Thursday
April 24, 2014

Posts by erica


Total # Posts: 505

Science-Physics
You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s? *please list the steps to...

Algebra-Please check
1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I think according to my calcs the answer is (9) The range of f(x) = sqrt(3x-6) - 2 answers would be y<= (-2) y>= (-2) y> (-2) y<=(2) I think the answer is y <= -2, correct I don't get this one at all: So...

Calc
A body of an unknown temperature was placed in a room that was held at 30°F. After 10 minutes, the body's temperature was 0°F, and 20 minutes after the body was placed in the room the body's temperature was 15°F. Estimate the body's initial temperature....

Calc
The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the bacteria population. L...

Calc
Find the inverse of y = ln (x/(x-1))

Calc
The amount A(t) of a certain item produced in a factory is given by A(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of hours of production since the beginning of the workday at 8:00 am. At what times is the rate of production increasing most rapidly?

Calc
If f is the function defined by f(x) = cube root of (x² + 4x) and g is an antiderivative of f such that g(5)=7, then g(1) is approx. equal to...?

Calc
t(sec) | 0 | 2 | 4 | 6 | 8 | ____________|_____|_____|_____|____|_____| a(t) (ft/sec²) | 2 | 3 | 4 | 3 | 2 | The table for the acceleration of a particle from 0 to 8 seconds is given in the table above. If the velocity at t=0 is 4 feet per second, the approximation value ...

Calc
Let f and g be differentiable functions such that f(1) = 4, g(1) = 3, f '(3) = -5 f '(1) = -4, g '(1) = -3, g '(3) = 2 If h(x) = f(g(x)), then h '(1) = ?

Calc
Let f(t) = 1/t for t>0. For what value of t is f ' (t) equal to the average rate of change of f on [a,b]?

Calc
Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?

Calc
The volume of the solid formed by revolving the region bounded by the graph of y = (x-3)² and the coordinate axes about the x-axis is given by what integral?

Calc
If, for all real number x, f(x) = g(x) + 5, then on any interval [a, b], what is the area of the region between the graphs of f and g?

Calc
Let f(x) be the function defined by f(x) = {x, x≤0 x+1, x>0 The value of the integral of x(f(x))dx from -2 to 1 =?

Calc
If dy/dx = x²y², then d²y/dx² = ?

Calc
If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then the approximation is equal to what?

Calc
How do you solve ∫sin(3x+4)dx? I got the -cos(3x+4) part, but do you have to integrate the 3x+4 too? Does chain rule apply?

Calc
If t is measured in hours and f '(t) is measured in knots, then integral from 0 to 2 of f '(t)dt = ? (Note: 1 knot = 1 nautical mile/hour)

Calc
If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?

Calc
A line through the origin rotates around the origin in such a way that the angle, θ, between the line and the positive x-axis changes at a rate of dθ/dt for time t≥0. Give the expression for the rate at which the slope of the line is changing.

Calc
The graph of y = 3x^2 - x^3 has a relative maximum at what point?

chemistry
an electron in a one-dimensional box requires photons with a wavelength 8080 nm to excite it from the n=2 energy level to the n=3 energy level. calculate the length of the box

science
an electron in a one-dimensional box requires photons with a wavelength 8080 nm to excite it from the n=2 energy level to the n=3 energy level. calculate the length of the box

Calc
Find the integral of 2x/(x^2 + 6x + 13)dx

Calc
Verify the differentiation formula. d/dx[arcsin u] = u'/(sq. rt. (1-u^2))

Calc
Find the derivative of the function. y = x arccos x - (sq. rt. (1 - x^2))

Calc
Find the derivative of the function. h(x) = x^2 arctan x

Calc
Find the derivative of the function. f(x) = arctan (x/a)

Calc
Verify each identity. a) arcsin(-x) = -arcsin x; abs. val. (x) is less than or equal to 1. b) arccos(-x) = pi - arccos x; abs. val. (x) is less than or equal to 1.

Calc
Solve the equation for x. arcsin(sq. rt.(2x)) = arccos(sq. rt(x))

Calc
Find the area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.

Calc
You need 50 pounds of two commodities costing $1.25 and$1.60 per pound. a) Verify that the total cost is y=1.25x + 1.60(50 - x), where x is the number of pounds of the less expensive commodity. b) Find the inverse function of the cost function.

Calc
Find the inverse of f(x) = (x+2)/x

Calc
Use the derivative to determine whether the function is strictly monotonic on its entire domain and therefore has an inverse function. f(x) = cos [(3x)/2]

Calc
Locate any relative extrema and inflection points. y = (ln x)/x

Calc
Use implicit differentiation to find dy/dx. ln xy + 5x = 30

Physics
What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?

Binomial
Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions? a. -0.0675 b. -0.1250 c. 0...

Algebra HELP
How do I solve 2x-4=x-10?

eng
thank you, no i didn't see that the last time. i re-wrote both of the paragraphs instead of using you, i put them in plural form.

eng
the topic sentence in the first paragrhah is >Financing a car to purchase it can cost highly in interest rates. the topic sentence in the second paragrah is >When financing something there is interest that comes with purchasing it. Depending on credit status, interest ra...

eng
i need to know if i underlined the correct topic sentence. if not can you see the topic with in the two paragraphs? 1. When purchasing a car, it can cost more than what it is worth because of not developing the money to buy it. Financing a car to purchase it can cost highly in...

english
thank you, no i didn't see that the last time. i re-wrote both of the paragraphs instead of using you, i put them in plural form.

english
it is the second sentence. the underline didn't show up. so i typed it out. does it look correct?

english
i need to know if my sentences and grammar are clear, and if i have the correct topic sentence for each paragraph correct. 1. If something will cost more than what it is worth because, you do not have the money to buy it is you can purchase it by financing it. Purchasing somet...

ENGLISH
1.Purchasing something by financing it can cost you highly in interest rates. 2. When financing something you have interest that comes with purchasing it.

ENGLISH
I need to know if MY SENTENCES focus on one key point, The topic sentence relates to the paragraph as a whole, The content is comprehensive, accurate, and effective, Major points are stated clearly; are supported by specific details, examples, or analysis; and are organized lo...

english
thank you, are the sentences clear and concise,well-constructed, and on topic? grammar and puncuations correct?

english
ok thank you i will try again. here are the underlined words. paragrahp 1. < u > text < / u>cost< u > text < / u>worth< / u>cost< u >interest rates, needed,debt,cash, interest or debt,choice, has interest or not. papragraph 2. finance, inter...

english
i underlined the words but it didn't show up. here they are again. The paragraphs are related to the issue of how interest rates affect our purchasing decisions. The tone is appropriate to the content and assignment. Sentences are complete, clear, and concise. Sentences ar...

english
Erica P. com/155interest rates • In a total of 200 words, write two paragraphs with about how interest rates affect our purchasing decisions. • Identify the topic sentence in each by underlining it. I need to know if I underlined all of the topic sententeces, They ea...

adverbs adjectives in comparison Corr.3
1. Assignment: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. &#...

adver adjectives in comparison corrected
thank you for all of your help i really appreciate it.

adver adjectives in comparison corrected
did this correct the run-on?One day, Miyagi witnesses one of the beatings. He intervenes and single handedly defeats Johnny and his friends.

adver adjectives in comparison corrected
ok

adver adjectives in comparison corrected
is this corrct? In the karate kid 1984, version the mentor Mr.Miyagi was more graceful, (comparative) than Mr. Han when it came to his way of teaching.

adver adjectives in comparison corrected
thank you, im a bit confused on how i should correct the run-on. can you tell me what is missing or how i should reword it?

adver adjectives in comparison corrected
1. Assignment: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. &#...

adverbs,adjectives in comparison
thank you, how was my sentence structer?

adverbs,adjectives in comparison
t: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective. • Compare...

math
this math is so hard elp

physics
same here.I'm panicking because I don't understand anything in that class. Never again will I take physics online.

psychology
Today, most psychologists take ____ approach to human development. a nativist an empiricist a dualist an interactionist

Statistics
A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of ó = 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test.

Stats
A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test. (Note: ó is unknown.)

Stats
If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?

5th grade Math
I have to find the function rule that goes with this table... X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for an hour and can't find anything that works for all of them.

physics-please help!
The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.5 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 km/h in 4.2 ms. If the ...

physics
A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the centrifuge be operated?

physics
A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. (a) Find the satellite's orbital speed. (b) Find the period of its revolution. (c) Find the gravitational force acting on it.

graph on a plane
graph the inequality on a plane 3x+4y is less then or equal to 12

graph on a plane
graph the inequality on a plane 3x+4y is less then or equal to 12

Physics
θ = 30° x-direction: vi + vf cos θ = x 1.4m/s - 0.79m/s(√3/2) = 0.716m/s y-direction: vf sin θ = y 0.79m/s * 0.5 = 0.395m/s Speed = √(x² + y²) √[(0.716)² + (0.395²)] = 0.818 m/s Direction: Tan-¹ (y/x) = Tan-¹ (...

7th math
how to do 345x 7.899=

Physics
A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilograms at each of the three...

Math Problems
Pat worked 43 hours and received $7.25 per hour for regular pay and time-and-a-half for all hours over 40 hours. What were her weekly earnings? $22.83 $322.63 $269.75

Physics
The leg and cast in the figure below weigh 280 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 130 N. Determine the weight w2 and the angle á needed so that no force is exerted on the hip joint by the leg plus cast.

geometry
i meant geometry but im still stuck and i have 3 more questions about this

john marshall
i don't understand how to do this prblem what is ab=x +7,bc=17,ac =2x

math 5 grade
Idk just wanted to post

history
How did human history in North America during the period described in the Prologue differ from the events of Asia, Eurasia, and Europe? Be specific. How were these differences important to the international state of affairs in 1450? this is using the american nation: a history...

business
Choose one of the organizational departments, such as accounting, finance, HR, and so on of a business. What is the role of this department? What types of information does the department need? How does the department use that information?

math
how would i construct a truth table for (p and ~q) double arrow q (sorry inexperienced with the symbols and keyboard shortcuts).

math
how would i construct a truth table for ~q then p (or arrow p)

health
What would be a strength and a weakness for the center of disease control?

History Check
The _____ Plan, favored by _____ States, proposed giving States equal representation in a unicameral Congress.

English-Ms. Sue
Start by taking out all the details. They are good, but this is a summary not a report about the book. You can still summarize those points but not in depth. Hope I helped! :)

Algebra
solve by elimination method 5x+2y=-13, 7x-3y=17

reimbursement methodologies
medicare and medicaid financial issues put constraints on a. physician services

science
what roes do differnt parts of the eye play in seeing?

6th grade
If today is Tuesday, what integer stands for last Sunday?

psychology
How do various behaviors of social dominance and courtship display affect the evolutionary process?

Pre-calc-urgent
How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4

chemistry lab titration
Are the pH's at 5mL, 15mL, and 25mL equal the respective pKa's (11.60, 6.77, and 2.25) since they are all half-equivalence points?

math 10 general math
what is the yield for 8.5% compound continously?

math
What is a generalization for this set of polygons: square, hexagon and a pentagon

10th grade
The question is asking you what you'all did there?

Physics
I'm sorry, but that doesn't make sense to me, is there any other way you can explain it? Thanks.

Physics
A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving ball's original ...

biology
I believe that it is A

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