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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. 8,182 views
prove that cos 52 + cos 68 + cos172 = 0
1. 2 answers
2. asked by Anonymous
3. 4,396 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. 4,245 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. 3,639 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. 3,223 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. 3,010 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. 2,792 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. 2,623 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. 2,540 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. 2,481 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. 2,432 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. 2,368 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. 2,270 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. 2,268 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. 2,259 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. 2,245 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. 2,234 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. 1,954 views
in what direction should a force be applied to produce maximum torque.?
1. 1 answer
2. asked by claudia
3. 1,918 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. 1,902 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. 1,866 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. 1,848 views
How many moles of O2 are needed to react with 2.90 moles C2H2
1. 1 answer
2. asked by Nic
3. 1,809 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. 1,788 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. 1,776 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. 1,748 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. 1,746 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. 1,731 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. 1,728 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. 1,687 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. 1,679 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. 1,559 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. 1,537 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. 1,523 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. 1,495 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. 1,484 views
CALCULATE THE UNIT COST OF $1.85 FOR 4 KG
1. 2 answers
2. asked by Ted
3. 1,483 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. 1,434 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. 1,434 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. 1,398 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. 1,396 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. 1,396 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. 1,387 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. 1,365 views
Write the condensed ground-stste electron configuration of the transition metal ion Mo3+
1. 1 answer
2. asked by KELLY
3. 1,310 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. 1,300 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. 1,271 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. 1,263 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. 1,240 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. 1,229 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. 1,229 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. 1,190 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. 1,184 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. 1,183 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. 1,183 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. 1,183 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. 1,175 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. 1,161 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. 1,147 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. 1,120 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. 1,106 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. 1,090 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. 1,080 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. 1,075 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. 1,063 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. 1,059 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. 1,059 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. 1,056 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. 1,050 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. 1,036 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. 1,034 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. 1,031 views
What is the largest atom in period 2 of the periodic table?
1. 2 answers
2. asked by TT
3. 1,016 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. 1,002 views
What does charlie realize about himself when he takes the rorschach test on april 22?
1. 1 answer
2. asked by Sadie
3. 1,001 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. 994 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. 980 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. 975 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. 966 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. 958 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. 957 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. 948 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. 945 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. 943 views
find the equation of a line that passes through the origin and point (-3,6)
1. 3 answers
2. asked by Lauren
3. 943 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. 912 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. 905 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. 898 views
what two factors combine to give a person weight on Earth?
1. 0 answers
2. asked by aadkfjldjf
3. 894 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. 891 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. 886 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. 883 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. 875 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. 875 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. 874 views
Can you check these for me.Directions: Find the slope of the line that passes through each pair of points. 1. (3,-8) and (-5,2)
1. 7 answers
2. asked by Karen
3. 868 views
A sample of nitrogen gas (N2) kept in a container of volume 13.3 L and at a temperature of 22.3°C exerts a pressure of 1.1 atm.
1. 1 answer
2. asked by nicole
3. 865 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. 863 views
what did the clergy receive from the lords?
1. 1 answer
2. asked by Anonymous
3. 860 views
A 143-g baseball is dropped from a tree 13.0 m above the ground.With what speed would it hit the ground if air resistance could
1. 1 answer
2. asked by Nikohl
3. 858 views

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