Monday

September 1, 2014

September 1, 2014

Total # Posts: 69,978

**Chemistry**

What is the molality of the solution that results when 33.3g of C2H5OH are added to 76.7g of water?
*May 2, 2014*

**Chemistry**

liters *
*May 2, 2014*

**Chemistry**

How many litters of Oxygen will be required to burn 3.8 liters of propane, C3H8?
*May 2, 2014*

**Math**

500 pounds of apples were purchased at $0.35 per pound. The desired markup is 30% based on selling price, but 18% spoilage is expected. What should the selling price per pound be?
*May 2, 2014*

**Math**

Find the percent markup based on selling price, if the percent markup based on the cost is 14%. (Round to the nearest tenth percent.)
*May 2, 2014*

**Science**

How do sound waves travel between a boat and a submarine in sonar technology? A. Because of water particles. B. Because of water waves. C. Because of water ripples. D. Because of water currents. B?
*May 2, 2014*

**science**

Discuss the relationship between the size and weight of an object and the amount of friction that is present. Sports such as soccer involving running, stopping, jumping, and kicking. Discuss how friction helps players. Please help, I am stuck and confused.
*May 1, 2014*

**Chemistry- is this correct?**

50.0 ml of .30 KOH are required to titrate 60.0 ml of H2SO4. What is the M of the H2SO4? Is .13 correct?
*May 1, 2014*

**chemistry**

For which salt, K2SO4, Li2SO4, KClO4, or NH4Cl, will increasing the temperature of the water have the greatest change in solubility per 100 g solvent?
*May 1, 2014*

**chemistry**

what will be the pressure of 0.010m of oxygen gas in a 4.5L flask at a temperature of 10,000C?
*May 1, 2014*

**calculus help**

use the midpoint rule with the given value of n to approximate the integral. round the answer to four decimal places. integral 0 to pi/2 2cos^3(x)dx, n=4 M4=????
*May 1, 2014*

**math**

thanks a lot
*May 1, 2014*

**math**

Amy earned $93 at work yesterday. She gets paid $8 per hour, plus she received a $45 bonus. Write an equation that can be used to determine how many hours Amy worked.
*May 1, 2014*

**Chemistry **

100.0 ml of 0.25 M HCL are required to titrate 65 ml of NaOH. What is the M of the NaOH?
*May 1, 2014*

**math**

Use distributive property to write an expression equivalent to: 10 (5g + 8k)
*May 1, 2014*

**math**

C) 4 The area of the circle is twice the area of the triangle. Fina the area of the triangle and multiply it by two. 1/2(3.14*4)(4)= 25.12 25.12*2= 50.24 50.24 is the area of the circle so.. 50.24= pi(radius^2) 50.24/3.14= 16 The square root of 16= 4
*May 1, 2014*

**math**

thanks
*May 1, 2014*

**math**

Evaluate: 2 to the fourth power + 2 to the third power
*May 1, 2014*

**History8**

its not a i tried that
*May 1, 2014*

**Calculus Help **

Use calculus to find the area A of the triangle with the given vertices. (0, 0), (3, 1), (1, 8) A = ????
*May 1, 2014*

**trig**

A soccer ball is placed 12 ft away from a goal post that measures 8ft high. You kick the ball and it hits the crossbar at the top of the goal. What was the angle of elevation of your kick?
*May 1, 2014*

**math**

thank you
*May 1, 2014*

**math**

It took Aaron 4 hours to drive 232 miles. Use the equation below to determine what his average rate of speed was. D = r x t D = distance, r = rate of speed, t = time
*May 1, 2014*

**science**

B C and D
*May 1, 2014*

**science**

Please help!
*May 1, 2014*

**science**

Which of the following illustrates mechanical weathering? A. Carbonic acid weathers marble limestone B.As plants grow, they produce weak acids that slowly dissolve rock C.Oxidation causes weathering in rock<--- D.Repeated freezing and thawing in rocks causes weathering
*May 1, 2014*

**science**

So D?
*May 1, 2014*

**science**

Actually I think its C
*May 1, 2014*

**science**

Which of these statements about saltwater is correct? Saltwater freezes at a lower temperature Saltwater freezes at a higher temperature<--- Saltwater does not freeze at any temperature. Saltwater’s freezing point depends on the temperature of ocean floor
*May 1, 2014*

**Algebra**

Melissa Stone was just hired as a nurse at a hospital where she will earn $45,000 per year. If she receives a 6% raise each year, how much total money will she earn over the next 10 years?
*May 1, 2014*

**algebra**

(y^2 - y + 2)/(y + 2) I put this in calc101 . com and I got an answer with y - 3 in the quotient and got 8 in thr remainder area. My answer key says the answer is y - 3 + 8/y + 2. Can someone explain how the answer key has this answer?
*May 1, 2014*

**Math**

A truck costing $25,000 with a residual value of $5,000 was purchased by Rim Corporation. The truck’s estimated life is 10 years. At the end of Year 2, what is the book value using declining-balance method? Assume a depreciation rate of twice the straight-line method
*May 1, 2014*

**Help Ms.Sue!!! Social Studies**

Read your lesson again. I had the same questions and the lesson covers these questions well.
*May 1, 2014*

**Math**

. A playground has a total of 18 swings and slides. There are as many swings as there are slides. How many are there of each?
*May 1, 2014*

**Physic**

45π - 19π - 35π = -28.3rad/s 45π - 19π + 35π = 192radrad/s
*May 1, 2014*

**Physic**

Two identical tops spin with angular velocities 45π rad/s up and 19π rad/s down, respectively, about vertical axes on a table. The tops bump into one another and separate. After the collision, one of the tops has an angular velocity of 35π rad/s in its original ...
*May 1, 2014*

**Physic**

Diameter = 1000rev/min ÷ 60s * 2π * 2.9cm ÷ (2π * 31rev/s) Diameter = 1.56cm
*May 1, 2014*

**Physic**

A vacuum pump is connected to its electric motor by a belt drive (Fig. 9-40, not to scale). The motor rotates at a rate of 1000 rev/min and the diameter of the motor shaft is 2.9 cm. How large (diameter) should the pulley be if it is designed for a speed of 31 rev/s? (Answer: ...
*May 1, 2014*

**chemistry**

1.50 mol sample of helium at a certain pressure and temperature has a volume of 31.4 L. a second sample of helium at the same temperature and pressure has a volume of 42.4 L. Therefore the second sample contains how many moles of helium?
*April 30, 2014*

**Math**

Thanks, Reiny I see you answer a lot of questions for people. Thank you for taking the time out to help others that struggle in math. Your help is greatly appreciated
*April 30, 2014*

**math**

-2d + 18 - 4d = 60
*April 30, 2014*

**Physic**

13.9cm / 2 = 6.95cm F(finger) 0.026kg * 9.8m/s^2 * 6.95cm / 3.2cm = 0.553N F(thumb) 0.553N - 0.026kg * 9.8m/s^2 = 0.299N
*April 30, 2014*

**Physic**

You hold a uniform, 26.0-g pen horizontal with your thumb pushing down on one end and your index finger pushing upward 3.2 cm from your thumb. The pen is 13.9 cm long. Find the two forces. Force of Finger (Answer: 0.553N) Force of Thumb (Answer: 0.299N) Answers are provided ...
*April 30, 2014*

**BIOLOGY**

when chlorophyll runs out of electrons where does it find new ones? The light dependent reactions use energy from sunlight to produce what 3 things?
*April 30, 2014*

**Biology help**

what is the name of the process that happens in the matrix of the mitochondrion? What is the name of the process that happens last in cellular respiration and takes place on the inner membrane?
*April 30, 2014*

**HELP!!**

Find the coodrinates of the other endpoint of the segment given (-24,15) is the midpoint and one of the endpoint is (-18,10)
*April 30, 2014*

**Pre algebra**

yes
*April 30, 2014*

**Math Help 2 Questions Urgent!**

actually the Pythagorean theorem is only used to find the length of a missing side of a right triangle, you use the distance formula which is square root (x-x)^2+(y-y)^2
*April 30, 2014*

**consumer math**

true
*April 30, 2014*

**Calculus Help Please Urgent!!!**

Prove that the integral on the interval [a,b] of x is equal (b^2-a^2)/2 integral a to be (x)dx = (b^2-a^2)/2 using the definition of a Definite Integral. This is the limit of a sum approach. show steps please!!! Thank you!!!
*April 30, 2014*

**Math**

(y^2-y+2)/(y+2)
*April 30, 2014*

**math**

thanks
*April 30, 2014*

**math**

Which equation shows the identity property of multiplication? a) 6 x 0 = 6 b) 6 x 4 = 4 x 6 c) (6x2)x4 = 6(2x4) d) 6 x 1 = 6
*April 30, 2014*

**CHEMISTRY HELP !!!!**

how do i get voltage cell????
*April 30, 2014*

**CHEMISTRY HELP !!!!**

I have to use the formula below but I dont know how! :( Delta G = -nFE
*April 30, 2014*

**CHEMISTRY HELP !!!! **

Cell Designation : E (measured) = Sn I Sn^2+ II Cu^2+ I Cu Temp= 3 Celsius Temp= 276.15 Kelvin Delta G= ????? Show work please!!!!
*April 30, 2014*

**CHEMISTRY HELP !!!! **

Pb I Pb^2+ (1M) II Cu^2+ (1M) I Cu Temp.= room temp E cell (measured) = delta (calculated) =??? Keq (calculated) =???? Please show steps so I can do the rest. show calculations for delta G and Keq for an exemplary pair. For Pb I Pb^2+ II Sn^2+ I Sn Thank you!
*April 30, 2014*

**math**

Ben works 6 hours each day at his job at a local fast food restaurant. He went home sick after working 2 hours. what is the fraction of the 6 hour shift did he Not work?
*April 30, 2014*

**Physic**

Child 1 is 2.0 m from the axis of rotation, and child 2 is 1.5 m from the axis. The merry-go-round completes one revolution every 4.8 s. Find the angular speed of each child. (Answer: For both child is 0.278rev/s) Please show all work on how to get the answer.
*April 30, 2014*

**Physic**

A 220 g cart moves on an air track (a one-dimensional system in which motion is friction free) at 1.3 m/s. It collides with and sticks to another cart of mass 550 g, which was moving in the opposite direction at 0.80 m/s before the collision. What is the velocity of the ...
*April 30, 2014*

**statistics**

For hair color, Brown (B) is a dominant trait and Blond (b) is a recessive trait. If one parent has pure blond hair and one parent has hybrid brown hair, complete the Punnett square and questions that follow. a) What is the probability that their first child will have pure ...
*April 30, 2014*

**Math**

(y^2-y+2)/(y+2)
*April 30, 2014*

**Math**

(n^2 – 5n + 4) / (n – 4)
*April 30, 2014*

**statistics**

The mean income per person in the United States is 36,500
*April 30, 2014*

**physics**

A solid uniform sphere is released from the top of an inclined plane .25 m tall. the sphere rolls down the plane without slipping and there is no energy lost from friction. What is the translational speed of the sphere at the bottom of the incline?
*April 30, 2014*

**Science**

a 5 kg skateboard moves at 7 m/s^2 . What is the force of the skateboard? 35 N<--- 12 2 m/s^2
*April 30, 2014*

**language art pllz help**

All correct just got 5/5 100%
*April 30, 2014*

**math**

Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of the ...
*April 30, 2014*

**fizk**

Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of the ...
*April 30, 2014*

**fizk**

3 - A box of mass 2 Kg lies on a rough horizontal floor with the coefficient of friction between the floor and the box being 0.5 (Figure 3). A light string is attached to the box in order to pull the box across the floor. If the tension in the string is TN, find the value that...
*April 30, 2014*

**Help with one limit**

I'm asked to find the limit as n approaches infinity of : [(2^(n) +1]/ [2^(n+1)]. The review we were given has [1+ 2^(-n)] / 2 as the next step, but I'm not quite sure how to make that leap myself. The final answer is 1/2. How do you solve this limit?
*April 30, 2014*

**physics 1**

The drawing shows an intravenous feeding. With the distance shown, nutrient solution (ρ = 1050 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.
*April 30, 2014*

**physics**

Airplane flies at velocity of 400 mph and the wind is blowing north at 200 mph
*April 30, 2014*

**Programming**

Create a full program with proper instructions for the user that asks the person to choose between the following options: Find out if a year a leap year Number of days in a month for any given year Print out the number of days in a year, a leap year, and weeks in a year. After...
*April 29, 2014*

**Science**

a 5 kg skateboard moves at 7 m/s^2 . What is the force of the skateboard? 35 N<--- 12 2 m/s^2
*April 29, 2014*

**algebra**

Write a ratio in simplified form of the area of the shaded figure to the area of the figure which encloses it. I have a square with height 5w and width 5w. Enclosing it are a right triangle on each side, which have a width of 6 and have the square's height (5w) also ...
*April 29, 2014*

**English help**

What are some interesting facts about Nikki Giovanni's writing?
*April 29, 2014*

**Chemistry**

I see my mistake now, thanks!
*April 29, 2014*

**Math**

Math - Cindy, Tuesday, April 29, 2014 at 8:44pm At Bobs diner, it costs $8.00 to purchase two hamburgers and one order of fries. The "family pack" costs 30.00 and comes with six hamburgers and six orders of fries. If the prices are constant,how much does one ...
*April 29, 2014*

**math**

a coding supervisor must determine the number of full-time equivalents (FTEs) needed to code 500 discharges per week. If it takes an average of 20 minutes to code each record and each coder works 7.5 productive hours per day, how many FTEs will the coding supervisor need?
*April 29, 2014*

**Chemistry **

Would it take more 0.1 M HCl or 0.1 M H2SO4 to neutralize 30 ml of NaOH?
*April 29, 2014*

**chemistry**

At 22 degrees Celsius and 729 torr pressure, what will be the volume of 75 mol of NH3 gas?
*April 29, 2014*

**math**

Sara has x ribbons and 4 extra ribbons. Jill has 12 ribbons. Express the number of ribbons that Sara has in terms of x.
*April 29, 2014*

**Math**

Circle Graphs Month | Snowfall | Percent | Angle Measure November | 1 | ? 1% | ? 3.6 December | 4 | ? 4% | ? 14.4 January | 5 | ? 5% | ? 18 February | 2 | ? 2% | ? 7.2 How would I make a circle graph? Or did I do something wrong? The month and snowfall were given and I found ...
*April 29, 2014*

**math**

thanks, both of you
*April 29, 2014*

**math**

You are buying tickets for rides at a carnival. Tickets cost $2 each. You want to spend no more than $30 on tickets. Write an inequality to represent this situation.
*April 29, 2014*

**math**

thank you
*April 29, 2014*

**math**

Simplify by combining like terms. 9m + 5m - 4
*April 29, 2014*

**math**

Can 3t^2+5t-2 be factored?
*April 29, 2014*

**algebra 1**

The Ricco family filled the gasoline tank of their car at the beginning of a long trip. Their car used gasoline at the rate of 1 gallon every 21 miles. When they stopped for lunch, they had driven 315 miles, and there were 9 gallons of gasoline left in the tank. How many ...
*April 29, 2014*

**Govt college of technology**

A wheel rotates at 200rev/min.if the radius is 4in through what total distance does a point on the rim travel in 20min
*April 29, 2014*

**Science**

What is the force that results from a 3,000 kg car accelerating at 20.00 m/s^2
*April 29, 2014*

**algebra 1**

Mrs. Hernandez owns a computer training business. She charges a lab fee plus an hourly fee to train office workers on various software programs. It costs $265.00 to attend a 6-hour course and $345.00 for an 8-hour course. Which equation relates x, the number of hours in the ...
*April 29, 2014*

**Science**

Am I right?
*April 29, 2014*

**Science**

Which of the following would have the greatest force? an object with low mass accelerating slowly an object with low mass accelerating quickly an object with high mass accelerating quickly<--- an object with high mass accelerating slowly
*April 29, 2014*

**Cheměstry**

The following two solutions were combined and mixed well: 150.00 mL of a 3.500 M iron(¡¡¡) nitrate solution and 760.00mL of a 1.600M magnesium nitrate solution. 20.00mL of the final solution was transferred with a pipette into an empty 250.00mL volumetric ...
*April 29, 2014*

**physics**

A 1500-kg car coast in neutral down a 2.0degrees hill. The car attains a terminal speed of 20.0 m/s. The question is:how much power must the engine deliver to drive the car on a level road at 20.0 m/s?? Help me out please!!
*April 29, 2014*

**Statistic in Social Science**

4. The verbal part of the Graduate Record Exam (GRE) has a ƒÝ of 500 and ƒã = 100. Use the normal distribution to answer the following questions: a. If you wanted to select only students at or above the 90th percentile, what verbal GRE score would you ...
*April 29, 2014*

**aptitude**

Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests $3,500 and Z invests $2,000. If the profits are $1,500, how much less does X receive than if the profits were divided in proportion to the amount invested?
*April 29, 2014*

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