Sunday
December 21, 2014

Posts by jenny


Total # Posts: 1,256

physics
need help can someone please tell me Electricity is often converted into other forms of energy. List 3 examples.
January 5, 2012

7th physics
baloonist drops rock from balloon. takes 7 seconds for the rock to fall. what's the balloonist's altitude in feet?
January 5, 2012

Math
Tomas put $180 in an account earning simple interest. At the end of one year, the account had $186.30 in it. Assuming no additional deposits or withdrawals, what was the interest rate being paid? I really need help!
January 3, 2012

math
That is easy. Now put 0.75 in a fraction and redouce it: 75/100= 3/4 Than 0.2: 2/10= 1/5 8/10= 4/5 Now they are all fractions. so it should be this: 3/4,1/5,4/5.
January 3, 2012

chemistry
b. Methanol, CH3OH, which can be used as a fuel, can be formed by the reaction between carbon monoxide and hydrogen as depicted in the following balanced equation. 2H2 + CO ¨ CH3OH Suppose 356 g of CO and 65 g of H2 are mixed and allowed to react. (i) Which species ...
December 28, 2011

physics
thanks alot :D i got 3s for t for part 2!! nd i got 17.1s for part1 is dat correct??
December 22, 2011

physics
Driving in a car with a constant velocity of 11.4 m/s you suddenly see an obstacle ahead. Immediately applying the brakes the car slows with an acceleration of 3.80 m/s2. (i) Calculate the stopping distance of the car, and (ii) the time taken to stop.
December 22, 2011

chemistry
n=m divided by mr n=25 divided by mr of nacl 23+35.5 n=c*v
December 13, 2011

chemistry
can you find them for me
December 13, 2011

chemistry
yeas it is a mean mass ratio could you show me how to do it Bob Pursley
December 13, 2011

chemistry
Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 . What volume of compound D is to be added? ''DR BOB 222 IT IS A GRAMS RATIO'...
December 13, 2011

chemistry
The ratio of 4:1 by moles DrBob222
December 8, 2011

chemistry
moles please show me the steps on how to do it thanks
December 8, 2011

chemistry
please help
December 8, 2011

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1. What volume of compound D is to be added?
December 8, 2011

chemistry
5. Compound A has a MW of 283. 0.423g of Compound A is dissolved in 13.5mL of water and 1mL of the solution added to 5mL of water to produce “solution A”. What is the concentration of Compound A in “solution A”?
December 8, 2011

chemistry
4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...
December 8, 2011

chemistry
4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...
December 8, 2011

chemistry
1. NaOH has a MW of 40. A 0.12M solution is made by adding how much NaOH to 100mL of water?
December 8, 2011

chemistry
2. 2mL of a 10M solution of Compound A is taken and 48mL added. 1mL of this solution is then taken and dried to dryness before being re-dissolved in 0.1mL. What is the concentration of the 0.1mL solution?
December 8, 2011

chemistry
Thank you
December 8, 2011

chemistry
please show me how to do it DrBob222
December 8, 2011

chemistry
I don't know what is it
December 8, 2011

chemistry
3. Compound A is provided as a 500mM solution. If 12.5 mL is taken and added to 12.5mL of water, how many moles (or millimoles / micromoles) are there per 0.1mL of the diluted solution?
December 8, 2011

calculus
An object moves in such a manner that its velocity at time t is given by v(t) = t3 - 4t2 + 3t At t = 0, it starts at position x = 0. During the interval [0, 4] what is the net distance moved?
December 1, 2011

Social Studies
What are the three countries that have influenced Canadian culture and history?
November 29, 2011

algebra
what is in the exact middle of $5.50 and $5.75?
November 27, 2011

physics
OMG !! i was suck on this question for like a billion years !! and i still havent gotten the answer!:(
November 3, 2011

Psychology
John Bowlby, a British psychoanalyst, drew attention to the importance of attachment
October 25, 2011

Psychology
This passage is mostly about
October 25, 2011

Psychology
In this passage, the word dire means
October 25, 2011

Math
Write a function rule for the area A(n) of a square when you know length n of a side?
October 23, 2011

bio lit
Concrete Poem on a cell
October 17, 2011

Bio lit
limerick on cell
October 17, 2011

Bio Lit
Haiku on a Cell
October 17, 2011

american history
who won the election of 1920 and what was his promise to the nation?
October 17, 2011

physics
a sprinter exerts 850N on the starting blocks at 25 degrees to the horizon at the beginning of a race. what is the vertical force exerted at the blocks?
October 15, 2011

physics
a sprinter exerts 850N on the starting blocks at 25 degrees to the horizon at the beginning of a race. what is the vertical force exerted at the blocks?
October 15, 2011

managerial accounting
. (TCO 4) Paschal’s Parasailing Enterprises has estimated that fixed costs per month are $115,600 and variable cost per dollar of sales is $0.38. This means that the contribution margin ratio is 62 percent. (a) What is the break-even point per month in sales dollars? (b) ...
October 12, 2011

managerial accounting
The building and equipment are estimated to cost $1,100,000 (ignore depreciation). The building and equipment have zero estimated residual value at the end of 10 years. Munster’s required rate of return for this project is 12 percent. Net Cash Flow related to each year of...
October 12, 2011

Math
Your bank account balance is -20.85. you deposit $15.50. What is your new balance?
October 5, 2011

Stoichiometry
Dr.Bob222 is right. Rodney, your answer is wrong. I just did this problem online and the correct answers were the one that Dr.Bob22 gave.
October 4, 2011

physics
Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.
October 3, 2011

science
Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.
October 3, 2011

College Chemistry
I am assuming its a liquid. My question is writing the chemical equation. What is the chemical equation? Is it C6H6 + O2 ---> CO2 + H2O? And if so how do I balance it?
September 25, 2011

College Chemistry
I am going to assume it is a liquid
September 25, 2011

College Chemistry
One liter of benzene (C6H6) is completely burned (oxidized) with air. Write a balanced chemical equation to represent this reaction.
September 25, 2011

Math
Can anyone answer: "R is the set with even natural numbers that are less than 2" in roster and set builder form
September 25, 2011

Math
Is 0 an even natural number?
September 25, 2011

economics
A profit-maximizing firm in a competitive market is currently producing 100 units of output. It has average revenue so $10, average total cost of $8 and fixed cost of $200. a. what is the profit? b. what is the marginal cost? c. what is its average variable cost? d. is the ...
September 20, 2011

accounting
6. Acme Manufacturing Company estimates factory overhead as a percentage of machine hours. On 1.1.11, Acme estimates total factory overhead of $400,000 for the year, and estimates 20,000 machine hours will be required during the year. During the year, 10,000 units of product ...
September 20, 2011

accounting
Bubba Production Company produces a homogenous product. All materials are added at the beginning of production and other product costs are added evenly over time until the product is complete. Conversion costs were 70% complete with respect to the 2,000 units in process July 1...
September 20, 2011

Science
Analyzing Ideas- Why would you weight less on a high mountain than you would at sea level?
September 19, 2011

Math
What percent of 1.5 is 3?
September 14, 2011

Spanish
Also, you would put ¨me gustan los deportes¨, for the same reason (I like sports, not). Te Gustan is ¨do you like sports¨
September 8, 2011

Spanish
¨Cómo te llamas¨ directly translates to ¨what do you call yourself?¨ Me llamo is correct because it means ¨I call (llamo) myself (me) Isabel¨. Te llamas Isabel is ¨you call yourself Isabel¨, while Me llamas Isabel means ¨you call me ...
September 8, 2011

Subjects
Will i get a lot of homework in middle skoo ????? here r my classes Math F.A.C.S. Art Sci English Content Support 7c Gym Social Studies also if i did what to do ???? need tips ???? plzzz answer
September 5, 2011

Subjects
What's Content Support 7c ???? it says it in my schedule i'm going into the 7th grade this week plzzz answer also wat do u do ????? plzz answer plzzz i kno it's a helping class but do you learn the same thing in ur regular class ????? plzzz answer
September 5, 2011

math
TRUE OR FALSE (x+y)+2=2+(x+y) is it associative property? (2*3)*5=(3*2)*5 is it commutative property? (X+3)4=4X+12 is an example of the distributive property of multiplication over addition (10+y)+z= 10 +(y+z) is this associative property?
August 29, 2011

math
-8/3*2=
August 29, 2011

math
Can anyone give me some pointers on how to plot the graph in excel please
August 25, 2011

math
Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of sin -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special tables sin pi/6 = cos pi/3 = 1/2 cos...
August 25, 2011

math
what symbols
August 24, 2011

math
Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of si -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special tables sin(ƒÎ/6) = cos(&#...
August 24, 2011

math
its okay I have it 1.596322539
August 24, 2011

math
4^(3-x)=7 showing all steps
August 24, 2011

math
use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and tan 4pi/3 = root 3. ...
August 24, 2011

Matg
Write 7hb as a phrase.
August 24, 2011

Math
Write a phrase for each expression 7hb
August 23, 2011

math
use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and tan 4pi/3 = root 3 but...
August 23, 2011

math
solve 4^(3-x)=7 to 3 s.f. showing all workings. I have got as far as -x =log(7)-3log4/log(4)
August 23, 2011

maths
in triangle abc, the point y divides the side ab in the ratio 2:1. The point z on ac is such that yz is parallel to bc. choose two options that are the same as the ratio bc:yz a)1:1.5 b)1:2 c) 1:3 d)1.5:1 e)2:1 f)2:3 g) 3:1 h)3:2
August 23, 2011

calculus
Tony has a rectangular piece of cardboard which is 60 cm by 40 cm. By cutting squares from each corner of the cardboard and turning up the sides, can he form an open-topped box which will hold (a) 6656 cubic centimeter? (b) 9000 cubic centimeters? (c) what is the maximum ...
July 30, 2011

Physics
Hot air balloons float in the air because of the difference in density between cold and hot air. In this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. To do this, use the following variables and make these ...
July 13, 2011

statistics
If someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…?
July 10, 2011

math
is it 1
July 9, 2011

math
which of the following expressions shows the equation to use in finding the dimensions of cube n by n by n by n with a volume of 125? 1. n to the third power =125 2. n to the second power= 125 3. 3n=125 4.n=125/3
July 9, 2011

math
oh your right okay so then its 135
July 9, 2011

Physics
A 50-story building is being planned. It is to be 200.0 high with a base 48.0 by 66.0 . Its total mass will be about 2.5×107 , and its weight therefore about 2.5×108 . Suppose a 200 wind exerts a force of 860 over the 66.0 wide face . Part A Calculate the magnitude...
June 29, 2011

Geometry
John places a mirror on the ground between himself and an apartment building. He then stands so that he can see the top edge of the building in the center of the mirror. The center of the mirror is 6.10 meters from her feet and 18.30 meters from the building. John’s eyes ...
June 27, 2011

bus stats
Given the following information about a hypothesis test of the difference between two means based on independent random samples, what is the standard deviation of the difference between the two means? Assume that the samples are obtained from normally distributed populations ...
June 23, 2011

business stats
Given the following information about a hypothesis test of the difference between two means based on independent random samples, which one of the following is the correct rejection region at a significance level of .05? Assume that the samples are obtained from normally ...
June 23, 2011

mba stats class, help!!
true or false. In an experiment involving matched pairs, a sample of 14 pairs of observations is collected. The degree of freedom for the t statistic is 12
June 23, 2011

Chemistry
Whoops forgot that part of the question: A closed flask originally contains 1.7 mol/L SO2 and O2.
June 15, 2011

Chemistry
The oxidation of sulfur dioxide to sulfur trioxide is an important reaction. At 1000K, the value of Kc is 3.6 x 10^-3. What is [SO3] at equilibrium when the reaction vessel is maintained at 1000K.
June 15, 2011

mba stats class, help!!
a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...
June 15, 2011

nba stats help!!
The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?
June 15, 2011

mba stats class, help!!
A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
June 15, 2011

stats
A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
June 14, 2011

stats
The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?
June 14, 2011

stats
a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...
June 14, 2011

stats
a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...
June 14, 2011

stats
a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...
June 14, 2011

Chemistryy.
Some mole problems! Which quantity of neon may be represented by the symbol Ne? A) 1 gram B) 4 liters C) 6 x 1023 atoms D) 2 moles A sample of nitrogen containing 1.5 x 1023 molecules has the same number of molecules as a sample containing A) 1.0 mole of H2 B) 0.25 mole of O2 ...
June 6, 2011

physics
the 2lb box slides on the smooth curved ramp. if the box has a velocity of 30ft/s at A, determine the velocity of the box and the normal force acting on the ramp when the box is located at B and C. assume the radius of curvature of the path is still 5 ft.
June 1, 2011

physics
the 2lb box slides on the smooth curved ramp. if the box has a velocity of 30ft/s at A, determine the velocity of the box and the normal force acting on the ramp when the box is located at B and C. assume the radius of curvature of the path is still 5 ft.
June 1, 2011

physics
the 3 lb block A rests on a surface for which the coefficient of kinetic is Mk=.30 determine the distance the 8-lb cylinder B must descend so that A has a speed of Va = 5ft/s starting from rest.
June 1, 2011

physics
a toy spring gun is used to shoot 28-g bullets vertically upward. the un deformed length is 150 mm, it is compressed to a length of 25 mm when the gun is ready to be shoot and expands to a length of 75mm as the bullet leaves the gun. a force of 45 N is required to maintain the...
June 1, 2011

physics
Does the resonance position change as the length of the tube changes, for example a longer tube?
May 8, 2011

pre- algebra
Tell weather a triangle with side lengths of 10,24,26 could be 45 45 90 degrees or 30 60 90 degrees. Explain.
May 8, 2011

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