Sunday

March 29, 2015

March 29, 2015

Total # Posts: 79,473

**physics**

an arrangement of four disks are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 81.2 N on the wall to which it is attached. The tensions in the shorter cords are T1 = 62.7 N, T2 = 33.6 N, and T3 = 8.5 N. What are ...
*February 8, 2015*

**Math 1105**

if two identical squares have a total area of 18x^2+36x+18, find the length of one side of one of the squares
*February 8, 2015*

**physics**

A 0.60 kg object with an initial velocity of 3.0 m/s in the positive x direction is acted on by a force in the direction of motion. The force does +2.5 J of work. What is the final velocity of the object?
*February 8, 2015*

**Math**

A jet pilot is making a 1000 mile trip in her military Tomcat. She flies 800 mph for one hour and decides she wants to finish the trip so that she would have flown at an average of 1000 mph. How fast should she go to finish the trip and meet her goal?(Hint: Think carefully ...
*February 8, 2015*

**Math**

Find all pairs of integers whose difference is 5 and product is 234.
*February 8, 2015*

**Math**

The sum of two counting numbers is 243. Half of one number is four times the other number. What are the numbers? 121.1+122.2=243.2
*February 8, 2015*

**math**

A recipe for 1 batch of muffin included 2/3 cup of raisins. Ina made 2 1/2 batches of muffins. How many cups of raisin did she use. Is the answer 1 5/6
*February 8, 2015*

**finite math**

Recall from Example 1 that whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing three red marbles, five green ones, four white ones, and three purple ones. She grabs eight of them. Find the probability of the following event, ...
*February 8, 2015*

**college algebra**

4rrr
*February 8, 2015*

**Physics **

A light string is attached to both a hanging mass m1 = 5 kg and to a pulley of mass m2= 6 kg, and radius R = 0.75 m. If the pulley is a solid disc rotating about its center with a moment of inertia of I = 0.5*m2R2, and the string does not slip on the pulley, (a) what is the ...
*February 8, 2015*

**physics**

In the lab, a relativistic proton has a momentum of 1.00 × 10-19 kg · m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 108 m/s, m proton = 1.67 × 10-27 kg): *
*February 8, 2015*

**Chemistry **

For a one step reaction, the activation energy for the forward reaction is 40.0 kJ mol-1, and the enthalpy of reaction is -20.0 kJ mol-1. Calculate the activation energy for the reverse reaction. Is my answer correct? (40 kJ mol-1)-(-20 kJ mol-1) = 20kJ mol-1
*February 8, 2015*

**PreCalculus **

Can someone help me answer this question, so I would know what to do for a question like this next time? Thank you! A box contains 10 red chips, 20 blue chips, and 30 green chips. If 5 chips are drawn from the box, find the probability of drawing a.) exactly 4 green b.) at ...
*February 7, 2015*

**physics**

The velocity-versus-time graph is shown for a particle moving along the x-axis. Its initial position is x0 = 1.8m at t0 =0s. Part A What is the particle's position at t=1.0s? Part B What is the particle's acceleration at t= 1.0s? Part C What is the particle's ...
*February 7, 2015*

**physics**

A 0.25 kg particle moves along an x axis according to x(t) = - 10 + 3 t + 2 t2 - 5 t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.6 s ? Give an expression for the (a) x, (b) y and (c) z components.
*February 7, 2015*

**Probability**

Can someone help me answer this question, so I would know what to do for a question like this next time? Thank you! A box contains 10 red chips, 20 blue chips, and 30 green chips. If 5 chips are drawn from the box, find the probability of drawing a.) exactly 4 green b.) at ...
*February 7, 2015*

**Probability**

Can someone please help me solve this problem? If the probability of a baseball player's getting it in one time at bat is 0.326, find the probability that the player gets no hits in 4 times at bat. Thank you!
*February 7, 2015*

**chemistry**

Benzoic acid reacts with water to form the benzoate ion by the following reaction C6H5COOH(aq) + H2O(l) ⇀↽ C6H5COO−(aq) + H3O +(aq) The equilibrium constant for this reaction is 6.4 x 10−5 . In a 0.1 M solution of benzoic acid, what is the concentration...
*February 7, 2015*

**chemistry**

A soluction of 100 mL of 0.2 M NH3 is titratedwith 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10−5 1. 5.30 2. 1.00 3. 1.48 4. 10.3
*February 7, 2015*

**chemistry**

Which of the following has the HIGHEST pKa? 1. HClO3 2. HBrO 3. HClO 4. HIO 5. HClO4
*February 7, 2015*

**chemistry**

What would be pH of a 0.01 M solution of a very expensive weak base, unobtainamine, whose pKb is 3.8? 1. 2.9 2. 14 3. 2 4. 7 5. 11.1
*February 7, 2015*

**chemistry**

Arrange the acids I) hydrogen selenate ion (HSeO− 4 ), pKa = 1.92; II) phosphorous acid (H3PO3), pKa1 = 2.00; III) phosphoric acid (H3PO4), pKa = 2.12; IV) selenous acid (H2SeO3), pKa = 2.46; in increasing order of strengths. 1. IV, III, II, I 2. II, IV, III, I 3. I, III...
*February 7, 2015*

**chemistry**

The term “Ka for the ammonium ion” describes the equilibrium constant for which of the following reactions? 1. NH3 + H2O ⇀↽ NH4 + + OH− 2. NH+ 4 + OH− ⇀↽ NH3 + H2O 3. NH3 + H3O + ⇀↽ NH+ 4 + H2O 4. NH+ 4 + H2O ⇀&#...
*February 7, 2015*

**chemistry**

Which of the following is the STRONGEST acid? 1. CH3COOH 2. CH3CH2OH 3. CHCl2COOH 4. CH2ClCOOH 5. CCl3COOH
*February 7, 2015*

**math**

You need to give 6mg of a drug, The drug on hand has a concentration of 24mg per ounce. How many teaspoons will you give?
*February 7, 2015*

**writting skills**

Once you acquire these two basic skills, you'll be able to transform a vague idea in your mind into a coherent piece of writing. A. Describing people and writing conversation B. Using the Internet and the on-line catalog C. Doing interviews and ...
*February 6, 2015*

**Math**

if z=3i and w=5i, then z<w. True or False?
*February 6, 2015*

**writting skills**

The World Almanac is a book of A. facts and statistics. B. living notable Americans. C. synonyms. D. articles published in magazines.
*February 6, 2015*

**Chemistry- Acid Base**

What is the conjugate acid of O2^-2
*February 6, 2015*

**math**

x2 + x − 42
*February 6, 2015*

**Chemistry**

Thank you anyways, I apologized for not giving enough information but I found that the answer is False.
*February 6, 2015*

**Chemistry**

After the volatile liquid has been added to the Erlenmeyer flask, the total pressure in the flask equals the vapor pressure of the volatile liquid. True or False?
*February 6, 2015*

**spinner**

packing a suitcase with 3 different color sweatshirts only have room for 2 sweatshirts in the suitcase how many different combinations of 2 sweatshirts could be pack
*February 6, 2015*

**chemistry**

a block of metal with dimensions of 5.6 cm and 11 cmm weights 5.55 kg.what is the density of the metal
*February 6, 2015*

**social studies**

what was one important political result of the Canadian constitution of 1982
*February 6, 2015*

**math**

How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate?
*February 6, 2015*

**math**

A man sold 3/5 of the goods at 20% loss, at what profit% should he sell remaining goods to get 10% profit on the whole?
*February 6, 2015*

**Crime and Society**

What do you think best explains high incarceration rates for Blacks compared to their percent of the general population.
*February 6, 2015*

**Crime and Society**

What explains the high incarceration rates for Black men?
*February 6, 2015*

**Crime and Society**

Is institutionalized racism to blame for these disparate rates?
*February 6, 2015*

**Crime and Society**

What explains high incarceration rates for Blacks on death row?
*February 6, 2015*

**English**

Reread lines 9-12 in “I Ask My Mother to Sing.” What idea is suggested by the image of the water lilies filling with water, spilling it into the lake, and filling it up again? Consider the event described in the final stanza. What are some ideas? I know it has ...
*February 6, 2015*

**math **

Place the numbers below on a number line: ∛7 , -3 , 0 , 105/59 , 7^1/3 , 7^2/3 I tries: ∛7 = 1.912 -3 0 105/59 = 1.779 7 1/3 = 7.33.. <-- right? 7 2/3 = 7.66.. <-- right? first of all ,does the answer i convert right?
*February 6, 2015*

**math**

Alyssa claims that dividing by 4/5 is the same thing as multipying by 5 then dividing by 4. Is she correct?explain why or why not
*February 5, 2015*

**Physics**

Determine the ratio of Earth's gravitational force exerted on an 80-kg person when at Earth's surface and when 1000km above Earth's surface. The radius of Earth is 6370 km. I have tried (6370)^2/(7370)^2 = 0.747 and it is wrong??
*February 5, 2015*

**geometry**

2. A person who is 1.5 meters tall casts a shadow that is 8 meters long. The distance along the ground from the person (N) to the flagpole (G) is 32 meters. Find the height of the flagpole (FG) showing all calculations.
*February 5, 2015*

**(REALLY NEED HELP )**

7x + 4
*February 5, 2015*

**math**

Alyssa claims that dividing by 4/5 is the same thing as multiplying by 5 then dividing by 4. Is she correct
*February 5, 2015*

**science**

m=0.0045kg E=3.6 J for .13m compression T=? Vm @ .05m from equilibrium= ? P.E.= .5KA^2 therefore find K=F/x (.0045x9.8)/(.13) K =.34N/m T=2pixsprt(m/K) T= 2xpi x sprt (.0045/.34) T= .72 secs B) E=PE+KE 3.6= .5 (3.4)(0)^2 + .2 (.0045)(v^2) v^2=1600 v=40
*February 5, 2015*

**English**

Describe the setting of “Grape Sherbet” as you visualize it. A graveyard with a family? Also, is the father dead or alive. I know this is happening on Memorial Day, but it doesn't seem clear whether the father is dead.
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral [3sqrt(x)(2x^2-4)]dx
*February 5, 2015*

**physics**

A person walks up a stalled 15 m long escalator in 110 s. When standing on the same escalator, now moving, the person is carried up in 70 s. How much time would it take that person to walk up the moving escalator?
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral (7tan^2x+12)dx
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral [(7t^2+6t-15)/t^4]dt
*February 5, 2015*

**Calculus**

Solve the differential equation f"(x)=x^2, f'(0)=3, f(0)=-1
*February 5, 2015*

**Math**

There were 100 children at a carnival. 60 of them were boys. Express the number of girls as a fraction of the total number of children at the carnival
*February 5, 2015*

**art**

My text book only spoke of how he didn't use sponsorship and then relied on funds from his own sources (such as selling art pieces). It is so true what you are saying Ms. Sue, and I thank you so much for helping me. I will speak it over with my art teacher tomorrow in ...
*February 5, 2015*

**art**

A then?
*February 5, 2015*

**art**

9. Why did artist Christo think it was important not to rely on any donors when he wrapped the Miami islands in pink? A. Christo was independently wealthy and did not need donors. *** B. Christo wanted to prove he could do everything on his own, independently. C. Christo ...
*February 5, 2015*

**English**

An overused expression is a
*February 5, 2015*

**Calculus**

I am in a car and travel for 12 minutes. Below are the speeds in mph, recorded every two minutes. Use trapezoids, right-bound rectangles, and midpoint rectangles to estimate the distance I traveled. Min 0 2 4 6 8 10 12 Speed 20 22 35 46 50 50 20 Trapezoids: Right-bound ...
*February 5, 2015*

**language arts **

in the poem the sidewalk racer how does the speaker feel
*February 5, 2015*

**physics**

A ferryboat is traveling north with a speed of 5.50 m/s relative to the water. A passenger is walking with a velocity of 2.50 m/s due east relative to the boat. What is the velocity (magnitude only) of the passenger with respect to the water?
*February 5, 2015*

**math**

what is the mystery number?greater than 1oo -odd more than 3 tens less than 150 the sum of the digits is 12?? please help
*February 5, 2015*

**Math**

Oh I was looking at just the 0. I understand Thank you!
*February 5, 2015*

**Math**

would 1,661.06 turn into 1,661 if I rounded it to the nearest tenth ?
*February 5, 2015*

**Math**

never mind I got the answer. It's c.. I was confusing myself lol
*February 5, 2015*

**Math**

oops i meant its a triangle and pentagon put together
*February 5, 2015*

**Math**

What's the value of the missing angle *picture of a triangle and square put together which basically makes a hexagon. angles are 90 degrees, 90 degrees, 130 degrees, 130 degrees. I have to find the last angle.* A. 50 degrees B. 60 degrees C. 100 degrees D. 240 degrees I ...
*February 5, 2015*

**social studies 8 ANSWER PLEASE!!!!!!!!**

Its d. National road
*February 5, 2015*

**art**

Thanks for the help bros
*February 5, 2015*

**art**

Thanks for the help bros
*February 5, 2015*

**art**

help?thanks, 3 and 9 were both c?
*February 5, 2015*

**art**

So #3 was c and so was #9? Great! :)
*February 5, 2015*

**art**

What were the rest of the answers ?
*February 5, 2015*

**art**

Which ones were wrong?
*February 5, 2015*

**art**

#3 is C and #9 is C as well
*February 5, 2015*

**english (check my answer)**

What is a key characteristic of a refrain in a poem? a. imagery b. alliteration c. repetition d. rhyme I think it's c?
*February 5, 2015*

**Maths**

Have you found the answer yet?
*February 5, 2015*

**physics**

As you walk to class with a constant speed of 1.65m/s , you are moving in a direction that is 18.8∘ north of east. How much time does it take to change your displacement by 21.0m east?
*February 5, 2015*

**American history**

Which of the following is true with regards to the navigation acts by the eighteenth century
*February 5, 2015*

**english**

You are chosen to debate the motion " boys should not help in the kitchen" write fir the motion.
*February 5, 2015*

**math**

ans
*February 5, 2015*

**chemistry**

A gas sample occupies a volume of 400.0ml at 298.15k at costant pressure. what is the final temperature when the volume occupied decreased by 39.0
*February 5, 2015*

**physics**

Three point charges are arranged along the x-axis. Charge q 1 = +3.00 ìC is at the origin, and charge q 2 = -5.00 ìC is at x = 0.200 m . Charge q 3 = +8.00 ìC . Where is q 3 located if the net force on q 1 is 7.00 N in the −x direction?
*February 4, 2015*

**algebra**

a dvd costs twice as much as a music cd. jack buys 2 dvds and 2 cds and spends 45 dollars. determine how much one cd costs
*February 4, 2015*

**Math**

Using five 2's make the following numbers: 1 5 7 9 Thank you for your help
*February 4, 2015*

**Math**

Using five 2's make the following numbers: 1 5 7 9 Thank you for your help
*February 4, 2015*

**Criminal investigation**

What is grand larceny
*February 4, 2015*

**Math**

Ted bought items that cost $5.89 and $15.38.What was the total cost including 6% sales tax? Explain how how got our answer.
*February 4, 2015*

**materials science**

its fine
*February 4, 2015*

**materials science**

idk!!!
*February 4, 2015*

**materials science**

what are the two sources of electricity on the atoll of utrik that are not based on fossil fuels?
*February 4, 2015*

**math**

Caitlyn bought a helium tank to fill spherical balloons for a party. If the diameter of the filled balloons are 14.4 inches, how much helium would be needed in each balloon?
*February 4, 2015*

**science**

an object was placed into a container of water. the arrow shows that thermal energy is flowing from the water to the object. what is a valid conclusion
*February 4, 2015*

**Science**

1)What is the relationship between inertia and mass? 2)Jellyfish sometimes squeeze in the side of their bodies.This pushes a stream of water from the back end of their bodies,according to newtons third law of motion,How will this behavior affect the movement of the jelly fish...
*February 4, 2015*

**physics**

3369800
*February 4, 2015*

**Chemistry**

If a temperature increase from 11.0∘C to 22.0∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?
*February 4, 2015*

**math**

x,y
*February 4, 2015*

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