Questions Asked on
May 11, 2013

Calculus and Vectors
THE VECTORS a  5b AND ab ARE PERPENDICULAR. IF a AND b ARE UNIT VECTORS, THEN DETERMINE a dot b
asked by Johnny 
Physics
Simple Machines A simple wheel and axle has a wheel diameter of 2.3m and an axle diameter of 92mm. If an effort of 26N is required to raise a mass of 16 kg what is the efficiency of the machine? A 2.46% B 95.3% C 24.1% D 20.1% E 65.5% I am having a
asked by Danny 
Math
Salim sells fax machines that come in Standard and Enhanced models. The Standard model sells for $325 and the Enhanced model sells for $385. If Salim sold a total of 35 units and took in $12,575, how many of the Enhanced model did he sell?
asked by Anonymous 
math 160(buss calculus)
The demand function for a product is given by p = 10,000 [1 − (5/5 + e^−0.001x)] where p is the price per unit (in dollars) and x is the number of units sold. Find the numbers of units sold for prices of p = $1000 and p = $1500. (Round your answers to
asked by abc 
ThermoPhysics
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 20.5 atm. The process is adiabatic and the air–fuel mixture behaves as a diatomic ideal gas. (a) By what factor does the volume change? Vfinal = Vinitial
asked by CheckingMyAnswers 
Macroeconomics
If Mary takes money from her savings account and buys a Tbond from Jody with that money, it's: A. An example of expansionary monetary policy. B. An example of contractionary monetary policy. C. An example of neutral (neither expansionary nor
asked by Ashley 
MACRO
Suppose last year's inflation rate was 5%, but Wall Street analysts expect this year's interest rate to be 4%. Which of the following correctly describes people's beliefs according to rational or adaptive expectations theories? A.) According to rational
asked by Anastasia 
Chemistry
The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees Celcius and a total pressure of 752 torr. What is the partial pressure of the oxygen gas?
asked by JeNae 
math probabilty please help
You spin the spinner twice. draw a tree diagram and list sample spaces to show the possible outcomes. From that answer questions 1,2 and 3. The spinner is 4 equal parts for a, b, c ,d I know the tree diagram you Have a,b,c,d, and from each of those
asked by B6 
chemistry
Can a solution of CrCl3 be stored in an aluminum container?
asked by lea 
physics
A plane progressive wave is represented by the wave equation: y=0.1sin(200 ðt20ðx/17) Where y is in millimetres, t is in seconds, and x is the distance from a fixed origin, O, in metres. Find: The frequency of the wave The wavelength of the wave The
asked by rare 
Math
Find the zscores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
asked by Teresa 
Math
Find the zscores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
asked by Teresa 
Physics
An electron in a television CRT moves toward the front of the tube with a speed of 7.5x10^6 m/s. A magnetic field of 0.04T (on a 50 degrees angle) causes the electrons to accelerate. Determine the acceleration
asked by HELP 
life orintation
suggest 5 recommendations on how to address the environmental problem within your community or any other community within south africa and globally
asked by matse 
CHEMISTRY HELP!!!
A silver ring is dropped in a solution of Pb(NO3)2 for a certain period. Will you find it intact? Explain.
asked by lea 
To:: bobpursley
sorry but i just had one question to my previous question. Since the answer to my previous question is that her sales are 8000, is it 8000 dollars? like $8000 were her sales?? Thanks :):)
asked by Olly 
Math
5 distinct positive reals form an arithmetic progression. The 1st, 2nd and 5th term form a geometric progression. If the product of these 5 numbers is 124 4/9, what is the product of the 3 terms of the geometric progression? Note: The phase "form an
asked by Shin 
Priciples of Marketing
Jose suarez has been promoted to sales manager at a new firm and is trying to come up with a salesforce compensation method. He would like to have selling expenses relate directly to sales resources, a highly aggressive sales force, and minimization of
asked by Stumped 
math
the bearing of Y from X is 160¤ and the bearing of Z from Y is 060¤. find the bearing of X from Z.
asked by samuel 
algebra
The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800  50x . Which of the following statements about the tank is true? It is filling at a rate of 50 gallons per hour. • It is emptying at a rate of 800
asked by lisa 
physics
A small 8.00g metal ball is suspended by a 14.0cm long string in a uniform electric field of 1200 N/C [right] (like in question #20). If the ball has a charge of 3.5x10^5 C, what angle will the string make in the electric field?
asked by HELP 
chemistry
Balance the following redox reaction. MnO4 (aq) + Fe (s) > Mn2+ (aq) +Fe2+ (aq)
asked by Lana 
math
A grocer mixes a premium blend of coffee worth $17/kg with a coffee blend worth #7/kg. A mixture of 36 kg worth $11/kg is produced. How many kilograms of each type of coffee are included in the mixture?
asked by mo 
Chemistry
Determine the theoretical and percent yield of hydrogen gas if 78.5 g water undergoes electrolysis to produce hydrogen and oxygen and 3.23 g hydrogen is collected.
asked by Charles 
math
Points A and B are on the top and bottom edges of a cylindrical roll of paper of height 8 and circumference 12. A and B are diagonally opposite each other. The paper is cut along line C and opened out. How far apart are A and B on the flat surface?
asked by Bob 
Physics
A singly charged positive ion has a mass of 5.2x10^27 kg. After being accelerated from rest through a potential difference of 750V, the ion enters a magnetic field of 0.65T. Calculate the radius of the path of the ion in the field.
asked by HELP 
Civics
which of the following is not an authoritarian form of government? A. Totalitarianism B. Absolute monarchy C. Dictatorship D. Direct democracy Answer is "C"
asked by Jen 
math
Suppose that China’s population policy is modified so that every family could have children until either a boy is born or until a maximum of four children are born, whichever comes first. Assume that every family chooses to have as many children as
asked by emma 
phy
A popular brand of pressure washer claims to deliver 330 litres per hour of water at a pressure of 80 bar, drawing 1400 W of electrical power in the process. Pressure washers of this type consist of an electric motor that drives a small compressor to
asked by Fred 
MATH combinatorics HELP!!!!!
Determine the least positive integer n for which the following condition holds: No matter how the elements of the set of the first n positive integers, i.e. {1,2,…n}, are colored in red or blue, there are (not necessarily distinct) integers x,y,z, and w
asked by Bob K. 
Vectors
THE VECTORS a  5b AND ab ARE PERPENDICULAR. IF a AND b ARE UNIT VECTORS, THEN DETERMINE a * b
asked by Johnny 
Spanish
1. Mi padre no es bajo. Es ______. A. alto B. feo C. paciente D. gemelo I said A. 2. Me gustan los perros grandes. No me gustan los perros __________. A. jóvenes B. menores C. canosos D. pequeños I said D. 3. Mis hermanos son gemelos. _______ A. son
asked by Eri 
Physics
The cylindrical bar in the figure has a total length L=1.2 m, a diameter d=15 mm, and is confined by fixed supports at the walls A and B. A concentrated axial load FC=30 kN is applied to the bar at point C as indicated in the figure, with LAC>LBC. The bar
asked by XYZ 
CALC
the productivity of a person at work (on a scale of 010) is modeled by a cosine function: 5cos (pie/2t) +5, where t is in hours. If the person starts work at t=0, being 8:00 am, at what times is the worker the least productive? a) 12pm B) 10 am and 2pm C)
asked by samantha 
algebra
The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800  50x . Which of the following statements about the tank is true? It is filling at a rate of 50 gallons per hour. • It is emptying at a rate of 800
asked by lisa 
physics
A steel bar of length L=2 m, with modulus E=200 GPa and constant cross sectional area A=200 mm2 is constrained between two walls at its two ends A and B. A distributed axial load, fx(x)=−p0(1−3x2L), with p0=200 kN/m, is applied to the bar only in the
asked by aki 
Chemistry
If 1 mol L of 2.0 mol L hydrochloric acid is diluted to form a solution with concentration 0.2 mol L, A. What is the final volume? B. how much water must be added to the original acid? Use C1V1= C2V2, thanks in advance
asked by Jiskhaa 
Physics
We discussed in lectures that traveling Electromagnetic waves in vacuum of the form E⃗ =E0xˆcos(kz−ωt),B⃗ =B0yˆcos(kz−ωt) satisfy all 4 Maxwell's equations. In lectures, I showed that an application of the generalized Ampere's Law (closed loop
asked by Anonymous 
Math
The hexagon below is made up of six equilateral triangles with sides of 6 centimeters each. The height of each triangle is 5.2 centimeters. What is the area of the hexagon
asked by Lee 
Grammar
For each of the following sentences, choose the correct pronoun from the pair given in parentheses. 1. We are going to play stickball in the street. (Who, Whom) would like to play first base? 2. The best pitcher would be (who, whom)? 3. (Who, Whom) would
asked by Anonymous 
statistics
find the area between z=0 and z=0.9 under the standard normal curve is
asked by Linda 
TRIG
What is the 6th term of the geometric series with a1= 5 and r=2.5
asked by Alex 
8th Math
Find the percent of increase. Round to the nearest tenth, necissary from 47 lb to 52 lb.
asked by rockrboiluvr14 
environment
NAME TWO COMMUNITY ORGANIZATIONS THAT ARE INVOLVED IN SUPPORTING OR GIVING ADDRESS TO GLOBAL WARMING
asked by Anonymous 
Math algebra
Let N be the sum of all positive integers q of the form q=p^k with prime p, such that for at least four different integer values of x from 1 to q, x^3−3x≡123(modq). What are the last 3 digits of N?
asked by Bob 
Grade 12 Calculus
solve cosx= (squareroot3)/ 2 where 0
asked by Maria 
disease
Provide five ways in which you critically discuss how lifestyle heart disease behaviour impact on the teenager
asked by Anonymous 
physics
a 4kg roller is attached to a spring of force constant 100N/m. it slides over a frictionless horizontal road. the roller is displaced from equilibrium position by 10cm and then released. its maximum speed will be?
asked by sumit 
College Algrebra Math 133 unti 1 IP 1
Suppose the width of a rectangle is 5 inches shorter than the length and that the perimeter of the rectangle is 80 inches. The formula for the perimeter of a rectangle is P=2L + 2W. Set up an equation for the perimeter involving only the L the length of
asked by Dana 
Math Algebra
k so when i posted this earlier, i didn't understand how to do it the way that writeacher showed me so can someone else help, thanks Max spends 60% of his pay on car expenses and 12% on fast food. If Max spends a total of $518.40 per month, what is his
asked by Hanah 
Math
1. The expression log 5x is equivalent to 2. Write the equation of a polynomial whose sum of the roots equals 3 and the product of the roots equals 9\2? P.S.  I have been trying to solve these problems on my own and have not been successful at it. Can
asked by Shannon 
TRIG
the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years
asked by Alex 
Math (Algebra)
An elevator named L in "63 Building" in Seoul is notorious for its low speed. It takes 3 seconds for L just to move one floor. It takes another 20 seconds for it to have its door open and close automatically. What is even more frustrating, is that the
asked by Shin 
math:quick help
Let Fn be the nth number in the Fibonacci Sequence. Consider the 3 points (F30,F31),(F32,F33),(F34,F35) in the Cartesian plane. You are allowed to repeatedly apply the following operation: Let P be any one of the three points in the plane and let Q,R be
asked by Sambaran G. 
Biology
Consider the closeup view of a segment of DNA undergoing transcription from left to right. Transcription begins at and includes the G/C base pair shown in bold green type.
asked by andrea 
life orientation
Discuss in a paragraph of 150 words ways in which one can take responsibility to provide safe and healthy living environment
asked by lucrisha 
Math
Went ahead and did the HW the teach recommended but she did not post the answers and I would like to see if im on the right track. Problem 1: Are the vectors (2,−1,−3), (3, 0,−2), (1, 1,−4) linearly independent? Problem 2 : Is the set {x E R^4 :
asked by John Rose 
MAT104 (Math)
Listed below are five female and five male Wimbledon tennis champions, along with their country of citizenship and handedness. Female Male Stephi Graf, Germany, right Michael Stich, Germany, right Martina Navratilova, U.S., left Stefan Edberg, Sweden,
asked by Neal 
life orientation
5 ways in which teenage pregnancy impact on the community
asked by Nombuso 
life orientation
in 1015 lines critically discuss 5 ways in which the human problem impact on the community.provide relevant sources to support your claims.
asked by muneiwa 
Math
Mike scored 85, 88, 87, 93, 95, 92, and 83 on his math tests. What is the least he can score on the next test if he wants to maintain a 90 average? PLZ HELP ME!!!!!!!! I'm so confused
asked by Abigail 
cis106
Explain the differences among LANS, WANS, CANS, and MANS.
asked by vicki 
math
Giselle has $5.90 dollars in quarters and nickles. If Giselle has 16 more nickles than quarters, how many quarters does Giselle have?
asked by S 
Math
I posted this question earlier: a.) Maddie works at a desighner store. She earns $1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned $2725. Use your equation to show what her sales were
asked by Olly 
algebra 2
which point is a solution to the following systems of inequalites 4x+ 5y> 20 8x + 3y < 24
asked by gege 
TRIG
determine the sum of the first 100 even integers SHOW YOUR WORK
asked by Alex 
TRIG
what is the explicit formula for the sequence 3,7,11,15
asked by Alex 
TRIG
in an arithmetic sequence a1=4 and d=8 which term is 428 Show your work
asked by Alex 
MATHS!!!Please HELP..:'(
What is the coefficient of x^4 in (x^2−x−2)^7?
asked by HELP!!! 
algebra 2
gary has walked 305 meters, and continues at a rate of 1 meter per second. Mary has walked 113 meters, and continues at a rate of 3 meters per second. In how many seconds will they have traveled the same distance.
asked by gege 
Math
The expression sin 25° cos 47° + cos 25° sin 47° is equivalent to (1) sin 22° (2)sin 81° (3) cos 22° (4) cos 81°
asked by Shannon 
science
a stone of mass 50g is being rotated in a circle of r 50cm with a uniform speed of 2m\s. what is the acceleration of the stone
asked by swetha 
math
Suppose that you learn, prior to your trip to British Columbia, that gasoline will cost $1.50 (in Canadian dollars) for every liter you purchase. You know from checking the Internet that 1 liter is equivalent to 0.26 gallons and the currency conversion
asked by emma 
math
Suppose that you learn, prior to your trip to British Columbia, that gasoline will cost $1.50 (in Canadian dollars) for every liter you purchase. You know from checking the Internet that 1 liter is equivalent to 0.26 gallons and the currency conversion
asked by emma 
science
vertical distance equation for a freely falling object
asked by Anonymous 
physics
problem E2_2 Strain, boundary conditions, displacement and elongation: Part I Plz help.
asked by jojo 
math
If (8, 7) are the coordinates of a point on a line that has slope –3, what is the ycoordinate of the point on the line at which x=1
asked by patty 
Physics
A car that was initially at rest reaches a final speed of +50.0 m/s over a displacement of +55.0 m. What is the magnitude of the acceleration? Find the time it took to travel the first 55 m.
asked by Jenna 
Algebra 2
Find the equation of the asymptotes for the hyperbola defined by the equation: ((y + 4)^2 / 36)  ((x  3)^2 / 25) = 1
asked by Tristan 
physics(mechanics)
how does the engines get cooled when the vehicle moves in a hill ramp.?i ask this question because its said that cooling fans are drived by the rotation of the engines sothat the cooling fans are mounted in the engine casing.If that's is the case then at
asked by NANDHU 
Grade 12 Calculus
I need helping in filling in the blanks/ the angle formed at the centre of the circle by two radii is the _______ angle. cos delta, sin delta, tan delta are known as the ___________trigonometric ration cos (pie/2  x)=sinx is an example of a ________
asked by Thomas 
physical science
How to unscramble this word isarntucio
asked by lil dee 
urrrrrrrrrrgeeeeeeeeeeeeeeeeeent maths
What is the coefficient of x^4 in(x^2−x−2)^7?
asked by Anubhav 
solid mensuration
A cylindrical mug of hot chocolate measures 9.2 cm in diameter and has a height of 12.6 cm. The top 2.5 cm of the mug is filled with whipped cream; the rest is hot chocolate. Rounding to the nearest mL, how much hot chocolate is in the mug? (1 cubic
asked by Anonymous 
Chemistry
Make a solution of the following: 4ml of 0.5m cupric sulphate pentahydrate. 5ml of 250mm cupric sulphate pentahydrate. and 6ml of 125mm cupric sulphate pentahydrate.
asked by Aondoakaa 
project
i need to write projec about travel guide to Libay ?
asked by omar 
Biochemistry
what's transcription?
asked by andrea 
life orientation
5 ways in which poverty impact on the community
asked by Nombuso 
Physics
How long does it take to deliver 315 J of energy to 0.850 cm^2 of a wall that it hits perpendicularly?
asked by Holden 
geometry
Suppose θ is an angle strictly between 0 and π 2 such that sin5θ=sin 5θ. The number tan2θ can be uniquely written as ab √, where a and b are positive integers, and b is not divisible by the square of a prime. What is the value of a+b?
asked by Anonymous 
life orientation
indicate at least 3 references that you have used in this assignment
asked by matse 
Raynaud's
Hey I want to shorten this paragraph out which tells what Raynaud's is, can anyone please simplify it and make it shorter thanks? Raynaud's disease occurs when the small arteries (arterioles) that serve the fingers, toes, ears, or nose go into spasm. When
asked by Shreya 
algebra
Find a simplified value for x by inspection log9 81 = x
asked by shel 
english
write a newspaper report about ..A lorry has shed load of fruit on the motorway.The traffic is standstill.... i wrote this....................................A lorry has shed its load of fruits while taking action to avoid another car on the M11 motorway
asked by kina 
Math
Max spends 60% of his pay on car expenses and 12% on fast food. If Max spends a total of $518.40 per month, what is his monthly pay? (let x be his pay, use algebra)
asked by Hanah 
Math 1 question
a.) Maddie works at a desighner store. She earns $1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned $2725. Use your equation to show what her sales were that month Please help, thanks :)
asked by Olly