Thursday

September 3, 2015
Total # Posts: 1,149

**AP Physics**

A passenger train is traveling at 27 m/s when the engineer sees a freight train 345 m ahead of his train traveling in the same direction on the same track. The freight train is moving at a speed of 5.9 m/s. (a) If the reaction time of the engineer is 0.36 s, what is the ...
*August 15, 2015*

**AP Physics**

A motorcycle officer hidden at an intersection observes a car driven by an oblivious driver who ignores a stop sign and continues through the intersection at constant speed. The police officer takes off in pursuit 1.56 s after the car has passed the stop sign. She accelerates ...
*August 15, 2015*

**Urgent math**

SORRY 35th term would be 4 + 5(35-1) = 4 + 5(34) = 4 + 170 = 174
*August 15, 2015*

**Urgent math**

(a) What this means is, we are trying to find one number that is added or subtracted from each term to get the next term. Since this is an arithmetic sequence, the d will always be the same. You can find d by subtracting the first term from the second term (9-4) and getting d...
*August 15, 2015*

**calculus**

Sketch the region in the first quadrant enclosed by y=6/x, y=2x, and y=.5x. Decide whether to integrate with respect to x or y. Then find the area of the region. need final area as answer please, and step would be helpful also if you can post.
*July 19, 2015*

**calculus**

Sketch the region in the first quadrant enclosed by y=6/x, y=2x, and y=.5x. Decide whether to integrate with respect to x or y. Then find the area of the region.
*July 18, 2015*

**calculus**

Sketch the region in the first quadrant enclosed by y=6/x, y=2x, and y=12x. Decide whether to integrate with respect to x or y. Then find the area of the region.
*July 18, 2015*

**calculus**

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. y=3+√X, y=3+1/5x What is the area?
*July 14, 2015*

**introduction to computers**

which selection below represents an entry that would be seen in the active box? A. =sum(A1:A3) B. 15 C. (A1:A4) D. E11
*July 12, 2015*

**math/algebra**

why did the kangaroo see a psychiatrist?
*June 29, 2015*

**Statistics**

brewery's filling machine is adjusted to fill bottles with a mean of 33.8 oz. of ale and a variance of 0.004. Periodically, a bottle is checked and the amount of ale noted. (a) Assuming the amount of fill is normally distributed, what is the probability that the next ...
*June 20, 2015*

**Urgent - physics**

Air molecules and dust particles in the atmosphere will scatter sunlight. From a consideration of the position of the sun, estimate the direction of incidence of the sun's rays on the atmosphere. In what direction will an observer on the earth's surface need to look if...
*June 10, 2015*

**physics**

How would you use a piece of Polaroid to look at the bottom of a pond if reflections are a problem? Would it be any different if the pond is covered with a layer of oil? Hint: (Refractive index of water = 1.33 and of oil = 1.5). Show calculations.
*June 10, 2015*

**Chemistry**

A chemist wants to make 150 mL of a 1.26 M solution of carbonic acid to be used in the lab. How many grams of H2CO3 does the chemist need to make this solution? I converted mL to .150L, multiplied .150*1.26= =0.189 to get mol. H2CO3=62.028 so I multiplied this by 0.189 to get ...
*June 6, 2015*

**Language Arts**

Can someone please check these answers I cant risk getting a bad grade at this point. These are from the book "The Giver" 1. At the beginning of the novel, Jonas describes himself as apprehensive. Why is he apprehensive? A. An unknown plane is flying overhead. B. The...
*June 5, 2015*

**Chemistry**

what volume of 0.200M KOH is needed to neutralize 32.7 grams of h3po4, which has been dissolved in 250 ml water?
*June 4, 2015*

**Math (Grade 9)**

A submarine travels 16km/h on the surface of the water and 10km/h under water. The sub covers 138km in 12 hours. I) Write 2 equations to represent; (Define Variables) total number of hours: Total distance travelled. II) Use equations to calculate the spent on the surface and ...
*June 3, 2015*

**Chemistry**

At home, you dissolve 26.0 g of AlCl3 in 1.5 kg of water. What is the freezing point of this solution? (Normal f.p = 0.0 C, Kf= 1.86 C kg/mol)
*May 4, 2015*

**chemistry**

How many sigma (σ) bonds and pi (π) bonds are in one molecule of arsenic acid, H3AsO4
*May 2, 2015*

**physics**

A box is suspended by a steel wire via a frictionless pulley The wire has a mass per length of µ = 24.5 × 10 − 3 kg/m. The box is so heavy and the wire so thin that the mass of the wire does not influence the wire tension. The horizontal part of the wire has ...
*April 16, 2015*

**physics**

Did you examine the picture? There are angles involved. The nail is at a 30 degree angle in the wood.
*April 7, 2015*

**physics**

Thank you very much. That makes sense. I will apply that reasoning.
*April 7, 2015*

**physics**

The web address is posted below my question if you would like to see the picture. The (dot)=.
*April 7, 2015*

**physics**

The instructor wants us to use the sum of the torques to figure out the problem.
*April 7, 2015*

**physics**

Yes. Still need help figuring out the forces exerted though.
*April 7, 2015*

**physics**

The figure below shows a clawhammer as it is being used to pull a nail out of a horizontal board. A force of magnitude 130 N is exerted horizontally as shown. (NOTE: Assume that the force the hammer exerts on the nail is parallel to the nail and perpendicular to the position ...
*April 7, 2015*

**math**

given that the rectangle above has a perimeter of 34 units, find m<klj. round the answer to the nearest hundredth
*March 31, 2015*

**physics**

A penny is dropped from the top of a building 310 m high. Ignoring air resistance, if the penny falls straight down, with what speed would it hit the ground?
*March 25, 2015*

**Calculus**

∫ x^3 √(16-x^2) dx evaluated between [0, 4] I know this is solved using trigonometric substitution, but I'm not sure how to work it. Please show steps so I will understand.
*March 14, 2015*

**physics**

a) w= (2pi rad)/60 sec = .105rad/s b) v= wr = .105*24 = 2.52cm/s c) a= 0 rad/s^2
*March 5, 2015*

**physics**

a) w= (2pi rad)/60 sec = .105rad/s b) v= wr = .105*24 = 2.52cm/s c) a= 0
*March 5, 2015*

**World History**

can u delete this please
*March 5, 2015*

**World History**

1. What is Social Darwinism and how was it tied to imperialism? Social Darwinism is the belief of “Survival of the Fittest”. During the struggle between nations there were different factors that went into how you were treated like your ranking in society and your ...
*March 5, 2015*

**World History**

What is Social Darwinism and how was it tied to imperialism?
*March 5, 2015*

**World History**

9. In which colony did the United States have control over to make them an imperial power? a. Vietnam b. Philippines c. India is it b?
*March 5, 2015*

**World History**

6. Which form of resistance to British rule in India was MOST effective? a. Non-violent civil disobedience under Mohandas Gandhi b. Sepoy Rebellion ****** c. Pressure from foreign powers 7. European nations used two types of rule, indirect and _________ to control their new ...
*March 5, 2015*

**World History **

4. What was a consequence of British imperial rule in India? a. Indian culture exceled and the people of the country became wealthy. b. Indian people were massacred in Jallianwala Bagh and their culture decimated. c. Gandhi became a prominent leader for the British. 5. Which ...
*March 5, 2015*

**World History**

is it A?
*March 5, 2015*

**World History **

3. Nationalism is… a. Pride in one’s country especially marked by a belief in the superiority over other countries b. Policy of cooperation between nations to expand trade c. Diplomatic strategy to promote exploration I think I know it, but I wanna make sure. what do...
*March 5, 2015*

**World History **

1. Competing among nations to gain foreign territory and influence is the definition of ___________. a. nationalism b. realism c. imperialism I think it's c
*March 5, 2015*

**civics**

hi i need help on the cold war? and world war 2? what happen in the cold war and world war 2
*March 3, 2015*

**gen chem**

What is the ph of a soulution made by adding 0.20 mole NH3(aq) to 0.30 mole NH4Cl and 0.10 mole KOH to 100ml of water? Kb for NH3 (aq)=1.8x10^-5M
*March 1, 2015*

**math**

The accompanying tree diagram represents a two-stage experiment. (Let x = 0.3, y = 0.7, r = 0.55, s = 0.45, t = 0.55, and w = 0.45.) (a) Find P(A) · P(D | A). Correct: Your answer is correct. (b) Find P(B) · P(D | B). Incorrect: Your answer is incorrect. (c) Find...
*February 24, 2015*

**English**

Is This Parallel? Either you can eat or talk, but you can't do both at the same time.
*February 24, 2015*

**Math**

42x1/3=14 each girl received twice as many tickets or (2x) 14 girls(2x)=840 28x=840 x=30 per girl 15 per boy
*February 19, 2015*

**Math**

john and Julia are playing a game of darts. For each round, eqch of them throws exactly one dart and receives the number of points indicated in region of dartboard where the dart lands. Just after the first round , the dartboard looks like the diagram above. The players are ...
*February 12, 2015*

**Physics-Electricity**

A toaster consists of 4 heating elements that are connected in parallel. The toaster is connected to a 240 V mains supply. When the toaster is switched on, a current of 2.5 A is drawn from the mains supply. Calculate the electrical energy used by a single heating element in ...
*February 11, 2015*

**Programming **

The following is the Ticket for ABOOD Bus service Passenger’s Names: Going to: Date of issue: Report time: Seat no: Fare: Date of travel: Departure time: Bus no: Write a program to generate tickets for 30 passengers and save these tickets in an output document file Hints...
*February 3, 2015*

**Thermodynamics**

thanks i got it in the end
*February 1, 2015*

**Thermodynamics**

what is Tinitial for which?
*February 1, 2015*

**Thermodynamics**

A 196-g aluminum calorimeter contains 530 g of water at 19.8° C. Aluminum shot with a mass equal to 273 g is heated to 100.0° C and is then placed in the calorimeter. Find the final temperature of the system, assuming that there is no heat transfer to the surroundings.
*February 1, 2015*

**Algebra Rearrangement**

Ah ok thank you :)
*January 24, 2015*

**Algebra Rearrangement**

Please rearrange h=rx^2-tx to make x the subject.
*January 24, 2015*

**Math**

Adrian jogs 3/4 mile each morning how many days will it take him to jog 3 miles what do you do
*January 20, 2015*

**Chemistry**

A solution contains 23.1 ppm of dissolved Fe(NO3)3 (241.860g/mol), which dissociates completely into Fe3+ and NO3- (62.005g/mol) ions. Find the concentration of NO3- in parts per million
*January 9, 2015*

**Chemistry**

What is the equilibrium molarity of chloride if 19.6g of CaCl2 (110.984g/mol) is dissolved in water and diluted to 0.500L?
*January 9, 2015*

**math**

Emily spent 1/2 of her money at the store. Then she spent 1/2 of what was left at the bakery. next she spent 1/2 of what was left at the music store. She spent the remaining$6.00 at school. How much money did Emily start with?
*December 9, 2014*

**trigonometry**

At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle does the parent ...
*December 7, 2014*

**physics**

Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 4.55 x 1012 Hz, and the amplitude is about 2.69 x 10-11 m. For a typical atom, what is its (a) maximum speed and (b) maximum acceleration?
*November 30, 2014*

**Physics**

A 2.00kg solid sphere of radius 5.00cm rolls down a 20 degrees inclined plane starting from rest. (a) What is the magnitude of the acceleration of the center of mass of the sphere? (b) How far down the plane does it roll without slipping in 1.00s?
*November 29, 2014*

**Math**

A bag contains 10 white balls and 6 yellow balls. We need to add 112 balls to the bag and keep the ratio the same. How many of each do we need to add. - What's the correct formula to use?
*November 25, 2014*

**physics**

In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70kg steps on the end of a 50cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?
*November 23, 2014*

**Calculus Help**

Ha.. I was just using a old fashion calculator and hoping I could do the rest in my head. But thanks I think I understand now. =D
*November 16, 2014*

**Calculus Help**

If f(x) = sin(7 − 5x), find f′(π), which is the derivative at π: −0.754 −0.657 0 0.657 3.770 I chose 0.657 ... I did not really get this exact answer, its just that while I was trying to figure this out my answer was actually 0.6978 but I just...
*November 16, 2014*

**Economics**

If stores are charging the same prices for their merchandise, what techniques might each one adopt to differentiate its products and services from the others? What kind of competition does this illustrate?
*October 30, 2014*

**math**

After the thousandth visitor, the rooms that the light switches are still on are the ones that the numbers are a perfect square. For example, room number 4, 9, 16, 25, and 36 will all be on.
*October 20, 2014*

**AP Chemistry**

Which of the following sets of quantum numbers are allowed for an electron in a hydrogen atom? a)n=3, l=0, ml=0 b)n=4,l=1,ml=-1 c)n=2,l=1,ml=-2
*October 19, 2014*

**Chemistry**

7. The specific heat of wood is 2.03 J/g∙°C. How much heat is needed to convert 550. g of wood at -15.0°C to 10.0°C?
*October 18, 2014*

**Chemistry**

Calculate the number of moles in 8.50x1015 atoms of 4He.
*October 1, 2014*

**Algebra 2**

Thanks I hope it's right
*September 24, 2014*

**Algebra 2**

Without graphing, identify the verx, axis of symmetry, and transformations from the parent function f(x)= absolute value of x y= 4- absolute value of x-2
*September 24, 2014*

**Calculus**

A sinusoidal section is to be built as part of a roller coaster track. The high point is h=27 m at a horizontal distance d=0 m. It has a low point at h=-3 m at d=50 m. a. Write an equation expressing h in terms of d. b. The lengths of the horizontal timbers used to build the ...
*September 23, 2014*

**Calculus**

Scorpion Gulch and Western Railway are preparing to build a new line through Rolling Mountains. They have hired you to do some calculations for tunnels and bridges needed on the line. You set up a Cartesian coordinate system with its origin at the entrance to the tunnel ...
*September 23, 2014*

**Calculus**

A spacecraft is in an elliptical orbit around the earth. At the time t=0 hours, it is at its apogee (highest point), d=1000 km above the earth's surface. It is at its perigee (lowest point) d=100 km above the surface 50 minutes later. a. Assuming that d varies sinusoidally...
*September 23, 2014*

**Calculus**

At a certain point on the beach, a post sticks out of the sand, its top being 76 cm above the beach. The depth of the water at the post varies sinusoidally with time due to the motion of the tides. The depth d is modeled by the equation d=40+60cos(pi/6(t-2)) where t is the ...
*September 22, 2014*

**Algebra**

Given a point (-2,5determine a point that satisfies the specified symmetry. 1. Origin 2. y-axis 3. x-axis 4. y=x
*September 22, 2014*

**c**

Lets think of the situation. It doesn't tell you how big the pool but you can make up a value. To make it easier use a number that it a multiple of both 4 and 9. In this case it would be 36. Okay say the pools need 36 gallons of water to be full. To find the rate for each ...
*September 16, 2014*

**Physics **

A light bulb is placed 21.7 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 4.60 cm closer to the mirror. Calculate the focal length of the concave mirror.
*September 11, 2014*

**Math**

I need help
*September 3, 2014*

**spanish please check!**

Form complete sentences using the information provided. Use the preterite tense of the verb. 1. ir / al / semana / pasada / yo / dentista / la ______________________________________________________________ 2. parque / Pablo / y / correr / perro / su / por / el ...
*August 25, 2014*

**spanish please check!**

Yo fue al dentista la semana pasada Pablo corrio el perro y su por parque ellos leyo periodicos tres cada dia Dona Rita supo la historia de nunca la verdad
*August 25, 2014*

**Spanish**

complete sentences using the information provided. Use the preterite tense of the verb. 1. ir / al / semana / pasada / yo / dentista / la 2. parque / Pablo / y / correr / perro / su / por / el día / leer / ellos / periódicos / tres / cada 4. nunca / la historia...
*August 25, 2014*

**Algebra**

If p(x) is a polynomial and is divided by (x-k) and a remainder is obtained, then that remainder is p(k). If the quadratic p(x)=x^2-3x+5 gives the same remainder when divided by x+k as it does when divided by x-3k find the value of k, k is not equal to 0. This is the answer ...
*August 2, 2014*

**Logarithms**

Ah I get it now thank you! :)
*August 1, 2014*

**Logarithms**

How is log(a/bc) the same as log(a) - log(b) - log(c). Should it not be '+ log (c)'?
*August 1, 2014*

**Spanish use of Imperfect Verbs**

Sorry we are supposed to write about our vacation in an overseas country using past,present and future tenses. As long as we use the Imperfect, Preterite etc. in the right places, it's fine.
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Here's my edited version: ¡Hola mis amigos y familias, me llamo Nick y soy en Miravida Soho en Buenos Aires, la ciudad mayor de la Argentina! Yo he estado en Sudamérica con mi familia pero no he ido nunca a Argentina. Mis compañeros de viajes vieron de ...
*July 26, 2014*

**Spanish use of Imperfect Verbs**

And I would like to give you some advice as 'me gustaría os dar/daros algunos consejos'?
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Thanks for all the help! Just a quick question, would you say "But before I finish" as 'pero antes yo termino' or is there another way?
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Can someone please check if I've used the Imperfect correctly? Thank You :) ¡Ola mis amigos y familias, me llamo Nick y soy en Miravida Soho en Buenos Aires, la ciudad mayor de Argentina! Mis compañeros de viajes y yo pasamos un buen rato hoy. En la mañ...
*July 26, 2014*

**Spanish**

Can someone please just proof-read this? Especially the use of the imperfect and por/para. And don't worry about punctuation :) ¡Ola mis amigos y familias, me llamo Nick y soy en el hotel primero de Buenos Aires, la ciudad mayor de Argentina! Mis compañeros de...
*July 25, 2014*

**Books**

I didn't even think that theme was a sociological one (I'm still only in high school), that theme is just something I thought up of. And yes, my teacher said we are allowed to do fictional texts. In fact, any text at a high enough reading level is appropriate. I don&#...
*July 17, 2014*

**Books**

They're actually visual texts. One is the TV series Marvel's Agents Of Shield and the other one is the movie Dawn of the Planet of the Apes. Our teacher said to have a mixture of both written and visual but I can't think of any that would include that theme.
*July 17, 2014*

**Books**

I'm doing a paper in which I have to write about 4 texts and their connection to a theme. I already have 2 and am looking for 2 more texts. My theme is "How one can never lose his roots, no matter how much influence society has on him", or something similar. ...
*July 17, 2014*

**statistics**

assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with a mean of 79 and a standard deviation of 7.1?
*July 14, 2014*

**mqr/117**

Select the x-coordinate of the vertex of the parabola defined by the function f(x)=5x^2+3x+1
*July 13, 2014*

**Spanish**

Next week I will be in Mendoza, after spending some time in Salta. There I will drink some of their famous wines and see the historical sights. Then I’ll come back home from El Plumerillo Airport! Argentina is a beautiful country, but there can be thefts and hooliganism. ...
*July 7, 2014*

**Spanish**

Sorry for the late reply. This is the stuff I want to talk about. I realize this is a lot so some bits will be cut out. I’m in Salta now on day 5 of my 11-day tour of northern Argentina. I arrived at Rio Gallegos International Airport early Monday morning and got picked ...
*July 7, 2014*

**Spanish**

Thanks but that's just what we need to include. I was wondering if someone could provide me with sentence starters in spanish because we haven't worked on this in class at all, so they would at least give me an idea as to how to write my speech
*July 7, 2014*

**Spanish**

Our spanish class has been given a 1-minute speech to write up over the holidays, but our teacher hasn't provided us with any extra material we can use. I was wondering if you could give me sentence starters etc. to help me work on it. Here is the scenario: (my chosen ...
*July 7, 2014*