# sean

Popular questions and responses by sean-
## statistics

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal,

*asked on November 16, 2014* -
## English

Which of the following sentences demonstrates proper subject verb agreement? A. The boy or the girls come to school late B. The boys and girl visits my house C. The boys or the girls sing in the choir D. The boys and girl in our club is in the cafe.

*asked on February 24, 2018* -
## Physics

A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area. Ans: 1390 * 10^-8 N/m^2 -------- I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

*asked on December 24, 2009* -
## physics

Two people pull as hard as they can on ropes attached to a 200 kg boat. If they pull in the same direction, the boat has an acceleration of 1.44 m/s2 to the right. If they pull in opposite directions, the boat has an acceleration of 0.518 m/s2 to the left.

*asked on September 25, 2012* -
## Physics

a lunar landing module is descending to the moon's surface at a steady velocity of 10 m/s. At a height of 120m, a small object falls from its landing gear. Taking the moon's gravitational acceleration as 1.6m/s^2, at what speed, in m/s, does the object

*asked on November 16, 2006* -
## economics

1) Give an example that you believe demonstrates when the cost of government actions outweighs the benefits.Identify the factors that may cause the costs of government actions to outweigh the benefits. I'm confused what does that mean? Thank you for your

*asked on July 23, 2014* -
## AP English

Refer to the excerpt from "A Bachelor's Complaint of the Behavior of Married People". You can infer from the fifth sentence that "them" refers to a. wives b. husbands c. old friends d. sovereign princes e. friendships Fifth Sentence is: "With some

*asked on April 16, 2018* -
## Statistics (Poisson)

Cars arrive at a toll booth according to a Poisson process with mean 80 cars per hour. How long can the attendant's phone call last if the probability is at least .4 that no cars arrive during the call. The book's answer is 23 seconds. That doesn't match

*asked on July 19, 2009* -
## AP English

Refer to the excerpt from "A Bachelor's Complaint of the Behaviour of Married People." The phrase"as a sovereign Prince" in the third sentence of paragraph two is an example of which rhetorical device? a. an appeal to logic b. simile c. an appeal to

*asked on April 16, 2018* -
## Chemistry

what volume of .422 M NaOH must be added to .500L of .300 M acetic acid to raise its ph to 4.00 i know you have to use the henderson hasselbalch equation but im not sure which values i would use for the concentration portion of the equation. would i have

*asked on March 4, 2017* -
## History

How did Maryland's political status during the Civil War reflect that of other border states? President Lincoln suspended habeas corpus to keep Maryland in the union. Maryland was a slave state that remained part of the union. Most of the battles of the

*asked on May 6, 2019* -
## math

All the members of a construction crew work at the same pace. Six of them working together are able to pour foundation in 22 hours. How many hours would this job take if the number of workers: if the workers increased by the factor two

*asked on October 20, 2017* -
## Chemistry

which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

*asked on February 19, 2017* -
## Physics

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 353 K. If 25.0 J of work is done by the gas during this process, what is the mass of helium present?

*asked on May 13, 2011* -
## Reading

Which of the following can be used to find journal articles on a given topic? a. A handbook b. A style guide c. A periodical index d. An encyclopedia I think the correct answer is B style guide

*asked on February 24, 2018* -
## Physics

A mass of 0.55 kg attached to a vertical spring stretches the spring 36 cm from its original equilibrium position. The acceleration of gravity is 9.81 m/s2 . What is the spring constant? Answer in units of N/m.

*asked on January 12, 2015* -
## Chemistry

Determine the value of the equilibrium constant,Kgoal , for the reaction N2(g)+O2(g)+H2(g) (1/2)N2H4(g) + NO2(g) Kgoal=? by making use of the following information: 1.N2(g)+O2(g)2NO(g), K1=4.1010x10^-31 2.N2(g)+2H2(g)N2H4(g), K2=7.40x10^-26

*asked on March 31, 2013* -
## trig question...

During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the

*asked on July 12, 2011* -
## Math

Where does this infinite series converge: Sigma (k = 1 to infinity): 1/(9k^2 + 3k - 2)

*asked on March 18, 2009* -
## Science

Why does a balloon burst if you keep on blowing?

*asked on January 6, 2011* -
## CHEIMSRTY

Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base? I need help on this question. Please explain this to me!

*asked on March 14, 2010* -
## algebra

A square plot of land has a building 60ft long and 40ft wide at one corner. The rest of the land outside the building forms a parking lot. If the parking lot has area 12,000ft^2, what are the dimensions of the entire plot of land? The answer is 120ft by

*asked on September 2, 2009* -
## Math 102

A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents the number of red marbles in the sample. Looking for the expected value of X.

*asked on March 21, 2011* -
## Chemistry

50.0 mL of 0.18 M NH3 with 5.0 mL of 0.36 M HBr. Kb of NH3 is 1.77 x 10-5 Calculate pH I don't know where to begin

*asked on May 6, 2019* -
## Algebra

Select Yes or No to state whether each data set is likely to be normally distributed. Please help! the number of coupons used at a supermarket. --> I believe YES. the weights of the pumpkins that are delivered to a supermarket. --> I believe NO. the number

*asked on May 30, 2018* -
## Algebra

If a certain number is added to the numerator and denominator of 11/13, the result is 11/12. Find the number.

*asked on November 4, 2015* -
## Algebra 1

Seiji and Gavin both worked hard over the summer. Together, they earned a total of $425. Gavin earned $25 more than Seiji. !@#$%^& much did each of them earn? A. Write a system of two equations to model this program. I got 1 equation down, i just cant

*asked on January 23, 2015* -
## Chemistry

H2C2O4.2H2O(s) is primary standard substance. 2.3688g of oxalic acid hydrate were completely neutralized by 42.56ml of NaOH solution. Calculate the molar concentration of the NaOH solution. Write the balanced equation for the reaction.

*asked on April 1, 2013* -
## Physics

A basketball is thrown horizontally with an initial speed of 4.20 m/s. A straight line drawn from the point to the landing point makes an angle of 30.0 with the horizontal. what was the release height?

*asked on March 13, 2008* -
## Precalc

Find the exact solutions to each equation for the interval [0,360) 2cosx-secx = 1

*asked on December 6, 2007* -
## math

The area of a triangle is 600 square feet. Find the altitude, in feet, of the triangle if the length of the corresponding base is 30 feet.

*asked on March 26, 2015* -
## physics

A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the 1.0-kg cart with a constant 2.5-N force for 0.15m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart. By what amount does

*asked on October 23, 2014* -
## physics

A pellet gun is fired straight downward from the edge of a cliff that is 17 m above the ground. The pellet strikes the ground with a speed of 29 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

*asked on October 1, 2010* -
## math

The region between the graphs of x=y^2 and x=5y is rotated around the line y=5. What is the volume?

*asked on May 3, 2019* -
## biochem

For an enzyme that follows simple Michaelis–Menten kinetics, what is the value of Vmax if V0 is equal to 1 mmol minute−1 when [S] = 1/10 KM I keep getting 11 for the answer but the answer key in my book says 1.1 umol. what am i doing wrong?

*asked on October 15, 2018* -
## Physics

A liter of water is used to cool some electronics. If 1000 J of heat is given off by the electronics, by what temperature does the water increase? One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g °C). I can not get this..please help

*asked on April 26, 2015* -
## trig identities

Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2

*asked on May 8, 2013* -
## Chemistry

What effect on the molar mass of the unknown acid would each of the following have-that is-would it make the calculated molar mass high, low, or would it have no effect? 1. Adding 5 drops of phenolphthalein instead of 1 drop. 2. Using a standard NaOH

*asked on April 3, 2013* -
## MATH

a rectangular garden 9ft by 12 ft includes a uniform border of wood chips around a rectangular bed of flowers. If flowers take up half the garden's area. find the perimeter of the flower bed

*asked on February 16, 2013* -
## Physics

2. A pool has an area A = 50 m2 and depth h = 2.5 m. The pool is filled with water to the maximum height. An electrical pump is used to empty the pool. There are two pipes coming out the pump: one is submerged into water has a radius r1 = 4 cm the other

*asked on April 13, 2012* -
## Physics

A cord passes over a weightless and frictionless pulley. Masses of 200 g and 300 g are attached to the ends of the cord. Find the distance the masses will move during the 5th second after they are started from rest.

*asked on January 30, 2011* -
## Physics

A negative charge -Q is placed inside the cavity of a hollow metal solid. The outside of the solid is grounded. Q: Is there any excess charge induced on the inner surface of the piece of metal? A: Yes, +Q Q: Is there any excess charge on the outer surface

*asked on December 25, 2009* -
## Algebra

A class of 33 33 students elected a class treasurer. There were 11 11 votes for Candidate A and 15 15 votes for Candidate B. The remaining students did not vote. Which expression gives the percent of voters who voted for Candidate A?

*asked on October 9, 2019* -
## History

Which of these actions did President Lincoln take at the beginning of the Civil War? He declared martial law throughout the nation. He imprisoned congressional representatives from the South. He issued a declaration of war without the consent of Congress.

*asked on May 6, 2019* -
## math

You have been assigned to interface different sensors (displacement, vibration, pressure, temperature) to the ADuC847. More specifically, you have been assigned to design the antialiasing filters for the different analog input channels on the ADuC847

*asked on December 7, 2018* -
## Math

An aquarium tank holds 475 liters of water. How much is this in gallons? Use the following conversion: 1 gallon is 3.8 liters.

*asked on October 21, 2018* -
## AP English

Refer to the passage from Benedict de Spinoza's On the Improvement of the Understanding, translated by R.H.M. Elwes. The last sentence in the passage is: 1. A summary of a main idea in the passage 2. An example that illustrates a hypothesis 3. A transition

*asked on May 22, 2018* -
## College Algebra

The function w(x) = -0.01x² + 0.27x + 8.60 can be used to estimate the number of self-employed workers in America in millions, x years after 1980. For what years were there (or will be there) 9.7 million self-employed worker in America?

*asked on April 23, 2015* -
## Physics

A cannon is fired at 30 degrees above the horizontal with a velocity of 200 m/s from the edge of a 125 m high cliff. Calculate where the cannonball lands on the level plain below.

*asked on January 18, 2015* -
## algebra

The ratio of the lengths of strings that play the notes D and B (on a guitar), is 27 to 16. If a string 64 cm long plays B, what is the length of the string that plays a D?

*asked on June 12, 2014* -
## Trigonometry

verify the identity: 1- (cos^2x)/(1-sinx)= -sinx

*asked on May 30, 2011* -
## physics

A student (m = 68 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the

*asked on November 10, 2010* -
## CHEMISTRY

Which of the fallowing compounds may be Arrhenius acids: CH4, SO2, H2S, Ca3(PO4)2 Can you please explain how you got the answer because I don't understand how you can tell.

*asked on March 14, 2010* -
## Physics

14. Which of the following wavelengths will produce standing waves on a string that is 3.5 m long? a. 1.75 m b. 3.5 m c. 5.0 m d. 7.0 m

*asked on October 28, 2009* -
## college sociology

why do you think such communities get little attention from the U.S. mass media ?

*asked on June 30, 2009* -
## History

To determine how many Electoral College votes a state has, which of the following would you need to know? a. The number of Democratic and Republican voters in that state b. The state's population and the number of registered voters in that state c. The

*asked on May 7, 2020* -
## Math (Urgent!)

Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p , where 0

*asked on October 2, 2018* -
## AP English

The author uses the indefinite pronoun something in the first sentence because: a. he wants to hook the reader with the ambiguity b. he's imprecise in his thinking c. his style is academic and purposefully obscure d. he does not know yet what the

*asked on May 22, 2018* -
## AP English

The fourth sentence in "A Bachelor's Complaint of the Behaviour of Married People" (I have scarce a married friend of my acquaintance, upon whose firm faith I can rely, whose friendship did not start after the period of his marriage.) is an example of: a.

*asked on April 16, 2018* -
## Chemistry

Given the following reaction for photosynthesis, 6CO2 + 6H2O --> C6H12O6 + 6O2, how many liters of O2 can be produced from 100 g of water at standard temperature and pressure?

*asked on February 27, 2018* -
## Math

In ∆ABC, the median AM (M ∈ BC) is perpendicular to the angle bisector BK (K ∈ AC).Find AB, if BC = 12 in.

*asked on October 14, 2017* -
## Language Art, please check!

1. Tiny Tim’s father, Bob Cratchit, works for Scrooge. What is the appositive in this sentence? Tiny Tim father Bob Cratchit *** Scrooge 2. The Ghost of Christmas Future, the third spirit, takes Scrooge to see his grave. What is the appositive phrase in

*asked on April 22, 2016* -
## Algebra

A train covered the distance of 400 km between A and B at a certain speed. On the way back it covered 2/5 of the distance at that same speed and then it decreased its speed by 20 km/hour. Find the speed of the train at the end of its journey from B back to

*asked on March 25, 2016* -
## chemistry

He has narrowed the identity of his unknown to either molecule X, molecule Y, or molecule Z. The Merck Index tells him that all three molecules produce white, needle-like crystals from ethanol. How might he definitively identify his unknown molecule?

*asked on February 2, 2016* -
## Mathematics

Given that 2cos^2 x - 3sin x -3 = 0, show that 2sin^2 x + 3sin x +1 = 0? Hence solve 2cos^2 x + 4sin x - 3 = 0, giving all solutions in the interval 0 ≤ x ≤ 2π

*asked on November 18, 2015* -
## Physics

Converging lens has focal lenght 8 cm , at what distance you will have to place the object in the following devices; 1) Collimator of Spectrum 2) Terrestrial Telescope

*asked on January 14, 2015* -
## science-chemistry

An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over

*asked on October 20, 2014* -
## Chemistry

An aqueous solution of ammonium nitrite decomposes when heated to give off nitrogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was collected

*asked on October 20, 2014* -
## Physics

A physics book slides off a horizontal table top with a speed of 1.30 m/s . It strikes the floor after a time of 0.380s . Ignore air resistance. Find the height of the table top above the floor. Find the horizontal distance from the edge of the table to

*asked on February 16, 2014* -
## chemistry

A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g °C). As a result of the reaction, the temperature of the calorimeter increases from

*asked on August 22, 2013* -
## Thermochemistry

My question is more conceptual. It is expressed in a series of two problems: What energy change occurs when 1.2 moles of methane combust with an enthalpppy change of -434 KJ? CH4+2O2 TO CO2+2H20 I understand it is simply the moles of mthane times the

*asked on March 19, 2013* -
## Physics

A wave described by y(x,t)=Asin(kx-wt) moves down a string. What is the maximum transverse speed an atom of the string can have? What is the displacement of this atom at this time?

*asked on January 18, 2013* -
## Physics

A horizontal wire is held taut by a mass M hanging from its end over a pulley. A harmonic wave of wavelength is produced on the wire by a 52 Hertz vibration. If the mass of the density of the wire is 8.0 x 10^-3 kg/m, what is M?

*asked on January 18, 2013* -
## Physics

The period of longitudinal sinusoidal wave is 0.16 seconds and its wavelength is 8.0 meters. Calculate the wave's speed, frequency, angular frequency and wave number.

*asked on January 18, 2013* -
## Physics

Two copper wires are held under the same tension. If the linear density of the second is twice that of the first, what is the speed of the waves on the second wire (relative to the first)?

*asked on January 18, 2013* -
## algebra

-12a+3(2a+1)=-6a

*asked on November 8, 2012* -
## math

in a class one quarter of students have blonde hair and brown eyes and one third have brown eyes and blonde hair what fraction of the class in total have brown eyes

*asked on September 19, 2012* -
## chemistry

Four solution are prepared and mixed together: Start with 100.0ml of 0.100M BaCl2. Add 50.0ml of 0.100M AgNO3. Add 50.0ml of 0.100M H2So4. Add 250.0ml of 0.100M NH4. Write an equation for any reaction that occurs after each step and calculate the

*asked on May 2, 2012* -
## algebra

This is a project called guess your card. there are 3 people playing and you. We are drawing only numbers from 1 to 9. Each person draws 3 cards and puts them on their foreheads facing out. 1 has a 1,3,7 next person has 3,4,7 and 3rd person has 4,6,8. What

*asked on December 4, 2011* -
## matlab

One bank pays 5.5 percent annual interest, while a second bank pays 4.5 percent annual interest. Determine how much longer it will take to accumulate at least $50 000 in the second bank account if you deposit $1000 initially and $1000 at the end of each

*asked on October 29, 2011* -
## Geography

What are the capitals of the two states that border both the Mississippi and Ohio Rivers?

*asked on September 27, 2011* -
## Geography

What is the difference between a physical map and a political map?

*asked on September 19, 2011* -
## Anatomy

Describe 4 lung volumes that are measured by a spirometer

*asked on June 1, 2011* -
## chemistry

How much energy does it take to heat 10ml up 30 degrees celcius in kilocalories

*asked on May 11, 2011* -
## Science

It would be awesome if you can help me with this :) Two station astronauts each need to perform three 8-hour EVAs during their 13-day mission to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. How much oxygen will

*asked on January 31, 2011* -
## alg

what are the non-permissible value for the rational expression x^2 + x - 6 / x^2 + x -12? a) x = 3 and x = -4 b) x = 0 and x = -4 c) x = 0 and x = -2 d) x = 2 and x = -3

*asked on June 27, 2010* -
## algebra

simplify: sqrt 2/7 a) sqrt (7) b) 2 c) sqrt (2) d) sqrt (14) / 7

*asked on June 21, 2010* -
## Chemistry

All of the following apply to the reaction A(g)+B(g)C(g) as it is carried out at constant temperature in a rigid container EXCEPT: A)The total pressure decreases B)The rate of reaction decreases C)The entropy of the system decreases D)The number of

*asked on May 4, 2010* -
## physics

What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz

*asked on March 23, 2010* -
## physics

What is the wavelength of the radio waves broadcast by an FM radio station with a frequency of 90.5 MHz?

*asked on March 23, 2010* -
## Calculus

For any constant c, define the function f_c(x)= x^3+2x^2+cx. (a) Graph y = f_c(x) for these values of the parameter c: c = -1, 0, 1, 2, 3, 4. What are the similarities and differences among the graphs, and how do the graphs change as the parameter

*asked on November 1, 2009* -
## math problem

how do I find all real solutions of this quadratic equation. w^2 = 3(w - 1)

*asked on August 31, 2009* -
## Physics

On a hot summer day, a young girl swings on a rope above the local swimming hole. When she lets go of the rope her initial velocity is 2.25m/s at an angle of 35.0 above the horizontal. If she is in flight for 0.616sec, how high above the water was she when

*asked on March 13, 2008* -
## Calculus III

Derivative of Inverse Trigonometric Functions f(x) = cos(arcsin(2x)) What is f'(x)?

*asked on January 22, 2008* -
## Calculus III

Derivative of Inverse Trigonometric Functions f(x) = sin(arccos(4x)) What is f'(x)?

*asked on January 22, 2008* -
## Geometry

What would the radius and height be of a 3-dimensional cylinder that was formed by rotating a square, with 3 inch sides, around the y-axis?

*asked on April 10, 2020* -
## math

Name a pair of numbers whose greatest common factor is the same as one of the numbers.

*asked on September 7, 2019* -
## Chemistry

Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).

*asked on May 15, 2019* -
## biology

Does the affinity of myoglobin for oxygen change when oxygen concentration changes? Im not really sure how to answer this. I know that myoglobin has very strong affinity for oxygen so once myoglobin is in the presence of oxygen it will react right away

*asked on October 7, 2018* -
## Chemistry

What is the new concentration of acetic acid after 120mL of 0.201M acetic acid is mixed with 160mL of 0.248M sodium acetate Im not sure how to start this one would it be (120x.201)+(160x.248)

*asked on September 30, 2018*