Thursday

April 2, 2015

April 2, 2015

Total # Posts: 6,562

**Physics**

A 60 kg ice skater holds up a large sheet of cardboard that can catch the wind and drive her (frictionlessly) across the ice. While she's moving at 0.5 m/s, a wind that is constant and horizontal for 5.0 s exerts a force on the cardboard of 1.7 N. What is the skater's ...
*December 29, 2011*

**Physics**

A 60 kg ice skater holds up a large sheet of cardboard that can catch the wind and drive her (frictionlessly) across the ice. While she's moving at 0.5 m/s, a wind that is constant and horizontal for 5.0 s exerts a force on the cardboard of 1.7 N. What is the skater's ...
*December 29, 2011*

**grammar**

All I got were a doll, a hat, and a bat. subject-verb agreement
*December 20, 2011*

**math**

Let f(x)= 4 and g(x)= ãx-2 : X2 - 4 f o g(11)=ANSWER: Square root X-2/ 11-2 =ã9=3 4/32 -4 = 4/5 f o f(0)=ANSWER Determine the Domain of f o g=ANSWER:
*December 18, 2011*

**calc**

Let f(x)= 4 and g(x)= ãx-2 : X2 - 4 f o g(11)=ANSWER: ãX-2/ 11-2 =ã9=3 4/32 -4 = 4/5 f o f(0)=ANSWER Determine the Domain of f o g=ANSWER:
*December 18, 2011*

**cal**

1. Given the function f(x) and g(x) below determine the following: A) f o g(3) ANSWER: B) f o g(-4) ANSWER: C) g o f(0) ANSWER: D) f o f(1) ANSWER: E) g o g(-2) ANSWER:
*December 18, 2011*

**math**

Suppose that you are a CSI and you are called to a crime scene at 12:00 noon and find a dead body in a walk-in that is a constant 40¨H. The initial temperature is 85¡ã and after 20 minutes. The body¡¯s temperature is 84¡ã. Using Newton&...
*December 18, 2011*

**CHEMISTRY**

546.0 J
*December 16, 2011*

**Math (URGENT)**

solve for x, 0 ¡Ü x < 360 tan2x+1=0 My answers: 22.5, 157.5, 202.5, 337.5 Textbook: 67.5, 157.5, 247.5, 337.5 I don't understand. Am I wrong? Thanks for your help.
*December 16, 2011*

**trig**

How do you find 2.8 revolutions per second in radians? I understand that two revolutions would be equal to 4pie but how do you find the 0.8?
*December 14, 2011*

**trig**

A bolt secured to a bridge is being acted upon by forces being exerted by two cables attached to the bolt. The force vector for one of the cables is represented by F1 = <1.7,9.8>. The other force vector, F2, is known to have a magnitude 5 and a direction angle of 10 ...
*December 14, 2011*

**math**

how did you get the denominators to be the same?
*December 14, 2011*

**trig**

Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X) = 1
*December 14, 2011*

**Anthro**

none of the 188,000 results are good fr information
*December 13, 2011*

**Anthro **

“How do images challenge our assumptions and understanding of society as relatively cohesive, homogenous and stable social units?” (feel free to simply summarize potential ideas)
*December 13, 2011*

**English (URGENT)**

How many paragraphs does a literary review have? This is a writing assignment for Grade 12 English. I need to write literary review on an article I find on the internet. I have an identification paragraph that talks about the author's credentials. Then I have a paragraph ...
*December 12, 2011*

**world geography**

in a traditional economic system which type of good is most often produced?
*December 12, 2011*

**calculus**

A tank with a rectangular base and rectangular sides is to be open at the top. It is to be constructed so that its width is 4 meters and its volume is 36 cubic meters. Building the tank costs $10 per square meter for the base and $5 per square meter for the sides. a) Write a ...
*December 12, 2011*

**math**

thank you soooooooooooo much!!!!
*December 11, 2011*

**statistics**

Three percent of the widgets produced by machine 1121 are defective. what is the probablity that a box of 30 widgets produced by that machine contains two or more defective widgets?
*December 10, 2011*

**math**

7 in by 8 in
*December 8, 2011*

**math**

A room measures 12 feet by 15 feet. find the scale that would allow the room to be shown as large as possible on a piece of paper. explain your reasoning.
*December 8, 2011*

**College Physics**

Thank you very much
*December 6, 2011*

**College Physics**

A monatomic ideal gas is compressed adiabatically from a pressure of 1.39 105 Pa and volume of 260 L to a volume of 39.0 L. What is the new pressure of the gas?
*December 6, 2011*

**math**

Two trains depart at the same time from the same station and travel in opposite directions. One train travels 25 mph faster than the other train. After 2 hours the trains are 162 miles apart. Find the speed of each train.
*December 5, 2011*

**math**

Two trains depart at the same time from the same station and travel in opposite directions. One train travels 25 mph faster than the other train. After 2 hours the trains are 162 miles apart. Find the speed of each train.
*December 5, 2011*

**Science HELP**

when traveling only a tiny distance through rock below the earths surface what happens to alpha particles ?
*December 5, 2011*

**Science**

what can alpha particles cause significant damage to ?
*December 5, 2011*

**calculus**

Being some distance from a mountain a man looks up at a 9 degree angle to see the top of the moutain. he then moves 13 miles away from the mountains at looks up at a 3.5 degree angle to see the top of the mountain. How tall is the mountain?
*December 4, 2011*

**AP Chemistry**

5 J
*December 4, 2011*

**Physics**

A child of mass 40 kg stands beside a circular platform of mass 100 kg and radius 1.8 m spinning at 2.6 rad/s. Treat the platform as a disk. The child steps on the rim. a) What is the new angular speed; rad/s b) She then walks to the center and stay there. What is the angular ...
*December 4, 2011*

**Physics**

A circular disk of mass 0.3 kg and radius 40 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.1 rad/s. a) Find the new angular velocity of the combination; A circular disk of mass 0.3 kg and ...
*December 4, 2011*

**Physics**

A turntable with a moment of inertia of 0.017 kg*m^2 rotates feely at 3.3 rad/s. A circular disk of mass 240 g and diameter 26 cm, and initially not rotating, slips down a spindle and lands on the turntable. a) Find the new angular speed. b) what is the change in kinetic energy?
*December 4, 2011*

**Physics **

A turntable with a moment of inertia of 0.017 kg*m^2 rotates feely at 3.3 rad/s. A circular disk of mass 240 g and diameter 26 cm, and initially not rotating, slips down a spindle and lands on the turntable.
*December 4, 2011*

**biology**

Ectothermic organisms have body temperatures that vary with the temperature of their surroundings. Discuss the effect this variation might have on the functioning of enzymes in these organisms. Suggest some ways ectothermic organisms might cope with this problem.
*December 4, 2011*

**geometry**

The area of a particular regular hexagon is x^3 square units, where x is the measure of the distance from the center of the hexagon to the midpoint of a side. what is the side length of a hexagon?
*December 3, 2011*

**Precalculus**

A builder has 600 feet of fencing to enclose three adjacent rectangular partioned areas. Find the largest possible enclosed area of the partioned areas.
*December 2, 2011*

**Physics**

A small disk of radius R1 is mounted coaxially with a larger disk of radius R2. The disks are securely fastened to each other and the combination is free to rotate on a fixed axle that is perpendicular to a horizontal frictionless table top. The rotational inertia of the ...
*December 2, 2011*

**math**

A secretary can type 8 pages per hour.There are a total of 96 pages to type. How many pages remain to be typed after 6 hours?
*December 2, 2011*

**Math**

In a flower box there are nine red flowers and six white flowers. There are three times as many yellow flowers as white ones. How many flowers are there in all?
*December 1, 2011*

**physics**

A bicyclist is traveling at 19.3 km/h when he speeds up with a constant acceleration of 0.67 m/s2. What is his velocity after 5.00 s?
*November 30, 2011*

**Science**

A block of mass 3.1 kg hangs vertically from a frictionless pulley of mass 5.9 kg and radius 14 cm. Treat the pulley as a disk. Find: a) the acceleration of the block; b) the tension in the rope; c) the speed of the block after it has fallen 55 cm, assuming it started at rest:
*November 30, 2011*

**Science**

A torque of 60 N*m acts on a wheel of moment of inertia 30 kg*m^2 for 5 s and then is removed. a) What is the angular acceleration of the wheel? b) How many revolutions does it make in 15 s if it starts at rest?
*November 30, 2011*

**Science**

Two particles with masses 3.1 kg and 6.6 kg are connected by a light rod of length 4 m. Find the moment of inertia of the system about an axis perpendicular to the rod and passing through: a) the midpoint of the rod; b) the center of mass of the system of particle:
*November 30, 2011*

**Science**

Four particles in the xy plane have the following masses and coordinates: 1 kg at (3 m, 3 m), 2 kg at (-2 m, 4 m), 3 kg at (3 m, -2 m) and 4 kg at (-3 m, -4 m). Find the total moment of inertia about: x-axis? y-axis? z-axis?
*November 30, 2011*

**Science**

At t = 0 s a flywheel is rotating at 30 rpm. A motor gives it a constant acceleration of 0.9 rad/s^2 until it reaches 70 rpm. The motor is then disconnected. How many revolutions are completed at t = 20 s?
*November 30, 2011*

**Science**

the work is on a forum that actually helps ppl
*November 30, 2011*

**Science**

Two blocks with masses m1 = 3.9 kg and m2 = 6.7 kg are connected by a string that hangs over a pulley of mass M = 2.2 kg and radius R = 0.11 m as shown above. The string does not slip. Assuming the system starts from rest, use energy principle find the speed of m2 after it has...
*November 30, 2011*

**3rd grade math**

8*5=40 40 add in two zeroes to get 4000
*November 29, 2011*

**Future **

Just Don't put your hopes too high. I've seen peoples lives crushed when they got rejected from their dream school. Some advice: Get Involved in Social Activities Really have to make an Impact -Its not just about the grades, but although those are really important. *PS...
*November 29, 2011*

**Economics**

How large would a corrective tax need to be to move this market from the equilibrium outcome to the socially-optimal outcome? A. An amount equal to P' minus P. B. An amount equal to P'. C. An amount equal to P. D. An amount equal to the external cost.
*November 29, 2011*

**Economics**

Suppose planting flowering shrubs creates a positive externality equal to $7 per shrub. Further suppose that the local government offers a $7 per-shrub subsidy to planters. The number of shrubs that are planted is then A. less than the socially optimal quantity. B. greater ...
*November 29, 2011*

**Physics**

At t = 0 s a flywheel is rotating at 30 rpm. A motor gives it a constant acceleration of 0.9 rad/s^2 until it reaches 70 rpm. The motor is then disconnected. How many revolutions are completed at t = 20 s? number of revolutions?
*November 28, 2011*

**Physics**

Two blocks with masses m1 = 3.9 kg and m2 = 6.7 kg are connected by a string that hangs over a pulley of mass M = 2.2 kg and radius R = 0.11 m as shown above. The string does not slip. Assuming the system starts from rest, use energy principle find the speed of m2 after it has...
*November 28, 2011*

**Physics**

A torque of 60 N*m acts on a wheel of moment of inertia 30 kg*m^2 for 5 s and then is removed. a) What is the angular acceleration of the wheel? rad/s^2 b) How many revolutions does it make in 15 s if it starts at rest?
*November 28, 2011*

**Physics**

Smith
*November 28, 2011*

**business**

Does anyone know of any specific business turnaround strategies that have failed in the past? What happened with GM? Did they try to do a turnaround? What was their strategy and why did it fail?
*November 26, 2011*

**business**

Does anyone know of any specific business turnaround strategies that have failed in the past? What happened with GM? Did they try to do a turnaround? What was their strategy and why did it fail?
*November 26, 2011*

**medical billing**

The Local School District Has Asked Your Clinic To Submit a Proposal To Do Pre Employment Physicals FOr 60 Bus Drivers What Financial Or Accounting inFOrmation Do You Need To Submit The Proposal
*November 26, 2011*

**Algebra**

Use this proportionality: A correlation V square 2/3 How much more material is needed to manufacture an industrial plastic container with twice the volume of a similar container? A manufacturer of plastic containers prices its product by the amount of plastic used to make the ...
*November 26, 2011*

**Chemistry**

You have 1L of an ideal gas at 0 degree celsius and 10 atm pressure. You allow the gas to expand against a constant external pressure of 1 atm, while the temperature remains constant. Assuming, 101.3 J/liter-atm, find q,w,delta E, and delta H in Joules, A) if the expansion ...
*November 25, 2011*

**math**

line
*November 25, 2011*

**math**

a) use law of cosines b) use hero's formula
*November 25, 2011*

**Physics**

[Young & Freedman, 3-12] A military airplane on a routine training mission is flying horizontally (in the positive x-direction) at a speed of 120. m/s and accidently drops a bomb (fortunately not armed) at an elevation of 2090 m. Air resistance may be ignored and answer with ...
*November 23, 2011*

**english**

can you give me a good common sentence that has these words:to,two,and too
*November 22, 2011*

**computers**

In which type of network configuration is each device connected to exactly two other devices? (Points: 5) Bus Mesh Ring Star im confused between B and C plz help
*November 22, 2011*

**computers**

What type of network is a collection of devices that equally share the processing and storage without having a centralized server? (Points: 5) Client/server File server Peer-to-peer Web-based is it C
*November 22, 2011*

**computers**

Which type of data communication system is composed of a group of devices in close proximity? (Points: 5) CAN LAN MAN WAN Is it LAN
*November 22, 2011*

**ETH501**

1) What I would like for you to do is to choose three (3) "virtues" and then provide a clear definition of each. For example, you might choose such virtues as temperance, justice, honesty, fairness, generosity, or kindness. Be sure that you define each virtue using a...
*November 22, 2011*

**Math**

How to graph: x(x+3)^2 I understand its a cubic function. Anyone care to help me with solving and graphing it? thanks.
*November 21, 2011*

**Chemistry**

How many more grams of Li SO4 can you dissolve in 250g of water at 10.0 degrees C than at 50 degrees C. The solubility is 35.0 at 10 degrees and at 50 degrees C it is at 32.5. Thanks DR Bob for all your help.
*November 21, 2011*

**Math (URGENT)**

I understand why the vertex is there, I just don't understand what you mean by completing the square.
*November 21, 2011*

**Math (URGENT)**

How to graph this: Step 0: y=x(x-4) Step 1: y=x^2-4x What's next? Calculator shows vertex at (2,-4) I asked before, but I'm still stuck. Please help. thanks.
*November 21, 2011*

**chemistry**

Dr Bob, could you please tell me if this is right. Thanks again. Molar Mass of Na = 22.990 Cl = 35.453 NaCl = 58.453 g/mol Change g to moles……. moles= grams/molar mass = (25g) / 58.453 g/mol = 0.427moles Then M = moles/L = .427 moles/ 0.0105 = 406.66
*November 21, 2011*

**chemistry**

An aqueous solution is 25 % mass % NaCI. The density of the solution is 1.05g/ml. What is the molarity of the solution?
*November 21, 2011*

**chemistry**

How would you prepare 1.00 L of an alchol water solution that is 5.00 vol % alchol.
*November 21, 2011*

**chemistry**

How many more grams of Li SO4 can you dissolve in 250g of water at 10.0 degrees C than at 50 degrees C.
*November 21, 2011*

**Math (URGENT)**

How to graph: y=x(x-4) Calculator shows the vertex at (2,-4) Can someone explain why? Thanks.
*November 21, 2011*

**Math**

Simplify: y=x(x-4) little help please. thanks.
*November 21, 2011*

**chemistry**

Exactly define the number of hydrogen and hydroxide ions at pH 6. What about pH 8?
*November 20, 2011*

**chemistry**

4284.416. but what unit would it be in?
*November 20, 2011*

**chemistry**

If a gram of water at sea level is heated from 37 degrees Celsius to 101 degrees. How much heat would be absorbed by the water?
*November 20, 2011*

**Math**

I have 6 pairs of socks lying unmatched in my dresser drawer. Each pair is a different color(brown, black, red, yellow, green, and purple). When I wake up in the morning, I randomly grab 2 of the loose socks and put them on without looking. If 2 socks are randomly selected ...
*November 18, 2011*

**Physical Chemistry**

Derive an expression for number of electrons N(E) with energy that can escape from a metal in terms of Z(E) (density of state) and F(E) (Fermi-dirac function) and ф (work function).
*November 18, 2011*

**Science**

Which of the following is visible to a person only because light from another source reflects off it? - lightning - flashlight - cloud - sun
*November 16, 2011*

**Calculus**

(a) Find the Riemann sum for f(x) = 7 sin x, 0 ≤ x ≤ 3π/2, with six terms, taking the sample points to be right endpoints. (Round your answers to six decimal places.) I got 3.887250 as an answer, but that's not right. (b) Repeat part (a) with midpoints as ...
*November 16, 2011*

**Math**

Record 7 digits (0-9) in ascending order that have a mean of 3 and a median of 1. Explain how to come up with the answer as well please and thank you.
*November 16, 2011*

**Math**

Record 7 digits (0-9) in ascending order that have an inter-quartile range of 4.
*November 16, 2011*

**physics**

A large, solid metal sphere is suspended from a the ceiling by a cable, and is free to rotate about the wire. If the mass of the sphere is 176 kg, its radius is 0.7 m, and it is initially rotating at 28 rpm (revolutions per minute), what work is required to increase its ...
*November 15, 2011*

**History**

Please Help. How did the Islamic Slave Trade change the existing system?
*November 14, 2011*

**History**

Please Help. What was one of the powerful movements that transformed European society during the early modern era? Between the 16th and 17th centuries.
*November 14, 2011*

**History**

Please Help. I would like to ask if it would have been possible with out the prior development of the Enlightenment? For instance, if some of the main issues that troubled Martin Luther (such as the Catholic Church's practice of requiring "tributes" for pray and/...
*November 14, 2011*

**History**

Please help. What was one of the powerful movements that transformed European society during the early modern era?
*November 14, 2011*

**Calculus**

A stone is dropped from the upper observation deck of a tower, 200 m above the ground. (Assume g = 9.8 m/s^2.) a)Find the distance (in meters) of the stone above ground level at time t. b)With what velocity does it strike the ground? (Round your answer to one decimal place.) c...
*November 13, 2011*

**US history HELP**

From late 1941 into early 1942, World War II in the Pacific experienced a succession of Japanese victories that saw numerous Allied outposts fall.
*November 13, 2011*

**Health**

Does Sickle Cell Disease involve a single gene or entire chromosome?
*November 13, 2011*

**economics**

since the AC curve in the problem is upward-sloping everywhere, it is not possible to construct a zero-profit equilibrium given the assumptions of the problem (this outcome requires a U-shaped AC curve). this problem will consider an alternative example where a long-run ...
*November 13, 2011*

**economics**

Q AC MC 1 4 12 2 8 20 3 12 28 4 16 36 5 20 44 6 24 52 7 28 60 8 32 68 9 36 76 suppose that there are 70 firms in operating in the industry. using the MC curve, find out how much output in total is delivered to the market at each price (you only need to consider prices equal to...
*November 13, 2011*

**spanish**

Could anyone please tell me why these sentences are grammatically incorrect please 1. Queremos nuestros hijos tienen maestros buenos y competentes. 2. Esto requiere el gobierno a gastar más dinero. 3. El que me preocupa es que no tenemos suficiente dinero. 4. Es ...
*November 12, 2011*

**computer**

How does a computer generated animation work? (Points: 5) The computer creates constant movement in the characters. The computer, along with human workers, moves the characters on the screen. The computer creates a set of continuous movements, one character at a time. The ...
*November 11, 2011*

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