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

    Throwing a Rock Up a Hill: Finding Final Vertical Displacement

    Homework Statement I was tutoring the other day, when we came across a problem that had me stumped! A person standing on a hill that forms an angle \theta = 30^o wrt to the horizon, throws a stone at {\bf v} = 16 m/s up the hill at an angle \phi = 65^o wrt to the horizon. Find y_f...
  2. M

    A rock is thrown with height, direction, and inital velocity provided

    Homework Statement A rock is thrown off a 100 m cliff at an angle of 38 degrees below horizontal with an initial velocity of 20.0 m/s. a) What is the total time in flight? b) What is the horizontal range? c) What is the max height reached by the rock? Homework Equations x = x_0 +...
  3. M

    Depth of a Water Well by dropping a rock

    Homework Statement A man drops a rock into a well. He hears the sound of the splash 3.2 seconds after he releases the rock from rest. The speed of sound in air (at the local ambient condition) is 338 m/s (a) How far below the top of the well is the surface of the water? (round your...
  4. E

    Projectile Motion rock throw Help

    If a rock is thrown horizontally from a cliff at 25 m/s, what will its velocity be (magnitude and direction) after 3.0 seconds. The answer is 38.6 m/s, and 49.6 degrees down, but I cannot figure out how to get to it. Not sure which equations to use, I just started and I am learning on my...
  5. johann1301

    What Forces are at Play on a Rock Sinking at Constant Speed in Water?

    If a rock is sinking in water with constant speed.. how many forces are working on it?
  6. H

    The laws of motion - rock sliding on a roof

    The laws of motion -- rock sliding on a roof Homework Statement One side if 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 15ms-1.The...
  7. M

    Impulse question: throwing a rock

    Hello, Homework Statement You throw a 0.500 kg rock underhand, as shown in the diagram. The rock starts at rest from the lowest point moving at an angle of 40° above the horizontal, and leaves your hand 0.300 s later having traveled 1.20 m. What is the average force that you exert on the...
  8. M

    Projectile motion rock off a cliff

    Homework Statement A rock is thrown down off a cliff at 18 m/s at an angle of 17 below the horizontal. If the rock hits a cliff that is 16m away, how far down did the rock fall. Homework Equations Vf= Vi + at change in Y= Vit + .5at^2 The Attempt at a Solution I tried solving for...
  9. Radarithm

    Simple 2D Motion, rock problem

    Homework Statement A stone is thrown horizontally from a height h above the ground (h > 0). The stone hits the ground after having traveled a horizontal distance x (x > 0). What is the expression for the initial speed v of the stone? Neglect air resistance. (please use the variables x and h...
  10. B

    Rock off cliff - calculate height by using speed of sound

    You are climbing in the High Sierra where you suddenly find yourself at the edge of a fog-shrouded cliff. To find the height of this cliff, you drop a rock from the top and 8.50s later hear the sound of it hitting the ground at the foot of the cliff. Ignoring air resistance, how high is the...
  11. G

    Calculating Maximum Range of a Catapulted Rock

    Homework Statement Assuming that the rock launched by a catapult is released from ground level, show that the theoretical maximum range is: R=2Mh/m, where M = mass of counterweight m = mass of rock h = height counterweight falls Homework Equations Ep=mgh Ek=(mv^2)/2 The Attempt...
  12. D

    Finding the Minimum θ for Rock Thrown at Speed v_0

    Homework Statement A boy throws a rock at speed v_0 at angle α from a balcony of height h. When the ball hits the ground, its velocity makes an angle θ with the ground. What is the minimum value of θ in terms of h and v_0 Homework Equations basic kinematics equations. The...
  13. S

    Could meteorites contain evidence of troilite drainage and trapped iron grains?

    I understand that when chondritic material is heated, the first material to melt is matte - eutectic mixture of troilite with a small excess of iron-nickel. This melts at about 990 Celsius. At this temperature, most silicate minerals are still solid. And so is nickel-iron, which needs over...
  14. D

    Visualizing a rock passing a window

    Homework Statement You are videotaping a birthday party in your dorm room; your dorm window in centered in the frame of your video camera. Suddenly, a rock passes by your dorm window! Assuming the rock was thrown horizontally, and assuming that the rock was traveling in a plane parallel to...
  15. S

    Circular Motion, Massless String - Swinging Rock

    1. Homework Statement : A rock of mass m is attached to a string of negligible mass and length L. The rock is released from rest from a horizontal position. When the rock is at point P, the string attached to the rock makes an angle θ with the horizontal. In terms of the quantities, m, L, θ and...
  16. L

    Stuck between a rock and a hard place.

    I'm a Junior, about to be a Senior, majoring in Physics at a California State University. I am terrified about my career prospects. I am a fairly good student (3.5 GPA) and really love physics. I've taken Quantum I, Modern Physics, Thermodynamics and a couple E&M classes and I have enjoyed...
  17. M

    Kinematics : A Rock Being Dropped off a Cliff

    Homework Statement A Rock is dropped from a cliff and the sound of it striking the ocean is heard 3 seconds later. If the speed of sound in air is 340m/s, how high is the cliff? Homework Equations The linear kinematics of motion equations: 1. x-x_{0}=v_{0}t+\frac{1}{2}at^2 2...
  18. M

    How Fast Does a Rock Accelerate Past a Window?

    1. A rock is dropped off the top of a building. On the way down, the rock passes a window. The window is known to be tall and the stone takes 0.154 to fall past the window. 1. What is the velocity of the rock at the bottom of the window? 2. How much time was necessary from the instant the rock...
  19. R

    Solving the Rock Falling: Velocity & Time

    Homework Statement A rock is dropped off the top of a building. On the way down, the rock passes a window. The window is known to be 2.00m tall and the stone takes 0.164s to fall past the window. 1)What is the velocity of the rock at the top of the window? 2)What is the velocity of the...
  20. C

    Probability of a rock striking a windshield in a particular location

    The windshield of a car has a width of 1067mm and a height of 889mm. The windshield also has a crack with a length of 305mm and a height of 1mm. What is the probability of a rock, with a random trajectory and a measurement of 1mmx1mm, hitting the windshield strikes directly in the center of the...
  21. E

    Hovering just above rock bottom. Academic Failure requesting help.

    This was the sub-forum where I thought I may be able to find any help in, so I really hope I didn't go wrong there. So, dear readers, I come to you because I have ran out of options to get me out of the mess I find myself to be in right now. If you could lend me your honest thoughts and advice...
  22. L

    Finding the Mass of a 1m Measuring Stick Balancing a 2kg Rock

    "A 2kg rock is suspended by a massless string from one end of a 1m measuring stick." 1. "A 2kg rock is suspended by a massless string from one end of a 1m measuring stick. What is the mass of the measuring stick if it is balanced as shown below." ______________ |___|___|___|___| M...^ ...^^...
  23. J

    Find the Force applied to a rock by a slingshot

    Homework Statement A sling shot can launch a 50gram rock at a speed of 24m/s if it is stretched .4meters before release. Find the average force applied to the rock Homework Equations Spring force = 1/2*k*x^2 1/2kx^2 = 1/2mv^2 The Attempt at a Solution tried to solve for K...
  24. S

    Find Spring constant given distance stretched by placing rock on spring

    Homework Statement A 8.00 kg stone lies at rest on a spring. The spring is compressed 10.0 cm (.1 m) by the stone. What is the spring constant? Homework Equations F = -kx E = (1/2)kx^2 U = mgh The Attempt at a Solution The solution provided uses a net force equation balancing Hooke's...
  25. T

    Calculate the speed of the rock as it enters Earth's atmosphere

    Homework Statement In Robert Heinlein's The Moon is a Harsh Mistress, the colonial inhabitants of the moon threaten to launch rocks down onto Earth if they are not given independence (or at least representation). Assuming that a gun could launch a rock of mass m at twice the lunar escape...
  26. G

    A rock from a boat - could you help me understand?

    Homework Statement A man on a boat throws behind him a rock of mass m1=2kg with a velocity of v1=18m/s. The mass of a man with a boat is m_2=90kg. What velocty v_2 will the boat go with? Homework Equations v2 = (m1*v1)/m2 The Attempt at a Solution So I was upsent on the lesson...
  27. G

    Throwing a rock - simple mechanics problem

    Homework Statement A rock was thrown at the angle of 30 degrees against the horizontal surface, being given a velocity V_0=12m/s. Find the largest height h and the Z - the range of the throw. Homework Equations h_{max}=\frac{v_0^2\cdot\sin^2\alpha}{2g} Z=\frac{v_0^2\cdot\sin...
  28. F

    Finding the depth of a well after dropping a rock

    Homework Statement You drop a rock(from rest) into a well. You hear the rock hit the bottom 3.15 seconds after you dropped it. How deep is the well? Do not ignore the time for sound to travel back up to your ear. Velocity of sound = 343 m/s (constant), g = 9.8 m/s^2 Homework Equations...
  29. F

    Length of acceleration for a rock fragment escaping Mars

    Homework Statement It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to...
  30. Evo

    Fossil and rock identification

    A number of people have said they are interested in this topic. Please posts any pictures, information or questions about rocks or fossils here. I'll start off with some odd formations in rock here from the Pennsylvanian period (318.1 to 299.0 mya). They appear to be strips of wood, but...
  31. P

    Mass vs. weight with a falling rock and a spring scale

    Homework Statement 1. You stand on a spring-loaded bathroom scale in a bathroom. The scale "reads" your mass. What is the scale actually measuring? 2. Similarly, you stand on a spring-loaded bathroom scale in an elevator that is accelerating upward at 2.0 m/s^2. The scale "reads" your mass...
  32. C

    Simple Projectile Motion of a rock

    Homework Statement A rock dropped from a cliff covers one-third of its total distance to the ground in the last second of its fall. Air resistance is negligible. How high is the cliff? Homework Equations v = v0 + at2 h = v0t + 0.5at2 v2 = v02 + 2ahh = distance in this case The Attempt at a...
  33. T

    When Is It Energetically Favorable for Rock to Split?

    When is it energetically favourable for a piece of rock to crumble into two pieces? I couldn't paste latex code here for the life of me so I attached a pdf containing my calculation. It is obviously wrong because it leads to the fact that a box-shaped rock of height sqrt(2) (say meters) would...
  34. P

    Floating Rock Raft: New Zealand Questions Answered

    Can anyone answer a couple of questions about the new floating rock raft off New Zealand ? How much mass does it contain ? Where is it headed ? ( or will it disperse ? )
  35. P

    Weight of system: water container and rock

    Homework Statement Container filled with water is placed on a scale. case #1 Lid is closed. Rock is placed on top of the lid. case #2 Rock is placed inside the water container, it sinks to bottom. Lid is closed. How does the weight (reading on the scale) compare in the two...
  36. J

    Exploring the Mechanics Behind Rock Tumbling

    In a rock tumbler, the stones collide with each other and break apart. Eventually they become smooth. I was thinking about exchange of energy like when billiard balls hit. When two billiard balls collide, they exchange their energy. It's a little different if they have different amounts of...
  37. R

    Calculating Impact of an object (small rock) on the front of a moving car

    Hey Guys, I have a problem I am working on and was wondering if someone could point me in the right direction. The problem: I need to calculate a force to apply to a given area of the front of a vehicle in relaticely small collision / impact with both a stationary and possibly a small...
  38. Evo

    How Have Rock Stars Changed Over the Years?

    I would not have recognized many of them. http://www.nbcsandiego.com/entertainment/music/NATLRock-Stars-Then-and-Now-97329329.html
  39. T

    Find Max Speed Before String Breaks for 6 kg Rock on Rope

    Homework Statement so there's a 6 kg rock spinning in a circle with a string that can with stand a maximum tension of 75 and a radius of 1.5m and i need to find the maximum speed before the string will breakHomework Equations Fnet=ma a=4\pi2R/T2 The Attempt at a Solution so Fnet =ma and a =...
  40. S

    Rock climber force diagram and acceleration

    A 70kg climber is dangling over the edge of an ice cliff. He is roped to a 940kg rock located 51 m from the edge. The ice is frictionless, and the climber starts to accelerate downward. a) How would you find the acceleration of the climber? Would you use the force diagrams for the rock and...
  41. S

    Rock climber force diagram and acceleration

    A 70kg climber is dangling over the edge of an ice cliff. He is roped to a 940kg rock located 51 m from the edge. The ice is frictionless, and the climber starts to accelerate downward. a) How would you find the acceleration of the climber? Would you use the force diagrams for the rock and...
  42. A

    Vibrating Platform and Rock

    Homework Statement A vibration platform oscillates up and down with an amplitude of 10.4 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter? Homework...
  43. M

    Projectile motion of a thrown rock

    Homework Statement A hiker throws a stone from the upper edge of a vertical cliff. The stone ' s initial velocity is 25.0 m/s directed at 40.0 degrees with the face of the cliff, as shown in Fig. 3.1. The stone hits the ground 3.75 s after being thrown and feels no appreciable air resistance...
  44. J

    Final velocity of a rock and how it compares to work

    Homework Statement I have been given this example with the following questions: 1. Two rocks are thrown off of a cliff with the same initial speed, v. The first rock is launched with at an angle Ө directed below the horizontal as shown below as 1, while the second rock is launched above at the...
  45. V

    What is the approximate weight of a 20.kg rock

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  46. R

    Time to Hit the Ground for Thrown Rock?

    Homework Statement A rock is thrown vertically upward with a speed of 17.0 from the roof of a building that is 60.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? Homework Equations I used v^2 = vinitial^2 + 2a(y - yinitial)...
  47. P

    Kinematics: Initial velocity of second rock if 2 rocks are thrown up?

    Homework Statement Rock A is thrown straight up from the top of a 25m tall building at a speed of 20m/s. Exactly 1 second later Rock B is thrown in such a way that it lands on the ground at the base of the building at the same instant that Rock A lands. What is the initial velocity for Rock...
  48. M

    What is the surface height of a still pond after an object is dropped in it?

    I had an idea for a project that would make use of a formula for the surface height of a body of water after an object was dropped in it. I wouldn't need a time-dependent equation, just a nice snapshot...although a general equation (a function of x, y, and t) would be nice. I haven't had much...
  49. M

    Rock that gives off static charge when struck

    Does anyone know the name of a type of rock that gives off a static charge when hit, like struck with a hammer?
  50. A

    Acceleration of a Rock Problem

    Homework Statement A 0.0200-kg rock is shot directly upward with an average force of 98.0 n. The rock accelerates through a distance of 0.150 m. Homework Equations a.) Determine the acceleration while in the slingshot. b.) What is the velocity with which it leaves the slingshot? c.)...
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