Posts by Ed

Total # Posts: 278

math
2 airplanes start at the same time from airports 500 km apart. Each flies with an airspeed of 200 km/hr toward the other airport. One reaches its airport half an hour before the other plane reaches the other airport. How fast is the wind blowing?

Chemistry
I have the same question in my homework. Anybody know how to do this?

physics
A football kicker lines up to kick a game winning kick. The goalpost is 30m away and the ball must clear the 3.3m high cross-bar. If the kick leaves his foot at an angle of 35 degrees, how fast must the kick be to clear the bar?

physics
At a circus, a human cannonball is shot from a cannon at 15m/s at an angle of 40 degrees from horizontal. She leaves the cannon 1m off the ground and lands on the way down in a net 2m off the ground. Determine her horizontal displacement.

Calculus
Two forces of equal magnitude act to 60 degrees. If their resultant has a magnitude of 30N, find the magnitude of the equal forces.

Statistics
A box contains four balls labeled 1,2,3,4 respectively. Two balls will be sequentially selected from the box at random without replacement. Let Y1 be the maximum of two outcomes and Y2 be the minimum of two outcomes observed. Find the joint probability function of Y1 and Y2.

physical science
A stone is dropped from rest at the top of a tall building. Determine the distance the ball has traveled after ½ second, one second, 3/2 seconds, and 2 seconds. How fast is the ball moving at the end of the 2 seconds?

physics
A room has the dimensions 3.0 m by 4.0 m by 4.0 m . The air in the room is 79% N2( MW= 28) and 21% O2 (MW = 32). At a temperature of 20 degrees Celsius and pressure of 115 kPa , what is the mass of the air in the room in kilograms?

physics
Starting at rest at the edge of a swimming pool, a 72.0-kg athlete swims along the surface of the water and reaches a speed of 1.15 m/s by doing the work Wnc1 = +170 J. Find the nonconservative work, Wnc2 done by the water on the athlete.

Chemistry
Electrons in the outermost principal shell of an atom that are involved in chemical bonding are referred to as:

Math
Find the integral of (3x-2)4^x dx

Calc
definite integral from 0 to 1 of 5xln(x+1)dx

Physics
A Silver bowl has a mass of 1.78kg. It is shaped like a cylinder and has a diameter of 35.0 cm and a height of 8.00cm. It is placed in water. Find (a)the volume of water it displaces, (b) The buoyant force exerted on it by the water, and(c)how deeply it sinks into the water.

collefge
At what volume of added acid is the ph calculated

physics
The earth orbits the sun once every 365.24 days. The distance between the earth and sun is 1.49x 10^8 Km. The mass of the earth is 5.96 x 10 ^24 kg. A) Find the magnitude in newtons of the centripetal force acting on the earth. The mass of mars is 6.56 x 10 ^23 Kg and the ...

PHYSICS
a 50 kg person running to the east at 8.5 m/s jumps into a 100 kg initially at rest. A)find the velocity of the wagon and person together as they move away.B) If they coast 30 m before coming to a stop, find the average force of the friction that slows them down.

algebra
Suppose a retiree wants to buy an ordinary annuity that pays her $2,000 per month for 20 years. If the annuity earns interest at 3.5% interest compounded monthly, what is the present value of this annuity?

Calc
ex: Find the indicated derivative using implicit differentiation. e^x/y^2= 8 + e^y; dy/dx Please I need help and thank you very much!

Calculus
She found the derivative of the equation, and then simply plugged in a one for the (x) after it was in its derivative form.

physics
A person jumps off a diving board 4.3 above the water's surface into a deep pool. The person's downward motion stops 2.1 below the surface of the water.

Math
Find c, so that f(x) is everywhere continuous? f(x)= {x+c, x <_2 2x^2 -5, x > 2

Chemistry
115?

Physics
Acceleration due to gravity is 9.81 m/s/s. What is the weight (in Newtons) of a 97.96 kg mass?

physics
A net force of 265 N will accelerate how much mass at 0.5 m/s/s?

Economics
which of the following factors will not lead to a decrease in demand for a good? A) an increase in the price B) a decrease in the price of substitute products C) An unsuccessful advertising campaign for the good C) a decrease in the consumer incomes I think it is B, but the ...

Government
What is an executive privilege?

Government
What is the difference between an executive agreement and treaties?

Government
no i do not

Government
Authority possessed by both the state and national government that may be exercised separately and simultaneously are called________ powers. These powers may not be exclusively within the scope of the national power or in conflict with the national law. What word goes in the ...

Government
Im confused, u said right but did not answer the question??

Government
Authority possessed by both the state and national government that may be exercised separately and simultaneously are called...... powers. These powers may not be exclusively within the scope of the national power or in conflict with the national law.

Economics
Does the demand-pull theory represent a leakage or injection in the economy? I'm confused.

Math
What is the probability oi rolling a total of 7 in two rolls of a standard die if you get an even number of the first roll? Could someone please help me? Thanks

Chemistry
What is the [H+] of a 0.1 M malonic acid with a Ka of 10^-9 solution? I thought it was just (Ka x Ca)^(0.5), but that doesn't get me a pH of 5.

Math
A die is rolled twice. What is the probability that the sum of the rolls is less than 4 given that one of the rolls is a 1? The answer is 3/11. Could someone tell me how to get this. Thanks?

chemistry
How much hydrogen gas (H2) forms when 54 g of aluminum reacts with excess HCI ?

chemistry
What is the molarity (mol/L) of sodium (Na) in a solution containing 0.4 mole ofNa + cation in 400 mL of an aqueous (water) solution?

chemistry
number of moles in CL- 1.75 L of 1.0*10 -3M ZnCl

physics
Hey Bob, I think you need to check your algebra. As the student substituted 2 posts up vmin is bigger than vmax.

physics
The book gives an answer for part a below. v = sqrt (rg*cos theta*sin theta) I assume that's incorrect?

math
my son has to draw a figure with an area of 63 and a perimeter of 32.how do he go about doing it?

spanush
what is the verb poner in the preterite "yo" form?

Math
What is the root of 22 over the root of 32?

math
a rectangle has length which is twice the width. if the diagonal is the 5 times the square root of 5 meters long, find the perimeter of the rectangle.

physics
Two friends are sitting in a stationary canoe. At the person at the front tosses a sack to theperson in the rear, who catches the sack 2 later. Which plot in the figure shows thevelocity of the boat as a function of time? Positive velocity isforward, negative velocity is ...

Economics
Are chickens and and cows examples of capital goods? Capital goods are items used in the creation of other goods. Because chickens create eggs and cows make milk, are they consumer goods?

Chemistry
If calcium carbonate) and aluminum silicate are mixed together and heated then the result is cement. Cement is a mixture of calcium oxide, carbon dioxide, aluminum oxide, and calcium silicate. Write the balanced equation for this reaction. My Answer: CaCO3+Al2(SiO3)3 -> CaO...

Math
Using the binomial theorem, Find the first three terms in the expansion of (x-(1/x))^5. My solution: C(5,0)x5 + C(5,1)(x4)(-1/x) + C(5,2)(x3)(-1/x)2 x5 + (5)(x4)(-1/x) + 10(x3)(-1/x)2 x5 + (-5x4/x) + 10(x3)(1/x2) x5 + (-5x3) + 10(x) x5 -5x3 + 10x The first three terms are x5...

Math
Using the binomial theorem, Find the first three terms in the expansion of (x-(1/x))^5. My solution: C(5,0)x5 + C(5,1)(x4)(-1/x) + C(5,2)(x3)(-1/x)2 x5 + (5)(x4)(-1/x) + 10(x3)(-1/x)2 x5 + (-5x4/x) + 10(x3)(1/x2) x5 + (-5x3) + 10(x) x5 -5x3 + 10x The first three terms are x5...

Phyiosics
Three point charges lie in a straight line along the y-axis. A charge of q1 = -9.50 µC is at y = 6.30 m, and a charge of q2 = -7.20 µC is at y = -4.00 m. The net electric force on the third point charge is zero. Where is this charge located? y = m

math year 3
identify the vertex and axis of symmetry y=2x^2-28x+91

Statistics
Given a population with a normal distribution, a mean of 100, and a standard deviation of 1, what value has an area of .1234 to its right?

statistics
E=CV(SD/square root of n) E=1.96(70/square root of 20) E=6.86 mean-e<mean<mean+e 350 - 6.86 < 350 < 350 + 6.86 343.14 < mean < 356.86 I think that is right

chemistry
e).2

Physics
What minimum coefficient of friction between the tires and the road will allow a 3700 kg truck to navigate an unbanked curve of radius 25 m at a speed of 45 km/h? My answer: Fnet=ma Ff=m(v2)/r) Ff=(3700)(452/25) Ff=(3700)(2025/25) Ff=(3700)(81) Ff=299700 Frictional force Ff=Fn...

chemistry
How many moles of solute are contained in a 150ml solution of a 0.25 M NaNO3 solution?

history
Heather bought a ten-year maturity corporate bond when it was issued for $1,000. The bond has an annual interest rate of seven percent and pays interest semi-annually. How much does she receive every six months?

math
3x + 4 = 5x - 7

Physics
In an accidental explosion, a satellite breaks in half while in circular orbit about earth. One half is brought momentarily to rest. What is the fate of the half brought to rest? What happens to the other half?

physics
A skier of mass 75.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60.0 m up a 35° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

physics
A 89.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the grocery cart's final speed?

ITT
In an accidental explosion, a satellite breaks in half while in circular orbit about earth. one half is brought momentarily to rest. what is the fate of the half brought to rest? what happens to the other half?

Managerial Econmics
Q4: Ch 5 (10%) In terms of the consumer theory set forth in this chapter, can you explain the meaning of the following statements? a. “I think you get more for your money from Nike than from Reebok.” b. “I wanted to buy a Boxster rather than a Malibu, but it ...

Math
Find the quotient function f/g for f(x)=sqr(x+1) and g(x)= sqr( x-1). My Answer: sqr(x+1)/sqr( x-1) sqr(x^2-1)/ (x-1) However, I also have to state the restrictions to the domain and range, which I do not know how to do. Could someone please help me? Thanks.

Math
Find the quotient function f/g for f(x)=sqr(x+1) and g(x)= sqr( x-1). My Answer: sqr(x+1)/sqr( x-1) sqr(x^2-1)/ (x-1) However, I also have to state the restrictions to the domain and range, which I do not know how to do. Could someone please help me? Thanks.

physics
1.17

Math
Thanks!

Math
Find the value of the following. 10^(-10log3) The log exponent is confusing me. Could someone please help me? Thanks.

Math
Find the value of the following. 10^(-10log3) The log exponent is confusing me. Could someone please help me? Thanks.

math
1.binomial 2.degree of monomial 3.monomial 4.perfect-square trinomial 5.standard form of polynomial A.a polynomial with two terms B.a polynomial in which the terms decrease in degree from left to right and there are no like terms C.a polynomial whith two identical binomal ...

math
answer for (y+4)(5y-8)

Accounting
If the owner of a business invests personal funds into the business, will it be a credit to his drawings? For example,if the owner had drawings of $5000 and then he invested $2000 of his personal funds into the business, would the drawings account then be $3000? Thanks.

Accounting
If the owner of a business invests personal funds into the business, will it be a credit to his drawings? For example,if the owner had drawings of $5000 and then he invested $2000 of his personal funds into the business, would the drawings account then be $3000? Thanks.

geometry
find x 40x+50=150

math
Here is the question I have to answer. Find the area of the specified figure. Show how you can use the formula for area to find the answer. I know you can't see the graph but can you direct me in the right direction of solving these. I don't know if there a formula you...

algebra
The function H described by H(x) =2.75x+71.48 can be used to predict the height, in centimeters, of a woman whose humerus (the bone from elbow to the shoulder) is x cm long. Predict the height of a woman whose humerus is 32 cm long.

algebra
i need 2007, 2008 and what will for 11,160 gun deaths

algebra
The equation y =-1777+27,153 can be used to predict the number y of gun deaths in the United States x years after 2000, that is, x=0 corresponds to 2000, x=2 corresponds to 2002, X=6 corresponds to 2006, and so. Predict the number of gun deaths in 2006 and 2007. In what year ...

algebra
On three consecutive passes, a football team gains 6 yards, loses 36 yards, and gains 16 yards. What number represents the total net yardage?

algebra
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 Miles per hour and train B is traveling at 88 miles per hour. Train A passes a station at 1:20 am A.M. If train B passes the same station at 1:35 A.M., at what time will train B ...

math
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 Miles per hour and train B is traveling at 88 miles per hour. Train A passes a station at 1:20 am A.M. If train B passes the same station at 1:35 A.M., at what time will train B ...

college
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 Miles per hour and train B is traveling at 88 miles per hour. Train A passes a station at 1:20 am A.M. If train B passes the same station at 1:35 A.M., at what time will train B ...

college
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 Miles per hour and train B is traveling at 88 miles per hour. Train A passes a station at 1:20 am A.M. If train B passes the same station at 1:35 A.M., at what time will train B ...

math
Ed, Ethan and Nathan are playing a game. Ed has won11 rounds, Ethan has won 8 rounds, and Nathan has won 1 round. Write the relative frequency of Ed not winning a round as a percent. 45%? Is my Answer correct?

systems word problems
the sum of two numbers is 11. their product is 30. find the numbers. answer 5,6 represent the unknown by variables using let statements, translate into equationsusing variables. combine hem using substitution or elimination. answer the question by solvingand substituting state...

math
us proportions, then cross multiply: 5/7 = 14/x 5*x = 7*14 5x = 98 5x/5 = 98/5 x = 19.6 inches in length

math
I have three packages whose total weight is 60 kg. If the two heaviest packages weigh 50 kg together, and the two lightest weigh 25 kg together, what is the weight, in kg, of the heaviest package?

Math
What is the FCIA tax (assuming a 7.05% rate) on a weekly paycheck of $398.00? What is the sales tax of 5% on a purchase of $6.71? What is the property tax of 1.6% on property assessed at $60,000? Please help i am very stuck on these!!!!

Bible Fill In The Blank
1. God can use suffering to cause us to ? spiritually and to bring ? to Himself. I Think the first one is "grow". I'm not sure about the other one. I'm Not Sure For Numbers 2-4 (Below). Please Help Me! 2. Ethical, doctrinal, numerical, and factual variances ...

Chem
Write a balanced equation for the following reduction-oxidation reaction. SO3–2 + MnO4–SO42– + Mn2+ __SO32–(aq) + ___MnO4–(aq) + ___H+(aq)--> ___SO42–(aq) + ___Mn2+(aq) + ___H2O(l) I have no idea how to do this type of problem, care to explain?

History
after reading that i am leaning more towards number 2?

History
Washington's main objective as president of the united states was to: (1) set up a court similar to that of Eurpoean monarchs. (2) establish respect for the office of presidency. (3) keep peace between the northern and southern states. (4) maintain his power and get ...

AP Government
E is definitely not correct.

math
f"(x)=2, f'(2)=5, f(2)=10. solve this differential equation by finding the particular solution. How do you do this?

american lit. [[10th grade]]
idk if it'll help, but try googling spark notes. they usually have some sort of background info on the main characters of the book.

Math
it is a linear equation because there is only one exponent.

Physics
I don't know where to start off.

Physics
A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (Hint: Remember...

Physics
A race car starts from rest on a circular track of radius 507 m. The car's speed increases at the constant rate of 0.790 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following. (a) the speed of the race car ...

Physics
Thank you for helping! got the answer correct (:

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