Thursday

December 18, 2014

December 18, 2014

Number of results: 51,522

**physics**

a person of mass 80 kg standing on a boat of mass 320 kg which at rest in still water the person is initially 12m from the shore the person walk on boat for 6 sec with a constant speed 1 m/s toward the shore and then stop distance of the person from the shore finally
*October 18, 2014 by anjali*

**physics**

A person weights 685 N in air but only 497 N when standing in water up to the hips. Find (a) the volume of each of the person’s legs and (b) the mass of each leg, assuming they have a density that is 1.05 times the density of water.
*March 25, 2013 by Jess*

**Physic**

A person weighs 872 N in air and has a body fat percentage of 20.7%. a. What is the overall density of this person's body? b. What is the volume of this person's body? c. Find the apparent weight of this person when completely submerged in water.
*April 18, 2010 by Ann*

**physics-buoyancy**

Use Archimedes' law of buoyancy. - to calculate what fraction of the volume of an iceberg floating in the ocean is above the water level. -how many 20kg penguins can be supported by a 1000 cubic meter iceberg that is on the verge of being completely submerged?
*May 8, 2011 by jen*

**physics**

A person is standing at the edge of the water and looking out at the ocean. The height of the person's eyes above the water is h = 1.6m. and the radius of the earth is R = 6.38 X 10^6 m. (a) How far is it to the horizon?
*September 14, 2010 by linda *

**AP Physics**

Hi im new so maybe one of you can help me understand this question, can't find it anywhere in the book. A person weighs 723N in air and has a body-fat percentage of 29.3% . What is the overall density of this person's body? What is the volume of this person's body? Find the ...
*December 3, 2009 by Danny*

**Physics**

Hi im new so maybe one of you can help me understand this question, can't find it anywhere in the book. A person weighs 723N in air and has a body-fat percentage of 29.3% . What is the overall density of this person's body? What is the volume of this person's body? Find the ...
*December 3, 2009 by Danny*

**physics**

an 800 N person stands on a scale in an elevator. What is his apparent weight when the elevator is accelerating upward at 2 m/s^2? B) what5 is his apparent weight when the elevator is acc. downward at 2m/s^2? c) what is his apparent weight when the elevator is moving downward ...
*February 20, 2007 by Sabrina*

**physics**

A person of mass 60 kg is standing on a raft of mass 40kg in a lake. The distance of a person from bank is 30m. If a person starts running towards bank with velocity 10m/s then his distance from bank after 1s will be ?? And explain with diagram and proper steps
*September 16, 2014 by saira*

**physics**

Persons A and B are standing on a board of uniform linear density that is balanced on two supports, as shown in the figure. What is the maximum distance x from the right end of the board at which person A can stand without tipping the board? Treat persons A and B as point ...
*April 10, 2011 by I need help*

**science**

A 20 N object displaces 2,000 mL of water. What is the buoyancy? Hint: 1 mL of water = 1 cm3 of water = 1 g of water (Remember to convert g to kg) Will it float? (yes/no)
*May 1, 2012 by Morgan*

**Physics**

A Ferris Wheel, 24.0 m in diameter, rotates once every 12.5s. What is the fractional change in a person's apparent weight: a) at the top, and b) at the bottom? I need to know if I'm doing this right. Here's my work: Equation Used: Net Force = [(4(pi)^2)(R)(M)] / [T^2] M=mass T...
*January 20, 2011 by Ricky*

**physics**

A man of mass 60kg standing inside a lift with an acceleration of 2m/s(square).Find the apparent weight that a man feels(g is 10).
*December 18, 2013 by joelinho*

**physics**

What is likely identity of a metal, if a sample has a mass of 67.5g when measured in air and an apparent mass of 59.5g when submerged in water?
*May 31, 2010 by fillemon*

**physics**

a ball of mass of 4kg,of density 4000kg/m3 is completely immersed in water of density 1000kg/m3.find the force of buoyancy.[g=10m/s2]
*October 23, 2012 by keerthiga*

**math**

A Ferris wheel 28.0m in diameter rotates once every 21.0s. What is the ratio of a person's apparent weight to her real weight at the top? What is the ratio of a person's apparent weight to her real weight at the bottom?
*October 2, 2009 by Confused*

**gr 12 physics**

A person standing at the edge of the water and looking out at the ocean/ The height of the person's eyes above water is h=1.6m. and radius of the earth is R=6.38x10^6m How far is it to the horizon. In other words, what is the distance d from the person's eyes to the horizon? ...
*September 13, 2010 by fan*

**Tech Math**

A 490 newton woman stands on a bathroom scale while riding in a elevator that is accelerating downward at 2m/sec/sec. Find her apparent weight and her apparent mass. Compare to her starting mass.
*July 19, 2012 by Jennifer*

**Physics**

You take a ride in a fast elevator to the top of a tall building and ride back down while standing on a bathroom scale. During which parts of the ride will your apparent and real weights be the same? During which parts will your apparent weight be less than your real weight? ...
*January 14, 2013 by Billy*

**Physics**

A balloon carrying a basket is descendign with a constant acceleration of g/3. the total mass of the basket and contents is mB.you see water below and decide you need to throuw out some mass to allow the basket to rise and not hit the water. how much mass should you throw out ...
*October 8, 2012 by Jane*

**Physics**

A 67.0 kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 5.50 m/s. At a time of 1.75 s after she enters the water, her speed is reduced to 1.10 m/s. What is the net average force (magnitude and direction) ...
*March 18, 2012 by Foxxi*

**physics**

A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 1.53 m/s 2 . The acceleration of gravity is 9.8 m/s 2 . If the person’s mass is 83.4 kg, what does the scale read?
*October 23, 2014 by Anonymous*

**physics**

A geologist finds that a Moon rock whose mass is 9.97 kg has an apparent mass of 6.40 kg when submerged in water. What is the density of the rock?
*January 24, 2012 by B*

**College Algebra 2**

The number of kilograms of water in the human body varies dirctly as the mass of the body. An 84-kg person contains 64-kg of water. How many kg of water is in a 63-kg person?
*September 25, 2011 by Francine*

**Physics Archimedes buoyancy lab**

In calculating the density of a heavy solid. The string holding the heavy solid will cause error. specific gravity= (mass object in air)/ (mass object in air- mass object in water) = density When does it lead to an experimental density that is too high? Too low? not sure...
*December 12, 2007 by ~christina~*

**Physics**

A rock weighs 140 N in air and has a volume of 0.00273 m3. What is its apparent weight when sub- merged in water? The acceleration of gravity is 9.8 m/s2 . Answer in units of N. If it is submerged in a liquid with a density exactly 1.9 times that of water, what will be its new...
*November 28, 2010 by Laura*

**physics**

A 65 kg diver jumps off of a 10.0 m tower. a. Find the diver's velocity when he hits the water. b. The diver comes to a stop 2.0 m below the surface. Find the net force exerted by the water. Ok, im confused, I found velocity which is 14. But for the net force im confused on ...
*December 24, 2009 by Heart*

**PHYSICS**

Fish achieve neutral buoyancy (so they don't have to swim constantly to stay in place) via a swim bladder. A swim bladder is a little internal sack that they can inflate/deflate with air, which changes their volume but not their total mass. To see how this allows them to ...
*October 21, 2013 by Saiba*

**Physics**

A person is standing on a spring bathroom scale on the ﬂoor of an elevator which is moving up and slowing down at the rate of 2.73 m/s^2. The acceleration of gravity is 9.8 m/s^2. If the person’s mass is 75.2 kg, what does the scale read? Answer in units of n
*September 24, 2012 by sam*

**physics**

find the apparent weight of a 18 cm by 12 cm by 6 cm block of concrete with a mass of 1.82 kg that is submerged under water.
*January 18, 2012 by james *

**Physics (Buoyancy)**

A Cuboid with lenght as 6m and breadth as 3m, is floating in a lake. A man comes and sits on it and it sinks 1cm, then find the weight of the man. (Take g=10 m/s -2)
*March 14, 2013 by Krishnam Kumawat*

**physics**

A 640 N student stands on a bathroom scale in an elebator. As the elevator starts moving, the scale reads 800 N. a) find the acceleration of the elevator (magnitude and direction) b) acceleration if the scale reads 450N? c) If the scale reads 0 should the student worry? ...
*November 16, 2006 by Christina*

**physics**

A person is standing at the edge of the water and looking out at the ocean (see the drawing). The height of the person’s eyes above the water is h=1.6 m, and the radius of the earth is R=6.38x10^6 m (use as a precise value). (1) How far is it to the horizon (in meters, use ...
*January 23, 2011 by Brittany*

**math**

When a person is swinging the amplitude (the swings"s distance above it's rest position) increases with each pump. According to Scientific magazine the amplitude increases by adding a constant when the person pumps sitting down, and by multiplying by a constant when the person...
*April 27, 2012 by John*

**8th grade**

What is the buoyancy force on a 15 g object which displaces 60 ml of water?
*August 16, 2010 by fernando*

**Physics**

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 220 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +3.5 m/s relative to the shore, and then hops onto an identical floating log that is ...
*February 9, 2011 by hy*

**algebra**

the number of kilograms of water in a human body varies directly as the mass of the body an 87kg person contains 58kg of water how many kilograms of water are in a 72-kg person
*December 13, 2011 by karon*

**PHSYICS 12 HELP PLEASE!**

Determine the specific gravity of a fish which masses 320g in air and has an apparent mass of 21g in water
*June 3, 2012 by VIJ*

**physics**

Bird bones have air pockets in them to reduce their weight–this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 43.0 g and its apparent mass ...
*April 10, 2014 by Paige*

**algebra/trig**

A person is standing 50meters away from a target whos center is 90cm off the ground. The height to the person's eyes is 66inches. Find the correct height for the target if the person is standing 4.5 meters from the target. I have tried a couples times to solve this problem and...
*April 3, 2009 by Riley*

**algebra**

The number of kilograms W of water in a human body varies directly to the mass of body. A 96-kg person contains 64 kg of water. How many kilograms of water are in a 60-kg person?
*June 10, 2013 by Anonymous*

**science**

How did Archimedias prove mathematically that salt water and diving were related to buoyancy?
*November 3, 2011 by Justin*

**Physics**

Buoyancy. A Team of 6 scouts plan to cross a lake on a raft they designed. The dimensions of each plank is 30 cm x 30 cm x 3m. The density of the wooden planks is of .80. The average mass of the members is 65KG. And for their safety they want the top of the raft to be 3 cm ...
*August 13, 2012 by Alex*

**physics**

A wooden cube with a specific gravity of 0.90 and side length 0.120 m is placed into a bucket of water and floats upright with its sides in a horizontal or vertical orientation. What is the mass of the cube, what is the buoyancy force acting on the cube and how much of the ...
*May 1, 2012 by Anonymous*

**Chemistry**

How much salt could an average person hold? (Ignore safety concerns) Given equation: 0.3x=y 0.3x meaning mass of water y mean mass of salt that could be dissolved in the given mass of water Assuming the average human body has 60-75% of water, let us just use 75% Solve.
*March 11, 2013 by Juan*

**physics**

A 53.0-kg person jumps from rest off a 12.0-m-high tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative
*July 10, 2013 by sal*

**physics**

a person standing on a moving escalator is moving relative to another person standing on the escalator true or false?
*October 14, 2012 by Anonymous*

**physics**

a 50 kg person is standing on mercury. mercury's mass is .0553 times the earths mass and has a radius of 2439 kilometers a. what is the persons weight on saturn b. what is the persons mass on saturn how do i solve this, i dont need the answers, just an explanation
*November 14, 2008 by kim*

**physics**

A female whose mass is 130 kilograms is standing on a scale in an elevator that has an initial downward velocity of 6 meters per second and is accelerating upward at 7 meters per second. What's the magnitude of the apparent weight indicated by the scale?
*May 24, 2012 by Jen*

**Science Density**

Water has a density of 1.0g/cm3. Aperson sits in a bath 150cm in length and 90 cm width. Thw water had a depth of 60cm befor the person sat in the bath. after sitting in the bath the water level rose to 68cm. Calculate the mass of the person, giving your answer in kg.
*October 22, 2014 by Jess*

**physics**

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
*February 19, 2012 by Harry*

**physics**

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
*February 20, 2012 by Joe*

**physics**

robin is standing terrified at the end of a diving board, which is high above the water. if robin has a mass of 75 kg and is standing .6m from the board's pivot point, what torque is robin exerting on the board
*April 22, 2014 by nicole*

**Physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 20 m/s. The cliff is h = 53 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? (b) With what speed does it strike the water?
*January 3, 2010 by Trisha*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h = 58 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? s (b) With what speed does it strike the ...
*October 11, 2011 by Emily*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 16 m/s. The cliff is h = 60 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? s (b) With what speed does it strike the ...
*December 13, 2012 by Anonymous*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 16 m/s. The cliff is h = 60 m above the water's surface, as shown below. How long does it take for the stone to fall to the water? With what speed does it strike the water?
*January 1, 2013 by Anonymous*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 m/s. The cliff is 52 m above the water's surface. How long does it take for the stone to fall to the water? With what speed does it strike the water?
*November 4, 2009 by Mari*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 14 m/s. The cliff is h = 39 m above the water's surface. (a) How long does it take for the stone to fall to the water? (b) With what speed does it strike the water?
*January 6, 2010 by Ashley*

**Physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 23 m/s. The cliff is h = 54 m above the water's surface. How long does it take for the stone to fall to the water? With what speed does it strike the water?
*January 14, 2010 by Alan Thomas*

**Honors Physics **

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 290 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +3.1 m/s relative to the shore, and then hops onto an identical floating log that is ...
*February 22, 2012 by Elizabeth *

**physics**

a person whos mass is 102 kg stands on a beam supported by two ropes , A and B, he is standing on one foot to help you solve this problem.what is the tension of the two ropes? the entire beam itself is 4.56 m and the person is stading from left to right in 1.59 m.
*October 26, 2009 by jonh*

**chemistry**

cold water mass of calimeter+ water: 68.66g mass of calimeter: 19.19g mass of water: 49.47g final temperature of water: 39.1C initial temperature of water: 25.5C delta(T) of water: 13.6C hot water mass of calimeter+ water: 79.55g mass of calimeter: 20.61g mass of water: 58.94g...
*November 30, 2011 by Yuli*

**Health**

We got a really weird question When a person goes and measured themselves on the medical beam scale, is it possible for them to stand in different places on the scale to weight less or more? (Ex. Standing on one door, left. Or standing on just right foot. Or standing more to ...
*August 21, 2014 by Lilly*

**physics**

A 62.7-kg person jumps from rest off a 2.98-m-high tower straight down into the water. Neglect air resistance. She comes to rest 1.09 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is ...
*November 28, 2011 by Yuli*

**physics**

Can you please help me with this question? A person is flying through space with person B exactly 186000 miles behind. When person A wants to accelerate, he uses a flashlight to signal person B.This means they accelerate together and remain exactly 186000miles apart. Person A ...
*January 22, 2011 by gayathri*

**Physics: Buoyancy**

A crane lifts the 23000 kg steel hull of a ship out of the water. Determine the following. (a) the tension in the crane's cable when the hull is submerged in the water
*January 27, 2013 by Seth*

**Physics: Buoyancy**

A crane lifts the 23000 kg steel hull of a ship out of the water. Determine the following. (a) the tension in the crane's cable when the hull is submerged in the water
*January 27, 2013 by Seth*

**physics**

A 0.52 kg piece of wood floats in water but is found to sink in alcohol (specific gravity = 0.79) in which it has an apparent mass of 0.040 kg. What is the SG of the wood?
*November 27, 2008 by completely lost!*

**Physics **

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 245 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.7 m/s relative to the shore, and then hops onto an identical floating log that is ...
*November 14, 2010 by Jeffrey *

**physics**

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 200 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +4.0 m/s relative to the shore, and then hops onto an identical floating log that is ...
*July 19, 2013 by Anonymous*

**physics**

A diver of mass 43.2 kg jumps off a high dive 10.0 m tall. If he comes to a stop 2.0 m below the surface of the water, what was his acceleration after he entered the water?
*October 5, 2011 by Kalyn*

**science**

look..i'm not really good in english..but i really2 need help here..why jellyfish must be in buoyancy of water group???
*October 10, 2009 by =)*

**physics**

a person whos mass is 102 kg stands on a beam supported by two ropes , A and B, he is standing on one foot to help you solve this problem.
*October 26, 2009 by vic*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
*December 3, 2012 by Caleb*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
*December 6, 2012 by Danny*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h=37 m above the water's surface, as shown below. With what speed does it strike the water?
*September 26, 2011 by Aidan*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*November 30, 2011 by Matt*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*November 30, 2011 by Jordan*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 55 m above the water's surface, as shown below. How long does it take for the stone to fall to the water?
*December 9, 2009 by andrew*

**physics**

A submerged submarine alters its buoyancy so that it initially accelerates upward at 0.325 m/s^2. What is the submarine's average density at this time? (Hint: the density of sea water is 1.025*10^3 kg/m^3). The difference of densities will give you the net bouyant force on the...
*May 9, 2007 by Anonymous*

**Chemistry **

A 1.516 M solution is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.
*November 4, 2014 by Anonymous*

**Physics**

Can someone help me with finding out the magnitude of the gravitational force a person with a mass of 67.5 kg would experience while standing on the surface of Earth? Thanx in advance.
*November 16, 2008 by Anonymous*

**physics**

A person jumps off a diving board 4.6 m above the water's surface into a deep pool. The person's downward motion stops 1.6 m below the surface of the water. Estimate the average deceleration (magnitude) of the person while under the water.
*January 9, 2012 by Anonymous*

**Physics**

John’s mass is 81.0 kg, and Barbara’s is 62.4 kg. He is standing on the x axis at xJ = +9.41 m, while she is standing on the x axis at xB = +4.34 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Distance moved ...
*November 7, 2012 by Orla*

**Physics review**

In this example, sound waves are created in a tube. The tube is partially filled with water and the level of water is adjusted in the tube until there is a standing wave. Draw the lowest frequency standing wave for the two water levels in the drawing. The drawing has two tubes...
*July 25, 2012 by hayley*

**Physics**

a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 10 m/s. the cliff is 48 m above the water's surface as shown. how long does it take for the stone to fall to the water? the acceleration of gravity is 9.81 m/s2. answer in units of s
*October 17, 2014 by Kenny*

**Chemistry please help **

A 1.516 M soltion is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.
*November 5, 2014 by Anonymous*

**PHYSICS**

Driving in your car with a constant speed of v = 11.7 m/s, you encounter a bump in the road that has a circular cross section, as indicated in the figure below. If the radius of curvature of the bump is r = 34.4 m, calculate the apparent weight of a 65.9 kg person in your car ...
*June 15, 2012 by Matthew Goldberg*

**physics**

In Example 5.8, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.80 s. It travels with this constant speed ...
*March 21, 2013 by Pritesh*

**physics**

A planet with a mass of 5.67E25 kg has a radius of 3.63E7 m. How much would a 89 kg person weigh on this planet if they were standing on the surface?
*February 11, 2011 by Anonymous*

**physics!**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18m/s. The cliff is 52m aboce the water's surface. How long does it take for the stone to fall to the water? With what speed does it strike the water? I got how long it took, but how ...
*December 9, 2008 by emily*

**Physics - Buoyancy**

A scale reads 20.3 N when an object is not submerged in water and 20.0 N when the object is (completely) submerged in water. What is the specific gravity of the object?
*November 11, 2010 by Phil*

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
*November 27, 2012 by Mark*

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
*December 13, 2014 by Frank*

**Science **

A diver standing on the diving board has a mass of 89.0 kg and has a gravitational potential energy of 2.50 x 103 J. Determine how high the diver is above the water surface. (Assume the water is at ground level).Use 9.81 m/s2 as the value for gravity.
*April 29, 2012 by JodyAnn*

**Physics**

John's mass is 92 kg, and Barbara's is 67 kg. He is standing on the x axis at xJ = +7.50 m, while she is standing on the x axis at xB = +2.50 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Answer in distance (m)
*October 22, 2012 by Elizabeth*

**physics**

What is the apparent weight of a 55 kg person in an elevator accelerating downward at 2.2 m/s2?
*January 20, 2014 by Marina*

**Dudas**

John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?
*October 29, 2014 by Ann*

**12th grade**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 13 m/s. The cliff 42 m above the water’s surface With what speed does the stone strike the water? Answer in units of m/s..
*October 27, 2010 by robert*

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