Wednesday

April 16, 2014

April 16, 2014

Number of results: 67,494

**physics**

Bill kicks a rock off the top of his apartment building. It strikes a window across the street 12 m away. The acceleration of gravity is 9.8 m/s2 . If the window is 24 m below the position where Bill contacted the rock, how long was it in the air? Answer in units of s.
*Wednesday, October 20, 2010 at 8:35pm by Anonymous*

**Physics I**

Bill kicks a rock off the top of his apartment building. It strikes a window across the street 18m away. The acceleration of gravity is 9.8 m/s sqaured. If the window is 12 m below the position where bill contacted the rock, how long was it in the air? Answer in units of s.
*Thursday, October 28, 2010 at 11:03pm by Tee*

**Physics**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 27 m high. When it hits the ground at the base of the cliff the rock has a speed of 24 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
*Monday, March 29, 2010 at 8:03pm by Carden*

**Physics**

A person jumps straight up. Do they spend more time in air while in the top half or bottom half of the total height? What is the ratio of the two times?
*Wednesday, September 11, 2013 at 9:37pm by John*

**physics**

A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 80.0 m due east. Path 2 is 250.0 m due south. Path 3 is 130.0 m 30.0° south of west. Path 4 is 190.0 m 60.0° north of west. At the end of the walk, what is the person's ...
*Thursday, December 13, 2012 at 8:11pm by Anonymous*

**physics**

A catapult gives a rock a vertical velocity of 122m/s. a. Determine the time the rock is in the air. b. Determine the maximum height the rock would reach. c. As the rock leaves the catapult the rock also has a horizontal velocity of 34m/s. solve for the rocks range. d. Solve ...
*Monday, November 19, 2012 at 9:01pm by Sadie*

**Algebra**

This question deals with Exponential Growth and Decay Test. Question:Consider the following:Start by tossing 30 dice. Then remove the dice that show 5s and 6s and toss the remaining dice. Repeat this process until you only have 2 dice remaining. The data in the table were ...
*Sunday, January 17, 2010 at 11:38pm by Mary*

**Physics-check answer please (multiple choice)**

1. A 2.5 kg mass at rest on a horizontal surface is acted upon by an applied horizontal force of 150 N. A frictional force of 100 N acts on the mass. How much work is done on the mass? my answer: would the work be 0? ------------------- Yes, no motion, no work...
*Monday, February 24, 2014 at 6:59pm by Damon*

**science**

two cyclists are riding their bikes up a steep hill. hessica rides her bike straight up the hill. adrian rides his bike up the hill in a zigzag path. adrian and jessica have identical masses. once they reach the top of the hill, does adrian have less gravitational potential ...
*Monday, January 7, 2013 at 6:25pm by Taylor*

**Physics **

A rock thrown straight up with a velocity of 29 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 44 m/s when it strikes the ground. How tall was the building? The acceleration of gravity is 9.8 m/s Answer in units of m
*Monday, September 3, 2012 at 9:47pm by Diane*

**Physics**

First of all the mass of the rock has nothing to do with this problem. if it is thrown straight up at at Vi = 19 m/s from a height of 1.75 meters: V = Vi - g t at top, v = 0 0 = 19-9.81 t t = 1.94 seconds to top h = 1.75 + 19(1.94) -4.9(1.94)^2 h = 20.2 meters high if it is ...
*Thursday, January 16, 2014 at 8:54pm by Damon*

**math**

You're right. Each toss is independent of other tosses. Therefore each toss has a 1/2 chance of landing heads up.
*Sunday, May 12, 2013 at 9:05pm by Ms. Sue*

**math**

Suppose you toss a coin and it you win a dollar if it comes up heads. If it comes up tails you toss the coin again. This time you get two dollars if it is heads. If it is tails you toss it again. This time you win four dollars if it is heads, but if it is tails you toss it ...
*Friday, October 31, 2008 at 7:42pm by brianne*

**pre-cal **

aj uses a lingshot to launch a rock straight up from the a point of 6 ft. above ground level with an initial velocity of 170 ft per second. A) find an equation that models the height of the rock t seconds after it is launched. b) what is the maximum height of the rock and when...
*Wednesday, October 24, 2012 at 10:08am by jhon avendano*

**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 students on a balcony uses a slingshot to shoots rock straight up at 29.4 m/s. If the rock takes 8.0 s seconds to hit the ground below the balcony, how high is the balcony above the ground?
*Thursday, January 20, 2011 at 10:24pm by Anonymous*

**Physics**

Upon spotting an insect on a twig overhanging water, an archer fish squirts water drops at the insect to knock it into the water. Although the insect is at distance d from the fish along a straight-line path at angle $ (as in the figure here), a drop must be launched at a ...
*Monday, September 13, 2010 at 9:27pm by Antonio*

**Pre-Ap Physics**

A rock is projected from the edge of the top of a building with an initial velocity of 16.3 m/s at an angle of 39 ◦ above the horizontal. The rock strikes the ground a horizontal distance of 90 m from the base of the building. The acceleration of gravity is 9.8 m/s 2. ...
*Monday, September 24, 2012 at 9:35pm by Maria*

**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**

You are standing at the foot of the Bank of America building in San Francisco, which is 52 floors (237 m) high. You launch a ball straight up in the air from the edge of the foot of the building. The initial vertical speed is 70 m/s. a. How high up does the ball go? b. How ...
*Sunday, August 26, 2012 at 5:37pm by Sara*

**Physics**

A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of gravity is 9.8 m/s^2.(...
*Tuesday, November 1, 2011 at 4:29pm by Julia*

**science**

If you toss a coin five times and it lands heads up each time, can you expect the coin to land heads up on the sixth toss? Explain. Please help! Thanks!
*Tuesday, November 27, 2012 at 8:01pm by sam*

**AP Physics**

A rock thrown straight up with a velocity of 30 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 47 m/s when it strikes the ground. How tall was the building? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m.
*Tuesday, August 24, 2010 at 5:59pm by Alex*

**math**

Chance of not getting heads: 1) Toss # 1: 1/2 2) Toss # 2: 1/2 3) Toss # 3: 1/2 1/2 * 1/2 * 1/2 = 1/8 So I think the probability would be 1/8.
*Monday, February 25, 2013 at 6:33pm by Lena*

**Physics**

I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the maximum height reached...
*Thursday, February 10, 2011 at 11:35pm by Cecille*

**Physics**

I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the maximum height reached...
*Saturday, February 12, 2011 at 4:03pm by Cecille*

**physics**

A child standing on the edge of a sheer cliff wall throws a rock down towards the ground below. The rock is thrown 67° below the horizontal at a speed of 22 m/s & lands 43 m from the base of the cliff wall. Ignore air drag. A.) Determine how long the rock was in the air. s B...
*Thursday, September 6, 2012 at 3:15pm by Cindy*

**Physics...help please!**

I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the maximum height ...
*Friday, February 11, 2011 at 3:46pm by Cecille*

**PHYSICS**

A rock is dropped from rest into a well. The sound of the splash is heard 2.40 s after the rock is released from rest. (a) How far below the top of the well is the surface of the water? The speed of sound in air (at the ambient temperature) is 336 m/s. (3p) (b) What If? If the...
*Friday, September 24, 2010 at 1:37am by JULIET*

**Physics**

A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 40.0 m due east. Path 2 is 170.0 m due south. Path 3 is 120.0 m 30.0° south of west. Path 4 is 190.0 m 60.0° north of west. At the end of the walk, what is the person's ...
*Monday, September 17, 2012 at 3:49pm by David*

**Science**

Ok so I have to use kinematic equations to solve these. But I make like a X and Y chart Ex...X|Vix=2.89 dx=? t=? Y|Viy=0 dy=3.7 and so forth. 1. A cliff diver strikes the water 10.3 meters from a cliff 25 meteres high. At what horizontal speed did he leave the cliff? 2. A ball...
*Sunday, October 28, 2007 at 8:10pm by Andrew*

**Math**

A landscaper is designing a garden with hedges through which a straight path will lead from the exterior of the garden to the interior. If the polar coordinates of the endpoints of the path are (20, 90°) and (10, 150°), where r is measured in feet, what is the equation for the...
*Tuesday, September 6, 2011 at 10:47pm by Andrew*

**phy**

A baseball is hit nearly straight up into the air with a speed of 24 m/s. (a) How high does it go? (b) How long is it in the air?
*Thursday, August 26, 2010 at 3:48pm by ami*

**Physics**

Bryan tosses a 75.0 g rock into the lake. The rock leaves hus hand at a height of 175 cm above the ground travelling at 19.0 m/s. How high above the ground will the rock travel if it is accidentally thrown straight up? How high above the water will it travel if it is thrown in...
*Thursday, January 16, 2014 at 8:56pm by Holly*

**Physics -- check answers**

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 5:36pm by Lisa*

**physics**

In the first instance you are minimizing your flow of energy from your energy source, for example your fuel tank. The meaning of conservation of energy in physics is that in a physical process the total amount of energy does not change. However it may become quite useless to ...
*Thursday, August 26, 2010 at 4:18pm by Damon*

**Physics -- check answers please**

ed by Lisa on Sunday, February 23, 2014 at 6:39pm. 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 Hmmm. force*distance=work force=work/distance=40/8 N 4. Two objects have the same mass. One ...
*Sunday, February 23, 2014 at 6:39pm by bobpursley*

**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**

A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 30.0 m due east. Path 2 is 200.0 m due south. Path 3 is 140.0 m 30.0° south of west. Path 4 is 170.0 m 60.0° north of west. At the end of the walk, what is the person's ...
*Thursday, November 1, 2012 at 5:36pm by Mel*

**physics**

Bob shoots an arrow straight up into the air at 78.5 m/s. 1)What is the maximum height of the arrows flight? 2)How long is it in the air?
*Monday, October 1, 2012 at 4:33pm by kadeem*

**Physics**

It's a property of light called refraction. When light enters the water, it can't move as fast and it has to slow down slightly. It's kind of like how if you are walking, you can walk at a normal speed but if you walk in water, you can't walk quite as fast. If light from the ...
*Friday, January 30, 2009 at 5:44pm by tee*

**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 **

You are standing at the top of a deep, vertical cave and want to determine the depth of the cave. Unfortunately, all you have is a rock and a stopwatch. You drop the rock into the cave and measure the time that passes until you hear the rock hitting the floor of the cave far ...
*Sunday, September 30, 2012 at 10:51pm by Arya *

**Physics**

While visiting Planet Physics, you toss a rock straight up at 15 and catch it 2.4 later. While you visit the surface, your cruise ship orbits at an altitude equal to the planet's radius every 240 min . What is the mass of Planet Physics? Express your answer using two ...
*Monday, April 5, 2010 at 11:03pm by Adam*

**chemistry**

Limestone fizzes when an acid is added. Dilute acids can break up this rock in the open. what is the name of of the process of breaking up a rock using a chemical like this acid? name another rock, which could be broken up by the same process.
*Friday, February 22, 2008 at 2:58pm by tash*

**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*

**physics**

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to (1pts)
*Wednesday, June 12, 2013 at 10:10pm by Anonymous*

**physics**

A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of gravity is 9.8 m/s^2.(...
*Tuesday, November 1, 2011 at 3:32pm by Julia*

**science**

A rock is thrown vertically upward with an initial speed of 100 ft/s. At the same instant another rock is thrown vertically downward from the top of a 280 ft cliff with an initial speed of 40 ft/s. Neglecting air friction,
*Wednesday, January 9, 2013 at 6:45am by Anonymous*

**physics**

a 100 kg boulder is placed under the surface of water. its volume is 0.5 x 10^5 cm^3. what is the weight of the rock while under water; compare that to the weight of the rock in air (sitting on the ground) i just found the weight of the rock in air by multiplying 100 kg by 9.8...
*Tuesday, March 16, 2010 at 7:40pm by john*

**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**

Start by translating the question into "physics language:" "If the rock is thrown up at time t=0, what is the time, t1, when the rock hits the water. You can use the usual equation x = 1/2 a t^2 + v0 t + x0. v0 = 21 m/sec and x0=41 meters (taking x=0at the water surface) That ...
*Tuesday, September 4, 2007 at 9:51pm by Dooley*

**math **

A ball is shot straight up into the air with initial velocity of 45 ft/sec. Assuming that the air resistance can be ignored, how high does it go?
*Monday, October 4, 2010 at 9:15pm by Rebecca*

**Calculus**

A ball is shot straight up into the air with initial velocity of 47 ft/sec. Assuming that the air resistance can be ignored, how high does it go?
*Wednesday, February 2, 2011 at 12:32pm by Anonymous*

**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 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*

**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**

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**

An arrow is shot straight up in the air with speed of 20m/s. How long is t in the air? How high will the arrow rise?
*Wednesday, January 27, 2010 at 5:30pm by Jake*

**Physics**

An arrow is shot straight up in the air with speed of 20m/s. How long is t in the air? How high will the arrow rise?
*Wednesday, January 27, 2010 at 6:33pm by Jake*

**physics**

A rock is suspended by a light string. When the rock is in air, the tension in the string is 43.8 . When the rock is totally immersed in water, the tension is 26.2 . When the rock is totally immersed in an unknown liquid, the tension is 18.8 .
*Friday, May 31, 2013 at 8:00pm by lungani*

**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*

**English**

1. The next batter hit the ball straight up into the air. I jumped and made the catch. 2. The next batter hit the ball straight up into the air. I jumped and made a catch. 3. The next batter hit the ball straight up into the air. I jumped and caught. 4. The next batter hit the...
*Saturday, May 23, 2009 at 1:58am by John*

**Determining Probabilities**

Now really, which do you think? The theoretical probability of heads in a coin toss is .5 If you toss it 100 times are you not more likely to get closer to .5 on the average than if you toss it ten times? How likely are you to toss ten heads in a row? How likely are you to ...
*Tuesday, February 18, 2014 at 1:42pm by Damon*

**Physics**

Ball A is thrown straight down off the top of a tall building with an initial velocity of 20m/s. Ball b is thrown straight up from the top of the same building with initial velocity of 20 m/s. Which ball, if either, experiences the greater acceleration after leaving the ...
*Friday, February 7, 2014 at 3:21pm by Chris*

**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*

**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*

**physical science**

a soccer player kicks a ball straight up into the air at 6 m/s.ignore air resistance.what is the velocity of the ball at its highest point?
*Monday, January 23, 2012 at 2:51pm by faith*

**physical science**

a soccer player kicks a ball straight up into the air at 6 m/s.ignore air resistance.what is the velocity of the ball at its highest point?
*Monday, January 23, 2012 at 2:59pm by faith*

**physical science**

a soccer player kicks a ball straight up into the air at 6 m/s.ignore air resistance.what is the velocity of the ball at its highest point?
*Monday, January 23, 2012 at 3:01pm by faith*

**physics**

With what minimum speed must you toss a 160 ball straight up to hit the 15 -high roof of the gymnasium if you release the ball 1.7 above the ground? Solve this problem using energy.
*Monday, October 12, 2009 at 1:28am by Dan*

**Physics**

display.cgi?id=1225682948 I'm still confused about how you got the (1/8)kx^2 and how to find the weight's maximum height at the top of its path through the air.
*Monday, November 3, 2008 at 8:25am by Bertrand*

**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*

**Earth Science**

1. In the classroom during a visual inspection of a rock, a student recorded four statements about the rock. Which statement about the rock is an observation? (1)The rock formed deep in Earthâ€™s interior. (2)The rock cooled very rapidly. (3)The rock dates from the Cambrian ...
*Wednesday, June 18, 2008 at 12:54pm by Anonymous*

**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*

**Physics**

A 3 kg ball is dropped from the top of a cliff. At the same time, a 9 kg ball is fired straight down from the top of the cliff. Ignoring air resistance, what can we say about their accelerations after being released?
*Thursday, November 4, 2010 at 3:03pm by Zaphod*

**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 13.5 m/s and measures a time of 21.8 s before the rock returns to his hand. What is the acceleration due to gravity on this planet? (...
*Sunday, January 15, 2012 at 4:58pm by Jen*

**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 + 15.5 m/s and measures a time of 13.9 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due...
*Monday, June 17, 2013 at 12:22pm by louis aaaa*

**physics**

A rock is dropped. How fast will the 5.0 kg rock be traveling in 4.0s if a 5.o N force of air resistance acts on it?
*Thursday, December 16, 2010 at 9:04pm by Nate*

**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 HELP PLEASE!**

Vx = 25 cos 50 Vyi = 25 sin 50 (the little i means initial) Time in the air is determined entirely by the vertical problem. It starts up with initial velocity Vyi = 25 sin 50 It slows down and stops at the top due to gravity v = Vyi - g t = 0 at top so t at top = Vyi/g time in...
*Thursday, January 12, 2012 at 9:12pm by Damon*

**Physics**

shoot straight at the target with a little up angle for drop or shoot almost straight up so it gets the target on the way down. There are two solutions for the equations that yield time for given height of target. ( Fire the ball or lob it :) Vi = Vo sin T u = Vo cos T v = Vi...
*Monday, February 17, 2014 at 6:52pm by Damon*

**irsc**

a 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. if the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
*Wednesday, March 26, 2014 at 8:28pm by Anonymous*

**Physics**

whoops sent it without the options; they are: The path of the light is bent toward the normal. The path of the light is bent away from the normal. The path of the light is parallel to the normal. The path of the light is straight without any bends.
*Saturday, February 2, 2013 at 9:40pm by ............*

**physics**

a rock is dropped from the top of diving platform into the swimming pool below. will the distance traveled by the rock in a 0.1 second interval near the top of the flights be the same as the distance covered in a 1.1 second interval just before it hits the water? Explain?
*Thursday, February 24, 2011 at 9:52am by jb*

**earth**

#40 which type of rock is a result of a rock changing by heat and pressure? a. metamorphic rock b. igneous rock c. sedimentary rock d. metal ores
*Sunday, January 13, 2013 at 3:49pm by ?*

**Physics**

There is no horizontal force on the ball. So why would its horizontal velocity change? It does not, until it hits the ground or is headed or kicked. u =30 cos 30 Q : How long is it in the air? A : Twice as long as it takes to stop moving up at the top of its trajectory Q : How...
*Sunday, January 29, 2012 at 3:18pm by Damon*

**physics**

A spring-loaded toy dart is used to shoot a dart straight up in the air, and the dart reaches a maximum height of 16m. The same dart is shot straight up a second time from the same gun, but this time the spring is compressed only half as far before firing. How far up does the ...
*Wednesday, March 21, 2007 at 3:48pm by Jean*

**physics**

Can an object's velocity change direction when its acceleration is constant? a) No this is not possible because it is always speeding up b) No this is not possible because it is always speeding up or always slowing down, but it can never turn around c) Yes it is possible and ...
*Monday, October 15, 2007 at 4:39pm by Tammy*

**Physics**

A rock thrown from a bridge hits hte water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. a. Show that the virtical distance of the bridge above water is 1/2gt^2. b. What is the height of the bridge if ...
*Sunday, July 17, 2011 at 12:53am by Allen*

**physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.0 m/s via ...
*Friday, February 22, 2013 at 2:39pm by A*

**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*

**Math**

Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by the following equation. h = -16t2 + 34t + 15. How long does a team captain have to ...
*Friday, September 28, 2012 at 6:49pm by Mark*

**Physics**

Example 1: (Rock A) is thrown against a larger stationary rock(Rock B). considering the following possibilities... 1. Rock A bounces off of Rock B 2. Rock A splits into two pieces off of Rock B 3. Rock A explodes into many pieces off of Rock B What factors are affecting the ...
*Friday, November 8, 2013 at 3:53pm by Cole*

**physics**

A rock thrown horizontally from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. A.) Show that Therapy vertical distance of the bridge above water is 1/2gr2. B.) What is the height ...
*Thursday, March 29, 2012 at 11:56pm by liz*

**Physics**

A spring-loaded toy gun is used to shoot a ball of mass m=1.5 kg straight up in the air. The spring has spring constant k=667 N/m. If the spring is compressed a distance of 25.0 centimeters from its equilibrium position and then released, the ball reaches a maximum height (...
*Sunday, October 17, 2010 at 7:22pm by Nikohl*

**Physics**

A spring-loaded toy gun is used to shoot a ball of mass m=1.5 kg straight up in the air. The spring has spring constant k=667 N/m. If the spring is compressed a distance of 25.0 centimeters from its equilibrium position and then released, the ball reaches a maximum height (...
*Sunday, October 17, 2010 at 9:48pm by Eden*

**physics**

Newtons first law: it continues in a straight path, or in the direction it was moving at the time of release. That path is tangent to the circle it was moving in.
*Friday, March 19, 2010 at 11:26am by bobpursley*

**Physics**

An airplane whose air speed is 620km/h is supposed to fly in a straight path 35 degrees north of east. A steady 95km/h wind is blowing from the north. In what direction (angle) should the plane head?
*Friday, September 28, 2012 at 7:10pm by kacey*

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