Thursday

May 5, 2016
Total # Posts: 1,135

**physics 101**

A person in an elevator is holding a 15 kg block by a cord rated to withstand a tension of 180 N. When the elevator starts up, the cord breaks. What was the magnitude of the minimum acceleration of the elevator?
*September 22, 2012*

**Physics**

A person climbs from a Paris metro station to the street level by walking up a stalled escalator in 96.5 s. It takes 60.0 s to ride the same distance when standing on the escalator when it is operating normally. How long would it take for him to climb from the station to the ...
*September 21, 2012*

**Physics**

A ball is thrown from a point 1.38 m above the ground. The initial velocity is 19.9 m/s at an angle of 33.8° above the horizontal. Find the maximum height of the ball above the ground. Calculate the speed of the ball at the highest point in the trajectory.
*September 21, 2012*

**Science**

pH of: 2.50mL of 0.100M nitric acid added to 30mL of 0.200M potassium hydroxide Please show me working out :)
*September 20, 2012*

**Business Law**

Unconstitutiabal
*September 17, 2012*

**Algebra**

What is the square root of -25? Can you please write out the steps of finding it?
*September 13, 2012*

**chemistry**

Okay thank you for the explanation. For soduim sulfide(NaS), will it form 3 particles in solution? Na+1 and S-2 so would that give you 3? For future reference, for these problems should i first see what type of bond it creates, then if it dissolves in water to get my answer?
*September 12, 2012*

**chemistry**

how many "particles in solution" will form from each sucrose (C12H22O11) molecule added to water? Explain. I don't understand where I am supposed to start... What do I need to know to do this problem? thank you
*September 12, 2012*

**physics**

A pilot is required to fly directly from london, united kingdom to rome, italy in 3.4 hours the displacement is 1.4 x 10 ^3km [s 43 e]. the wind wind velocity reported from the ground is 55km/h [s]. determine the required velocity of the plane relative to the air
*September 10, 2012*

**MATH**

x/2 + 11 = -25 x/4 - 5 + 13
*September 6, 2012*

**math8th**

28a^11b^7 divided by 4a^3b^2
*September 5, 2012*

**English**

I am writing an essay about James Baldwin's Go Tell It on the Mountain, but the essay prompt asks me to disagree or agree with the interpretation of an critical essay we read about this book. For my essay, do I state whether I agree with the article and then use other ...
*August 31, 2012*

**math**

The teacher gave nothing and that doesn't answer my question.
*August 14, 2012*

**math**

My son is in Kindergarten and I have no idea about the "Counters" in the question: 1st) Cover the teddy bears in the top row with different-color teddy bear counters. 2nd) Color the teddy bears in the bottom row to show the colors." Help. Thanks You.
*August 14, 2012*

**Algebra**

-2(t-7)-(t+8)=8
*August 5, 2012*

**Math - Probability**

You invent a new system to make excellent racing tires for the Indianapolis 500/ Your tires are good for an average of 105 miles, with a standard deviation of 7.5 miles. What is the probability that one of your tires can go for at least 44 laps? What is the probability that ...
*July 9, 2012*

**math**

0.6 of Emily's money is €42.How much has she?
*June 18, 2012*

**chemistry**

Ok I got it. I got the correct answer. Thank you so much for explain how to start and for your help.
*June 16, 2012*

**chemistry**

My professor never teach us this kind of question before. I don't know why she put this question as a homework since she doesn't teach us this yet. I need help with one question. I don't know where to start. So don't you mind if you can help me please. Here a ...
*June 16, 2012*

**chemistry**

Yea, I realized that HH is more easy and faster. I'm going use HH better instead other way. Anyway thank you so much for explain.
*June 14, 2012*

**chemistry**

How did you get the 3.94E-10?
*June 14, 2012*

**chemistry**

No, my professor didn't teach student on Henderson-Hasselbalch equation. My professor only show us the Henderson-Hasselblach forumla but not show how to use it. Also she didn't give us what is pKa for this problem. Anyway, thank you so much for your help.
*June 14, 2012*

**chemistry**

This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? If so, can you please explain to me how you get the answer? Also can you show me step by ...
*June 14, 2012*

**Business**

According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book
*June 12, 2012*

**Calculus AB...I really need help**

The region in the first quadrant enclosed by the coordinates axes, the line x=pi, and the curve y= cos(cosx) is rotated about the x-axis. What is the volume of the solid generated.
*May 28, 2012*

**algebra**

12/5+8/13 the denominators have to equal the same so you mult. 5 times 13 and 13 times 5 and the numerators too 156/65+40/65=196/65
*May 28, 2012*

**Calculus AB**

The average value of a continuous function f(x) on the closed interval [3,7] is 12. Whats the value of ∫ from [3,7] f(x) dx?
*May 28, 2012*

**Business**

In a ____________, consumers ultimately decide what should be produced
*May 25, 2012*

**physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
*May 22, 2012*

**TRIG**

I need to state the period and 2 consecutive asymptotes on the graph for the following questions. 1: y = -3 tan pi*x period: pi (?) asymptotes: ? 2: y = 2 sec 4x period: ? asymptotes: ? 3: y = csc (x/3) period: ? asymptotes: ? 4: y = 3 cot (pi*x/2) period: ? asymptotes: ?
*May 21, 2012*

**Math- Trigonometry**

The point, in on the terminal side of an angle in standard position find the exact value of the six trigonometric functions of the angle a. (8,15) b.(-9,-40)
*May 20, 2012*

**health**

Your health care organization has called upon you to lead a work team to identify service-quality problems within the environment. Individual Portion Answer the following questions about work teams: •What are the benefits of a strong work team? •What are the common ...
*May 6, 2012*

**Chemistry 1201**

2.3
*April 15, 2012*

**precal**

A cell phone company’s profit is modeled by the function p(x) = 10x − x2 − 1, where p is expressed in thousands of dollars and x is the number of phones sold in hundreds. How many phones must the company sell to make a profit of more than $15,000?
*April 13, 2012*

**chemistry**

so i just multiply everything?
*April 13, 2012*

**chemistry**

a 5.0 g sample of ice was heated from -20.0 degrees C o 0 degrees C and remained solid. the specific heat of ice is 2.1 j/gC. How much heat did the ice absorb?
*April 13, 2012*

**geometry**

what shape is 2 units wide and 5 units long?
*April 7, 2012*

**Trig Help Please!!!**

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*April 5, 2012*

**statistics**

If the grades on a police entrance exam are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of students received grades of less than 115?
*April 1, 2012*

**Math**

write an equation of a cosine function with Amplitude=1/2, Period=6pi, and Phase Shift=pi/3?
*March 29, 2012*

**science**

1. Two dogs are fighting over a 0.5 kg bone. The larger dog pulls on the bone in one direction with a force of 40 N. The smaller dog pulls in the opposite direction with a force of 36 N. What is the net force on the bone?
*March 29, 2012*

**business**

I just need an example, something to get me thinking in the right direction.
*March 24, 2012*

**Math**

Ok same problem too from 2015 sorry
*March 22, 2012*

**math**

find a to the nearest tenth if a= 36 degrees and c=113.5
*March 16, 2012*

**chemistry **

Mr=112.11 and 0.146mg/mL how do I change thiss to mmol/L
*March 15, 2012*

**Math**

Two numbers have a product of 3 1/5 and a sum of 3 3/5. One of the numbers is a whole number. Find the numbers.
*March 14, 2012*

**physics**

Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value?
*February 15, 2012*

**Physics**

The drawing shows two fully charged capacitors (C1 = 7 µF, q1 = 4 µC; C2 = 16 µF, q2 = 4 µC). The switch is closed, and charge flows until equilibrium is reestablished (i.e., until both capacitors have the same voltage across their plates). Find the ...
*February 14, 2012*

**physics**

Assuming that it takes 0.10 s for the driver to react before applying the brakes, what is the stopping distance (the distance from the point where the driver first sees the need to stop to the point where the car comes to a stop) for a car traveling at 25 m/s if the ...
*February 13, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**Statistics**

You have a fair die. The die has a 2 on two sides, a 4 on two sides and a 6 on two sides. Note: the only possible outcomes for each roll are 2, 4 or 6. (a) Draw a tree diagram that shows the possible outcomes of rolling the die twice (my answer Roll 1: 2, 4, 6 Roll 2: 2,4,6 ...
*February 11, 2012*

**Statistics**

A bucket has 3 blacks and 7 red balls. (a) What is the probability of drawing a black fall on the first draw? (my answer - 3/10 x 100 = 30%) (b) What is the probability of drawing a red ball on the 2nd draw if you replace the black ball you drew on the first draw? (my answer...
*February 11, 2012*

**International Business**

Jack-in-the-Box and McDonald's it is! Thank you! =)
*February 9, 2012*

**International Business**

I need to compare and contrast quality management at two organizations in the same industry. One organization must compete in the domestic market and one in the global market. Could you please give me some ideas on two organizations that fall within that criteria? Thank you
*February 9, 2012*

**chemistry**

You have 20.00 mL of a 0.1M aqueous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.100 M HCl. How do you find the pH of this solution before any acid has been added.
*February 9, 2012*

**chemistry**

You have 20 mL of a 0.1 M aquesous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.1 M HCl. how many mL of acid must be added to reach the equivalence point?
*February 8, 2012*

**Chemistry**

you have 20 ml of 0.1 M aqueous solution of the weak base (CH3)N (Kb = 7.4 x 10^-5). This solution will be titrated with 0.1 M HCl. how many ml of acid must be added to reach the equivalence point?
*February 8, 2012*

**astronomi**

one astronomical units is about 1.5 X 10 km .
*February 8, 2012*

**math**

It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?
*February 7, 2012*

**math**

The HIM department listed the following LOS data for the longest admissions for the month of September. If patient A's LOS was 66, what is that percentile? 43, 45, 54, 55, 59, 60, 62, 64, 66, 67, 67, 68, 68, 69, 70, 70, 71, 72, 74, 75
*February 7, 2012*

**trig**

if (0,-7) lies on the terminal side of angle theta in standard position, find each value sec(theta) , cot(theta) and sin(theta)
*February 6, 2012*

**chemistry- pH, neutralization**

What volume of NaOH was required to have neutralized the HCl. HCl + NaOH --> H2O + NaCl There no other information given in the problem except in later questions like the NaOH had 0.1 M and that there was 50.00 mL of HCl.
*February 2, 2012*

**MATH WORD PROBLEM**

At 3pm a tree has a shadow of 48 ft long, at the same time, a 6 ft tall person has a 15 ft shadow, how tall is the tree
*January 31, 2012*

**chemistry**

how do i know if the buffering capacity of a buffer solution is lost? Is that when after I add more of an acid or base to the solution that the pH eventually goes past + or - 1 of the original solution?
*January 30, 2012*

**chemistry**

How would you go about increasing the buffering capacity of a phosphate buffer? I know that the answer is that you should increase the concentrations of the acid and base equally or increase the total volume of the buffer solution. But can someone explain why this works? Thanks.
*January 30, 2012*

**history**

yes ma'am thanks
*January 25, 2012*

**history**

Do you think I should start with outline and then a few parafraphs on each/? Its not like i'm in college and thats alot of info Any advice on scaling it down? Like should i just pick one issue do you think? Sorry for the long posts
*January 25, 2012*

**history**

yes sir i mean yes ma'am lol typing to fast thankssssssss
*January 25, 2012*

**history**

Thanks Miss Sue! Is wikipedia all true? I remember someone telling me that anyone can add stuff there?
*January 25, 2012*

**history**

I need to write a paper on the history of civil rights in America starting in 1950. Any ideas on where to start in terms of research?
*January 25, 2012*

**math **

Ang and Meryl have a total of 2 model airplanes in their collection. Meryl has 6 moreplanes than Ang. Which equation could be solved to find a, the number of planes Ang has? a+6=24, a+6a=24, a-6=24, or a+a+6=24
*January 24, 2012*

**math**

what is equal to 12/40? 0.3%, 3%, 12%,or 30%
*January 24, 2012*

**Finite: College Math**

A student wants to buy 3 CDs, but assume that there are 6 CDs featuring the piano, 4 CDs featuring the trumpet, and 7 CDs featuring the saxophone. In how many ways can the selection be made if CD's featuring at least 2 different instruments are selected?
*January 20, 2012*

**math**

If the first World Series occurred in 1903 and the Yankees have played in 36 Series as of 2006, what percent of the Series have the Yankees played in since 1903?
*January 4, 2012*

**math**

If the first World Series occurred in 1903 and the Yankees have played in 36 Series as of 2006, what percent of the Series have the Yankees played in since 1903?
*January 3, 2012*

**chemistry**

By reference to Molecular orbital Theory and giving the appropriate MO diagrams explain why the bond in N2 is very strong short (bond dissociation entalpy 945 kjmol-1,bond length 109.8 pm) while that in O2 is weaker and longer (bond dissociation entalpy 497 kJ mol-1
*December 20, 2011*

**chemistry**

using VSEPR THEORY explain why 1)BF4- is a tetrahedral molecule 2)SF3+ is a Trigonal pyramidal molecule 3)ICI4- IS A SQUARE PLANER molecule 4IF5 IS A SQUARE pyramidal molecule 5)PF5 IS A TRIGNAL BIPYRAMIDAl
*December 19, 2011*

**math**

Estimate each product: 3.87 X 25=
*December 13, 2011*

**math**

One day is 86,400 seconds. Express this number in scientific notation and estimate how far the sun's light travels i a day.
*December 7, 2011*

**chem sorry the last one did not have the question**

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation: PCl5 (g) --------->...
*December 6, 2011*

**chem**

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation: PCl5 (g) --------->...
*December 6, 2011*

**chemistry**

i understood it when i was looking at the homework i did not check it so i reposed it. i did not mean to
*December 6, 2011*

**chemistry**

Now convert moles C3H8 to moles CO2. I have about 0.06. Convert moles O2 to moles CO2. I have about 0.02. Both answers can't be correct; the correct value in limiting reagent problems is ALWAYS the smaller value and the reagent providing that value is the limiting reagent...
*December 6, 2011*

**chemistry**

1 gram of C3H8 gas and 1 gram of O2 gas are delivered to a metal sphere with a fixed volume of 1 L. After the two gases are introduced, the two reactants are ignited and burned according to the balanced reaction: C3H8(g)+5O2(g)changes to 3CO2(g)+4H2O(g) After reaction, the ...
*December 6, 2011*

**chemistry**

A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
*December 6, 2011*

**chem**

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation: PCl5 (g) --------->...
*December 5, 2011*

**chem**

Two gas tanks containing compounds A and B are connected by separate valves to two ends of a 10 meter glass tube as shown below. When both valves are thrown open at the same time A and B travel down the tubes towards each other. A white line appears when they meet and b has ...
*December 5, 2011*

**chem**

A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
*December 5, 2011*

**chem**

A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ?
*December 5, 2011*

**chem**

A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
*December 5, 2011*

**chem**

A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ?
*December 5, 2011*

**chemistry**

A fixed amount of gas initially at 100 K and pressure P1 is expanded from 1 L to 100 L in a piston. The temperature, T2, of the gas at this point is 50 K. The piston is then locked at constant volume V2=100 L and half the gas is pumped out at a constant temperature of T2 . The...
*December 5, 2011*

**chemistry**

1 gram of C3H8 gas and 1 gram of O2 gas are delivered to a metal sphere with a fixed volume of 1 L. After the two gases are introduced, the two reactants are ignited and burned according to the balanced reaction C3H8(g)+5O2(g)changes to3CO2(g)+4H2O(g) After reaction, the ...
*December 5, 2011*

**chemistry**

The valve between a 5 liter tank in which the gas pressure is 911.925 kPa and a 10 liter tank containing gas at 4560 torr is turned open and equilibrium is established at constant temperature. What is the final pressure in the two tanks in atmospheres?
*December 5, 2011*

**physics**

Consider the 671 N weight held by two cables shown below. The left-hand cable had ten- sion T2 and makes an angle of 47 with the ceiling. The right-hand cable had tension T1 and makes an angle of 43 with the ceiling. a) What is the tension in the cable labeled T1 ...
*December 3, 2011*

**physics**

1.1sin47 + t2sin43 = 671 .804 + t2sin43 = 671 t2sin43 = 670.196 t2 = 982.694 Im really getting frustrated with this and its due at 11 pm tonight. Please help me. Is t1 right though??
*December 3, 2011*

**physics**

t1cos47 + t2cos43 = 0 t1cos47 = t2cos43 t1 = 1.1 t1sin47 + t2sin43 = 671 t2sin43 = 490.7 t2 = 719.6 I really have no idea how to do this
*December 3, 2011*