Rock Definition and 351 Threads

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...

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...

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

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...

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...

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...

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...

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...

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...

http://news.yahoo.com/s/ap/20090827/ap_on_re_eu/eu_netherlands_not_moon_rock_3" :smile: 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--

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...

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...

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.

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...

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...

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...

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...

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...

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...

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

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...

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?)...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

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...