Friday

August 26, 2016
Total # Posts: 843

**Calculus**

At 2:00 PM a car's speedometer reads 30 mi/h. At 2:10 PM it reads 50 mi/h. Show that at some time between 2:00 and 2:10 the acceleration is exactly 120 mi/h^2.
*March 4, 2013*

**Calculus**

Suppose that 3<= f'(x) <=5 for all values of x. Show that 18 <= f(8)-f(2) <=30.
*March 4, 2013*

**physics**

A 0.4 kg hockey puck moving at 30 m/s hits a straw bale, stopping in 1.4 s. What impulse was imparted to the hockey puck?
*February 9, 2013*

**Calculus**

Two people start from rest at the same point. One walks east at 3 mi/h and the other walks northeast at 2 mi/h. How fast is the distance between the people changingg after 15 minutes?
*February 3, 2013*

**Calculus**

A lighthouse is located on a small island 3 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from P?
*February 3, 2013*

**Calculus**

A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1 m/s, how fast is the boat approaching the dock when it is 8 m from the dock?
*February 3, 2013*

**Calculus**

A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.6 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
*February 3, 2013*

**maths**

Suppose you have $9000 to invest and you invest part of it ($×) in a high risk venture at 11.5% per annum and the remainder with the bank at 4.5% per annum, both for one year. 1) write an algebraic expression for the amount of money invested at 4.5% 2) write an algebraic...
*January 27, 2013*

**Physics, help me!**

On a curved roadway of radius 100m, the suggested speed is 35mph(approximately 16m/s). What must the coefficient of friction be between a car's tires and the road for the car to safely negotiate the curve at the posted speed?
*January 15, 2013*

**physics**

the initial velocity of a 4 kg box is 11 m/s, due west. after the box slides 4 m horizontally its speed is 1.5 m/s. determine the magnitude and the direction of the non conservative force acting on the box as it slides.
*December 16, 2012*

**trig**

A plane has an airspeed of 200 miles per hour and a heading of 28.0°. The ground speed of the plane is 207 miles per hour, and its true course is in the direction of 38.0°. Find the speed and direction of the air currents, assuming they are constants. (Round your ...
*November 29, 2012*

**abnormal psych**

# 1.44 (1 pts.) Dr. Green is an admitting psychologist at a psychiatric hospital. Unfortunately, every client she interviews receives the diagnosis of schizophrenia. Dr. Green's diagnostic system ignores A) reliability. B) variance. C) base rates. D) treatment potential...
*November 27, 2012*

**psych**

21(1 pts.) Based on the incidence of Fetal Alcohol Syndrome in various ethnic groups, which of the following individuals would be considered high risk? A) a woman of French Canadian descent B) a woman of Irish descent C) a woman of Italian descent D) a woman of Native American...
*November 27, 2012*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides in elastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 18, 2012*

**Physics**

A circular disk of radius 30 cm is rotating with an angular velocity of 2 radians / s. What is the tangential velocity of a point on the rim of the disk? What is its centripetal acceleration?
*November 18, 2012*

**Science**

What is the power of a 900 n force applied over a distance of 40 m for 45 sec? What is the horsepower?
*November 16, 2012*

**Physics**

A force of 5 N is applied to a door perpendicular to its face at a distance of 0.75 m from its hinge. What is the torque on the door about the hinge?
*November 16, 2012*

**Physics**

A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
*November 14, 2012*

**Physics**

A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
*November 14, 2012*

**Physics**

A force of 25 N accelerates a body by 5 m/s2. What is the mass of the body?
*November 9, 2012*

**Math**

One calling plan offers long distance calls for .03 per minute. Another plan costs $2.00 per month but offers long distance service for 0.01 per minute. Write and solve an equation to find the number of long distance minuets for which the two plans would cost the same.
*November 6, 2012*

**science**

82 liters plus 3.876 liters is what?
*October 11, 2012*

**Algebra**

You have to wrap gift boxes for your club project. Each box is 4.5 inches wide, 7 inch long, and 4 inches tall. What size sheet of wrapping paper do you need to cut to cover the box? Gift wrap paper comes in sheets which are 30 inches wide and 36 inches long. How should you ...
*October 4, 2012*

**homework**

which locations have the greatest number of hours of daylight on june 21? the fewest hours of daylight?
*October 2, 2012*

**physics**

magnitude: 1.83 m/s^2 acceleration: left or -x axis
*September 30, 2012*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.82 m. The stones are thrown with the same speed of 9.83 m/s. Find the location (above the base of the ...
*September 30, 2012*

**Geometry**

A rectangular garden has an area of 55m2 and a perimater of 32 m. If its length is doubled, what is the % of increase on the new area and perimeter?
*September 26, 2012*

**Pre Algebra**

simplify the following expression x+4(y+8x) Write the property that justifies each step
*September 26, 2012*

**Chemistry**

What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
*September 19, 2012*

**Chemistry**

What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
*September 19, 2012*

**Math**

The answer is.... wait for it... Looking at the first equation, we see we are adding 4+4 =8 and using "00" to finish the addition. In other words, we are just adding the first numbers and using the zeros as place holders. So, in the second problem, add the 24+34 and ...
*September 11, 2012*

**maths**

A wooden crate half full pineapples has a mass of 14kg. The same crate one third full of pineapples has a mass of 12kg. What is the mass of the empty crate? Please help! Many thanks.
*July 1, 2012*

**maths**

Please help! At a cup cake baking competition, Alan baked 55 fewer cupcakes than Tom while Sally baked twice as many cupcakes as what Alan and Tom baked together. If the three of them baked a total of 1125 cupcakes, how many cupcakes did Tom bake? Many thanks
*July 1, 2012*

**chemistry**

2H2+1O2=2H2O delta H=-136 kJ A) how many joules are released when 35.0 grams H2O form B)how many grams of hydrogen burn when 278 kJ are released. C) Draw a potential energy diagram of this reaction.
*May 7, 2012*

**science, chemistry**

2Al(s)+ 3Cl2(g)=2AlCl3(s) For the above reaction calculate: A) delta H, then state whether the reaction is endothermic or exothermic B) delta s, then whether the reaction becomes more or less disorder. C) delta G, the state whether the reaction is spontaneous or non-spontaneous
*May 7, 2012*

**Chemistry**

The free energy of a single electron falling through a potential difference of one volt is 1 electronvolt (eV). Therefore, on a per electron basis, x volts → x eV. Calculate the maximum wavelength of light (in nanometers) that provides enough energy to an electron to ...
*May 6, 2012*

**science-chemistry**

a bicycle tire that has a volume of 0.85L is inflated to 140 pounds per square inch. What will be the pressure in the tire if the number of moles of gas is doubled?
*April 29, 2012*

**Science-Chemistry**

and do i do the same thing for number 2?
*April 29, 2012*

**Science-Chemistry**

1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance. 2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled 7.6m in the same amount...
*April 29, 2012*

**science-chemistry**

can u help me on part c a little more?
*April 29, 2012*

**science-chemistry **

please anwser soon, a rigid 4.10L flask contains a mixture of 1.25 moles of H2, 0.250 mole of O2, and sufficient Ar so that the partial pressure of Ar in the flask is 1.00 atm. The temperature is 63.5 degrees C A) Calculate the total pressure in the flask B) calculate the mole...
*April 29, 2012*

**Chemistry**

2CO(g) + O2(g) 2CO2(g) Go = -511.6 kJ and So = -173.1 J/K at 314 K and 1 atm. The maximum amount of work that could be done by this reaction when 2.43 moles of CO(g) react at standard conditions at this temperature is__________ kJ. how?!
*April 26, 2012*

**algebra**

Cupcakes cost $1.50 each to produce with fixed cost of $50. a) Express the cost C, of producing the cupcakes as a linear function of x cupcakes produced. b)Find the average cost, C=C/x and simplify appropriately. c) What is the horizontal asymptote of C? Interpret. d) Graph C ...
*April 16, 2012*

**math**

There are 20 10% off cards, 10 15% off cards, 6 20% off cards and 4 50% off cards. What is the probability that a person will draw a 50% off card on the third draw?
*April 12, 2012*

**Accounting**

$10,000,000 face value, zero coupon bonds due in 20 years, priced on the market to yield 8% compounded semiannually.
*April 10, 2012*

**Customer Relation**

I know what a internal customer is, but what are some ways you can resolve conflict with a internal customer.
*March 31, 2012*

**Business**

Is it possible for a small business to oversegment its market?
*March 29, 2012*

**Math**

Showing work, what is 32.4 divide by 1038? :)
*March 22, 2012*

**calculus**

Let z = ∫e^(sin(t))dt from x to y a = x b = y I tried thinking about it like a chain rule but even then i'm a little unsure. I know dz/dt = e^(sin(t)). Can you please point me in the right direction if i'm supposed to use the chain rule.
*March 7, 2012*

**math**

James spent 62 % of high school budget on books. In degrees what measurement would that be on a circle graph? A. 62% B. 162% C. 177% D. 223%
*February 28, 2012*

**calculus**

sketching the level curve of f(x,y) = y/(x^2 + y^2) Just wondering if there is a way to get the equation of the line cause I have no clue if im supposed to do it another way or im just rusty and need to review my precalc notes.
*February 25, 2012*

**Algebra 1**

-c(11c+4)
*February 16, 2012*

**math**

A square and a rectangle each have a perimeter of 100 feet. Explain how this is possible.
*February 6, 2012*

**science**

The pull of gravity keeps the Moon in orbit around Earth. The distance between the Earth and Moon is about 380,000 kilometers. A crew of astronauts leaves Earth on a Monday and lands on the Moon on a Thursday. They land on the side of the Moon facing away from the Earth. On ...
*February 2, 2012*

**finite MAth**

dent who wants to buy 3 CDs, but assume that there are 4 CDs featuring the piano, 6 CDs featuring the trumpet, and 7 CDs featuring the saxophone. (1) In how many different ways can the 3 CD's be selected? (2) In how many ways can the selection be made if CD's featuring...
*January 26, 2012*

**finite MAth**

Assume that the student has a cup with 14 writing implements: 7 pencils, 5 ball point pens, and 2 felt-tip pens. (1) In how many ways can the student select 8 writing implements? (2) In how many ways can the selection be made if no more than one ball point pen is selected?
*January 26, 2012*

**Finite MAth**

Assume that the committee consists of 5 Republicans and 7 Democrats. A subcommittee consisting of 6 people is to be selected. (1) How many such subcommittees are possible if each subcommittee must contain exactly 3 Republicans and 3 Democrats? (1) How many such subcommittees ...
*January 26, 2012*

**Finite MAth**

Assume that you have 6 different types of vegetables and 9 different types of fruit. A vegetable salad consists of a mixture of any 3 types of vegetables, and a fruit salad consists of a mixture of 3 kinds of fruit. (1) In how many different ways can you prepare a vegetable ...
*January 26, 2012*

**Finite MAth**

Assume that the set S has 7 elements. How many subsets of S have at most 3 elements
*January 26, 2012*

**chem**

How many grams of iron metal do you expect to be produced when 245 grams of an 80.5 percent by mass iron (II) nitrate solution reacts with excess aluminum metal? Show all of the work needed to solve this problem. 2 Al (s) + 3 Fe(NO3)2 (aq) 3 Fe (s) + 2 Al(NO3)3 (aq)
*January 17, 2012*

**chem**

How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem
*January 17, 2012*

**chem**

How many moles of glucose (C6H12O6) are in 1.6 liters of a 0.75 M C6H12O6 solution?
*January 17, 2012*

**chem**

How many moles of sodium chloride (NaCl) solute are in 155 grams of an 85.5 percent by mass solution?
*January 17, 2012*

**chem**

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)
*January 17, 2012*

**chem**

Describe, in detail, how to make 3.0 liters of a 3.5 molar HCl solution from an 18.5 molar HCl stock solution.
*January 17, 2012*

**10th chem**

Describe, in detail, how to make 3.0 liters of a 3.5 molar HCl solution from an 18.5 molar HCl stock solution.
*January 17, 2012*

**10th Grade Chem**

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl
*January 16, 2012*

**math**

f(x)=x2+2x-5
*January 16, 2012*

**Math**

what is 918 out of 3400? Pls explain.
*January 11, 2012*

**math**

about 12.6% of the bones are vertebrae in the human back. how many bones in the human body are vertebrae?
*January 11, 2012*

**math**

about 12.6% of the bones are vertebrae in the human back. how many bones in the human body are vertebrae?
*January 11, 2012*

**math**

just use this formula A squared times B squares so you will take 23x23=529 then 13x13=169 then u take both answers and add them and it is 698 and after that u get the square root of 698 and it is 26.41
*January 5, 2012*

**Social Studies**

it depends on what part you are talkin about because the reason the U.S got into it was only because we went to south korea and then the north invaded soo the U.S backed them up and still to this day we are still over there in korea
*January 4, 2012*

**Law**

Under the _____, the solid waste provisions are more supportive than punitive in nature. (Points : 2) Gutter Act Bathroom Act Resource Conservation and Recovery Act Drain Act is it C?
*December 10, 2011*

**Math**

How do you factor 49t6 - 4k8?
*December 7, 2011*

**math**

95% of the employees read any newspaper, therefore 5% don't read and newspaper. D should be 147
*December 5, 2011*

**math**

Almost everyone at the Bright Corporation reads a daily newspaper on a regular basis. In fact, altogether te company employs 2,940 people,of whom70% read The Daily News,45% read The Courier and 60% read The inquirer. One fourth of the employees reads The Daily News and The ...
*December 5, 2011*

**Law (Check)**

(TCO 6) A director of a corporation does NOT have a duty to: A)act diligently and in good faith in conducting corporate business. B)act resourcefully and always make the best business judgment. C)act on behalf of the beneficiary with great integrity. D)act in the best ...
*November 27, 2011*

**Law**

A retirement plan based on age in which an employer offers $10,000 as a base early retirement incentive for 55-year-olds, $8,000 for 56-year-olds, and so on, and nothing to persons age 60 or older. Does such a plan amount to illegal age discrimination? My Response: No, its not...
*November 20, 2011*

**General**

Could someone hope to avoid the obligations of contract on grounds that a ad was a misleading inducement to sign the contract?
*November 10, 2011*

**Law**

Many notable characters, songs, and movies that were previously set to enter into the public domain have not as of yet due to repeated extensions of the copyright laws that have extended protections. Many of the Disney characters, including Mickey Mouse, Donald Duck, and Goofy...
*November 10, 2011*

**Organic Chem**

The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH ---> CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.150 M, the rate of the reaction is 0.0090 M/s. a) what is the rate of the reaction if the concentration of CH3Br is doubled? ...
*November 9, 2011*

**Check Business Law**

(TCO 4) State court jurisdiction can be established in all of the following ways EXCEPT: a)when the defendant is a resident of the state, a summons may be served at that residence. b)cases involving more than $75,000 where the plaintiff and the defendant are citizens of ...
*November 6, 2011*

**English**

The strategies for writing positive or neutral message. is my response correct?: In the opening avoid personal information state your main idea so it wouldn't be overlooked. In the body of the message provide reasons and/or details for the main idea. Close your message ...
*November 6, 2011*

**Business **

Yes, that's why I asked I see the same thing. I'm going to go with A though. Thanks
*October 30, 2011*

**Business **

which statement is false about Globaliztion? Free markets are effective than government rules or national boundries are increasing in importance. I think its A, that free markets are more effective than government rules.
*October 30, 2011*

**physics**

If you were to expend 10 J of work to push a 1 C charge against an electric field, what would be its change of voltage? (b) When released, what will be the kinetic energy of the 1 C charge of the previous problem if it flies past its starting position?
*September 7, 2011*

**math**

give an example of two fractions whose sum can be simplified to 1/2.
*September 6, 2011*

**math**

How to draw a picture grid to show 1.8 divided by 0.6? Write the quotient.
*August 23, 2011*

**math**

In 1968, the estimated population of the world was 3,559,028,982 people. When this number is written in expanded form using exponents, one power of 10 would not be represented. Which power of 10? Why?
*August 9, 2011*

**chemistry**

Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change of the decomposition of propane? 3 C + 3 O2 3 CO2 H =-1182 kJ 4 H2 + 2 O2 4 H2O H = -1144 kJ C3H8 + 5 O2 3 CO2 + 4 H2O H = -2222 kJ C3H8 3 C + 4...
*June 17, 2011*

**Biology**

How could a farmer tell whether his tomatoes are pure red or heterozygous?
*June 11, 2011*

**statistics(best fit line)**

I'm trying to graph a set of points with data, and I have been given the equation for the best fit line, but when I graph it, the line doesn't match up with the data. It's either too steep or too low. I think it has to do with my intervals for the x and y axes. On ...
*June 8, 2011*

**maths**

A cylindrical water tank has a diameter of 140cm.To begin with it is full of water.A leak starts at the bottom so that it loses 33l of water in 1hour.How long will it take for the water level to fall by 30cm?
*April 12, 2011*

**math**

32 is _____ % of 100? 3 is 5% of what number?
*March 17, 2011*

**Chem**

Cyclopropane (C3H6) reacts to form propene (C3H6) in the gas phase. The reaction is first order in cylclopropane and has a rate constant of 5.87*10^-4 at 485degreesC. If a 2.5L reaction vessel initially contains 724 torr of cyclopropane at 485degreesC, how long will it take ...
*February 24, 2011*

**Resume writing**

can someone proofread my resume profile. Highly motivated University of Maryland University College student seeks exposure to the practical application of Management Studies concepts as a management professional in a dynamic, fast paced corporate environment. Comprehensive ...
*February 19, 2011*

**geometry**

misty drew a triangle.one angle is 120 degres.two of the sides measure 5 cm and 8 cm in lengh. the sum of the lengths off all tree sides is 21 cm. wat kind of triangle did misty draw?
*January 24, 2011*