Wednesday

September 17, 2014

September 17, 2014

Total # Posts: 418

**engineering science**

An object weighing 60N rest on a slope forming an angle of 17.5 degrees with the horizontal. A force of 44N parallel to the sloping surface just moves the object upwards. Calculate the frictional force.
*September 10, 2014*

**statistics**

A statistical analysis firm is hired to analyze the failure rate of a manufactured product. Which margin of error below would best indicate that the data used by the firm is a valid representation of the population? I don't understand the question they're asking me. ...
*September 7, 2014*

**science**

Need help with a summary of sexual an asexual reproduction
*September 4, 2014*

**Math**

so what is the answer
*August 24, 2014*

**Math**

You want to create an open rectangular box from a rectangular box. from a square piece of cardboard 20 inches by 20 inches. You will cut a 3 inch square from each corner. Draw a diagram and find the length of the box. Can someone help me with this diagram thing. I can't ...
*August 24, 2014*

**Math**

yes I got it right. Thankyou Ms.Sue (:
*August 24, 2014*

**Math**

A piece of fabric is 52 inches long. You cut the fabric into two pieces. The first piece is x inches long. The second is 14 inches longer than the first. Draw a diagram & solve for x.
*August 24, 2014*

**Math**

You want to create an open rectangular box from a rectangular piece of cardboard. The cardboard has length 14 in and you want to cut 2 in squares from each corner. Draw a diagram. What is the length of the box?
*August 24, 2014*

**Math**

the perimeter of a rectangular park is 1080 yds. The width of the park is 240 yds. What is the length of the park? What is the amount of grass that the township has to mow & fertilize?
*August 24, 2014*

**MATH HELP**

can you explain why?
*August 22, 2014*

**MATH HELP**

can you can why? detailed please
*August 22, 2014*

**MATH HELP **

shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks?
*August 22, 2014*

**Science**

how to reduce the resistive force while freewheeling?
*July 24, 2014*

**math**

If the tax on an item is $16 and jerry wanted to buy two how much would the two items cost without the tax? Hint: Tax is 20% of the cost of the item.
*July 12, 2014*

**maths**

okay i got it!thanks!!
*July 12, 2014*

**maths**

why3x+3=0 ??
*July 12, 2014*

**maths**

Given(3x+3)/(6y+1)=3,find the value of7x/3y.
*July 12, 2014*

**Chemistry**

In aqueous solution, hydrochloric acid, HCl, and sodium carbonate, Na2CO3 react to produce gaseous carbon dioxide, CO2, water, H2O and sodium chloride, NaCl. A 10.0 g impure sample of Na2CO3 is dissolved completely in water; then treated with 3.00 mol L−1 HCl to evolve ...
*June 15, 2014*

**English 8**

Infinitive phrase and how it is used My gram taught me to make lentil soup To make lentil soup infinitive I'm not sure if it is a noun or adv.
*May 20, 2014*

**English8**

Find infinitive phrase and tell if itis used as a noun adj or adv To have a balanced diet keep the food triangle in mind. To have a balanced diet is phrase. Is it an adverb
*May 20, 2014*

**math**

Andre picks a card at random. Without putting the first card back, he picks a second card at random. What is the probability that both cards will be hearts. The cards showing are three hearts and two diamonds
*May 8, 2014*

**math**

i dont understand what they are asking me to do when they give me a quhat looks like this (write acute,right,or obtuse for each angle 1.AFD 2.BFD and thers a bunch of line that intersect off to the side
*February 23, 2014*

**Physics**

A 30m high cylindrical water tank has a diameter of 14m. The tank is two-thirds full of water. What is the pressure at the bottom of the tank?
*February 19, 2014*

**math**

John had $24.He spent 2/3 of his money.How much he has left.
*January 30, 2014*

**Chemistry**

A solution is prepared by mixing 45.00 mL of 0.022 M AgNO3 with 13.00 mL of 0.0014 M Na2CO3. Assume volumes are additive. Calculate [Ag+], [CO32-], [Na+] and [NO3-] after equilibrium is established.
*November 15, 2013*

**Chemisty**

Consider a 1.50 L aqueous solution of 3.75 M NH3, where 17.5 g of NH4Cl are dissolved. To this solution, 5.00 g of MgCl2 are added. a. What is [OH-] before MgCl2 is added? b. Will a precipitate form? c. What is [Mg2+] after equilibrium is established? I don't need the ...
*November 14, 2013*

**physics**

The position of a particle moving along the x axis is given by x=3.0t^2 - 1.0t^3 , where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction
*November 14, 2013*

**Chemistry**

Thanks so much! I never would've figured that out.
*November 12, 2013*

**Chemistry**

A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.
*November 12, 2013*

**Chemistry**

When excess NaOH is added to Zn(OH)2, the complex ion Zn(OH)4 2- is formed. Determine the molar solubility of Zn(OH)2 in .10 M NaOH. Compare with the molar solubility of Zn(OH)2 in pure water. I thought I knew how to do this problem, but I'm not getting the right answer. ...
*November 10, 2013*

**Chemistry**

*To be entirely correct, you'll want to use the values for hydrogen and oxygen gas. I'll let you figure those out, along with the molar ratios for hydrogen gas and water and oxygen and water.
*November 9, 2013*

**Chemistry**

Using the molar masses of hydrogen and oxygen, you can discover your limiting reactant (the reactant that would produce the least water). The water produced by your limiting reactant would be the amount of water formed. (2.4 g H)(1 mol H/1.008 g)(1 mol H20/2 mol H)=1.19 mol ...
*November 9, 2013*

**Chemistry**

Use standards entropies and heats of formation to calculate delta Gf at 25C for a. cadmium (II) chloride (s) b. methyl alcohol, CH3OH (l) c. copper (I) sulfide (s) I really have no idea where to start with this problem. I have no idea how to calculate delta Gf, and everything ...
*November 9, 2013*

**Physics**

A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How long does it take the daredevil to cross the...
*October 17, 2013*

**Math**

j+4/6=8/12
*October 9, 2013*

**American History**

Why did the 21 amendment repeal the 18 amendment?
*October 8, 2013*

**calculus**

Find the derivative of the function. G(y) = (y − 1)3/ (y2 + 2y)7
*October 3, 2013*

**probability**

if you have a spinner with 3 parts. 1 white 2 blue. and you spin the spinner 90 times how many times do you expect the spinner to land on blue
*September 27, 2013*

**math**

Recently a census was taken on space station Gamma. Of the 100 residents interviewed, 75 traced their ancestry to the planet Omicron, 85 traced their ancestry to the planet Omega and 60 residents traced their ancestry to both planets. How many residents had ancestors from ONLY...
*September 3, 2013*

**geography**

We need help with finding Canada's fourteen capitals can u help us please
*August 18, 2013*

**Basic Physics**

2.5 h = 9000s 10m/s x 9000s = 90000m
*June 26, 2013*

**Government**

United States
*June 25, 2013*

**Government**

The President can choose to get rid of democracy. True or False?
*June 25, 2013*

**Math**

What is the integral of dx/(x^3-9x)? Please post steps too please!
*June 4, 2013*

**math**

Yes. Thank you.
*May 25, 2013*

**math**

If = sin-10.398, then =_____o_____' _____". Round to the nearest second.
*May 25, 2013*

**giving up**

i'm depressed that no-one has answered my science question so i'm giving up and i don't care if i fail my science because it will be all googles fault the only thing i know about the xenon 135 is that it's a tennis/squash racket and i needed the element xenon ...
*May 21, 2013*

**none**

read my question above
*May 21, 2013*

**Science**

Identify and describe the type of radiation emitted during the radioactive decay of the radioisotope xenon 135
*May 21, 2013*

**math**

a jar contains two red and five yellow marbles. A marble is drawn at random and then replaced. A second draw is made at random. find the probability that both marbles are red?
*May 15, 2013*

**chemistry**

magnesium in flashbulbs burn according to the equation 2Mg + O2 ---> 2MgO what mass of Mg combines with 5.80 L of O2 measured at STP?
*May 2, 2013*

**english**

St. Patricks day is on March 17, every day. i am glad to answer this question for you.
*April 23, 2013*

**Physics**

i am not sure
*April 23, 2013*

**geometry**

The ratio of two similar prisms is 2:5 the volume of the larger is 375cm3 if sand is being poured into the smaller prism at 3cm3 per second how many seconds will it tAke to fill the smaller prism?
*April 7, 2013*

**Math**

10 cups
*March 25, 2013*

**Math**

Suzanne has a liter of apple juice. How many cups with a capacity of 100 mL can she fill with apple juice?
*March 25, 2013*

**math**

A basketball has a diameter of 29.5 inches. If the basketball is fully inflated, about how many cubic inches of air will it hold?
*March 25, 2013*

**English**

Which senses are appealed to in these lines from Macbeth? Nay, had I pow'r, I should / Pour the sweet milk of concord into hell, / Uproar the universal peace… A. smell, taste, and touch B. hearing, sight, and smell C. sight, taste, and hearing D. hearing, taste, and ...
*March 20, 2013*

**Math**

find the average rate of change from 1 to x Find the average rate of change from 1 to 3 Using f(x) = -2x^2+6x
*March 11, 2013*

**Math**

find the average rate of change from 1 to x Find the average rate of change from 1 to 3 Using f(x) = -2x^2+6x
*March 11, 2013*

**Mathematics. Geometric sequences.**

2+4+8+...is a geometric sequence. Prove the sum of the first n terms is two less than the (n+1)the term.
*March 10, 2013*

**Government**

When has the constitution protected 2 fundamental principles? When has it failed to protect 2 fundamental principles?
*March 3, 2013*

**Chemistry**

How many grams of oxygen are collected in a reaction where 247 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr? And would i just convert 697 torr into atm and use that for pressure? And how do i find the molar mass of the ...
*February 18, 2013*

**Chemistry**

It takes 200. seconds for a sample of carbon dioxide to effuse through a porous plug and 280. seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.
*February 18, 2013*

**Chemistry**

So would i just convert 697 torr into atm and use that for pressure? or what do i do with the 25C/760?
*February 18, 2013*

**Chemistry**

How many grams of oxygen are collected in a reaction where 247 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr?
*February 18, 2013*

**Math**

Write an equation you could use to solve each problem. Solve each equation by systematic trial. Josie had only nickels in her purse. The value of the coins was 80 cents. How many nickels were in Josie's purse?
*February 7, 2013*

**Physics**

A total of 100000 kg of water per second flows over a waterfall 30 m high. If half of the power this flow represents could be converted into electricity, how many 100 watt lightbulbs could be supplied?
*February 2, 2013*

**Social Studies**

what 5th grade social studies word starts with Y,Z,and N?
*December 18, 2012*

**math**

I family of ducks contains 7 ducks which are 44 lbs. The other wieghs 32 lbs (no amount of ducks given) How much does each duck and duckling weigh in each group THEY HAVE TO WEIGH THE SAmE IN EACH GROUP
*December 16, 2012*

**Problem Solving: Writing to Explain**

how do you order least to greatest for fraction 3/12 1/6 and 1/3
*December 4, 2012*

**math**

Andy and Sam are saving money to go on their senior trip. The amount of money that Andy will have at the end of each week, w, can be expressed at A(w) = 20w + 300. The amount of money that Sam will have at the end of each week, w, can be expressed at S(w) = 15w + 400. They ...
*December 3, 2012*

**math**

What is 43 over 15
*November 28, 2012*

**Science**

Can you explain tectonic plates?
*November 27, 2012*

**Physics**

Ocean waves pass through two small openings in a breakwater. This time the openings are d = 21 m apart. You're in a small boat on a perpendicular line midway between the two openings, L = 80 m from the breakwater. You row x = 32 m parallel to the breakwater and find ...
*November 27, 2012*

**PLEASE HELP!! DESPERATE!!! (MATH)**

The derivative of a function is f'(x)=x(x+2)(x-5). Find the value of x at each point where f has a (a) local maximum, (b) local minimum, or (c) point of inflection
*November 25, 2012*

**Math**

The derivative of a function is f'(x)=x(x+2)(x-5). Find the value of x at each point where f has a (a) local maximum, (b) local minimum, or (c) point of inflection
*November 25, 2012*

**Math**

For y= (3x)/(2e^x+e^-1), use graphing techniques to find the approximate intervals on which the function is: a) increasing b) decreasing c) concave up, d) concave down then find any e) local extrema f) inflection points
*November 25, 2012*

**Math**

Thank you :)
*November 24, 2012*

**Math **

A runner is 22 km east and 15 km south of his starting point, how long would it take him to return to his starting point in a direct Line if he can run at 10 km per hour?
*November 24, 2012*

**Math**

Yes Steve I did @ first get 2.66 can u help me?
*November 24, 2012*

**Math**

I got 2 hrs and 40 mins approximately right?
*November 24, 2012*

**Math**

So I just round it ? Yep thanks
*November 24, 2012*

**Math**

Btw related to the question I asked: how long would it take him to return to his starting point in a direct line if he can run at 10 km per hour?
*November 24, 2012*

**Math**

Thank you so much ! :D
*November 24, 2012*

**Math **

A runner is 22 km east and 15 km south of his starting point. How far is he in a direct line from his starting point?
*November 24, 2012*

**Physics**

A 1.9 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.13 m, and the height of the room is 3.00 m. (a) What is the gravitational potential energy associated with the ball relative to the ceiling? J (b) What is the ...
*November 21, 2012*

**Physics**

An object with a weight of 30 newtons is placed on a flat, level surface. What is the normal force that the surface pushes on the object with?
*November 14, 2012*

**Math**

Another way to write 44n would be 44 x n because you are multiplying 44 by n, not dividing them.
*November 14, 2012*

**Fractions**

I'm pretty sure it would have traveled 18.5 miles. Try drawing it out on a graph (7.5 down, 3.5 right, etc.). Then add up all the distances it traveled right up to where it reaches a position where it already went. Hope this makes sense.
*November 14, 2012*

**Math- Calculus**

Locate the absolute extrema of the function on the closed interval: y= 4/x+tan(pix/8), [1,2]
*November 8, 2012*

**Math**

First you have to find the derivative of g(x). Then set that equal to 0 and solve for the value(s) of x. Then plug your critical #'s into the original equation. The largest # will be your relative max and the smallest # will be the relative min.
*November 8, 2012*

**Statistics **

Let’s suppose a randomly selected sample of 75 American teenagers watches an average of 1472 hours of television per year with a standard deviation of 250 hours. Construct the 95% confidence interval (CI) for the mean number of hours American teenagers watch television ...
*November 7, 2012*

**MATH**

mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU
*November 6, 2012*

**MATH**

mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU
*November 6, 2012*

**Physics- Projectiles**

A marlin jumps out of the water with an initial velocity of 5.0 meters per second at an angle of 80 degrees above horizontal. Approximately what maximum height will the marlin reach during it's flight?
*October 24, 2012*

**physics**

A person wants to push a lamp (mass 7.2 kg) across the floor, for which the coefficient of friction is 0.23. Calculate the maximum height above the floor at which the person can push the lamp so that it slides rather than tips (Fig. 9-62).
*October 21, 2012*

**AP Chemistry**

Consider the following reaction. CaSO4(s) Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction. (a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium concentrations of ...
*October 20, 2012*

**physics**

a place kicker must kick a football from a point 32.0 m from the goal. As a resultof the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.0 m/s at an angle of 53 degrees to the horizontal. To determine if ...
*October 8, 2012*

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