Friday

July 29, 2016
Total # Posts: 3,253

**physics**

A steel section of the Alaskan pipeline had a length of 58.5 m and a temperature of 18.0 °C when it was installed. What is its change in length when the temperature drops to a frigid -37.7 °C?
*June 14, 2015*

**physics**

The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29.0 °C the air gap between the rods is 1.93 x 10-3 m. At what temperature will the gap be closed?
*June 14, 2015*

**physics**

A copper kettle contains water at 29.1 °C. When the water is heated to 86.6 °C, the volume of the kettle expands by 5.56 x 10-5 m3. Determine the volume of the kettle at 29.1 °C.
*June 14, 2015*

**physics**

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 31.8...
*June 14, 2015*

**physics**

An ice chest at a beach party contains 12 cans of soda at 4.56 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.54-kg watermelon at 28.5 °C to the chest. The specific heat capacity of watermelon is nearly ...
*June 14, 2015*

**physics**

Two bars of identical mass are at 29 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 92 °C, ...
*June 14, 2015*

**physics**

How much heat in joules must be added to 0.413 kg of aluminum to change it from a solid at 122 °C to a liquid at 660 °C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg.
*June 14, 2015*

**physics**

A thick, vertical iron pipe has an inner diameter of 0.070 m. A thin aluminum (α = 23x10-6 (C°)-1) disk, heated to a temperature of 89°C, has a diameter that is 4.4x10-5 m greater than the pipe's inner diameter. The disk is laid on top of the open upper end of...
*June 14, 2015*

**STATISTICS**

Find the approximate 84th percentile of the pig pregnancy length distribution
*June 2, 2015*

**chemistry **

Describe the difference in intermolecular forces between the two molecules. How does this affect the properties of the substance first one molecule is made up of H3C,OH,CH3, and another CH3. The second molecule is made up of H3C,O,OH3, and CH3.
*May 29, 2015*

**science (cladogram)**

Oh! and thx San for the response. It help me understand the question better. Thx ;)
*May 28, 2015*

**science (cladogram)**

If the dude was going to pretend to be someone he could have at least spelled Mrs.Sue name right. It is mRs.sue. He clearly forgot the r. It was ov. he was a fake. Trust me, I'm sure Mrs.Sue wouldn't curse a child.
*May 28, 2015*

**physics**

Please help! I want to make sure my answer is correct. Q:A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 10^6 N. What is the average ...
*May 28, 2015*

**English**

What is the significance of Catherine Earnshaws ghost in Wuthering Heights?
*May 27, 2015*

**math **

Mike has a tree 58ft long and wants to cut it into 24 equal pieces. How long would the pieces be?
*May 26, 2015*

**Art**

I double checked @m1538 and he or she is right. S0 if you are looking to see if it is right it is.
*May 24, 2015*

**geomotry **

In Triangle ABC, AC = BC and mC = 62°. The longest side of the triangle is:
*May 22, 2015*

**French**

Does France have "White House?"
*May 18, 2015*

**algebra**

Alonzo wants to buy a bike for $260. He can pay for it in 8 months if he pays $60 now and $25 each month. If he were to pay $60 now and $20 each month, how many more monthly payments would it take to pay for it?
*May 7, 2015*

**Math **

. At a track meet, 50 people ran the 100-meter dash. 2 people finished in 11 seconds, 5 people finished in 12 seconds, 8 people finished in 13 seconds, 10 people finished in 14 seconds, 21 people finished in 15 seconds, 2 people finished in 16 seconds, and 2 people finished in...
*May 6, 2015*

**Calculus**

h(x) = x+cos(ax) is a family of functions where a is a positive constant such that 0<a<4. Which values of a make h(x) strictly decreasing? Justify your answer. I can't figure this out and help would be appreciated. Thanks in advance!
*May 2, 2015*

**Calculus**

h(x)= x + cos(ax), where a is a positive constant such that 0 < a < 4. For what values of a will h(x) have a relative maximum at x=1? So I found the derivative and got h'(x) = 1- asin(ax). Then I plugged in 1 for x and set the derivative equal to zero, so I have 1 + ...
*May 1, 2015*

**Calculus**

I made a typo. The derivative is 1+ a sin(ax), sorry.
*May 1, 2015*

**Calculus**

h(x)= x + cos(ax), where a is a positive constant such that 0 < a < 4. For what values of a will h(x) have a relative maximum at x=1? So I found the derivative and got h'(x) = 1- asin(ax). Then I plugged in 1 for x and set the derivative equal to zero, so I have 1 - ...
*May 1, 2015*

**Algebra**

The following equation is quadratic. f(x)=(x-7)(3x-2) What are the x-intercepts of the graph of the related equation y=(x-7)(3x+2)? A) -7 and 2/3 B) -7 and 3/2 C) -3/2 and 7 D) -2/3 and 7
*April 30, 2015*

**Calculus**

I'm not sure how to do this; I figured I should use separation of variables but I got the wrong equation. Help is appreciated, thanks! If dy/dx=(1+x)/(xy), x > 0, and y = –4 when x =1, when x =3, y = ? A. 6.433, −6.233 B. 3.898, −3.898 C. 4.711, −...
*April 30, 2015*

**science**

Ok, all of boo's answers are right. believe me. ;)
*April 29, 2015*

**science**

ok, Im going to find out if boo's answers are right...Which I really think is. But for all who are wondering, I will see if right....
*April 29, 2015*

**Calculus-limits**

What is the limit as x approaches a of (sinx-sin a)/(x-a)? a. -sin a b. cos a c. -sin x d. cos x e. undefined Thanks!
*April 29, 2015*

**Calculus-limits**

I'm studying for the AP exam and I can't figure this problem out. I thought the answer was negative infinity but that isn't an option. Thank you in advance! What is the limit as x approaches infinity of (9x-x^2-7x^4)/(x^3+12x)? a. 9 b. 7 c. -7/12 d. -7 e. Does not ...
*April 29, 2015*

**Chemistry**

Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A) calculate the equilibrium concentrations of SO2 ...
*April 28, 2015*

**algebra**

The apartment building where Herman lives was built 12 years before his grandmother's house. In 4 years, the apartment building will be twice as many years old as Herman's grandmother's house. How many years ago was Herman's grandmother's house built?
*April 28, 2015*

**Calculus**

Can someone check my work on this problem? I'm studying for the AP test and I would really appreciate any help. Let f(x) = the definite integral from [-2,(x^2-3x)] of e^(t^2) dt At what value of x is f(x) a minimum? a. For no value of x b. 1/2 c. 3/2 d. 2 e. 3 The answer I...
*April 28, 2015*

**Calculus help??**

I'm not sure how to solve this and help would be great! d/dx [definite integral from 0 to x of (2pi*u) du] is: a. 0 b. 1/2pi sin x c. sin(2pi x) d. cos (2pi x) e. 2pi cos (2pi x) This is the fundamental theorem, right? What's confusing me is the u and du and the end. ...
*April 28, 2015*

**Algebra**

Jack bought 3 slices of cheese pizza and 4 slices of mushroom pizza for a total cost of $12.50. Grace bought 3 slices of cheese pizza and 2 slices of mushroom pizza for a total cost of $8.50. What is the cost of one slice of mushroom pizza?
*April 27, 2015*

**Physics**

Two pellets, each with a charge of 1 microcoulomb, are located 3 cm apart. What is the electric force between them?
*April 27, 2015*

**Physics**

An equal amount of heat is transferred to two containers containing water at the same temperature. If the second container contains three times as many water molecules as the first, how do the final temperatures compare?
*April 27, 2015*

**Calculus**

The expression dy/dx = x*(cube root y) gives the slope at any point of the graph of the function f(x) where f(2) = 8. A. Write the equation of the tangent line to f(x) and any point (2,8). B. Write an expression for f(x) in terms of x. C. What is the domain of f(x)? D. What is...
*April 26, 2015*

**math **

If the intensity of a lightbulb is 45w/m^2 at a distance of 8m, then what is the intensity of it at a distance of 3m?
*April 26, 2015*

**Chemistry**

Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. A) Standard Conditions B) at equilibrium C)PCH3OH= 1.3atm ; PCO=PH2= 1.2×10−2atm
*April 22, 2015*

**Chemistry**

Consider the following reaction: 2NO(g)+O2(g)→2NO2(g) Estimate ΔG∘ for this reaction at each of the following temperatures and predict whether or not the reaction will be spontaneous. (Assume that ΔH∘ and ΔS∘ do not change too much within...
*April 22, 2015*

**Math**

A toy company has increased their size of one of their dolls. The packaging department has calculated that they need to add 3 inches to each of the dimension of the original packaging (Original height=10 in width=2.75 length=5). What is the new amount of material needed to ...
*April 20, 2015*

**s.s**

power to make laws
*April 17, 2015*

**s.s**

I thing it supreme court
*April 17, 2015*

**s.s**

the legislative branch of the federal government made up of the (Congress/Supreme court)
*April 17, 2015*

**s.s**

is it d
*April 17, 2015*

**s.s**

is it a
*April 17, 2015*

**s.s**

what were the two main goals of the constitution's creators? a.create local goverments and elect a president b.establish the 51st state and define borders c. raise taxes to build the treasury and pay off war debts d. protect citizens' rights and defend the country
*April 17, 2015*

**Integration by Parts**

integral from 0 to 2pi of isin(t)e^(it)dt. I know my answer should be -pi. **I pull i out because it is a constant. My work: let u=e^(it) du=ie^(it)dt dv=sin(t) v=-cos(t) i integral sin(t)e^(it)dt= -e^(it)cos(t)+i*integral cost(t)e^(it)dt do integration by parts again, then I ...
*April 16, 2015*

**business math**

626,863.20$
*April 12, 2015*

**Calculus**

Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 7.5 mi^2/hr. How rapidly is radius of the spill increasing when the area is 8 mi^2? I tried using A=(pi)r^2 and dA/dt=2(pi)r(dr/dt) and plugging in 7.5=2(pi)8(dr/dt) but the ...
*April 10, 2015*

**math**

So it is A?
*April 9, 2015*

**math**

Students in Mrs. Doyles classes use 3/4 of a bottle of hand sanitizer every week. Which expression can be used to find how many bottles of hand sanitizer the students will use in 12 weeks. A. 12 x 3/4 B. 12 + 3/4 C. 12 - 3/4 D. 12 divided by 3/4 I have narrowed it down to A ...
*April 9, 2015*

**Math**

yes
*April 8, 2015*

**math**

an oatmeal cookie recipe that makes 24 cookies requires 1 cup of sugar if alex needs 30 cookies how many cups of sugar should she use
*April 7, 2015*

**math**

Juanita Finn deposits $12,000 into an account at Valley Bank that pays 8% interest compounded quarterly. At the end of 5 years, how much will Juanita have in her account? Round to the nearest cent.
*April 7, 2015*

**LA/READING(:**

1. B 2. A 3. A 4. B 5. A 6. Essay 7. D 8. B 9. D 10. B 11. C 12. D 13. B 14. C 15. D 16. A 17. C 18. A 19. B
*April 6, 2015*

**LA/READING(:**

Hailey is Linda correct on hers?
*April 6, 2015*

**chemistry**

25 mL 0.4 M KOH will neutralize 10 mL 1.0 M H2SO4 solution. A) True B) False
*March 27, 2015*

**History**

US History Crossword Puzzle 1. 9 letters; areas of Mississippi and Alabama characterized by black soil and excellent cotton-growing conditions 2. 13 letters; cotton-producing region of the southern United States How did the Free-Soil Party propose to handle of the question of ...
*March 25, 2015*

**Math**

Use the initial condition y(0)=4 and step size h=.25, calculate the backward Euler on [0,1] for the ODE y'=10y-10y^2. Solve the ODE exactly and compute the errors at t=1.
*March 25, 2015*

**math**

How to make pyramid pattern of 140 blocks?
*March 24, 2015*

**Math**

How much more would there be at the end of 8 years if $4000 were invested at 14% compounded quarterly rather than semiannually? (Round your answer to the nearest cent.)
*March 22, 2015*

**Career Explorations**

career experience
*March 18, 2015*

**7th grade math**

Can u help me ?
*March 18, 2015*

**7th grade math**

For questions 1, 2 identify each sentence as arithmetic, geometric both or neither. 1) 7, 9, 11, 13 ...... A) arithmetic B) geometric C) both D) neither (my answer) 2) 2, 1, 1/2, 1/4, .... A) arithmetic B) geometric C) both (my answer) D) neither
*March 18, 2015*

**accounting**

Savallas Company is highly automated and uses computers to control manufacturing operations. The company uses a job-order costing system and applies manufacturing overhead cost to products on the basis of computer-hours. The following estimates were used in preparing the ...
*March 10, 2015*

**statistics**

A jar contains 3 nickels and 2 dimes. You reach in and randomly select 2 coins. Let x represent the value of the two coins in cents. Find the expected value and standard deviation of x
*March 10, 2015*

**LANUGAGE ARTS**

idk
*March 6, 2015*

**Math**

Thank you so much!
*March 5, 2015*

**Math**

When dropped on a hard surface, a rubber ball takes a series of bounces, each one about 4/5 as high as the preceding one. If the rubber ball is dropped from a height of 20 ft, what is the approximate distance the ball travels before coming to rest? Please explain how you got ...
*March 5, 2015*

**Art**

1.d 2.a 3.d 4.b 5.b
*March 2, 2015*

**Physics**

A 7.5 kg box is on a table. What is the normal force acting on the box in each of the following situations? a) You leave the box alone. b) You push down on the box with a force if 20 N. c) You pull up on the box with a force of 20 N.
*March 1, 2015*

**Physics**

A worker pushes horizontally on a 25 kg crate resting on ground level. The coefficients of static and kinetic friction are 0.4 and 0.3.? a) How much force must he apply to start the crate moving? b) After the crate has stereo moving, how much force must he apply to move the ...
*March 1, 2015*

**Geometrt**

Casey sights the top of an 84 foot tall lighthouse at an angle of elevation of 58 degrees. If casey is 6 feet tall, how far is he standing from the base of the lighthouse?........ Do I use cos, tan, or sin? I did the rest of the worksheet but I'm not sure for this one
*February 28, 2015*

**Physics**

Label as to Mechanical, Electrical, Chemical, Heat, Radiant, Nuclear energy: 1) an egg 2)fire 3)waterfall 4)sound 5)light 6)gasoline 7)lightning 8) sun's energy 9) cooking an egg
*February 26, 2015*

**math**

Jennifer Rick went to Sunshine Bank to borrow $3,500 at a rate of 10¾%. The date of the loan was September 7. Jennifer hoped to repay the loan on January 15. Assume the loan is calculated using ordinary interest. How much will Jennifer totally repay?
*February 26, 2015*

**science**

What will happen when I put in minty mentos into all different kinds of soda?
*February 25, 2015*

**math**

I would say 5,240
*February 25, 2015*

**math**

If √6 is the geometric mean between 6 and another number, then the number is: 1 2 6
*February 25, 2015*

**Math**

Find the equation of the line that passes through (-5,4) and (6,4) My work: M= 4-4/6+5 = 0/11 y=mx+b 4= 0(6) + b 4=b Y=4 Therefore, the equation of the line that passes through (-5,4) And (6,4) is y=4 Was this done correctly?
*February 19, 2015*

**Math**

In a piggy bank there is a total of $15.75. If the ratio of dimes to quarters is 5:7, find the total amount in quarters.
*February 19, 2015*

**chemistry**

I have a lab finished and I have to find the dehydrated sample (show calculations) and the value of n (show calculations). I just need to know how I go about finding these answers using my data?
*February 19, 2015*

**chemistry**

Epsom salts is magnesium sulfate heptahydrate. If a student takes 2.50 g of Epsom salts and heats it to drive off the water, how much mass should the student expect to lose? ( I know that hepta is 7 but that's still not making sense to me)
*February 19, 2015*

**Physics**

An 17.2 kg box is released on a 35.7° incline and accelerates down the incline at 0.274 m/s2. Find the friction force impeding its motion. (in N) How large is the coefficient of friction?
*February 10, 2015*

**Physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.210 and the push imparts an initial speed of 3.50 m/s? (in m)
*February 10, 2015*

**Physics**

If the coefficient of kinetic friction between a 32.7 kg crate and the floor is 0.295, what horizontal force is required to move the crate at a steady speed across the floor? (in N) What horizontal force is required if Uk is zero? (in N)
*February 10, 2015*

**Math**

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth. I got 5.75 as my answer. Is this correct?
*February 6, 2015*

**math estimating products**

Show three ways to estimate 3 / 5 ×9 1/2. Identify each method you use.
*February 5, 2015*

**Science**

What is the central theme of the “As Cheap as Coal” portion in Section 8.1 of your text? (Points : 1)
*January 30, 2015*

**chemistry**

What is the molar mass of pentane if 4.18 ~ 1016 molecules of pentane weigh 5.00 ƒÊg?
*January 30, 2015*

**Science**

i don't know i'm on the same question but i have no clue
*January 28, 2015*

**Math**

So...I would take 1 billion * 6.14in then divide by25,000 to get my answer right?
*January 27, 2015*

**Math**

SIZE: US currency bills are are 2.61 inches wide and 6.14 inches long; they are .0043 inches thick and weigh 1 gram.
*January 27, 2015*

**Math**

Needing help setting these problems up...not necesarily giving me the answers. thanks. In January 2009 the state of Nevada was facing a budget deficit of $1.5 billion. The population of the state was approximately 2 million. How much would each person in the state have to ...
*January 27, 2015*

**Math word problems**

thats the way i ended up doing it...thanks.
*January 27, 2015*

**Math word problems**

An outdoor supply store has its regularly priced $160 jackets on sale for $120. What is the discount rate? 120/160*100=75% but that doesn't seem right. I believe it should be 25% discount, but I dont know how to set that up. Can someone tell me if the above is correct, if ...
*January 27, 2015*

**Math**

Alexander Smith receives a salary of $250 per week plus a commission of 15% on all sales over $1500. Find his earnings during a week in which sales totaled $3000. Not sure how to set this up.
*January 26, 2015*

**French**

Thank you both!
*January 23, 2015*

**French**

Can you look over my french paragraph and make sure it's grammatically correct? Thank you in advance! Mon manoir est grand. Le toit est plat. Cette maison a deux etages. Ma chambre est en bas. Il y a sept chambres dans la maison. Ma chambre est confortable et moderne.
*January 23, 2015*