# Posts by mar

Total # Posts: 71

Math Trig
A ladder 15 m long can so be placed that it will reach a point on a wall 10 m above the ground. By tipping it back without moving its feet, it can be made to reach a point on another wall 8 m above the ground. What is the horizontal distance between the walls?

chemistry
empirical formula for K 60.0% C 18.5% N 21.5% and P 7.5% I 92.5%

History
What were the characteristics of English colonies in the Chesapeake region, the Carolinas, the middle Colonies-Pennsylvania, New York, New Jersey, and Delaware-and New England prior to 1700? "The Restoration in the Colonies," and"The Middle Colonies and Georgia&...

science
Carbon+argon= + =

algebra
car averages 20 miles per gallon of gas in city driving and 30 miles per gallon in highway driving. At these rates, how many gallons of gas will the car use on a 300-mile trip if 4/5 of the trip is highway driving and the rest is city driving?

math
Square of a side x are cut from each corner of an 8 inches * 5 inches rectangle, so that its sides can be folded to make a box with no top. Define a function that can represent the volume of this box.

physics
Soft tissue has a linear attenuation coefficient in the range of μ = 0.35 cm−1 at 30 keV and μ = 0.16 cm−1 at 100 keV. For this problem we use μ = 0.21 cm−1, which applies at around 50 keV incident X-ray energy. (a) What fraction of X-ray ...

chem
the mass/volume percent of a NaCl solution in which 136 g of NaCl is dissolved in enough water to give a total volume of 4.90 L .

math age problem
Three years ago, Jim was half as old as Tom. Three years from now, Jim will be half as old as Michael. If Jim's age now is half as old as Michael's age three years ago, How old are Jim, Tom and Michael at present?

Elementary Statistics
determine whether the given is a statistics or parameter. 1.) There are 50 capitol states in the US. Answer: Parameter 2.) Among the flights included in the sample of flights in Data set 15 in Appendix B, 21% arrived late. Answer: Statistics

Math
3.3

chemistry
600 gallons of 15 M nitric acid were added to a lake. The initial pH of the lake was 5.90 and the final pH was 3.70. What is the volume of the lake?

chemistry
How do I find the initial rate of reaction for 4.)? 2NO(g)+Cl2(g) ---> 2NOCl(g) [NO] (mol/L) [Cl2] (mol/L) Initial Rate (mol/L * min) 1.) 0.20 1.) 0.10 1.) 0.63 2.) 0.20 2.) 0.30 2.) 1.92 3.) 0.80 3.) 0.10 3.) 2.58 4.) 0.50 4.) 0.50 4.) ???

chemistry
how do I write the rate of the reaction for the following: Cl(g)+O3(g)-> ClO(g)+O2(g)

chemistry
ok so 34+273=307 307X1/2=153.5 .693/153.5=.0045 I think its a second order reaction what do I do for that??

chemistry
the half-life of the reaction, at 34 degrees celsius and Ppan=13.2 torr, is 164.0hr. Calculate the rate constant for the reaction. confused on what to do here

chemistry
The question is: What statements are true for the standard entropy change for the conversion of ozone to oxygen? The choices to pick from are: 1. Molecular factors predict an increase in entropy 2. Stoichiometric factors predict a decrease in entropy. 3. Molecular factors ...

chemistry
I'm not really sure what liquid H20 kj/mol is?

chemistry
sucrose change of H is -2226.1kj/mol fructose change of H is -1265.6KJ/mol calculate the enthalpy change for the hydrolysis reaction of sucrose. sucrose + H2O(l)-> C6H12O6(s)+Fructose Is it just the products-reactants?? I'm confused.

chemistry
Co2(aq)->Co2(g) calculate the free-energy change for this reaction at 25 degrees Celsius.

chemistry
The question is: What statements are true for the standard entropy change for the conversion of ozone to oxygen? The choices to pick from are: 1. Molecular factors predict an increase in entropy 2. Stoichiometric factors predict a decrease in entropy. 3. Molecular factors ...

chemistry
what statements are true for the standard entropy change for the conversion of ozone to oxygen? Select all the apply? 2 O_3 (g) > 3 O_2 (g) Molecular factors predict an increase in entropy Stoichiometric factors predict a decrease in entropy. Molecular factors predict a ...

calculus
so it would not be 50 either but 5?

calculus

calculus
how did you get the 150? I was thinking it would be 50

calculus
The number of U.S. citizens 65 and older from 1990 through 2050 is estimated to be growing at the rate of, R(t)=0.063t^2 -0.48t+3.87, (0 less than or = t less than or = 15) million people/decade, where t is measured in decades and t = 0 corresponds to 1900. Show that the ...

physics
A train is moving parallel and adjacent to a highway with a constant speed of 24 m/s. Initially a car is 48 m behind the train, traveling in the same direction as the train at 35 m/s and accelerating at 3 m/s ^2 . What is the speed of the car just as it passes the train?

physics
A speeder passes a parked police car at a constant speed of 25.8 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.68 m/s^2. How much time passes before the speeder is overtaken by the police car? Answer in units of s How far does the ...

Science
Leigh is right everybody I just got a 100%

Math
dependent variable

English
Can anyone help me figure out what's wrong with this sentence? "The lighthouse is further away than it first appeared."

English 12
1 B "the second coming" 2.A "gazing up into... 3.D go to heaven 4.C dark and somber 5.B "curse,bless me.. 6.A green as grass 7.D the school master 8.B parallelism 9.C desolate 10.A understatement 11.C discouraging 12.B it could no longer.. 13.D a villanelle...

statistics
Assume that you are preparing a report on MM207 statistics students at Kaplan University to present to the Kaplan Board of Trustees. Prepare an appropriate graphical representation for each of the following variables. a) The different majors of students taking MM207. b) The ...

Physics
Ten meters away from a long straight wire, the field is 10-4 (10 to the negative four) Tesla. What current flows through the wire? I know the answer is 5.0kA but I am not sure what formula to use.

Quantum Physics
a) What quantum state do you have to input in order to get output |00⟩ ? b) What quantum state do you have to input in order to get output |11⟩ ?

Mechanics
A hunter aims directly at a target on the same level of 120m away. a.) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? b.) At what angle should the gun be aimed so the target will be hit?

physics
Amass of 0.5 kg is whirled at 120 rpm in a horizontal circle at the end of a string 2 meters long. Neglecting the force due gravity, find: (a) the angular velocity (b) the centripetal acceleration.

Accounting
Identify whether each description best applies to a periodic or a perpetual inventory system. a. Provides more timely information to managers. b. Requires an adjusting entry to record inventory shrinkage. c. Markedly increased in frequency and popularity in business within the...

accounting
Discuss the ethics of what Amy is doing. Are there any consequences to her actions? How does the store account for Amy’s returns?

accounting
What items appear in financial statements of merchandising companies that do not appear in the financial statements of service companies? Why is there a difference?

Accounting
What is the difference between cash basis and accrual basis accounting? Why do accrual-basis financial statements provide more useful information than cash-basis financial statements? Describe when each method (cash basis and accrual basis accounting) would be appropriate to ...

Current political issues in the US
It would be very much helpful if you specify those issues you mentioned (: Thanks!

Current political issues in the US
Could any one help me name some current political issues here in the US? Thanks in advance!

NEWTON'S LAWS (FORCES)
Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 78.0N is applied to box A . Starting from rest, box B descends 12.3 m in 3.80s . The tension in the rope connecting the two boxes is 30.0 N What is...

physics
Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 78.0N is applied to box A . Starting from rest, box B descends 12.3 m in 3.80s . The tension in the rope connecting the two boxes is 30.0 N What is...

Math - Possible or Potential rational zeros
2x^5+9x^3+3x^2-6

acc 280
P3-1 A Tony Masasi started his own consulting firm, Masasi Company, Inc., on June 1, 2008. The trial balance at June 30 is shown on page 129. MASASI COMPANY, INC. Trial Balance June 30, 2008 Account Number Debit Credit 101 Cash \$7,150 112 Accounts Receivable 6,000 126 Supplies...

acc 280
E3-3 Conan Industries collected \$100,000 from customers in 2008. Of the amount collected, \$25,000 was from revenue earned on account in 2007. In addition, Conan earned \$40,000 of revenue in 2008, which will not be collected until 2009. Conan Industries also paid \$70,000 for ...

math
there are 80 fourth graders in school of these, 35 were boys. what fractional part of the fourth graders were girls

math
there are 80 fourth graders in school of these, 35 were boys. what fractional part of the fourth graders were girls

Chemistry
We're learning about single displacement reactions. What happens when Mg + Zn two nitrate reacts? And when Al + Zn two nitrate reacts? Are there colour changes or precipitates formed?

Economics
animation

Physics
Apparently you must use sine instead of cosine. Im still on a mission to find out why though.

finance
What major benefits do corporations and investors enjoy because of the existence of organized security exchanges?

PHYSICS
A 69.0 firefighter climbs a flight of stairs 22.0 high. How much work is required?

Math
what's the 32.2ft/s^2

algebra
A line passes through (7, –6) and (8, –5).

math
A group of goats&duck s hav a total of 99 heads n legs among thm. Ther r twice as many ducks as ther r goats. How many r ther of ech?

physics
F=ma =0.5×4 =2N

PHYSICS
An object of mass M = 1,284 g is pushed at a constant speed up a frictionless inclined surface which forms an angle θ = 50 degrees with the horizontal. What is the magnitude of the force that is exerted by the inclined surface on the object? (I'm using 1.284*9.81*...

math0301
How do i translate this phrase into algebric expression and how do i label. Twice the difference of a number and eight

algebra
Please help, very lost Evaluate the exponential function for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph; submit the graph via the Dropbox. State the domain and the range of the function...

algebra
Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this. log[5] (5x - 1) = 1

Accounting
1. Capital : 183750 Labor: 146774

psychology
Joe ,aq high school junior , is considering a career in medicine but he is unsure if he want to commit himself to several more years of schooling .with whom is he most likely to consult with on this issue a)best friend b)girlfriend c)parents d)guidance counselor

Childcare
A. STYROFOAM