Sunday

November 23, 2014

November 23, 2014

Total # Posts: 337

**Math**

Random variables X and Y are both normally distributed with mean 100 and standard deviation 4. It is known that random variable X+Y is also a normal distribution. a. What is the mean of X+Y? b. What is the standard deviation of X+Y? I see that the mean is 200 but I don't ...
*November 15, 2011*

**6th drade math**

There are 7oz of suger in a suger 16oz box of honey.What percent of honey is suger? Round to the nearest percent.
*November 2, 2011*

**physics**

because they are opssite forces acting on eachother
*October 31, 2011*

**Chemistry**

How much energy is associated with a photon in the gamma ray region of the spectrum with a frequency of 6.6*10^5s^-1
*October 31, 2011*

**Chemistry**

Calculate the frequency of a photon of orange light whose wavelength is 6.2*10^5m. (meters)
*October 31, 2011*

**Discrete Math**

A factory makes automobile parts, 5C7, 1O6 or 3Z0, which are of 5,000 parts, what is the minimum number of parts with the same serial number?
*October 27, 2011*

**chem**

energy of a proton divided by its frequency equals?
*October 23, 2011*

**math**

10 to the 9-9 power = ? How do you come to the answer =1?
*October 19, 2011*

**Science**

If earths mass were reduced by 1/2 , but its radious satyed the same , how much would your weight change ? Would it also be reduced by half ?
*October 17, 2011*

**general chem**

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution. (b) How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliters of 6.1 M HCl solution are needed to obtain 0.100 mol ...
*October 9, 2011*

**general chem**

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution. (b) How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliters of 6.1 M HCl solution are needed to obtain 0.100 mol ...
*October 9, 2011*

**general chem**

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write NR. (a) Nickel metal is added to a solution of copper (II) nitrate; (b) a solution of zinc nitrate is added to a solution of magnesium ...
*October 9, 2011*

**general chem**

THank YOu Dr.BoB222
*October 9, 2011*

**general chem**

Determine the oxidation number for the indicated element in each of the following compounds: (a) Co in LiCoO2, (b) Al in NaAlH4, (c) C in CH3OH (methanol), (d) N in GaN, (e) Cl in HClO2, (f) Cr in BaCrO4.
*October 9, 2011*

**algebra**

how far can you simplify7(3-6y)
*September 29, 2011*

**physics**

A ball launched from ground level lands 3 s later on a level field 48 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ignore any effects due to air resistance.)
*September 28, 2011*

**science**

a car exerts tractive force, calculate the force available for acceleration
*September 25, 2011*

**Genetics**

1) A White eye (w) female Drosophila is crossed with diminutive (dm) males. The F1 wild type females are then crossed to the double mutant, white eye, diminutive males and produce the following: white eye, normal size 487 normal eye, diminutive 475 normal eye, normal size 19 ...
*September 20, 2011*

**Pen Foster**

drama exam
*August 12, 2011*

**math**

find the eqt. of tangent to the curve y=-x^2+2x-10 @ the point where the curve cuts the y-axis.[ans:y=2x-10] how do i do this because they didnt give me the point...?
*July 22, 2011*

**math**

the tangent yo the curve y=x^2 +5x -2 @ the point (1,4)intersect the normal to the same curve @ the point (-3,-8) at the point P.Find the coordinates of point P.[ans: -1/3,-16/3] just give me some hint to calculate this solution.
*July 22, 2011*

**math**

in the question it say: at the point where the curve cuts the y-axis
*July 22, 2011*

**Math**

Express as a single term in simplest form: 5/2- radical 12
*May 30, 2011*

**physics**

if i crate is been dragged with 500 n of force with a 15 degree angle what would the horizontal force be?
*May 29, 2011*

**algebra**

Tina Mixes pretzels that sell for $2 a lb with cereal that sells for $3 a lb. she wants to make an 8 lb mixture to sell for $2.50. write 2 equations to represent this info. How many lbs of pretzels and how many lbs of cereal were used to make the 8 lb mixture?
*May 24, 2011*

**Science**

List advantages of the Bay of Fundy power plant
*May 17, 2011*

**English**

In the Kite Runner, why is the story about the sultans included? What is that story about?
*May 1, 2011*

**Physics**

Tom Brady passes a football – at a velocity of 50 ft/s at an angle of 40 degrees to the horizontal – toward an intended receiver 30 yd straight downfield. The pass is released 5 ft above the ground. Assume that the receiver is stationary, is isolated and that he can ...
*April 25, 2011*

**Physics**

put paper on block
*April 25, 2011*

**Physics**

You have a tiny slip of paper and a large rectangular wooden block. If you put both of them side-by-side and drop the two to the floor from the same height, the block gets to the floor first. Can you think of (and describe) three “simple” ways (using nothing, ...
*April 25, 2011*

**Physics**

You are driving your race car around a circular test track. Which would have a greater effect on the magnitude of your acceleration, doubling your speed or moving to a track with half the radius? Why?
*April 25, 2011*

**Physics**

An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?
*April 25, 2011*

**Physics**

f a water bed is 1.81 m on each vertical side and 30 cm high. Find its weight. The acceleration of gravity is 9.8 m/s2 and the density of water is 1000 kg/m3. Answer in units of N
*April 15, 2011*

**physics**

An acorn and tree leaf fall from the same height and time. Which reaches the ground first and why?
*April 9, 2011*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.
*April 4, 2011*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.
*April 4, 2011*

**Physics- 2D Collisions**

nitially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are actually...
*March 29, 2011*

**Physics**

A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the interaction with the ...
*March 28, 2011*

**Stats.**

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies ...
*March 28, 2011*

**Physics**

A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the interaction with the ...
*March 27, 2011*

**Math**

a plane flies due north at 300 mi/h for 3 h then due west at 250 mi/h. If x represents the number of hours the plane is flying due west, determine for what values of x the plane will be more than 3700 mi from it's original point.
*March 8, 2011*

**statistics**

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies are...
*March 7, 2011*

**statistics**

Part 1) A physical therapists wishes to determine whether an exercise program increases flexibility. He measures the flexibility (in inches) of 12 randomly selected subjects both before and after an intensive eight-week training program and obtains the following data: Before: ...
*March 7, 2011*

**Statistics**

Part 1) Exposure to dust at work can lead to lung disease later in life. In a study of 115 drill and blast workers involved in tunnel construction the mean dust exposure was 18.0 mg-yr/m^3 with a standard deviation of 7.8 mg-yr/m^3 (sample 1). Another study of 220 outdoor ...
*March 7, 2011*

**business ethics**

Ethics systems table
*March 6, 2011*

**ENG**

Know
*March 6, 2011*

**math**

If a hot dog vendor offers 18 different condiments; how many condiment combinations are there?
*March 6, 2011*

**Math**

3 pipes are used to fill apool with water .Individually they can fill that pool in 9hr ,6hr ,3hr .how many minutes will it take to fill the pool if all 3 pipes are used simultaneously?
*March 5, 2011*

**Math**

In NY the ratio of private homes to apartment is 3:5 . If all the apartments are brick made and 1/10 of the private homes are wooden what is the maximum portion of houses that may be brick made? a 15/16 b 5/8
*March 5, 2011*

**Machanics**

particles of mass 3m and 5 m hang one at each end of a light inextensible string which passes over a pulley.The system is released from rest with the hanging parts taunt and vertical.During the subsequent motion the resultant force exerted by the string on the pulley is of ...
*March 4, 2011*

**math**

particles of mass 3m and 5 m hang one at each end of a light inextensible string which passes over a pulley.The system is released from rest with the hanging parts taunt and vertical.During the subsequent motion the resultant force exerted by the string on the pulley is of ...
*March 4, 2011*

**Math**

particles of mass 3m and 5 m hang one at each end of a light inextensible string which passes over a pulley.The system is released from rest with the hanging parts taunt and vertical.During the subsequent motion the resultant force exerted by the string on the pulley is of ...
*March 3, 2011*

**trigonometry**

if the three sides of a triangle is 4,5,6 then the cosine of the angle between the sides 4 and 5 is
*March 3, 2011*

**Math **

if 20 feet pole casts 4 feet shadow then 6 feet man will cast a shadow of ((4*6)/20)= 1.2feet
*March 3, 2011*

**Math **

4*6/20=1.2 feet
*March 3, 2011*

**accounting **

did these questions ever get answered
*February 27, 2011*

**Chemistry**

Copper (II) fluoride contains 37.42% F by mass. Use this percentage to calculate the mass of fluorine in grams contained in 24.0 g of copper (II) fluoride.
*February 27, 2011*

**chemistry**

trust me im a doctor. we can make some chemistry
*February 2, 2011*

**chemistry**

AT 40 DEGREES HOW MUCH POTASSIUM CHLORIDE CAN BE DISSOLVED IN 300G OF WATER
*January 20, 2011*

**physics**

baseball thrown horizontally takes 1.1 seconds to reach the ground. What is the height at which the ball was thrown?
*January 11, 2011*

**physics**

baseball thrown horizontally takes 1.1 seconds to reach the ground. What is the height at which the ball was thrown?
*January 11, 2011*

**physics**

on a planet whose mass is twice that of earth and whose radius is same, with what acceleration will a body fall at sea level?
*January 10, 2011*

**physics**

what is tangential velocity of the earth as it travels in its orbit around the sun?
*January 10, 2011*

**calculus**

Try this way: Perimeter = 2x+2 therefore P = 2x + 2/x^2 d(perimeter)/dx = (2x^3-4)/x^3 solving for x = 2^(1/3) therefor y was given as y = x^-2 plug x into y to solve for y. y = 2^(-2/3) or y = (1/4)^(1/3) check the answer it should be 3.78
*December 13, 2010*

**Math**

factor completely 3y^3 - 12y
*November 26, 2010*

**Microeconomics**

Pharmaceutical drugs have an inelastic demand, and computers have an elastic demand. Suppose that technological advance doubles the supply of both products (that is, the quantity supplied at each price is twice what it was).
*November 22, 2010*

**Microeconomics (full version)**

Pharmaceutical drugs have an inelastic demand, and computers have an elastic demand. Suppose that technological advance doubles the supply of both products (that is, the quantity supplied at each price is twice what it was). a. What happens to the equilibrium price and ...
*November 22, 2010*

**Microeconomics**

Pharmaceutical drugs have an inelastic demand, and computers have an elastic demand. Suppose that technological advance doubles the supply of both products (that is, the quantity supplied at each price is twice what it was).
*November 22, 2010*

**Algebra**

A gardener has 60 feet of fencing with which to enclose a garden adjacent to a long existing wall. The gardener will use the wall for one side and the available fencing for the remaining three sides. (a) If the sides perpendicular to the wall have length x feet, which of the ...
*November 21, 2010*

**Algebra**

If the sides perpendicular to the wall have length x feet, which of the following (A, B, C, or D) represents the area A of the garden? A(x) = –2x2 + 30x A(x) = –2x2 + 60x A(x) = x2 – 60x A(x) = 2x2 – 60x
*November 21, 2010*

**physics**

a small child is sliding down a 25 degree slide at a uniform velocity of 1.0 m/s. If the child weighs 210 N, find the coefficient of friction between the slide and the child.
*November 18, 2010*

**Trig**

What expression represents the same value as sin 19(degrees)?
*November 11, 2010*

**Chemistry**

When heated, N2O4 dissociates as follows: N2O4 =2NO2 A flask initially contians .560 M N2O4. at this temperature, Kc is 4.00. what is the equilibrium concentration of NO2?
*November 4, 2010*

**physics**

A 0.69 kg mass is observed to accelerate at 8.16 m/s2 in a direction 30.5° north of east. There is a force directed north acting on the object and a force directed east acting on the object. What is the magnitude of the force acting east on the object?
*November 3, 2010*

**physics**

A 0.69 kg mass is observed to accelerate at 8.16 m/s2 in a direction 30.5° north of east. There is a force directed north acting on the object and a force directed east acting on the object. What is the magnitude of the force acting east on the object?
*November 3, 2010*

**physics**

A 0.69 kg mass is observed to accelerate at 8.16 m/s2 in a direction 30.5° north of east. There is a force directed north acting on the object and a force directed east acting on the object. What is the magnitude of the force acting east on the object?
*November 3, 2010*

**physicssss**

A 0.69 kg mass is observed to accelerate at 8.16 m/s2 in a direction 30.5° north of east. There is a force directed north acting on the object and a force directed east acting on the object. What is the magnitude of the force acting east on the object?
*November 3, 2010*

**PHYSICAL SCIENCE**

KE=1/2mXv KE=1/2(5kgX10m/s^2) KE=1/2(5kgX100m/s^2) KE=1/2(500kgXm/s^2) KE=250kgXm/s^2=250J
*November 2, 2010*

**Math**

Latoya has 3/4 of a bag of popcorn. If she eats half of the popcorn at a movie, ho much does she have left?
*November 1, 2010*

**Math**

If Rupert flew 3/16 of the way around the world but George only flew 4/9 as far as Rupert, how far around the world did George fly?
*November 1, 2010*

**physics**

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h?
*October 31, 2010*

**physics**

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h?
*October 31, 2010*

**Physics**

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h?
*October 31, 2010*

**corporate finance**

Bank One is offering a 30yr mortgage with an EAR of 5 3/8%. You plan to borrow $150,000, what will your monthly payments be
*October 20, 2010*

**corporate finance**

If the rate of inflation is 5%, what nominal interest rate is necessary for you to earn a 3% real interest rate on your investment?
*October 19, 2010*

**physics**

A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. The small wheel has a radius of 1.7 cm and accelerates at the rate of 6.9 rad/s^2, and it is in contact with the pottery wheel (radius 27.0 cm) without ...
*October 18, 2010*

**gen chem**

what is the concentration of an aqueous solution when you add 9.58x10^-4 moles of copper nitrate to 42ml of water
*October 17, 2010*

**Business**

Communist Prison Camp In such prisons the total regimen, consisting of physical privation, prolonged interrogation total isolation from former relationships and sources of information, detailed regimentation of all daily activities, and deliberate humiliation and degradation, ...
*October 15, 2010*

**grammar**

in the sentence "He felt hungry and thought about the lunch wrapped in his handkerchief." which are the linking verbs and which are the action verbs?
*October 12, 2010*

**algebra**

the acme widget company has $13,000 available for making widgets. part of the money is spent on an advanced widget-bending machine costing $1,000. the manufacturing cost for each widget is $3. how many widgets can be made with the money available?
*October 9, 2010*

**physics**

how long would it take for the car to go from 0 to 4mi/h
*October 1, 2010*

**applied maths**

a force 'P' acts on a bodyat an angle theta to a horizontal line 'OX'. P,together with a pull of 1.5kn at 30degrees to, and below 'OX', has the same effect as a force of 5kn at 45degrees to and above 'OX'. i'm so confused!
*September 19, 2010*

**english**

. In the following sentence, the comma is used correctly with an introductory clause: “Training for the upcoming ten-mile marathon, Lizette includes more protein and complex carbohydrates in her diet.” True False
*September 19, 2010*

**geometry**

Given Circle D, if AC = 16 units, then what is the length of CB? A circle is drawn with center D. Two radii are drawn, AD and DC. Segment AC is drawn with a perpendicular, DB.
*August 31, 2010*

**Chem**

Why does the reaction of (Z)-butenedioic acid (fumaric acid) with 1,3-cyclopentadiene give only one product? I don't know where to start. Thanks.
*August 23, 2010*

**PSYCHOLOGY**

5. a
*July 17, 2010*

**algebra**

find the domain of the function p(x) = x^2 - 2x + 10
*July 8, 2010*

**chemistry**

Why do you need to use amount in moles to solve stoichiometry problems? Why can’t you just convert from mass to mass?
*June 2, 2010*

**chemistry**

The equation for burning C2H2 is 2C2H2(g) + 5O2(g) ⎯→ 4CO2(g) + 2H2O(g) a. If 15.9 L C2H2 react at STP, how many moles of CO2 are produced? (Hint: At STP, 1 mol = 22.41 L for any gas.) b. How many milliliters of CO2 (density = 1.977 g/L) can be made when 59.3 mL O2...
*June 2, 2010*

**geometry**

B is the midpoint of Symbol for segment AC. AB=3x-6 BC=2x+2 What is the value of AB? Show your work for credit.
*May 9, 2010*

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