Rock Definition and 351 Threads

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...

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

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.)...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

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?

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)?

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?

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...

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...

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?

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...

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...

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...

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...

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...

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...

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

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.

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...

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...

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

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...

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...

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...

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

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...

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...

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...

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...

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

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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