Total # Posts: 103
Ive tried numerous methods, but I cant seem to get this right. Please help, and explain step by step. An object's position is given by x=bt+ct^3, where b=1.50m/s and c=0.640m/s3. To study the limiting process leading to the instantaneous velocity, calculate the object'...
January 14, 2016
I have a 0.00156 M solution of CuSO4*5H2O in water (from 0.0398 g of CuSO4*5H20 in 100 mL of water). How would I calculate the ppm of Cu of that solution from that information? Now if I were to find ppm of Cu in different aliquots of this stock solution (5 mL, 10 mL, etc.) how...
November 16, 2015
I have a 0.00156 M solution of CuSO4*5H2O in water (from 0.0398 g of CuSO4*5H20 in 100 mL of water). How would I calculate the ppm of Cu of that solution from that information?
November 15, 2015
A bowl contains 10 red balls, 5 blue balls, and 8 green balls. A woman selects balls at random without looking in the bowl. How many balls must she select to be sure that she has at least one ball of each color?
November 14, 2015
The school bus slows from 60km/h to 40km/h when entering the scholl zone. a. Calculate the conversation of these speeds from km/h to m/s. b. Given that this change of speed occured over 8 seconds, calculate the average deceleration of the bus. My work... a.60/3.6=17m/s 40/3.6=...
November 9, 2015
Write a balanced net ionic reaction for the reduction of cupric ion (Cu2+) by hydroxylamine (NH2OH) in acid solution, using the smallest integer coefficients. Im not too sure of what is reacting here to reduce the Cu2+. Help?
October 21, 2015
A 10.0 mL aliquot of a flouride sample solution was diluted to 250 mL in a volumetric flask. The F- concentration of this DILUTED sample was determined with a F- ion selective electrode and found to be 7.1 mg/L. What is the concentration of F- in the original, undiluted sample...
October 19, 2015
I need a balanced chemical equation for the titration of potassium iodate (KIO3^2-) and sodium thiosulfate (Na2S2O3^2-). This is what I have, but I was wondering if I should cancel the spectator ions: Na2S2O3 (aq) + 2KIO3 (aq) --> K2S2O3 (aq) + 2NaIO3(aq)
October 5, 2015
Its some randomly generated question in preparation for a lab with normal sized vol. flasks. But yes, I agree, that would be a bit awkward to have a 4.0 mL flask. Haha Can explain the unit conversions in the 75 x 4/1000 you posted?
October 1, 2015
Caluculate the mass of ferrous ammonium sulfate (Fe(NH4)2(SO4)2.6H2O) you would need to add to a 4.0 mL volumetric flask to make a solution that is 75 ppm. I've already identified that Fe is 14.24% of the Mohr's salt, but how would the conversion of that go to ppm? Ppm...
October 1, 2015
A 2.00 kg box slides down a rough incline plane from a height h of 1.99 m. The box had a speed of 2.77 m/s at the top and a speed of 2.34 m/s at the bottom. Calculate the mechanical energy lost due to friction (as heat, etc.) If I were to calculate the energy lost, it would be...
September 30, 2015
Science, HELP!!! URGENT!
a) If the silty clay loam soil profile is 1 meter deep, how much plant available water (cm) can potentially be held in the upper meter of soil? b) If the silty clay loam profile is 40 inches deep, how many inches of plant available water can potentially be held in the upper 40...
October 12, 2014
For the given dimensions, find the area of each figure. If necessary round to the nearest hundredth. 1.Rectangle with base 4m and height 2cm. 2. Square with side length 3.5 in. 3. Circle with diameter 9cm.
July 8, 2013
Do Psychologist adhere to the same code of ethics as a social worker? What is the number 1 ethical concern of a psychologist? What area of malpractice do psychologist face most.
February 18, 2013
In her physics lab, Jessica rolls a 11-g marble down a ramp and off the table with a horizontal velocity of 1.38 m/s. The marble falls in a cup placed 0.45 m from the table's edge. Find the table's height.
February 6, 2013
as the weight held by a spring increases, the length of the spring increase proportionally. suppose a 2-lb weight stretches a spring to 15 in., and a 12-lb weight stretches the same spring to 20 in. what is the length of the spring with no weight attached?
April 4, 2012
A sample of the number of study per week of college students is collected. Some of the sample results of the survey are given in the following table Study Hr 4, 10, 20,24, 34, 36, 42 Z score -2.5,-1.75,-0.5,0, 1.25,1.5,2.25 P. Rank 10, 25, 35, 40, 50, 75 95 Q1- The mean study ...
December 21, 2010
Verify that f(x) = x^3 − 2x + 6 satisfies the hypothesis of the Mean-Value Theorem over the interval [-2, 3] and find all values of C that satisfy the conclusion of the theorem.
December 19, 2010
Verify that the hypotheses of the Mean-Value Theorem are satisfied for f(x) = √(16-x^2 ) on the interval [-4,1] and find all values of C in this interval that satisfy the conclusion of the theorem.
November 29, 2010
1. What is the direction of charge flow when charging a capacitor? When discharging a capacitor? What is your evidence? 2. Consider a circuit with a capacitor, battery, wire, and bulb. Describe the source(s) of charge during capacitor discharging. 3. Using the analogy of the ...
October 1, 2010
1. A Marine Weather station reports waves along the shore that are eight seconds apart. The frequency of the waves is therefore ___Hertz. 2. If a mosquisto beats its wings at the average rate of 600, what is the frequency? 3. The period of a 440 Hertz sound wave is ____ seconds.
September 30, 2010
Solve each equation. What am I doing wrong because the answer is suppose to be 11/2 and I don't get the answer. Here's what I'm doing... Problem: 2x+1/4-3x-4/5=1/2 I get: 10x+5-12x-16=10 Which gives me -2x=21 My answer is -21/2 the correct answer is suppose to be 11/2
September 2, 2010
I have been struggling with this problem I cannot get the right answer. Please give me the steps to solve this problem. Let f(x)= (2x-9)(x^2 + 6) (A) Find the equation of the line tangent to the graph of f(x) at x=3 (B) Find the values(s) of x where the tangent line is ...
June 19, 2010
Under less than ideal conditions, a student pushes a 6 kg cart holding 2 boxes of books up a ramp to a platform that is 1.8 m high in 42 sec. Each box contains 12 kg of books. The ramp is inclined at an angle of 15 degrees. He pushes w/ a steady force of 70 N to move it up. ...
April 8, 2010
when 10.0 grams of an unknown substance is dissolved in 50. grams of water, the new freezing point becomes -3.00C. What is the molar mass of the compound? For this question can some one tell me the formulas I need to solve for this problem and I can fill in the rest
March 7, 2010
Assume that at the beginning of 2000 Speedy Delivery a Fed Ex competitor purchased a 737 aircraft at a cost of 60,000,000 Speedy Delivery expects the plane to remain useful for 5 years (5 million miles) and to have a residual value of 5,000,000 Speedy Delivery expects to fly ...
January 5, 2010
Assume that at the beginning of 2000, Quick Travel, a FedEx competitor purchased a used Boeing 737 aircraft at a cost of 60,000,000. Quick Travel expects the plane to remain useful for 5 years (5 million miles) and to have a residual value of 5,000,000. Quick Travel expects to...
January 1, 2010
I continue getting the wrong totals can you please help me solve this problem and give me the correct formula and Journal entries. On Jan 1 2004 Brown Airways purchased an airplane for 34,450,000. Brown airways expect the plane to remain useful for 6 years and have a residual ...
January 1, 2010
Given the following data by how much would taxable incoome change if LIFO is used rather that FIFO Beg Inv. 3500 unit at 60 units sold 8100 Purchases 6500 units at 70
December 30, 2009
I need help to journalize these transactions for accounting. Samantha purchased inventory costing 125,000 and sold 70% of the goods for 162,500 all purchases and sales were on account She later collected 25% of the accounts receivable Which is the perpetual inventory system ...
December 30, 2009
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? Is A the correct answer? a) That there is no reaction force-the net force on the object is zero, so the ...
November 23, 2009
Is it true that when a baseball player hits a home run, the baseball receives a greater impulse from the bat than the bat does from the ball? My thinking is that everything should be equal so I would answer this question false-am I correct?
November 23, 2009
Two vehicles with the same mass collide and lock together traveling 28 m/s at 37 degrees north of east after the collision. How fast was the car traveling that was heading north while the other vehicle was traveling east?
November 23, 2009
A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of ...
November 7, 2009
Please write a 300 to 350 word response explaining how the threat of punishment either does or does not deter juvenile delinquency. Provide examples of general deterrence, specific deterrence, and situational crime prevention strategies. Additionally, identify which concept or...
May 6, 2009
For the following equilibrium process: CO2 + H2 = CO + H2O The equilibrium concentrations of reacting species are: [CO]= .050 M; [H2]= .045 M; [CO2]= .086 M; [H2O]= .040 M. (a) Calculate Kc for the reaction (b) If we add CO2 to increase its concentration to 0.50 mol/L, what ...
August 16, 2008
Not exactly a question but still considered as homework i need help with. Thanks in advance for answering if you do, its a great help. Ive been given a task to survey people about excercise and fitness. The answers dont have to be long but please atleast write a sentence for ...
July 1, 2008
A maker has the opportunity to purchase several acres of land that is divided up into several lots for building single-family homes. It is known that the average sale price of all of the lots is $80,000 and the standard deviation of the sale price is $12,000. What can you say ...
May 16, 2008
Elizabeth Fernea is a Euro-American, (upper) middle class woman accompanying her anthropologist husband to a very foreign setting in the mid-1950s. What have you learned so far about some of the differences between the ways people live in Iraq and the way you live? What do you...
June 11, 2007