omar
Most popular questions and responses by omar
physics
a car, moving at 100 mi/hr, passes a stationary police car whose siren has a frequency of 500 Hz. what is the frequency change heard by observer in the moving car as he passes the police car? the velocity of sound in air is 343 m/s. ( 1 mi= 1.609 km).
asked on May 30, 2011 
physics 1
) An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s (Fig.1). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again.
asked on March 18, 2017 
chemistry
Consider the first order reaction A > products where 25% of A disappears in 24 seconds. What is the half life of this reaction? ...i thought it would just be doubled but it isn't. i'd appreciate an explanation.
asked on April 29, 2010 
Physics
Two workers are sliding 310kg crate across the floor. One worker pushes forward on the crate with a force of 440N while the other pulls in the same direction with a force of 230N using a rope connected to the crate. Both forces are horizontal, and the
asked on November 21, 2014 
Physics
You pick up a 2.5kg can of paint from the ground and lift it to a height of 1.7m .How much work do you do on the can of paint? You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this
asked on February 7, 2014 
physics
a 12 kg sled is pulled horizontally with a force of 82 N. the coefficent of the kentic friction of the sled is 0.42. draw a FBD of the sled.
asked on April 3, 2011 
accounting (balance sheet, retained earnings...)
Problem P35A On September 1, 2002, the account balances of Rijo Equipment Repair Corp. were as follows: Nbr: Debits Nbr: Credits 101 Cash $4,880 154 Accumulated depreciation $1,500 112 Accounts receivable 3,520 201 Accounts payable 3,400 126 Supplies
asked on October 29, 2008 
algebra
The ratio of the number of pencils to pens is 5 : 7. There are q pens. Express the number of pencils in terms of q.
asked on December 4, 2018 
math
36 students need to be divided into teams of equal size. How many different ways can the students be divided (assuming each team must have more than 1 member)?
asked on January 5, 2011 
OChem
A solution consisting of water and ethanol is found to have a refractive index of 1.3541 at 20 degrees C. The refractive indices at 20 degrees C of water and ethanol are 1.3330 and 1.3610, respectively. Determine the molar composition (in percent) of the
asked on October 26, 2011 
Physics
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 34.0∘ below the horizontal and the chair slides along the floor. Using Newton's laws, calculate
asked on November 20, 2014 
Chemistry
I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a
asked on October 6, 2010 
chemistry
You want to prepare 500 ml of 1.0M acetic acid from a 17.4 M stock solution.What volume of stock solution is required?
asked on November 28, 2015 
math
123b
asked on September 16, 2015 
Math ASAP
Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism? (the picture of the shape looks like a pentagon but the rectangle is much
asked on August 26, 2013 
Physics
density of ice 917 kg/m^3, density of sea water is 1025 kg/m^3, a piece of ice floating has a volume of 5.2 m^3, what is the weight of the heaviest bear the ice can support without sinking?
asked on November 29, 2010 
chemisrty
how many grams of cai2 are present in 3.28 moles? Can someone explaine how to do this question as well?
asked on January 24, 2013 
Math
A bottle of juice holds 3/8 gallon when it is full. If 1/3 of the juice has been poured out, how much juice is left in the bottle?
asked on November 20, 2013 
physics
object A exerts a gravitational force of magnitude 8.2 x 10^10 N on object B. determine the magnitude of the gravitational force if, simultaneously, the separation distance is tripled, mA increased by 4 times and m8 is halved. explain your reasons and
asked on March 31, 2011 
chemistry
90Sr is one of the harmful radionuclides resulting from nuclear fission explosions. It decays by a firstorder process with a halflife of 28 years. How many years would it take for 99.99% of a given sample released in the atmosphere to disintegrate?
asked on April 29, 2010 
physics
a 1500 kg car travelling at 16.7 m/s to the south collides with a 6300 kg truck that is initially at rest at a stop light. the car and the truck sticks togetherand moves together after the collision. what is the final velocity of the twovehicle mass?
asked on May 30, 2011 
algebra
simplifying exspreesions
asked on April 27, 2008 
stoichiometry
What mass of solid aluminum hydroxide can be produced when 50.0 mL of 0.200 M aluminum nitrate is added to 200.0 mL of 0.100M potassium hydroxide?
asked on February 26, 2008 
business and society
I need to find 3 business in my comunity: one that is formed as a sole proprietory, one that is formed as a general partnership, and one that is formed as a corportion. Identify the business and explain what characteristic of the business form led the
asked on October 7, 2007 
java programming
the learner is asked to write a program using java with user input that caculate and displays, the number of months it will take the user to save an amount of money. the user must enter the
asked on November 17, 2015 
Math
Admission cost to a theatre are adults $5,children $2. If 1000 people paid to enter the theatre and the total receipts were $3800. How many adults attended ?
asked on May 10, 2019 
Burnhamthrop Chemistry
initially 0.25 mol of water vapour and 0.20 mor of carbon monoxide are place in a 1.00 L reaction vessel. at equilibrium spectroscopic evidence shows that 0.10 mol of corbon dioxide is present calculate K for the reaction
asked on October 31, 2015 
Geomatry
A pilot flying at an altitude of 3500 feet sees a baseball field at an angle of depression on 35 degrees. what is the pilot's approximate horizontal distance, x, from the baseball field at this point? round your answer to the nearest foot.
asked on April 26, 2013 
business
Let's say that you and two partners want to start a company that specializes in special occasion gift baskets for individuals and corporate clients. You want to have a storefront in the local shopping mall or shopping area, as well as a vertual starfont on
asked on October 7, 2007 
chemistry
formic acid is a monoprotic acid with a ka at ml solutionof m of formic acid solution is titrated with m naoh what is the ph at the equivalence point
asked on March 29, 2011 
science
how do different liquids affect egg shells? Sounds like a worthy science project. Why don't you try some liquids and find out? Some might dissolve or soften them, some will change their color. wwell it depends on what type of liquid your useing like soda
asked on January 28, 2007 
math
Lolita saved $ 5000 in a saving account which pays 12% interest compounded monthly. Eight months later she saved another $ 5000. Find the amount in the account two years after her first saving.
asked on June 7, 2016 
physics
a sound wave has frequency of 631 Hz in air and a wavelength of 0.54m. what is the temperature of the air? assuming the velocity of sound at 0 degree celcius is 334 m/s. answer in units of celcius.
asked on May 30, 2011 
Calculus
Given that x=cos^2t and y=ln(sint) find d^2y/dx^2 at the point t=π/4
asked on November 20, 2016 
Math ASAP
Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism?
asked on August 26, 2013 
trig
Find the exact value by using a halfangle identity. cos 22.5 degrees
asked on October 11, 2011 
Chemistry
What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH
asked on March 29, 2011 
2nd grade,science
list four things all living things do
asked on October 31, 2010 
chemistry
help balance this redox equation: HNO3 + Zn(s) NO(s) + ZnO ...i know i need H2O and possibly H+
asked on April 11, 2010 
MATH
FIND Y" if Y=ln(sec(x)+tan(x))
asked on November 22, 2009 
calc
Find the point on the graph of y = x2+1 that is closest to the point (3,1). d = √[(x3)^2+(y1)^2] d = √[(x3)^2+(x^2+11)^2] d = √[(x3)^2+(x^2)^2] d = [(x3)^2+x^4]^1/2 d' = 1/2 [(x3)^2+x^4)^1/2 [2(x3)+4x^3] 0 = [1(2x6+4x^2)] / [2√(x3)^2+x^4]
asked on March 17, 2016 
statistics
2. Find the variance and standard deviation of the following sample. 0 5 3 6 4 4 1 5 0 3
asked on October 7, 2015 
chemistry
what is the mass (by difference) of a sample if the initial mass of the sample in the bottle was 29.89g and the final mass of the bottle and sample was 22.01g ?
asked on December 4, 2014 
Algebra 2
Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn! h(x)=x^29/x^24x+3
asked on March 28, 2014 
physics
A ball is shot upward from the ground with an initial velocity of 12.0 m/s, along a yaxis that extends upward and that has its origin y = 0 on the ground. How much time does the ball take to move upward from y = 3.00 m to y = 5.00 m?
asked on September 12, 2013 
Math ASAP
Base Area: 22 square inches Lateral Surface Area: 308 square inches What is the Surface Area of the hexagonal prism?
asked on August 24, 2013 
Chemistry
What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH
asked on March 29, 2011 
possessive nouns
the chirps of the baby birds are quiet.
asked on January 13, 2011 
vector calculus
find an equation for the plane that contains the line x = 2t8, y=3t +3, z= 5 t, and the point (5,4,0)
asked on April 26, 2010 
Stat
the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
asked on December 30, 2008 
chem
Explain the fact that acetic acid can be extracted quantitatively from ether solution by dilute aqueous sodium hydroxide solution.
asked on September 23, 2008 
english
how meny sea creaturs are dead
asked on December 8, 2015 
Physics
The MAVEN spacecraft, a NASA mission that is studying the Martian atmosphere, launched from Cape Canaveral in November 2013 on an Atlas V rocket. The rocket burns about 280,000 kg of fuel over 4 minutes (you can assume dm/dt is constant over that interval)
asked on November 17, 2015 
consumer math
how many feet are there in 24 yards
asked on May 28, 2014 
Algebra 2
Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn!F(h) = x^29/x^24x+3
asked on April 3, 2014 
math
Find all pairs of numbers such that when they are added they equal 100, and when they are multiplied they are at least 2000.
asked on February 13, 2013 
math
By a unit fraction, we mean a rational number with a numerator of 1. Symbolically, 1 b where b is a nonzero integer. Find six distinct, positive unit fractions whose sum is 1.
asked on February 6, 2013 
math
50 red cars and 30 white and 20 blue what is the probability of 2 cars from the same colors ?
asked on January 16, 2013 
physics
does sunlight warm your body with light waves yes or no and why
asked on March 15, 2011 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
asked on December 2, 2010 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
asked on December 2, 2010 
5th grade
when crating an interval for a requncy tablehoe do you determine the interval number
asked on November 9, 2010 
math
to find the cordinates of the maximum or minimum point of a quadratic relationship?
asked on March 22, 2009 
biology
__Glycolysis is used to gain energy from glucose. How efficient is it (give an actual number) in its ability to get the energy from glucose into ATP? (assume the organism is undergoing anerobic fermentation). __You are studying a particular reaction in
asked on September 24, 2008 
math
the width of a rectangular painting is 2 meters less than the length, the area of the painting is 20 M^2
asked on February 26, 2017 
Health
Explain the relationship between hepatitis and virus?
asked on December 7, 2016 
Mathematics
How to use graphs to solve quadratic equations
asked on November 4, 2016 
physics
A marine siren consists of a cylinder 72 cm in length closed at one end.for sound through air at 336 m/s. find the lowest frequency of the siren
asked on June 4, 2016 
Calculus
Solve the differential equation: dy/dx = (3x^2) / (y+1) with initial conditions x = 1, y = 2 I have: ∫y + 1 dy = ∫3x^2 dx (y^2 / 2) + y = x^3 + C (2^2 / 2) + (2) = (1^3) + C? 4 = 1 + C 5 = c (y^2 / 2) + y = x^3 + 5 Is this correct?
asked on May 27, 2016 
PHYSICS
A 3.50 kg ball with a velocity of 10.00 m/s collides with a stationary ball with a mass of 5.00 kg. After the collision, the first ball travels at a 42.6 degree angle from its original path, while the second ball travels at a 26.7 degree angle from the
asked on March 27, 2016 
Calculus
1) A telephone company has 10,000 phones in a certain city where the basic rate is $4 per month. The officials have evidence that if the charge is reduced the number of phones will increase at an estimated rate of 1,000 phones for each 25 cent reduction.
asked on March 21, 2016 
Ã¡lgebra
What is the least perimeter of a rectangle with an area of 32 square feet?
asked on January 27, 2016 
math
Jennifer drove at steady speed for 2 hours then reduced speed by 10 mph and drove for another 3 hours what was the initial speed if the total distance was 220 miles?
asked on January 12, 2016 
math
2 over 5m14=9+3 over 5m
asked on September 17, 2015 
chemistry
how many milligrams of calcium is in 1.229g of calcium carbonate?
asked on December 4, 2014 
Algebra 2
Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn!@!@!. 49X^6+7X^7/28X^8
asked on March 28, 2014 
Algebra 2
d(x)= (54x^10)/(24x^8 )please help
asked on March 25, 2014 
algebra 2
Write in standard form (2b^2b)+(b^2+4b4) PLEASE EXPLAIN ON HOW TO DO IT I WANT TO LEARN
asked on February 10, 2014 
algebra 2
write in standard form. (2b^2b)+(b^2+4b4)
asked on February 10, 2014 
physics
What is the distance between an object and its real image formed by a thin converging lens with focal length f = 14 cm, if the object distance is 60 cm? (b) What is the minimum objectimage distance for a real image formed by that lens?
asked on November 7, 2013 
physics
If the water had lost 12000 joules and the calorimeter gained 1300 joules as the temperature of both rock and calorimeter increased from 22°C to 73°C and the mass of rock in the calorimeter was 189 grams, what is the specific heat, c, of the rock
asked on September 7, 2013 
Math ASAP
Base Area: 22 square inches Lateral Surface Area: 308 square inches What is the Surface Area of the hexagonal prism?
asked on August 24, 2013 
Math ASAP
Top Area: 26 square inches Top Perimeter: 34 inches Height: 11 inches What is the Surface Area of the 12sided prism?
asked on August 24, 2013 
Math ASAP
Top Area: 13 square inches Total Surface Area: 346 square inches What is the Lateral Surface Area of the 5sided prism?
asked on August 24, 2013 
Math ASAP
Base Area: 23 square inches Height: 11 inches What is the Volume of the hexagonal prism?
asked on August 24, 2013 
Math ASAP
Volume of Prisms: Volume: 150 cubic inches Top Area: 10 square inches What is the height? {5sided prism}
asked on August 20, 2013 
project
i need to write projec about travel guide to Libay ?
asked on May 11, 2013 
Science
What is mantenrep?
asked on December 2, 2012 
math
what is the answer to 5z1=?, 8s+4= etc. im thinking it is 5x3 (z=3)1 equals 14. am I right?
asked on May 29, 2012 
Algebra
Find the roots of the given equation by completing the square. αx^2 + βx + δ = 0
asked on February 27, 2012 
Algbera
solve for the roots of the quadratic equation 2(x^2  4x + 5)=x^2  x
asked on February 26, 2012 
algebra
Sam earns R1 350 per week doing tiling. How much does sam earn in an hour if he works 45 hours a week?
asked on February 1, 2012 
Precalculus
The problem is Find the difference quotient and simplify your answer F(x)=5x  x^2, F(5+h)  F(5) over h ^2 this means power of two
asked on August 15, 2011 
geometry
abcd is a rectangle such that ab=3 radical sign 48+2 radical sign 75+4radical sign108 and Bc=4 radical sign 27 +radical sign 300 prove that abcd is a square
asked on June 29, 2011 
algebra
7x=5+5x
asked on October 28, 2009 
algebra
what is (34576=657)+364*4567divided by 45637*234869=? use a calculator
asked on September 28, 2006

Math
c. supplies
posted on May 6, 2019 
math
hbjjbyuvtyiuyiuhjopiiuytrewqazxswedcvfrtgbnhyujmkiol,.;/;p['/']=[p0o9i87654321`12345678900==09876543wsxcvbnmklp9876
posted on May 22, 2018 
Science
2.0668
posted on February 11, 2018 
chem  precipitation problems
H2s + Pb(NO3)2 : 2HNO3 + PbS But i am not sure of the average rate , can you please tell me the answer?
posted on January 1, 2018