Friday
July 3, 2015

Posts by tim


Total # Posts: 1,015

Math
You have equally likely chance of choosing any number from 1 to 10. What is the probability that you choose a number greater than 6?
April 15, 2012

physical science
a hammer falls off a rooftop and strikes the ground with a certain kinetic energy. if it fell from a roof twice as tall, how would its kinetic energy compare? explain
March 29, 2012

College Physics
An electron with a speed of 1.9 × 107 m/s moves horizontally into a region where a constant vertical force of 5.4 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it ...
March 28, 2012

Maths
There are two trains. The first train is travelling at 52 km/h. The second train is travelling at 68 km/h. It takes 9 seconds for the second train to pass the first train. How long is the second train?
March 28, 2012

Biology
If nonessential amino acids are missing from the diet, can essential amino acids be substituted in the protein? I would appreciate some help with this one-thank you
March 24, 2012

biology
Traits like human height and skin color shows a wide range of phenotypes, as opposed to just two ot three. From the standpoints of genese and alleles, explain why is this so.
March 19, 2012

MATH
74.25
March 17, 2012

geometry
Two similar solids have a scale factor of 3:5. If the height of solid I is 3 cm, find the height of solid II. If the surface area of I is 54pi cm squared, find the surface area of II. If the volume of II is 250pi cubed, find the volume of I
March 13, 2012

math
85%of36145
March 9, 2012

stats
The vice-president of a business firm has reviewed the records of the finn's personnel and found that 70% of the employees read The Wall Street Journal. If the vice-president was to choose 12 employees at random,what is the probability that the number of these employees ...
March 1, 2012

Physics
A bag of blood with a density of 1050 kg/m3 is raised 1.37 m higher than the level of a patient’s arm. How much greater is the blood pressure at the patient’s arm than it would be if the bag were at the same height as the arm? Assume there is no change in drip speed ...
February 28, 2012

stats
please help How do you construct a pay of table?????? . Dr. Mike Adams, a local brain surgeon, believes there is a lot of money to be made renting apartments to students here in Alamosa. He is considering constructing one, two, or possibly three apartment complexes, each of ...
February 27, 2012

math
I want to put a 3ft wide walk around a 10ft by 15 ft pool. What is the perimeter around the figure including the path?
February 27, 2012

STATS
The vice-president of a business firm has reviewed the records of the firm's personnel and found that 70% of the employees read The Wall Street Journal. If the vice president was to choose 12 employees at random, what is the probability that the number of these employees ...
February 27, 2012

stats
. Each week during the first half of the semester, a sample of 50 students was polled to determine how many of them had their homework done before class. The following arc the results of the weekly polls: Week # # of students with homework done 1 1 2 8 3 12 4 14 5 22 6 30 7 25...
February 26, 2012

stats
20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next ...
February 26, 2012

statistics
12. A statistics student received a grade of 85 on a statistics midterm. If the corresponding z score equaled +1.50, and the standard deviation equaled 7, what was the average grade on this exam? a. 95.5 b. 74.5 c. 78.0 d. Cannot determine without knowing how many took the ...
February 26, 2012

stats
if one can choose any six of 40 numbers, in any order, to play a state lottery game, how many different arrangments are possible?
February 26, 2012

physics
A pitched ball is hit by a batter at a 45° angle and just clears the outfield fence, 90 m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance.
February 25, 2012

physics
A ball rolls with a speed of 6.4 m/s toward the edge of a table that is 0.7 m above the floor. The ball rolls off the table. a. Find the magnitude of the balls velocity when it hits the floor. m/s b. At what angle, measured from the horizontal, will the ball's velocity ...
February 25, 2012

Physics resistance question
No drop
February 21, 2012

stats
The sponosor of a local soccer tournament is responsible for writting an article for the local paper announcing the 1st, 2nd, 3rd place winners.If 10 teamsare invited to the tournament, ans th sponsor wanted to get the article written in adance so it can go out in the next ...
February 20, 2012

trig
The minute hand of a clock is 6 inches long. What distance does its tip move in 16 minutes?
February 20, 2012

psychology
what are some movies that is related to the issues of child development and developmental psychology
February 20, 2012

psychology
What are some movies that is related to the issues of child development and developmental psychology
February 19, 2012

Physics
The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration −5.15 m/s2 for 4.20 s, making skid marks 62.1 m long that end at the tree. With what speed does the truck then strike the tree?
February 7, 2012

Mathamatics 101
An angle is 35 degrees more than 4 times its supplementary angle. Find the measures of the two angles.
February 5, 2012

chemistry
how much water should i add to neutralize 1000 milliliters oh ph 13
January 31, 2012

calculus
Find area of the region under the curve y = 5 x^3 - 9 and above the x-axis, for 3¡Ü x ¡Ü 6. area = ??
January 27, 2012

math 242
It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 7% per year. If the current demand is increasing by 7000 units per year and if the price remains fixed at $100 per unit, how much revenue will the ...
January 27, 2012

Biology
Cells absorbing sugar or other small molecules from their surroundings is an example of A. diffusion B.osmosis C. exocytosis D.endocytosis I think it is either C or D because they both have to do with the transportation of molecules in and out of cells.
December 30, 2011

math
V = pir^2h V = pizza :)
December 29, 2011

math
The radius r of a sphere is increasing at the uniform rate of 0.3 inches per second. At the instant when the surface area S becomes 100pi square inches, what is the rate of increase, in cubic inches per second, in the volume V?
December 29, 2011

BUSS/STATS
Steve cutter sells big blade lawn mowers in his hardware store, and he is interested in comparing the reliability of the mowers he sells with the reliability of Big blade mowers sold nationwide. Steve knows that only 15 percent of all Big Blade mowers sold nationwide require ...
December 27, 2011

bio
How is it possible for an overnourished individual to be malnourished?
December 18, 2011

Calculus
Thanks again for responding. When we earlier did h=0, the formula was dh/dt=5/2pi=.8 in/min. Intuitively, it makes sense that the rate would reduce as the cup is filling up since the radius is increasing. So, should the answer above have 10 in the numerator instead of 40. Then...
December 18, 2011

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast is the water level rising now?
December 18, 2011

Calculus
In the 2nd question (rate of water rising now), how do you calculate r?
December 17, 2011

Calculus
OK, I understand now. Thanks for all of your help.
December 17, 2011

Calculus
Thanks. I think that I understand the 1st question now. How about the other questions?
December 17, 2011

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast was the water level rising 4 minutes ago? How fast is the water level rising now? What will the rate be when ...
December 17, 2011

physics
So I figured this out myself a=v^2/r which is also equal to (4pi^2*r^2)/T^2 and T is 86400 secs which is how long it takes for a day to pass
December 15, 2011

physics
How would I know W if that wasn't given?
December 15, 2011

physics
radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks
December 15, 2011

physics
should be 2.24m/s use the equation F=m(v^2/r)
December 15, 2011

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary
December 12, 2011

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary
December 12, 2011

algebra
write an equation of the direct variation that includes the given point, (-5/6, 6/5)
December 11, 2011

article
articles either about animals or specific ecosystems
December 11, 2011

article
where can i find articles on the ecosystem ?
December 11, 2011

6th grade Science
Please help me with the questions? 1) How do you respond to some stimuli in your environment? The examples I wrote are: If I am hungry, I will eat food. If I am cold, then I will put on a jacket? 2) What does the fur of a bear have to do with homeostatis? I wrote that the fur ...
December 9, 2011

Calculus
its from 1 to 3 on the x axis including when it crosses underneath, you subtract that (its like negative area)
December 8, 2011

Calculus
Finding area under a curve From [1,3] 2x^2 -4x +1
December 8, 2011

Physics
Divers dive straight out from a cliff that is 21 m high. If the rocks below the cliff extend outward for 15 m, what is the minimum horizontal velocity a diver must have to clear the rocks safely
December 4, 2011

ochem
how to determine equivalent hyfrogens in hnmr?
December 3, 2011

chem
why do we use a weak acid or water and not a concentrated acid with NaBh4,etoh reagent?
December 2, 2011

Math
The equation y=2x+7 represents a linear relationship that is non-proportional. What changes could I make to the equation to make it proportional? Thanks
November 29, 2011

Economics
Variable cost divided by the change in quantity produced is A. average variable cost. B. marginal cost. C. average total cost. D. None of the above is correct.
November 29, 2011

pol sci
what impact is the California dream act( ab 131) going to have on us citizens or legal immigrants?
November 26, 2011

soc..
write a essay describing de jure segregation include why was it established , what happen with de jure segregation from reconstruction to the civil rights movement , and how was jim crow enforced throughout this period
November 26, 2011

busi/stats
list 3 ways we can reduce the size of a sample, none of which has any direct relationship to the size of the population
November 22, 2011

busi/stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...
November 22, 2011

math
hi
November 19, 2011

Spanish 8th grade
I have to put these in the past tense-Are they correct? 1. Tú hablas por teléfono. Tú habaste por teléfono. 2. Nosostros bailamos mucho los fines de semana. This would be the same in past tense, I think?? 3. Tú y yo cantamos los domingos. ...
November 16, 2011

Spanish
Thank you
November 16, 2011

Spanish
Could you please check these-I had to answer the questions. 1.¿Bailaste ayer? Sí,yo bailé ayer. 2.¿Caminaste a la escuela hoy? Sí, yo caminé a la escuela hoy. 3.¿Visitaste a tus primos el domingo pasado? Sí, yo visit&...
November 16, 2011

physics
can some one explain how to do this The muzzle velocity of 60g bullet leaving 4kg rifle is 500 m/s towards the east. What is recoil velocity of the rifle?
November 16, 2011

geometry
if area of triangle wxz is 48 cm squared, x =10 cm, xz = 10 cm, middle =8 cm then what is the perimeter of wxz
November 15, 2011

stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...
November 11, 2011

stATS
the standard deviation of the sampling distribution of the means is ____the standard deviation of the population under study.
November 4, 2011

Chemistry 121
Is 450g of oxygen enough to burn 125g of butane according to the following equation? C4H10 + O2 ---> CO2 + H2O? show why or why not?
November 3, 2011

Chemistry 121
How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?
November 3, 2011

Chemistry 121
How much oxygen would be needed to completely burn 250g of propane?
November 3, 2011

Calculus
A ship sailing parallel to shore sights a lighthouse at an angle of 12 degrees from its direction of travel. After traveling 5 miles farther, the angle is 22 degrees. At that time, how far is the ship from the lighthouse?
October 23, 2011

chem
Explain clearly why changes in base concentration do not affect the observed reaction rate of an E1 elimination.
October 23, 2011

chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.08 M C2H3O2-. What is the pH of the resulting solution?
October 21, 2011

chemistry-acid/base extraction.
I do not understand acid base extraction. why should we mix, for example, an organic and aqueous compound to then separate them from each other. please explain confused....
October 21, 2011

Algebra
Find the percent of error of each measurement. 0.2cm 0.4cm
October 20, 2011

Algebra
This is soooo confusing! An airplane flies from New Orleans, Louisiana, to Atlanta, Georgia, at an average rate of 320 miles per hour. The airplane then returns at an average rate of 280 miles per hour. The total travel time is 3 hours. A. Define a variable for the flying time...
October 14, 2011

Algebra
Yeah, I did it right! Thank you!!
October 14, 2011

Geography
Following the breakup of the Soviet Union, what are some of the major problems faced by many of the new countries? Thanks.
October 13, 2011

buss/stats
what is it called when all the items in the population have the same chance of being selected for the sample?
October 8, 2011

question
thank you very much
October 5, 2011

question
But critical writing like argumentative essays have structure. (can you tell me what is wrong with this message?)
October 5, 2011

physics
What quantity is given by the gradient of such a graph?
October 2, 2011

Math
Edit...25 balls in the bowl..
October 1, 2011

Math
There are 20 balls in a bowl. 7 black, 6 blue, 5 green, 4 red, and 3 yellow. Balls must be drawn until 4 different colors are drawn. What is the probability that one is black? Please walk me through if you can...
October 1, 2011

math
31
September 30, 2011

Physics 9th grade
no
September 26, 2011

math
On a board game if you landed on red you move ahead 1 space,land on blue you move ahead 2 spaces,and land on orange you move back 1 space. If you took 30 spins where would you expect to land relative to where you started?
September 22, 2011

American Government
In The Declaration of Independence how did they signify the colonists’ relationship to Britain?
September 19, 2011

English
what is John updike`s message in this paragraph? The next morning, I went back to the open vantage from which we had watched the tower so dreadfully slip from sight. The fresh sun shone on the eastward façades, a few boats tentatively moved in the river, the ruins were ...
September 13, 2011

physics
a stone tied at one end of a string of length,l is whirled in a horizontal circle with constant linear speed,v.which of the following expressions describe the relation between the radius of the circle,r and the angle between the string and the vertical axis?
September 11, 2011

social studies
Although the Chesapeake and New England colonies differed in many ways, relations with Native Americans followed a similar course in both regions. Why? What were the biggest factors in relations between the two sides? Did relations change over time and why?
September 10, 2011

social studies
in what ways?
September 10, 2011

social studies
In what ways did English settlement patterns differ according to region and environmental factors?
September 10, 2011

Psychology
Can anyone explain to me what they are trying to ask in this question. What is the difference between the Sympathetic Nervous System response and the HPA Axis in terms of both process and function?
September 8, 2011

buss/stats
Sorry the full question is A loaf of bread is normally distributed with a mean of22 oz. and a standard deviation of 0.5 oz. a, what is the probability that a loaf is btwn 22.75and 23.00? B, 5% of the loafs will weigh less than_____ ounces? C, assuming 200 loaves are baked on a...
September 6, 2011

bussi./stats
what is the probability that a loaf of bread is between 22.75 and 23.00?
September 6, 2011

Math
Write the rectangular equation in polar form. (x – 4)2 + y2 = 16
September 5, 2011

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