Tuesday

April 21, 2015

April 21, 2015

Total # Posts: 1,964

**Physics**

A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by x=3m/s y=4m/s, where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component of th ...
*April 2, 2009*

**Chemistry**

What is the Lewis dot structure for LiF? Is it Li - F with 2 dots on each side of F?
*April 2, 2009*

**Chemistry**

What is the Lewis dot structure for LiH? Is it simply Li - H?
*April 2, 2009*

**Physics**

A sled that has a mass of 8.8kg moves horizontally at 20 km/h. When it passes under a bridge 13kg of snow drops ontothe sled. What is its subsequent speed? Isn't this in inellastic collision equation. I used (m1v1)+(m2v2)=(m1+m2)(vf) m1=8.8kg v1=20km/h m2=21.8kg v2=0km/h I...
*April 2, 2009*

**Physics**

A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by v=3(i hat)+4(jhat), where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component ...
*April 2, 2009*

**4th grade-English**

It will only be a day's drive to reach the mountains. Would mountains have 's or would it just be mountains?
*April 1, 2009*

**Physics**

Do i do this by k=1/2mv^2 If so what wll be my m and v then
*March 30, 2009*

**Physics**

Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.
*March 30, 2009*

**Physics**

The escape speed from a planet of mass 2.5×10^24 is 7.0 km/s.What is the planet's radius? Iam using the formula v=sqr(2GM/r) v=7 G=6.67*10^-11 M=2.5*10^24 r=? I get 6.8*10^12 Where did I go wrong?
*March 30, 2009*

**Physics**

The escape speed from a planet of mass 2.5×10^24 is 7.0 km/s.What is the planet's radius? Iam using the formula v=sqr(2GM/r) v=7 G=6.67*10^-11 M=2.5*10^24 r=? I get 6.8*10^12 Where did I go wrong?
*March 29, 2009*

**Physics**

Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.
*March 29, 2009*

**Physical Geology**

What is one thing that humans get from each of the spheres? The spheres are the biosphere, atmosphere, hydrosphere, and lithosphere.
*March 25, 2009*

**cultural diversity**

what are the most significant similarities between the chinese american and japanese american (cultural) experiences? what are the differences? topic relative lifestyle success in the United states
*March 24, 2009*

**Physics**

In a railroad yard, a 2.0×104 kg boxcar moving at 10m/s is brought to a stop by a spring-loaded bumper mounted at the end of the level track. If the spring constant 1.7 MN/m , how far does it compress in stopping the boxcar? What do i do?
*March 20, 2009*

**Physics**

A 17mlong vine hangs vertically from a tree on one side of a 10 m wide gorge, as shown in the figure. Tarzan runs up, hoping to grab the vine, swing over the gorge, and drop vertically off the vine to land on the other side. At what minimum speed must he be running. I do 17^2+...
*March 20, 2009*

**Physics**

The escape speed from a planet of mass 2.5×1024 kg is 7.0 km/s .What is the planet's radius? I amusing v=sqr(2GM/r) For G I am using 6.67*10^-11 and for M do I use 5.97*10^24
*March 20, 2009*

**Physics**

What do you mean by the kinetic energy it hasn't given me anything
*March 20, 2009*

**Physics**

Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. do i use the formula U=-GMm/r I get 290 MJ?
*March 20, 2009*

**Physics**

Two meteoroids 250,000 km from Earth are moving at 2.1 km/s. Meteor one is headed in a straight path for Earth, while meteor two is on a path that will come within 8500 km from the Earth's center. (A) What is the speed of the first meteroid when it strikes Earth. (B) What ...
*March 19, 2009*

**Physics**

The hockey captain, a physics major, decides to measure the speed of the hockey puck, He loads a small styrofoam chest with sand, giving it a total mass of 6.4 kg. He places the chest and embeds itslef in the styrofoam. The chest moves off at 1.2 m/s. What was the puck's ...
*March 18, 2009*

**English III**

What is the theme of follow the poem Follow the Drinking Gourd? Give examples.
*March 18, 2009*

**physics**

Two meteoroids 250,000 km from Earth are moving at 2.1 km/s. Meteor one is headed in a straight path for Earth, while meteor two is on a path that will come within 8500 km from the Earth's center. (A) What is the speed of the first meteroid when it strikes Earth. (B) What ...
*March 17, 2009*

**stats**

Data on number of days of work missed and annual salary increase for a company's employees show that in general exployees who missed more days of work during the year received smaller raises than those who missed fewer days. A detailed analysis showed that number of days ...
*March 11, 2009*

**stats**

Data on number of days of work missed and annual salary increase for a company's employees show that in general exployees who missed more days of work during the year received smaller raises than those who missed fewer days. A detailed analysis showed that number of days ...
*March 11, 2009*

**Financial Management**

You have to consider that rarely in life is there a free lunch. If the stock did not drop on an ex-dividend date, all else held constant, you could purchase the stock for the ex-dividend date; collect the dividend; then sell the stock at your purchase price, thus netting the ...
*March 9, 2009*

**chem**

Some biphenyl(C6H5--C6C5) is produced as a by-product in the synthesis of benzoic acid . where does this come from?
*March 9, 2009*

**Algebra**

The formula's are not posting but I have solved the questions. I just need to know how I determine how the equation is undefined. 1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by a. What is the cost to remove 75% of the pollutant? b. ...
*March 8, 2009*

**Algebra**

The cost, in millions of dollars, to remove x % of pollution in a lake modeled by What is the cost to remove 75% of the pollutant? 6000/¨€(200-2(.75)@$30.23 million) What is the cost to remove 90 % of the pollutant? 6000/¨€(200-2(.90)@$30.27 million) What is...
*March 8, 2009*

**Algebra**

I have an assignment due tonight and I believe I have solved it all correctly until I come to part d of the question. "For what value is this equation undefined?" How do I determine this? The Environment Environmental and wildlife preservation ensures future ...
*March 8, 2009*

**cultural diversity**

Complete the following matrix by identifying 7 to 10 leaders or legislative events from both the Civil Rights and Black Power movements. The first leader is provided as a model.
*February 28, 2009*

**College Level Probability**

Four different written driving tests are administered by the Motor Vehicle Department. One of these four tests is selected at random for each applicant for a driver's license. If a group of 5 applicants (consisting of 2 women and 3 men) apply for a license, what is the ...
*February 23, 2009*

**math again**

How does "How many gallons of a 12% indicator solution must be mixed with a 20% indicator solution to get 10 gal of a 14% solution?" turn into ".12x + .2(10+ -1x) = .14(10)"?? Please, I need to understand how it works! Thank you.
*February 22, 2009*

**math**

Thank you so much, I am very grateful.
*February 22, 2009*

**math**

How many gallons of a 12% indicator solution must be mixed with a 20% indicator solution to get 10 gal of a 14% solution?
*February 22, 2009*

**History**

Where can I find a copy of the Declaration of Independence?
*February 20, 2009*

**History- sue**

why do you think he meant all white men?
*February 20, 2009*

**History**

How should the phrase, "All men are created equal" be understood today, and why? What do you think Thomas Jefferson meant when he wrote these words in the Declaration of Independence in 1776, and why?
*February 20, 2009*

**history**

why, after 1765, did the American colonists increasingly find British imperial rule unacceptable? What had changed -- and why?
*February 19, 2009*

**Calc help**

find the area of the region enclosed by y=e^2x, y=e^5x, and x=1. i am having trouble seeing how this region looks like and having problems with how to start the problem in general. Much help is appreciated.
*February 19, 2009*

**Humanities**

i have to find the number of hajj pilgrims from a country (besides america)annually. right now, im finding the number of hajj pilgrims from Indonesia in the year 1999-2004 and i cant find any good websites on it....any info or links that is related to the number of pilgrims ...
*February 18, 2009*

**factoring**

factor this problem w^2 + w - 12 is my answer right? (w-2)(w+2)
*February 16, 2009*

**chem**

Make sure your equation is [b +-(b^2 - 4ac)^(1/2)]/2a
*February 15, 2009*

**Pre-calculus**

1 D. 2 C. 3 A.
*February 8, 2009*

**Algebra**

-7x+-3
*February 6, 2009*

**Math**

Maximum: 57 Minimum: 50 Median: 54 Mode: 56 Give 12 sets of numbers using the above senarios?? Please Help!!
*February 3, 2009*

**statistics**

how do i prove that the angle between a tangent and a radius is 90 degrees?
*February 3, 2009*

**To James -- AED 200**

Thank you for your suggestion. I ended up finding a game on the internet that I was able to incorporate into my project and wrote my paper about it. Thank you for your help.
*February 1, 2009*

**To James -- AED 200**

I am sorry I have never used this before. I was just thinking if I could get help with some brainstorm type ideas I could look into a technology and devise something I could learn in the classroom. I was thinking about English language learners and maybe some kind of ...
*February 1, 2009*

**Chemistry**

Please do it i dont have all the materials and i need to do it today. PLEASE!!
*February 1, 2009*

**Geography**

Explain why the importance of water quality should be a concern for every South Africa?
*January 30, 2009*

**Geography**

Grade12 geography data handling answers for 2015
*January 30, 2009*

**CHEM URGENT**

Infrared, ultraviolet, and visible radiation are all part of the electromagnetic spectrum. Arrange the three types of radiation in order of increasing energy.
*January 17, 2009*

**Geometry**

This problem can not be answered without the diagram. Sorry.
*January 12, 2009*

**English**

Where can I find an example of an argumentative essay on the Internet?
*January 11, 2009*

**Nutrition**

A pair of nutrients ( one mineral and one vitamin) that works together in the body.
*January 9, 2009*

**Math**

How can I write this as an algebraic expression: twice as old as Max's age a, less three years.
*January 8, 2009*

**algebra**

What is the slope-intercept form of an equation for the line that is parallel to 5x-3y=1 and passes through (0,-4)?
*January 5, 2009*

**space**

choose five elements of the universe and tell why they are amazing and wonderous
*December 16, 2008*

**8th grade math**

50 liters in 4 minutes
*December 15, 2008*

**French**

How do you say, "I've been friends with him since I was two?" in french? I know it's pretty simple, but I can't seem to remember... >.<
*December 15, 2008*

**Math**

What is the probability of obtaining at least one tail when a coin is flipped six times?
*December 12, 2008*

**advanced functions HELP!!!**

the function S(d)=93logd+65 relates the speed of the wind, S, in mile per hour, near the centre of a tornado to the distance that the tornado travels, d, in miles. a)Calculate the avg. rate of change for the speed of the wind at the centre of a tornado from mile 10 to mile 100...
*December 10, 2008*

**aadvanced functions HELP!**

nope i don't, the school makes it manditory to take advanced functions before calculus
*December 10, 2008*

**aadvanced functions HELP!**

the population of a town is decreasing at a rate of 1.8% per year. The current population of the own in 12000. a)write and equation that models the population of the town b)how long will it take for the population to decline to one quarter of its current population? c)...
*December 10, 2008*

**advanced functions HELP!!!**

(rate 5+ rate 8) / (15-8) ? t is measured in hours
*December 10, 2008*

**advanced functions HELP!!!**

Radioactive decay is the process by which an unstable element transforms into different element, typically releasing energy as it does so. For 500g of a radioactive substance with a half-life of 5.2 hours, the amount remaining is given by the formula M(t)=500(0.5) ^ t/5.2 a) ...
*December 10, 2008*

**Foreign Languages**

listen carefully and try to understand. Don't react like the speaker is talking to you, just listen him.
*December 4, 2008*

**chemistry**

how would you do the Empirical And Molecular formula stuff i got three elenments that are Carbon with 78.23% , Hydrogen with 6.56% , and Nitrogen with 15.21%
*November 21, 2008*

**CALCULUs**

For all x in the interval [-11,13] the function f is defined by x^3(x+3)^4 On which two intervals is the function increasing? Find the region in which the function is positive
*November 21, 2008*

**science**

what is the atomic structure for potassium
*November 19, 2008*

**social studies**

Radical Republicans believed that former slaves should _______________. be granted citizenship but cannot vote? is that correct? thanks in advance.
*November 18, 2008*

**social studies**

In 1867 What did Congress decide about the southern states that ad not been readmitted to the union? Was it that they were supervised by military officers? thanks
*November 18, 2008*

**Physics please help**

Calculate the force required to pull a copper ball of radius 3.00 cm upward through a fluid at the constant speed 7.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force.
*November 17, 2008*

**Trig - Identies/equation, please help!**

I get this now!!, Thanks!!!, i guess i should study now.
*November 12, 2008*

**Trig - Identies/equation, please help!**

the ΘЄ[0°, 360°) was suppose to mean its 0° < or = Θ < 360°
*November 12, 2008*

**Trig - Identies/equation, please help!**

2Sin(Θ+47°)=1 ΘЄ[0°, 360°) What I did: Sin(Θ+47°)=1/2 Sin 1/2 = Θ+47° 30°+360 = Θ+47° 343° = Θ Ok, so how do i find the other solutions? In this problem its 103°. I think we were suppose to do something ...
*November 12, 2008*

**french**

Fixed up all the accents... hey, Mme, maybe you might wanna check out that problem... cuz im getting all these wierd characters where the accents are supposed to be. Venez voyez = Venez voir Because the French word "la chance" usually means "luck," it would...
*November 12, 2008*

**geography**

Define Commerical, Specialized and Subsistence Agriculture
*November 12, 2008*

**french**

ugh, all the accents are screwed up... here's the fixed version i hope it works >.< Thank you for using the Jiskha Homework Help Forum. Always try to write using the structures and vocabulary you have used. Sometimes, if you do NOT provide the English of what you are...
*November 11, 2008*

**ETH/125**

I am an Axia student also. I am still looking for different measurments of prejudice.
*November 10, 2008*

**french**

C'est genial. Bon Felicitations
*November 10, 2008*

**chemistry**

Triple Point Clicker Challenge The Lewis structure for nitroglycerin is shown below. 1.00 mL of liquid nitroglycerin is placed in a sealed, reinforced, insulated steel box measuring 1.00 m on each side and filled with argon gas at 15.0 oC and 1.00 atm. The density of ...
*November 10, 2008*

**OChem**

1. Why does not fluorene dissolve in 1.5M sodium hydroxide solution? 2. What experimental difficulty would you encounter if you had neclected to include a drying step before evaporating the ether solution of the neutral organic compound (fluorene)?
*November 4, 2008*

**chemistry**

an auto mechanic spills 85 mL of 2.4 M H2SO4 solution from a rebuilt auto battery. how many mL of 1.2 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?
*November 3, 2008*

**chemistry**

if 24.25 mL of a standard M NaOH solution is required to neutralize 26.00 mL of H2SO4, what is the molarity of the acid solution?
*November 3, 2008*

**chemistry**

How many total moles of ions are released when each of the following samples dissolves completely in water? ? 3.70g of CuSO4 5H2O
*October 31, 2008*

**Math**

write 109 3/4 as a decimal write 0.3246 as a percent
*October 25, 2008*

**Math**

Identify the rate in the following statement: 75 is 15% of 500 A) 75 B) 500 C) 15%
*October 25, 2008*

**Math**

The electricity costs of a business increased from $18,000 one year to $19,000 the next. To the nearest whole percent, what was the rate of increase?
*October 25, 2008*

**Organic Chemistry**

--Why does caffeine have a larger Rf value than chlorophyll? --If two compounds have the same Rf under identical conditions. Does this show that they have identical structures? Explain.
*October 23, 2008*

**math**

oops i mean open toad.
*October 20, 2008*

**math**

Open Toed. The joke answer is open toed sandals but for the pizzazz is the first one.
*October 20, 2008*

**College Chemistry**

A 2.80 -g sample of an unknown chlorofluorocarbon is decomposed and produces 557mL of chlorine gas at a pressure of 750mm Hg and a temperature of 298K . What is the percent chlorine (by mass) in the unknown chlorofluorocarbon?
*October 16, 2008*

**differential equations**

dy/dx=(9+20 x)/(xy^2)
*October 8, 2008*

**science**

what is an ion
*October 6, 2008*

**algebra**

give the slope for the following lines: y+2=0 and x-3=0
*October 5, 2008*

**thermochem**

An unknown volume of water at 18.2°C is added to 27.0 mL of water at 36.7°C. If the final temperature is 23.5°C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
*October 5, 2008*

**chemistry help**

A 265 g aluminum engine part at an initial temperature of 2.00°C absorbs 84.5 kJ of heat. What is the final temperature of the part (c of Al = 0.900 J/g·K)?
*October 5, 2008*

**thermochemistry**

Calculate the amount of heat liberated (in kJ) from 374 g of mercury when it cools from 83.7°C to 19.1°C.
*October 5, 2008*