What is Roll: Definition and 179 Discussions

Rock and roll (often written as rock & roll, rock 'n' roll, or rock 'n roll) is a genre of popular music that evolved in the United States during the late 1940s and early 1950s. It originated from Black American music such as gospel, jump blues, jazz, boogie woogie, rhythm and blues, and country music. While rock and roll's formative elements can be heard in blues records from the 1920s and in country records of the 1930s, the genre did not acquire its name until 1954.According to journalist Greg Kot, "rock and roll" refers to a style of popular music originating in the United States in the 1950s. By the mid-1960s, rock and roll had developed into "the more encompassing international style known as rock music, though the latter also continued to be known in many circles as rock and roll." For the purpose of differentiation, this article deals with the first definition.
In the earliest rock and roll styles, either the piano or saxophone was typically the lead instrument. These instruments were generally replaced or supplemented by guitar in the middle to late 1950s. The beat is essentially a dance rhythm with an accentuated backbeat, almost always provided by a snare drum. Classic rock and roll is usually played with one or two electric guitars (one lead, one rhythm) and a double bass (string bass). After the mid-1950s, electric bass guitars and drum kits became popular in classic rock.Rock and roll had a polarizing influence on lifestyles, fashion, attitudes, and language. It is often depicted in movies, fan magazines, and on television. Rock and roll may have contributed to the civil rights movement because both African American and White American teenagers enjoyed the music.

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  1. B

    Automotive Dirt micro sprint car -- two different roll centers from front to rear?

    Hello everyone! New here to this forum! My question is...I race a 600 micro sprint here on the east coast. My car has a front and rear panhard bar. The frame mount for the rear is located on the outside of the right frame rail. The frame mount for the front is located on the inside of the...
  2. R

    How torque and friction cause wheel to roll

    I apologize if this question has been answered before, but I did not find the explanation that I needed. If a torque is applied to a wheel situated on a frictional surface, what forces cause the wheel to roll? I know that if P is the contact point, the static frictional force counteracts...
  3. A

    Wing Anhedral and effect on roll stability and control

    Many fighter aircraft have anhedral on their wings - F-104, Dassault Mirage III. What is the effect on control - is it neutral roll stability through 360 and more important, what is the effect on stability - is there a 'notch' effect if there is no dihedral where the aircraft tends to assume...
  4. N

    Sliding time before a ball begins to roll on a horizontal surface

    Homework Statement A ball is released along a horizontal surface with a co-efficient of friction Us at a speed V. Find the time it takes for the ball to start rolling (leave the moment of inertia as I). Homework Equations Quite a few, all of them are stated in my working (that I...
  5. L

    MHB Roll the Die: Win \$10 or Lose \$2?

    someone help me understand these questions please: 1) Would you pay \$ 2 to play this game? if you throw a one on a balanced die, you receive \$10, otherwise you lose you \$2. a) what are the two possibilities for this game? b) what are the corresponding probabilities associated with these...
  6. A

    Yaw,Pitch and Roll Multiplication

    If I have (α1,β1,γ1) and (α2,β2,γ2) as two set of rotation angles in radians.Where α is Yaw of α about z axis, β is pitch about y-axis and γ is roll about x axis. My question is when I multiply the two rotation sets what would be the result? Would it be simple addition of angles if I extract the...
  7. W

    Automotive How to calculate body roll on a car as a torque?

    When a car turns there is a centripetal force acting at the tyres to get it round the bend. There is also an acceleration of the chassis away from the bend acting at the centre of gravity. These combine to create a torque which causes the chassis to roll about the roll centre. Is this correct...
  8. N

    Engineer a precision positioning setup for a paper on a roll

    There are several parts to this effort. Bond paper roll being stretched between 2 paper feeders on wheel bearings Precision positioning of the roll to a coordinate system devised for that roll That is if the paper roll is 35 meters long or 35'000 mm and 914.4mm wide I could choose a point on...
  9. A

    Geometry: why yaw, pitch, roll in that order?

    It is basically a question in computer graphics but I guess math sub-forum will suit this question. While rotating a point, why we first apply yaw, then pitch and then roll in that order? Of course if we change the order, final rotation changes but why this specific order works? Some proof or...
  10. S

    Finding the Normal Force on the Rod of a Paper Roll

    Homework Statement A large 16.0 kg roll of paper with radius R=18.0 cm rests against the wall and is held in place by a bracket attached to a rod through the center of the roll. The rod turns without friction in the bracket, and the moment of inertia of the paper and rod about the axis is...
  11. A

    Slow roll inflation -layperson question

    Dear PF, I'm trying to understand slow roll inflation from a layperson view, and I think my current understanding is mistaken. If a bubble of matter is trapped in a local minimum PE state, and begins to roll down a hill to a lower PE state, it strikes me that bubble will expand in size the...
  12. B

    What is the role of roll damping coefficient in aircraft performance?

    Hello, I am new to Aerodynamics and am having trouble understanding what exactly the roll damping derivative is. The roll damping derivative is a measure of the change in rolling moment coefficient with respect to nondimensional roll rate and is usually negative. Does that mean a glider...
  13. N

    Calculated Pitch, Yaw, Roll of vectors in a plane

    Hello, I'm sorry if this is a dumb question but I am extremely confused and could use some guidance. So consider a cartesian coordinate system with a plane which passes through the origin, and there are vectors of known X,Y,Z components which lie within this plane. The plane(and vectors) are...
  14. A

    Designing a Roll Cage for an Electric Car

    I am a bachelors mechanical engineering student with a decent factual knowledge about cars and how they work. But i am a novice with no experience when it comes to design. Now I (along with 3 other guys) have been assigned the task of designing the roll cage of an electric car. I did not get any...
  15. E

    How much further does a ring roll up a hill

    Homework Statement http://puu.sh/5nLnI.png Homework Equations I = mr2 The Attempt at a Solution Moment of inertia: Mass density = mass / area = 2.59 / (π*9.52 - π*7.52) = 0.02424772368 kg / cm2I = (areaA)(density)(radiusA) - (areaB)(density)(radiusB) =...
  16. F

    Can a ball roll fast enough that it becomes airbourne while rolling?

    For ex, say you were rolling a ball down a steep ramp (about 85-90 degrees to horizontal, so almost straight). The ramp is say at least 100m long so there's enough time for the ball to build up velocity, etc. Is it possible for any circumstances to happen where the ball would temporarily...
  17. D

    Barrel roll with/without slipping

    Hi guys, I'm wondering if I roll a barrel which rolls without slipping down an inclined plane vs. a barrel which only slips down the plane - who will get down faster and how can I show it mathematically ? Thanks
  18. K

    Do Front and Rear Axles Roll Differently in Independent Suspension Systems?

    I have done a fair bit of mathematical and 3D modelling of independent automotive suspension systems, and have come to the conclusion that the in pure steady state cornering no matter what the combination of springs, ARB/sway bars, motion ratios or linkage geometry, the roll angle (ignoring the...
  19. schrodingerscat11

    How will objects roll in the absence of friction?

    I am just wondering (out of curiosity) these past few days what would happen if an object rolls on a frictionless surface. I was thinking if a spherical object is on a free space and is subjected to some force field, I think it would just move laterally to the direction of the field and...
  20. DHF

    This is how Atlantic wire scientific columnists roll

    If anyone wants a good laugh please read this article. If you take a shot every time you find an error, you will likely be drunk before you are finished reading. http://news.yahoo.com/heres-rare-closeup-planet-thats-300-million-light-220223737.html;_ylt=Ah6ZqTKb53fikMKpqfgW6PXQtDMD
  21. P

    Which way does the cylinder roll? Solution posted doesn't make sense.

    Homework Statement A cylinder weighing 30lbs is initially at rest on a horizontal surface. There is a spring attached directly below the center, 2ft away from the center point o, pulling to the right horizontally. There is a string attached to the center and to a mass (around a pulley...
  22. H

    Area under the curve of a roll data of satellite

    Dear Members, I would like to ask if we plot the Roll data of a satellite in degrees vs. the time, and if we take the area under the curve of this roll will give something meaningful? Looking forward for your reply. Regards,
  23. Z

    Combine two pitch, yaw, roll rotations

    Firstly, I apologise if this is the wrong section, but as far as I could tell this was the most relevant. I have a pair of triplets (p1, y1, r1) and (p2, y2, r2). Each one describes a set of roll, yaw, and pitch rotations in that order, by the angles given by each component in respective order...
  24. S

    How to discharge a clear plastic film roll ? : (

    Hello ! Firstly, i'd like to say that I have nothing to do with physics - and everything I've learned in school - has been forgotten and I really hope you can help me with a small problem I have .. I bought a roll of clear plastic film (100 m) one like this...
  25. Saladsamurai

    Is It Better to Fold or Roll Clothes in Your Luggage?

    When you pack your luggage, what do you do? Fold clothes? Roll them? Does it matter? Other? (If I could figure out how to make a poll, this would be one :redface: )
  26. A

    Need help regarding roll center of a truck cab

    Hi, I am trying to find out the roll center of a truck's cab. I went over a similar thread in which jack action explained the concept of roll center. But I am having trouble applying it to something like the cab. It does not really have wheels or a multi-link suspension system like a car...
  27. M

    Probability dice roll questions

    Homework Statement A player rolls a fair die and receives a number of dollars equal to the number of dots appearing on the face of the die. What is the least a player should expect to pay in order to play the game? Homework Equations I don't really understand the question?? can...
  28. R

    On average how many rolls will it take to roll a 6?

    We have a simple, fair, 6 sided dice, and we ask the question - how many times will i have to roll it (on average) to get a 6? I made an experiment (although with only 50 rolls) and i got, that the average was around 5.4.
  29. I

    Multivariable Motion: Marbles Roll off Table, what is speed?

    Homework Statement Two marbles roll off a table at the same moment. One of the marbles has a horizontal speed of 1 inch per second, and the other has a horizontal speed of 4 inches per second. a) Which marble hits the ground first? b) If the table surface is 3 feet from the ground, what...
  30. A

    Outgoing dynamic force: taper roll between flanges

    Maybe I've asked this before but I can't find the topic any more. I'm looking for a way to calculate the outgoing force of a taper roll between two spinning flanges. Staticly this is not so difficult by using the force of the flanges clamping the taper roll and the roll angle. When the...
  31. S

    Probability: Die roll until first number

    Homework Statement Roll a fair die until the first time you roll a '5' then stop. Let X be the number of times you rolled the die. What is the probability that X is divisible by 3? Homework Equations E[X] ? The Attempt at a Solution I honestly have no idea how to even approach...
  32. S

    Automotive Roll stiffness affecting Steering Effort .

    I am currently working for a Touring Car Team . I have modified the front suspension geometry . Made the roll moment lesser and increased the Roll stiffness . Driver complained that the steering effort has increased considerably in the corners . 1.How does increased roll stiffness increase...
  33. A

    Dynamics of Taper Roll in Metal Industry: Calculating Forces & Movements

    Sorry guys, As I understand there is no introduction topic or what so ever so I'll do it here. Don't want to burst in without introducing myself. Hi I'm Andrew from the netherlands and during my websearch for a solution to my problem came across this forum. After finishing my mechanical...
  34. D

    If you roll a quartz ball into another quartz ball

    if you roll a quartz ball into another quartz ball... If you roll a quartz ball into a stationary quartz ball what would happen to any electrical energy in the collision? My guess is that the structures would need to be in perfect alignment for any meaningful electrical energy transfer and any...
  35. P

    Estimating n for 90% Confidence Interval of Dice Roll Summing to 117

    Homework Statement (I translated this from french) Some n dice are thrown and the sum of all their face values is 117. Estimate n through a confidence interval of 90%. In other words, of all the possible rolls of n dice that sum up to 117, find a range in which n should be located 90%...
  36. S

    Determining the total distance a solid sphere will roll.

    Hi guys. I'm trying to calculate the total distance a marble (I'm modeling it as non-deformable solid sphere) will travel along a flat cardboard surface (I'm also assuming the cardboard does not deform). The sphere will initially be propelled by a known external force, it can be assumed that...
  37. S

    Determining the total distance a solid sphere will roll.

    Hi guys not sure if this belongs in the homework section, anyway here goes! I'm trying to calculate the total distance a marble (I'm modeling it as non-deformable solid sphere) will travel along a flat cardboard surface (I'm also assuming the cardboard does not deform). The sphere will...
  38. B

    Probability. You roll, I roll game.

    Homework Statement You roll a die, and I roll a die. You win if the number showing on your die is strictly greater than the one on mine. If we play this game five times, what is the chance that you win at least four times? The answer is .1005 [b]2. Related Equations[\b] Binomial The Attempt...
  39. K

    Static friction over driven roll, slippage issue /paper machines/

    Hello All, on paper machine which I work we have such configurations as is showed on the sketch: http://imageshack.us/photo/my-images/706/systemt.jpg/ a forming fabric (wire) is driven by two rolls, couch roll (with two suctions chamber) and so called FDR (forward drive roll). On the...
  40. S

    Analyzing the roll of a bottle half filled with fluid

    This isn't really from my homework or anything like that, just something I was wondering about, but as my first post here I thought I might as well be on the cautious side and post it here. What I was wondering about is the motion of a bottle of water rolling down an incline. for the purpose of...
  41. I

    Installation Of Shaft Roll Mills

    Hi, I would like to ask if there is any website that explains the processes or the principles of how to install Shaft Roll Mills! It would be so helpful if I can get the step by step installation processes. Are there any Videos or Books. Thank you.
  42. U

    Finding Maximum θ for Apparatus Not to Roll Right

    Homework Statement The apparatus in the diagram consists of a solid cylinder of radius 1 cm attached at the center to two disks of radius 2 cm. It is placed on a surface where it can roll, but will not slip. A thread is wound around the central cylinder. When the thread is pulled at the angle...
  43. J

    Calculating Roll Bar Resistance

    Can somebody help to validate my formula? I believe the following can be used to calculate anti roll bar resistance; (Roll Bar Rate / (Wheel movement / Relative roll bar pickup movement)^2) * Track Width^2 / 2*Pi / 180 = Roll Bar Resistance My knowledge is limited so other than pondering...
  44. J

    Work Power Engergy Thrown Toilet Roll Problem

    Homework Statement A pure silver Lions fan throws a roll of toilet paper at 11.0 m/s from her seat at Ford's Field during a recent game. How fast is the 0.4 kg roll going when it strikes an opposition player 17.0 m below? Homework Equations 1/2mv^2 = mgh <-- i think. The Attempt at a...
  45. J

    Solve Imperial to Metric Conversion Error for Roll Bar Rate

    I have an equation taken from a book that when converting from imperial to metric gives me the complete wrong answer when converting back afterwards... it seems simple but I am obviously missing a trick, can anybody help? Imperial Equation Angular Rate / (Lever Length2 x pi /180) = Roll Bar...
  46. J

    Roll resistance calculations error?

    Hi, I am trying to calculate weight transfer from the front to rear of a vehicle and have already calculated the total sprung weight to be transfered. I now need to calculate the Roll resistance generated by the springs using the following forumula and this is where the error occurs...
  47. Evo

    Giant Tsunami-Shaped Clouds Roll Across Alabama Sky

    This is even weirder than mammatus clouds. http://news.yahoo.com/giant-tsunami-shape-clouds-roll-across-alabama-sky-192102289.html http://news.yahoo.com/photos/giant-tsunami-shaped-clouds-1324327483-slideshow/
  48. S

    Roll 2 fair dice, find pdf and cdf

    Hi guys. I have a test tomorrow and I am trying to work out the problems on the review sheet, but I can't figure out this one dealing with pdf and cdf. Roll 2 fair dice and call each outcome (i,j) where i,j = 1,2,...6. Define: X= {i+j if i+j ≤ 6 ; abs.value(i-j) otherwise} A) Find...
  49. wolram

    Why Do Sausages Roll Over While Cooking? Scientific Explanation Needed!

    Why is it that when i cook sausages i can brown them on one side, but, when i turn them over to brown the other side they turn over on there own. I am sure there must be a scientific reason, maybe steam trapped under the skin, any way the only way i can cook them all round is by sticking...
  50. J

    Angular acceleration of solid sphere on frictionless yoke unde no slip roll condition

    Homework Statement m=6kg r=0.18m Fapp=33N I'm struggling to understand how to answer this question and correlate the linear force applied to rotation without being given the coefficient of friction causing the rotational motion. The question states that a solid sphere of 6kg is...
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