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. B

    Interference of rock music at a concert

    Homework Statement Two loudspeakers at an outdoor rock concert are located 2.4 meters apart. You are standing 17.7 meters from one of the speakers and 20.7 from the other. During a sound check, the technician sends the exact same frequency to both speakers while you listen. The technician...
  2. T

    Kicking a ball off a spherical rock (without hitting it on the way down )

    Homework Statement A person standing at the top of a hemispherical rock of radius R kicks a ball (initially at rest) to give it an initial horizontal velocity v0 What is the minimum initial speed for the ball not to hit the rock on its way down? Homework Equations x=v_0 t y=R-\frac{1}{2}g...
  3. S

    How do i determine if a rock is qtz-norm, ol-norm, hy-norm or ne-norm?

    i have a rock that has been chemically anaylzed, all oxides are determined. the question is asking me to determine which is qtz-normative,, olivine-norm, hypersthene-norm or nephtaline-norm. ho do i determine which one it is based on the data i am given. the question also gives norm values for...
  4. N

    A rock rolling down an incline-velocity and force

    The question is: a spherical rock weighing 20 tons starts rolling down a steep incline from a height of 400 metres. Calculate the velocity when it reaches the ground level. What is the force exerted on the rock? I've tried to work this out but I just can't seem to grasp exactly what I'm...
  5. T

    What is the kinetic energy of a falling rock?

    Homework Statement b) A person standing on the edge of a 100 m high cliff drops a 0.5 kg stone vertically downwards. Determine the final velocity of the stone after falling 100m, and its kinetic energy. Homework Equations Final velocity v = √(2gx) The Attempt at a Solution final...
  6. N

    A rock dropped from a cliff using speed of sound

    Homework Statement A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 5.1 s later. If the speed of sound is 340 m/s, how high is the cliff? Homework Equations d=v/t(didnt work) The Attempt at a Solution My first attempt at this problem was to try...
  7. Borg

    'Moon rock' in Dutch museum is just petrified wood

    http://news.yahoo.com/s/ap/20090827/ap_on_re_eu/eu_netherlands_not_moon_rock_3" :rofl: http://d.yimg.com/a/p/ap/20090827/capt.97a493bc80a74af8bd49d6f1c24f68b3.netherlands_not_moon_rock_ams101.jpg?x=384&y=345&q=85&sig=.9mO0od3hiEuR5gaWQ_m0g--
  8. C

    Classic Rock Hits: Cream, ZZ Top, CCR & More!

    What're your fav songs from the classic rock (or what my gen. would call classic rock)? I've been listening to Cream, The yardbirds, ZZ Top, CCR, Zepplin, and well, they are the garbagee! I love Clapton and his brilliant leads. Tales of Brave Ulysses, Strange Brew, White Room are great songs...
  9. O

    How Fast Will the Climber Accelerate and How Long Until the Rock Falls?

    A 75 kg climber finds himself dangling over the edge of an ice cliff, as shown in the figure below. Fortunately, he's roped to a 980 kg rock located 51 m from the edge of the cliff. Assume that the coefficient of kinetic friction between rock and ice is 5.5×10−2. What is his acceleration, and...
  10. W

    Kinematics of rock on planet

    An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.55 m/s . The rock falls through a vertical distance of 1.20 m and lands a horizontal distance of 8.60 m from the astronaut. What is the acceleration of gravity on zicron? I have no idea how to even start.
  11. C

    Related rates falling rock with shadow

    Homework Statement a light shines from the op of a pole 50ft high a ball is dropped from the same height from a point 30 feet away from the light , how fast is the shadow of the ball moving along the ground .5second later. So is the ball falling at 32ft/s^2 would we set it up...
  12. A

    Calculating Velocity of Meteor Rock Fragment Falling on Neptune

    Homework Statement A 1250kg meteor rock fragment is momentarily at rest at an altitude of 3000km above the surface of Neptune. Neptune has a mass of 1.03x1026kg and a radius of 2.48x107m. Determine: how much work is done on the rock by Neptunes Force of gravity as the rock falls to...
  13. matthyaouw

    VOTE PF PHOTO CONTEST - Rock my world

    1.Mororvia http://img90.imageshack.us/img90/9461/rocks.jpg 2.Ms Music 3.Waveform http://i310.photobucket.com/albums/kk426/antiparticle/Peggyscove.jpg 4.ZapperZ 5.Edward http://img5.imageshack.us/img5/9643/scan110011011.jpg 6.Matthyaouw 7.Kbaumen 8.Hypatia...
  14. matthyaouw

    PF PHOTO CONTEST - Rock my world (mar 28 - apr 4)

    Rock my world As the self-confessed geology geek that I am, I love rocks. Pictures of stones, rocks, crags, outcrops, clifs, pebbles, etc... Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a...
  15. K

    The Big Rock Paradox: Stephen Hawking's Thought-Experiment

    I was first introduced to this thought-experiment upon reading Stephen Hawking's A Brief History of Time . Suppose an omnipotent being exists. If it does, it would be able to do anything (by definition!). Therefore, it would be able to produce a rock it couldn't lift. Therefore, it wouldn't be...
  16. C

    Solve 500g Falling Rock Problem: Initial Speed

    Homework Statement A 500g rock is thrown straight down from a bridge and hits the water 5.2 m below. If the rock strikes the water at a speed of 12.5 m/s, what was the initial speed of the rock? Homework Equations I'm not totally sure... The Attempt at a Solution I have no idea...
  17. N

    Sound Waves dropping a rock into a well

    Homework Statement When you drop a rock into a well, you hear the splash 1.5 sec later. How deep is the well? Homework Equations The Attempt at a Solution Speed of sound 343m/s x=(343m/s)(1.5)=514.5
  18. N

    How Old is This Interesting Rock From Arizona?

    I found an interesting rock in a river bed in Arizona once. I think this rock would prove that the Earth is much more than 10,000 years old as creationists like to believe. It was a piece of conglomerate. It had been rounded in the river bed, about 10" across. The interesting thing was that it...
  19. Loren Booda

    What are some commonly misheard lyrics in rock 'n' roll songs?

    What lyrics have you previously attributed to songs which you later learned were otherwise? For instance, I heard: "They proceeded to tear the whole town down." (Actually "...hotel..." from We're an American Band, by Grand Funk Railroad.) For instance, I heard (the most famous tuneout?)...
  20. J

    Rock Climbing: Work Done by Gravity & Change in GPE

    Homework Statement A rock climber of mass 92.1 kg starts at the base of a cliff and climbs to the top (h = 33.8 m). He then walks along the plateau at the top for a distance of L = 289.9 m. (a) Find the work done by gravity. (b) What is the change in the gravitational potential energy...
  21. L

    Tension from string upon a rock

    Homework Statement Two 3 kg masses are attached to a string at r1=.5m and r2=1.5m from where the string is held in your hand. You swing them around together at 2 revolutions per second, each of them. The tension holding mass 2 (the distant part of the string) is what fraction of the tension...
  22. S

    What is the is the rise in temperature of the rock

    My Physics teacher gave us a quiz problem and I don't understand it really how he got his answer. Can you please give me your answer and an explanation for the answer Thanks. Here is the question: A .5 kg rock is dropped from a height of 20 meters into a pail containing .6 kg of water. The...
  23. S

    A .5 kg rock is dropped from a height of 20 meters into a pail

    My Physics teacher gave us a quiz problem and I don't understand it really how he got his answer. Can you please give me your answer and an explanation for the answer Thanks. Here is the question: A .5 kg rock is dropped from a height of 20 meters into a pail containing .6 kg of water. The...
  24. X

    Rock tossed straight up-Velocity question

    Homework Statement A rock is tossed straight up with a speed of 21 m/s. When it returns, it falls into a hole 15 m deep. What is the rock's velocity as it hits the bottom of the hole? How long is the rock in the air, from the instant it is released until it hits the bottom of the hole...
  25. A

    Kinematics rock thrown up in air

    kinematics ... rock thrown up in air Homework Statement If a rock is thrown upward on the planet Mars with a velocity of 22 m/s, its height (in meters) after t seconds is given by H = 22t - 1.86t^2. Find the velocity of the rock when t = a. When will the rock hit the surface? With...
  26. T

    Two strings spinning rock- tension

    Homework Statement A string 44 cm long will break under a tension of 24 N. Two such strings are tied to a 670 gm rock, their ends 60 cm apart. The rock is spun between them. What is the maximum speed it can spin before the string breaks? (Using pythagorean theorem, you can determine the radius...
  27. B

    Dynamics - Rock in tire tread *please check answer*

    I really have no idea if I even went about this problem right, maybe some of you wonderful people can help me out. Homework Statement http://img217.imageshack.us/img217/9358/wheeljk9.jpg The Attempt at a Solution http://img220.imageshack.us/img220/179/50999155cw8.th.jpg
  28. C

    Finding Velocity of a rock thrown into a well

    Homework Statement A rock is thrown downward into a well that is 9.17 m deep. If the splash is heard 1.15 seconds later, what was the initial speed of the rock? Assume the positive y-axis to point upwards Homework Equations Time of sound(Ts)= Distance/(343m/s) Time of stone(Tf)=Total...
  29. A

    What is the height of the cliff?

    1. To determine how high a cliff is, a llama farmer drops a rock, and then 0.800 s later, throws another rock straight down at a velocity of −10.0 m/s. Both rocks land at the same time. How high is the cliff? 2. I know some kinematics equations must be used 3. I am stumped...
  30. C

    Schools Mathematics Online @ University of Arkansas - Little Rock

    After months and months of research looking for a good mathematics degree online that's regionally accreditated, and I think I may have found a program that will set me up for grad school in mathematics and/or some other science. The program I found is at the University of Arkansas - Little...
  31. L

    Calculating Final Momentum in Inelastic Space Rock Collision

    Homework Statement In outer space rock 1, with mass 6 kg and velocity < 4100, -2900, 3200 > m/s, struck rock 2, which was at rest. After the collision, rock 1's velocity is < 3900, -2400, 3700 > m/s. What is the final momentum of rock 2 (p2f)? The Attempt at a Solution ok from my...
  32. W

    Acceleration of rock due to gravity

    A rock is dropped from rest at the top of a cliff 125 cm high. a) At what speed does it strike the ground? b) How long does it take? To find the velocity the equation used is v = u + at I know that (u = 0) as it's from rest and g = 9.81 ms (gravity) But I just need help on...
  33. K

    Calculating the Speed of a Dropped Rock on Mars

    Homework Statement An astronaut on Mars drops a rock straight downward from a height of 0.90 m. If the acceleration of gravity on Mars is 3.73 m/s2, what is the speed of the rock when it lands? find m/s The Attempt at a Solution .90m/3.73m/s2=.2413 squareroot .2413=.491...
  34. G

    A rock is thrown off of a cliff

    Homework Statement A stone is thrown vertically upward with a speed of 14.0 m/s from the edge of a cliff 95.0 m high (a) How much later does it reach the bottom of the cliff? (b) What is its speed just before hitting? (c) What total distance did it travel? Homework Equations Well I'm...
  35. J

    Largest mass of rock that wont sink the boat

    Homework Statement You begin by measuring one of the hemispheres, finding that it has a mass of 21 g and a diameter of 8.6 cm Basically you have a hemisphere shaped boat with mass 21g and diamter 8.6cm you have to find the heaviest mass of rock that u can put in the boat that won't sink it...
  36. H

    Rock climber elastic rope problem

    SOLVED Homework Statement Two rock climbers, Bill and Karen, use safety ropes of similar length. Karen's rope is more elastic, called a dynamic rope by climbers. Bill has a static rope, not recommended for safety purposes in pro climbing. Karn falls freely about 2.0m and then the rope stops...
  37. K

    Projectile problem-A rock is kicked off a 45 Degree hill at 15m/s.

    Projectile problem--A rock is kicked off a 45 Degree hill at 15m/s. Hello. I tried this problem and it's the last one for my problem set due Thursday, but my answer differs from the given answer in the back of the book. After trying the solution again, I searched Google and found this. I'm...
  38. P

    Bob Throws Rock: Force & Recoil Speed

    SOVLED Homework Statement Bob, who has a mass of 75 kg, can throw a 600 g rock with a speed of 35 m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.6 m. (a) What constant force must Bob exert on the rock to throw it...
  39. A

    Projectile motion - small rock thrown at beehive

    Homework Statement throws a small rock at a beehive from the ground at an angle θ above the horizontal. throws it at velocity v. the rock strikes the beehive just as it reaches the top of its trajectory. a)ignoring air resistance, what is the speed with which the rock hits thee beehive...
  40. N

    How Old Is the Rock Using Potassium-Argon Dating?

    Homework Statement The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40K has a 1.28 billion year half-life and is naturally present at very low levels. 40K decays by beta emission into 40Ar. Argon is a gas, and there is no argon in flowing lava...
  41. H

    What is Bob's maximum power output as he throws the rock?

    Homework Statement Bob can throw a 500 g rock with a speed of 30 m/s. He moves his hand forward 1.0 m while doing so. a. How much work does Bob do on the rock? b. How much force, assumed to be constant, does Bob apply to the rock? c. What is Bob's maximum power output as he throws the rock...
  42. rohanprabhu

    Stuck Between a Rock and a Hard Place: Rohan's Dilemma

    Hello everybody.. my name is Rohan Prabhu and I am tanked. The results of the various entrance exams to colleges that i gave have started coming in.. and i have tanked like hell in all of them. Now there are two options in front of me: Either take whatever college I get.. whatever degree I get...
  43. Q

    Potential energy of string and rock

    hi, I am new here..can you please help me understand this problem below? actually i have the solution already but i don't get it..sorry I am so stupid.. here's the problem: A small rock with mass .12 kg is fastened to a massless string with length .8 m to form a pendulum. The pendulum is...
  44. L

    Amplitude and intensity of rock concert

    Homework Statement At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, where you're sitting, increases by 87.0%. By what percentage does the intensity increase? Do not enter unit. Homework Equations...
  45. J

    Threshold of Hearing for Sound Waves in Outdoor Concerts

    Homework Statement A rock group is playing in a club. Sound emerging outdoors from an open door spreads uniformly in all directions. If the decibel level is 70 dB at a dis- tance of1.0 m from the door,at what distance is the music just barely audible to a person with a normal threshold...
  46. C

    Favorite Slow Rock Songs: Discover Yours Today

    Whats your favorite slow rock song? Something along the lines of clapton, or coldplay? Personally I like, wonderful tonight a lot. Its a beautiful song.
  47. F

    When will the rock hit the surface and with what velocity?

    Homework Statement "If a rock is thrown upward on the planet Mars with a velocity of 10 m/s, its height (in meters) after t seconds is given by H = 10t - 1.86t^2." a) Find the velocity of the rock when t = a b) Find the velocity of the rock after 1 second c) When will the rock hit the surface...
  48. S

    Solving Physics Homework: Velocity & Time of Rock in a Hole

    Homework Statement a rock is tossed straight up with a speed of 18m/s. when it returns, it fallls into a hole of 12 m deep. a) what is the velocity of the rock as it hit the bottom of the hole? b)how long is the rock in the air, from the instant it is released until it hit the bottom of the...
  49. Y

    The distance (not horizontal nor vertical) of a rock traveled in a projectile

    Homework Statement A small rock of mass m is kicked from the edge of a perfectly vertical cliff of height h, giving it an initial velocity ~vo that’s purely horizontal. The rock lands at a distance d away from the bottom of the cliff. The ground there is assumed horizontal and we neglect air...
  50. Andre

    Log, Rock & Scissors: Nature's RPS

    Roshambo is the name for a popular two-person hand game. It may also be referred to as Paper, Rock, Scissors. Rock blunts scissors, scissors cut paper, paper folds around rock. Nature plays it too. But instead of paper it uses logs: Log folds around rock...
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