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Questions Asked on October 17, 2010

How much work is required to stop an electron (m= 9.11 * 10^-31 kg) which is moving with a speed of 1.80×10^6 m/s?
1. 2 answers
2. asked by Eden
3. 8,128 views
prove that cos 52 + cos 68 + cos172 = 0
1. 2 answers
2. asked by Anonymous
3. 4,343 views
You have an unknown with an observed melting point of 90-93°C. Is your unknown compound A with a reported melting point of
1. 2 answers
2. asked by Lisa
3. 4,190 views
How would you write the chemical formula for Mercury(I) nitrate.i have Hg(NO3)2 since the charge of nitrate is -2 and Mercury's
1. 3 answers
2. asked by Moi
3. 3,579 views
the enthalpy change when a strong acid is neutralized by base is -56.1 kJ/mol.If 135 ml of .450 M HI at 23.15 C is mixed with
1. 2 answers
2. asked by Jazmin
3. 3,193 views
A block of weight = 25.0 N sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as
1. 1 answer
2. asked by Eden
3. 2,946 views
A tree casts a shadow that is 20 feet long. The angle of elevation from the end of the shadow to the top of tree is 66 degrees.
1. 3 answers
2. asked by marie rose
3. 2,728 views
The following reaction represents the decomposition of hydrogen peroxide:2H2O2 -> O2 (g) + 2H2O (l) How many molecules of water
1. 2 answers
2. asked by Dee
3. 2,573 views
A 25 kg chain initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion. Once the chair is
1. 3 answers
2. asked by Daniel
3. 2,484 views
A mixture of CaCO3 and MgCO3 weighing 7.85 g was reacted with excess HCL. The reactions are CaCO3+2HCL=CaCl2+H2O+CO2 and
1. 3 answers
2. asked by Sue
3. 2,409 views
A coordinate grid is used on the plan of a new housing development. fibre optic cable is being laid with a mico-tunnelling
1. 1 answer
2. asked by Ted
3. 2,378 views
A 0.1943g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe 2+ (aq). The iron solution was
1. 2 answers
2. asked by matt
3. 2,317 views
A 285-kg load is lifted 22.0 m vertically with an acceleration a=0.170 g by a single cable.Determine the tension in the cable.
1. 3 answers
2. asked by Eden
3. 2,217 views
Please answer each of the following questions in paragraph form. You should write one short paragraph for each response. Be sure
1. 3 answers
2. asked by Rosa
3. 2,215 views
A tree casts a shadow that is 20 feet long. The angle of elevation from the end of the shadow to the top of tree is 66 degrees.
1. 5 answers
2. asked by marie rose
3. 2,208 views
what is the present value of 1000 paid at the end of each of the next 100 years if the interest rate is 7% per year
1. 1 answer
2. asked by Tiffany
3. 2,199 views
A 7.0-g bullet is fired into a 1.5-kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the
1. 1 answer
2. asked by john
3. 2,194 views
What is the binary representation of the following hexadecimal number? What are the decimal numbers they represent when
1. 3 answers
2. asked by Drake
3. 1,890 views
in what direction should a force be applied to produce maximum torque.?
1. 1 answer
2. asked by claudia
3. 1,889 views
25. If there are 12 chromosomes in an animal cell in interphase of the cell cycle, what is the diploid number of chromosomes for
1. 2 answers
2. asked by Bee
3. 1,870 views
What is the percentage yield for a reaction if you predict the formation of 21 grams of C6H12 and actually recomvered only 3.8
1. 1 answer
2. asked by Devin
3. 1,812 views
NiF2(aq)+Fe2(SO4)3(aq) ==NiSO4 (aq) + FeF3 (s)balance each of the following chemical equations. Express your answer as a
1. 1 answer
2. asked by Lisa
3. 1,805 views
How many moles of O2 are needed to react with 2.90 moles C2H2
1. 1 answer
2. asked by Nic
3. 1,766 views
staright line y=x-1 meets curvey=x^2-5x-8 at the points A and B. the curve y=p+qx-2x^2 also passes through ponts A and B. what
1. 1 answer
2. asked by tommas
3. 1,737 views
Suppose the yearly rainfall totals for a some city follow a normal distribution, with mean of 18 inches and standard deviation
1. 1 answer
2. asked by Anonymous
3. 1,709 views
The propane fuel(C3H8) used in gas barbecues burns according to the following equation:C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
1. 1 answer
2. asked by amy
3. 1,704 views
the coefficient of starting friction for wood on wood is 0.55. What is the force of friction of a wood block of mass 3.5 kg
1. 1 answer
2. asked by courtney
3. 1,702 views
Mei's salary starts at $16,000 per year with annual raises of $1500. Janet's starting salary is $19,300 with annual raises of
1. 2 answers
2. asked by Anonymous
3. 1,677 views
An airplane is flying 400 km/h west. There is a wind blowing 100 km/h NE. What is the airplane's actual speed and heading?
1. 3 answers
2. asked by lawrence
3. 1,661 views
A student needs to determine by titration with NaOH the precise %KHP in an unknown sample that is thought to contain
1. 4 answers
2. asked by Rosie
3. 1,641 views
Find the values of x and y that make the quadrilateral a parallelogram. Show all your work. a parallelogram is drawn with
1. 0 answers
2. asked by Anonymous
3. 1,641 views
If you had a fraction strip folded into twelfths, what fractional lengths could you measure with the strip?
1. 4 answers
2. asked by Kerstyn Purkey
3. 1,528 views
Three numbers between 70 and 80 are prime numbers.what numbers are they? Explain how you know they are prime numbers.
1. 3 answers
2. asked by Trish
3. 1,487 views
A car mass of 1330 kg is traveling at 28.0 m/s. The driver applies the brakes to bring the car to a rest over a distance of 79.0
1. 4 answers
2. asked by Emma
3. 1,475 views
CALCULATE THE UNIT COST OF $1.85 FOR 4 KG
1. 2 answers
2. asked by Ted
3. 1,447 views
Chemistry equilibrium?Consider the reaction 2NO(g) + O2(g) = 2NO2(g) at 430C an equilibrium mixture consists of 0.020 mole of
1. 1 answer
2. asked by Ashley
3. 1,444 views
A car travels due east with a speed of 60.0 km/h. Rain is falling vertically with respect to the Earth. The traces of the rain
1. 4 answers
2. asked by Kristen
3. 1,441 views
A motorcycle stunt rider must jump a 100m wide canyon given a 20° ramp positioned on either side. What minimum speed is
1. 2 answers
2. asked by erin
3. 1,408 views
A company's records indicate that on any given day, 1% of their day shiftemployees and 2% of the night shift employees will miss
1. 1 answer
2. asked by lisa
3. 1,383 views
Mercury and bormine react with each other to produce mercury(II)bromide:Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced
1. 1 answer
2. asked by Katie
3. 1,362 views
The equation for the reaction between hydrogen gas and oxygen gas is:2H2(g) + O2(g) ---> 2H2O(l) i) How much hydrogen will react
1. 1 answer
2. asked by paul
3. 1,342 views
A 26 bullet strikes and becomes embedded in a 1.35 block of wood placed on a horizontal surface just in front of the gun. If the
1. 1 answer
2. asked by Brittanie
3. 1,336 views
1) Minimize versus minimise. Which is UK English & which is US English?2) After cleaning, all waste must be properly disposed
1. 1 answer
2. asked by ann
3. 1,329 views
In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has
1. 1 answer
2. asked by ann
3. 1,323 views
Write the condensed ground-stste electron configuration of the transition metal ion Mo3+
1. 1 answer
2. asked by KELLY
3. 1,267 views
A 1300 sports car accelerates from rest to 90 in 6.5 .What is the average power delivered by the engine?
1. 1 answer
2. asked by Nikohl
3. 1,256 views
When using the Born-Haber Cycle for Na2S, do I double the ionization energy of Na since there are two Na ions for every S ion in
1. 0 answers
2. asked by Becca
3. 1,227 views
A uniform solid sphere of mass M and radius R is rolling without sliding along a level plane with a speed v = 2.70 m/s when it
1. 2 answers
2. asked by Donny
3. 1,223 views
The lengths of the sides of a triangle are consecutive even integers. Find the length of the longest side if it is 22 units
1. 1 answer
2. asked by Anonymous
3. 1,205 views
a book slides off a table top with a speed of 18 meters per second. it strikes the floor in 0.52 seconds how tall was the table
1. 1 answer
2. asked by Ibis Ley
3. 1,186 views
Approximately 40% of all U.S. households own at least one dog (according to the humane society). Suppose 15 households are
1. 1 answer
2. asked by Anonymous
3. 1,164 views
E. Coli outbreak. Outbreaks of E. coli have occurred at a rate of 2.5 per 100,000. Assume this rate represents the mean for the
1. 0 answers
2. asked by Anonymous
3. 1,148 views
Hi I just wanted to verify a few answers to chem questions I'm working on. Was wondering if anyone could help?1. Calculate the
1. 1 answer
2. asked by Andre
3. 1,142 views
What does this mean?It was still raining the morning when Mama told me. Mama was crying, and the rain made it seem as if the
1. 1 answer
2. asked by heather
3. 1,134 views
what is used to knead dough and to roll pastry ?what is used to cook some less tender meats,to steam puddings and to asselerate
1. 9 answers
2. asked by Rose
3. 1,129 views
solve the simultaneous equations to find the coordinates of the point of intersection for the pair of lines of the simultaneous
1. 2 answers
2. asked by Lauren
3. 1,125 views
Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.25 kg is released from A. It makes a head on
1. 2 answers
2. asked by sam
3. 1,122 views
This questions is from Chapter 5, #54) Write a program to compute tips for services rendered. The program should request th
1. 4 answers
2. asked by Lee
3. 1,119 views
A spring-loaded toy gun is used to shoot a ball of mass m=1.5 kg straight up in the air. The spring has spring constant k=667
1. 0 answers
2. asked by Nikohl
3. 1,093 views
I am writing a paper about the affect of political and technical aspects of planning and evaluation on a senior center. Can
1. 1 answer
2. asked by Mary
3. 1,069 views
A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration
1. 3 answers
2. asked by Maria
3. 1,050 views
Find the intersection of the line through (0, 1) and (4.4, 2) and the line through (1.9, 3) and (5.3, 0). (Round your answers to
1. 1 answer
2. asked by liz
3. 1,037 views
Urban Community College is planning to offer courses in Finite Math, Applied Calculus, and Computer Methods. Each section of
1. 0 answers
2. asked by liz
3. 1,033 views
if cosA is 5/13 and tangent Ais 5/12 how do i find the sine
1. 1 answer
2. asked by hillary
3. 1,028 views
This is my problem:A carpenter is building a rectangular room with a fixed perimeter of 336 ft. What dimensions would yield the
1. 3 answers
2. asked by Lee
3. 1,027 views
how to do the calculation while taking 'A'as 15 in the half angle formula used for calculating the value of sin 7.5 ?
1. 1 answer
2. asked by Anonymous
3. 1,022 views
Question:Meg wants to install square tiles in a rectangular room. How can identifying common factors help her decide if any
1. 4 answers
2. asked by Pratigya
3. 1,016 views
for english class i have to write a poem personifying something. I chose to personify a picture in a picture frame. I am not at
1. 3 answers
2. asked by claire
3. 1,001 views
A block of weight = 25.0 sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as
1. 1 answer
2. asked by Nikohl
3. 1,000 views
Intensive Care. The number X of people entering the intensive care unit at a particular hospital on any one day has a Poisson
1. 0 answers
2. asked by Anonymous
3. 990 views
For my essay I have to pick a county in Georgia and collect information about it's demographics and stuff. Then I have to do the
1. 4 answers
2. asked by y912f
3. 982 views
What is the largest atom in period 2 of the periodic table?
1. 2 answers
2. asked by TT
3. 981 views
A 506 g block is released from rest at height h0 above a vertical spring with spring constant k = 500 N/m and negligible mass.
1. 4 answers
2. asked by VitaX
3. 974 views
What does charlie realize about himself when he takes the rorschach test on april 22?
1. 1 answer
2. asked by Sadie
3. 968 views
If 5.86g of glucose are reacted and 1.44L of CO2 gas are collected at 293K and .984atm. What is the percent yield of the
1. 2 answers
2. asked by Andrea
3. 961 views
The Scarlet Letter- How does the reverend Mr. Wilson interpret the baby's response to Dimmesdale's entreaty? What significance
1. 0 answers
2. asked by Andi
3. 958 views
A these statement about the goals of the labor movement in the 1800's and the barriors to achieving these goals
1. 1 answer
2. asked by Sam
3. 948 views
the word equation for sodium and water is:sodium+water-->sodium hydroxide+hydrogen sodium and chlorine: sodium+chlorine-->sodium
1. 0 answers
2. asked by chelsea
3. 927 views
Between 20 and 28 students signed up for the chess club. The students could not be divided exactly into groups of 2, 3, 4 and 5.
1. 1 answer
2. asked by Trish
3. 925 views
A car launches itself off a 20° ramp at the top of a 25m cliff travelling at 35 m/s. How long will it be in the air for and how
1. 1 answer
2. asked by taylor
3. 916 views
a tree casts a shadow that is 20 feet long. the angle of elevation from the end of the shadow to the top of the tree is 66
1. 1 answer
2. asked by marie
3. 909 views
How many grams of KCl would be formed in the reaction of 3.000 g of K2CO3 and HCl?
1. 1 answer
2. asked by Amber
3. 905 views
find the equation of a line that passes through the origin and point (-3,6)
1. 3 answers
2. asked by Lauren
3. 902 views
A 0.720 kg snowball is fired from a cliff 8.10 m high. The snowball's initial velocity is 14.2 m/s, directed 30.0° above the
1. 2 answers
2. asked by VitaX
3. 895 views
The equation for the reaction between hydrogen gas and oxygen gas is:2H2(g) + O2(g) ---> 2H2O(l) i) How much hydrogen will react
1. 1 answer
2. asked by paul
3. 887 views
what two factors combine to give a person weight on Earth?
1. 0 answers
2. asked by aadkfjldjf
3. 873 views
I'd like to know if the following sentences (+alternatives) in indirect speech are possible. Thank you very much in advance.1)
1. 1 answer
2. asked by Franco
3. 867 views
for a particular sample of 77 scores on a psychology exam, the following results were obtained:first quartile=44, third
1. 1 answer
2. asked by mary- please show correct calculations
3. 856 views
please could i say a huge thankyou you have helped me alot and i appreciate it thankyou again you are a star!:]
1. 1 answer
2. asked by kellie
3. 854 views
Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy.y sec(x) =
1. 1 answer
2. asked by Katie
3. 852 views
what did the clergy receive from the lords?
1. 1 answer
2. asked by Anonymous
3. 837 views
a soccer ball is kicked with an initial velocity of 5.0 m/s^2 in a direction of 30 degrees above the horizontala. what are the
1. 2 answers
2. asked by elana
3. 831 views
Which of the following gases will occupy the smallest volume at 300 K and 760 torr and why?80 g diatomic oxygen 80 g methane 80
1. 5 answers
2. asked by susan
3. 830 views
A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration
1. 1 answer
2. asked by Cindy
3. 828 views
Please help me with these: (I finally finished English 2, and am about to get halfway through this!)4. Prohibitionists and
1. 3 answers
2. asked by mysterychicken
3. 823 views
• Consider each of the following scenarios and explain whether the variable in question is a confounder:a. A study of the
1. 4 answers
2. asked by Joe
3. 823 views
What are the exact chemicals found in raw ground beef?
1. 0 answers
2. asked by AL 92
3. 821 views
HOW WILL YOU EVALUATE YOUR PROGRESS? WHAT WILL HELP KEEP YOU MOTIVATED TOWARD ACHIEVING THOSE GOALS?
1. 1 answer
2. asked by claudette
3. 819 views
I need help on a homework problem. "Determine a vector equation for the line perpendicular to 4x-3y=17 and through point (-2,4).
1. 0 answers
2. asked by Kate
3. 817 views
Here were two tricky questions. Please provide steps. Answers are not necessary (since these are practice questions for an
1. 2 answers
2. asked by jo
3. 816 views

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