Questions Asked on
July 28, 2014

math
Find dy/dx and d2y/dx2. x = et, y = te−t
asked by sara 
PHYSICS
You are driving your car and the traffic light ahead turns red. You applied the brake for 3.00 seconds and the velocity of the car decreases to 4.50 m/s. The car's deceleration has a magnitude of 2.70 m/s^2 during this time. What is the car's displacement?
asked by Jino 
math
Mrs. Richmond bought some apples and pears in the ratio 3:5. After she gave away 3/5 of the apples and 40 pears, the ratio of apples to pears became 2:5. An apple costs 30 cents. A pear costs 15 cents more than an apple. How much did Mrs. Richmond pay for
asked by john 
Chemistry
Will the following reactions mixed together cause a precipitate reaction, released gas reaction, or no reaction. Ba(NO3)2 mixed with NaCl Ba(NO3)2 mixed with HCl Ba(NO3)2 mixed with Na2CO3 Ba(NO3)2 mixed withNa3SO4 also Ba(NO3)2 is soluble and a solid and
asked by Summer 
Math
Walter is making an opentop box. The length is 6 inches greater than the width, and the height is 2 inches. The area of the rectangular sheet of material that will be folded to make the box is 280 square inches. What is the length of the box in inches? (I
asked by Brookanne 
Social study
why are certain projects called multi purpose projects
asked by Hoor 
statistics
A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?
asked by liz 
Chemistry
100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution?
asked by Ally 
economics
what is the south africa government providing and to whom
asked by sfundo 
Math
Lynn was shopping and found a purse that was marked with a discount of "1/3" off. If the original cost of the purse was $80, how much will Lynn pay?
asked by Lexie 
math
5. There are x dictionaries in a bookstore. After 1/8 of them were purchased, 10 more dictionaries were shipped in bringing the total number of dictionaries to 52. What is the value of x?
asked by Johnny 
physics
a jeepney of a mass 1500kg is travelling at a speed of 20m/s (about 70km/h) a. what is the kinetic energy of the jeepney? b.suppose the driver suddenly steps on the brakes. if the force is 7500 newtons, what will be the distance traveled by the jeepney
asked by Nialleen 
Physics 2
List and explain briefly five magnetic devices found in the popular culture Are stationary charges affected be a magnetic field? What determines the direction of the magnetic force on a moving charge? What is the cause of all magnetic fields?
asked by seanmarch58 
College English
Red Jacket and Tecumseh in their respective speeches (again, as translated and transcribed), make frequent reference to “brothers” and brotherhood. Why such emphasis, at that historical moment, upon fraternity and unity? CAN SOMEONE CHECK MY ANSWER TO
asked by Kiara 
Chemistry
How many liters of nitrogen oxide at STP are produced from the reaction of 59.g of NH3? Balanced Equation: Ammonia reacts with oxygen to produce nitrogen oxide and water. 4NH3(g)+5O2(g)→4NO(g)+6H2O(g)
asked by JR 
physics
An object carries a charge of 6.9 µC, while another carries a charge of 2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the same charge?
asked by Lily 
Science
. A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for painkilling substances. B. Read anthropological
asked by Dulce 
English
(1) Brenda would have liked to have taken her vacation at the beach. (2) However, the weather forecast on the television called for rain. (3) Also, her fiancé, Max, wanted to vacation in the mountains. (4) After a heated discussion, Brenda and Max decided
asked by Shayna 
Science
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heterozygous plant (Tt) is crossed with a homozygous tall plant? A. 100% B. 75% c. 50% D. 25% B?
asked by Dulce 
Business
in the u.s. economy,_____are considered the reward for risk of entering business.
asked by Robert 
Physics 2
A 42 mT magnetic field points due west. If a proton of kinetic energy 9x10E12 J enters this field in an upward direction, find the magnetic force acting on the proton in magnitude and direction.
asked by seanmarch58 
Astronaut launches bowling ball
A 100 kg astronaut carries a launcher loaded with a 10 kg bowling ball; the launcher and the astronaut’s spacesuit have negligible mass. The astronaut discovers that firing the launcher results in the ball moving away from her at a relative speed of 50
asked by David 
counseling
A low, nonsignificant correlation between an observationbased assessment of symptoms of autism and a teacherreport of ADHD symptoms provides ____________ of the validity of the autism measure
asked by Anonymous 
math
A 5 kg bag of apple costs R65. What is the cost of 500 grams of apples
asked by Katlego 
Physics
Two objects separated by a distance r are each carrying a charge –q. The magnitude of the force exerted on the second object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the
asked by Lily 
physics
Two spherical objects are separated by a distance of 1.53 × 103 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As
asked by Lily 
Physics 2
Explain briefly the workings of electrical transformer, both stepup and stepdown In a stepup transformer, compare the secondary voltage and current to the corresponding primary values. Explain briefly how transformers minimize losses in long distance
asked by seanmarch58 
College Physics 2
A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. (B) What would be the frequency of a station for which the carrier wave was 400 m long?
asked by seanmarch58 
Chemistry
Orange juice clams that 200ml of their product contains 2.5 times the average daily allowance of Vitamin C. Calculate the average daily allowance of vitamin c (in mg) if the orange juice contains 0.040% (w/v) of vitamin C.
asked by A 
general math 1
1. Find the product of 487.9573 and 1,000.
asked by Jordan 
physics
A proton moves parallel to an electric field between points A and B. The change in the proton's electric potential energy is EPEB – EPEA. If the proton is removed from point B and replaced with an electron, how does the change in electric potential
asked by Lily 
Physics 2
A 60 cm long wire is oriented from east to west directly above the equator and carries a current of 5 A (toward the east). What is the magnitude and direction of the magnetic force on this wire due to the earth’s magnetic field (30 µT oriented south and
asked by seanmarch58 
organic chemistry
What is the complete reaction mechanism for the reaction between butanone and methylamine (CH3NH2) with the reaction buffered at a pH of 3.5 and heated.
asked by Jenn 
Math (Discrete Math)
Let R be the statement : for all sets A, B and C, if A⊆B∪C and B ⊆C∪A then AΔB = C. Q: Is R true for all sets A, B and C? Prove answer Let S be the statement: for all sets A, B, and C, if AΔB = AΔC then B⊆C. Q: Is S true? prove answer Thanks
asked by Anonymous 
chemistry
Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?
asked by chi 
Business Law
The furniture salesperson tells Paul Weinberg that the table he is admiring is solid cherry. Weinberg purchases the table, then discovers that it is not cherry but another wood stained to look like cherry. Does Weinberg have any legal resources? I said yes
asked by Melissa 
Medical Billing & Coding
A physician performed an aspiration via thoracentesis on a patient in observation status in the hosptial. The patient has advanced lung cancer with malignant pleural effusion. Later the same day, due to continued accumulation of fluid, the patient was
asked by Dee 
Science summer activity help
I saw a site that had fun summer activites and my mom said each one I pass I get 5 dollars so I want to check my answers. 1.B 3.D 4.A 5.D 1.how do scientists explain the great diversity of life on earth? different characteristics help __ A. young organisms
asked by Matt 
physics
1. If the period of a wave is 0.27s, how many waves would pass by in 1.0 minute? 2. When a wave from of light passes through an opening that's large compared to its wavelength, it: a) behaves as a single new point source b) produces a straight wave front,
asked by Liz 
Physics
The maximum torque output from the engine of a new experimental car of mass m is τ. The maximum rotational speed of the engine is ω. The engine is designed to provide a constant power output P. The engine is connected to the wheels via a perfect
asked by Kevin Fung 
Physics  check answers please
1. If 31 waves pass by a point in 1.7 s, what's the frequency? my answer: 18.2 Hz 2. if a crest with an amplitude of 7cm interferes with a trough with an amplitude of 10 cm, the resulting wave has an amplitude of: my answer: 3
asked by Liz 
Management
When a manager performs symbolic duties as the head of an organization, that manager is called a
asked by Robert 
Management
Which one of the following is a defensive strategy?
asked by Robert 
math
2. James spends 10% of his money for movie; he also spends 20% of his money for his lunch. Then he buys $20 in his office supplies. In the next day, he spends $10 for his breakfast. Now he leaves 40% of his original money. How much does he save originally?
asked by Johnny 
Physics 2
State Lenz’s law and explain Briefly explain the operation of an electric generator
asked by seanmarch58 
math
If 12V=3W, and v(not equal)=0, then which of the following is equivalent to 2W8V? A.0 B.4W C.6W D.2V E.2V please show work.
asked by Johnny 
math
Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1.5 hours. How quickly can all three fill the pool together? A.12 minutes B.15 minutes C.21 minutes D.23 minutes E.28 minutes I
asked by Johnny 
Calculus
Find the antiderivative, F(x), with F′(x) = f(x) and F(0) = 1. f(x) = −7 x
asked by Anonymous 
Maths (differentiation)
Differentiate Y = 1/SinX^2
asked by Francis 
Technology
Behind the United States, the world's second largest emitter of energyrelated emissions is: A. Mexico. B. China. C. The Soviet Union. D. Europe. im confused between B and D
asked by Amy 
Criminal justice
what subject matter does the us supreme court not have the power to decide?
asked by Anonymous 
math
The game involves tossing a penny and a dime along with rolling a die. to win the penny land heads up, the dime land tails up and roll a 6 on the die. what is the probability that he will win on the first play
asked by mj 
economics
what are welfare payments or consumer or subsidies?
asked by sfundp 
Technology
According to the textbook, Iceland's proposed hydrogen economy is driven by all of the following EXCEPT: A. recent developments in hydrogen fuel cells. B. the movement to combat global climate change. C. concerns over the price and supply of oil. D. ethnic
asked by Amy 
Chemistry
Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
asked by Alex 
Physics 2
In order of increasing frequency, list the waves that make up the electromagnetic spectrum and give an example of each type of wave. Explain how Snell’s law describes refraction.
asked by seanmarch58 
chemistry
The half live of Iodine131 is 8 days. if you started out with 40 mg sample of iodine131, then what would be the mass of the sample after 32 days? please show your work
asked by Massiel 
math
Carl weighted 180 pounds after two months he lost 9 pounds what percent of his weight did he lose
asked by kim 
Geometry
I don't understand any of this :( "What is the area of a trefoil whose horizontal base has length 2?" Please help!!!
asked by Sheenybeany 
Math
How do I graph a slope of 2/3 passing through the point of (3,4). Please help. I was given this answer, but I am unsure if it is correct **Since the slope is 2/3, go right up 3 and up 2 and plot another point.
asked by Natalie 
English
Red Jacket and Tecumseh in their respective speeches (again, as translated and transcribed), make frequent reference to “brothers” and brotherhood. Why such emphasis, at that historical moment, upon fraternity and unity? CAN SOMEONE CHECK MY ANSWER TO
asked by Kiara 
Math
I wanted to see if I was solving this problem correctly. A line passes through the point (3,8)and has a slope of 2.Write an equation for this line. y=mx+b m=2 y=2x+b 8=2(3)+b
asked by Natalie 
Help
In the tradition of their Native American ancestors, Decorah Custom Canoes specializes in creating handcrafted canoes using the finest natural materials. Whether they are from birch bark or cedar, all canoes are custombuilt from native wood. Each piece is
asked by Peg 
Physics  check answers please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
asked by Liz 
chemistry
what mass of water must react with calcium carbide for 3.9g of acetylene gas to form?
asked by christopher natividad 
CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound
asked by AYESHA 
eng1511
If you wanted to know the gist of the passage would you skim or would you scan through
asked by angel mona 
physics
a car is moving foward at 15.7m/s. a person in the bus throws a ball horizontally toward the front of the car at 17.5 m/s from your perspective as an observer outside the car the tennis ball appears to moving at what velocity?
asked by alysssa 
Science
While picking up passengers in a big city, a taxi driver drives 20.0 blocks south, then 15.0 blocks east, and then 6.0 more blocks south. What is the magnitude of the taxi’s resultant displacement? Iv'e been using the equation sqrt(x^2+y^2+z^2) THe
asked by Kate 
pharmacy
If the total dose is 0.930mg and the drug is given in 3 equal doses, what is the amount of each dose in milligrams?
asked by chi 
health
People who smoke any kind of cigarette are at _________ of developing lung cancer than people who do not smoke.
asked by bailey 
CHEMISTRY (IODINE VALUEcontinuation)
y question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 711 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1.
asked by Summer 
Philosphy
According to Cady Stanton, the least bad form of subjection of women is based in this
asked by jasmine 
math
6. In a residential building, the ratio of man and woman is 5 to 8. In August, there are 30 men and 10 women moving out from the building. After that, the ratio of man and woman in this building is 1 to 2. How many men were there in the building before
asked by Johnny 
Economics
In relation to Economics, explain the difference between nominal data and real data? *if someone can help me understand this better, I would be greatful.
asked by Timothy 
Science
Can you give me a good topic for an investigatory proj. Like "The use of grape extract as an active component for removing ferrous oxide". The example is not from me, so I can't really use it. I need something posible that isn't proven yet.
asked by Accelarator 
general math
2. Solve this equation: 5x − 2 = 2x + 7
asked by Jordan 
College English
Discuss, in “Sinners in the Hands of an Angry God,” Edwards’ description of God’s wrath and Edwards’ use of the metaphors of storm and thunder, flood and fire. CAN YOU TELL ME DID I ANSWER THE QUESTION RIGHT? Jonathan Edwards is a name that is
asked by Kiara 
math/help
a)4 1/6 divided 1 1/6 b)4 2/9 + 3 3/1
asked by Dulce 
Math
How do I graph a slope of 2/3 passing through the point of (3,4). Please help
asked by Natalie 
Physics 2
what magnetic force would an electron experience due to Earth’s magnetic field if it were moving at 3x10E6 m/s directly away from earth’s surface? (Earth’s Bfield in the region is parallel to the surface and has a strength of 550 µT)
asked by seanmarch58 
math
The square of a certain whole number N is N squared. If 60 is a factor of N squared, its possible that __ is not a factor of N squared.
asked by john 
math
How many threedight integers greater than 600 contain only odd digits?
asked by Johnny 
math
Benadryl is on sell this week for 20% off of the normal selling price at $10.00 per unit. If the pharmacy purchased Benadryl at $8.00 per unit, what is the gross profit percentage?
asked by cham 
math
please factor the ff: 1.x^2+16x36 2.x^410x^2+9 3.(4+x)^2(4+x)20 4.23x^1+x^2 (all of the exponent here in number four is negative) thanks.....
asked by nialleen 
SAT Writing
Please give me a score of 16 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep
asked by Anonymous 
Math
Find the slope of 8x+4y=7 in parallel and perpendicular lines. Please help me figure this out? Still need help
asked by Natalie 
Physics  check answer please
Refraction is: a) the way light behaves when it goes through a narrow opening b)the way teo light sources interact to produce interference patterns c) the absorption of one component of the electric field d) none of the above are correct my answer: d
asked by Liz 
physical science
what is observed during an experiment of oxalic acid and sodium hydroxide
asked by Anonymous 
Math
How do I find the slope of the line in simple form? 4x+5y=3
asked by Natalie 
Math
Find the slope of 8x+4y=7 in parallel and perpendicular lines. Please help me figure this out?
asked by Natalie 
physical
what is cell
asked by Anonymous 
math
If n>0, then (4^n)(8^n)= A.2^9n B.2^8n C.2^6n D.2^5n E.2^4n
asked by Johnny 
Math
How do I write an equation for (3,8) that has a slope of 2? So far this is what I came up with. y=mx+b m=2 y=2x+b 8=2x3
asked by Natalie