Tuesday
July 26, 2016

Posts by Rob

Total # Posts: 387

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 dont 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

physics
9.8
January 17, 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

4th grade math
Sixty-five hundredTHs is 0.65 (0.065 would be sixty-five thousandths).
January 13, 2009

rehabilitation
under what circumstances is it easy to turn your will and life over to the care of god
January 7, 2009

Algebra
I have to solve the following equation: x+y=9 xy=54 I changed the first equation to y=9-x to solve for y. I got x(9-x)=54 and then 9x-x^2=54. I then changed 9x-x^2= 54 to -x^2 +9x-54=0. I got stuck around here, can someone explain...
January 2, 2009

math
hi i was wondering how would you find the equation of a parabola with it's vertex at -2,0, and with no directrix or focus given. the parobala opens toward the left. the two choices in my multiple choice answer sheet that sound the most logical would be x+2=-1/8y^2 and x-2=...
November 29, 2008

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