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October 20, 2014

Posts by bob


Total # Posts: 2,428

physics
Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
April 18, 2010

physics
A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third season?
April 18, 2010

physics
Does a free falling object have a velocity of zero? If it does then is it zero for the initial velocity or the final velocity?
April 18, 2010

Physics Gr.11
thanks!
April 18, 2010

science
does the pumping of a soap dispenser have anything to do with boyles law?
April 18, 2010

math/substituion method
x+3y=-6 3x+9y=6
April 17, 2010

Langusge Arts
what are the metaphors in here
April 14, 2010

English
buhgtuyrvwo6qtp28 qte87p2ety q2hye89ggggggggggggggggggggggggggggggggggggs7yu8oydu8yqo9syvqwhyuivy2qgeuyv7iqwugecuyl wgehjygtw tdgyhbwvg dguywbg sduyqw gt7yqwe utys ugsv asuyw vdb syyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyys7duiw68d6vw6ed
April 14, 2010

trig
8========)--------
April 13, 2010

Chemistry
Assuming that sea water is a 3.5 wt % solution of NaCl in water, calculate its osmotic pressure at 20°C. The density of a 3.5% NaCl solution at 20°C is 1.023 g/mL.
April 13, 2010

Chemistry
How much heat is released when 75.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol °C), and the molar ...
April 13, 2010

Chemistry
Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 25.0°C to gaseous CCl4 at 76.8°C (the normal boiling point for CCl4)? The specific heat of CCl4(l) is its heat of fusion is and its heat of vaporization is
April 13, 2010

Science
When 260. mL of 1.50 x 10-4 M hydrochloric acid is added to 125 mL of 1.75 x 10-4 M Mg(OH)2, the resulting solution will be
April 13, 2010

chemistry
We want to make 100. mL of 1.0 M NaA solution by dissolving solid NaA in water. What mass of solid NaA is needed?
April 12, 2010

9th grade geometry
take 360 divided by how many slices it was cut into for the arc of each. divide 360 by that number, multiply it by pi, than multiply it by the radius. that'll give you the area of one slice, so all you have to do now is multiply the area of one slice by 3 for all 3 slices...
April 12, 2010

math riddle algebra pizzaz
living in x aisle
April 12, 2010

geometry
i have only a measuremment for one side of a triangle need to find the other to to find area how do i do this
April 12, 2010

Calculus
How did you guys get those formulas I have the same question and I have no idea how to start it
April 10, 2010

phisics
676
April 7, 2010

chemistry
Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?
April 6, 2010

MATH
IS 8 FL OZ ONE CUP
April 6, 2010

Chemisty
7,9
April 5, 2010

accounting
I am attempting to study for an exam for tomorrow and cannot figure out the equity method entries up to 2006 for this problem, can someone please help! Parent Corporation owns 80% of Subsidiary Corporation’s outstanding common stock that was purchased at book...
April 5, 2010

chem lab (webwork)
the answer is NOT d!!...i just did it and got it wrong -__-
April 5, 2010

elementary math
when finding the factors for 841 what is the largest factor you would have to test?
April 2, 2010

algebra
6 over x to the 10th times x to the 17th over 15
April 1, 2010

algebra
6 over x to the 10th times x to the 17th over 51
April 1, 2010

science
The ______ of a transverse wave is the distance between 2 crests or 2 troughs.
March 31, 2010

Geography
32. Bucharest, Romania 33. Budapest, Hungary
March 30, 2010

Statistics
How do you calculate the value of z* and t* on the TI-84 and TI-89 (the number used in confidence intervals)?
March 30, 2010

Math
I know that's the first thing that comes to mind, but my teach said that it can be done. He said that the answer is $0.05, so if someone can work backwards somehow and explain to me how he arrived at that answer I would appreciate it. :)
March 28, 2010

Math
If a bottle and a stopper cost $1.10. How much does the stopper cost?
March 28, 2010

math
X= 1
March 28, 2010

reiny
Where did you get .55? I don't need the slope I don't think. This is a pretty straightforward Q, I don't need to graph it.
March 28, 2010

another word problem!
iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t and t represent the number of years since 1993. The linear function E(t) that fits this data is: E(t)=_t + _ (round to the nearest tenth) Use the ...
March 28, 2010

please help! Examples in book are different!
train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
March 28, 2010

word problem
train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
March 28, 2010

math
I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
March 28, 2010

math
how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
March 28, 2010

math
Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
March 28, 2010

math substitution method
I know this! Put it in for x. So 7(28-6y) +5y=-26 use that to get y, then plug your answer for y into one of the equations to get x
March 28, 2010

math
Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
March 28, 2010

algebra/common math
how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
March 28, 2010

algebra
I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
March 28, 2010

3rd grade
Unscramble cioponam
March 23, 2010

6th grade - English
what is the antonym for ndrvr
March 22, 2010

MATH - Can someone please help!
What is the solution of the interval notion? x less than 6 and x greater than -3
March 21, 2010

algebra
How do I solve this with the elimination method? 5x-10y=4 5x-10y=5 I need x=, and y= to get an ordered pair, but every time I mult. by a neg, everything goes away instead of just one variable! please help!
March 21, 2010

chemistry
At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: O (g) H O(l) 2 HNO (g) 2 2NO(g) 3 + 2 + 2 ⎯⎯→ 3 . If all of the nitric acid produced by this ...
March 21, 2010

Math
What is the solution of the interval notion? x less than 6 and x greater than -3
March 21, 2010

algebra
how do I break this down? 4x-7 <-4 over 6 the 4x-7 is all over 6 (like a fraction) I thought I just multiply by 6 to get rid of the fraction?
March 20, 2010

algebra
YOU ARE RETART JEWBU
March 17, 2010

6th grade math
answear is x>54(11)+ 20 what is x,=81
March 16, 2010

chemistry
What are the probably products of... a) an aqueous solution of two ionic compounds b) a single compound c) two elements d) oxygen and a compound of carbon and hydrogen ?
March 16, 2010

Environmental Science
very helpful :)
March 15, 2010

math
How do I solve the equations using the elimination method: .3x-.2y=4 and .4x +.3y= 49/23 Normally I would multiply the decimals by 10 to make them whole numbers, but that fraction is really throwing me off. What do I multiply to eliminate that fraction? Please help!
March 14, 2010

Auditing
1. Which of the following matters would an auditor most likely consider to be a significant deficiency to be communicated to the audit committee? A. Management's failure to renegotiate unfavorable long-term purchase commitments. B. Recurring operating losses that may ...
March 11, 2010

Business
Looks right to me
March 5, 2010

algebra 1
Itwantedtobethenightmare
March 2, 2010

Calculus
Where did you get the (L-5) and the (W-4)?
March 1, 2010

math
When a lady faints, what number do you need to bring her?
February 28, 2010

Chem
A gas at a pressure of 1 atm, a volume of 1 , and a temperature of 25 C. What would happen to the pressure if the volume were reduced to 0.5 and the temperature increased to 250 C ?
February 27, 2010

math
4N
February 24, 2010

chemistry
Diacetyl, a substance contributing to the characteristic flavor and aroma of butter, consists of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 degrees celsius and 747 torr, a 0.30 gram sample occupies a volume of 111 ml. What is the molecular formula of diacetyl?
February 23, 2010

Chemistry
A mixture of gasses at a total pressure of 95 kPa contains N2, CO2, and O2. The partial pressure of the CO2, is 24 kPa and the partial pressure of the N2 is 48 kPa. What is the partial pressure of the O2?
February 22, 2010

Chemistry
A gas storage tank has a volume of 350,000 when the temperature is 27 degrees celcius and the pressure is 101 kPa. what is the new volume of the tank if the temperature drops -10 degrees celcius and the pressure drops to 95 kPa? please show work.
February 22, 2010

Physics
u r wight and ask ur teacher if u are confused it is the best way...
February 22, 2010

Science
You are 100% correct...I think...
February 22, 2010

Chemistry
A gas occupies a volume of 140 mL at 35 degrees celsius and 97 kPa. What is the volume of the gas at STP?
February 22, 2010

Chemistry
A 10 gram of mass of krypton occupies 15.0 L at a pressure of 210 kPa. What is the volume of the krypton when the pressure is increased to 790 kPa?
February 22, 2010

College physIcs
"You don't seem to be willing to take step one in answering these problems yourself. " What good is just knowing a formula?
February 19, 2010

Calculus
1
February 18, 2010

ethics 125
· Consider the following statements: (a) Asian Americans and Pacific Islanders are a model minority, and (b) Asian Americans and Pacific Islanders belong to a single “Asian American” culture. If someone said one of these statements to you, how would you ...
February 18, 2010

4th grade math
I think Erik meant to say that Judy had 15, not 12. Then, it solves that 27+ (27-12)=42, right? My SIL just called asking us this same question...must be at the same place in the book!
February 17, 2010

Chemistry
4.76 kg
February 17, 2010

spanish
Choose the correct command form. No __________ uds.esos zapatos sucios en la casa! (llevar) A. llevan B. lleven C. lleve D. lleva
February 17, 2010

chemistry
If 2500 ml container is filled with 175 grams of argon at -48 degrees celsius, what is the pressure?
February 16, 2010

chemistry 2
Then your answer is B
February 16, 2010

chemistry 2
im confused i cant set this problem up correctly? I need a lot of help
February 16, 2010

chemistry 2
(2.0/0.5)=4
February 16, 2010

chemistry 2
A gas diffuses only 0.5 times as fast as an oxygen molecule at the same temperature. What is the molecular weight of the gas?
February 16, 2010

Chemistry
How do you convert from mass percentage to molality? I get 0.084 m but that is incorrect.
February 15, 2010

chemistry
how many grams of propane are in a 35L container at 40 degrees and 900 torr?
February 14, 2010

chemistry
how many grams of propane are in a 35L container at 40 degrees and 900 torr?
February 14, 2010

Math
12
February 10, 2010

Physics
a^2 + b^2 = c^2
February 8, 2010

trig
2sin(3x-3.14)-1 find the inverse form of this equation
February 8, 2010

Algebra
Can I simplify this further SQRT( 2 - SQRT(2) )
February 8, 2010

math
need help with this problem 9-10x2 divided by 5+7
February 7, 2010

algebra
what percent of 180 is 27?
February 7, 2010

science
two common ways in which a glacier can cause ersion?
January 28, 2010

math
The percentage of working mothers y can be modeled by the equation y=0.0102x + 0.644 where x is the number of years since 1990. In what year will 90% of mothers be in the labor force?
January 28, 2010

3rd grade
when i am rounded to the nearest ten, i am 30. The sum of my two digits is 5. What number am I?
January 25, 2010

calculus
I tried the integral from 1 to e of 1-lnx^2 but that doesn't work.
January 25, 2010

calculus
Find the volume if the area between the curve y=lnx, x=1, and y=1 is rotated about the x-axis.
January 25, 2010

fifth frade fractions
Two numbers have a product of 3 1/5 and a sum of 3 3/5. one of the numbers is a whole number. What are the numbers?
January 25, 2010

algebra
a)using intercepts, graph the three lines 4x + y - 8=0, 2x - y - 4=0, x + 2y - 16 = 0
January 24, 2010

math
Extremely large numbers, number of sand particles on the world, distance to the nearest star in KM's etc.
January 21, 2010

Chemistry
A 71.0 L cylinder containing CH2O at a pressure of 0.550 atm is connected by a valve to 1.50 L cylinder containing N2 at 266.0 torr pressure. Calculate the partial pressure (atm) of N2 when the valve is opened.
January 20, 2010

AED 204
i just want to know what to do? do u awnser it personally? Appendix D Educational Implications of Socioeconomic Status Matrix Directions: Based on your personal experiences and on the readings for this course, answer the questions in the green section of the matrix as they ...
January 18, 2010

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