What is Rock: Definition and 348 Discussions

Rock music is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, developing into a range of different styles in the mid-1960s and later, particularly in the United States and the United Kingdom. It has its roots in 1940s and 1950s rock and roll, a style that drew directly from the blues and rhythm and blues genres of African-American music and from country music. Rock music also drew strongly from a number of other genres such as electric blues and folk, and incorporated influences from jazz, classical, and other musical styles. For instrumentation, rock has centered on the electric guitar, usually as part of a rock group with electric bass, drums, and one or more singers. Usually, rock is song-based music with a 44 time signature using a verse–chorus form, but the genre has become extremely diverse. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political.
Rock musicians in the mid-1960s began to advance the album ahead of the single as the dominant form of recorded music expression and consumption, with the Beatles at the forefront of this development. Their contributions lent the genre a cultural legitimacy in the mainstream and initiated a rock-informed album era in the music industry for the next several decades. By the late 1960s "classic rock" period, a number of distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, southern rock, raga rock, and jazz rock, many of which contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic and hippie scene. New genres that emerged included progressive rock, which extended the artistic elements, glam rock, which highlighted showmanship and visual style, and the diverse and enduring subgenre of heavy metal, which emphasized volume, power, and speed. In the second half of the 1970s, punk rock reacted by producing stripped-down, energetic social and political critiques. Punk was an influence in the 1980s on new wave, post-punk and eventually alternative rock.
From the 1990s, alternative rock began to dominate rock music and break into the mainstream in the form of grunge, Britpop, and indie rock. Further fusion subgenres have since emerged, including pop punk, electronic rock, rap rock, and rap metal, as well as conscious attempts to revisit rock's history, including the garage rock/post-punk and techno-pop revivals in the early 2000s. The late 2000s and 2010s saw a slow decline in rock music's mainstream popularity and cultural relevancy, with hip hop surpassing it as the most popular genre in the United States.

Rock music has also embodied and served as the vehicle for cultural and social movements, leading to major subcultures including mods and rockers in the United Kingdom and the hippie counterculture that spread out from San Francisco in the US in the 1960s. Similarly, 1970s punk culture spawned the goth, punk, and emo subcultures. Inheriting the folk tradition of the protest song, rock music has been associated with political activism as well as changes in social attitudes to race, sex, and drug use, and is often seen as an expression of youth revolt against adult consumerism and conformity. At the same time, it has been commercially highly successful, leading to charges of selling out.

View More On Wikipedia.org
  1. W

    What is the composition and origin of this rock found in Israel?

    https://drive.google.com/file/d/0B6vFDqtp6QNEOW9CeUFYOWRGczA/view?usp=sharing The pictures in this post are of a "hammerstone," or pounder. It was found next to a large lower grinder (metate, quern, whatever term you prefer). It is 11 cm high and 13 cm wide. It most likely cracked from heat...
  2. D

    Optimizing Your Chances in a Game of Paper, Scissor, Rock: A Strategic Approach

    Let's consider a game of paper, scissor, rock. We have two players: player A and player B. Player A always do paper; player B always uses a strategy, where he tosses a die, and if it comes out 1 or 2- he goes rock, if it comes out 3 or 4- he goes paper, and if it comes out 5 or 6- he goes...
  3. Asmaa Mohammad

    Is oil shale considered a biochemical sedimentary rock?

    Could we classify oil shale as a biochemical sedimentary rock ? Oil shale is a muddy rock contains Kerogen. So I think in oil shale to be a mixture of Kerogen and mud sediments, and that's not the case, for instance, with the biochemical limestone where the solid remains of the living organisms...
  4. E

    Uranium-Lead Dating: Exploring Age of Rocks

    I just recently read about how we got to know the true age of the Earth but I am a bit confused and curious about one thing. The mineral or rock is initially going to be a uranium right? If it is, isn't all of it going to decay at the same rate? I know that a radioactive reaction is spontaneous...
  5. Dadface

    Music The famous scientist and the famous rock musician

    Can't help seeing some similarities. If Newton were alive today I wonder if he would be a fan of Led Zeppelin. Perhaps he would occasionally fill in for Robert Plant.
  6. wolram

    Help with finding vintage valve amplifier circuits (amplifiers for a rock band)

    Can anyone help please, I have been searching for vintage valve amplifier circuit diagrams and components. I need help in finding valves, transformers, and diagrams. I intend to build amplifiers for a rock band so i would like to build one with a 3KW output if that is feasible. Thanks for any...
  7. H

    How Does Entropy Change Affect Heat Transfer in a Cooling Rock?

    Homework Statement A hot rock ejected from a volcano's lava fountain cools from 1100º C to 40.0º C and its entropy decreases by 950 J/K. How much heat transfer occurs from the rock? (Source: OpenStax "College Physics for AP Students", Chapter 15.6) Homework Equations I used the equation ΔSh +...
  8. sas3

    Help Identify Rock in Western Upper Michigan

    I came across this rock and it just seemed out of place and was wondering if anyone could help identify it. I am in the Western Upper michigan area.
  9. aatari

    Newton's Second Law: Car and Rock Problem

    Hi Guys, I solved two questions below. Just need some feedback to make sure I solved them correctly. Thanks a bunch. 1. Homework Statement A car of mass 1.4 tonnes (1400 kg) traveling down the highway at 120 km/h has a F air of 1800 N acting against it. What force must be applied by the...
  10. R

    Rock is being thrown horizontally off a cliff (2d motion)

    Homework Statement A rock is thrown horizontally off a 56 m high cliff overlooking the ocean. And the sound of the splash is heard 3.60 seconds later. Speed of sound in air is 343 m/s. What was the initial velocity of the rock? 2. Homework Equations The Attempt at a Solution Okay so I know...
  11. Ugnius

    Calculating Rock Speed on Impact from 10m

    Homework Statement Rock is falling from 10meters 18km/h speed , what is speed of rock just before it touches the ground Homework EquationsThe Attempt at a Solution So in meters its like 5m/s and h=10m so t=2s if h=d , v=t*d=2s*10m=20m/s but i think i somehow should include gravity too so I am...
  12. Jarvis88

    1-D Projectile Motion: Throwing a Rock

    Homework Statement [/B] You throw a small rock straight up from the edge of a highway bridge that crosses a river. The rock passes you on its way down, 5.00 s after it was thrown. What is the speed of the rock just before it reaches the water 21.0 m below the point where the rock left your...
  13. Lori Fenton

    Identifying a Mysterious Rock: Seeking Help and Answers

    Can anyone help me identify this rock a friend of mine said it might be a nest of some sort or an egg curious to know if anybody has any ideas on what it is thank you
  14. N

    Rotational kinematics of a spherical rock upon collision

    Homework Statement A small spherical rock of mass collides in space with a large spherical rock of mass as indicated in the diagram. After the collision the rocks stick together to form a single spherical object. https://postimg.org/image/fltmg3bj5/ (New here so I've no clue how to upload...
  15. karush

    MHB 205_o6_05 How long does it take a rock falling from rest to reach a velocity

    $\tiny{205_o6_05_velocity}$ The equation for a free fall at the surface of celestial body in outer space ($s$ in Meters, $t$ in seconds.)\\ is $\displaystyle s=2.38t^2$ How long does it take a rock falling from rest to reach a velocity of $\displaystyle 25.7 \frac{m}{sec}$ on this celestial...
  16. Bryon Palmer

    What Are Rattling Rocks and How Are They Formed?

    I have a rock that I found while on a college class outing in Eastern Oregon. It is hollow inside and has multiple objects inside that rattle. I was told by a professor that isn't was formed when lava was ejected into the air and as it fell, it sort of ballooned out and solidified with smaller...
  17. J

    Rock Thrown from 32m Building: Vertical Velocity at 6m Question

    Homework Statement A rock is thrown off of a 32 m high building with a horizontal velocity of 5 m/s. What is the vertical velocity when it reaches 6 m from the ground? Use g = 10 m/s^2 A) 11 m/s B) 120 m/s C) 23 m/s D) 520 m/s E) 16 m/s Homework Equations Kinematics I think The Attempt at a...
  18. Const@ntine

    Rock falls from cliff-Initial Velocity?

    Homework Statement A footballer kicks the rock off the cliff, with a horizontal velocity. The cliff's height is 40.0m. The rock falls in a lake. The footballer hears the "splash" 3.00s later. Sound travels through air with a velocity of 343 m/s. What is the rock's initial velocity? a = -g =...
  19. R

    Finding a rock porosity change after an acid mix treatment

    Homework Statement A 3 wt% HF / 12 wt% HCL treatment is injected without an HCL preflush into a sandstone reservoir containing 10% CaCO3. If half of the HF is consumed in reaction with CaCO3 to form CaF2, what will be the next porosity change, considering both CaCO3 dissolution and CaF2...
  20. kubaanglin

    Falling Rock Climber (Work and Energy)

    Homework Statement Stretchable ropes are used to safely arrest the fall of rock climbers. Suppose one end of a rope with unstretched length ##l## is anchored to a cliff and a climber of mass m is attached to the other end. Ehrm the climber is a height ##l## above the anchor point, he slips and...
  21. K

    Rock thrown off a horizontal cliff

    < Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > The question states a stone is thrown off a cliff horizontal and it eventually hits the ground. A second stone is dropped from rest at the same height and it hits the ground too. The question...
  22. V

    Forces on abseiling (rappelling) rock climber: find vertical reaction force

    Homework Statement Can someone please help me with this A level physics question on Mechanics. Help will be appreciated. The picture of question is attached. :D Thank you Homework EquationsThe Attempt at a Solution [/B]sin20x590=201.79N or cos70x590=201.79N
  23. K

    Determine which rock was formed from a volcanic eruption

    Homework Statement Identify which rock pictured was most likely the result of a volcanic eruption. No info is provided besides the following pictures which I managed to find on the internet: https://commons.wikimedia.org/wiki/File:Volcanic_rock_from_Unzen.jpg...
  24. Riju

    Kinematics Question on falling rock

    Homework Statement A rock is thrown straight upward from the edge of a 30m cliff, rising 10m, then falling all the way down the base of the cliff.Homework EquationsThe Attempt at a Solution Well, because the rock was thrown 10m up, and then it came all the way down, I added those quantities...
  25. A

    Challenge problem -- rock sliding up and over a roof into an arc....

    Homework Statement One side of the roof of a house slopes up at 37.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child. The rock slides straight up the incline with an initial speed of 15.0 m/s. The coefficient of kinetic friction between the rock...
  26. evinda

    MHB Calculating the Angle between Ship and Rock

    Hello! (Wave) A ship that is at the position $(1,0)$ of a chart ( with the north at the positive direction $y$) "sees" a rock at the position $(2,4)$. Which is the vector that connects the ship with the rock? What angle $\theta$ does this vector form with the direction of the north? I have...
  27. J

    Making Rock Candy: Troubleshooting Sugar Crystallization

    So I am trying to make rock candy. I made my saturated solution of sugar about two and a half days ago and so far there is almost no crystallization on the skewer that I have sitting in the middle of the solution. But there is a layer of sugar crystals covering the top. Should I break that top...
  28. S

    Why is air-water contact angle usually assumed to be 0 ?

    I am a Ph.D student currently interested in fluid flow in porous media (rocks in my case). I am currently trying to find the range of values for the contact angle in air-water-sandstone systems at shallow reservoir conditions (say 7.5MPa and 35 degrees C). The only value I have managed to come...
  29. G

    What is the dating ratio of a rock sample that contains 87Rb and 86Sr?

    Suppose a rock sample at the time of its formation 3.6 × 10^9 years ago contained N0[87Rb] rubidium atoms 87 (87Rb), N0[87Sr] strontium atoms 87 (87Sr) and N0[86Sr] strontium atoms 86 (86Sr). From the relative abundance of the three species at the height of the rock formation yielded the...
  30. D

    A rock with a weight of 10 N is resting on a table.

    A rock with a weight of 10 N is resting on a table. A student makes a number of statements about this situation, are they right or wrong? 1. "The weight of the rock is a force of 10 N by gravity in the downward direction" I don't see anything wrong with this. 2. "The reaction force to this...
  31. I

    Rock Mechanics: Mohrs Stress Circle - Principal Stresses

    Homework Statement A series of shear tests were performed on a weak rock. Each test was carried out until the sample sheared, and the principal stresses for each test were: S. No.--- σ3 (KN/m2) --- σ1 (KN/m2) 1 --- 200 --- 570 2 --- 300...
  32. L

    Rock climber tension in rope

    Homework Statement A 65kg rock climber is abseiling down a rock, consider the situation when he's in equilibrium and standing at an angle on the surface of the rock, hanging from a rope. The rope is at an angle of 40 degrees to the horizontal, calculate the tension in the rope Homework...
  33. S

    Technical Knowledge of Technologists in Rock n Roll Bands

    The mid-end and high-end rock n roll performance bands have technical people or technologists to help with equipment (electric guitars, amplifiers, and variety of devices used with them; modifications, and repairs). Exactly what do these technical know, and how do they learn it? There have...
  34. D

    Minimum initial velocity for throwing a ball off a hemispherical rock

    Homework Statement At which minimum velocity should you throw the ball horizontally if you are standing on a hemispherical rock of radius R so that it at no point touches the rock and lands at the minimum distance from the rock horizontally. Find the expression that solves for initial velocity...
  35. P

    Describe the motion of the rock particle at point B during t

    Homework Statement 6 Earthquakes produce transverse and longitudinal seismic waves that travel through rock. Figure 8 shows the displacement of the particles of rock at a given instant, for different positions along a transverse wave. Figure 8: (b) Describe the motion of the rock particle...
  36. C

    Determining Angular Velocity Without Measuring Forces

    A couple of simple, (maybe dumb) questions - Consider a string, maybe a meter long, with one end attached to a small rock, and the other end attached to the shaft of a motor standing so the shaft points upwards. When the motor is turned off, the string hangs limp. When the motor runs, the rock...
  37. H

    Conservation of Energy: work done by air resistance on rock

    Homework Statement A 250 gram rock is thrown with a speed of 30.0 m/s. It has a speed of 22.5 m/s just before it strikes the ground. Determine the work done by air resistance. There is also a diagram which yields more information. The rocks path is horizontal and it strikes the corner of a...
  38. Spinnor

    NASA Rock ignites at 45,000mph over PA, NASA video, why flare up?

    From Google news, http://www.theregister.co.uk/2015/02/18/meteor_explodes_over_Earth's_beaver_in_hot_nasa_video/ Simple question, if you play the video in the link above the light from the meteor flairs up into a very large ball of light. Why don't we continue to see a relatively small point...
  39. RJLiberator

    True/False Igneous Rock Formation Question

    Homework Statement Huge volumes of igneous rock can be erupted and/or intrude in the middle of tectonic plates? True or False Homework EquationsThe Attempt at a Solution I am being thrown off by this rather simple problem. I understand that at the border of tectonic plates, a lot is...
  40. bitznbitez

    Are Martian rock formations similar to those on Earth?

    I ran into a link from a NASA page over to an Astrobiology webzine. In the article it referenced "sedimentary rock" on Mars. I don't really care about all the other claims of this article, some rather fantastic claims frankly. Rather I am interested in the use of the phrase sedimentary...
  41. O

    A rock falling towards the center of earth according to GR

    On youtube, I came across to one of many videos trying to explain General Relativity. One of the comments was interesting to me: "I understand how gravity causes an object with velocity to go in curves or to orbit, due to the curvature of space-time: the object thinks that it's traveling in a...
  42. H

    Determine the speed of the rock as it leaves the spring.

    Here is the question: A spring is compressed 20cm. When it is released, it exerts an average force of 57.2 N on a 7.3 kg rock, shooting it across a frictionless floor. Determine the speed of the rock as it leaves the spring. Homework Equations W=change in energy Work energy theorem W=Fd The...
  43. K

    Rock thrown from cliff, find initial and final velocities

    Homework Statement I'm taking grade 12 U physics and I'm having a really difficult time understanding the answers given compared to the answers I arrive at. For example: The question reads: A rock was thrown horizontally from a 25.0 m high cliff and landed 15.0 m from the base of the cliff...
  44. K

    Circular Motion of a moving rock Problem

    Homework Statement You hold a bucket in one hand. In the bucket is a 480g rock. You swing the bucket so the rock moves in a vertical circle 2.8m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of the bucket...
  45. N

    Heat Flow Through Rock Layers Problem

    Homework Statement The problem is here: Homework Equations q = heat flow k = thermal conductivity q = -k (dT/dY)The Attempt at a Solution While this is quite an easy question, I just want to verify that I'm doing it correctly. Would it be correct to begin at the bottom of the rock layer...
  46. C

    Differential Eqn: Find an expression of the velocity of a rock.

    Homework Statement A 20 kg rock falls with the force of gravity acting on it. Another force acts on the rock (same direction as gravity) that is proportional to the velocity squared, 100v^2. Come up with an expression of the rock's velocity at any time t. Homework Equations Hint...
  47. W

    Falling Rock on Planet X. Solving for 'g'.

    Homework Statement After performing a quadratic curve fit tool in Pro Logger, I was given the values: A = -1.426E-05 +/- 2.386E-06 , B = 0.02193 +/- 0.001581, C = 0.4785 +/- 0.1905. With this information, how is “g” for Planet X determined from the parameters of the curve fit equation...
  48. S

    Meter stick and rock balancing ?

    A uniform meter stick supported at the 25-cm mark is in equilibrium when a 1-kg rock is suspended at the 0-cm end. Is the mass of the meter stick greater than, equal to, or less than the mass of the rock? Explain your reasoning. Thanks in advance for any help!
  49. C

    Friction Between Clothing & Giant Rock: 833 N & μ=4.58?

    Is it possible to have friction between clothing and a giant rock equal to 833 N? The μ would equal 4.58. Isn't it too big?
  50. M

    How Do Geologists Determine the Age of Rock Samples Using Isotopic Ratios?

    Homework Statement Geologists are able to calculate ages of rock samples through measurements of certain isotopic rations combined with known radioactive decay rates (all such decays being considered to adhere to 1st order kinetic rate laws). Two such processes leading to stable isotopes are...
Back
Top