Sunday

February 1, 2015

February 1, 2015

Total # Posts: 1,269

**chemistry**

Please help what is the molecule CH3CH2CHCHCH3
*January 23, 2015*

**PHYSICS**

A 1250 KG wrecking ball is lifted to a height of 12.7 m above its resting point . When the wrecking ball is released, its swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. A) What is the potential energy of the wrecking ball at a height of 12...
*January 22, 2015*

**Chemistry**

As a purity check for industrial diamonds, a 22 - carat diamond (1 carat = 0.2g) is heated to 63 degrees C and immersed in 26g of water in a constant pressure calorimeter. The initial temperature of the water is 23 degrees C. Calculate the ΔT of the water and of the ...
*January 12, 2015*

**Chemistry**

2C2H2(g) + 3O2(g) 4CO(g) + 2H2O(g) What is delta G° for this reaction in J/mol? (T = 298.17 K)
*January 12, 2015*

**Chemistry**

Calculate the heat transferred when a 23 g of iron nail is cooled from 67oC to 20oC. The specific heat of iron is 0.45 J/goC.
*January 12, 2015*

**Chemistry **

A skillet made of Iron (Fe) weighing 1.8 kg is heated on a stove to a temperature of 202 degrees C. If the skillet is removed from the stove and allowed to cool to room temperature (21 degrees C), how much heat must be removed from the skillet. The specific heat of Iron is 0....
*January 12, 2015*

**Chemistry**

A current of 4.00 A is passed through a solution of AgNO3 for 1.00 hr. What mass of silver is deposited at the cathode? (In grams) Use Faraday's constant F = 9.65x10^4 C/mol
*January 11, 2015*

**Chemistry**

How long (in seconds) does it take to deposit 1.065e+001 g Zn on a steel gate when 2.375e+001 A are passed through a ZnSO4 solution?
*January 11, 2015*

**Physics**

A high fountain of water is located at the center of a circular pool as shown in the figure below. Not wishing to get his feet wet, a student walks around the pool and measures its circumference to be 18.0 m. Next, the student stands at the edge of the pool and uses a ...
*January 5, 2015*

**Science **

Assume that you have 15ml of 2.5M potassium hydroxide but only have concentrated bottle of 16M strength. How would you obtain this
*December 17, 2014*

**algebra**

a train travels 600 miles from Los Angles to San Francisco traveling at a certain speed the return trip is made traveling 40 mph faster the return time is 4 less how fast was the train traveling in each direction?
*October 19, 2014*

**Calculus**

Solve the following e^-x (square root((3e^2x) - 5/4)) = e^x
*September 29, 2014*

**physics**

A football is kicked off with an initial speed of 65 ft/s at a projection angle of 45 degrees. A receiver on the goal line 63 yd away in the direction of the kick starts running to meet the ball at that instant. What must be his minimum speed (in feet/second) if he is to catch...
*September 28, 2014*

**math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 24, 2014*

**AP Chemistry**

Form 300 mL of 0.25 M Copper 2 sulfate pentahydrate
*September 17, 2014*

**Math**

A waiter made $120 in tips after waiting on 6 tables. What was the waiter's average tip per table?
*September 12, 2014*

**Physics**

A commuter backs her car out of her garage with a constant acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 1.60 m/s? s (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration? m/s2
*September 10, 2014*

**english**

Which one of the following sentences includes a prepositional phrase? B. Terry and Rowena met Craig at the mall.
*August 19, 2014*

**History**

If you goto chapter 20 you can see how the lighter skinned Rosa and Jane treat Topsy and talk about darker slaves in general.
*July 19, 2014*

**math**

80% of the American population likes pizza. If 8 Americans are chosen at random, find the probability that 6 of them like pizza.
*June 28, 2014*

**scienc**

Mass of a bick
*June 8, 2014*

**physics**

With a magnetic field perpendicular to a single 13.2 cm diameter circular loop of copper wire decreases uniformly from .670 T to zero. If the wire is 2.25 mm in diameter how much charge moves past a point in the coil during this operation?
*April 28, 2014*

**Chemistry**

Would x equal .114?
*April 16, 2014*

**Chemistry**

Thank you, but I have one more question. In your solution, wouldn't the equilibrium constant equation be [HI]^2 / [H2][I2] Wouldn't HI be the product and H2 and I2 be the reactants?
*April 16, 2014*

**Chemistry**

An equilibrium mixture in a 10.0 L flask contains 7.0 mol HI(g) and 1.0 mol each of I2(g) and H2(g). If 2.5 mol H2, 5.0 mol I2 and 2.0 mol HI are added to that equilibrium mixture how many moles of each gas will be present when equilibrium is reestablished?
*April 16, 2014*

**PHI 208 Week 3 Reading Quiz**

According to Kant, persons: CORRECT are both A and B. Milton Friedman argues that even if the corporate executive were justified in funding social causes with his/her corporation’s profits, he/she could not achieve the success of such social causes because: CORRECT All ...
*April 6, 2014*

**finance**

A bond that has a $1000 par value (face value) and a contract or coupon interest rate of 11.1%. The bonds have a current market value of $1125 and will mature in 10 years. The firms marginal tax rate is 34%. The cost of capital from this bond debt is what percent? (round to ...
*April 3, 2014*

**Physics**

A toy dart gun has a spring with a spring constant of 315 N/m. An 12 gram dart is loaded in the gun and the spring is compressed a distance of 7.8 cm and then shot into the air. When the dart is 5.8 meters high in the air, what is its speed? If the maximum height the dart can ...
*March 31, 2014*

**math**

If a new home can be constructed for $160,000, what is the opportunity cost of federal defense spending, measured in terms of private housing? (Assume a defense budget of $700 billion.)
*March 23, 2014*

**probability**

We have two fair three-sided dice, indexed by i=1,2. Each die has sides labelled 1, 2, and 3. We roll the two dice independently, one roll for each die. For i=1,2, let the random variable Xi represent the result of the ith die, so that Xi is uniformly distributed over the set...
*February 27, 2014*

**probability**

Given that there were 4 Heads in the first 7 tosses, find the probability that the 2nd Heads occurred at the 4th toss. Give a numerical answer.
*February 27, 2014*

**algebra I**

drop a ball at 30000 feet at 30 feet per second and a ball bounces up at 40 feet per second what height do they meet and what speed
*February 16, 2014*

**Physics**

A car is traveling at 16.0 m/s, and the driver sees a traffic light turn red. After 0.500 s (the reaction time), the driver applies the brakes, and the car decelerates at 8.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first ...
*January 24, 2014*

**Physics**

A uniform beam of weight 245 N, and length L, sticks out from a vertical wall. A lightweight cable connects the end of the beam to the wall, making an angle of 65.0° between the beam and the cable. What is the tension in the cable?
*December 3, 2013*

**Math**

P(x) = (2x^3+x^2-18x-9)/(x^2-x-6) 1.Find any holes in the graph of P(x) 2.Find any horizontal or oblique asymptote 3.Determine where it crosses the horizontal/oblique asymptote (if it does)
*November 29, 2013*

**statistics**

I think I have it...nevermind .94 on z chart =1.55...then multiply 1.55 times error (10) then time 60=75.5?
*November 24, 2013*

**statistics**

Typing speeds among college students are normally distributed with a mean of 60 words, and a standard deviation of 10 words. determine the typing speed that separates the top 6% typists from the rest.
*November 24, 2013*

**Statistics**

142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work …Please help. I am getting .0199 SD =sqt(.28(1-.28)/506 = .0119 so .28 +/- .0119 so I could say that with 95% ...
*November 24, 2013*

**Statistics**

I get it now...I was missing a step too! Thanks Much!
*November 24, 2013*

**Statistics**

you know I am getting .0199 SD =srt(.28(1-.28)/506 = .0119? Please check for me again?
*November 24, 2013*

**Statistics**

so I could say that with 95% confidence, between 24.1% and 31.9% of the entire population could be right?
*November 24, 2013*

**Statistics**

142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work and got .72...don't know what to do with this? Please help.
*November 24, 2013*

**Trigonometry**

a 100 pound box hangs between two ropes T1 and T2 the angle at the top of T1 is 28 degrees and the angle at the top of T2 is 35 degrees. what does T1 and T2 equal? Must show work
*November 15, 2013*

**Trigonometry**

A box is on a 10 degree incline with 180 pounds of force against the box. What is the weight of the box?
*November 15, 2013*

**Physics - PLEASE HELP**

A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.00 mm. What is the tensile modulus for this rod? 7.50 × 1011 N/m2 8.70 × 1011 N/m2 9.78 × 1011 N/m2 10.2 × 1011 N/m2 10.8 × 1011 N/m2
*November 10, 2013*

**Algebra 2**

In triangle FGH, the measure of angle G is three times that of angle F. The measure of angle H is 20 degrees more that that of angle F. Find the angle measures
*October 10, 2013*

**english**

Can someone check my english essay. 700 words. I have English as 2nd language
*September 20, 2013*

**Chem still confused**

1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
*September 16, 2013*

**Chem wondering how to set it up**

I'm actually still confused by this
*September 16, 2013*

**Chem wondering how to set it up**

1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
*September 16, 2013*

**finance**

A thirty-year U.S. Treasury bond has a 4.0 percent interest rate. In contrast, a ten-year treasury bond has an interest rate of 3.7 percent. If inflation is expected to average 1.5 percentage points over both the next ten years and thirty years, determine the maturity risk ...
*July 28, 2013*

**Physics**

2_2_3 v(x)= (q_0*(L^4-x^4)/(24*L))/(46/4*E_0*pi*R_0^4)
*July 27, 2013*

**Physics**

2_2_1 -q_0*x^3/(6*L) Q2_2_2 23/2*R_0^4*E_0*pi Q2_2_3 -(q_0*x^3/(6*L))/(46/4*E_0*pi*R_0^4) V(x)???? Q2_2_4 -5.82 Q2_2_5 50.9 305.6
*July 27, 2013*

**Physics**

please any one 2_1_1 and 2_2_3 v(x) Thanks!!
*July 27, 2013*

**statistics**

There is a table of AVERAGE monthly temperatures of two different areas of the same city. A scatterplot of the data is made to show that the relationship is linear between the two. If raw data was used instead of the averages to make the scatterplot, the correlation ...
*July 3, 2013*

**MIT 2.01X**

8_2_1 320N/m
*July 3, 2013*

**MIT 2.01X**

Thanks, you have any response?
*July 3, 2013*

**MIT 2.01X**

help please
*July 3, 2013*

**MIT 2.01X**

I'm trying to solve it
*July 3, 2013*

**MIT 2.01X**

HW8_4_1 : Ymax= h/2
*July 3, 2013*

**Mechanics/Physics**

HW 7_2_2 576 -576 281.33 -281.33 HW 7_3_1 -p*x
*June 30, 2013*

**Physics**

A thin massless horizontal pipe rotates about a vertical axis with angular speed ω as shown in the figure. A small bug, located at a distance r from the axis, starts crawling inside the pipe at constant speed v (relative to the pipe). Because of the bug, the motor must ...
*June 18, 2013*

**simplifying**

(3b)^3
*May 25, 2013*

**chemistry**

determine the number of representative particles in each of the following and identify the representative particle: 11.5 mol Ag; 18.0 mol H20; 0.150 mol NaCL.
*May 6, 2013*

**chemistry**

pb I pbcl2 I cl- II cl- I agcl I ag
*May 5, 2013*

**math**

point
*May 2, 2013*

**Algebra**

simplify k+5 _____ 30k _______ 5k-1 _____ 6k
*March 26, 2013*

**math**

At the beginning of a basketball game, the referee tosses the ball vertically into the air. Its height, h, in feet after t seconds is given by h(t) = -16t2 + 24t +5. During what time interval (to the nearest tenth of a second) is the height of the ball greater than 9 feet?
*March 25, 2013*

**Math**

512
*March 24, 2013*

**physics**

1.986
*March 18, 2013*

**statistics**

The mean of nonresidential buildings is 30 years and the standard deviation of the ages of the buildings is 5 years. Determine the probability that a random sample of a group of 50 nonresidential buildings will have a mean age of less than 27.5 years.
*March 17, 2013*

**Physics**

I think we are in the same class, 'cause I'm working on this problem also...
*March 17, 2013*

**Algebra**

The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.
*March 15, 2013*

**Algebra**

1/5x - 3 = 1/2x - 1/5x What's the ?
*March 15, 2013*

**Algebra**

Solve |4y – 3| > 8
*March 14, 2013*

**Algebra**

Solve 0.17y + 0.03(y + 9000) = 870
*March 14, 2013*

**Algebra**

Solve 1/5x - 3 = 1/2x - 1/5x
*March 14, 2013*

**Algebra**

Solve |6 - 4x| < -13
*March 14, 2013*

**Algebra**

The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.
*March 14, 2013*

**PLEASE HELP!!!**

thanks I think I finally figured it out
*March 5, 2013*

**PLEASE HELP!!!**

Jon and Melissa agree to meet in Chicago for the weekend. Jon travels 236 miles in the same time that Melissa travels 224 miles. If Jons rate of travel is 3 mph more than Melissas, and they travel the same length of time, at what speed does Jon travel?
*March 5, 2013*

**Algebra**

Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
*March 5, 2013*

**Algebra**

A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
*March 5, 2013*

**Algebra**

Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
*March 5, 2013*

**Algebra**

Soybean meal is 16% protein; cornmeal is 8% protein. How many pounds of each should be mixed together in order to get 320-lb mixture that is 10% protein?
*March 5, 2013*

**Algebra**

Joan Arlington has twice as much money invested at 5% simple annual interest as she does at 4%. If her yearly income from the two investments is $378, how much does she have at each rate?
*March 5, 2013*

**Algebra**

Two of the top-grossing concert tours were by a jazz band and a rock band. Together the two tours visited 178 cities. The jazz band visited 92 cities more than the rock band. How many cities did each group visit?
*March 5, 2013*

**Algebra**

Suppose that x liters of 40% acid solution are mixed with y liters of a 43% solution to obtain 100 L of a 41% solution. One equation in a system for solving this problem is x + y = 100. What is the other equation?
*March 5, 2013*

**Algebra**

Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
*March 5, 2013*

**Algebra**

The two largest oil spills together released 286 million gallons of oil into the oceans. The smaller of the two released 58 million gallons less than the larger of the two. How many million gallons did the larger one release?
*March 5, 2013*

**Algebra**

In a recent school board election, the two candidates for president received 2590 votes. The loser received 1302 fewer votes than the winner. How many votes did the winner receive?
*March 5, 2013*

**Algebra**

Mrs. Boyd has a desk full of quarters and nickels. If she has a total of 31 coins with a total face value of $4.55, how many of the coins are nickels?
*March 5, 2013*

**algebra**

Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.70. The fixed cost to run the grinding machine is $267 per day. If the company sells the reground platens for $4.70, how many must be reground daily to break even?
*March 5, 2013*

**Chemistry**

For second Part : B,C,D
*February 22, 2013*

**Statistics**

Which of the following is an accurate description of Simpson's paradox? When groups of data are aggregated, an association can get stronger because of a confounding variable. That confounding variable is usually the number of observations in different groups of data. When ...
*February 21, 2013*

**- English**

where winters are long and cold
*February 11, 2013*

**Math**

Which isn't equivalent: 3/7, 6/14, 8/21 or 12/28
*January 27, 2013*

**science**

How can you group paracrine, endocrine, and neurotransmitter into two groups? (3 different ways to condense them)
*January 14, 2013*

**CHEMISTRY**

The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.
*January 11, 2013*

**chemistry**

The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern of aluminum is measured in a diffractometer with Fe Kα radiation. At what angle, θ, do you expect to observe the first reflection of ...
*January 11, 2013*

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