Total # Posts: 1,057
Physics / Dynamics
After the fuel is turned off, the rotor of a jet engine decelerates under the action of air friction, which depends on the square of its speed, and constant bearing friction. Thus the deceleration is written as b + c * w^2, where b and c are constants and w is the angular ...
April 11, 2008
A series of small packages are being moved by a thin conveyor belt that passes over a 300-mm radius idler pulley. The belt starts from rest at time t=0 and its speed increases at a constant rate of 150mm/s^2. Knowing that the coefficient of static friction between the packages...
April 7, 2008
Challenge and Change
I'm trying to find an answer to this question.. Search and find three other contributors to the field of Marxist or neo-Marxist (new Marxist) research... I've been searching for hours with no luck!! Someone please help!
February 17, 2008
In 39.0 s, a pump delivers 549 dm3 of oil into barrels on a platform 22.0 m above the pump intake pipe. The density of the oil is 0.82 g/cm3. (a) Calculate the work (kJ) done by the pump (b) Calculate the power (kW) produced by the pump W = Fd --> W = mad D = m/v P = W/t...
December 16, 2007
I need help on a washington state bill for my class and I have to eithe be for or against it. this bill is caled initiative 960 and it concerns taxes.I need this report done and I am stuck. if you anser this thank you so mutch.
November 2, 2007
Conrad Beach and its forest site it is a good example of an area that has undergone primary succession. The first step of the process of the primary ecological successions that have occurred at Conrad Beach is that mostly grass and some herbs and mosses were the first plants ...
October 24, 2007
Main Entry: primary source Part of Speech: n Definition: an original fundamental and authoritative document pertaining to an event or subject of inquiry; a firsthand or eyewitness account of an event Main Entry: secondary source Part of Speech: n Definition: any document that ...
September 4, 2007
a force of 10 N holds an ideal spring with a 20-N/m spring constant in compression. The potential energy stored in the spring is..? 0.5J, 2.5J, 5.0J, 10J, or 200J? POtential energy? Wouldn't it be 1/2 kx^2, but x= F/k, so 1/2 kx^2= 1/2 k*F^2/k^2 and that can be reduced.
May 2, 2007
The length of a rectangle is 2 times its width and its perimeter is 42 cm. A ssquare is formed by putting together 2 rectangles like this. Find the length and width of the edge and the area of this square. "A ssquare is formed by putting together 2 rectangles like this.&...
April 14, 2007
How many moles of propane are expected from the complete reaction of 82.8 g of propene? How many grams of propane are expected from the complete reaction of 101 g of propene? Kyle-- Here is a problem I worked last night for Kira (about half way down the page). It should give ...
April 5, 2007
a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3? how do you do this? moles of solution: 5.8*.0458 moles Grams of solute= moles*molmassKNO3 Volume of 15g= 1000ml*15/gramssoluteabove
April 5, 2007
7th Grade Poetry
Is "a bark of rust" a metaphor? I need to analyze the poem New Hampshire by Donald Hall and the line I'm having difficulty with is: "a bark of rust grows on the tree of a gas pump;" Thank you! yes, that could be a metaphor
April 3, 2007
7th Grade Math
Please help - I don't know where to begin. My problem is this: Find the numbers "Y" and "Z" if (1 and 3/5 times "Y") + (3/5 times "Z") = 5 AND (1 and 3/5 times "Z") + (3/5 times "Y") = 6. Thank You! change 1 and 3...
March 22, 2007
Solve the compound inequality -1 < X - 2 LESS THAN OR EQUAL TO 7 Your problem: -1 < x - 2 ≤ 7 Add 2 to all three quantities to get x by itself: -1 + 2 < x - 2 + 2 ≤ 7 + 2 1 < x ≤ 9 Solution set can be expressed this way using interval notation: (1...
March 20, 2007
A mixture of chromium and zinc weighing .362 g was reacted with an excess of hydrochloric acid. After all the metals in the mixture reacted 225 mL of dry hydrogen gas was collected at 27 C and 750 torr. Determine the mass percent Zn in the metal sample. [Zinc reacts with ...
March 4, 2007
A golfer hits a ball off the ground with an initial velocity of 200 ft/s at an angle of 23 degrees. The green is 750 feet away. Will the shot make it to the green? State by how much it makes or misses the green. What is the vertical velocity? 200*sin23. ANSWER So how long will...
February 4, 2007
A golfer hits a ball off the ground with an initial velocity of 200 ft/s at an angle of 23 degrees. The green is 750 feet away. Will the shot make it to the green? State by how much it makes or misses the green.
February 3, 2007
The "executive privilege" that relates to the right of the president to keep communications confidental is best described a/an: 1. power that is only applicable to matters of national security. 2. absolute power that applies to all communications that a president ...
January 23, 2007
U.S. Government --Need Help!
The "executive privilege" that relates to the right of the president to keep communications confidential is best described a/an: A. power that is only applicable to matters of national security. B. absolute power that applies to all communications that a president ...
January 22, 2007
Is it possible for a cup of water to completely evaporate in a room with a constant temperature of 21ºC??? Yes, of course. Why would you think it would not? A wet towel will dry, right? but why is that? The Kinetic Molecular Theory, distributed velocity /energy in ...
January 22, 2007
A/An__________ is a citizen who is involved in the political process and only supports canidates who want to enact laws that would allow prayer in public schools. Is this a candidate activist or a issue activist? I'm thinking this is an issue activist, am I correct? I ...
January 21, 2007
U.S. Government--Need Help !
I have this question on an assignment and I need help. Many believe that political parties are incapable of serving as an avenue for social progress because: A. party positions change so frequently. B. the leaders who draft party platforms are generally out of touch with the ...
January 21, 2007
Which statement best describes how states derive powers from the U.S. Constitution? 1. The Constitution does not mention anything about state powers. 2. The Constitution only grants states the power to levy taxes and regulate commerce. 3. The Constiution grants states all of ...
January 19, 2007
What are some analogies for Endoplasmic reticulum and Nuclear Reticulum Go here for endoplasmic reticulum http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=Endoplasmic+reticulum+is+like&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&...
December 30, 2006
I need a 14 letter word, the 4th letter is an o for a crossword puzzle that is a drug that slows down body functions, including breathing and brain activity. Thanks Thank you for using the Jiskha Homework Help Forum. Hopefully, you are looking for: chlorpromazine
December 16, 2006
I'm stuck on this problem. Can you help? -4x-9y=1 -x + 2y =-4 WHat is x and y? Two equations in two unknowns. Here is a quick way to solve them -4x - 9y = 1 4x - 8y = 16 (I got that my multiplying both side so the secind equation that you provided by -4) Now add the two ...
December 5, 2006
if a 13 by 9 inch brownie pan is divided into 20 equal size brownines, what are the dimensions of one brownie? Divide 13 by 5, and 9 by 4 To get the dimensions. 13 divided by 5 is 2 3/5 9 divided by 4 is 21/4 please explain or show equation in fractions
November 29, 2006
Hi, I am having trouble determining the correct answer for this question. Which one of the following decay modes has not been observed? A)neutron emission B)Positron emission C)Alpha emission D) electron capture I don't know what does it mean be "observed." If I ...
November 25, 2006
Factor m^2-k^2+6k-9 ^2 means squared. The answer is (m-k+3)(m+k-3) I want to know how to get that. Thanks. Look at this: m^2 - (k^2 -6k + 9) m^2 - (k -3)^2 Now that is the difference of two squares... Thanks!!
October 9, 2006
Factor m^2-k^2+6k-9 ^2 means squared. I don't know any other way to type it. Thanks. Seems to me you can only do this in 2 pieces...factor the first 2, then the last 2... (m+k)(m-k) + 3(2k+3) Whadya think? hmmm... I looked in the back of the book and it says... (m-k+3)(m+k...
October 9, 2006
Factor 2ab(c-d)+10d(c-d) I would like to know how to do this. Thanks. (c-d) is a common factor, so you pull it out: (c-d)(2ab + 10d) Oh, then you can pull a 2 out: (c-d)(2)(ab + 5d) Thanks! you're welcome!! What do the letters stand for tell me @ I will tell you the answer...
October 9, 2006
hi I am learning about Hydrocarbons, and naming them is there any steps I shoul follow when naming them becuase I honeslty don't understand! thanks for your help!!!1 First of all you should know that rules govern the IUPAC system. I would learn that system since everyone ...
June 16, 2006