Tuesday
July 29, 2014

Posts by CM


Total # Posts: 90

Physics Classical Mechanics
This is part of an 8.01x problem. Answers should not be given untill the deadline!! Cheaters will be banned from 8.01x!

Physics
A block of ice at 0 degrees C, whose mass is initially 40.0 kg, slides along a horizontal surface, starting at a speed of 5.26 m/s and finally coming to rest after traveling 22.5 m. Compute the mass of ice melted (in grams) as a result of friction between the ice and the horiz...

Physics
A cylindrical copper rod of length 1.20 m and cross-sectional area 5.60 cm^2 is insulated to prevent heat loss through its surface. The ends are maintained at a temperature difference of 100 degrees C by having one end in a water-ice mixture and the other in boiling water and ...

science
My apology. I posted the previous question in correctly. Here is the question again: To bring 100cc of water from 20C to 75C, in 1min 25 sec, with 650Watt of energy input, what is the temperature required?

Science
if 500Watt of energy is supplied, how long does it take to heat up 100 cc of water from 20C to 75C? Thank you for your assistance,

Physics
I need a step by step visual of how to do this question: A uniform horizontal beam 5.00m long and weighing 3.00x10^2 N is attached to a wall by a pin connection that allows the beam to rotate. Its far end is supported by a cable that makes an angle of 53 degree with the horizo...

Physics
A uniform ladder 10.0m long and weighing 50.0N rests against a smooth vertical wall. If the ladder is just on the verge of slipping when it makes a 50 degree angle with the ground, find the coefficient of static friction between the ladder and ground.

statistics - please help
A researcher wishes to be 95% confident that her estimate of the population proportion of individuals who travel overseas is within 4% of the true proportion. Find the sample size necessary. In a prior study, a sample of 200 people showed that 80 traveled overseas last year.

statistics
according to data from the american medical association, 10% of us are left handed. If three people, are randomly selected find the probability that they are all left handed. If groups of 50 people are randomly selected, what is the mean and stadard deviation of left handed pe...

statistics
The winning times (in seconds) of women in the 100-meter dash for consecutive summer Olympic games are listed below. Assume that the times are sample data from a larger population: 11.07 11.08 11.06 10.97 10.54 10.82 10.94 10.75 10.93

Heat Production (Animal Phy)
Assume that an animal consumes 200 ml of O2 in the course of metabolizing 250 mg of food. Determine the probable kind of food the animal has metabolized. How much heat has been produced? I determined the food type by dividing 200 by 250 to get 0.8 ml O2/mg, which is close to t...

Physics
The brakes on your automobile are capable of slowing down your car at a rate of 4.2 m/s^2. a) If you are going 145 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 90 km/h speed limit? b) Graph x vs. t and v vs. t for such...

Calc. Help Please.
Find the value of the definite integral using sums, not antiderivatives: int= integral sign int((x + 2)/(x^(3/2)),x= 16..25)dx Please help... even just showing me how to get started would be greatly appreciated.

Calc.
Find the value of the definite integral using sums, not antiderivatives: int= integral sign int((x + 2)/(x^(3/2)),x= 16..25)dx Please help.

Spanish-Please check my work-Thanks
yes excellent spelling

English word
put on a poker face?

CALC HELP ASAP
suppose you need to construct a cone who surface area is 100 sq in. (A= pi*r*(sqrt( r^2+h^2), this is the amount of carboard needed to construct the cone. find values of r and h that will maximize the volume of the cone (V= (pi/3)r^2h Please help. explanations and steps please...

Calculus
The manager of a weekend flea market knows from past experience that if he charges x dollars for a rental space at the market, then the number y of spaces he can rent is given by the equation y= 200-4x. Is this correct? Slope represents the relationship between amount charged ...

algebra
find the equation for the line that passes through the point (-5,-1) and that os parallel to the line with the equation -x+2y=5

math
If a right triangle has a base of 4 inches and a height of 3 inches, make an equivilant triangle with a base of 17 inches. Can someone explain how to figure this answer?

healthcare financial
ratio analysis

Stats HELP PLEASE
For convenience you may assume the dice are different colors. Suppose you roll the 5 dice seeking to get as many sixes as possible. how many ways can you get exactly 3 sixes on the first roll? How many ways can you get at least 3 sixes on the first roll? Suppose you only got 1...

Stats HELP PLEASE
The game of Yahtzee is played with five fair six-sided dice. A turn consists of rolling all five dice, selecting the ones you want to keep, re-rolling the rest, and then doing this one more time, if necessary. You need to match certain conditions in order to score points. (For...

Stats Anyone?
a) One dormitory suite holds 6 first year students. what is the probability that at least four of those students return for their sophomore year? b) suppose that this college admits 500 new first-year students every year and has had a retention rate of 75% for a long time. wha...

Stats Anyone?
The first-year retention rate is the percentage of entering freshman at a given college who return to that same college for their sophomore year. Many colleges use the first-year retention rate as one measure of their quality. Suppose that the first-year retention rate at a gi...

Stats
EC= eye color RFL= ring finger longer RFNL= ring finger not longer EC RFL RFNL Total Blue 20 17 37 Brown 27 22 49 Green 15 7 22 Other 12 5 17 Total 74 51 125 D) What is the probability that the student selected has green eyes and a ring finger longer than his/her index finger?...

Math- Graphing Calculator Use
I'm trying to figure out how to find the Q1, Q3, mean, standard deviation, median, and correlation coefficient. My manual is not clear. It says go to VARS and Statistics and then I can choose from there but I don't know how to get the answers it keeps saying error. I t...

stats
write a brief paragraph addressing the question. Which is more likely, that a person is killed by lightning, or that a person is killed by lightning while playing golf in a thunderstorm? I believe it would be while playing golf due to holding the metal golf club, acting as a l...

stats
You pick 2 M&Ms from a large bag. What is the probability that 1) at least one is brown? 2) not all are blue? brown=13% yellow=14% red=13% blue=24% orange=20% green=16% 1) P(at least one M&M is brown) = 1 - P(no M&M is brown) = 1 - (0.87) = 0.13 Is this correct? 2) P(not all M...

Stats
Thank you.

Stats
When asked about their driving, 56% of students say they are better than the average driver, 39% say they are an ave. driver and the rest say they are worse than ave. A pair of students are driving home together for break. What is the probability that at least one student said...

org. chem.
Name some advantages of using acetaminophen (tylenol) instead of aspirin as an analgesic.

Stats
Suppose that you are given the following information about the freshman year GPAs and the SAT scores of students entering a certain college: Mean SAT= 1125, Standard Deviation SAT= 150, Mean GPA= 2.68, St. Dev. GPA= 0.82 and r=0.65. a)Use the above information to compute the r...

org. chem.
A student who was isolating aspirin stopped the experiment after the filtration step with alumina. One week later, the methanol was evaporated and the experiment was completed. The melting point of the aspirin was found to be 110-115 degress Celsius. Explain why the melting po...

stats
SAT math scores approx. follow a normal distribution, with mean 500 and standard deviation 100. What % of students should have an SAT math score above 500? I think I use mean (500) + z-score * SD (100), but I do not know how to get the z-score?

stats
The height of adult women in the U.S. is normally distributed, with a mean height of 64 inches and a standard deviation of 3 inches. With this in mind, answer the following: a) The shortest 10% of women are shorter than what height? b) The middle 75% of all women are between w...

Stats
That equals 2.12. So, I use the z-score from the 20% and 90% and the 2.12 SD, but what do I use for the two means or top numbers when standardizing?

Stats
I'm not sure where you get the 2.32 SD from? And would I use the percentages or months in the calculation with what mean?

Stats
Suppose that you find out that 20% of all babies say their first word by the time they are 13 months old, and that 90% of all babies say their first word by the time they are 22 months old. Assume that the age at which a baby says its first word is normally distributed. Find t...

Stats
The height of adult women in the U.S. is normally distributed, with a mean height of 64 inches and a standard deviation of 3 inches. With this in mind, answer the following: a) The shortest 10% of women are shorter than what height? b) The middle 75% of all women are between w...

Stats
0 3344447 1 01255 2 3 3 6 5 4 8 0 10 58 12 0 13 00 15 7 19 0 20 6 21 7 I figured out the 5-number summary but salaries will be one axis and what will be the other?

Stats
Make a boxplot of the salaries. To the right is a stem-and-leaf plot of the salaries for the 2006 New York Yankees. The stems are millions of dollars; the leaves are hundreds of thousands. For example, the "5|4" represents the 5.4 million dollars earned by Kyle Farns...

college-essay
Just by glancing over the essay I found several grammatical errors. Be sure to proofread carefully.

Stats
the chart displays number of clubs (0-9) and the # of students involved in a certain # of clubs. I need to create an appropriate display of the data, but I am not sure whether to use a bar graph or histogram because I am not sure whether the variable is categorical (bar graph)...

Stats
A few years ago, researchers investigated how many clubs students were involved in at a small liberal arts college in the Northeast. The results of their interviews of 92 students are tabulated below: number of clubs students 0 18 1 12 2 15 3 16 4 17 5 9 6 3 7 0 8 0 9 2 a. Cre...

Org. Chem.
It seems logical to me. One last question: What does a distribution coefficient of one (K=1) indicate about a compound's solubility between organic and aqueous phases? I think I remember my teacher saying that it is impossible to have a K=1?

Org. Chem.
Here is what a worksheet says. Assume 50 mg of a compound was extracted between equal volumes (2 ml) of water and methylene chloride. Calculate the distribution coefficients for each compound, given the following results: a. 1 mg of sodium benzoate was recovered from the methy...

Org. Chem.
this is a problem from an experiment we did not perform, but have to answer... that is why I do not know what values to use for the division?

Org. Chem.
Is there a correlation between the values of the distribution coefficients and the polarities of the three compounds? Explain. Place 0.050 g of one of the solids (benzoic acid, succinic acid, or sodium benzoate) in a vial and add 2 mL of methylene chloride and 2 mL of water. C...

Org. Chem.
Thank you very much.

Org. Chem.
what is the precipitate formed when HCl is added? I believe the answer is NaCl, but I am not sure and this precipitate only formed in the first NaOH extract, as precipitate was essentially nonexistent in the 2nd extract? Below is what was done in the experiment. Also, does the...

org chem
describe the hybridization (sp3, sp2, sp) of the following bonds. BH3 (all single bonds) Is it sp2? H-C triple bond C-H Is it sp? A double bond with two methyls connected at each end Is it sp2? Please Help ASAP

Comparative Anatomy
Which parts are of epidermal origin; of dermal origin? -Horns -Antlers -Claws -Nails -Hooves -Teeth -Whale Baleen -Scales on Tails Please help and an explanation would be greatly appreciated... I am trying to study for a lab quiz. Thanks!

Chemistry
Thanks

Chemistry
In an acid/base titration, why must the indicator (phenolphthalein) be a strong dye?

biology
If you have a gene pathway with three activities, say A, B and C, and you have a mutant where an area of the pathway is affected, what kind of experiment would allow you to distinguish if A, B or C is affected? Does it make sense to plate the mutant starting with the C source ...

college chemistry!! need help now!!
sorry about that,i am just so busy.i am a really good student at chem,just had a really big doubt.the question was confusing and i thought mayb GK mistook it as well. but it wont happen again

college chemistry!! need help now!!
thanks so much!! i thought it had something to do with partial pressures.

college chemistry!! need help now!!
An adult takes about 15 breaths per minute, with each breath having a volume of 500mL. if the air that is inhaled is "dry", but the exhaled air at 1 atm pressure is saturated with water vapor at 37 degree C(body temp), what mass of water is lost from the body in 1hr?...

college Chemistry
the question was ....but the exhaled air at 1atm pressure is saturated with water vapor.....

college Chemistry
but the air that came out has a pressure of 1atm. doesnt that mean it has the partial pressure of air and water in it??

college Chemistry
An adult takes about 15 breaths per minute, with each breath having a volume of 500mL. if the air that is inhaled is "dry", but he exhaled air is 1 atm pressure is saturated with water vapor at 37 degree C(body temp), what mass of water is lost from the body in 1hr? ...

algebra, equations
what exactly are you trying to find?

american history
America

american history
true or false? During the 1970s, the southern and western areas of the nation grew more rapidly than the northeastern areas. **sorry...my book doesnt say anything about this

American History
1. Realpolitik was a campaign to bring honesty back to the political culture of the United States after the Vietnam War. ---------------------my answer: True? Realpolitik is political realism or practical politics, esp. policy based on power rather than on ideals. 2. American ...

american history
1. In 1975, two years after U.S. forces had pulled out of Vietnam, the a. non-Communist forces defeated the Communists. b. Cambodian forces took over most of Vietnam. c. Laotian forces took over most of Vietnam. d. Communist forces took over South Vietnam. --------------------...

American History
John Kennedy was fortunate to inherit a vibrant economy when he took office in 1960. -----------------------my answer False? the economy wasnt good before he stepped in the for presidency. During his presidency, he boosted the economy mostly by increasing spending on defense a...

American History
Hundreds of antiwar protestors were injured or jailed as a result of demonstrations outside the Republican convention in Miami Beach in 1968. ------------------my answer: False? my took talks about campus students participating the protest and then the amount of ppl grew to 2...

American History
1. The Eisenhower presidency, despite two recessions, was for the most part a period of continuing economic prosperity in the United States. ----------------------my answer: true Because during president Eisenhow's presidency, the economy grew rapidly and brought prospeity...

American History
True or False The population of the United States dropped sharply after World War II. -----------------my answer: True Because world war II resulted in more deaths and destroyed more propertey than any other was in history. is it right?

American History
Critics of American policy in Vietnam claimed all of the following except that a. the war was a civil conflict in which the United States had no part. b. the president had subverted the role of Congress in declaring war. c. the North Vietnamese Communists were armed with nucle...

American History
The city where Orval Faubaus sought to prevent black students from attending Central High School was a. Montgomery b. Greensborr c. Little Rock d. Tuskegee --------------------------my answer: C? Because Orval Faubus is a Arkansas governor who defied federal court order to int...

American History
The three main issues of the 1968 presidential campaign between Richard Nixon and Hubert Humphrey included all of the following EXCEPT a. violence and disorder b. the energy shortage c. racial unrest d. the war in vietnam ------------------------my answer: B? vietnam war was s...

American History
True of False??? 1. The Soviets desperately wanted the Allies to open a second front in North Africa to relieve German pressure on the Soviet Union. --------------------my answer: True Becayse in the autumn of 1942, the Russians were tenaciously holding out at a city on the Vo...

American History
---- TRUE of FAlSE??/ 1. The Allies had the upper hand against the Japanese in the Pacific during all of 1942. ------------my answer: True?? ** what does upper hand mean? i dont quite getr the meaning of the question. 2. The Soviet Union established several satellite nations i...

American History
1. Perhaps the most important international result of World War II was a. the emergence of the Cold War. b. Britain's return to world dominance. c. the elimination of Germany from world affairs. d. America's return to isolationism. --------------------------my answer A...

U.S History
1. The organization after WWII that strenghened the militarydefenses of non-communist western Europe was called? A. NATO B. UNICEF C. WHO D. UNESCO --------------------------my answer A? Because NATO is a military alliance established by the signing of the North Atlantic Treat...

American History
1. The organization after WWII that strenghened the militarydefenses of non-communist western Europe was called? A. NATO B. UNICEF C. WHO D. UNESCO --------------------------my answer A? Because NATO is a military alliance established by the signing of the North Atlantic Treat...

American History
1. The Five-Power Treaty, the Four-Power Treaty, and the Nine-Power Treaty were all attempts to a. establish, or fix, national borders. b. exchange ambassadors. c. ensure international peace. d. lower trade and tariff barriers. -----------------------my answer: A? the U.S host...

American History
1. In the 1920s the NAACP stuggles for equal justice for balck american by A. holding militant demonstrations B. Securing congressional action C. Forging stronger tires with the Republican Party D. Filling lawsuits in the courts -------------------------my answer b?? Because f...

us history
All the following contributed to American imperialism after 1890 EXCEPT___________. a. the closing of the frontier b. the desire for gold in Alaska C. industrialization D. Support for a strong navy ________________________A? Imperialism means the policy of extending the rule o...

us history
1. The early social legislation of the first part of the 1900's was designed to improve the a. lives of farmers b. social rank of immigrants c. conditions of wage earners d. wealth of business owners. --------------------C? it's not D because Woodrow Wilson tried to li...

us history
Under the platt amendment, the united states________. a. promised to stay out of the internal affairs of Cuba b. revoked the protectorate status of cuba c. gave cuba independence, under restrictive conditions d. acquired the island of Jamaica and Puerto rice. -----------------...

us history
When Hawaiians announce their intention to end foreign influence on the islands, Ameerican business helped to start a revolution in 1893 to topple the government. ----------------------False? My us history book only talks about foreign influence when american involved in china...

US history
q. Once be became president, Woodrow Wilson, a progressive, was a vigorous opponent of racial segregation. ---------------------False? I know that Woodrow Wilson was a progressice but not sure if he was a vigorous opponent of racial segregation.

us history
1. In 1916, the US sent a military force into Mexico ---------------TRUE? (confused about the date, is it 1914?) 2. A major shortcoming of the progressive movement was its failure to address the issus of _________. a.racism b. woman's suffrage c. unemployment d. political ...

American History
1. Which of the following explains why the study of slavery is difficult for historians? a. Slaves left few firsthand accounts because they were forbidden to read and write. b. Most slaves could read, but the majority of slaves could not write. c. Actually, the study of slaver...

American History
1. All of the following played a major role in causing the depression of 1837 except a. pet and wildcat banks. b. land speculators. c. Van Buren's 1840 reelection. d. the Specie Circular order. 2. Which of the following was not one of the three convictions underlying Jacks...

American History
1. Andrew Jackson exerted the power of the presidency by a. allowing South Carolina to secede from the Union. b. depositing federal funds in the National Bank. c. refusing to be bound by Supreme Court decisions. d. vetoing the Force Act of 1833. 2. The depression of 1837 had i...

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