Posts by Jay
Total # Posts: 1,665
physics 121 hanging sign
A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge of the sign to the ...
July 14, 2010
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 2.7 m down a q = 23° incline. The sphere has a mass M = 4.8 kg and a radius R = 0.28 m. a) Of the total kinetic energy of the sphere, what fraction is translational? KEtran/...
July 14, 2010
Your best taxable investment opportunity has an EAR of 4%. Your best tax-free investment opportunity has an EAR of 3%. If your tax rate is 30%, which opportunity provides the higher after-tax interest rate?
July 14, 2010
In general, the frequency of APs in an afferent neuron is related to the amplitude of the receptor potential in the following way: a. exponentially. b. there is no general relationship. c. logarithmically. d. linearly. thx
July 12, 2010
A scientist wants to combine two metal alloys into 20 kg of a third alloy which is 60% aluminum. He plans to use one alloy with 45% aluminum content, and a second alloy with 70% aluminum content. How many kilograms of each alloy must be combined?
July 5, 2010
extraction lab: suppose that aqueous and organic (diethyl ether) layers were not mixed thouroughly predict the effect that this would have on the results in your answer, consider melting point temperature of benzophenone thx
June 16, 2010
recrystallization question: a student's correctly calculated value for the % recovery of purified unknown solid was 102%. assume that the student performed all steps of procedure correctly. a) comment on the validity of the result (include reasons). b) suggest possible ...
June 14, 2010
child growth development
Researchers have concluded that A. the proportion of REM sleep to N-REM sleep is similar in infants and adults B. REM sleep provides needed brain stimulation to neonates C. REM sleep is mostly absent in neonates D. the proportion of REM sleep to N-REM sleep increases as a ...
June 10, 2010
Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 microCoulomb Sphere B is at x = 55.0 cm, with a charge of 2.00 microCoulomb Sphere C is at x = 57.0 cm, with ...
May 4, 2010
Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 ìC. Sphere B is at x = 55.0 cm, with a charge of 2.00 ìC. Sphere C is at x = 57.0 cm, with a ...
May 3, 2010
the student stopped the first careful titration when a deep pink color was obtained in the flask. On the second trial, the student stopped when a light pink color was obtained. On the third trial, the pink color obtained was very faint and noticeable only when the flask was ...
April 13, 2010
in one the chapter 3 programming challenges you were asked to write a program that converts a celsius temperature to fahrenheit. Modify that program so it uses a loop to display a table of celsius from 0 to 20 and their Fahrenheit equivalents.
April 5, 2010
Well Im assuming the answer is that in order to become a dictator period, they need something, the scapegoat, in order to give a reason for all of the ills of the said country, for example, Adolf Hitlers blaming of the Jews and other minorities for all of the problems of Nazi ...
March 21, 2010
write a program that calculates a customer's monthly bill. it should input customer name, which package the customer has purchased, and how many hours were used. it should then create a bill that includes the input informtion and the total amount due. the bill should be ...
March 10, 2010
two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the direction of the yacht at S62 degrees E. How ...
March 7, 2010
Well i read most of the stuff online, and it seems as he a hero is b/c he took over the boat but also isn't b/c apparently he was short tempered and crazy. I can go both ways but i don't have enough resources to back my paper up.
February 10, 2010
What are we required to do and why are we required to do it? Define how the following theories attempt to provide an answer to the question above Natural Law, Virtue Ethics, and Contract Theory
January 26, 2010
challenges in the Classroom
Respond to the following in 200 to 250 words. In your opinion, what are the most challenging obstacles teachers face when managing the classroom? What strengths do you possess that will help you meet and overcome those challenges?
January 20, 2010
A precious-stone dealer wishes to find the specific heat capacity of a 0.036-kg gemstone. The specimen is heated to 95.0°C and then placed in a 0.17-kg copper vessel that contains 0.086 kg of water at equilibrium at 25.0°C. The loss of heat to the external environment ...
January 18, 2010
Hi! If I have two plants with the genotypes Rrtt and rrTt where red color(R) is dominant over white(r) and being tall(T) is dominant over being short(t).If I complete a Punnet square, will it look loke this: R r r r t Rt rt T rT rT t rt rt t rt rt How can I diagram a cross ...
January 8, 2010
8th grade Algebra I (junior level math)
Hello, I am currently in Unit 4-1 (Ratio, and Proportions) and I don't understand how pairs of ratios could form proportions. Could someone give me step by step instructions? Thank You
December 1, 2009
I'm writing an essay on March by Geraldine Brooks. My thesis statement is: Through the use of diction and syntax, Geraldine Brooks creates two women (Marmee and Grace) who initially represent two extremes of the same person. They are virtually more alike than different. I ...
November 29, 2009
10th grade [URGENT]
Create a journal of your fat intake over a two-day period. Prepare a brief analysis of your fat intake. In your analysis, answer the following questions: How many total grams of fat did I consume? How much saturated, unsaturated and trans-fats did I consume? Was my fat intake...
November 20, 2009
I HAVE AN ASSIGNMENT WHERE I HAVE TO PLOT POINTS ON A GRAPH IN EXCEL, THE INFORMATION GIVEN IS QS=2P-20 AND QD=80-2P AND I WAS TOLD TO USE PRICES 10,20,30,40,50 AND QUANTITIES 5,10,15,20,25,30,35,40 FOR THE GRAPH. I HAVE NO CLUE WHAT TO DO FOR THE CHART IN EXCEL
November 7, 2009
Dean works with baby animals at a Zoo. This week he measured a giraffe, an ape and a tiger. The tiger had grown 4 inches less than the giraffe. The giraffe had grown twice as much as the ape. The baby ape had grown 6 inches since it was measured the last time. How many inches ...
October 24, 2009
Foley systems is considering a new investment whose data are shown below. The equipment would be depreciated on a straight-line basis over the project'S 3 years life, would have a zero salvage value, and would require no additional net operating working capital. Revenues ...
October 19, 2009
Help me I am lost? I do not even know where to start: The shorter leg of a 30°60°90° triangle is 12. What are the lengths of the longer leg and the hypotenuse, to the nearest tenth?
October 7, 2009
A blood donor center conducted a study over a one year period and found that an average of 55 donors per day checked in to the center. What is the probability that on any given day more than 75v donors will check in?
October 4, 2009
In a bank call center, it is determined over a one year period that 30% of the outgoing calls are answered by a live person as opposed to being unanswered or picked up on voice mail. The center makes over 200,000 outgoing calls per year. there is an operator at the center who ...
October 4, 2009
The payments are $95 in year 1, 2 and 3 and $150 in year 3.5. The purchase price is $500. 500 = 95/(1+rate) + 95/(1+rate)^2 + 95/(1+rate)^3 + 150/(1+rate)^3.5 Solving for rate, the rate comes to -4.98%.
September 27, 2009