Questions Asked on
April 4, 2008

AP Chemistry
Ammonia, NH3, is used as a refrigerant. At its boiling point of 33 degress Celcius, the enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is required to vaporize 355 g of ammonia at 33 degrees Celcius? a. 1.12 kJ b. 152 kJ c. 251 kJ d.
asked by Joe 
Math
Eye radius of category 5 cyclones is 20Km. What is the probability that any randomly selected category 5 cyclone will cross the Qld coast such that the eye wall of the cyclone will pass over Cairns which is on a 3200Km section of Qld coast? Cyclones
asked by Gary 
math
sin2xcotx = cotxcos2x Using the various trigonometric identities(i.e. double angle formulas, power reducing formulas, half angle formulas, quotient identities, etc.) verify the identity. I first added cotx to both sides to get sin2x = cotxcos2x+cotx
asked by sam 
AP Chemistry
To prepare 1.000 kg of 5.5 percent by mass KCl (aq), one may dissolve a. 994.5 g KCl in 5.5 g of water b. 5.5 g KCl in 994.5 g of water c. 5.5 g KCl in 1000.0 g of water d. 55 g KCl in 945 g of water e. 55.0 g KCl in 1000.0 g of water
asked by Joe 
physics repost
A 1600 kg vehicle moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s. I don't know this one the only thing I know is p=w/t
asked by Jon 
Physics
A uniform door (0.81 m wide and 2.1 m high) weighs 122 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.5 m apart. Assume that the lower hinge bears all the weight of the door. (a) Find the
asked by Pierce 
Physics
What is the algebraic expression for the ratio ac,second/ac,minute of the centripetal accelerations for the tips of the second hand and the minute hand? Express your answer in terms of the periods Tsecond and Tminute. (Answer using T_m to be the period of
asked by Robinson 
Physics
A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.220 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0.230 kg cup of coffee. Obtain the
asked by Ali 
Physics
By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 2.95 m/s and v2 = 1.70 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the floor.
asked by Kiante 
Physics
The drawing shows a person (weight W = 592 N, L1 = 0.841 m, L2 = 0.410 m) doing pushups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N
asked by Robinson 
physics repost
Carol and Bruno drag a box of mass 58.0 kg along a frictionless floor. Carol pushes the box with a force of 11.4 N at an angle of 40.0 downward from the horizontal. Bruno pulls the box from the other side with a force of 11.0 N at an angle of 40.0 above
asked by Jon 
physics repost
Raul pushes a stalled car with a force of 204 N. If the required force decreases at a constant rate from 204 N to 44.0 N for a distance of 16.3 m in 16.0 s, calculate the average power required to move the car. 20444=160 160*16.3/16 2608/16 answer: 163 W
asked by Jon 
Physics
A person exerts a horizontal force of F = 179 N in the test apparatus shown in the drawing. (h = 0.35 m.) Find the horizontal force M that his flexor muscle exerts on his forearm. The distance between the fexor muscle and the elbow joinf is .051 m
asked by Ali 
Physics
A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 16°C when it was installed. What is its change in length when the temperature drops to a frigid 39°C? m
asked by Will 
physics
A 0.21 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 18 N.  (a) How does the magnitude
asked by Johnathan 
chemistry
Im really sorry I got sidetracked:P This is the question I wanted to ask you In a saturated solution of silver sulfite, the concentration of silver ion is 3.6 x 10^4 mol/L. The Ksp of silver sulfite willl be what? Sorry about that
asked by MikeSo 
physics repost
How much work is a 200 kg weightlifter doing while he holds a 1000 kg barbell stationary .75 m over his head? 1000(.75) = 7350 J
asked by Jon 
physics repost
How much heat must be removed from 0.15 kg of water to cool it from 95 d/C to 25 d/C? The specific heat capasity of water is 4182 J/kgk. mC(T1T2) 0.15(4182)(70) = 4.4 x 10^4 J
asked by Jon 
English
Animals have been used in medical research for centuries. Most of the animals used for research are rodents such as rats, mice, hamsters and gerbils. Some dogs, cats and a variety of goats, ferrets, pigeons, monkeys and rabbits are also used .The struggle
asked by Walker 
Math
What is the probability that the next cyclone to develop in Australian waters will cross the Qld coast (Apply conditional and total probability). Condition is cyclones that cross the Qld coast are only generated in the south pacific. Cyclones generated in
asked by Greg 
Physics
The drawing shows a person (weight W = 592 N, L1 = 0.841 m, L2 = 0.410 m) doing pushups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N I post
asked by Robinson 
Physics
The latent heat of vaporizaiton of H2O at body temperature (37.0°C) is 2.42 106 J/kg. To cool the body of a 89 kg jogger (average specific heat capacity = 3500 J/(kg·C°)) by 1.4 C°, how many kilograms of water in the form of sweat have to be
asked by Pierce 
Physics
A 3.8 kg ball is swung in a horizontal circle at the end of a 1.5 meter rope. If the tension in the rope is kept constant at 79 N, what is the period of rotation, T?
asked by Chaz 
chemistry
Trial 1 Volume of HCL is 2.51 mL Molarity of the HCL is 0.10 M Mols HCL = L x M = 0.0251 L x 0.10 M = 0.00251 mol/L The equation for the titration is Ca()H)2 + 2HCL > CaCl2 + 2H2O I will now take 0.5 mols HCl to give mols of OH 0.00251 mol/L x 0.5 =
asked by Tim's Titration Lab 
art history
Using Durer’s engraving "Knight, Death and the Devil" discuss what aspects of Durer's style show his interest in the concerns of Italian Renaissance artists and what aspects show that his roots are in the painting and printmaking traditions of northern
asked by Dana 
Social Studies
Do you have any thing in social studies about histoy for seventh graders?
asked by Brenna 
AP Chemistry
Which action(s) will decrease the equilibrium concentration of a nonreacting gas in water? 1. decreasing the temp. of the water 2. decreasing the volume of water 3. decreasing the pressure of the gas above the liquid a. 1 only b. 2 only c. 3 only d. 1 and
asked by Joe 
Physics
In an automatic clothes drier, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.39 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an
asked by Zay 
Intermediate Algebra
I have a take home test and I'm stuck on a couple. Anyone help please? 1. Find the vertex & axis of symmetry: 5(x+4)^24 2. Find the vertex & axis of symmetry: y=x^210x+3 3. Simplify: (2i+5)(3+4i) 4. Simplify: 3(21+2i)+(45i) 5. Simplify: (27x^2y^3)^3/4
asked by Krystle 
chemistry
Which of the following is NOT true for solutes and solvents? A. At least one solvent must be dissolved in a solute to make a solution. B. Solute concentration can be measured in terms of solute moles / solution volume or solute moles / solvent mass. C. A
asked by Dino 
Physics
An aluminum baseball bat has a length of 0.87 m at a temperature of 20°C. When the temperature of the bat is raised, the bat lengthens by 0.00016 m. Determine the final temperature of the bat. °C
asked by Will 
Art History
Using the careers of Jan van Eyck, Diego Velazquez, and Jan Vermeer discuss the changes in an artist’s training and in art production / the art market from the 15th to the 17th centuries.
asked by Dana 
Physics
The discreteness of the energy levels of electrons about the atomic nucleus is best understood by considering the electron to be a .....?
asked by Beth 
physics repost
A student lifts a 1.2 kg bag from her desk, which is 0.59 m high, to a locker that is 2.9 m high. What is the gravitational potential energy of the bag relative to the desk? PE=mgh 1.2(9.80)(2.9) = 34.1
asked by Jon 
Repost for Dora
solution is made by mixing 20.0 mL of toluene C6H5CH3d=0.867gmL with 150.0 mL of benzene C6H6d=0.874gmL. Assuming that the volumes add upon mixing, what are the molarity (M) and molality (m) of the toluene For Further Reading * chemistry  DrBob222,
asked by DrBob222 
chemistry
Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide *50.0 mL buret *125 mL Erlynmyer Flask *50.0 mL of distilled
asked by Tim's Titration Lab 
Physics
The equipotential lines inside a parallel plate capacitor a) circles clockwise b)circles counterclockwise c)radiates inwards d)radiates outwards e)runs parallel to capacitor plates f)runs perpendicular to capacitor plates I have narrowed it down to either
asked by Andrea 
accounting
Please help Identify at least three external users of accounting information and indicate two questions they might seek to answer through thier accounting information
asked by Sherri 
chemistry
(A) A student performed the freezing point depression experiment according to directions but mistakenly recorded the mass of lauric acid as 8.300 g instead of 8.003 g. The calculated molar mass of the unknown acid will be ___________ than the true value,
asked by Lindsey 
sci
Although most salamanders have four legs, the aquatic salamander resembles an eel. It lacks hind limbs and has very tiny forelimbs. Explain how limbless salamanders evolved according to Darwin's theory of natural selection.
asked by Kim 
SCI 241
i need to know the path food follows through the digestive system and how digetion occurs in eachof the following parts of the digestive system.. I need to onclude descriptions of other organs or componentsnof the digestive system including: large
asked by Dawn 
Physics
Which laser beam carries more energy per photon? red, yellow, green, violet? I think red. Am I right?
asked by Rob 
Physics
An electron and a proton are traveling at the same speed. Which one has the longer wavelength?
asked by Rob 
macroeconomics
Show that the expenditure approach and the income approach add up to the same figure: consumption $5000 investment $1000 depreciation $600 Profits $900 Exports $500 Compensation of Employees $5,300 Government purchases $1000 Direct Taxes $800 Saving $1100
asked by Tonya 
AP Chemistry
Which of the following properties can be attributed to hydrogen bonding? 1. high melting point 2. high heat of vaporization 3. low vapor pressure 4. high surface tension a. 1 and 3 b. 2 and 3 c. 2, 3, and 4 d. 1, 3, and 4 e. 1, 2, 3, and 4
asked by Joe 
Math
Complete each statement. (Round to the nearest hundredth.) 7 L _________ qt
asked by Ms. Teri 
Math
Samantha’s speedometer reads in kilometers per hour. If the legal speed limit is 55 mi/h, how fast can she drive?
asked by Ms. Teri 
chemistry
NaHS03 heated and want products I have 2NAHS03Heat___2S02+Na +2h20 aLSO Fe in CuS04 Fe(N03)3 + 3NH4OH Fe(OH)3 +3NH4N03
asked by Carol 
chemistry
I need help with this equation as soon a possible How many liters of NH are needed to react completely with 30.0 L of NO (at STP)?
asked by Cari 
Algebra 2
Are these correct...Please help 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? C=6,000/(2002X) C=6,000/(2002*.75)) C=6,000/(2001.5) C=6,000/198.5 C=30.23 Million
asked by Help Please 
Chemistry
The equivalent weights of X and Y are _________ g/equiv. H+ and g/equiv. −OH , respectively, for the following reaction: Z X: benzoic acid Y: calcium hydroxide z: 2C6H5COOH + Ca(OH)2 → 2H2O + Ca(C6H5COO)2
asked by Mia 
Math
Is there any one who knows if I am right? Do not solve, show possibilities of Descartes's rule of signs for roots. 4x^39x^2+6x+4=0 f(x)=4x^39x^2+6x=4  + + one change =4(x)^39(x)^2+6(x)+4  +  + three changes Positive Negative Imaginary 2 1 0 1 2 0
asked by Larry 
Algebra
Write all real and imaginary zeros. f(x)=x^38x^2+x8 81,2,4,8 1 +1,+2,+4,+8 1 8 1 8 1 1 7 6 1 76 14 2 1 8 1 8 2 12 22 1 6 11 14 4 1 8 1 8 4 16 60 1 4 15 52 8 1 8 1 8 8 0 8 1 0 1 0 answer: 8 is zero of f(x)
asked by Lori 
Algebra
solve x+21/x+3
asked by Cynthia 
physics
radius = Infinitely large velocity 30 m/s Hoe would you compute the centripetal acceleration of with the radius being infintely large?
asked by Johnathan 
physics
A 0.21 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 18 N. (c) Is the tension in the string greater when the ball is at the twelve o'clock position or when it is at
asked by Johnathan 
Physics
A uniform door (0.81 m wide and 2.1 m high) weighs 122 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.5 m apart. Assume that the lower hinge bears all the weight of the door. (a) Find the
asked by Kiante 
PreAlgebra
I don't really know how to find what the lenght of the hypotenuse is.  If the length of leg #1 is 5, and the length of leg#2 is 12. What is the hypotenuse?
asked by Joy 
chemistry
If 6.4 grams of KOH crystals are palced within 1.5 L of water(distilled), and after 2 days several crystals are still visible, what is the condition of the system?Is it saturated,closed,unsaturated,open or supersaturated? Thank you
asked by Jenny Q 
art history
The theatrical Baroque mode was often adopted for works of art commissioned by proponents of the CounterReformation in Italy. Using Bernini’s design of the Cornaro Chapel with the altarpiece "Ecstasy of Saint Teresa" and Gaulli’s "Triumph of the Name
asked by Dana 
Calculus: drwls, please
First, I appreciate your help, and this is very kind of all of you to help us. Now, this problem we are both sick of: we are to use transformations of f(x)= 1/x or f(x)=1/x^2 to graph the rational function: f(x)= 1/x 4. I tried using the information you
asked by Pam 
Physics
In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
asked by Rob 
Physics
In the photoelectric effect, what determines the number of ejected electrons?
asked by Rob 
4th grade science
Why is it important to teach 4th graders about whales? How will knowing about whales be beneficial to them? If you have know of a particular website or book that will provide an answer to the above question, please let me know. Thanks alot
asked by Mary 
Business Research and Writing
Discuss the purpose of journals and professional papers. Discuss the organization of a technical scientific paper.
asked by shawn 
Electrons circuits
Hi everyone! I'm new in here. Recently I bought a movement monitor which detects micro movement. If the sensor does not detect a movement in 20 seconds, the buildin speaker will beep until the sensor detects a movement. I'm using it for my project and I
asked by Jacky 
Math
Avirus scanning program is checking every file for viruses. It has completed checking 40% of the files in 300 seconds. How long should it take to check all the files?
asked by Ms. Teri 
Howard Gardener's 4 uses of language theory Psych
Does Howard Gardener's four uses for language have a profound influence on education? I think Gardener's second and third uses for language have an influence on education.
asked by Jared 
physics repost
True/False A hot object has more thermal energy than a similar cold object only because of greater kinetic energy. answer:true
asked by Jon 
physics repost
True/False The thermal energy of the particles in a gas is related to the temperatureof the gas. answer:true
asked by Jon 
physics repost
Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
asked by Jon 
science
A university student wants to perform an experiment using mice as test subjects. The procedure would require the mice to be injected with a specific bacterial infection and then treated with an antibiotic. Their response to the treatment would be observed
asked by Dj 
spell
Steroids in the world of athletes. In the last decade many records have been broken in the world of athletics, is this do to harder training and work ethic or the ignorant testing of anabolic steroids. With technological advances the enhancement of
asked by Walker 
science
A university student wants to perform an experiment using mice as test subjects. The procedure would require the mice to be injected with a specific bacterial infection and then treated with an antibiotic. Their response to the treatment would be observed
asked by Beauty 
Physics
An automobile tire has a radius of 0.380 m, and its center moves forward with a linear speed of v = 19.0 m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) rad/s
asked by Zay 
chemistry
[(exp value  accepted value)/accepted value]*100 = percent error. For exp value, do I have to average my five trials?
asked by Tim's Titration Lab 
math
f(x)= x^2/√x^2 + 1 I have no clue.
asked by Anonymous 
math
The question is; identify the center and the radius of the circle in this equation. 3x^2  √ 3x + 3y^2  y + 1/12 = 0 I ended up getting C:(√ 3/6, 1/6) and R: √ 3/6
asked by Matt 
CalculusHelp! I don't know how to do these..
ie: As x (arrow) 3, f(x) (arrow) ?. This is the actual question. The others are just like it. Once answered, we are to graph it. I have no idea how to do this. Thanks.
asked by Pam 
Calculus Help please
I don't know how to do this, so I can't graph it. f(x)= 1/x4 Thank you for the help.
asked by Pam 
Physics
To say that light is quantized means that light is made up of what?
asked by Beth 
Physucs
What model of light does the photoelectric effect support?
asked by Beth 
Physics
Who was the scientist who first developed the notion of quantization was...? Was it DeBrogile?
asked by Beth 
Physics
In the formula, E = hf, what is h? Is it wavelength?
asked by Beth 
medical info mangement
please check my answer thank which of the following is a government owned,federal facility ? 1. Veteran's Administration Hospital 2. Jones County Hospital 3. Sate medical center 4. City health clinic I picked #1
asked by alex 
medical info mangement
please help me is a website that may help thanks Harper Clinic's filling system generates a gap in the filing space when medical records are moved forward to the most recent assiged medical record number. Which type of the numbering filing system does
asked by alex 
medical info mangement
please check my answer thanks True or False If John Dale is responsible for accounting services for Weston Hospital he's the hospital's chief fisnical officer. I picked True
asked by alex 
medical info mangement
Morris Wesley Hospital is a multifacility, forprofit hospital. What type of owneship is this ? 1.Church affiliated 2. Federal 3. State 4. Nongovernmet proprietary I picked 4 please check my answer thanks
asked by alex 
Physics
Who was the scientist that invented the uncertainty principle ? Was it Heisenberg?
asked by Rob 
Science
why has poor water quality become a problem and how human activities have contributed to the problem.
asked by Mimi 
Science
Can someone tell me what they want when they say "type of visible light"? The plants were in a window and received the morning sun. Question: What type of visible light is made available to for plants grown under the clear, red, or blue plastic?
asked by Tim 
chemistry
How would I calculate this average, given the minus signs in the calculation? Average = 0.00% + 8.06% + 5.82% + 0.00% + 3.42% / 5 = ?
asked by Tim's Titration Lab 
science
What causes salt in the ocean?
asked by Chase 
Java
I am trying to write an algorithm for my JAVA class and am having some issues....if I were to post my program is there anyone on here that could help me figure out what I am doing wrong? Thanks
asked by Mike 
music
i need to find out what makes a good composer,i'm in year 11
asked by hayden 
Psychology
Create mnenomics for the terms: stores, encoding, processes, retrival, iconic memory, echoic memory, primacy effect, recency effect, semantic memory, and episodic memory.
asked by Christian 
Math
The minimum daily values (MDVs) for certain foods are given. They are based on a 2,000 calorie per day diet. Find decimal and fractional notation for the percent notation in each sentence. 1 ounce of Tostitos provides 9% of the MDV of fat. 1/2 cup of
asked by Ms. Teri 
Math
Write each fraction as a percent. 1 and 1/5 I do not know if this is right but my answer would be 1.15 is this right and if not what might it be?
asked by Ms. Teri 
Math
Ms. Jordan has been given a loan of $2,500 for 1 year. If the interest charged is $275, what is the interest rate on the loan? 9.09 is this right?
asked by Ms. Teri 
Math
A computer loaded 80% of a new program in 80 seconds. How long should it take to load the entire program?
asked by Ms. Teri 
Math
Mark uses 1 pt 9 fl oz and then 2 pt 10 fl oz from a container of film developer that holds 3 qt. How much of the developer remains?
asked by Ms. Teri 
Math
Find the square root. 196
asked by Ms. Teri 
macroeconomics
What would happen to money demand, the money supply and the price level if there were a positive shock to production?
asked by jiji 
business law
Which source of law takes priority when a federal statute conflicts with the U.S. Constitution.when
asked by Jessica 
physics repost
A 75 kg skydiver dives out of her airplane 3000 m in the air. How much potential energy will she have left 1/4 of the way down? PE=mgh 75(3000)(.25) = 5.5 x 10^5
asked by Jon 
physics repost
A cable pulls a crate of mass 19.0 kg across the floor in 6.8 s. If the total distance traveled is 5.40 m, find the power used by the cable. w=md 186.2(5.40) w= 1005.48 p=w/t p=1005.48/5.40 answer: 147.9 W
asked by Jon 
Math
2xy=6 yx=0 does x=6 and y=6
asked by Mike 
Math
Transitive Relations Tell whether the following is transitive. R is: {(5,3),(4,5),(4,4),(4,2),(4,3),(2,3),(1,5), (1,2), (1,3), (1,1)}
asked by Lyd 
chemistry
When a good indicator has been chosen, the pH at which the solution changes color is very close to the__________ point of the titration
asked by Mia 
MathAngles+Shapes
I really don't get how like obtuse triangles are the way they are...like who they get measured but mainly I need help on the subject. Please help me understand it!
asked by Cara 
Algebra
I posted this problem last night and some one told me I was wrong. Today, two of my group members have the same answers for this problem. Can some one tell us what or where we went wrong? Using rational zero theorem find all rational zeros
asked by Sara 
Math
what is the inverse of f(a): f(a) = 3a)+ 1/4
asked by Lyd 
reading
Describe Ralph's physical features and also his reaction to being on the island
asked by juan 
Physics
A circuit with a capacitor took .138s to discharge from its max charge Qmax to half of that max charge once the battery was removed. In this series circuit there also is one resistor with 100 G(ohm symbol). The voltage drop is 12V across the battery. a)How
asked by Andrea 
health
I am working on a project that has to deal with Break even points, fixed cost and varible cost, I am not understanding how to do this. any help would be nice. Here is the balance sheet that I am working of of. I have to find the fixed cost, break even
asked by Lauren 
dog behavior
please check my answer True or False The following statement describes classical conditioning. It involves the pairing of a conditioned stimulus with an unconditoned stimulus I say True
asked by alexis 
Physics
1)Several resistors are connected in series. If a battery provides constant voltage in this circuit the addition of another resistor in series a)increases current through each resistor b)decreases current through each resistor c)doesn't affect the current
asked by Andrea 
Physics
When discharging a capacitor it will a) loose half of its charge in equal time intervals b) loose a third of its charge in equal time intervals c) loose a quarter of its charge in equal time intervals d) gain half of its charge in equal time intervals I
asked by Andrea 
accounting
How do I figure out the portion of the company’s total assets that are being financed with debt?
asked by confused 
Maths
The tangent to the curve 2y= 2x^2 5x +4 at the point where x=1 is parallel to the normal to the curve y= ax^2 + bx +10 at the point (2,2). Calculate the values of a and b. The answers are a=1, b=6
asked by Claire 
math
For the vectors u=(2,3) and w=(1,2), calculate 3u  2w.
asked by Devon 
Algebra
4 sqrt5 + 3 sqrt3
asked by Roland 
prealgebra
what is the gcf of 54,144
asked by maria 
Math
How would you simplify this problem? (r*to the power of 3*x st*to the power of 5*)*to the power of 6* x (s*to the power of 8* x t)*to the power of 8*
asked by Saryn 
HistoryWWI
Can anyone help me find a diagram of "no man's land" in World War 1? I have one that shows trenches but need to make diagram of no man's land. Thanks
asked by Sue 
social studies
when did our country become two coutries?
asked by davina