Friday

November 21, 2014

November 21, 2014

Total # Posts: 149

**Physics C**

A rifle is aimed horizontally at a target 100 ft away. The bullet hits the target .78in below the aiming point. a) What is the bullet's time of flight? b)What is its muzzle velocity? The answers should be a) 63 m/s b) 1.6 X 10 exponent 3 ft/s I don't know how to get to...
*November 18, 2014*

**science**

what does nuclear energy mean and can you give me a example of what it is?
*October 20, 2014*

**Chem Urgent Help Please!!!!**

Chromatography is a powerful analytical technique for separating complex mixtures into their components. Do you think it would be practical to use it on a large scale for preparative purposes? Consider the problems this would involve. You have a product for which counterfeit ...
*October 5, 2014*

**Physics Help Please!!!!**

a pitcher throws a softball horizontally from a height of 1.25 m and notes that it strikes the ground a distance of 15 m from the point where it was thrown. how long did it take the ball to reach the ground? what was the velocity at which the ball was thrown? what was the ...
*September 22, 2014*

**Physics Help Please!!!!**

a pitcher throws a softball horizontally from a height of 1.25 m and notes that it strikes the ground a distance of 15 m from the point where it was thrown. how long did it take the ball to reach the ground? what was the velocity at which the ball was thrown? what was the ...
*September 21, 2014*

**Chem---DrBob222**

Calculate the oxidation # for each atom in the molecule below. Can you help me with the rest. Thank you!!! H H H H / / / / H -- C ---C ===C ----N .. / / H H Group # # of E Oxidation # H 1 0 1 x 7 = 7 C 4 7 C 4 C 4 N 5 3 H atom attached to first C atom. 1 H atom to second C ...
*September 18, 2014*

**Physics Help Please!!!!**

Human reaction times are worsened by alcohol. How much farther would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume both cars are initially traveling at 47.0 mi/h, the sober driver takes .33 s and the drunk driver takes 1.0 s to...
*September 17, 2014*

**Chem---DrBob222**

How many for each Carbon though! That was the part I was confused! Another question? If we have double bond How many electrons we will have between each Carbon atoms? Why did you assign +3 for N??? thank you!!!
*September 17, 2014*

**Chem**

3 H atom attached to first C atom. 1 H atom to second C atom. There is a double bound between second C atom and the third C atom. The third C atom has one H atom. N atom has 2 dots underneath it and attached to 2 H atoms. Note: I tried to display the diagram but it turned out ...
*September 17, 2014*

**Chem**

3 H atom attached to first C atom. 1 H atom to second one There is a double bound between second C atom and third one. The third one has one H atom. N atom has 2 dots underneath it and attached to 2 H atoms. Note: I tried to display the diagram but it turned out to be like ...
*September 17, 2014*

**Chem**

Calculate the oxidation # for each atom in the molecule below. Can you help me with the rest. Thank you!!! H H H H / / / / H -- C ---C ===C ----N .. / / H H Group # # of E Oxidation # H 1 0 1 x 7 = 7 C 4 7 -3 C 4 C 4 N 5
*September 17, 2014*

**Organic-Chem Lab Question Need Help!!!**

a) Would 2-propanol be a suitable solvent to extract caffeine from an aqueous tea solution? Explain? b) You want to use 45 ml total of your extraction solution. Is it better to use three extractions of 15 ml each or one extraction of 45 ml? Explain your answer? Thanks!
*September 13, 2014*

**Chm Help Please!!!**

What is the boiling point of a solution of benzene contain 0.2 moles of a non volatile solute in 125 grams of benzene given that pure benzene has a b.p. of 80.1 Celcius and a Kbp of +2.53 C/m. Thanks!
*September 9, 2014*

**Physics Help!!!!**

Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
*September 6, 2014*

**Physics Help!!!!**

Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
*September 5, 2014*

**Math**

How do you solve 2y-5x=10 using the dual intercept method? I have to solve for X int and y int on a graph. Please help
*August 31, 2014*

**9th Grade Bio**

Thanks Ms. Sue and Damon!! You guys are life savers :)
*August 25, 2014*

**9th Grade Bio**

_______ is the process of digesting food and extracting the energy from it. Directions: Fill in the blank. Please help me answer this question. I've looked through all my textbooks and notes but they didn't mention this anywhere. Can someone please help me? Thanks
*August 25, 2014*

**thermodynamics**

hope to solve it before 29 of may
*May 21, 2014*

**thermodynamics**

design a 1200-W electric hair dryer such that the air temperature and velocity in the dryer will not exceed 50 C and 3 m/s respectively
*May 21, 2014*

**math**

if you tossed 2 nickles 100 times, how many times would you expect to get a)2 heads b)2 tails c)1 head and 1 tail
*May 15, 2014*

**math**

suppose 2 nickles are tossed at the same time what are the possible outcomes? what are the possiblility of getting a)2 heads b)2 tails c)1 head and 1 tail
*May 15, 2014*

**math ratios**

the blue jays baseball team won 17 games and lost 14 games. what is the ratio of wins to losses?
*May 15, 2014*

**science**

If a forest ecosystem is removed through clear cutting, their loss is due to _______ my answer is land development. am I correct?
*May 13, 2014*

**science**

Which of the following statements correctly states how human activity and biodiversity affect one another. A)as humans develop land for homes and industry, biodiversity increases. B)as humans restrict fishing and oil drilling, biodiversity decreases. C)as biodiversity ...
*May 13, 2014*

**calculus help**

A drinking cup is made in the shape of a right circular cylinder. for a fixed volume, we wish to make the total material used, the circular bottom and the cylindrical side, as small as possible. Find the ratio of the height to the diameter that minimizes the amount of material...
*April 25, 2014*

**calculus help**

for f(x)= ln(x-3) on the interval [5,9], find c so that f'(c)= (f(b)-f(a))/(b-a)
*April 25, 2014*

**Calculus Help Please!!!**

Ornithologists have determined that some species of birds tend to avoid flights over large bodies of water during daylight hours. It is believed that more energy is required to fly over water than land because air generally rises over land and falls over water during the day. ...
*April 16, 2014*

**Calculus Help Please!!!**

Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x) = 2x^2 − 5x + 1, [0, 2] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated list...
*April 1, 2014*

**Calculus Help Please!!!**

Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P (see the figure). The point Q is on the floor h = 12 ft directly beneath P and between the carts. Cart A is being pulled away from Q at a speed of 3.5 ft/s. How fast is cart B moving toward Q at...
*March 30, 2014*

**Chemistry Help Please!!!**

1) using kb for NH3 calculate ka for NH4+ ion. Compare this value with that calculated from your measured ph's? 2) how should the pH of a 0.1M solution of NaC2 at H3O2 compare with that of a 0.1 M solution of KC2H3O2? Explain briefly? THANK YOU!
*March 29, 2014*

**Chemistry Help Please**

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!
*March 16, 2014*

**Chem Check Please!!!**

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!
*March 16, 2014*

**Calculus Help**

Find the derivative of the following function showing your work and fully simplifying your answer. f(x)=(8x-3)^5/(6x+7)^12 Thank you!!!
*March 11, 2014*

**Math**

Which is more, 2 liters or 201 centiliters?
*February 27, 2014*

**CHEM**

the number of nonbonding electrons exceeds the number of bonding electrons in the lewis structure of which of the following molecules? I am having a problem with the Lewis structures. HCN NH3 H2O please explain the structure thank you so much
*February 25, 2014*

**CHEM**

In which of the following pairs of compounds are both members of the pair molecular compounds? PCl3 and LiBr CCl4 and KOH NaH and CaF2 Please explain. thank you so much
*February 25, 2014*

**CHEM**

a period 2 nonmetal, X, forms the molecular compound NX3. Which of the following are also correct formulas for molecular compounds involving X? HX OX2 C2X pleas explain why thank you so much
*February 25, 2014*

**Physics**

A particle moves according to the equation x= (10 m/s^2)t^2 where x is in meters and t is in seconds. a. Find the average velocity for the time interval from t1= 2.38 s to t2= 4.3 s. Answer in units of m/s. b. Find the average velocity for the time interval from t1= 2.38 s to ...
*February 9, 2014*

**pol201**

The Annapolis Convention was called to address smaller states would get more representation than larger states. the people would select the House of Representatives as a practical expression of democracy. the House would select the Senate and the legislature as a whole would ...
*October 28, 2013*

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction
*May 5, 2013*

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction
*May 5, 2013*

**Chemistry**

cd2+ (aq) +ni(s)---> cd(s) + ni2+ (aq) what is the half reaction
*May 5, 2013*

**science**

How do i plot i schild plot with this data: Conc (M) 10^-8 Ec50= (microM) 12
*March 3, 2013*

**Chemistry**

Consider the titration of 25.0mL of 0.10M HAc with 0.10M NaOH. That is, NaOH is added to HAc. (a)pH at the beginning of titration. (b)pH at the equivalence point of the titration. (c) pH at the midpoint of the titration.
*February 26, 2013*

**statistics**

how could you reword these research hypoteses to null hypoteses? a) smoking during pregnancy increse the risk of a child being born orematurely. b) regular exercise in older adults decreases blood pressure levels.
*February 12, 2013*

**Science Question**

Which of the following statements best describes what is happening in a water softening unit? The hard ions are all trapped in the softener, which filets out all the ions. The ions in the water softener are softened by chemically bonding with sodium. The sodium is removed from...
*February 7, 2013*

**Physics**

A shopper stands 0.6 m in front of a diverging mirror of focal length 0.2 m. Where is the image located and what is the magnification?
*February 5, 2013*

**geometry**

A rectangular wall is 22.7 feet long and 7.5 feet high. If the door in the wall is 2 feet wide and 6.5 feet high, what is the area of the wall excluding the door?
*December 15, 2012*

**Science**

Thanks
*December 4, 2012*

**Science**

A car traveled at an average speed of 60 mph for two hours. How far did it travel? A. 30 miles B. 60 miles C. 120 miles D. 150 miles
*December 4, 2012*

**Sience**

Thanks
*December 4, 2012*

**Sience**

Hurry!!!!!!!!!!!!!!!!!!!!!!!!!!!! Which of the following is a speed, not a velocity? A. 35 m/s east B. –35 m/s C. 35 m/s D. 35 m/s south
*December 4, 2012*

**Algebra**

Find P(rolling 2 or 5) with one number cube. A. 1 B. 1/6 C. 1/3 D. 1/2
*December 3, 2012*

**Question about APA citations**

I'm typing a paper and I'm SO confused. My question is: Using APA stle, how do I write the PAGE NUMBERS at the end of the sentence. For example my sentence would be: The reason pigs can fly is because they have wings(Jones, 32)....THIS IS THE CORRECT WAY TO USE PAGE ...
*November 28, 2012*

**Physics**

A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ù device is connected to the secondary coil, calculate the current in Amperes passing through the device.
*November 5, 2012*

**algebra 1**

In 1975, when the United Nations was formed, there were 51 member nations. In 1987, there were 159 member nations. Write an equation that gives the number of nations in the UN, y, in terms of the year, t. Let t=0 correspond to 1945 and assume that membership followed a linear ...
*October 24, 2012*

**Math**

Justin wants to use 188 ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden? ~ A. 89 ´ 99 ; 8811 ft B. 92 ´ 96 ; 8832 ft C. 94 ´ 94 ; 8836 ft D. 93 ´ 95 ; ...
*October 17, 2012*

**Pre-Algerbra**

Someone help explain? Justin wants to use 188 ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden? ~ A. 89 ´ 99 ; 8811 ft B. 92 ´ 96 ; 8832 ft C. 94 ´ 94 ; 8836 ft ...
*October 17, 2012*

**Pre-Algerbra**

A basketball drops from a height of 76 in. On bounce 1, it rebounds to a height of 38 in. On bounce 2, it rebounds to a height of 19 in. How high does the basketball bounce on bounce 3? ---- A. 9 inches B. 19 inches C. 9.5 inches D. 4.75 inches
*October 17, 2012*

**physics**

You push a 8.00 kg suitcase across a smooth horizontal floor applying a force directed 31.5 degrees below the horizontal. Someone measures the acceleration of the suitcase to be 1.73 m/s2. Assuming g = 10.0 m/s2, what is the normal force the ground exerts on the suitcase?
*September 25, 2012*

**physics**

You foolishly attempt to jump across a crevasse whose far side is W = 2.93 m away horizontally, and H = 1.35 m lower vertically. What minimum horizontal velocity must you have to make it to the other side? Assuming you have the minimum velocity you just calculated in the ...
*September 25, 2012*

**English Vocabulary**

Is it better to use enmity or enmities in the sentence below? The _________ between teams during the olympics was just for the sake of supporting their teams; there weren't really any hard feelings between the teams or players.
*September 19, 2012*

**MATH**

27.40 for 4 hours of work
*September 18, 2012*

**AP Chemistry, Chem, science**

Can anyone please help me with this problem?? =/ The reaction between solid sodium and iron (III) oxide is one in a series of reactions that inflates an automobile airbag. If 100g of sodium and 100g of iron(III) oxide are used in this reaction, determine: a. the balanced ...
*September 14, 2012*

**American History **

After the Spanish-American War, the _______ reserved the right of the United States to intervene in Cuba's internal affairs.
*August 15, 2012*

**health**

omg this is funny me too!
*August 11, 2012*

**jess**

Sadie the dog is sitting on the roof of his doghouse, 4.5 ft off the ground. He is watching a cat that is 16 ft away from the base of the doghouse. What is the angle of depression from the roof of the doghouse to the cat? Round to the nearest hundredth.
*July 16, 2012*

**science**

an abiotic factor
*May 15, 2012*

**math**

what is 4.505 = in thousanths
*May 12, 2012*

**Math**

t=3
*April 30, 2012*

**Combinatorics**

Entropy 1. Suppose a room has n molecules of a gas. We divide the room into k equal parts. How many ways can the molecules be split evenly between the parts (you may assume that n is divisible by k)? How many ways can the molecules be in only one part? What are the most common...
*April 30, 2012*

**combinatorics **

1. You have k slots (of the same size) to drop n tokens into. How many ways can you do this if the tokens are marked? Unmarked? (Hint: try with 3 tokens and 7 slots first) 2. What is the probability of getting them all in the unique “winning” slot? (Do you use the ...
*April 30, 2012*

**The Great Gatsby**

Why did Daisy and Tom spend a year in France? in the great gatsby They wanted their little girl to learn French. There was no reason. Tom’s family bought a house in Paris. i believe the answer is 3?
*March 12, 2012*

**english**

Jack Kerouac gave the Beat Generation their name because he claimed that his generation of writers was beaten down by (pick one) materialism. politics. religion. traditionalism.
*March 3, 2012*

**math**

i need a list of data with the mode 15 min 5 median 10 max 20
*February 20, 2012*

**geometry**

JUSTIN BIEBER
*February 1, 2012*

**math**

A park has 18 swings. 3/9 of them are tire swings. how many of the swings are tire swings?
*January 30, 2012*

**chemistry**

A 13.0-g sample of ice at -13.0°C is mixed with 105.0 g of water at 78.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the ...
*October 15, 2011*

**biology**

A 28.0-g sample of ice at -18.0°C is mixed with 124.0 g of water at 85.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the ...
*October 15, 2011*

**math**

a rectangular dield isto be enclosed with1120ft of fencing. If the length of the field is 40ft longer than the width, then how long is the field?
*September 30, 2011*

**statistics**

The number of independent errors in a transmitted message of n symbols follows a Binomial distribution. The probability of an error in transmission is .001. If 2,000 symbols were sent, a) Find the expected number of errors. b) Write out the formula for the distribution of ...
*September 4, 2011*

**Physics**

Oh I forgot about displacement. Thank you very much.
*June 30, 2011*

**Physics**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would ...
*June 30, 2011*

**Math**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would ...
*June 30, 2011*

**algebra**

Simplifying Rational Expressions: a^3-2a^2/2a^2-4a
*May 19, 2011*

**Chemistry**

Should turn red
*May 18, 2011*

**physics**

The diagram represents a snapshot of a standing transverse wave on a flexible guitar string taken when the displacement is at a maximum. (Note: the vertical scale is very exaggerated, the actual sideways displacement of the string is negligibly TINY compared to the length of ...
*April 1, 2011*

**STUDY UNIT: MAIN IDEAS**

D!
*December 12, 2010*

**Math**

A math teacher drove by a playground that was full of boys and dogs.The teacher notice there were a total of 40 heads and 100 feet. Hom many boys and how many dogs were there?
*December 9, 2010*

**Math**

Replace A,B,C with numbers so that: A*A=B B-A=C A+A=C
*December 9, 2010*

**physics**

it's true but ur answer is in cal you need to multiply it by 4.18 to convert it to joul
*November 20, 2010*

**physics**

A car engine has 90 kW and an efficiency of 12 percent. Let's assume a simple model of air friction, Fair=Kv2 , with K=027kgm for this car. If there is no other friction, and no winds, what is the maximum speed it can reach?
*October 31, 2010*

**Physics**

A car (mass 980 kg) drives up a hill (height 335 m) in 146 seconds. At the bottom of the hill, it has a speed of 23 m/s, but at the top, it has slowed down to 11 m/s. Neglecting friction, what is the average engine power?
*October 31, 2010*

**Physics**

A bicyclist on an old bike (combined mass: 96 kg) is rolling down (no pedaling or braking) a hill of height 103 m. Over the course of the 278 meters of downhill road, she encounters a constant friction force of 323 Newton. If her speed at the top of the hill is 7 m/s, what is...
*October 31, 2010*

**Pre-Cal**

A box with a square base and an open top is constructed from 5400 cm^2 of cardboard. Find the dimensions of the largest possible box. I know the answer is : base lenght - 42.4 cm height- 21.2 cm please help me, thank you so much :)
*October 9, 2010*

**geology**

We determine the structure of the Earth's core using: a)deep mine shafts b)satellite imaging c)radar and sonar d)seismic wave data e)magnetic resonance imaging
*September 27, 2010*

**space science**

In blackbody radiation, the energy is radiated uniformly in every region of the spectrum, so the radiating body appears black in color. true or false?
*September 12, 2010*

**math**

give the dimensions of rectangles with perimeters of 70ft and length to width ratios of 3to4 4to5 and 1to1
*August 30, 2010*