Tuesday

February 21, 2017
Total # Posts: 249

**Physics Help**

A force sensor is used to measure a force applied to a 9.1 kg box on a hard, horizontal surface. It records that the box starts to move when the force is equal to 26.9 N. This force makes the box start to move with an acceleration of 0.2 m/s2. Find mu sub s/k respectively.

*June 18, 2012*

**algebra 1**

Choose the product. -7p3(4p2 + 3p - 1) -28p5 - 21p4 + 7p3 28p6 + 21p3 - 7p 21p3 + 8p2 + 3p4 - 8p -21p5 + 8p4 - 3p3

*June 11, 2012*

**Chemistry**

Calculate the uncertainty in the position (in A) of an electron moving at a speed of (6.5 +/- 0.1)* 10^5m/s. The mass of an electron is 9.109x10^-31 kg. Thanks!

*May 7, 2012*

**algebra**

If a train goes 25 mph how many hours. Does it need to go in 125 miles

*May 7, 2012*

**history**

How did George Kennan’s containment doctrine change during the Truman, Eisenhower and Kennedy administrations? Which president was the most successful in containing Communism?

*April 19, 2012*

**history**

Describe President Reagan’s foreign policy goals and summarize several of the major, specific actions he took to meet those goals.

*April 19, 2012*

**history**

How was the civil rights movement of the 1950s and 1960s a continuation of the Reconstruction-era struggle for blacks to achieve equality?

*April 19, 2012*

**chemistry**

empirical mass = (12+1= 13) molar mass = 78 78/13 = 6; therefore, (CH)6 = C6H6 so that's correct?

*April 19, 2012*

**chemistry**

Benzene has the empirical formula CH and an experimental molar mass of 78 g/mol. What is its molecular formula? Explain how you got your answer.

*April 19, 2012*

**history**

How did George Kennan’s containment doctrine change during the Truman, Eisenhower and Kennedy administrations? Which president was the most successful in containing Communism

*April 16, 2012*

**physics**

A charge of 2.1 nC and a charge of 4.7 nC are separated by 57.90 cm. Find the equilibrium position for a -4.7 nC charge. ____ cm from the 2.1 nC charge. what is the answer? and how did you get it? thaanks

*April 11, 2012*

**chemistry**

will SrSO4 precipitate when .1g of Na2SO4 are added to 1L of a .01M solution of Sr

*March 21, 2012*

**MATH FOR TEACHERS**

the roof is a right rectangular prism and the floor is a rectangle. (its the outside of a warehouse). for the roof- the base has 51 x 51. The rectangular for the floor is 120 (l) x 20 (h) x 90 (w). need to find the volume and surface area. (counting the floor) Give an ...

*March 19, 2012*

**math for elementary teachers**

the roof is a right rectangular prism and the floor is a rectangle. (its the outside of a warehouse). for the roof- the base has 51 x 51. The rectangular for the floor is 120 (l) x 20 (h) x 90 (w). need to find the volume and surface area. (counting the floor) Give an ...

*March 19, 2012*

**math for elementary teachers**

thank you. helped out alot!

*March 19, 2012*

**math for elementary teachers**

Suppose that carpeting cost $12.36 per square yard at a carpet store. what will be the cost to carpet a conference room if the rooms dimensions are 110 ft by 42 ft. (the conference room should seat 380 people using 6' diameter tables each seating 10 people.)

*March 19, 2012*

**Chemistry**

A string has a length of 84 cm. The string is stretched taut, and both ends are restricted to be nonmoving. Touching the string at which of the following points will not produce a standing wave when the string is plucked?

*February 15, 2012*

**science**

If the magnitude of the electric field in air exceeds roughly 3 X10^6 N/C, the air breaks down and a spark forms. For a two-disk capacitor of radius 52 cm with a gap of 1 mm, what is the maximum charge (plus and minus) that can be placed on the disks without a spark forming (...

*February 11, 2012*

**history**

How was Fort William Henry massacre used by the British and the American colonists to justify brutality against the Indians? HELPPPP PLEASE

*February 6, 2012*

**history**

Discuss the importance of landscape in crafting battle strategy for both the French and the English

*January 30, 2012*

**history**

Discuss the importance of landscape in crafting battle strategy for both the French and the English. HELP PLEASE!

*January 30, 2012*

**philosophy**

what makes an idea dangerous?

*January 25, 2012*

**12th grade physical science**

When would you use a line graph to present data

*January 20, 2012*

**business/accounting**

Christy Burch and Myung Lim, partners, compared their current income statement with their income statement of a year ago. They noted that sales were 12.0% higher than a year ago. They also noted that the total expenses were 20.0% higher than a year ago. What type of analysis ...

*January 17, 2012*

**Liberal Arts**

Part 1: You finally made it…graduation day has arrived! Your parents are so proud that they are throwing you a HUGE party. They have rented a big tent for your graduation party just in case it rains. The inside of the tent (represented by the blue area) is set up for a ...

*January 14, 2012*

**trigonometry**

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ...

*January 9, 2012*

**trigonometry**

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ...

*January 8, 2012*

**trig**

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ...

*January 4, 2012*

**english**

How does the text use clothing and garments (or the lack thereof) to portray Edna’s rebellion against Victorian norms? Use examples from the book to support your answer.

*January 4, 2012*

**introduction to floral design amd flowers**

Im trying to find out if my answers to the exam is right

*December 26, 2011*

**basics and tools of floral design**

The fabric label doesn’t say if the linen was preshrunk. You test the fabric for shrinkage and determine it needs to be shrunk. How do you do this? A. Wash the material in cold water and dry on high in dryer. B. Immerse the material in hot water and drip dry. C. Wash the ...

*December 13, 2011*

**history**

Flexible

*December 12, 2011*

**chemistry**

calculate the hydronium ion concentration in an aqueous solution that contains 2.50x10^-6M in hydroxide solution

*December 1, 2011*

**math boxes 3.3**

make up a set of at least twelve numbers that hav the following landmarks maximum:8 range:6 mode:6 median:5

*October 24, 2011*

**Math**

10.30

*October 5, 2011*

**physics**

A 30 kg child steps to a dock from a 60 kg boat,giving the boat an acceleration of 2m/s^2. Neglecting water Resistance, the acceleration experienced by the child is?

*October 4, 2011*

**Essential Mathematics 1**

Can somebody please help me evaluate: 13 1/3 + 6 2/9 ? (=

*September 19, 2011*

**Essential Mathematics 1**

Yay! Thanx soooo much! <3

*September 19, 2011*

**Essential Mathematics 1**

The answer would be 7 right?

*September 19, 2011*

**Essential Mathematics 1**

Can somebody please help me Evaluate: 3 1/9 * 2 1/4 ? (=

*September 19, 2011*

**Essential Mathematics 1**

Nope. its 10 2/3 divided by 4

*September 19, 2011*

**Essential Mathematics 1**

10 2 2/3 / 4

*September 19, 2011*

**PHYSICS**

force = change of pressure/area = 25000 N

*August 1, 2011*

**PHYSICS**

The door and the seals on an aircraft are subject to a tremendous amount of force during flight. At an altitude of 10,000 m (about 33,000 ft), the air pressure outside the airplane is only 2.7 x 104 N/m2, while the inside is still at normal atmospheric pressure, due to ...

*August 1, 2011*

**Chemistry**

A 110.-g sample of copper (specific heat capacity = 0.20 J/°C · g) is heated to 82.4°C and then placed in a container of water at 22.3°C. The final temperature of the water and copper is 23.5°C. What is the mass of the water in the container, assuming ...

*July 11, 2011*

**Chemistry**

In a coffee-cup calorimeter, 1.70 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.71°C. Assuming the solution has a heat capacity of 4.18 J/°C &...

*July 11, 2011*

**calculus 2**

Six and one-half foot-pounds of work is required to compress a spring 3 inches from its natural length. Find the work required to compress the spring an additional one-half inch.

*May 31, 2011*

**algebra**

b=5

*May 31, 2011*

**Advance Algebra (Graphing)**

I need help finding the asymptotes, and domain of these two graphs.. 1) 1/x^2 Vertical Asym.:? Domain:? Horizontal asym.: y=0 2) x^2/1 Vertical Asym.:? Domain:? Horizontal asym.: none THANKS!

*May 22, 2011*

**chemistry**

i do not understand how to do these and i have a question on my test tomorrow on this stuff can someone explain to me how to do this? for each of the following molecules draw the lewis structure, determine the shape, determine the polarity, and determine the kinds of ...

*May 18, 2011*

**science**

the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts.

*May 18, 2011*

**chemistry**

the human body obtains 2000 kj from a candy bar. if this energy were used to vaporize was at 100 degrees celcius, how much water in liters could be vaporized? ??(assume that the density of water is 1.0g/ml)

*May 18, 2011*

**College Algebra**

Determine whether x+6 is a factor of x^3+4x^2-27x-90

*May 2, 2011*

**Algebra**

Thanks Damon!!!

*April 30, 2011*

**Algebra**

ok did i do this right? evaluate the expression log(base4)(16)(4) log(4) 16 + log(4) 4 ? can you do that?

*April 30, 2011*

**Algebra**

Ok well bobpursley first of all your a genius ;) second of all im a newbie at this logorithm stuff. thank you for helping me!

*April 30, 2011*

**Algebra**

Expand the expression of log5x^(1/3)y^6 5 is the base of the log. this is pretty tricky stuff and im not sure how to attempt it..

*April 30, 2011*

**Algebra**

Solve the equation and check for extraneous solutions. 10^((x^2)+1)=100,000 How do i handle this when the exponents have exponents?

*April 30, 2011*

**Algebra**

Find a power function of the form y=ax^b whose graph passes throught the points (2, 5) and (8, 12). How do i solve this??

*April 30, 2011*

**Physics**

NVM I got it!!

*April 17, 2011*

**Physics**

A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is ...

*April 17, 2011*

**Physics**

I got that vi=10.29 then when I sub in I get that v=11.23 but this is the wrong answer. Am I doing something wrong?

*April 17, 2011*

**Physics**

Please Help!!! A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5 m before stopping. The police officer, knowing that the coefficient of kinetic friction between ...

*April 17, 2011*

**Physics**

Suppose the roller coaster in Fig. 6-41 (h1 = 30 m, h2 = 11 m, h3 = 20) passes point 1 with a speed of 2.10 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point 2? The distance traveled is 50.0 m.

*April 15, 2011*

**Physics**

A child in a boat throws a 5.40 kg package out horizontally with a speed of 10.0 m/s, Fig. 7-31. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25.0 kg and that of the boat is 40.0 kg.

*April 14, 2011*

**Chemistry**

51grams/132.14grams=.386moles

*April 14, 2011*

**english**

I need help on writing an essay on how entrepreneurship affects me

*April 7, 2011*

**alg I**

3/5. 5/5 - 2/5 = 3/5 chance of pulling out a green chip.

*March 20, 2011*

**Physics**

Dr. Miller pulled a wooden crate at a constant accelerationof 1.23 meters per second per second with a forceof 752 newtons at an angle of 22 degrees above the horizontal. The coefficient of kinetic friction between the crate and the floor was 0.347. Find the mass of the crate.

*March 20, 2011*

**Biology**

How does the structure of macromolecules such as proteins act as an index of relatedness between species?

*March 19, 2011*

**math**

if sam earned $4,000 and gave 1/5 wawy and invested 1/2 of the remaining amount how much did he have left?

*March 15, 2011*

**math(unit rate)**

$3\4LB

*March 12, 2011*

**math**

joe borrows $4,000, the loan is for 18 months at 5% interest, whats the total amount due on the loan?

*March 8, 2011*

**Chemistry II**

Why is YBa2Cu3O7 a super conductor? Explain Chemistry and Structural bases.

*February 16, 2011*

**Chemistry**

Show, with equations, why the solution from which BaSo4 is precipitated cannot be allowed to be more then 0.01-0.05M in HCl.

*February 16, 2011*

**chemistry**

How many monosaccharides most likely make up this molecule: C 10H20 O10

*February 15, 2011*

**physics**

As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 8.00 ...

*February 6, 2011*

**Math**

Alex has 7 dimes and 3 nickels.What fraction of the coins are dimes?

*January 25, 2011*

**algebra**

Suppose that Maria has 140 coins consisting of pennies, nickels, and dimes. The number of nickels she has is 9 less than twice the number of pennies; the number of dimes she has is 19 less than three times the number of pennies. How many coins of each kind does she have?

*January 17, 2011*

**College Algebra**

The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 44 years.

*November 17, 2010*

**college chem**

Write a chemical equation to express the fact that, at 0 °C, ice melts by absorbing 334 J of heat per gram of ice.

*November 10, 2010*

**CHEMISTRY**

A single drop of water is injected into a balloon at 25C that contains ammonia, at 1 atm. What will happen to the V of the balloon?Assume Henry's constant is ~0.02 atm/M

*November 9, 2010*

**physics**

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

*November 6, 2010*

**chemistry**

Exactly 10mL of water at 25 degrees C was added to a hot iron skillet. all of the water was converted into steam at 100 degrees C. If the mass of the pan was 1.20 kg and the molar heat capacity of iron is 25.19 L/mol*C, what was the temp change of the skillet?

*October 26, 2010*

**chemistry**

During a strenuous workout, a student generates 2000 kJ of heat energy. What mass of water would have to evaporate from the student's skin to dissipate this much heat?

*October 26, 2010*

**algebra**

How do you graph this liear inequality 2y greater than equal to 4x-6

*September 26, 2010*

**physics**

Water flows into a swimming pool at a rate of 9.59 gal/min. If the pool dimensions are 30.9 ft wide, 47.6 ft long and 13 ft deep, how long does it take to fill the pool? (1 gallon = 231 cubic inches). Answer in units of minutes.

*September 15, 2010*

**Chemistry**

Thank you so much DrBob222

*August 25, 2010*

**Chemistry**

Please check this over and see of they are right...if they are not can you please tell the the right answer and explain how you got it. I think I am getting myself confused. Thank you. Write the neutralization reaction for each of the following. Balance the equations. a. HI(aq...

*August 25, 2010*

**algebra**

Select the ordered pair from the choices below that is a solution to the following system of equations: 4y = x - 13 2x + 16y = 20

*August 24, 2010*

**Chemistry**

A balloon is filled to a volume of 1.0 102 mL at a temperature of 38.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 multiplied by 102 K. What is the final volume of the balloon?

*June 11, 2010*

**science**

whatis the mass of a electromanetic roller coaster?the weight?

*May 25, 2010*

**college**

Assume that the life expectancy of U.S. males is normally distributed with a mean of 80 years and a standard deviation of 4 years. What is the probability that a randomly selected male will live more than 85 years?

*April 29, 2010*

**math**

Argus company makes three products: A, B, and C. Each unit of A costs $4, each unit of B costs $2, and each unit of C costs $1 to produce. Argus must produce at least 20 As, 30 Bs, and 40 Cs combined. Minimize Argus's costs

*April 20, 2010*

**physcis**

a 16990kg airplane lands with a speed of 91m/s on a stationary aircraft carrier deck that is 115m. find workk done by nonconservative forces in stopping the plan.

*March 26, 2010*

**6th grade - English**

i need help with nt and ftthn

*March 22, 2010*

**economics**

If businesses believe consumption will increase six months from now, everything else held constant, and they begin to increase investment, what do you predict will happen to aggregate demand?

*March 4, 2010*

**4th grade**

who was the first artist in the world

*January 19, 2010*

**spanish**

how do you conjugate the verb preocuparse in the present tense in all forms??? Please if you know know how to do it correctly that wld greatly appriciated!!

*January 13, 2010*

**9th grade**

4y-9=15

*December 23, 2009*