Total # Posts: 87
A 543-N physics student stands on a bathroom scale in an 805-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 473 N A) Find the magnitude of the acceleration of the elevator.
January 15, 2016
A spelunker is surveying a cave. She follows a passage 120 m straight west, then 210 m in a direction 45∘ east of south, and then 280 m at 30∘ east of north. After a fourth unmeasured displacement, she finds herself back where she started. A. Use a scale drawing to...
January 9, 2016
You throw a small rock straight up from the edge of a highway bridge that crosses a river. The rock passes you on its way down, 7.00 s after it was thrown. What is the speed of the rock just before it reaches the water 29.0 m below the point where the rock left your hand? ...
January 8, 2016
A man throws over a cliff and hears it strike at the bottom in 8 second. The temperature is 25 C. what are the two times ; the time that the stone travels and the time that sound travels ? what is the height of the cliff in meters?
November 25, 2015
Cartoon depicting Standard Oil Bill Sikes is a fictional criminal from Charles Dickens novel Oliver Twist. How does the rhyme characterize Standard Oil? Write your own rhyme to characterize John D. Rockefeller or one of the industrialists. Your rhyme should contain 5-7 ...
August 13, 2015
the problem says: Water flows from a bathtub through a 2.5 diameter plastic pipe to a large air-filled drain...etc Here, i need to know what is the pressure at the air-filled drain? Is it equal to the atmospheric pressure? Thanks in advance.
December 21, 2014
Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s. tow second later a 20 g bullet is fired at 250 m/s into the rising baseball . how high will the combined bullet and baseball rise.
December 6, 2014
Actually this is an interesting topic since it requires looking at the geographic extent of the Arabic language before and after the spread of Islam. Although not every Muslim speaks Arabic today, the geographic extent of the Arabic language being spoken was greatly increased ...
November 30, 2014
Your boss has asked you to investigate the types and uses of social media that might be appropriate in the workplace. In addition, you are also asked to compare and contrast the services and provide a recommendation that would be suitable to your companys goals. ...
October 8, 2014
Grammar - INTERJECTION
Ho, ho! That was a good joke. Good heavens! You won the first price. Oh dear! You should not done that Bravo! You have won the prize. have you spent all your pocket money? Tut-tut! Did you break the cup. Hush! The king is going to speak
May 12, 2014
grammar - conjanction
Choose the following words to combine these sentence. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3) Mother told us not to...
April 8, 2014
Fill in the blanks with the chosen words. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3) Mother told us not to eat. It was...
April 3, 2014
engineering (logic systems design)
Two flip-flops are connected as shown below. The delay represents wiring delay between the two clock inputs, which results in clock skew. This can cause possible loss of synchronization. The flip-flop propagation delay from clock to Q is 10 ns < tp < 15 ns, the set-up ...
October 3, 2013
PROCESSING CLAIMS. Joe takes x hours on the average to process a claim. whereas Ellen's average is 1 hour longer. a) write a rational function C(x) that gives the number of claims that they process while working for an 8-hour shift. b) Find C(c)
April 5, 2013
A pair of ordinary jeans at A-Mart costs $50 less than a pair of designer jeans at Enrico's. In fact, you can buy four pairs of A-Mart jeans for less than one pair of Enrico's jeans. What is the price range for a pair of A-Mart jeans?
January 29, 2013
Jane and Bob are on the same game show. They answer one question, either True or False. The probability that Bob is correct is 70%. The probability that Jane is correct is also 70%. Moreover, the probability that Bob is correct given Jane is either correct or incorrect is ...
January 29, 2013
Investing inhertance.Norman invested one-half of his inheritance in a CD that had a 10% annoul yield. He lent one-quarter of of his inheritance to his brother -in-law at 12% simple interest. His income from these two investments was $6400 for 1 year. How much was the inheritance?
January 29, 2013
A mass m = 17.0 kg is pulled along a horizontal floor with NO friction for a distance d =5.1 m. Then the mass is pulled up an incline that makes an angle è = 30.0° with the horizontal and has a coefficient of kinetic friction ìk = 0.34. The entire time the ...
October 18, 2012
A woman weighing 500 N stands in an elevator that is traveling upward. At a given instant the speed of the elevator as well as the women is 10m/s and both are decreasing at a rate of 2 m/s2 at that instant the elevator is exerts a force on the woman that is
September 4, 2012
1. An aqueous solution contains 0.154 M ascorbic acid (H2C6H6O6) and 0.196 M hydrobromic acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. Can you explain how to do this please? thank you. Also if you can is number 2 missing information or am I ...
April 26, 2012
What volume of hydrogen sulfide is required to produce 161 liters of sulfur dioxide according to the following reaction? (All gases are at the same temperature and pressure.) hydrogen sulfide (g) + oxygen (g)----> water (l) + sulfur dioxide (g)
April 25, 2012
How many moles of hydrogen gas are required to react completely with 807 L of ethylene (C2H4) according to the following reaction at 0oC and 1 atm? hydrogen (g) + ethylene (C2H4) (g)---> ethane (C2H6) (g) Should I use the ideal gas law here?
April 25, 2012
What volume of carbon dioxide is produced when 0.979 mol of calcium carbonate reacts completely according to the following reaction at 0oC and 1 atm? calcium carbonate (s)---> calcium oxide (s) + carbon dioxide (g) Should I use the ideal gas law?
April 25, 2012
What is the equilibrium constant for the reaction of ammonium ion with formate ion? I know that the ionization constant for ammonium ion is Ka=5.6e-10 and for formate Kb=5.6e-11. a) 1.0 X 10-13 b) 5.6 X 10-11 c) 3.1 X 10-6 d) 1.8 X 10-5 e) 3.2 X 105 I dont know what to do? Do ...
April 3, 2012
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than the activation ...
March 1, 2012
A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a) rate = k (A)^2 b) rate = k (B)^2 c) rate = k (A) (B) d) rate = k (A) (B)^2 I think its D because there are 2 moles of B and 1 mole of A. Do you agree with my ...
February 24, 2012
The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which one of the following ...
February 24, 2012
A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 oC versus 25 oC? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast I think it would be A??
February 23, 2012
Okay first lets figure out the equation P+H2---->PH3 balance it now we have: 2P + 3H2 --->2PH3 equation is now balanced. let us now find the reactant in excess 2 moles of P= 3 moles of H2 2(31)g of P = 3(2)g of H2 6.2 g of P= x x= 6.2x6/62= 0.6 g of H2 4 grams of H2 are ...
March 21, 2010
Suppose you are a fill-dirt contractor and you have been hired to transport 400 yd3 of material across a large river. To transport the material, a container must be constructed. The following cost data are available: Each round trip costs $4.20 and material costs for the ...
October 3, 2009
Algebra, PLEASE HELP ME!!!
There are to points : (42,20) , (52,10) m=(20-10)/(42-52)= -1 => m=-1 choose any point from the two points . (42,20)=(x1,p1) p-p1=m(x-x1) => p-20=-1(x-42) p=-x+42+20 => p=-x+62
September 1, 2008
1) cscθ = (-5/3) , θ is in third quadrant 1/sinθ = (-5/3) => sinθ= -3/5 θ= -36.8699 θ is in third quadrant so θ = 36.8669+180 = 216.8669 tan2θ = tan2(216.8669) = 3.42724 = 24/7 answer : c
August 31, 2008