Thursday
November 27, 2014

Posts by ann


Total # Posts: 1,256

math
a vertical flagpole casts a shadow of 12ft long at the same time that a nearby vertical past 8ft casts a shadow 3ft long. Find the height of the pole
November 22, 2014

Science Help
If your question is which one is renewable, then it is corn.
November 21, 2014

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians. What is the angular acceleration of the wheel? What is the angular velocity when the time t = 8.7 s? I got the answer...
November 21, 2014

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians. What is the angular acceleration of the wheel? What is the angular velocity when the time t = 8.7 s? I got the answer...
November 21, 2014

Physics
α = 1.00 rad/s2
November 21, 2014

Physics
An iron disk has a radius of 0.625 m and a mass of 217 kg. The disk is mounted on its axis so that it is free to spin. How much force is required if the force is applied at a distance 19.5 cm from the axis of rotation?
November 21, 2014

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7 s have elapsed, it has rotated through an angle of 20 radians. I found that the angular velocity at 8.7 s is 4.60 rad/s. What is the angular acceleration of the wheel? What is the...
November 21, 2014

Physics
A clock has a second hand whose tip rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the second hand is 0.0020 N and the length of the hand is 9.5 cm, what is the minimum torque that must be applied to the second hand ...
November 21, 2014

Physics
A 30-caliber rifle with a mass of 3.54 kg fires a 7.33- g bullet with a speed of 596 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer)
November 21, 2014

Physics
A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
November 21, 2014

Physics
A 30-caliber rifle with a mass of 3.54 kg fires a 7.33- g bullet with a speed of 596 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer)
November 20, 2014

Physics
A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
November 20, 2014

College Algebra
graph linear equation Y=1/2x-3 and -x+2y=-6
November 11, 2014

Physics test review
A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
November 8, 2014

statistics
Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information that you have. Your boss has asked you to put together a report showing the relationship between these two variables. What could you ...
November 5, 2014

Technology for Biobased Products
QA.A bio-PDO production process will also produce microbial biomass. A huge surplus biomass of roughly 10% of the PDO mass should be expected. A good use of this microbial biomass could be food of feed. Which organism properties disqualify their use in food/feed production ...
November 4, 2014

math
the windshield on an automobile is inclined 42.5 degrees with respect to the horizontal. assuming that the windshield is flat and rectangular, what is its area if it is 1.50m wide and the bottom is 0.48m in front of the top?
November 3, 2014

algebra
Write a word problem about collecting: 5 + 6x = 21 + 4x
October 30, 2014

algebra
Julie and two friends babysat for 5 hours yesterday. They divided their total earnings equally. Julie spent $8 from her part of the money and had $11 left. What was the total amount the three friends earned?
October 30, 2014

physics
John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?
October 29, 2014

Dudas
John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?
October 29, 2014

thermochemical equation:
Given the following thermochemical equation: NO2 (g) + O2 (g) → NO (g) + O3 (g) ΔH = - 212 kJ Which has more enthalpy, the reactants NO2 (g) + O2 (g), or the products NO(g) + O3 (g) ? The reactants have more enthalpy. The products have more enthalpy. The reactants ...
October 29, 2014

math
Identify the solution of the system of equations if any -2x-4y=1 , 12y=-6x-3 is this no solution or (o,-1) (-1,0) or infinitelt many solution
October 28, 2014

physics
A toy car in the figure below runs off the edge of a table that is h = 1.150 m high. The car lands d = 0.410 m from the base of the table.
October 27, 2014

physics
what are the dimensions of power?
October 15, 2014

Physic
A 1/2 inch diameter piston moves 10 inches when 30 Lbs of force is applied how far will it move a 6 inch diamter piston and how much weight will this piston lift.
October 13, 2014

Physics
A highway curve with a radius of 800 m is banked properly for a car traveling 100 km/h. If a 1620- kg Porshe 928S rounds the curve at 220 km/h, how much sideways force must the tires exert against the road if the car does not skid?
October 6, 2014

Physics
During 0.19 s, a wheel rotates through an angle of 2.42 rad as a point on the periphery of the wheel moves with a constant speed of 2.88 m/s. What is the radius of the wheel?
October 6, 2014

math
Max had 4/5 bag of trail mix. He divided the trail mix equally amoung 5 friends. What fraction of the full bag of trail mix did each friend receive?
October 5, 2014

math
Leah picked 2.6 pounds of blackberries. Ashlyn picked 1.8 times as many pounds of blackberries. How many pounds of blackberries did Ashlyn pick?
October 5, 2014

Micro-Economics
Suppose that the government imposes a tax on heating oil. 1. Would the deadweight loss from this tax likely be greater in the first year after it is imposed or in the fifth year? 2. Would the revenue collected from this tax likely be greater in the first year after it is ...
October 5, 2014

CHEM
A 1.000g mixture of As4S6(s) and As4S4(s) was burned in excess O2. The products were As4O6(s) and SO2(g). The solid product had a mass of 0.905g. Find the mass % of As4S4(s) in the original mixture.
September 30, 2014

English
How did the man-made environment Olaudah Equiano was forced into shaped his opinions and perspectives towards the first white men he encountered?
September 28, 2014

physics
A third baseman makes a throw to first base 39.8 m away. The ball leaves his hand with a speed of 43.0 m/s at a height of 1.4 m from the ground and making an angle of 23.7 o with the horizontal. How high will the ball be when it gets to first base?
September 19, 2014

math
stamjps are sold in bookiets of 100,50, and 10.find as many different ways to buy 200 stamps as you can. record your work in the chart. could you give me some examples...please!
September 18, 2014

math
stamjps are sold in bookiets of 100,50, and 10.find as many different ways to buy 200 stamps as you can. record your work in the chart. I don't understan what to do here. help
September 17, 2014

Math
In rectangle PQRS, diagonal PR makes a 60 degrees angle with side PS. If PR =10, what is the area of the rectangle?
September 17, 2014

physical science
A simple lever is used to lift a heavy load. When a 60-N force pushes one end of the lever down 1.2 m, the load rises 0.2 m. Show what the weight of the load is 360N.
September 6, 2014

math
A square flower bed is 10 feet long on a side. How many plants are needed if they are spaced 6 inches apart around the outside of the bed? With solution
September 4, 2014

accounting
Westchase Supplies reported sales of $5,000,000, cost of goods sold of $3,200,000, operating expenses of $1,400,000 and income tax expense of $160,000 for the year What was the company’s net income for the year?
August 26, 2014

psychology last one tonight need to know if correc
_____________ is a biologically based style of interacting with the world that exists from birth. Fill in the blank. a. Culture b. Personality c. Temperament d. Attachment my answer is C
August 23, 2014

Psychology need to know if i have correct answer
What is the best explanation of the universal perspective in culture? a. Survival is related to the degree that people can adapt to their environments and to the contexts in which they live b. Evolutionary theorists believe people have evolved a set of motives and strivings ...
August 23, 2014

Psychology need to know if i have correct answer
Ms sue I believe now that i read it over it would be C
August 23, 2014

Psychology need to know if i have correct answer
What is a comprehensive theory on the structure of personality that contributes to our knowledge about the origins of psychopathology? a. Psychology b. Psychotherapy c. Psychoanalytic model d. None of the above My answer is B
August 23, 2014

Psychology need to know if i have correct answer
What would be a concern to take into consideration when interpreting data from cross-cultural studies? a. Effect sizes b. Whether the measures are equivalent c. Cultural attribution fallacy d. All of the above My answer is D
August 23, 2014

stats
A hospital claims that the proportion of full-term babies born in the hospital who weigh less than seven pounds is no more than 39% . Suppose that we want to carry out a hypothesis test for this claim, suspecting otherwise. State the null hypothesis and the alternative ...
August 20, 2014

english
In Wells, The War of the Worlds which of the following explains what made the humans so complacent? 1 Early in the 20th century came the great disillusionment 2. It is not only distant from time's beginning but nearer its end 3.Its physical condition is still largely a ...
August 15, 2014

english
In Wells, The War of the Worlds which of the following explains what made the humans so complacent?
August 15, 2014

college physics
sd 40 jbds
August 5, 2014

chemistry
What is a Reaction that you would expect when acetylsalicylic acid (aspirin) is heated in the presence of a CONCENTRATED acid? Thanks in advance!
August 4, 2014

chemistry
If a reaction has rate constant of 1.33 s^-1 at 206 deg C and an activation energy of 58.6 kj mol^-1. whats the rate constant at 358 deg C ?
July 23, 2014

chemistry
Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1
July 23, 2014

physics
A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= α t2− β t3, where α = 1.43m/s2 and β = 4.60×10−2m/s3 . 1)Calculate the average velocity of the ...
July 23, 2014

math
4x+5y=5 x=y-10
July 16, 2014

nau
4x+y==21 7x-4y=8
July 16, 2014

Ethics and moral reasoning
What is the difference between an internal good and an external good according to Maclyntyre's account?
July 11, 2014

Ethics and moral reasoning
Need help with Ethics and moral reasoning Reading Quiz 4
July 11, 2014

chem/math
I need help solving for x here (I dont get the right answer, which is supposed to be x=0.137) 3.88 = 3.74 + log (x/0.1) Please explain how you would get that answer Thank you
July 8, 2014

chemistry
What are the consequences of using only a very dilute solution of HCl or a very concentrated solution of HCl in attempting to return the pH? in attempting to return the pH to 7? What is a better alternative?
July 7, 2014

Statistics
The life of a blood pressure monitor has a normal distribution with an average of 40 years and a standard deviation of one year. What should the warranty be to replace a malfunctioning monitor with - if the company does not want to replace more than 1% of all the monitor. ...
June 6, 2014

Physics
A sled of mass 9.0 kg is sliding across a frozen lake with a speed of 5.0 m/s. A package of mass 4.0 kg is dropped onto it from above. Assuming there is no friction between the sled and the lake, what is the new speed of the sled?
May 26, 2014

Biology Please help
There are several genes that control eye color; eye color is therefore called a (A) Polygenic trait. Besides genes that directly control eye color, there are other genes that can affect the color of your eyes. For example, your eye color genes may code for green eyes, but if ...
May 23, 2014

Algebra
13a+9b-2a-4b
May 21, 2014

Calculus
Solve the differential equation dy/dx=3x^2y^2 with the condition that y(1)=4. I know that y= -1/(x^3 + c) but what do I do with the y(1)=4 part?
May 18, 2014

Calculus
The marginal revenue for x items in dollars is given by R′(x)=−4.5x+6. Determine (a) the revenue function and (b) the demand function. I know the revenue function is R(x)=6x-2.25x^2 just by finding the antiderivative. demand = revenue - cost, but how do I even find...
May 18, 2014

Calculus
Find f(x) if f′(x)=(−3)⋅x+(−1) and f(−4)=−1. I know if you find the antiderivative of f'(x) it is -3x^2/2 - x + c but what do I do next to find the function f(x)?
May 18, 2014

Calculus
thank you and yes it was months
May 18, 2014

Calculus
The rate at which an item depreciates is proportional to its value at that instant. If an item is presently values at $70,000 and 10 months later it is valued at $22,222, when in years will it be valued at $19,999? I'm not sure what formula to use...
May 18, 2014

Calculus
okay thanks
May 18, 2014

Calculus
How long must 4500 dollars be left on deposit at 8 percent compounded quarterly to reach a total accumulation of 15825 dollars? I did A=P(1+ r/n)^nt so I got 15825 = 4500 ( 1 + 0.08/4)^4t, and got t = 3.24886 years...am I even using the right formula?
May 18, 2014

Calculus
thank you for your explanation :)
May 18, 2014

Calculus
sorry it's log(base6)(x+3)−log(base6)(x−5)=2 the x in front of log isn't part of it
May 18, 2014

Calculus
Solve for x log(base6)(x+3)−log(base6)(x−5)=2. I tried to factor out the log(base6) and got (x+3)^x/(x-5)=2, but I don't know how to solve that...
May 18, 2014

Calculus
okay
May 18, 2014

Calculus
oh right you just have to factor out the logbase5...thank you
May 18, 2014

Calculus
Find A so that 5log(base5)16807 − 3log(base5)7 = log (base5)A I don't even know how to start this one...should I remove the 5 and 3 in front of the logs?
May 18, 2014

Calculus
thanks that makes sense
May 18, 2014

Calculus
Using log2=.3010 and log5=.6990 compute log2000000. 100000/5 = 20000 so I just did 20000*.699 = 13980 and then added .301 which equals 13980.3 ^I know that was wrong
May 18, 2014

Calculus
thank you!
May 18, 2014

Calculus
Use the Laws of logarithms to rewrite the expression log(1000000x^19)in a form with no logarithm of a product, quotient or power. After rewriting we have log(1000000x^19)= A + Blog(x)? I know B = 19, but what's A?
May 18, 2014

Calculus
it still says I'm wrong, but thanks for trying
May 18, 2014

Calculus
so would concave up be (1.34205, 2.37222)?
May 18, 2014

Calculus
f(x)=[3x^13]e^(−7x) On which intervals is the function concave up and concave down? I know when you find the 2nd derivative, the x-values are 0, 1.34206, and 2.37222, and that the 2nd derivative > 0 at x=1.34205 and < 0 at 2.37222. How does this tell me the ...
May 18, 2014

Calculus
thanks
May 17, 2014

Calculus
The quantity Q of radioactive carbon remaining in a 200-gram wood sample at time t is given by the expression Q(t)=200e^(−0.000225⋅t). How much radioactive carbon remains in the sample after 100500 years? I just plugged in 100500 as t and got 3.02375 grams as an ...
May 17, 2014

Calculus
thanks!
May 7, 2014

Calculus
How much should be deposited into an account today if it is to accumulate to $32400 in 30 years if the account bears interest at 8.01% compounded monthly? I did A = 32400(1 + 0.0801/12)^(12*30) = $355,375, but that's wrong...
May 7, 2014

Calculus
ok thanks
May 6, 2014

Calculus
I thought it would just be A = 88e^(0.07*9), which equals 165.23 pounds, but apparently that's not correct...
May 6, 2014

Calculus
Poli 761 (a fictitious substance) decays by about 7% every day. How much of a 88 pound sample remains after 9 days?
May 6, 2014

Calculus
thank you!
May 5, 2014

Calculus
Why does 2ln6 - 2ln3 = ln4?
May 5, 2014

maths
1234567 x 7654321
April 29, 2014

Math
Write the inequality and solve: The product of a number and 7 is less than 28
April 27, 2014

geometry
Hi, could someone explain to me the steps I should take to solve the following problem. If radius BE is a perpendicular bisector of chord AC, then what is AB to the nearest tenth? BD is 7cm and DC is 9.
April 19, 2014

geometry
The radius of the earth is approximately 6371 km.If the international space station (ISS) is orbiting 353 km above the earth, find the distance from the ISS to the horizon(x)
April 16, 2014

geometry
10^2=x•(x+3x) Use quadratic formula to solve
April 15, 2014

Calculus
no, but thanks for your answer!
April 9, 2014

Calculus
Evaluate ∫(2x^3/√(1-x^4))dx I can't figure out what u and du is... please help thanks
April 9, 2014

Calculus
Given f(x)=−2x^3 -3x + 1, the value of the derivative of the inverse function, f^−1(x) at x=−21 is (f^1)′(−21)= ? please explain how to solve this
April 3, 2014

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