Thursday

January 19, 2017
Total # Posts: 606

**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...

*January 9, 2011*

**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: ...

*January 8, 2011*

**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...

*January 6, 2011*

**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. ...

*January 6, 2011*

**Calc**

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

*January 3, 2011*

**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?

*January 2, 2011*

**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...?

*January 2, 2011*

**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 ...

*January 2, 2011*

**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) = ?

*January 2, 2011*

**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]?

*January 2, 2011*

**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?

*January 2, 2011*

**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?

*January 2, 2011*

**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?

*January 2, 2011*

**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 =?

*January 2, 2011*

**Calc**

If dy/dx = x²y², then d²y/dx² = ?

*January 2, 2011*

**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?

*January 2, 2011*

**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?

*January 2, 2011*

**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)

*January 2, 2011*

**Calc**

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

*January 2, 2011*

**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.

*January 2, 2011*

**Calc**

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

*January 2, 2011*

**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

*December 14, 2010*

**Calc**

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

*December 13, 2010*

**Calc**

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

*December 10, 2010*

**Calc**

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

*December 10, 2010*

**Calc**

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

*December 10, 2010*

**Calc**

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

*December 10, 2010*

**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.

*December 9, 2010*

**Calc**

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

*December 9, 2010*

**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.

*December 7, 2010*

**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.

*December 6, 2010*

**Calc**

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

*December 6, 2010*

**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]

*December 6, 2010*

**Calc**

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

*December 2, 2010*

**Calc**

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

*December 2, 2010*

**Physics**

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

*December 2, 2010*

**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...

*November 24, 2010*

**Algebra HELP**

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

*November 17, 2010*

**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.

*November 17, 2010*

**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 ...

*November 17, 2010*

**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...

*November 17, 2010*

**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.

*November 17, 2010*

**english**

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

*November 17, 2010*

**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 ...

*November 17, 2010*

**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.

*November 16, 2010*

**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 ...

*November 16, 2010*

**english**

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

*November 16, 2010*

**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, ...

*November 16, 2010*

**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 ...

*November 16, 2010*

**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 ...

*November 16, 2010*

**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. &#...

*November 13, 2010*

**adver adjectives in comparison corrected**

thank you for all of your help i really appreciate it.

*November 13, 2010*

**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.

*November 13, 2010*

**adver adjectives in comparison corrected**

ok

*November 13, 2010*

**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.

*November 13, 2010*

**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?

*November 13, 2010*

**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. &#...

*November 13, 2010*

**adverbs,adjectives in comparison**

thank you, how was my sentence structer?

*November 13, 2010*

**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...

*November 13, 2010*

**math**

this math is so hard elp

*November 8, 2010*

**physics**

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

*November 6, 2010*

**psychology**

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

*November 2, 2010*

**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.

*November 1, 2010*

**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.)

*November 1, 2010*

**Stats**

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

*November 1, 2010*

**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.

*October 27, 2010*

**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 ...

*October 27, 2010*

**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?

*October 18, 2010*

**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.

*October 18, 2010*

**graph on a plane**

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

*October 12, 2010*

**graph on a plane**

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

*October 12, 2010*

**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...

*October 7, 2010*

**chemistry**

mc(delta)T 50x1(100-37) =3,150

*September 21, 2010*

**7th math**

how to do 345x 7.899=

*September 18, 2010*

**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...

*September 16, 2010*

**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

*September 16, 2010*

**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.

*September 15, 2010*

**geometry**

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

*September 13, 2010*

**john marshall**

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

*September 13, 2010*

**math 5 grade**

Idk just wanted to post

*September 13, 2010*

**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...

*September 10, 2010*

**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?

*August 31, 2010*

**math**

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

*August 23, 2010*

**math**

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

*August 23, 2010*

**health**

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

*July 10, 2010*

**History Check**

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

*June 25, 2010*

**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! :)

*June 16, 2010*

**Algebra**

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

*June 11, 2010*

**reimbursement methodologies**

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

*May 14, 2010*

**science**

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

*May 11, 2010*

**6th grade**

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

*May 4, 2010*

**psychology**

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

*April 17, 2010*

**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

*April 15, 2010*

**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?

*April 7, 2010*

**math 10 general math**

what is the yield for 8.5% compound continously?

*April 4, 2010*

**math**

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

*February 1, 2010*

**10th grade**

The question is asking you what you'all did there?

*January 21, 2010*

**Physics**

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

*January 20, 2010*

**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 ...

*January 20, 2010*

**biology**

I believe that it is A

*January 20, 2010*