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.

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  1. E

    What Caused This Unusual Rock Formation?

    Hi guys So I went on a field trip with my class and this is one of the things we saw: http://74.52.147.194/~devilthe/uploads/1320293567.jpg Can anyone tell me what that is from? I think maybe it's from a glacier or something of that sort that caused it...but I really have no idea and...
  2. F

    Why does a rock shatter a glass, but a bullet pass through.

    This is a simple enough question, but no one has been able to give me a satisfying explanation. Most people compare the momentum's of the bullet and the rock, and say that rock has a higher mass, so it's momentum is greater and it shatters the glass. I don't find this a convincing...
  3. J

    What is the Maximum Height of a Vertically Thrown Rock?

    Homework Statement Brad tosses a rock straight up at 40.0 m/s. What is the rock's velocity after 1.8 seconds? (answer 22.36 m/s) What is the velocity of the rock from the question above after 5.2 seconds? (answer -10.96) What is the maximum height of the rock from the question above...
  4. J

    Maximum Height of Vertically Thrown Rock

    Homework Statement Brad tosses a rock straight up at 33.4 m/s. What is the rock's velocity after 2.1 seconds? Homework Equations V=Vo+at X=Xo+Vot+1/2at^2 V^2=Vo2+2a(X-Xo) The Attempt at a Solution I used the first equation. V=33.4m/s+9.8(2.1) 9.8 being the acceleration due to...
  5. A

    A rock is THROWN downward. What was the initial height?

    Homework Statement A rock is thrown downward from an unknown height above the ground with an initial speed of 27 m/s. It strikes the ground 7.1 s later. Determine the initial height of the rock above the ground. The acceleration of gravity is 9.8 m/s2. Answer in units of m. Homework...
  6. N

    Projectile Motion - Rock Thrown Horizontally Off a Cliff

    Homework Statement A student stands on the edge of a cliff and throws a stone horizontally over the edge with a speed "v1". The cliff is "h" meters high. Given [h,v1], Determine: a. The time to hit the ground b. The horizontal distance traveled c. The magnitude and direction of the stone's...
  7. J

    Rock Climbing Energy Conservation (further help)

    Homework Statement I know that this question has been dealt with on this forum before, however it is part (b) that is new and that I need help with. I have re-written part (a) for clarity. Question: The greatest instantaneous acceleration a person can survive is 25g, where g is the...
  8. V

    Compressive stress on piece of rock

    Hi, I have a configuration in which a piece of rock is under hydrostatic pressure (see attached figure) and I'm trying to figure out what the stress on this rock will be. The boundary conditions on the Steel end plates are such that the right and left plates are restricted to move in the -ve X...
  9. W

    How far away is the rock face? (Wavelengths)

    1. A submarine sonar system sends a burst of sound with a frequency of 325 Hz. The sound waves bounces off an underwater rock face and returns to the submarine in 8.50s. if the wavelength of the sound wave is 4.71 m, how far away is the rock face? The answer is 6.51 x 10^3m. I keep trying...
  10. F

    Calculating Force Needed to Lift a Rock with a Crowbar

    What equation is used to solve a problem similar to the one below? What force must be applied to the end of a 2.0 meter long crowbar in order to lift a 500 Newton rock if the fulcrum of the bar is .5 meters from the rock? Thanks.
  11. phinds

    Would enough inert rock clumped together form a black hole ?

    When stars that have enough mass lose their internal energy (or most of it) they condense to a black hole. Would a large enough mass of cold, inert rock collapse into a black hole as soon as the mass became big enough as the rocks came together?
  12. E

    How do hydrocarbons migrate through granite and other intrusive rocks?

    I've read some places that people discover hydrocarbons in intrusive and metamorphic rocks? For instance in Vietnam and Venezuela. Why is this? Is it due to migration from sedimentary reservoirs (for instance if a granite intrudes a sedimentary rock)?
  13. C

    Astronomy, age of a moon rock, half life

    Moon rocks containing uranium 238, decays to lead with a half life of 4.5 billion yrs. The lunar rock sample you're invistigating contains half of the original uranium 238. How old is the rock? How would I go about solving this? What formula should I use?
  14. G

    Ballistic free-fall - rock slide

    Homework Statement At 6:52 pm PDT Wednesday, July 10, 1996, a large block of granite with an estimated volume of 78,000 cubic yards detached from the cliff between Washburn Point and Glacier Point in Yosemite Valley. The estimated mass of the granite is 80,000 metric tons...
  15. E

    Work energy question. Rock down a hill.

    Work energy question. Fish on a spring. Question has been changed as I figured it out. New one is on fish and springs Homework Statement If a fish is attached to a vertical spring and slowly lowered to its equilibrium position, it is found to stretch the spring by an amount d. If the...
  16. B

    Why do magnetic compasses spin when in the presence of magnetic rock?

    It has been said that magnetic compasses spin when in the presence of magnetic rock that contains a high concentration of magnetite. But the question is why does this happen? How is the magnetism of the magnetic rock turned by the magnetic compass into rotary mechanical motion?
  17. T

    What is the speed of the rock right before it hits the ground?

    Homework Statement A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of 52.5° above the horizontal. The rock hits the ground 5.41 s after it was kicked. a) How high is the cliff? (60.3 m) b) What is the speed of the rock right before it hits the ground? c) What is...
  18. J

    What Stops a Falling Rock at the Atomic Level?

    I don't understand this, potential gravitation says that if i drop a rock it's energy is converted into kinetic energy of motion as it falls, so that the higher up it is released the more energy it has kinetically when it hits the ground, both balance out the potential and kinetic energy so that...
  19. F

    Mechanical energy- Falling rock

    Homework Statement If the original height of a falling rock is y1 = h = 3.0m; calculate the rock's speed just before it hits ground.Homework Equations From conservation of mechanical energy law 1/2mv1^2 + mgy1 = 1/2mv2^2 + mgy2 The Attempt at a Solution I think I'm supposed to find v2 i.e...
  20. F

    Solving for Minimum Velocity: Ball & Rock

    Homework Statement As in the attachement, find the minimum v such that the ball does not touch the rock. The Attempt at a Solution The solution given is mg*cos(theta) - mv^2/R = n < 0, where theta is the angle between the ball and the person. My question is why is there a normal...
  21. B

    Apparent weight of a submerged rock.

    Homework Statement What is the apparent weight of a rock submerged in water if the rock weighs 58 N in air and has a volume of 1.8 * 10^-3 m^3? And then as a continuation: A rock weighing 57 N with a volume of 2.3 10-3 m3 is submerged in a liquid with a density exactly twice that of...
  22. P

    What Are These Unidentified Rocks and Minerals I Found?

    Hi guys, I've a habit of looking for things on the ground but don't know what these are. The brown lump is slightly magnetic and has an oily sheen when it's wet. I'm guessing it's slag but am not sure, was found in farm country near Niagara falls. The pink piece is the oddity. I found it in the...
  23. C

    Are mineral wool and rock wool ceramics? 10x in advance

    Are mineral wool and rock wool ceramics?! 10x in advance
  24. A

    Rock in the med called gibraltar

    Good news! Jimmyp is alive! Tracked him down to that rock in the med called gibraltar, apparently he is quite well, working for an online game company and seeing a lady about 10 years older than himself, mentioned coming back on here so hopefully he will pop in and say hello to you all.
  25. D

    Projectile Motion Homework: Finding Time, Distance, and Speed

    Homework Statement A rock is thrown horizontally from a bridge at a speed of 32.6 m/s. If the rock is 32.0 meters above the river at the moment of release, find how long the rock is in the air? 2.56 seconds. Find the horizontal distance to the point of impact from the point of release? 83.31...
  26. M

    Solving a Rock Falling in a Well Problem

    Homework Statement Well this problem consists in, as the title says. A rock fall down a well, and it took you 4 seconds to ear the noise. It would be a rather easy problem, if it didn't had the sound in consideration. Oh and rigth now I apoligize for any errors or mistakes, I'm portuguese so...
  27. r-soy

    The mass of rock is 2.4 kg anf its volume is 950 cm^3 .

    The mass of rock is 2.4 kg anf its volume is 950 cm^3 . Find its density in (a) g/m^3 9b) kg/cm^3 I attch the answer see pic [PLAIN]http://store2.up-00.com/Oct10/UyF43394.jpg
  28. O

    Rock On Rod Stewart: Am I a Universe-Rule-Changer?

    Experiment 1: I have a steel rod . I heat the rod to temperature T. As the rod heats up, it expands to length L. This makes me happy. I let the rod cool down and contract back to its original temperature and dimensions. Experiment 2: Now I place a heavy rock on top of the rod, and heat...
  29. 7

    Kinematics, rock falling off cliff

    so I am kind of stumped on this one here... A rock is dropped from a sea cliff and the sound of it striking the ocrean is heard 3.4 seconds later. If the speed of sound is 340m/s, how high is the cliff? - now i got some variables, v1=0 m/s time(total)=3.4s...
  30. S

    Find how hollow a rock is given its density and its weight in water

    Homework Statement A geologist thinks a rock is hollow. The rock weighed in air is twice as much as when it's in water. Find the fraction of the rock's volume that is solid given the solid part of the rock is 2500kg/m^3 and water is 1000kg/m^3 Homework Equations rho = mass/volume Fb...
  31. Loren Booda

    The greatest poets of Rock & Roll

    In my opinion, Rock & Roll offers great music, but not so great lyrics. Who, like Bob Dylan, bucks the latter trend?
  32. C

    A rock of mass 0.19 kg falls from rest from a height of 15 m into a pail containing

    Thermodynamics A rock of mass 0.19 kg falls from rest from a height of 15 m into a pail containing 0.37 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1885 J/(kg·C°). Ignore the heat absorbed by the pail itself, and determine the...
  33. C

    Stargazing Mars' orbital telescope and ice rock

    Might one place a telescope in Mars orbit, in order to obtain 6" to 1 ft resolution, looking for closeup geological views; such as mars' stromatolytic fossils, or mars' ice (rock) on the surface, in form of a smooth surface that seems a bit odd? Might billions year old Mars' ice be opaque to...
  34. S

    Rock on Strings driving me crazy

    Physics 101 (forces), Rock on Strings: driving me crazy! okay, this problem is DRIVING ME CRAZY! please help me out here, it's a TYCHO homework: Homework Statement A 540 gram rock is held by two strings of 45 cm with ends 57 cm apart (distance d in the picture), any string will break...
  35. K

    Buoyancy: tossing Archimedes' rock out of a boat

    You're floating in a boat in a pool with a 100 pound rock in the boat. You carefully measure the water level of the pool. Then you toss the rock out of the boat into the water. It sinks to the bottom. Does the water level of the pool go up, down or stay the same? Quantitative...
  36. G

    Music Nerds Rock! - Check Out the Music Video Here

    "Nerds Rock" I thought this was cute/funny. Go youtube. http://www.youtube.com/watch?v=iUidEDWDlcA"
  37. M

    Angular momentum in projectile motion of rock of mass

    Homework Statement A rock of mass 55.0 g is thrown with initial horizontal velocity v_x = + 32.00 m/s off a building from a height of 29.00 m. Take UP to be the +y direction. You will need to calculate the angular momentum of the rock about the line along the edge of the roof as a function...
  38. rrw4rusty

    Vacuum Energy: same inside a rock?

    Hi, Even though it is called 'vacuum energy'... do we know or do we have some theory on... whether the activities of virtual particle pairs is the same whether in the relative vacuum of space or... with in ther Earth's atmosphere (where tests confirmed it) or... say inside a rock? Rusty
  39. T

    Answer Age of Rock: 1.7*10^9 Years

    Homework Statement Hi! I'm stuck on this one too. "A rock contains the radioactive isotope Rb-87. A piece of this rock contained 2,05*10^20 Rb-87 atoms and 8,25*10^20 decay products per kg. The half-life of Rb-87 is 47*10^9 years. How old is the rock?" Homework Equations...
  40. O

    Rock Climbing - American Death Triangle

    This is the first time I've ever been to this forum, so I'm hoping this is an appropriate place to post this. It's been a good amount of time since my college level physics courses and this rock climbing phenomenon has me stumped. There is a rock climbing anchor arrangement called the...
  41. Q

    Mysterious Rattling Rock - What Could Be Inside?

    A rock that rattles?? hey i have this rock that my father gave to me before he died. its an egg shaped rock but i doubt its an egg of any kind but i don't know, and when you shake it it rattles as if there is something inside of it. I am wondering what could be inside of it. Does...
  42. S

    Rock Group Performs in Bar: How Far Can You Hear?

    Homework Statement A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the music is 116 dB at a distance of 5.77 m from the door. At what distance is the music just barely audible to a person with a normal threshold...
  43. C

    Exploring Forces Acting on a Rock Dropped Off a Cliff

    Homework Statement I have to draw a force diagram for a rock dropped off a cliff at the moment of release. Is there any force acting upward on the rock at the moment of release? Homework Equations none The Attempt at a Solution I know the force of gravity acts downward on the...
  44. K

    What is the velocity and angle of impact when throwing a rock off a cliff?

    Homework Statement A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 23.0 m/s. The cliff is h = 22.0 m above a flat horizontal beach. 1. How long after being released does the stone strike the beach below the cliff? 2. With what speed...
  45. D

    Angular acceleration of a rock, in a tire, on a car

    Homework Statement A rock is wedged into the treads of a 15 in radius tire. The car to which it is attached is driving down the road at 70mph. What’s the angular acceleration of the rock? Homework Equations ar=- \omega02r The Attempt at a Solution Not sure where to begin...
  46. C

    Velocity of Sound, speed of rock and return of sound

    Homework Statement Rock is thrown vertically towards a bell 50m away, you hear the bell ring 4.5 seconds later, how fast was the rock travelling, assuming the speed of sound is 330m/sHomework Equations d=v/tThe Attempt at a Solution I like to draw my questions out, then fill in the data, so...
  47. K

    Request for a book: Chemical Thermodynamic by Peter Rock A.

    Hello! Does anyone have a free ebook of Chemical Thermodynamic by Peter Rock A.?
  48. T

    Calculate Speed of Rock after Falling 5 Seconds in Vacuum

    I used to know this stuff. How fast will a rock be going after falling 5 seconds in a vacuum? I'd also like to know the formula in simple terms. At the gym on the hip sled we call it- you lay back and push up with feet and legs. The rack supporting the weights is at 45 degrees. If you...
  49. rhody

    Chris Sharma: Rock Climbing videos

    Back in the day, I used to do a bit of rock climbing, and to see how far the sport has progressed is simply amazing. To climb at this level is only for a few who are young, light, strong, possesses great focus, concentration, and determination. My personal favorite: Realization Listen...
  50. H

    If god is omnipotent, could even he make a rock so big

    if god is omnipotent, could even he make a rock so big that he could not move himself?
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