Questions Asked on
June 19, 2011

physics
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 135 m/s. How far short of the target should it drop the package?
asked by kate 
physics
1. The best leaper in the animal kingdom is the puma, which can jump to a height of 12 ft when leaving the ground at an angle of 45°. With what speed, in SI units, must the animal leave the ground to reach that height?
asked by dd 
physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the
asked by kate 
physics
A 57.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 23.0 m. (a) What is the centripetal acceleration of the child? (b) What force (magnitude and direction) does the seat exert on the child at the lowest
asked by Sarah 
physics
A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the
asked by Anonymous 
chemistry
calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction: P4(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)
asked by ceasar 
Chemistry
Use oxidation numbers to identify if this reaction is REDOX reactions. 3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g) 3NO2 = 3 for N = 2 for o2 H2O = +1 for H2 = 2 for O > 2HNO3 = +1 for 2H = 3 for N = 2 for O3 NO = 3 for N = 2 for O
asked by Amy 
Data Management (Math)
A Canadian postal code uses six characters. The first, third, and fifth are letters, while the second, fourth, and sixth are digits. A U.S.A zip code contains five characters, all digits. How many codes are possible for each country?
asked by Student 
PHYSICS
Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor. (a) What is Zach's apparent weight before the elevator starts braking? (b) What is Zach's apparent weight while the elevator
asked by kate 
World History
How did geographic features affect the settlement of Africa?
asked by Anonymous 
Math
A rectangular lot is to be fenced using 80m of fencing. What is the maximum area and what are the dimensions of the lot?
asked by Josh 
Economic
After two quarters of increasing levels of production, the CEO of Canadian Fabrication & Design was upset to learn that, during this time of expansion, productivity of the newly hired sheet metal workers declined with each new worker hired. Believing that
asked by Juanita 
Physics
A ball is thrown straight up into the air with a velocity of +20.5 m/s. Find the velocity of the ball after 2.5 s.
asked by Leasha 
math
A ladder , 5 meter long , standing on a horizontal floor , leans against a vertical wall . If the top of the ladder slides downwards at the rate of 10 cm/sec . Find the rate at which the angle between the floor and the ladder is decreasing when the lower
asked by lucky 
Physical Science
A 2.9kg pile of aluminum ( = 2.70 g/cm3) cans is melted, and then cooled into a solid cube. What is the volume of the cube? a. 931 cm3 b. 1074 cm3 c. 1365 cm3 d. 889 cm3 Thank you!
asked by Wanda 
Chemistry
Use oxidation numbers to identify if this reaction is REDOX reactions. SO2(g) + H2O(l) > H2SO3(aq) for oxidation #s I got: SO2 = 2 for the S = 2 for the o2 H20 = +1 for H2 = 2 for O > H2SO = +1 for H2 = 2 for S = 2 for O3 There for one oxygen was
asked by Amy 
Algebra
4x+2y3z=7 2x+4y+z=35 6x+2y2z=20 solve the system
asked by Jack 
Chemistry
Use oxidation numbers to identify reaction is REDOX reactions. a. 2SO2(g) + O2(g) > 2SO2(g) for 2SO2 I got: 2 for S, 2 for O for O2 I got 0 for 2SO2 I got 2 for S again, and 2 again for 0 Therefore I lost one oxygen and a REDOX reaction occured Am I
asked by Amy 
physics
What is the momentum of an automobile (weight = 9800 N) when it is moving at 36 m/s to the south? magnitude
asked by Gino 
Physics
In one cycle a heat engine absorbs 450 J from a hightemperature reservoir and expels 290 J to a lowtemperature reservoir. If the efficiency of this engine is 57% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high
asked by Melissa 
Chemistry
What is the pH of a solution with a concentration of 4.7 × 104 molar H3O+?
asked by Jamie 
Calculus
the side of an equilateral triangle decreases at a rate of 3cm/s. at what rate is the area decreasing when the area is 150cm squared?
asked by Simba 
Chemistry
Which of the following is the strongest oxidizing agent in acidic solution? DATA: Ba2+(aq) + 2 e¯ > Ba(s); Eo =  2.91 V Mn2+(aq) + 2 e¯ > Mn(s); Eo =  1.18 V 2 H+(aq) + 2 e¯ > H2(g); Eo = 0.00 V Au3+(aq) + 3 e¯ > Au(s); Eo = + 1.50 V
asked by Adam 
statistics
In a study of cold symptoms, every one of the study subjects with a cold was found to be improved two weeks after taking ginger pills. The study concluded that ginger pills cure colds. Does this conclusion seem reasonable? What other conclusion could be
asked by Anonymous 
Physics
I'm trying to prep for an exam, but I am struggling with the practice questions. I have answers for both questions, but I'm 95% sure they are incorrect. 1. Two students decide to run a race. The first student starts off at a constant speed of 5 m/s while
asked by Chelsea 
Impossible chemistry
2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?
asked by Noodle 
Algebra
Elena bicycles 4 km/h faster than Robert. In the same time it takes Robert to bicycle 27km/h, Elena can bicycle 39 km. How fast does each bicycle travel?
asked by Amber 
statistics
The revenue Commissioners Ireland conducted a contest for promotion. The ages of the unsuccessful applicants are given below. Some of the applicants who were unsuccessful in getting a promotion charged that the competition involved discrimination based on
asked by Leslie 
trig
the angle in one regular polygon is to that in another as 3:2 and the number of the sides in first is twice that in second determine the the number of sides of 2 polygons
asked by seema 
Chemistry! I need help quick! Thank you very much!
2h2O2 + 2H2O > 2H2O + O2 If 50cmcube , 2.0 mole/dmcube of hydrogen peroxide is decomposed and volume of oxygen gas collected. How much hydrogen peroxide is decomposed?
asked by Click6 
Chemistry :)
Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent. Show all of the work used to solve the problem. NO2 + Al AlO2 + NH3 Thanks :)
asked by Julia 
American Govt
How are the The Declaration of Independence and Social Contract Theory similar?
asked by Anonymous 
Chemistry
What is the theoretical molarity value of HCL
asked by Alisha 
Chemistry
Consider the voltaic cell: Zn(s) / Zn2+(aq) // H+(aq) / H2(g) / Pt(s) Calculate the value of Ecell, in V, when [Zn2+] =1.00 M and [H+] = 0.00100 M DATA: Zn2+(aq) +2 e¯ > Zn(s);Eo =  0.76 V 2 H+(aq) + 2 e¯ > H2(g);Eo = 0.00 V
asked by Martin 
applications involving quadratic
Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.
asked by Elisa 
rainwater
What would cause rain water puddle to turn black in color
asked by todd 
Chemistry
A freshman is currently enjoying the Arts Studio program she is pursuing at a wellknown university. In her free time, she likes to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a leisurely
asked by mema 
chemistry
identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS
asked by joyce 
statistics
In a Gallup poll, 1003 adults were called after their telephone numbers were randomly generated by a computer. What type of sampling is this?
asked by Anonymous 
chemistry
1.04 g H2 reacts with 10.2 g N2 producing 2.71 g NH3, what is the theoretical yield in grams?
asked by Theoretical yield 
math
In the given diagram,AB represents a vertical pole and CD represents a 40 m high tower both of which are standing on the same horizontal plane.From the top of the tower,the angles of depression of the top and the foot of the pole are 24 degrees,30 inches
asked by kavita 
statistics
For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The
asked by val 
Physical science
A little hexane is poured into a crucible and burnt what is a balanced chemical equation for this reaction
asked by Nomfundo buthelezi 
chemistry
1) what is the mass of 1 mole of Sulfur? 2) How many moles of Silver will be formed from 15 moles AgNO3? Cu + 2AgNO3 > Cu(NO3)2 + 2Ag
asked by bobby sagetty 
Chemistry
2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?
asked by Noodle 
Life orientation
Ways in which you critically discuss how substance abuse disease impact on the teenager
asked by Tshiamo 
math
sin30°ka man
asked by ashish 
Poetry
You might behave with this by giving somebody a hug. You might address a gentleman as "Pop." Now if you're truly friendly with the folks you treat with this, That's great. If not, I'd recommend you stop. a. infuse b. essence c. sacrilegious d. familiarity
asked by Bobby 
Differential Equations
A car is traveling at 70 mph skids 240 ft after it's breaks are suddenly applied. Assuming that the cars breaking system provides a constant deceleration, find that deceleration. How long did it take the car to stop?
asked by Jenna 
calculus
Find the dimensions of the rectangular garden of greatest area that can be fenced off for $6000, if the cost of fencing is $5 per meter.
asked by Yetty 
Algebra
√(y+4)4=1 Y = or no solution I keep coming back to no solution but am wondering if I am confusing myself Please check Thank you
asked by Sam 
economics
You are a painter, and the price of a gallon of paint increases from $3.00 a gallon from 3.50 a gallon. your usage of paint drops from 35 gallons a month to 20 gallons a month. perform the following: 1. compute the price elasticity of demand for paint and
asked by annie 
Math
what are thr proper subsets of (march,april, may)
asked by Jamese 
statistics
A researcher looks at several classrooms, and counts the number of people with brown eyes in each class. Is this qualitative, quantitativediscrete, or quantitativecontinuous data
asked by Anonymous 
statistics
Employees are evaluated as below average, average, or above average. What level of measurement is this? a. nominal b. ordinal c. interval d. ratio
asked by Anonymous 
Intermidiate Algebra
Andrew factored the expression 12x^328x^23x as 4x (3x^27x+9). But when Melissa applied the distributive law and multiplied out 4x (3x^27x+9), she got 12x^3+28x^236x; thus, Andrew’s solution does not appear to check. Why is that? Please help
asked by Elisa 
algebra
Megan factored the expression 72x^243x+6 as (9x3)(8x2). But when Jacob applied the FOIL principle and multiplied out (9x3)(8x2), he got72x^242x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this
asked by Elisa 
algebra
The length of a rectangle is 2 meters more than its width. If the area is 63 square meters, what are the length and width?
asked by Elisa 
Life Orientation
1015 lines critical discuss 5 ways in which the human or environmental impacts on the community?
asked by David 
calculus
f(x)=−8x 2 −8x+96
asked by Anonymous 
business communication
Which of the following sentence(s) is written in the active voice? (Points: 5) Jennifer wrote the examination. The examination was written by Jennifer. The examination was written quickly by Jennifer. Jennifer has written the examination. im thinking A any
asked by lisa 
Algebra  Quadratics (ZERO PRODUCT PROPERTY)
Can the Property of this: ax2 + bx + c = 0 (a+b)(ab) = 0 a = b , a = b BE FURTHER APPLIED TO THIS.....:? ax2 + bx + 8 = 0  8 8 x (ax + b) = 8 x = 8 , x = (8b)/a Thank you!
asked by Christopher 
Intermedia Algebra
Solve by factoring: 2a^2 − 3a = −5
asked by Elisa 
algebra
Factor the expression 16x^272xy+81y^2 into a product of binomials.
asked by Elisa 
algebra
Factor out the greatest common factor from the expression 36x^330x^2
asked by Elisa 
algebra
A 125ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 25 ft longer than the height that it reaches on the side of the bridge. Find the horizontal and
asked by Elisa 
Reading
Those who possess this are rarely afraid To go out and to deal with society. If you lack it, then dinners with too many forks Can fill you with fear and anxiety. a. cascading b. sophistication c. aristocrat d. incessantly
asked by Jazmine 
chemistry
Elements in group 2A(2) 0f the periodic table from ions with a change of, How would I find this out. 1+ 1 2+ 3+ 0
asked by mema 
Chemistry
A gas occupies a volume of 40 ml at 734.8 mm and 22* C . The gas was collected over water and the water level inside the eudiometer is the same as that outside. What is the volume of dry gas at S.T.P?
asked by Noodle 
calculus
Find the relative max and relative min and the point of inflection, yintercept for y  x^3  9x^2 + 15x. Then sketch its graph.
asked by Yetty 
Cultural Diversity
I am once again looking for credible resources...I need a resource for the political,social, economic, and familial conventions(norms) or statuses of MexicanAmericans, Puerto Ricans, CubanAmericans, and ColombianAmericans. I have tried google and the
asked by sassy 
human services
can anyone help me understand the Natural Law Ethics: Saint Thomas Aquinas and relationship of the soul and body. I just need to understand the relationship of the soul and body. I have read and reread the chapter.
asked by patiance 
Math
When you use the quadratic formula (x= b+/=......) can you use that on equations like X^4+2X8? If not, how would you algebraically find the roots of: X^4+2X8? Thanks!
asked by Christopher 
History.. Revisions made
Is morality is a Social Function (Construction)? This would imply that there is no such thing as REAL morality only the morality that society forces us to follow (both consciously and unconsciously). Use examples to explain your case. [ WARNING: If you do
asked by blar 
Algebra
Hi, I have had to work on several of these types of problems with no success. Could someone help me make the process easier? I have spent many hours with inconsistent results. A company offers their employees two medical insurance plans; Plan A has a $130
asked by Aria 
adult education
i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature
asked by arash akbary 
health
1 human factor that causes ill health,accindents,crises,and disasters within your community
asked by Anonymous 
science
how is the inventer of hydrogen
asked by sweety 
science
when water is turn into steam it expands or contacts many times or both ??? i need help with this question
asked by jay 
calculus
Find the angle ABC, if A = (4, –3, –1), B = (0, 0, 0) and C = (–2, –3, 5) Could you lead me in the right direction I don't know where to start
asked by Johannie 
math2
Which statement is false? a ¡ô {a, b, c} ¨ª ¡ø {a, b, c} ¨ª ¡ö {a, b, c} ¨ª ¡ô {a, b, c}
asked by anonymous 
Business Math
Cassandra is repaying an installment loan of $3,500 with 20 equal monthly payments of $196 each. what is the annual percentage rate of the loan?
asked by Sandy 
math
Elisa need to pick a numerical password that contains 4 digits using the numbers 09 If none of the digits can be repeated, how many 4digit passwords are possible
asked by danny 
accounting
What do you think mcdonalds corporate strategy and goals were?
asked by BreeBree 
physics
a mettallic rod of lenght l is rotated with speeed v in uniform magnetic field. find induced current if r is resistance.
asked by Rich 
sci
Would you say that with the rise in global warming, and with the increased amount of industrial wastes in the atmosphere, water at this point has a good chance to remain bound with aerosol and other impurities?
asked by meshelle 
algebra
Factor the following expression completely: 45x^3y – 80xy
asked by Elisa 
algebra
Factor out the greatest common factor from the expression 9a2b3 – 12a2b4 – 24a3b
asked by Elisa 
algebra
Use the “difference of squares” rule to factor the following expression: 100a^664b^8
asked by Elisa 
health
Please give two approaches of measuring patient outcomes?
asked by Patty 
Reading
Which word from the choices below is described the poem that follows? We start escaping this when we Sing "ABCDEFG." That song is not enough, and yet The first step is the alphabet! a. aristocrat b. illiteracy c. aura d. essence Help if you can
asked by Jacob 
calculus
What is the limit definition of f'(x) and use it to find f'(x) for f (x) 5x^2  2
asked by Yetty 
English
Hello. I will really appreciate some help. 1) Is it possible to use "consider" in the context "The US Congress will consider the bill on Friday"? 2) Is it possible to use "implicitly" in the context "He won the elections implicitly" (meaning "he won an
asked by Ilma 
Prealgebra
0.2297=(1/x^21/49) I don't get how to solve for x. Pls help stuck on a problem
asked by Sonia 
physics waves and photons
Waves and photons ( ) simultaneously be used to describe exactly the same experimental data, even within the same experiment? A) can B) cannot C) sometimes can
asked by Rick 
art
• What was the role of ethnic minorities and their influence on the various arts? Can someone help show me where I can look to find this answer. Thank you
asked by renee 
chemistry
i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature
asked by arash 
chemisry
If you have 32g of NH3 how many moles of NH3 is that?
asked by kelly 
ap history
the question is Whom does he blame for the alleged conditions to which he refers? this is from benjamin tillman's antiblack tirade 1907. the book is the American spirit ny d. kennedy. it says that he boasted in his speech to the senate "we took the
asked by shea 
fdfd
What is the importance of blue cross blue shield plans in the evolution of health care coverage?
asked by Anonymous 
Intermidiate Algebra
The area of a rectangular athletic field is represented by the expression 25y^24z^2 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct
asked by Elisa 
math
3.5x10^4 expanded form
asked by kim 
calculus
find equation of a tangent line to y=x^35x+6 at the point where x=2
asked by Yetty 
Science
calculate the energy released from a cell in a portable fan that was switched on for 50.0 seconds. The voltage drop was 1.5 V and the current was .55 A.
asked by Anonymous 
SCI/275 (Risk Assessment)
There is a direction in this assignment where the projection of WNV in Genericville is 50 cases. It also mentions that in 2006, there were 4,269 cases, of WNV including 177 fatalities. It follows with the proposal that the Malathion would reduce the
asked by Carol 
enviromental science
im struggling to find the answer to this question when will fossil fuels run out? ive looked on different sites but can`t find the answer. thanks for helping.:)
asked by harrie 
social studies
imagine if you are an archeologic working on a archeological site etc how you will use your full equipments a.camera b.magnifying glass c.bull dozer d.measuring tape
asked by prashant 
intermidiate Algebra
The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include
asked by Elisa 
the quadratic formula
15t^2+7t=2
asked by Elisa 
Physics
what happens to the index refraction of air as temperature increases?
asked by sharon 
calculus
if a rocket is launched upward at 80fett per second. what will its height be at (t) seconds later s= 80t14t^2
asked by Donna 
math
State whether the following sequence is arithmetic, geometric, or neither. 10, 10.25, 10.50625, 10.76890625, ....
asked by anonymous 
physics
A train passes a control tower with a velocity u and has a constant acceleration.At 800m beyond the tower,the velocity is 48km/h;and at 1.6km beyond the tower,the velocity is 64km/h,what is the velocity u ?
asked by chrystabelle 
algebra
what is m^3n11m^2n^2+28mn^3 factored completely
asked by mary 
HistoryCivil War
Of the Union Generals covered in the course through 1863, who was considered the worst? The.. site you gave me in the past was of no help at all...was mostly timelines..I came up with George B. McClellan ???????
asked by Joanne 
philosophy
Consider a specific moral question which might make it difficult to accept the relativist's response. State the moral issue involved, and provide an explanation as to why you think a relativist might have problem giving a justified response to it
asked by Carnita 
math
√3:(x)*√4:(6x) as a single radical expression. 216x?
asked by Sam