Thursday

January 29, 2015

January 29, 2015

Total # Posts: 1,555

**physics**

A 1.20 kg mass on a horizontal spring oscillates on a frictionless surface with a displacement as a function of time given by x(t) = 0.075cos(4.16t – 2.45). (Units are standard units.) a.) Find the time for one complete vibration. b.) Find the force constant of the ...
*July 31, 2012*

**Physics**

A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...
*July 29, 2012*

**physics**

A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...
*July 29, 2012*

**Physics**

If a wire of resistance R, resistivity ñ "roe", length L, and cross sectional area A, had its length doubled and radius halved, what would be the ratio of R'/R. Where R' is the new resistance of the wire. I thought it would be 4 times R, giving the ...
*July 26, 2012*

**physics**

A wire has a resistance of 27.2 ohms. It is melted down, and from the same volume of metal a new wire is made that is 3 times longer than the original wire. What is the resistance of the new wire? Resistance and length of wire are proportional, but what I am unsure of is if ...
*July 25, 2012*

**Physics**

A 1.20kg ball is rolled down a frictionless ramp whose top is 0.80m above a horizontal spring with ks = 800N/m. The ball reaches the horizontal just in front of the spring. a.) What is the kinetic energy of the ball just before it contacts the spring? b.) What is the velocity ...
*July 18, 2012*

**Math**

A tree one hundred cubits high is distant from a well two hundred cubits; from this tree one monkey climbs dow the tree and goes to the well, but the other leaps in the air and descends by the hypotenuse from the high point of the leap, and both pass over an equal space. Find ...
*July 15, 2012*

**Physics**

A revolving door consists of four rectangular glass slabs,with the long end of each attached to a pole that acts as the rotation axis. Each slab is 2.60m tall by 1.50m wide and has mass 39.5 . Find the rotational inertia of the entire door. If it's rotating at one ...
*July 5, 2012*

**Physics**

A skier starts from rest at the top of a hill that is inclined at 9.8° with the horizontal. The hillside is 170 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of friction is ...
*July 5, 2012*

**algebra**

Simplifying 2log(x + 1) + -2log(x + -1) + -1log(x + -1) Reorder the terms: 2glo(1 + x) + -2log(x + -1) + -1log(x + -1) (1 * 2glo + x * 2glo) + -2log(x + -1) + -1log(x + -1) (2glo + 2glox) + -2log(x + -1) + -1log(x + -1) Reorder the terms: 2glo + 2glox + -2glo(-1 + x) + -1log(x...
*July 5, 2012*

**ALGEBRA**

E=L X R 460 = L X 92 L= 460/92 = 5 amps
*July 4, 2012*

**Algebra & Trig**

Was there a picture given? I don't know if I can answer the question without a picture.
*July 4, 2012*

**Physics **

An object slides down a frictionless 33 degree incline whose vertical height is 54.0 cm. How fast is it going in meters/second when it reaches the bottom?
*July 2, 2012*

**Physics **

A spring whose spring constant is 650 N/m is compressed 0.600 m. What speed (in meters/second) can it give to a 0.100 kg ball when released
*July 2, 2012*

**Physics **

What is the minimum work in joules needed to push a 1460 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)
*July 2, 2012*

**physics**

A 1370 kg car rolling on a horizontal surface has a speed of 20 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 5.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.)
*July 2, 2012*

**physics**

Why do the magnetic poles of cans reverse when turned upside down?
*July 1, 2012*

**mathematics**

what is seven-digit number if the ones digit is the sum of the millions digit and thousands digit is and the digits is the number from the largest value to the smallest place value are consecutive numbers.
*June 19, 2012*

**Mathematics**

how many times greater is the place value of a digit of a number than the place value of the next digit to its right?
*June 19, 2012*

**Chemsitry**

Use these data to estimate Avogadro's number. Palladium crystallizes with a face-centered cubic structure. It has a density of 12.0g/cm^3 , a radius of 138 pm , and a molar mass of 106.42 g/mol .
*June 17, 2012*

**English III**

#4 is wrong
*June 9, 2012*

**Social Studies 7R - DBQ (PLZ read!!!)**

I just need to find out the similarities between the south and the north (Sectionalism) After this I'm done with my essay but then again I have to go over it
*June 1, 2012*

**Social Studies 7R - DBQ (PLZ read!!!)**

I'm almost done with my essay. I just have to choose one more document which means that I have to write another paragraph and I have to write the conclusion. Plus I want to add something for my second paragraph. the similarities between the south and the north, ...
*June 1, 2012*

**literature**

thank you!
*May 28, 2012*

**literature**

in the book Life of Pi. Describe the difference between the two stories Pi tells? thanks!
*May 28, 2012*

**Financial Accouting**

Prepare a 10-column work sheet for fiscal year 2005, starting with the unadjusted trial balance and including adjustments based on these additional facts: a. The supplies available at the end of fiscal year 2005 had a cost of $3,200. b. The cost of expired insurance for the ...
*May 27, 2012*

**chemistry**

are you wanting to know what heat capacity is?
*May 2, 2012*

**English 2**

Thank you! But, just noting, does she not tell Caesar that they will send Mark Antony to the Senate House to say that he is not well??
*May 2, 2012*

**English 2**

Shakespeare uses Calphurnia to build suspense about what will happen in all of the following ways except a.urging Caesar not to go to the Senate. b.recounting all the disturbing omens. c.suggesting that Caesar pretend he is ill. d.relating that she dreamt Caesar was ...
*May 2, 2012*

**calculus**

Rotate the region enclosed by the given functions around the x-axis. Determine the volume. y=sqrt(sinx) ; y=0 ; x=0 ;x=pi limits are 0 to pi
*May 1, 2012*

**calculus**

Rotate the region enclosed by the given functions around the x-axis. Determine the volume. y=x^2+2x+1 and y=2x+5 limits are -2 and 2
*May 1, 2012*

**calculus**

Find the total area enclosed by the functions given below. y=x^2+2x+1 and y=2x+5 limits are -2 to 2
*May 1, 2012*

**Geography Help??**

show how society and family life compare and contrast in the Pacific Rim? I don't need an answer, just an explanation please. I don't know what that means..
*April 29, 2012*

**6th G-Math**

1.Which of the following best describes the graph of x > 2 ? A. Closed dot at x = 2, and shading to the right B. Closed dot at x = 2, and shading to the left C. Open dot at x = 2, and shading to the right D. Open dot at x = 2, and shading to the left
*April 24, 2012*

**6th G-Math**

Which table (A or B) matches this description: When the input is 0, the output is 0. As the input increases by 1, the output increases by 6. Table A Input Output 0 0 1 6 2 12 Table B Input Output 0 0 1 6 2 36
*April 23, 2012*

**math **

mike knits and sells them for $36 at the street fair every other week. it costs him about $19 for the yarn for each scarf and $8 for the other decorations he uses on them.mike estimates that he makes about 75% profit on each scarf he sells. is mike's estimate correct ?
*April 15, 2012*

**6th G-Math**

If the ratio of men to women in a movie theater is 1.00 when written as a decimal, what must be true? A. The ratio of women to men in the theater is 0.50. B. The ratio of women to men in the theater is 2.00. C. The ratio of women to total people in the theater is 0.50. D. The ...
*April 15, 2012*

**Heat Transfer**

A factory would like to produce plain carbon steel strips with pieces of polyethylene plastic ﬁlm bonded on them. The bonding operation will use a laser that is already available to provide a constant heat ﬂux of q′′0= 85, 000 W/m2for a speciﬁ...
*April 15, 2012*

**Physics**

what 2 properties of carbon make it a good material to use for motor brushes?
*April 14, 2012*

**6th G-Math**

1.What is a reasonable estimate for the area of a circle with radius 4 cm? A. Area=12cm^2 B. Area=16cm^2 C. Area=24cm^2 D. Area=48cm^2
*April 9, 2012*

**math**

13 - 8x = 5x + 2 x= -11/-13?
*April 9, 2012*

**6th G Math**

Sam has started babysitting to earn extra money. On Thursday night she earned $26, on Friday night she earned $19, and on Saturday night she earned $24. What is the mean amount of money she earned during the weekend?
*April 8, 2012*

**science-anatomy**

How is static equilibrium accomplished? How is dynamic equilibium accomplished?
*April 7, 2012*

**science**

How does colorvision and night vision function?
*April 7, 2012*

**math**

sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?
*April 4, 2012*

**Trig**

1)y=1-tan(3pi-2x) Find period and phase shift 2)y=-sin(5x+3) Find amplitude,period,and phase shift 3)y=1-sin(3pi-2x)Find amplitude,period,and phase shift 4)y=2csc(2x-1)Find period and phase shift 5)Given the graph of y = sin (x), what transformation can be made to make the ...
*April 1, 2012*

**Trig**

y=sin(2pi*x-pi) find the amplitude, period, and phase shift
*April 1, 2012*

**Trig**

y=sec(2x+1) Find the period and phase shift. Sorry i'm really bad at these.
*April 1, 2012*

**Trig**

y=2tan(x-1) Find the period and phase shift.
*April 1, 2012*

**physics**

In this equation, vd is the speed of the detector, and vs is the speed of the source. Also, fs is the frequency of the source, and fd is the frequency of the detector. If the detector moves toward the source, vd is positive. If the source moves toward the detector, vs is ...
*March 28, 2012*

**Calculus**

solve: Sin2x=Sinx
*March 27, 2012*

**Chemistry**

How many mL of 3.00M HNO3 would you need to make exactly 100mL of 0.83 HNO3 by dilution with water? (The FM of HNO3 = 63.0.)
*March 14, 2012*

**english 11**

i put DDBADB and got 2/6 just saying
*March 14, 2012*

**chemistry**

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I(s) Picture NH3(g) + HI(g) At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.
*March 8, 2012*

**math**

If you deposit $10,000 in a savings account now, what interest rate compounded continuously would be required for you to withdraw $15,000 at the end of 6 years? B. A savings and loans facility offers a CD with a monthly compounding rate that has an APY of 6.25%
*March 7, 2012*

**world cultures**

i need help on knowing that the cultural changes between Umayyad and Abbasid. pleaseee! thank you
*March 5, 2012*

**chemistry**

How many grams of ice at -11.2 degrees C can be completely converted to liquid at 29.8 degrees C if the available heat for this process is 4.12×10^3 kJ? For ice, use a specific heat of 2.01 J/(g*degrees C) and delta H_fus = 6.01 kJ/mol.
*March 4, 2012*

**History**

Why is Lucius Lyon reluctant to give up the Toldeo Strip?
*February 25, 2012*

**statistics research**

What proportion of adults use between 15 and 23 gallons of gas per week if it is normally distributed with a mean of 16 gallons and a standard deviation of 5 gallons?
*February 24, 2012*

**Physics**

The hypotenuse of a right triangle is 29.0 centimeters. The length of one of its legs is 20.0 centimeters. What is the length of the other leg?
*February 22, 2012*

**Pre-Cal (polynomials)**

Look at the right end behavior of each function )\(as x -> infinitey). what about the function determines whether its graph wil point up or down on the right-hand side?
*February 22, 2012*

**Pre-Cal (polynomials)**

How does the degree of a polynomial function affect the end behavior?
*February 22, 2012*

**Pre-Cal (polynomials)**

what is the general relationship between the degree of a polynomial function and the number of "bends" or relative maximum and minimum points in the graph?
*February 22, 2012*

**GEOMETRY**

Which statement is the contrapositive of the following conditional: If a triangle is isosceles, then it has 2 congruent sides. a. If a triangle does not have 2 congruent sides, then it is not isosceles. b. If a triangle is isosceles, then it does not have 2 congruent sides. c...
*February 21, 2012*

**GEOMETRY**

What is the slope of line that passes thru (-4, -2) and (5, 1)?
*February 20, 2012*

**GEOMETRY**

Find the value of y if B is midpt of AC, and C is midpt of BD. AB=7y-2 BC=x+3 CD=9
*February 20, 2012*

**Chemistry**

Sorry here are the data: Values at 20 degrees Celcius ethanol : density (g/mL)= 0.789/ vapor pressure (torr)= 43.9 water: density (g/mL) =0.998/ vapor pressure (torr)= 17.5 I' m still confused on what you are telling me to do :( Can u please clarify...
*February 18, 2012*

**Chemistry**

A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? I got an answer of 15.45 torr and it marked me incorrect and said "Your answer is the the partial vapor pressure...
*February 18, 2012*

**physics**

a.) A 125 kg stone has an acceleration of 84.9 m/s2. Determine the net force acting on the stone. b.) A 45 N force is acting on a 757 kg slab. Determine the acceleration of the slab. c.) A 63.2 N force acts on a block and causes an acceleration of 85.1 m/s2. Determine the mass...
*February 13, 2012*

**Chemistry**

Thank you Dr. Bob! That was very helpful
*February 10, 2012*

**Chemistry**

Consider an ideal gas encloesd in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 20.0 L. w = ____ J now calculate the work done if this process is carried ...
*February 10, 2012*

**algebra**

Sarah blends coffee for Tasti-Delight. She needs to prepare 170 lbs of blended coffee beans selling for $3.59 per pound. She plans to do this by blending together a high-quality bean costing $5.00 per pound and a cheaper bean at $2.00 per pound. To the nearest pound, find how ...
*February 9, 2012*

**math**

THANK YOU!!!
*February 8, 2012*

**math**

write the expression using negative exponents. (4/3x)+(4/x^2)-(7x/5thsqrroot2x) and Write the fraction as a sum or two or more terms. (6x^3-8x^2+4)/(x^(1/4)
*February 8, 2012*

**Math**

if a polynomial function is of degree n, then the graph will have n-1 relative maximum and minimum points. Is this: Always True, Sometimes True, or Never True? It's really confusing me.
*February 7, 2012*

**Pre-Cal**

In terms of x, write expressions for the length, width, height, and volume of the boxes created in the activity. I just need an example, so i'll just give one box. X-1 length-20 width-14 height-1 volume-280
*February 6, 2012*

**Pre-Cal**

I have a piece of paper 22 in. long and 16 in. wide. I cut a 7 in. x 7 in. square from each corner. I then fold up the sides and form a box with an open top. What is the volume of this box?
*February 6, 2012*

**Homeostasis**

Genetic conditions that cause death or disability in young people would be more likely to be selected against (from an evolutionary standpoint) because those genetic conditions would get in the way of the person being able to reproduce and would therefore reduce the person&#...
*February 4, 2012*

**history**

I am, thank you so much, i really appreciate it :)
*February 2, 2012*

**history**

is it 1
*February 2, 2012*

**history**

The Anti-Federalists _____. 1.)opposed the ratification of the Constitution My answer2.)supported a stronger national government 3.)were a tiny minority of the population 4.)were infuriated by the Bill of Rights
*February 2, 2012*

**calculus**

Consider the function f(x)=65x−cos(x)+2 on the interval 0 less than or equal to x less than or equal to 1. The Intermediate Value Theorem guarantees that there is a value c such that f(c)=k for which values of c and k? Fill in the following mathematical statements, ...
*February 2, 2012*

**Physical Science**

a=change in vel./time 6m/s-0m/s divided by 4 sec. acc. = 1.5 m/s^2 F=ma F= (80 kg)(1.5m/s^2) F=120N Hope this helps! :D
*February 1, 2012*

**Math**

simplify: 3sqrt(2)+5sqrt(4)+8sqrt(2)-2sqrt(6)
*February 1, 2012*

**physics**

If instead, the swimmer makes 30.5 laps in the same pool in 3 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed. pool is 30 m long please answer in km
*January 27, 2012*

**physics**

If instead, the swimmer makes 30.5 laps in the same pool in 3 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed. pool is 30 m long please answer in km
*January 27, 2012*

**physics**

If instead, the swimmer makes 30.5 laps in the same pool in 3 h, determine the total distance the swimmer traveled, the swimmer's total displacement, the swimmer's average velocity, and the swimmer's average speed. -answer in km
*January 21, 2012*

**physics**

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 3 h, a swimmer makes exactly 30 laps in a swimming pool that is 30 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the ...
*January 16, 2012*

**Geometry**

Which is logically equivalent to ~p -> q? a.) ~q -> p b.) ~q -> ~p c.) q -> p d.) q -> ~p
*January 7, 2012*

**English 7 - Extra Credit Project (PLZ READ!)**

Um... Writeacher, I don't I'll be aloud to e-mail people.
*January 1, 2012*

**English 7 - Extra Credit Project (PLZ READ!)**

What is Rachel Renee Russell adress. I can't seem to find it. I'm really writing a letter to her and doing this as a extra credit project for english.
*January 1, 2012*

**FFA**

OK :) Thank You!!! :)
*December 31, 2011*

**Math**

Evaluate this function for x=-3 f(x)= 4x^3-5x^2/2x-4
*December 31, 2011*

**Math**

Monte has a small rectangular herb garden that has a length 3 yd longer than twice its width. If the area of the garden is 50 yd^2, what is the length of the garden, to the nearest tenth of a yard?
*December 31, 2011*

**Hard work I HAVE done already! :)**

yeah yeah thx
*December 30, 2011*

**Question**

I'm also going to take SAT's and ACT's next year if I get accepted to John Hopkins Talent Search. Plus I'm also doing ACT's and SAT's 2 in high school.
*December 30, 2011*

**Question**

Thank You!!! :) PS: It really helps :)
*December 30, 2011*

**Question**

Thanks!
*December 30, 2011*

**Question**

Ok. Have fuun but please reply my other post.
*December 30, 2011*

**Question **

I'M CURIOS SO DON'T JUST JUDGE ME AND BE RUDE i'M REALLY CURIOUS AND i FORGOT TO ASKED THIS QUESTION. DO NOT JUDGE ME!!!! Do I start taking SAT's and ACT's in grade 10th or 11th/12th grade???? I'm really curious.
*December 30, 2011*

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