Questions Asked on
May 18, 2013

TRIGONOMETRY
Evaluate the expressions: a) arctan(sqrt(3)) a) Arctan(sqrt(3)) So, I know how to find the answers with a calculator, but how do I find it step by step?
asked by Kate 
Chemistry
the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction
asked by Kelly 
chemistry
how many liters of oxygen are necessary for the combustion of 340 g of ethanol (c2h5OH) assuming the raction occurs at STP? no idea how to work this out
asked by parker 
Chemistry
a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid
asked by Kelly 
Chemistry
what is the total molar concentration of all the ions in .040 M solutions of the following salts in water? .040 M KCL .040 M CuSO4 .040 M CaCl2
asked by KellyPlease help!! 
Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
asked by heatherplease help due by midnight!!! 
TRIGONOMETRY
Use the dot product to determine which of the following vector pairs are orthogonal. a. v1 = (5,5) and v2 = (1,1) b. v1 = (154,169.4) and v2 = (88,64)
asked by Kate 
physics
A rod of length 30.0 cm has linear density (massperlength) given by lambda = 50.0 g/m + 20.0 y g/m2 , where y is the distance from one end, measured in meters. (a) What is the mass of the rod? (b) How far from the y = 0 end is its center of mass?
asked by Anonymous 
chemestry
polycarbonate has a density of 1.2 g/cm3. a photo frame is constructed from two 3.00mm of polycarbonate.Each sheet measures 28 cm by 22cm. what is the mass of the photo frame?
asked by andrea 
math
A steel strip, clamped at one end, vibrates with a frequency of 20 Hz and a amplitude of 5 mm at the free end, where a small mass of 2 g is positioned. Find (i) the velocity of the end when passing through the zero position, (ii) the acceleration at
asked by Anonymous 
physcs
A small block of mass m1 = 0.500 kg is released from rest at the top of a curveshaped frictionless wedge of mass m2 = 3.00 kg, which sits on a frictionless horizontal surface as in the figure below. When the block leaves the wedge, its velocity is
asked by Anonymous 
English
essay on once bitten twice shy
asked by kezia 
Physics 1
(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.
asked by Martin 
Physics
Three objects are connected on an inclined table as shown in the diagram below. The objects have masses 8.0 kg, 4.0 kg and 2.0 kg as shown, and the pulleys are frictionless. The tabletop is rough, with a coefficient of kinetic friction of 0.47, and makes
asked by Joeline 
physics
The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance d apart on the same axle (Fig. below). From the angular displacement of the two bullet holes in the disks and the rotational
asked by Anonymous 
geomerty
find the area of a circle circumscribed about a equalateral triangle whose side is 18 inches long
asked by buzz 
geometry
findthe exact area of the region bounded by two concentric circles with a radii of 10 and 6 inches
asked by buzz 
Algebra 2
Find the exact solutions of x^2  (y  12)^2 = 144 and y = x^2. No solution?
asked by Lily 
TEACHER AIDE,CHILDREN, FAMILIES, SOCIETE
1. Larry is a very aggressive fouryearold child. He watches many television programs that contain violence. It’s most likely that A. he will become overactive. C. his behavior won’t change. B. he will become depressed. D. his behavior will become
asked by yani 
Physics 1
(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.
asked by Martin 
physics
¬Calculate the period of oscillation of a simple pendulum of length 1.8 m, with a bob of mass 2.2 kg. What assumption is made in this calculation? (g = 9.8 m s  2) If the bob of this pendulum is pulled aside a horizontal distance of 20cm and released,
asked by Anonymous 
math
An unknown radioactive element decays into nonradioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the halflife of the element? halflife: b)How long will it take for a sample of 100 mg to decay to 51
asked by Rachel 
Sociology of Sports
Would Someone PLEASE HELP? 1.Deviant overconformity is associated with some forms of violence in sports. The roots of this violence are grounded in (d) A. a desire for selffulfillment and personal satisfaction. B.a lack of loyalty to team rules. C.the
asked by Ashley 
ALGEBRA
7300 @ 7% COMPOUNDED SEMIANNUALLY FOR 3 YRS
asked by PHIL 
Algebra II Part 2
Use a graphing calculator to solve the equation 3 cos t=1 in the interval from 0 to 2 p.Round your answer to the nearest hundredth
asked by Karen 
math
A 300 kVA transformer has a primary winding resistance of 0.4 Ω and a secondary winding resistance of 0.0015 Ω. The iron loss is 2 kW and the primary and secondary voltages are 4 kV and 200 V respectively. If the power factor of the load is 0.78,
asked by Anonymous 
math calculus (please help me)
In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in
asked by jam 
Writing
can you check my grammar and spelling? and does it look better? Erin Oldham Calvin Brown 20 March 2013 ASL 2 ASL 2 Research paper I am writing about interviewing three Deaf Persons for my ASL research paper. The first person I interviewed is Christian
asked by Erin 
Algebra II Part 2
The equation h=7 cos{pi/3 t} models the height h in centimetres after t seconds of a weight attached to the end of a spring that has been stretched and then released. Find the times at which the weight is at a height of 1 cm,of 3 cm,and of 5 cm below the
asked by Karen 
reading/math
Hey Mrs.sue, can you answer this question:How does the author establish the setting in the first chapters of the watsons go to Birmingham?
asked by Austin 
Physics
An arrow is fired horizontally from the top of a 40.0m vertical cliff and lands 125 m away. Therefore the arrow was fired at _____ m/s.
asked by Jenna 
TRIGONOMETRY
Can someone please show me step by step solutions? I'd appreciate if you did so I know how you get the answer. Thank you so much! Solve each equation, giving a general formula for all of the solutions: a)2sin^2 x5sinx3=0 b)(cosx(sqrt2/2))(secx1)=0
asked by Kate 
Math
Convert 3¾ % to a decimal.
asked by Denise 
reading
What kind of relationship does Kenny and Joetta have?
asked by Austin 
chemistry
will linear polybutadiene or branched polybutadiene have a higher molar volume?
asked by himani. 
Math
A letter carrier can deliver mail to 112 homes per hour by walking and 168 homes per hour by driving. By what percent is productivity increased by driving?
asked by Denise 
Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
asked by Kelly 
reading
How does the writer in the watsons go to Birmingham make the reader sympathize with Larry Dunn
asked by Austin 
chemistry
what is the normality and nature of the mixture obtained by mixing 0.62 gram of na2co3.h2o to 100 ml of 0.1N h2so4
asked by aditi 
statistics
A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear. The random variable R is the sum of 240 draws at random with replacement from [pick
asked by gerd 
Math
After a 15% pay raise, Scott Walker now earns $27,600. What was his salary before the raise?
asked by Denise 
Math
For example 80 71 43 65 45 is the winning number and 51 69 18 81 37 is the machine number,how do i solve this problem to get the accurate next winning numbers from 190? Tutor me the exact calculation and formula please.
asked by Drey 
hsa practice
Stephanie scored 88, 70, 84, and 72 on her first four science tests. What score does Stephanie need on her fifth science test to receive a mean score of 80? can you give me the steps to solve this im practicing for hsa
asked by anonymous 
math
By what percent is a 100watt light bulb brighter than a 60watt light bulb? (Round percent to the nearest tenth.
asked by Rawn Williams 
math
by what percent os a 100 watt light bulb brighter than a 60 watt light bulb
asked by Nikita 
Algebra 2
Write the expression 13m^8  3m^4 + 4 in quadratic form if possible. m^8?
asked by Lily 
Trigonometry
Given that sin alpha = 15/17 and 360
asked by Ella 
math
40% to 525 what is original amount.
asked by heidi 
M.m.m.campus (chemistry)
Laboratory preparation of carbon dioxide?
asked by Lalan patel 
math
Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? which ratio do I do this under? For example Portion=Rate x Base
asked by Samantha 
French
Could you please tell me whether the following French paragraph is correct? As in, do my verbs agree and is it grammatically correct? Le SacreCouer est une eglise catholique a Paris. Il est tres beau, et tres grand. Au SacreCouer, vous pouvez prenez des
asked by Deidre 
Chemistry
A 12% solution is diluted 1:60. What is the volume and concentration of the final solution? I started off with this 12(1/60) = 0.2% However, how do I get the final volume and concentration? Thanks
asked by freelance 
Algebra 2
State the possible number of imaginary zeros of f(x)= 2x^3  4x^2 + 8x  3. 0,1,3?
asked by Lily 
Statistics
A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet $1 on this game 600 times independently. 3A  Find the expected number of times you win. 3B  Find the SE of the number of times you win. 3C  Find the chance that you lose
asked by Din123 
Math
Kylee bought a pack of 12 cookies. Two thirds of the cookies are peanut butter. How many cookies in the pack are peanut butter?
asked by Sean 
Minima Maxima
Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^24/(1+cos(t)^2) dt x^24/(1+cos(x)^2)= 0 x^24=0 x^2=4 x= +/ 2 So I got relative maximum as 2 and 2. And relative minimum as zero. However, when I graph it on
asked by Eric 
life orientation
identify one environmental or human factor that causes ill health or accidents or disasters within your community or any other community within south africa
asked by hensley 
science
A scientist experiments on two different pairs of objects. During the experiment, the objects in one of the pairs are brought into contact with each other; the objects in the other pair are brought close together, but they do not touch. The scientist then
asked by Anonymous 
math
Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.
asked by lindsay 
Physics Please Help
A point charge of charge 1 mC and mass 100 g is attached to a nonconducting massless rod of length 10 cm. The other end of the rod is attached to a twodimensional sheet with uniform charge density σ and the rod is free to rotate. The sheet is parallel
asked by Mathslover 
Math
If a number increases from 47 to 70.5, what is the rate of increase?
asked by Denise 
accounting
Discuss how the net promoter score is calculated. Show an example of a calculation of a net promoter score (use the data below). What does this score mean specifically in this example? Discuss how the net promoter score can assist in the value of a
asked by Denise 
China And India culture
compare and contrast the legacies of cultural syncretism in china and India and the Americas with the resistance to cultural change westerners encounter
asked by Regina 
math
ABC is a triangle with a right angle at A. M and N are points on BC such that AM is the altitude, and AN is the angle bisector of ∠BAC. If CN/NB=21, what is CM/MB?
asked by Gandu man 
Statistics
A group of 30 people consists of 15 children, 10 men, and 5 women. Tom and Jerry are two of the men in the group. Five people are picked at random without replacement. 2A  Find the chance the first person picked is a man, given that the fourth and fifth
asked by Din123 
physics
explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth.
asked by Kye 
science
List the energy conversions in these situations. A drum set causes many dishes to rattle. Temperature differences cause wind.
asked by Anonymous 
Statistics
A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet $1 on this game 600 times independently. 3A Find the expected number of times you win. 3B Find the SE of the number of times you win. 3C Find the chance that you lose more
asked by Pebble 
Science
Explain the law of motion needed to solve thisproblem . On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force fo 180N. What is the acceleration of gravity on Planet zorg? Predict how the motion of this object would change if on earth.
asked by Kye 
L.O
Critically discuss 10 ways in which the environmental health hazards can impact negatively on one's health
asked by LOLITA 
Physics
The radius of planet X is 5.0 bleems. It takes 4 earth years to complete it's orbit. Another planet, Z, orbits the same sun and has an orbit with the radius of 12 bleems. How long does it take for planet Z to complete an orbit?
asked by Jeremiah 
Chemistry
How much 3M H2SO4 can be made from 20ml of 12N H2SO4?
asked by freelance 
math
If the bearing fron H to G is 098 degrees, what is the bearing of G from H
asked by lindsay 
business ethics
Find two models for ethical decision making, or for decision making in Where do they differ? What is missing in each model? What is the difference between a “framework” and a “decision making model”?
asked by kim 
statistics
Rank the three events below in increasing order of probability. For example, if you choose â€œA B Câ€, you are saying that A has the smallest chance, B has more chance than A but less chance than C, and C has the biggest chance. [If you think that
asked by gerd 
Math help urgent
I have a few questions that i need help with so can someone pleese help me thanks:) 1. represent each with an ineqaulity a.) time spent on the activity can be at most 13 mins b.) the volume of the container must be a minimum of 1.8 L and a max of 2.5 L 2.
asked by Louis 
Algebra
Calculate elements the listed element for the product matrix. matrix[1, 2, 3_3, 4, 0_9, 7, 8_9, 3, 2]Xmatrix[11, 7, 9, 5_5, 9, 1, 6_4, 2, 3, 8] Can someone please help me with this. I'm desperate.
asked by Brianna 
Chemistry
In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.
asked by Praise 
Math 4 questions
I posted these questions earlier but noone answered them and i really need help so can someone help me. 1. represent each with an ineqaulity a.) time spent on the activity can be at most 13 mins b.) the volume of the container must be a minimum of 1.8 L
asked by Louis 
math
Three of every seven sales transactions at Dollar Discount are on credit cards. What percent of the transactions are not on credit card sales?
asked by Anonymous 
math
22. Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? (Points : 2)
asked by stephanie 
physics
I need help devloping a procedure: Using several bags filled with different amounts of the same item, take the mass of each and develop (and enact) a procedure to determine the mass of a single item....This procedure is supposed to model Milikans oil drop
asked by HELP 
physics
A hollow steel shaft has an external diameter of 120 mm and is 10 mm thick. It is coupled to a solid shaft of the same material, 100 mm in diameter. If the length of the hollow shaft is 960 mm, find the length of the solid shaft, so that the total angle of
asked by Anonymous 
Math
graph the points. Plot Cvalues on the xaxis and Fvalues on the yaxis. connect the points with a line
asked by Sebastian 
math
Solve the equation 8 cos^2 X 2 =0 given that 180< or equal to X
asked by lindsay 
college of cape town
A gas at 273 kelvin expands by 0,1 cubic metre if it is heated through 50kelvin. Calculate the original volume at constant pressure.
asked by alistair jacobs 
MATHS!!!Please HELP..:'(
For a set of numbers T, we say that T has distinct subset sums if all distinct subsets of T have distinct sums. How many subsets of {1,2,3,4,5,6,7,8} have distinct subset sums?
asked by PLEASE HELP~ 
Phoneix
Jarman consulting inc. provides financial and estate planning services on a retainer basis for the executive officers of is corporate clients. it incurred the following labor costs on services for three corporate clients during march 2006. Driect labor
asked by Sandy 
chemistry
which orbitals have centre of symmetry
asked by kuldeep 
Algebra 2
Solve the system: y^2  4x^2 = 4 and y = 2x. (1,2)?
asked by Lily 
Algebra II Part 2
Use an angle sum identity to verify the identity cos 2 0=2 cos 01
asked by Karen 
algebra
Find all real solutions. SR (x^2+3x+6)=4
asked by Jamila 
Chemistry
how many outer shell electrons does a carbon atom have using periodic table?
asked by Timofey 
math
after7rounds is a knockout chess tournament,the winner was announced.How many contestants were there have been in the tournament?
asked by lian 
math
What is 7,000 decreased by 62%
asked by Samantha 
math
What is 1250 divided by 23???
asked by john 
Chemistry
A solution of NaCl and glucose gives a freezing point of 0.95°C. It contains 140 mOsmol glucose/L. Give concentration of NaCl in milliosmoles per liter and molarity. Thanks
asked by freelance 
Spanish
1) Mis abuelos viven en Manhattan. ______ apartamento es grande y bonito. A. Sus B. Su C. Nuestros D. Nuestro I said A 2) Para la comida, ¿ _______ Evangelina y tú el pescado o el bistec? A. prefieren B. prefiero C. prefieres D. prefiere I said D 3)
asked by Eri 
Algebra
The three interior angles in a triangle are x ∘ , (2x+24)∘ and (3x+48)∘ . What is the value of x ?
asked by Jimmy 
mts 106
Find the gradient at the point (1,1) of the tangent line to the curve x^2+y^23x+4y3=0.
asked by tunde 
Math
Convert 12.6 to a percent.
asked by Denise 
Math
Convert 53 to a percent.
asked by Denise 
Math
Convert 217% to a mixed number.
asked by Denise 
physics
Marks: 1 A car merges onto the highway from rest in 10 seconds. The final speed of the car is 60 mph. Estimate the acceleration of the car.
asked by ben 
Physics
2 factors that increase static friction? Could it be weight or the ground?
asked by Kate 
LIFE ORIENTATION
DESCRIBE THE LIFESTYLE DISEASE & EXAMPLES & FACTORS THAT CONTRIBUTE TO THE DISEASE
asked by MABULE 
mathematic
In surveys about sensitive topics, respondents are sometimes given ways to “hide” their answers from the surveyor. In a survey of taxpayers, one of the questions is, “Did you cheat on your taxes?” To answer, the respondent is asked to toss a coin.
asked by Anonymous 
Maths
Find the largest possible value of n, such that there exists n real numbers x1,...,xn which satisfy xi−xj>1/100(1+xixj) for all values of i≠j.
asked by Pandey ji 
help
a store does a display of 200 balls, he places them in the shape of a square pyramid. the bottom layer has 64 balls for each consecutive layer of balls, one ball is placed where 4 balls meet. how may layers will be in the pyramid? how many will be left
asked by Anonymous 
math
Let S be the set of {(1,1),(1,−1),(−1,1)}lattice path which begin at (1,1), do not use the same vertex twice, and never touch either the xaxis or the yaxis. Determine the largest value of n such that every path in S which ends at (n,n) has length at
asked by Gandu man 
Math
I posted these questions earlier a lot of times but noone answered them and i really need help so can someone help me. i don't want all the answers, can someone just do like the first 2 so i get an example of how to do them. thanks 1. represent each with
asked by Louis 
Introduction of Psychology
When physical energy has resulted in a response in asense organ, it is clear that:
asked by Anonymous 
physics
In a string instrument.If I pluck the same string at different places,will the frequencies be the same?Can someone explain it to me?
asked by Yun 
hsa practice
2.6, −5.2, 10.4, −20.8, . . . 6th term? what is an easier way to find this?
asked by anonymous 
math
any helpful hints for solving equations?
asked by stacy 
Multiplication
what is 1250* 2987??
asked by john 
Math
Convert 422% to a decimal.
asked by Denise 
Math
Convert 33/4 to a percent.
asked by Denise 
Math
By what percent is a 100watt light bulb brighter than a 60watt light bulb? (Round percent to the nearest tenth.
asked by Denise 
Math
Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month?
asked by Denise 
English
Can someone give an example of Campaign Speech that involves about a recent celebrity. Thank you in advance. Sincerely, Kink
asked by Kink 
Algebra II Part 2
Verify the identity cot{0pi/2=tan 0
asked by Karen 
Introduction to Psychology
Drug addication occurs when: a.an individual will lie about it.
asked by Anonymous 
SIMONSAY, PLEASE HELP
A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E . We start with the classification of the degrees of freedom as "free"
asked by AMK 
hsa practice
when giving a table and they ask for an equation i know how to find the slope by picking to points and doing the formula y2y1/x2x1 but how do you find the yintercept when they don't give you any pints with (0,?)
asked by anonymous 
math
What is the hardest part of solving equations?
asked by stacy 
ap calculus
Solve the integral ∫csc(z+π/6)cot(z+π/6)dz
asked by sophie