat is added? A. The spacing between particles decreases. B. Particles lose energy. C. The spacing between particles increases. D. The temperature decreases.
Answers
Answer:
The right answer is c because when we heat solid object the molecule will start lose attraction on object
Explanation:
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in terms of radio wave signals, which term describes the impact of thick walls and ceilings?
Answers
The term that describes the impact of thick walls and ceilings on radio wave signals is attenuation. Attenuation refers to the loss of signal strength or energy as it travels through a medium, such as a wall or ceiling.
The thicker the material, the higher the level of attenuation, resulting in weaker radio wave signals on the other side of the barrier.
Attenuation refers to the reduction in the strength or intensity of a signal as it travels through a medium or encounters obstacles. In the context of radio wave signals, thick walls and ceilings can act as barriers or obstacles that obstruct the transmission of radio waves. As radio waves encounter these physical barriers, they can be absorbed, reflected, or refracted, leading to a decrease in signal strength.
Thick walls and ceilings tend to be denser and more opaque to radio waves compared to open spaces or thinner materials. This increased density and opacity result in greater attenuation of the radio waves passing through them. The higher the attenuation, the weaker the signal becomes after passing through the barriers.
The extent of attenuation depends on factors such as the thickness and composition of the walls and ceilings, the frequency of the radio waves, and the distance between the transmitter and receiver. In some cases, the attenuation caused by thick walls and ceilings may require the use of additional signal amplification or the installation of repeaters or signal boosters to maintain an adequate signal strength.
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A car crosses the start line with an initial velocity of 7 m/s. After 12 seconds, the car reaches a position of 105 m. From this information, which best describes its motion?
Group of answer choices
It speeds up and then slows down.
It is moving with a negative acceleration.
It is moving with a constant velocity.
It is moving with a positive acceleration.
Answers
Describe the movement of air masses and the weather conditions at front 3. What type of front is it?
Answers
Answer:
Cold Front. A side view of a cold front (A, top) and how it is represented on a weather map (B, bottom).
Warm Front. ...
Stationary Front. ...
Occluded Front.
Answer:
Front 3 is an occluded front. A cold air mass moves toward warmer air. The colder, heavier air pushes the warm air upward until it’s wedged between two cold air masses. Clouds can form from the lifting of the warm air.
Explanation:PLATO
Determine the mass of a boat that is propelled forward by a force of 1250N at an acceleration of 3 m/s2.
Answers
Answer:
416.6 KG
Explanation:
Due to the mass being missing from the equation you divide the force by the acceleration
What group is Ne in? What is its period?
Answers
Answer:
Neon (Ne), chemical element, inert gas of Group 18 (noble gases) of the periodic table, used in electric signs and fluorescent lamps. Colourless, odourless, tasteless, and lighter than air, neon gas occurs in minute quantities in Earth's atmosphere and trapped within the rocks of Earth's crust.
Explanation:
I am smart
Answer:
It is a Noble gas and its group is 18 or 8a and its period is 2.
Explanation:
the reason behind my answer is group is the column and the period is the row.
the fact that quasars can be detected from distances from which even the biggest and most luminous galaxies cannot be seen means that
Answers
The detection of quasars from such great distances is due to their extreme luminosity and the fact that they emit massive amounts of energy.
Quasars are the most energetic objects in the universe, and their bright emissions make them visible even at very large distances. On the other hand, even the biggest and most luminous galaxies cannot be seen from such distances because their emissions are not as powerful as those of quasars.
Quasars are actually supermassive black holes at the center of galaxies that are actively feeding on surrounding matter. As they consume matter, they emit large amounts of energy in the form of light, X-rays, and other types of radiation. This energy is what makes them visible from great distances, even beyond the limits of what other galaxies can achieve.
The fact that quasars can be detected from distances beyond the reach of other galaxies is a testament to their extreme power and luminosity. It also helps astronomers to study the universe at a deeper level and gain insight into the evolution of galaxies and supermassive black holes.
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How long will it take to travel 150km at an average speed of 40 km/h
Answers
Answer:
6,000 minutes
Explanation:
To calculate distance u multiply speed and time or speed and rate
How do you measure the strength of a magnet?
Answers
Measurements of magnet strength can be made in a variety of ways, depending on which is most practical for a given application. Here are a few popular units for measuring magnet strength.
Different methods to measure strength of magnet?1. Tesla
The unit of magnetic force denoted by the letter T is called a tesla. It describes the residual flux density, or the density of a magnetic field.
There are numerous methods to define a tesla in terms of other scientific units of measurement. For instance:
T = kg / (A * s2)
2. Gauss
A magnet is frequently made magnetic by the application of an external magnetic force. The magnetic force that remains in the magnet after the removal of the external force is referred to as remanence.
3. Oersted
Oersteds (Oe), are units used to quantify resistance to demagnetization or coercivity.
4. kilograms
Magnet pull strength is measured in kilograms in terms of magnetism.
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another dog runs up beside the first dog and starts barking at the same sound intensity level. what sound intensity level in decibels do you hear from the two dogs barking?
Answers
When another dog runs up beside the first dog and starts barking at the same sound intensity level, the sound intensity level in decibels that is observed by both dogs is approximately 153db
What is sound intensity?The force carried by acoustic energy per unit area in a direction perpendicular to that region is described as sound intensity, also known as acoustic intensity. The watt per square meter is the SI measure of intensity, which includes sound intensity.
To get the above result,
We are given that The Sound Intensity Level (Li) of a single dog is Li = 98 dB.
To get the required value of the intensity, we state the formula for sound intensity:
Level of Intensity (Li) = 10Log₁₀ β/I₀
Where
β = Sound intensity and
I₀ = Reference Intensity (or standard intensity value) which is given as 10⁻¹².
Note that in measuring sound intensity, there are various reference points. They are given as follows:
0 dB, I = 1×10⁻¹² ⇒ Threshold of human hearing
10 dB, I = 1×10⁻¹¹ ⇒ Rustle of leaves
60 dB, I = 1×10⁻⁶ ⇒ Normal conversation
100 dB, I = 1×10⁻² ⇒ Loud siren
Since the intensity of both dogs is equal, the resultant sound intensity, therefore:
Li = 10log10 (βᵃ/I₀ + βᵇ/I₀)
Where βᵃ is the sound intensity of the first dog (98db); and
βᵇ is the sound intensity of the second dog. (98db)
Li = 10log (10 98/10⁻¹² + 10 98/10⁻¹²)
Li = 10(Log(10(98/1/1000000000000) + 10(Log(10(98/1/1000000000000)
Li = 10(log(980000000000000+980000000000000))
Li = 10(log(1960000000000000))
Li = (10)(15.292256)
Li = 152.922561
Hence the sound intensity (Li) of the two dogs barking is:
Li \(\approx\) 153db
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Full Question:
A single dog barks at a sound intensity level of β = 98 dB.
Another dog runs up beside the first dog and starts barking at the same sound intensity level. What sound intensity level in dB do you hear from the two dogs barking?
suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is in existence now. given this, how many civilizations are in existence now?
Answers
Only one civilization is in existence now. The human civilization that is present on the earth is the civilization that exists in this period of time. It can also exist in the coming future for several centuries.
Earth is the only planet where intelligent civilization can exist. Atmospheric conditions are also not so suitable for life to exist on planets other than earth. The other habitable planets in the galaxies have conditions that can help to persist life. The availability of water and oxygen on the planets gives a trace of a complete package of materials that makes life possible on other planets.
Some of the technological advancements such as building a spacecraft and placing a satellite in space are the areas of searching of life on other planets.
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¿Qué trabajo realiza una carreta que contiene una de masa 800 lb de cemento si se desplaza 100 m por un suelo nivelado?
Answers
Answer:
Ver respuesta en el procedimiento
Explanation:
En este caso, necesitamos la expresión que nos permite hallar el Trabajo realizado por un objeto a través de una distancia dada. Esa expresión es:
W = F * x (1)
Donde:
W: Trabajo en Joules (J)
F: Fuerza en Newton (N)
x: Distancia o radio en metros (m)
En este caso, solo tenemos una masa de 800 lb, y la distancia que se esta recorriendo. No tenemos ningún dato adicional que nos diga si por ejemplo, es empujado por una persona o parecido, solo los datos de la masa que lleva la carreta. Por lo tanto, la única fuerza que podemos asumir se está ejerciendo, sería la fuerza del peso del objeto que se calcula así:
P = mg (2)
Donde:
g: aceleración de gravedad (9,8 m/s²)
Ahora bien si reemplazamos (2) en (1) nos queda:
W = mgx (3)
Y antes de realizar el cálculo debemos convertir la unidad de masa en libra a kilogramo, usando la siguiente conversión: 1 lb -----> 0,454 kg por tanto:
m = 800 * 0,454 = 363.2 kg
Ahora podemos usar (3) y calcular el trabajo:
W = 363,2 * 9,8 * 100
W = 355936 J o simplemente 355,936 kJ
Espero te sirva.
PD: También puedes usar el valor de gravedad como 10 m/s² y tendrás un resultado de 363200 J o 363,2 kJ.
Which of the following is a property of a transverse wave?
A. It needs a medium to travel.
B. It travels up and down.
C. They are visible to the nake eye.
D. It travels by compressing particles.
Answers
The correct answer is option B. It travels up and down. Transverse waves are characterized by the fact that they cause particles in the medium to move perpendicular to the direction of wave propagation.
What are transverse waves?Transverse waves are a type of wave that causes the particles of the medium to move up and down or side to side as the wave passes through them.
The other options are not right because:
Option A: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves do need a medium to travel, whereas transverse waves can travel through a vacuum, such as light waves.Option C: It is not necessarily true that transverse waves are visible to the unaided eye. Some transverse waves, such as light waves, are visible, but others, such as radio waves, are not.Option D: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves travel by compressing particles, whereas transverse waves travel by perpendicular vibrations.Learn more about transverse waves here:
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Give an example of a positively charged object