Friday

July 31, 2015

July 31, 2015

Total # Posts: 6,757

**physics**

A person exerts a force of 6.0 N at a point which is 90 cm from the hinged side of a door. If the torque is 5.2 N m then determine the angle between the force vector and the line that runs directly from the point to the hinged side.
*December 11, 2012*

**Chemistry**

please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O
*December 10, 2012*

**AP PHYSICS HELP**

One piston of a hydraulic lift holds 1.40*10^3 kg. The other holds an ice block (density= 917 kg/m^3) that is 0.076 m thick. Find the first piston's area. (Cross sectional area of the ice block = cross sectional area of the piston).
*December 10, 2012*

**math**

we decided on a new logo for t-shirt,it was to be 3 stripes,each stripes could be one of 2 different colors,how many different logos could we make
*December 10, 2012*

**Physics**

In Figure 9-61, block 1 (mass 2.0 kg) is moving rightward at 8 m/s and block 2 (mass 4.8 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1180 N/m is fixed to block 2. When the blocks collide, the compression of the spring ...
*December 10, 2012*

**AP PHYSICS HELP**

Thanx!!!!
*December 10, 2012*

**AP PHYSICS HELP**

A 1.47 x 10^6 kg steel hull has a base that is 2.5 x 10^3 m^2 in area. If it is placed in sea water (density= 1025 kg/m^3), how deep does the hull sink?
*December 10, 2012*

**psychology**

social
*December 10, 2012*

**science**

Consider a single electron in a 1dimensional box with size a, What is the expected position <x> of the electron at the second excited state? What is the expected value of linear momentum at the ground state ?
*December 8, 2012*

**Life Science**

Name one plant and one animal that previously lived in Antarctica, but are now extinct throughout the entire world.
*December 7, 2012*

**Reading**

Can anyone help me with 12?
*December 7, 2012*

**Math**

When (5x^6+10x^5+2x^4+19x^3+2x^2+1)^10000 is multiplied out, what is the coefficient of x^4?
*December 6, 2012*

**math**

idk
*December 5, 2012*

**math**

anser it
*December 3, 2012*

**math**

What is the degree of the polynomial -2?
*December 3, 2012*

**college physics**

191.1
*December 3, 2012*

**Physics**

A skateboarder enters a ramp at 5 m/s, skates down it and exits at 14 m/s. What was the Height of the ramp? A. 8.7 m B. 85.5 m C. -1.2 m D. 3m E. 1.2 m Pls show work !
*December 3, 2012*

**Physics**

The work required to bend a steel beam with a spring constant of 10^6 n/m is 5 j. If it is treated like a perfect spring, what is the displacement of the beam? A. 3.2 mm b. .03 m C. 2.5m D. 0.026 m e. 0 Pls show work thank u!
*December 3, 2012*

**Physics**

A block with a mass of 2.5 kg on a frictionless track collides and sticks to a stationary block with a mass of 1.75 kg and the two more together at a velocity of 3.5 m/s. What was the velocity of the first block? A. 2.5 m/s B. 7.5 m/s C. 6.0 m/s D. 0.6 m/s E. 0 m/s pls show ...
*December 3, 2012*

**Chemistry**

What volume (in mL) of 0.45 M Na2SO4 solution is needed to precipitate all the barium, as BaSO4(s), from 14.5 mL of 0.15 M Ba(NO3)2 solution? Ba(NO3)2(aq) + Na2SO4(aq)= BaSO4(s) + 2 NaNO3(aq)
*December 2, 2012*

**Chemistry**

Never mind. I got it
*December 2, 2012*

**Chemistry**

How many grams of CuCl2 are required to prepare 1270. g of a 1.75% (by mass) CuCl2 solution?
*December 2, 2012*

**statistik**

you'er gay just to learn it own your own
*December 2, 2012*

**Chemistry**

What's the linear density of body center cubic (0,1,1)of Molybdenum
*November 29, 2012*

**chemistry**

How would you prepare the following solution? a)2% NaCL(w/v) b).35M glucose C)0.12M CaCl2 For b I got glucose 0.35=wt/180=63gm/L, but not sure if I'm doing it right.
*November 29, 2012*

**Physics 1**

A catapult 100 m long launches a 3.0 x 10^4 kg jet from the deck of a carrier. Starting at rest, the plane takes off with a speed of 80 m/s. Find: a)The acceleration, b) the average force, c) the work done, d) time to accelerate , e) the power developed.
*November 28, 2012*

**Pre-calculus**

what does sqrt mean?
*November 27, 2012*

**Pre-calculus**

You are given a 12"x18" piece of construction paper. You are to cut a square out of each corner in order to create a 3-dimensional open-top box. What size squares would you need to cut in order to maximize the volume of the box?
*November 27, 2012*

**physics**

tyvm :)
*November 27, 2012*

**physics**

Air consists of molecules of several types, with an average molar mass of 28.95 g. An adult who inhales 0.6 L of air at sea level takes in about how many molecules? (The density of air is 1.229 kg/m^3, and the molar mass of air is 28.95 g/mol.)
*November 27, 2012*

**math**

4x+3=15
*November 26, 2012*

**math**

write a situation with a algebraic exprassion that can reprsened x+3
*November 26, 2012*

**Science**

A car speeds over the top of a hill. If the radius of curvature of the hill at the top is 14.27 m, how fast can the car be traveling and maintain constant contact with the ground?
*November 26, 2012*

**MATH PLEESE HELP ITS URGENT**

A is 11 by 11 B is 11 by 13 c is 13 by 13 total area is 433 m2 area of B is 143 m2 total perimeter is 96 m
*November 26, 2012*

**Chemistry**

How many moles of CO2 would be expected to be produced from 0.00639 moles of sodium carbonate?
*November 26, 2012*

**physics**

A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 195-kg laser sensor which measures the thickness of the ice (see the drawing). The helicopter and the sensor move only in the horizontal direction and have a horizontal acceleration of ...
*November 25, 2012*

**question about making reference**

i'm completely lost. the only thing i found helpful is this. "For multiple articles by the same author, or authors listed in the same order, list the entries in chronological order, from earliest to most recent." still i dont have any idea.
*November 25, 2012*

**question about making reference**

forgot to add. i'm using APA style
*November 25, 2012*

**question about making reference**

what is the right way to cite this? all the info comes from 1 book but different pages. Martin Kantor (2003). Distancing: Avoidant Personality disorder. Road West, Westport: Praeger publishers. Pp. 13-14. Martin Kantor (2003). Distancing: Avoidant Personality disorder. Road ...
*November 25, 2012*

**chemistry**

75g of FeCL3 are dissolved in 700 mL of solution, what is the concentration of Fe3+ ions? what is the concentration of Cl- ions?
*November 25, 2012*

**physics**

A duck has a mass of 2.70 kg. As the duck paddles, a force of 0.130 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.210 N in a direction of 52.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....
*November 25, 2012*

**physics**

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.46 x 105 m/s to a final velocity of 2.25 x 106 m/s while traveling a distance of 0.0803 m. The ...
*November 25, 2012*

**physics**

An airplane has a mass of 3.41 × 104 kg and takes off under the influence of a constant net force of 2.57 × 104 N. What is the net force that acts on the plane's 78.8-kg pilot?
*November 25, 2012*

**English and grammar**

i need someone to check my work but i cant just copy it and paste it here. i need to send it via e-mail. please give me your email add and ill send it to you. thanks
*November 25, 2012*

**alebra**

9,040,000,000
*November 24, 2012*

**maths**

differentiate x^2ex^2 W.R TO X
*November 24, 2012*

**English and Grammar**

I choose to do research on Avoidant personality disorder or APD because a friend of is suffering from APD and I’m having trouble how to approach him. My friend’s name is Jim. He told me that he started to feel the symptoms when he was in his teen age years. Jim told ...
*November 23, 2012*

**English and Grammar**

first draft of my report and i need help in improving this. i didnt made up all the information here all comes from a book. Dissociative identity disorder is defined in the DSM-IV-TR as the presence of two or more personality identities that repeatedly take control of one’...
*November 23, 2012*

**Algebra II**

so x would = 3?
*November 20, 2012*

**Algebra II**

Find the x-value at which y=2x+5/x-3 is undefined.
*November 20, 2012*

**Algebra II - Word Problem**

A convenience store clerk can wait on 6 customers per minute. If customers arrive at an average rate of x people per minute, the time T spent in line is: T=1/6-x, where 0<x<6 Find the waiting time if an average of 4.75 people arrive each minute.
*November 20, 2012*

**math**

those are 0 in the question not θ
*November 20, 2012*

**math**

P: Solve each to four decimal places (x real and 0 in degrees) 5 cos x - 2 = 0, 0<orequalto x < 2pi
*November 20, 2012*

**Chemistry114**

The air in a cylinder with a piston has a volume 220 ml and pressure of 650 mm hg. If the pressure inside the cylinder increase to 1.2 atm. what is the final volume of the cylinder? Complete the following data table.
*November 19, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 18, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 18, 2012*

**Chem**

. Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. A. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3? Show your solution. B. Discuss at least three potentially ...
*November 17, 2012*

**Chemistry**

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
*November 17, 2012*

**chemistry**

If 45 colonies grew on the filter and 1 mL of a 10-5 dilution of the sample was filtered, how many coliform bacteria were in 100 mL of the original sample?
*November 16, 2012*

**math**

9:4 dude hope i helped =]
*November 16, 2012*

**math**

Paul's Pizzeria sells 45 cheese pizzas and 20 pepperoni pizzas each week. What is the ratio of cheese pizzas to pepperoni pizzas sold each week by Paul's Pizzeria?
*November 16, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 16, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 16, 2012*

**math**

Sin(2x)=2sin(x)cos(x) find the exact value in radians with 2sin^2(x)+sin^2(x)=0, i really do not get this question or even how to do this ive been trying to figure it out but cant
*November 16, 2012*

**math**

Sin(2x)=2sin(x)cos(x) find the exact value in radians with 2sin^2(x)+sin^2(x)=0, i really do not get this question or even how to do this ive been trying to figure it out but cant
*November 16, 2012*

**physics**

When archer pulls an arrow back in his bow.He is storing potential energy in his bow What avg force must the archer exert if he pulls the string back a distance of 30 cm?
*November 15, 2012*

**english(quotes)**

The identity you stand up for can enslave you and close you to the rest of the world. -Murathan Mungan What does this quote mean?
*November 15, 2012*

**Algebra II - Word Problem**

If a car is traveling downhill at 45 miles per hour on dry pavement, then the braking distance B is B = 45/(0.4+m), where m<0 is the slope of the road. Find the slope of the road if the braking distance is 125 feet.
*November 15, 2012*

**Algebra II - Word Problem**

I'm guessing it's 48 seconds, but not sure... Thanks!
*November 15, 2012*

**Algebra II - Word Problem**

A convenience store clerk can wait on 6 customers per minute. If customers arrive at an average rate of x people per minute, the time T spent in line is T = 1/(6-x), where 0<x<6 Find the waiting time if an average of 4.75 people arrive each minute.
*November 15, 2012*

**physics**

NEVERMIND I GOT IT
*November 15, 2012*

**physics**

A body of mass m is attracted to a 11 kg mass 31.2cm away with a force magnitude of 6.42 x 10^-8 Find m? I am having trouble with the algebra getting m by it self just show me the steps if you can
*November 15, 2012*

**Chemistry**

37.5 x .152 / 25
*November 15, 2012*

**Algebra II**

A runner completes a 16 mile trip, running 8 miles uphill and 8 miles downhill in a total of 4 hours, if his uphill speed is 3 mph slower than his downhill speed, find his downhill speed.
*November 15, 2012*

**Statistics**

One event A is _________________ of another event B if the probabilty of event A has occurred given event B is the same as the probability that A will occur with no knowledge of B. disjoint mutually exclusive dependent independent
*November 15, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 15, 2012*

**math**

Yes Kate is right. ur sexy too jk
*November 14, 2012*

**Science**

Chl has an absorbance peak at 435nm (Soret band) and a peak at 665nm (Qytransition). Calculate the energy gap (in Joules) between the ground and excited states of these two transitions.
*November 14, 2012*

**Physics**

An advertising firm has contacted your engineering firm to create a new advertisement for a local ice-cream stand. The owner of this stand wants to add rotating solid cones (painted to look like ice-cream cones, of course) to catch the eye of travelers. Each cone will rotate ...
*November 13, 2012*

**Finance**

United Technology Corporation (UTC) has $40 million of convertible bonds outstanding (40,000 bonds at $1,000 par value) with a coupon rate of 11 percent. Interest rates are currently 8 percent for bond of equal risk. The bonds have 15 years left to maturity. The bonds may be ...
*November 13, 2012*

**physics**

A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless sup- porting surface. The girl begins to walk along the plank at a constant speed of 1.87 m/s to the right relative to the plank. What ...
*November 12, 2012*

**physics**

A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless sup- porting surface. The girl begins to walk along the plank at a constant speed of 1.87 m/s to the right relative to the plank. What ...
*November 12, 2012*

**physics**

A(n) 775 N man stands in the middle of a frozen pond of radius 11.2 m. He is un- able to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.3 kg physics textbook horizontally toward the north shore, ...
*November 12, 2012*

**Statistics**

Which of the following statements about the correlation coefficient r are true? I. It is not affected by changes in the measurement units of the variables. II. It is not affected by which variable is called x and which is called y. III. It is not affected by extreme values. I ...
*November 12, 2012*

**Statistics**

Suppose a study finds that the correlation coefficient relating family income and SAT scores is r = +0.98. Which of the following are proper conclusions? I. Poverty causes low SAT scores II. Wealth causes high SAT scores III. There is a very strong association between family ...
*November 12, 2012*

**math**

Q) (Speed) Ahmed drives from Abu Dhabi to Dubai. The journey takes him 1 hour 30min and the distance covered is 130km. What is the average speed at which he was travelling (rounded to the nearest 1km/hr)?
*November 12, 2012*

**science**

What is meant by depassivation of reinforcement? State the two main chemical attacks that lead to depassivation
*November 11, 2012*

**Physics**

A file cabinet weighing 1500 N is at rest on the floor. The coefficient of static friction between the floor and the cabinet is 0.5. What is the minimum force required to make the file cabinet move horizontally
*November 10, 2012*

**science**

Abiotic factors
*November 10, 2012*

**math**

how do you go about doing place value puzzles .can you show me an example please(hundredths place,thousandths place,ones place and tenths place
*November 9, 2012*

**Math**

113.50 ? 114.50 ? 115.00
*November 8, 2012*

**physics **

A shopper in a supermarket pushes a loaded 32 kg cart with a horizontal force of 15 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 3.3 s, starting from rest? Answer in units of m
*November 8, 2012*

**Organic chemistry**

Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
*November 8, 2012*

**Chemistry**

Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
*November 8, 2012*

**Organic Chemistry**

chlorobutane, chloride ion is weaker leaving group
*November 8, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 8, 2012*

**Statistics**

New York and Pennsylvania have progressive toll roads. Upon entering the toll road the driver receives a ticket marking the location and time of entrance. Upon exiting the mileage is computed and the driver pays the toll. Which of the following would you expect to be true ...
*November 8, 2012*

**science**

Assume an average human cell has a cell cycle of 20 hours. Calculate how many cells there would be after 80 hours.
*November 7, 2012*