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.
How would I go about deriving the cooridinate numbers of both ions in rock salt, and,
how could I account for the differences in lattice enthalpy between the following;
LiCl (861 kJ/mole) - NaCl (787)
LiCl - LiF (1046)
LiCl - MgO (3850)
Cheers.
Here is the Problem. A 2.8-kg block slides over the smooth, icy hill shown in the figure .The top of the hill is horizontal and 70 m higher than its base. i attached the Figure Below.
What minimum speed must the block have at the base of the hill so that it will pass over the pit at the far...
Homework Statement
Bob can throw a 620g rock with a speed of 30m/s. He moves his hand forward .8m 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...
A rock of mass 200g is attached to a 0.75m long string and swung in a vertical plane.
A) what is the speed that the rock must travel so that its weight at the top of the swing is 0?
B) what is the tension in teh string at the bottom of the swing?
C) if the rock is now moved to a horizontal...
A friend and colleague found a fossil and brought it into show me. It is a small leaf in a rock. He asked me how the rock was formed, but I couldn't say as I know nothing of such things. The rock is layered. You can see the various layers by looking at the rock edgewise. In fact, the edge is so...
A rock hound finds a solid rock that contains only quartz and gold. The rock has a mass of 12.08 kg and a volume of 3.909×10-3 m^3. What is the mass of the gold contained in the rock?
Density of gold: 19300 kg/m^3
Density of quarts: 2660 kg/m^3
A rock of mass 200g is attached to a 0.75m long string and swung in a vertical plane.
A) what is the speed that the rock must travel so that its weight at the top of the swing is 0?
B) what is the tension in teh string at the bottom of the swing?
C) if the rock is now moved to a horizontal...
Homework Statement
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 33.0 m above sea level, directed at an angle θ above the horizontal with an unknown speed v0
The projectile remains in flight for...
Homework Statement
Bob, who has a mass of 85 kg, can throw a 450g rock with a speed of 30m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.8m. a.) What constant force must Bob exert on the rock to throw it with this speed...
Homework Statement
Imagine a climber 5.00 m directly abour her uppermost piece of protection, with no slack (exercise lenght) in rope, and the next piece of protection is 6.00 m directly below the uppermost piece of protection. She falls with an acceleration of 9.80 m/s^2 downward. The first...
Homework Statement
A soccer player kicks a rock horizontally off a 40.0-m-high cliff into a pool of water. If the player hears the sound of the splash 3.00s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
Homework Equations
Well to...
Homework Statement
1. A person throws three identical rocks off a cliff of height h with exactly the same speed v0 each time. Rock A is thrown vertically upward, rock B is thrown straight out horizontally, and rock C is thrown straight downward. If we ignore the effects of air resistance...
A small but amazing set of pictures for this contest. Please vote for the picture that best represents our theme, which are on boats and other floating vessels.
1. dontdisturbmycircles
http://img120.imageshack.us/img120/9024/p1000654jx5.jpg
2. siddharth
3. ZapperZ
4. George...
I don't know much about classical physics, if I throw a rock or mass M upward with an initial velocity Z, with gravity g and air resistance A acting against it, is this equation the right one ;
m\frac{dv}{dt} = (Z-g)m -Av
Then if I want to know the maximal height, I just need to integrate...
Due to popular demand, our PF Photo Contest is BACK starting this week. All the rules are the same as before.
Rock The Boat
The theme this week involves boats and other floating vessels. It includes ocean liners, powerboats, sailboats, kayaks, barges, and dinghies. What are not included...
kicking rock of a building...
Homework Statement
A boy kicks a rock at a velocity of 19.8 m/s horizontally off the top of a 64 meter high building. How far from the top does the rock hit the flat ground? (neglecting air resistance)
Homework Equations
sorry, i don't know how to type...
Homework Statement
A climber of mass 72 kg can stand on a rock sloping at 40degrees to the horizontal. What can you deduce about the coefficient of static friction between his boots and the rock?
________________________________________________________
I'm really lost on this one. His...
A bridge rises 321m above the Arkansas river. Suppose you kick a rock horizontally off the bridge. The magnitude of the rock's horizontal displacement is 45.0 m. Fine the speed at which the rock was kicked. (This is not what i ask you here)
Does the ball travel 321m vertically in free fall...
A rock with a volume of 0.2m3 is fully sumberged in water with density of 1000kg/m3. What is the buoyant force acting on the rock?
Assume that gravity acts on the system
0.2m3*9.81m/s2 = 1.96
buoyant force = 1000kg/m3*1.96
= 1960N
?
[b]1. You are standing on the edge of a ravine that is 11.5m wide. You notice a cave on the opposite wall whose ceiling is 6.4m below your feet. The cave is 4.7m deep, and has a vertical back wall. You decide to kick a rock across the ravine into the cave.
1. What initial horizontal velocity...
Homework Statement
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 32.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0...
a rock is thrown from the tope pf a 20m buliding at an angle of 53 deg. above the horizontal. of the horizontal range of the throw is equal to the hieght of the buliding, with what speed was the rock thrown?
if i am given range i am trying to use x=xo+vot+.5at^2
but i don't know the time...
Homework Statement
A rock of mass 5.5kg is hanging from the ceiling moving in uniform circular motion. The radius of the orbit is .8m. The angle of the rope in comparison to if it were hanging straight down is 15 degrees outward.
What is the magnitude of the force of the cord on the...
A rock is thrown from the roof of a building with a velocity v_0 at an angle of alpha_0 from the horizontal. The building has height h. You can ignore air resistance.
Calculate the magnitude of the velocity of the rock just before it strikes the ground.
Homework Equations
V=V_0 + at...
Homework Statement
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2s later. If the speed of sound is 340 m/s, how high is the cliff.
Homework Equations
d= v1t + 1/2at^2
v2^2 = v1^2 + 2ad
The Attempt at a Solution
I tried using d = vt...
This might seem a little strange because presumably a void would not have a magnetic field. However rocks do, so the situation I am considering is a body of rock which has permanent magnetization in one constant direction spread across the whole rock.
Without any voids the magnetic field...
Homework Statement
- A guy sees a rock falling from a plateau. He estimates the last third (1/3) of the rocks fall to last for 1,3 sec. Air resistance doesn't need to be taken into consideration.
- How far/what distance has the rock fallen?
Homework Equations
None given
The...
Homework Statement
Someone places a 6.0m long steel rod on a rock so that one end is under a baby moose weighing 2.0 kN. THe person pushes down on the other end of the rod with a force of 400N, and the moose is held in the air at rest. The rock was:
(a) 1.0m from the moose
(b) 5.0m from the...
k in my advanced physics class 32S we are doing a project on buoyancy, one of the questions we have to answer is if you go out in a pool in a boat with a rock in it, then you throw the rock over board will the water level go up/down/stay the same. I am pretty sure that the water level will go...
rock on a string on the ceiling??!
I'm stuck on this problem... any ideas??
A stone hangs by a fine thread from the ceiling and a section of the same thread dangles from the bottom of the stone. If a person gives a sharp pull on thedangling thread, where is the thread likely to break: below...
An 8.00 kg stone rests on a spring. The spring is compressed 7.0 cm by the stone.
(a) What is the spring constant?
11.2 N/cm
(b) The stone is pushed down an additional 30.0 cm and released. What is the elastic potential energy of the compressed spring just before that release?
76.7 J...
"On the moon of a distant planet, an astrnaut measures the period of a simple pendulum, 0.85m long, and finds it is 4.7 seconds. Back on Earth, she could throw a rock 13m straight up (while wearing her spacesuit). With the same efoort, how far up can she throw the same rock at her present...
A geologist finds that a moon rock whose mass is 7.85 kg has an apparent mass of 6.18 kg when submerged in water. What is the density of the rock
Would I use pressure to solve for the mass of the moon rock?
This is the problem:
You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to find a) its speed just as it left the ground; b) its maximum height.
I drew a...
*4. 23) A soccer player kicks a rock horizontally off a 40.0 m high cliff into a pool of water. If the player hears the sound of the splash 3.00 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
What I did:
Again I drew a diagram. I...
Hi,
A rather simple question that I just can't seem to solve:
The greatest instantaneous acceleration a person can survive is 25g, where g is the acceleration of free fall. A climber's rope should be selected such taht, if the climber falls when the rope is attached to a fixed point on a...
Life exisits on the third rock, maybe because of some exquisitve tuning of cosmological parameters, or maybe it is just a fact, so far life on the third rock is unique, so how safe is this (fact) (chance), given that migration to other planets is far in the future, what chance does life have...
In Figure 12-38, a 50 kg rock climber is in a lie-back climb along a fissure, with hands pulling on one side of the fissure and feet pressed against the opposite side. The fissure has width w = 0.20 m, and the center of mass of the climber is a horizontal distance d = 0.40 m from the fissure...
I think it is safe to say that all musical talent in the United States has been exausted. I just watched Conan and the musical "talent" for the show was a band called "Be your own pet". This was not music. This could not be construed to be music either. No human being on this planet with ears...
Hello, if someone could help me with the second part of this problem, I would be so grateful.
A rock is tossed straight up with a velocity of + 20 m/s When it returns, it falls into a hole 10 m deep.
What is the rock's velocity as it hits the bottom of the hole?
I got -24.4 m/s for...
Congrats to Finland and Lordi to their first victory in the Eurovision Song Contest!:biggrin: :biggrin: :biggrin:
I don't even know what to say about the performance...:biggrin: :eek: :tongue:
http://eurovision.lordi.org/
http://www.eurovision.tv/english/index.htm...
I have often seen arguments like these
by people who claim that they have disproved the existence of God. Either answer would mean that God is not omnipotent and therefore cannot exist.
Now I am an atheist. Is there any merit to the above argument?
I have equations for the following problem and an answer, but I am not sure if they are correct:
Suzie (a geology student) is attacking a police van during a demonstration for peace and love at the University. The van is escaping at 3.2 m/s. Suzie throws her rock when the back of the van is...
A 52 kg rock climber is climbing a “chimney” between two rock slabs. The coefficient of static friction between her shoes and the rock is 1.33; between her back and the rock it is 0.89. She has reduced her push against the rock until her back and her shoes are on the verge of slipping. (a) What...
I rather liked https://www.physicsforums.com/showthread.php?t=110807", and thought it had potential (for imagination that is - HINT HINT :rolleyes:), but it was shut down when it became too silly.
With Evo's permission (granted), and Mattara's permission (pending), I'd like to start it again...
Hi Everyone! I've been working on this Physics problem for the last week and I still can not figure it out! I'm sure I'm missing some very basic concept, but I'm not sure how to proceed:
An Australian bushman hunts kangaroos with the following weapon - a heavy rock is tied to one end of a...