# Posts by Rob

Total # Posts: 391

**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*

**AP Biology**

instinctive learning

*August 1, 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*

**Chemistry**

Hello, I'm wondering what the difference is in method when it comes to finding the pH of a weak acid versus finding the pH of a strong acid? Thanks!

*April 26, 2010*

**Physics**

I lov science

*April 26, 2010*

**chemistry**

what is the molarity of a 50% by mass solution of NaOH id the density of the solution is 1.05 g/ml

*April 19, 2010*

**economics**

Why would flat panel TV prices drop over time?

*March 28, 2010*

**Can anyone help me with a physics question?**

A water tank has a volume of 100m^3. A square pipe leading to a pump is designed to completely replace all water in 20 minutes. Caluclate the length of a side of the square if the water is travelling at 5.0m/s through the square pipe.

*March 16, 2010*

**Computer Science**

Using the operations push(E obj), peek(), pop(), empty() give a Java implementation of the method // Reverses the elements in the stack //and returns the result. // The stack passed as an argument to //reverse() will be // destroyed upon return. public static StackInt reverse...

*March 11, 2010*

**calculus**

This limit represents the derivative of some function f at some number a. Select an appropriate f and a. 1f(x) = x4, a = 4 f(x) = x1/4, a = 4 f(x) = x1/4, a = 256 f(x) = ãx, a = 256 f(x) = ãx, a = 16

*February 24, 2010*

**calculus**

plzzz help!!!

*February 24, 2010*

**calculus**

A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and speed when t = 9. f(t) = t ^-1 - t

*February 24, 2010*

**calculus**

Consider the function below. g(x) = 2 - x^3 (a) Find g'(0). (b) Use it to find an equation of the tangent line to the curve y = 2 - x^3 at the point (0,2).

*February 24, 2010*

**College Physics**

1/2 P(intitial)

*February 8, 2010*

**trig**

find the exact value of cos(theta) if the terminal side of angle(theta) contains the point (-3,5)

*January 31, 2010*

**8th grade**

a rabbit can climb one or two steps at a time on a ten step staircase, but he never goes back down. In how many different ways can the rabbit climb a flight of ten steps

*January 26, 2010*

**Trigonometry**

A little boy is flying a kite. The string of the kite makes an angle of 30 dgrees with the ground. If the height of the kite is h equals 15 m, find the length (in meters)of the string that the boy has used.

*January 24, 2010*

**Trigonometry**

i don't know..i just need help.

*January 24, 2010*

**Trigonometry**

A pole with a height of 60 ft. has a shadow of length of 34.64 ft at a particular instant of time. Find the angle of elevation of the sun at this point of time.

*January 24, 2010*

**american government**

what two actions could congress take to undo a supreme court ruling that a federal law is unconstitutional? explain the advantages and disadvantages of each action?

*January 21, 2010*

**AMERICAN GOVERNMENT**

EXPLAIN PRESIDENTIAL SUCCESSION STEPS.

*January 19, 2010*

**AMERICAN GOVERNMENT**

THREE CONSTITUTIONAL REQUIREMENTS TO BECOME PRESIDENT OF THE U.S.?

*January 19, 2010*

**AMERICAN GOVERNMENT**

LIST 6 MAJOR ROLES OF THE PRESIDENT?

*January 19, 2010*

**AMERICAN GOVERNMENT**

LIST FOUR FACTORS AFFECTING VOTER TURNOUT?

*January 19, 2010*

**american government**

LIST FOUR FACTORS AFFECTING VOTER TURNOUT?

*January 13, 2010*

**Chem answer check**

Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What determines the polarity ...

*November 24, 2009*

**Algebra**

factor the expression csquared + 10c + 25

*November 9, 2009*

**Algebra**

csquared + 10c + 25 factor the expression...

*November 9, 2009*

**Programming**

Here is the source code for the Kitty class: public class Kitty { String name; int age; public Kitty(){ } public void setName(String n){ name = n; } public String getName(){ return name; } public void setAge(int a){ age = a; } public int getAge(){ return age; } } 1) The array ...

*October 28, 2009*

**physics**

Sorry i see the mistake I made for m the acceleration would be negative since its moving down

*October 10, 2009*

**physics**

from the FBDs wouldnt u get for M: Fy = N-WM=Ma Fx=T=Ma for m: Fy= T-Wm=ma Fx= T-W=ma then solve for a in M of Fx and sub a into m of Fx to get T?

*October 10, 2009*

**Geometry**

I need to invest on that calculator thanks Kerri

*September 10, 2009*

**Geometry**

that explains it better thanks Reiny

*September 10, 2009*

**Geometry**

what is the formula or how did you get that answer?

*September 10, 2009*

**Geometry**

The sides of a square each measures 4 ¾ inches. Find the area of the square as a fraction or mix number. (Do not use decimals)

*September 10, 2009*

**Grammar**

Are the following sentences punctuated correctly? Although, there is no definite evidence of malignancy, a biopsy should still be performed. He is incidentally, allergic to contrast material. Surgery, is not in my opinion indicated at this time.

*July 18, 2009*

**Grammar**

Are the following sentences punctuated correctly? The lung exam showed no rales, rhonchi or wheezes. She has a history of cough, not productive, that keeps her awake at night. The patient is a well-developed, well-nourished, badly sunburned cantankerous white male.

*July 18, 2009*

**science**

because it has a lot of gas in it??

*June 6, 2009*

**science**

which of the following is formed from molten rock that contains large amounts of gasses?? A: Rhyolite B: granite C:basalt D: pumice

*June 6, 2009*

**Algebra**

How do I do radical 7/10... my answer was 4 radical 3 over 6... is that correct?

*May 10, 2009*

**MATH**

24 pages

*May 10, 2009*

**College Chemistry**

[H30+] = 10^-(pH goes here) A log is an exponent. Since pH is a negative log, it's an exponent with a negative sign on it (with an implied base of 10).

*April 26, 2009*

**Econ**

In which of the following circumstances would a buyer be indifferent about buying a good? a. The amount of consumer surplus the buyer would experience as a result of buying the good is zero. b. The price of the good is equal to the buyer's willingness to pay for the good. ...

*March 30, 2009*

**Econ**

A result of welfare economics is that the equilibrium price of a product is considered to be the best price because it a. maximizes total revenue for firms and maximizes the quantity supplied of the product. b. maximizes the combined welfare of buyers and sellers. c. minimizes...

*March 30, 2009*

**science**

what do the tropic of capricon, tropic of cancer lines, artic, an antartic circles represent?

*March 26, 2009*

**science**

how were the latitudes of the tropic of cancer, tropic of capricorn, Arctic circle, and Antarctic circle determined?

*March 26, 2009*

**science**

heyy my friend rob needs help can u help him too?

*March 26, 2009*

**math**

Given: They collected 49 + 72 + 108 + 121 = 350 lbs of cans. So, the KNOWN part of the question is, “These folks collected 350 lbs of cans.” Answer: 10 I say the answer, 10, is really, “10 cents per pound.” Therefore, the UNKNOWN part of the question is, &#...

*March 17, 2009*