Thursday

April 24, 2014

April 24, 2014

Number of results: 5,560

**Physics **

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of + 14.2 m/s and measures a time of 22.2 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due ...
*Thursday, September 6, 2012 at 9:19pm by Meghan*

**Physics -- check answers please**

1. In moving an object of mass 10 kg through a distance of 8.0 m, 40 J of work is done. The average force exerted is? my answer: 320N 2. What is the kinetic energy of a 20 kg object moving at a speed of 10 m/s? my answer: 1000J 3. the gravitational potential energy of a bird ...
*Sunday, February 23, 2014 at 6:39pm by Lisa*

**Physics**

The force of gravity on a 2.0 kg rock is twice as great as on a 1 kg rock. Why doesnt the heavier rock fall faster?
*Wednesday, July 13, 2011 at 1:25am by Capreeca*

**Physics**

a small rock with mass 0.20 kg is released from rest at point A which is at the top edge of a large, hemispherical bowl with radius R = .5m. assume that the size of the rock is small compared to R, so that the rock can be treated as a particle, and assume that the rock slides ...
*Tuesday, October 23, 2012 at 3:24pm by Frankie*

**physics**

A rock is tossed straight up with a velocity of 37.1 m/s. When it returns, it falls into a hole 18.8 m deep. What is the rock's velocity as it hits the bottom of the hole? Responses The gain in kinetic energy equals the loss of potential energy. (1/2) M (V2^ - V1^2) = M g *(18...
*Wednesday, October 8, 2008 at 12:56am by Vishnu*

**earth**

Could you tell a story of the rock cycle using a rock called Roger the Rock??
*Tuesday, February 23, 2010 at 6:28pm by Mitch*

**physics**

How high will a 1.85 kg rock go if thrown straight up by someone who expends 80.0 J of energy on it?
*Saturday, September 29, 2012 at 5:14pm by tracy*

**Physics**

You are hiking out in California and come across an abandoned mine shaft. Wondering how deep the mine shaft is you toss a rock in and it takes 5.1 seconds before hitting the bottom. How deep is the mine shaft in meters?
*Thursday, February 16, 2012 at 7:55pm by Rachel*

**College Physics**

Part A) A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance ...
*Wednesday, March 3, 2010 at 9:49pm by Kyle*

**scenice- Rock**

It says write a story about a rock. Where it came from? How it got into my yard? What wearthering and erosion affected the rock
*Sunday, December 16, 2012 at 2:54pm by Funke*

**7th grade science **

1) a classmate states that igneous rock must always become sedimentary rock next, according to the rock cycle. explain why this statement is incorrect. 2)why would granite have larger crystals than igneous rock s formed when lava cooled above the earth's surface?
*Tuesday, September 25, 2012 at 11:00pm by catalina*

**chemistry**

A student finds a rock on the way to school. In the laboratory he determines that the volume of the rock is 29.7 cm3, and the mass in 139.943 g. What is the density of the rock?
*Thursday, January 16, 2014 at 9:41am by Anonymous*

**physics**

A man fires a rock of a slingshot directly upward.The rock has an initial velocity of 15m/s.How long will it take for the rock to return to the level he fired it at?
*Thursday, April 4, 2013 at 4:06am by Shazz*

**Science **

A classmate states that igneous rock must always become sedimentary rock next , according to the rock cycle .explain why this statement is not correct
*Wednesday, October 23, 2013 at 10:23pm by Freddriuna*

**Physics**

One can get a good idea of how deep a well is, for example, by dropping a rock and listening to how long it take to hear the rock as it hits the bottom. Suppose a rock was dropped into a well that was 410 meters deep and after the rock hits the bottom, a sound wave travels at ...
*Friday, September 16, 2011 at 2:25pm by Jeff J.*

**science**

What if one type of rock was missing from the rock cycle. How would the absence of this rock affect the earth's crust and other geologic formation on our planet?
*Saturday, December 8, 2007 at 9:35pm by nana*

**Geology**

How were divisions of time separated when scientists created the geologic time scale? by the thickness of rock strata by the color of rock strata by the fossils found in rock strata by the location of rock strata
*Thursday, February 21, 2013 at 12:13am by Hi*

**Physics**

How high will a 1.60-{\rm kg} rock go if thrown straight up by someone who does 75.0 J of work on it? Neglect air resistance.
*Tuesday, September 27, 2011 at 2:08pm by Frank*

**physics**

a rock was thrown at the height of 50.0 m above the ground with an initial velocity of 20.0 m/s straight upward.
*Tuesday, October 4, 2011 at 7:13pm by hd*

**Calculus Help Please!!! Check **

If a rock is propelled upward from the surface of Mars at a velocity of 93 m/sec, it reaches a height s = 93t – 1.86t^2 after t sec. a. Find the rock’s velocity and acceleration at time t. v'(t)=93-3.72t a''(t)=-3.73 b. How long does it take the rock to reach its highest point...
*Tuesday, April 8, 2014 at 2:21pm by Tenshi*

**Calculus Help Please!!! Check **

If a rock is propelled upward from the surface of Mars at a velocity of 93 m/sec, it reaches a height s = 93t – 1.86t^2 after t sec. a. Find the rock’s velocity and acceleration at time t. v'(t)=93-3.72t a''(t)=-3.73 b. How long does it take the rock to reach its highest point...
*Tuesday, April 8, 2014 at 8:05pm by Tenshi*

**Physics**

A 1.1 kg lizard lies on a flat rock tilted. A person decides to tilt the rock hoping that the lizard falls off. The rock is tilted at an angle of 15 degrees with respect to the horizontal. The coefficient between the rock and the lizard is .16. What is the acceleration of the ...
*Monday, November 19, 2012 at 7:34pm by Elle*

**physics**

On Earth a rock falls an unknown vertical distance from a resting position and lands in a lake. If it takes the rock 2.5 seconds to fall, how high is the cliff that the rock fell from?
*Thursday, October 28, 2010 at 10:46am by guy*

**Physics**

Consider the motion of the rock in the figure below. What is the minimum speed the rock can have without the string becoming "slack"? (The rock is traveling in vertical circle. Assume that m = 1.6 kg and r = 0.48 m.)
*Friday, June 22, 2012 at 5:22pm by Sierra*

**MATH**

Suppose you toss a coin and will win $1 if it comes up heads. If it comes up tails, you toss again. This time you will receive $2 if it comes up heads. If it comes up tails, toss again. This time you will receive $4 if it comes up heads. Continue in this fashion for a total of...
*Sunday, November 2, 2008 at 10:41am by Marie*

**Math**

Suppose you toss a coin and will win $1 if it comes up heads. If it comes up tails, you toss again. This time you will receive $2 if it comes up heads. If it comes up tails, toss again. This time you will receive $4 if it comes up heads. Continue in this fashion for a total of...
*Sunday, November 2, 2008 at 3:32pm by Diane*

**Alg 1**

Landon is standing in a hole that is 6.5 ft deep. He throws a rock and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = -0.005x^2 + 0.45x - 6.5, where x is the horizontal distance of the rock...
*Tuesday, April 16, 2013 at 4:36pm by Jane*

**English**

1. A big rock fell off a truck. 2. A big rock fell from a truck. (Are both the same?) 3. The rock fell onto the street. 4. The rock fell on the street. 5. The rock fell to the street. (What is the difference among the three? Are they interchangable? Are they all correct? Which...
*Sunday, August 22, 2010 at 9:38pm by rfvv*

**7th grade science **

Q: An igneous intrusion cuts through three layers of sedimentary rock. which rock is the youngest? and why? A: A) the igneous intrusion B) the top layer of sedimentary rock C) the middle layer of sedimentary rock D) the bottom layer of sedimentary rock
*Sunday, November 18, 2012 at 1:56pm by Kate*

**science**

which statement about metamorphic rock is true? A.sandstone is a metamorphic rock B.metamorphic rock is cooled lava C.metamorphic rock is made from the two other kinds of rocks D.metamorphic rocks float because they are full of trapped gases and holes
*Wednesday, January 13, 2010 at 8:21pm by Anonymous*

**SCIENCE PPPLLLLLSSSSS HELP!!!!!!!!!!**

Which of the following forms when igneous rocks are weathered and eroded? (1 point) igneous rock sediment sedimentary rock metamorphic rock is it sediment or sedimentary rock!!???
*Wednesday, April 23, 2014 at 5:16pm by TTR+S<3*

**physics**

A straight ladder is leaning against the wall of a house. The ladder has rails 4.50 m long, joined by rungs 0.470 m long. Its bottom end is on solid but sloping ground so that the top of the ladder is 0.780 m to the left of where it should be, and the ladder is unsafe to climb...
*Monday, April 4, 2011 at 8:45pm by Bob*

**phy**

is that true or false A rock is thrown straight up into the air At the peak its acceleration was zero
*Friday, September 17, 2010 at 8:29pm by ami*

**Ýndustrial Engineering**

The figure shows the paths of a golf ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 41.00 m, y = 17.02 m, and t = 2.94 s. If the ball was dropped from a height of h = ...
*Monday, March 18, 2013 at 12:08pm by Ozgun*

**physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +13 m/s and measures a time of 20.5 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to ...
*Sunday, July 4, 2010 at 2:23pm by Dave*

**Physics**

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ? -Hfinal=hinitial+ vinitial*t -4.9t^2 0=0+10t-4.9t^2 when I solved for t I got .49t. Also, where did 4.9 come from? A man leans over the edge of a cliff and ...
*Sunday, September 9, 2007 at 3:50pm by Jess*

**statistics**

A national park is famous for its beautiful desert landscape and its many natural rock formations. The following table is based on information gathered by a park ranger of all rock formations of at least 3 feet. The height of the rock formation is rounded to the nearest foot. ...
*Tuesday, November 1, 2011 at 6:52pm by Brittany Buford *

**statistics**

A national park is famous for its beautiful desert landscape and its many natural rock formations. The following table is based on information gathered by a park ranger of all rock formations of at least 3 feet. The height of the rock formation is rounded to the nearest foot. ...
*Tuesday, November 1, 2011 at 6:52pm by Brittany Buford *

**physics**

c) A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff the rock has the speed of 29 m/s. Assuming that the air resistance can be ignored, find i. the initial speed of the rock (5 marks) ii. the ...
*Thursday, September 6, 2012 at 12:02pm by charley*

**physics**

How high will a 1.95 rock go from the point of release if thrown straight up by someone who does 66.5 of work on it? Neglect air resistance.
*Monday, June 25, 2012 at 8:42pm by Anonymous*

**Physics, Please Help**

A homeowner is trying to move a stubborn rock from his yard which has a mass of 1025 kg. By using a lever arm (a piece of wooden board) and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum 24.4 cm from the ...
*Sunday, November 25, 2012 at 7:02pm by Mike*

**Math**

Consider the following experiment. Start by tossing 30 dice.Then remove the dice that show 5s and 6s and toss the remaining dice.Repeat until you have 2 dice remaining. toss # 0 1 2 3 4 5 6 7 8 # of dice 30 20 15 11 8 6 4 3 2 Estimate the best function rule to model this data...
*Sunday, January 17, 2010 at 11:10pm by Mary*

**Calc**

If a rock is thrown upward on the planet Mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by H = 17t − 1.86t^2. (a) Find the velocity of the rock after one second. (b) Find the velocity of the rock when t = a. (c) When will the rock hit the...
*Monday, October 17, 2011 at 4:38pm by Katrina*

**Science**

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ...
*Tuesday, October 8, 2013 at 11:35am by Anonymous*

**Science**

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ...
*Tuesday, October 8, 2013 at 1:17pm by Anonymous*

**Science**

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ...
*Tuesday, October 8, 2013 at 5:17pm by Anonymous*

**science**

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ...
*Thursday, October 10, 2013 at 10:29am by Anonymous*

**physical science**

A 100 kg ball of lead rests next to a 10 kg rock. Which statement below is true? a. the lead ball and the rock have equal amounts of inertia b. if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is less massive. ...
*Monday, October 25, 2010 at 2:43pm by Trang*

**PHYSICS- Please Help :(**

A ball is thrown downwards at a velocity of 14m/s from a bridge. One second earlier a rock is dropped from the same bridge. a)When will the ball meet up with the rock. b)When will the ball meet up with the rock? c)What is the initial minimum speed by the ball in order to catch...
*Sunday, February 12, 2012 at 9:37pm by Coco*

**physics**

A rock is thrown horizontally from a bridge with a speed of 30.3 m/s. If the rock is 27.2 meters above the river at the moment of release, a)how long the rock is in the air? b)what is the horizontal distance to the point of impact from the point of release? c)what is the speed...
*Wednesday, November 3, 2010 at 10:05pm by Nathaniel*

**physics**

A straight ladder is leaning against the wall of a house. The ladder has rails 4.80 m long, joined by rungs 5.100 m long. Its bottom end is on solid but sloping ground so that the top of the ladder is 3.100 m to the left of where it should be, and the ladder is unsafe to climb...
*Monday, March 14, 2011 at 11:45am by kia*

**Physics**

Standing on the surface of a small spherical moon whose radius is 6.30 104 m and whose mass is 8.00 1018 kg, an astronaut throws a rock of mass 2.02 kg straight upward with an initial speed 42.2 m/s. (This moon is too small to have an atmosphere.) What maximum height above the...
*Thursday, June 28, 2012 at 3:19pm by James*

**science**

if a rock undergoes high temperatures and high pressures deep within Earth, what new type of rock will be foremed? Assume that the rock does not melt
*Sunday, September 16, 2012 at 8:33pm by kaylyn*

**Math**

4. Landon is standing in a hole that is 6.5 ft deep. He throws a rock, and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = 0.005x² + 0.45x – 6.5, where x is the horizontal distance of the ...
*Monday, March 11, 2013 at 7:51pm by Jim*

**Rocks**

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ...
*Wednesday, October 9, 2013 at 6:28pm by Anonymous*

**math**

Landon is standing in a hole that is 6.7 ft deep. He throws a rock and it goes up into the air, out of the hole, and then lands on the ground above. the path of the rock can be modeled by the equation y= -0.005x^2 + 0.48x - 6.7, where x is the horizontal distance of the rock, ...
*Thursday, April 26, 2012 at 12:30pm by Jane*

**Physics**

acceleration due to gravity questions A rock is dropped from a height of 7meters a) what is the average velocity of the rock during its fall b) how long does it take the rock to fall
*Thursday, February 25, 2010 at 12:14am by jake*

**Physics**

A rock stuck in the tread of a 50.0 cm diameter bicycle wheel has a tangential speed of 3.5 0m/s . When the brakes are applied, the rock's tangential deceleration is 1.40 m/s^2 . What is the magnitudes of the rock's angular acceleration at = 1.70 ?
*Tuesday, February 14, 2012 at 11:11pm by Max*

**Physics**

A rock stuck in the tread of a 50.0 cm diameter bicycle wheel has a tangential speed of 3.5 0m/s . When the brakes are applied, the rock's tangential deceleration is 1.40 m/s^2 . What is the magnitudes of the rock's angular acceleration at = 1.70 ?
*Tuesday, February 14, 2012 at 11:12pm by Max*

**Physics**

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ? -Hfinal=hinitial+ vinitial*t -4.9t^2 0=0+10t-4.9t^2 when I solved for t I got .49t.Am I suppose to plug .49t back into the equation? A man leans over the ...
*Sunday, September 9, 2007 at 6:44pm by Jess*

**DES**

A rock is being pushed by a stream with 30 N of force. The rock has a static friction of 40 N and a sliding friction of 20 N. Does the rock move?
*Monday, March 18, 2013 at 1:19pm by Judie*

**College Physics**

A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance on the ...
*Wednesday, March 3, 2010 at 12:59am by Kyle*

**physics**

A rock stuck in the tread of a 57.0 cm diameter bicycle wheel has a tangential speed of 3.00 m/s. When the brakes are applied, the rock's tangential deceleration is 1.40 m/s^2. At what time is the magnitude of the rock's acceleration equal to g?
*Saturday, November 27, 2010 at 5:50pm by skywalker*

**phys**

A rock stuck in the tread of a 56.0--diameter bicycle wheel has a tangential speed of 3.10 . When the brakes are applied, the rock's tangential deceleration is 1.30m/s2 What is the magnitudes of the rock's angular velocity at = 1.70 ?
*Monday, May 28, 2012 at 11:17pm by keren*

**physics**

A rock is thrown upwards from the top of a 100m cliff, on the way down the rock misses the edge of the cliff and continues falling to the ground. What is the distance that the rock travelled?
*Sunday, November 4, 2012 at 12:21pm by dhkk*

**Physics**

A rock is thrown vertically from the edge of a cliff that is 500 ft high. It takes 6.5 seconds for the rock to hit the ground at the base of the cliff. Assume air resistance is negligible. (a) What was the initial velocity (magnitude and direction) of the rock? (b) What was ...
*Friday, September 21, 2012 at 12:27am by josephz*

**physics**

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go? b. how much time is required for the rock to reach its maximum height? c. what is the rock's height at t=2.00s?
*Monday, September 12, 2011 at 7:10pm by mehari*

**physics**

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go? b. how much time is required for the rock to reach its maximum height? c. what is the rock's height at t=2.00s?
*Monday, September 12, 2011 at 7:15pm by mehari*

**Physics**

A slingshot is pulled back 55cm down to the ground with a rock in its pouch. The slingshot has a spring constant of 862N/m. The mass of the rock is 700g. What height is the rock when its velocity is 12m/s?
*Sunday, December 2, 2012 at 12:37pm by Snoop*

**Science**

Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.
*Thursday, January 9, 2014 at 4:16pm by Richard*

**science **

Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.
*Monday, March 10, 2014 at 2:43pm by victoria*

**Music**

What are rock ensembles? I went searching around the net to find out and all i came up with was the names of some really good rock bands. I'll try find out something useful but it might take a while =( An "ensemble" is a small group of musicians playing the same piece of music...
*Thursday, November 16, 2006 at 1:22am by Mariah*

**physics**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
*Thursday, November 29, 2012 at 8:31pm by jorge*

**physics..help PLEASE!**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 35 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
*Wednesday, October 8, 2008 at 12:42am by kelsey*

**physics - density**

A person got a metal rock, he knows this rock density is ρm, but he is worried that there might be a hole within the rock, how he found there is a hole or not? And how he found the fraction of the hole size to total rock size? write your experimental steps.
*Thursday, November 13, 2008 at 2:02am by Anonymous*

**physics**

A 17-kg rock is on the edge of a 103-m cliff. (a) What potential energy does the rock possess relative to the base of the cliff? 1 . J (b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground? 2 . J (c) What speed does the rock have as it...
*Thursday, May 10, 2012 at 11:51am by Amelia*

**physics **

Julie throws a rock vertically upward. From a height of 64.0 meters above thehow ground. The initial velocity of the rock is 31.0 meters per second neglect air resistance How long does it take for the rock to hit the ground? What is the velocity of the rock just before it hit ...
*Monday, April 1, 2013 at 4:06pm by kieshà*

**probability**

Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p, where 0<p<1. Let A be the event that there are 6 Heads in the first 8 tosses. Let B be the event that the 9th toss results in Heads. Find P(B∣A) and express it in...
*Thursday, February 27, 2014 at 5:42pm by vu*

**physics 100**

Bob, who has a mass of 60 , can throw a 800 rock with a speed of 26 . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 . a) What constant force must Bob exert on the rock to throw it with this speed? b)If Bob is...
*Saturday, October 13, 2012 at 1:02am by Bob*

**PHYSICS**

A 0.26kg- rock is thrown vertically upward from the top of a cliff that is 32m high. When it hits the ground at the base of the cliff, the rock has a speed of 29m/s. 1) Assuming that air resistance can be ignored, find the initial speed of the rock ? m/s 2) Find the greatest ...
*Monday, October 15, 2012 at 8:07pm by RoCu*

**Physics**

A rock of mass m = 1.8 kg is tied to a string of length L = 2.4 m and is twirled in a vertical circle as shown in the figure below. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when ...
*Wednesday, October 26, 2011 at 11:53pm by Freud*

**physical science**

A kg ball of lead rests next to a 10 kg rock. which statement below is true:a:the lead ball and rock have the same amount of inertia,b:if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is less massive,c: on the ...
*Saturday, January 29, 2011 at 2:13pm by ellen*

**Physics**

a rock suspended from a string moves downwards at constant a=g. Which of the following is true concerning the tension in the string? a) the tension is zero b)the tension is equal to the weight of the rock c)the tension is less to the weight of the rock d)the tension is greater...
*Wednesday, November 14, 2007 at 2:54pm by Andrea*

**Physics**

A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum height.
*Wednesday, July 11, 2012 at 11:49am by Sierra*

**Physics**

A spring is compressed .02m by a 0.5kg rock. The spring and rock are on a frictionless horizontal table. a) If the spring has a spring constant of 5N/m what acceleration will the rock have when released? b) How fast will the rock be moving when it reached the equilibrium point...
*Thursday, November 30, 2006 at 1:04pm by Josiah*

**physics**

The total energy of a 2.00 kg falling rock is 5000 J. If its potential energy is 1975 J, the kinetic energy of the rock is ____ J. The speed of the rock is ___ m/s
*Monday, March 28, 2011 at 12:03pm by courtney*

**physics**

To measure the height of a tree, you throw a rock directly upward, with a speed just fast enough that the rock brushes against the uppermost leaves and then falls back to the ground. If the rock is in the air for 2.1 s, how tall is the tree?
*Tuesday, September 7, 2010 at 1:10pm by frank*

**physics**

To measure the height of a tree, you throw a rock directly upward, with a speed just fast enough that the rock brushes against the uppermost leaves and then falls back to the ground. If the rock is in the air for 2.1 s, how tall is the tree?
*Tuesday, September 7, 2010 at 1:26pm by frank*

**physics**

A large rock that weighs 164.0 N is suspended from the lower end of a thin wire that is 3.00 m long. The density of the rock is 3200 kg/m^3. The mass of the wire is small enough that its effect on the tension in the wire can be neglected. The upper end of the wire is held ...
*Friday, April 27, 2012 at 1:46pm by anonymous*

**Physics 1**

A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s2. To what height does it rise? Help meh please.
*Wednesday, September 29, 2010 at 5:53am by Aisumi*

**Physics**

A) With what minimum speed must you toss a 190 ball straight up to hit the 15.0 -high roof of the gymnasium if you release the ball 1.70 above the ground? Solve this problem using energy. B) With what speed does the ball hit the ground?
*Wednesday, March 20, 2013 at 6:37pm by Jenny*

**Physics**

A) With what minimum speed must you toss a 190 g ball straight up to hit the 15.0 m-high roof of the gymnasium if you release the ball 1.70 m above the ground? Solve this problem using energy. B) With what speed does the ball hit the ground?
*Wednesday, March 20, 2013 at 6:59pm by Jenny*

**physics**

a rock weighing 20.0N falls from a height of 16.0m and sinks 0.600 m into the ground. from energy considerations, find the average force between the rock and the ground as the rock sinks. (avg. force) x (distance sunk) is the3 work done by the soil in decelerating the rock ...
*Wednesday, September 13, 2006 at 8:34am by Maggie*

**physics**

A rock, mass = 2.0 kg, is fired straight up at 60 m/s from a catapult. What will be its maximum height at the moment it stops going up and starts to come down? Use the magnitude of g to be -10m/s2.
*Saturday, March 23, 2013 at 10:02pm by Anonymous*

**physics homework**

You throw a 20 N rock into the air from ground level and observe that when it is 1 5.0 M high, it is traveling upward at 25.0 m/s. Use the work energy principle to find (a) the rock’s speed just as it left the ground and (b) the maximum height the rock will reach.
*Saturday, February 23, 2013 at 8:16pm by samantha*

**physics**

A straight ladder is leaning against the wall of a house. The ladder has rails 4.50 m long, joined by rungs 4.800 m long. Its bottom end is on solid but sloping ground so that the top of the ladder is 3.400 m to the left of where it should be, and the ladder is unsafe to climb...
*Monday, March 30, 2009 at 7:26pm by Jessi*

**Physics**

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? (I found the height to be 60.3 m) b) What is the speed of the rock right before it hits the ground...
*Saturday, February 5, 2011 at 3:47pm by Anonymous*

**physics**

A child wants to throw a rock into a puddle which is 20m away and 20m down a hill. If he can throw the rock at ana ngle of 60, what velocity does he need to release the rock at?
*Wednesday, November 17, 2010 at 9:50am by kristen*

**Geology **

If a rock contains an isotope with a half live of 600 million years, and 0.5 half lives have elapsed since the rock formed, how old is the rock in millions of years?
*Thursday, April 15, 2010 at 3:42pm by Dana*

**Pre-Calculus-check answers**

How many ways can 5 students be chosen from a group of 4 juniors and 6 seniors to be on the prom committee if exactly 3 students must be seniors? Answer: 5400 Find the probability of getting a sum of 5 on the first toss of two number cubes and a sum of 6 on the second toss. ...
*Saturday, October 11, 2008 at 2:03pm by Lucy*

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