Questions Asked on
July 31, 2013

chemistry
concentrated aqueous sulphuric acid is 98% sulphuric acid by mass and has a density of 1.80 g/l. Volume of acid required to make one litre of 0.1M sulphuric acid solution is
asked by Pooja 
physics
a boy tosses a coin upward with a velocity of 14.7 m/s. a. find the maximum height reached by the coin. b. time of flight c. velocity when the coin returns to the hand d. suppose the boy failed to catch the coin and the coin goes to the ground, with what
asked by jenalyn calimag 
Math
Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment?
asked by Scott 
chemistry
find the mass of sucrose(molecular mass=342)required to be dissolved per 600cm3 solution to prepare a semi molar solution
asked by anonymous 
physics
A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.800 s. (a) How far away(m) is the explosion if air temperature is 22.0°C, neglecting the time taken for light to reach the physicist?
asked by Justin 
physics
An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
asked by Justin 
physics
A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.800 s. (a) How far (m)away is the explosion if air temperature is 22.0°C, neglecting the time taken for light to reach the physicist?
asked by Justin 
solid mechanics
Find the Euler's crippling load for a hollow cylindrical steel column of 3.8 mm external diameter and 2.5 mm thick. Take length of the column as 2.3 m and hinged at its both ends crippling load by Rankine's formula. Using constants as 335 Km/mm² and
asked by ripon 
physics
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?
asked by Justin 
physics
An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
asked by Justin 
Harvard Justice
According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single
asked by Kate 
math
From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?
asked by joe 
Using windows
Which folder is the default choice for saving bitmap or JPEG files created by a user?
asked by Sofiya 
physics
(a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?
asked by Justin 
physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?
asked by Justin 
trig
the base of a trapezoid are 22 and 12 respectively. the angle at the extremities of one base are 65 degree and 45 degree respectively. find two legs?
asked by kathy 
physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?
asked by Justin 
Physics
The figure below shows two springs connected in parallel. This combination can be thought of as being equivalent to a single spring having an effective force constant keff. Obviously, the effective force constant must be related to the force constants k1
asked by aadsa 
Math (Triangles  (Angle of Elevation)
A television antenna is situated atop a hill. From a point 200 m from the base of the hill, the angle of elevation of the top of the antenna is 80°. The angle of elevation of the antenna from the same point is 75°. How tall is the antenna?
asked by Drake 
physics
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?
asked by Justin 
math
To win the jackpot in a lottery in Iowa, participants have to select 6 unique winning numbers out of the numbers 1 through 49 in which the order does not matter. What is the probability of winning the jackpot? State your answer as both a fraction and
asked by emma 
Chemistry
how many moles of Mg2+ and NO3(there is a negative sign on top of the 3 in NO3)form for each mole of Mg(NO3)2 that dissolves?
asked by mariana 
Physics
The figure below shows two springs connected in parallel. This combination can be thought of as being equivalent to a single spring having an effective force constant keff. Obviously, the effective force constant must be related to the force constants k1
asked by aadsa 
Chemistry
Indicate which of the metallation reactions given below would be thermodynamically favourable on the basis of the pKa data in nonaqueous media provided. What is the underlying principle that determines whether the reaction occurs? (a) C6H5Li + C6H5CH3 →
asked by Anonymous 
math
Yani wants to make a scale diagram of the floor plan of his school. He wants his diagram to fit on an 8.5in. by 11in. sheet of paper. The school is 650ft long and 300 ft wide at its widest point. a) what would be a reasonable scale for Yani to use so that
asked by Anonymous 
Math
A computer chip on a circuit board has a rectangular shape, with a width of 6mm and a length of 9mm. Plans for the circuit board must be drawn using a scale factor of 15. Draw a scale diagram of the computer chip as it would appear on the plans. Please
asked by Anonymous 
physics
(a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?
asked by Justin 
Geometry
Point Y lies on line segment XZ, between X and Z. The (x,y) coordinates for X and Z are (7,2) and (3,3), respectively. If the ratio of line segment XY to line segment YZ is 2 to 3, what are the (x,y) coordinates of Y?
asked by Anonymous 
Physics
An iorn rod (a=11.8 x 10^6C^1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
asked by Jason 
physicsoptics
The index of refraction of Ruby is less than the index of refraction of diamond. Why?
asked by silent_klr 
child psychology in general
most traditional childrens nursery rhymes? a.were written by children b.were written by educators c.make fun of physical distinctions d.encouage tolerance of others my answer is b
asked by susue 
Math (Triangles)
The vertex angle of an isosceles triangle is 40°20'. Each of the leg measures 320 mm. Find the length of the base.
asked by Drake 
Chem
A student was performing an extraction procedure of oXylene from water into octanol. The total mass of oXylene was 0.10 gram (molecular weight 106.2 g/mole). The volume of water was 990mL and volume of octanol 10 mL. There is a head space of 200 mL above
asked by Sahara 
math
As you follow your favorite NBA basketball team’s statistics, you notice the point guard is successfully shooting 85% from the freethrow line for this season. Assuming he is fouled near the end of a game and shoots with that same success rate, what is
asked by emma 
Chemistry Please Help!!
Acetic acid has a Ka = 1.75 x 105 and formic acid has a Ka = 1.8 x 104. Which is the stronger acid?
asked by Kelly 
Chemistry
What is the pH of a solution that results from adding 0.075 mol Ca(OH)2 (s) to 1.71 L of a buffer comprised of 0.37 M CH3COOH and 0.37 M CH3COONa? Any help is appreciated!
asked by Anonymous 
Math
The chief financial officer of a home health agency needs to determine the present value of a $10,000 investment received at the end of year 10. What is the present value if the discount rate is: a. 6 percent? b. 9 percent? c. 12 percent? d. 15 percent?
asked by April 
Math
Write the ratio 2.7kg to 1.8kg as a fraction to the simplest form, with whole numbers in the numerator and denominator.
asked by Brenda 
tax
Business Investigation Expenditures. During January and February of the current year, Big Bang LLC incurs $3,000 in travel, feasibility studies, and legal expenses to investigate the feasibility of opening a new entertainment gallery in one of the new
asked by jose 
math!
Imagine that you are doing research for a term paper in your English class and you have chosen the topic of “expected winnings of a lottery.” You find the following information for your state’s lottery: Prize Probability Jackpot 1 in 60,000,000
asked by emma 
chem
Suppose that a fully charged leadacidbattery contains 1.50 of 5.00 . What will be the concentration of in the battery after 3.90 of current is drawn from the battery for9.00 ? \
asked by paco 
Chemistry/Env Sci
a)the E0 for the reactions 2HOCl + 2H+ + 2e → Cl2 + 2H20 and Cl2 + 2e → Cl are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl and develop the full pE/pH equation for this reaction. b)What is the pE of a
asked by Dave 
Math
After completing her residency, an obstetrician plans to invest $12,000 per year at the end of each year in a lowrisk retirement account. She expects to earn an average of 6% for 35 years. What will her retirement account be worth at the end of these 35
asked by Tammy smith 
statistics
Suppose a largescale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The pvalue turned out to be .004, and a 99% confidence interval for the
asked by Alexander 
Math
I need help my homework and when I post I don't get an response what do I have to do for someone look at my homework question. Lincoln Memorial hospital has just been informed that private donor is willing to contribute $5 million per year at the beginning
asked by April 
math
how many ways can a 3 person subcommittee be selected from a committee of 7 people
asked by Scott 
math
from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?
asked by joe 
math
Phil has 20 coins, nickels,dimes, and quarters, totaling $2.30. If he has twice as many nickels as quarters, how many quarters does Phil have?
asked by vincent 
Writing
Please grade my ACT writing test on a scale of 1Please make corrections and give me feedback. By the way, I wrote this essay in 30 minutes. ACT Test Prompt: Schools in some states have changed their school calendars so that they are now yearround
asked by Anonymous 
college algebra
If 4 melons for $0.60, how much would 6 melons cost?
asked by b1313s 
Biomechanics
What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?
asked by Natalie 
English
Need help please. For the following exercise, choose a topic, and then determine which method of organization is best suited for its development. Next, write a topic sentence that applies to your treatment of the subject. Finally, list at least four
asked by Carlos 
Math
If business manager deposits $30,000 in a savings account at the end of each year for twenty years what will be the value of her investment: at a compound rate of 12 percent? at a compounded rate of 18 percent? What would the outcome be in both cases if
asked by April 
ics
basically speaking,a contingancy plan is
asked by wesam 
Chem
Ka1 = 4.5E7 and Ka2 = 4.7E11 for the carbonate system. Ksp is 5.0E9 and Kw =1.0E14. A town’s groundwater has [Ca2+] = 37 mg/L, alkalinity of 1.36E3eq/L and pH of 8. This is to be mixed with surface water with [Ca2+] = 4mg/L, alkalinity of 8.0E4
asked by Michele 
MATH 11
Yani wants to make a scale diagram of the floor plan of his school. He wants his diagram to fit on an 8.5in. by 11in. sheet of paper. The school is 650ft long and 300 ft wide at its widest point. a) what would be a reasonable scale for Yani to use so that
asked by Please Help!!! 
math
The supplement of an angle measures 11 times its complement. Then the measure of the angle is: (A) 9 degree (B) 99 degree (C) 81 degree (D) 90 degree (E) none of these not just answer, please tell me how to do it
asked by vincent 
differential calculus
a bed is in a form of a circular sector. find its radius if the area of the sector is 1000 centimeter square and its perimeter is a minimum
asked by len 
Creative Writing
[Much like the wind that swirled around with a few fallen leaves, his mind whirled and buzzed with thoughts that would continue to move around, but never leave.] I can't think of a good way to describe thoughts like the 'wind.' Can anyone help, or does
asked by Millie 
math
a box filled with identically shaped balls contains 5 balls with the number 1 on them, 8 balls with the numbers 10 on them, 15 balls with the number 12, and 2 balls with the number 20 on them. If the balls cannot be seen from outside the box, and if one
asked by tg 
Futher maths
Given the vector p=i+2j2k and q=2ij+2k. Find two vectors m and n satisfyin all the followin conditions:m is pendicular to p , n is pendicular to p,m+n=q.
asked by Gideon 
grade 3 math
write a word problem that uses multiplication and the product is 18
asked by loli 
math
9 coins that equal 83 cents
asked by loli 
Trigonometry
Find all solutions of 4(sin(x)**2)8cos (x) 8 = 0 in the interval (2pi, 4pi). (Leave your answers in exact form and enter them as a commaseparated list.)
asked by Holly 
physics
if you continue to lower the water level after recording length at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but the sound gets louder(seond resonance). at this point, by what factor has length increased? why?
asked by fakhrul 
Math
A rectangular field has a length that us 2 meters less than 3 times the width. The perimeter is 188 meters. Find the dimensions of the field
asked by Jim 
Trigonometry
Find all solutions of 4(cos(x))**24 sin(x)5=0 in the interval (6pi, 8pi) I tried to work it out and got: 4(cos**2x)4cosx 9 = 0, but I can't figure out what cosx = from there to finish the problem.
asked by Holly 
Biology
Which of the following best predicts the response of a trait to artificial selection? VA VG standard deviation h2 H2
asked by ChingChong 
Writing
Please grade this and make corrections. ACT writing prompt: The Children's Internet Protection ACT (CIPA) requires all school libraries receiving certain federal funds to install and use blocking software to prevent students from viewing material
asked by Anonymous 
solid mechanics
A piece of material 15 cm long by 2.5 cm square is in compression under a load 100kN. If the modulus of elasticity of the material is 105 GPa and Possion's ratio is 0.25, find the alternation in length if all lateral strain is prevented by the application
asked by ripon 
Animal Physiology HELP!!!!!!!!!!
Please help me!!! What are the answers to these Animal Physiology questions? Urgent..... A decrease in the partial pressure of carbon dioxide in the lungs is referred to as a) Respiratory acidosis b) Hypercarbonia c) Hyperoxia d) Hypercapnia
asked by Sally 
Math
After completing her residency, an obstetrician plans to invest $12,000 per year at the end of each year in a lowrisk retirement account. She expects to earn an average of 6% for 35 years. What will her retirement account be worth at the end of these 35
asked by April 
Trigonometry
Find all solutions of 4 (cos (x)**2)1=0 in the interval (6pi, 8pi). (Leave your answers in exact form and enter them as a commaseparated list.)
asked by Holly 
World History
Under what circumstances does it appear that paleolithic humans first used boats?
asked by Alex 
math!
Suppose that to land on Free Parking in the game of Monopoly, you will need to roll a 3, and to land on Chance you will need to roll a 7. What is the probability that on your roll of two fair, sixsided dice that you will land on either Free Parking or
asked by emma 
Statistics
Of the 5,352 requests for medical records, 4,257 were located within the 20minute time frame established by the supervisor as a qulaity improvement indicator. What is the rate of compliance in answering requests for records?
asked by Karolina 
physicsmagnetism
The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
asked by silent_klr 
Algebra
If y is a positive integer, for how many values of y is 3/2y greater than 1/4 and less than 1/2?
asked by Anonymous 
math
list all numbers from the given set {9,4/5,0,0.25,/3,9.2,/100} that are a) whole numbers b) natural numbers c) intergers d) rational numbers e) irrational numbers.
asked by TINDO 
statistic
A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? The null hypothesis is: he null hypothesis is The die is biased towards the face with six spots. The chance that
asked by Bob 
math
Determine how many 1000 digit numbers A have the following property: When any digit of A, aside from the first, is deleted to form a 999 digit number B, then B divides A.
asked by Steven 
math
Define the function f(x)=2x/(1−x^2). Find the number of distinct real solutions of the equation f^(5)(x)=x.
asked by Steven 
Stats
There are 21,000 students in a MOOC. Each student tests the fairness of a coin (yes, the same coin; the instructor somehow gets Tyche¢s help in getting the coin to each student in turn). Specifically, each student tests: Null: p is equal to 0.5
asked by I need help.. 
child psychology in general
which one of the following words or phrases is most closely related to piagets theory? a.psychoanalytical b.oedipal c.programmed learning d. stage by stage my answer is d
asked by susue 
math
there were 400 tickets for a play. 258 adult tickets at 255 each. 57 senior citizen tickets were sold at 125 each. some were sold at 150 each and the remaining were given free to the performers, friends and relatives. if 758 were collected from the sale of
asked by kitty:) 
HypothesisTest
A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question. The alternative hypothesis is: a) The die is biased b) The chance that the face with six spots
asked by Correct? 
biology
Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5
asked by kate 
english
Need Help getting started.. For the following exercise, you will need to write a short paragraph of your own. Remember to use the grammar guidelines and sentence consolidation strategies of the previous lessons. This might also be a good opportunity to
asked by Josh 
math
A rectangle has a perimeter of 42 cm. One of its sides is 11 cm long. What are the demensions of the rectangle??
asked by Amber 
Physics
A boiler furnace releases 10000.000kJ of heat for each kg of fuel burned and produces dry saturated steam at 10000.000kPa from feed water at 190.000 degrees Celsius. How many kg of steam will be produced for each kg of fuel burned if the boiler had an
asked by Danny 
trig
Find all solutions of cos (x) + 1/2 sec (x) = 3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a commaseparated list.)
asked by Holly 
Algebra
Solve by factoring a^26a+9=0
asked by Dottie 
math
using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.
asked by Scott 
Physiology
Do you think the use of advanced technology like functional MRI will eventually make animal testing obsolete?
asked by Tise 
English
A singing group that began as a way to help military moms cope with wartime anxiety is now bringing cheer to civilians and veterans. The Swingin' Blue Stars formed just after 9/11. Almost 12 years later, the group is still taking its show on the road.
asked by rfvv 
child psychology in general
the main problem with informal theories is they are based on? a.others experiences b.bias c.emotion d.tradition rather than study my answer is b
asked by susue 
child psychology in children
the compensator personaliy type expects his or her child to be > a.endangered b.unruly c.an achiever d.self sacrificing my answer is c the text says your getting a chance I never did,dont let me down,your always got to be first,winning is all that mattters
asked by susue 
child psychology in general
psychological theories sees childrens behaviour as primarily? a.goal oriented b.instinctive c.emotion triggered d. constant my answer is a
asked by susue 
child psychology in general
in conducting experiments the test scientific theories exceptions? a.can be ignored if they are few in number b.tend to disprove or substantially weaken the theory and must be reported c.are included in order to increase the power theory d.suggest that the
asked by susue 
business class
I'll be handling a business class. I don't know how to start and what strategies am I going to use.. Please help... Thank you...
asked by klarmaesen 
math
The area of a triangle is 80 square meters and the base measures 20 meters. Find the number of meters in the measure of the altitude.
asked by vincent 
Grammar
Is this sentence correct? Wife's first time making pumpkin bread.
asked by Anonymous 
Maths
A polynomial ax^3+bx^2+cx+d leaves a remainder 10x+11 upon division by x^21 and also leaves a remainder 6 upon division by x^2+x+1. What are the values of a,b,c,d?
asked by KK 
Grammar
Wife's first time making pumpkin bread. Can I correct like this? His wife made pumpkin bread for the first time. Or This is the first time my wife made pumpkin bread.
asked by Anonymous 
Chemistry Please Help!!
If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a .10 M solution of the conjugate, and why?
asked by Kelly 
PreAlgebra
The sum of 5x^2 + x and 2x^2  3x  1 ?
asked by Celest 
math
Two numbers A and B are graphed on a number line. Is it always,sometimes, or never true that AB < A+B?
asked by Teyonya