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September 15, 2014

Posts by John


Total # Posts: 6,235

Physics Please help!
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...
February 28, 2012

Geometry
(3X2)x2+(2x7.5)x2+(3X7.5)x2= surface area 3x2x7.5= volume
February 28, 2012

Physics
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...
February 28, 2012

geometry
10/(cos(50))=length of ladder
February 28, 2012

math
Abe has 9 pens. How many more pens does Abe need to have 12 pens. Write an equation.
February 28, 2012

college algebra
You are given the XY coordinates. Take Time to be X, and Temperature to be Y. Create a graph on a Cartesian coordinate system. A) If done correctly your linear Regression should be Y=-10X + 2350. B) Your slope is -10. Meaning that for every 1 minute the pottery cools by 10 ...
February 28, 2012

Taxes
In the US, we have a progressive tax system, which means higher incomes are taxed at a higher rate. But capital gains are not - they are taxed at a flat rate of 15%. This is an example of an institution, a formal "payment" rule, that affects the "tax game"...
February 28, 2012

Student
lmao, I just literally lol'ed at those comments.
February 27, 2012

statistics
In this unit we have worked with scores and their locations within a distribution. This discussion is designed to get you to think a little more about distributions of scores. Shown below are two samples of scores. Input these scores into SPSS and use plots and data ...
February 26, 2012

physics
A ball rolls with a speed of 4.4 m/s toward the edge of a table that is 1 m above the floor. The ball rolls off the table. a. How long is it in the air? s b. How far out from the edge of the table does the ball hit the floor? m
February 25, 2012

math
What is the angle formed if there is a rise of 10 inches over a run of 57 inches?
February 25, 2012

physics
Find the gravitational force exerted by a 0.515 kg mass on a 0.108 kg mass 1.94 m away.
February 24, 2012

physics
Find the acceleration of the block of mass M = 4.79 kg (m = 4.03) (KE = 0.1)
February 24, 2012

physics
A person of mass 84.5 kg is initially at rest on the edge of a large stationary platform of mass 150 kg, supported by frictionless wheels on a horizontal surface. The person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a vertical distance of ...
February 24, 2012

physics
A skater of mass 74.0 kg initially moves in a straight line at a speed of 4.60 m/s. The skater approaches a child of mass 45.0 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?
February 24, 2012

physics
A bowling ball weighing 43.0 N initially moves at a speed of 4.90 m/s. How long must a force of 51.0 N be applied to the ball to stop it?
February 24, 2012

geometry
if a painting has a perimeter of 36 in, and the length of the picture is 8 inches. then what is the width?
February 23, 2012

Physics
Biomedical measurements show that the arms and hands together typically make up 13.0% of a person's mass, while the legs and feet together account for 37.0% . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the ...
February 23, 2012

Economics
B. Suppose there are two goods, Cloth and Food, and two factors of production, labour and capital. Suppose that the production function for each good is "homothetic". Put capital K in the vertical axis and labour L in the horizontal axis. For Cloth production, for ...
February 23, 2012

Physics help please!!!
Biomedical measurements show that the arms and hands together typically make up 13.0% of a person's mass, while the legs and feet together account for 37.0% . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the ...
February 23, 2012

calculus
Evaluate the integral S x/(sqrt(3x-1))dx Use U-Substitution method.
February 23, 2012

College Algebra 1050
Assume you are on a planet with a gravity constant g (instead of 32 feet per second squared) and a speed of sound c (instead of 1100 feet per second), and that you hear the impact of the rock after t seconds. Then the depth of the well is x feet, where your answer depends on g...
February 22, 2012

math
Three pennies are tossed into the air.What is the probability they will match either heads-heads-heads or tails-tails-tails when they land?
February 22, 2012

math
One estimate for the distance from earth to the andromeda galaxy is 2,400,000 light years. What is this distance expressed in scientigic notation?
February 22, 2012

math
jasmine bought 26 pieces of fruit.she bought 6 oranges.she bought twice as many apples as oranges,and twice as many oranges as bananas.she also bought some pears.
February 22, 2012

calculus
Differentiate both sides of the double angle identify sin 2x= 2 sin x cos x to determine an identify for cos x. Find the first derivative, second derivative, third fourth, fifth, sixth, seventh and eighth derivative. Use the results to find the twelfth and fifteenth derivative...
February 21, 2012

chemistry
In a lab experiment I added Br2 to hydrocarbons cyclohexane, cyclohexene, and toluene. A loss of color would indicate a reaction took place. Only the cyclohexene lost color and turned clear. I guess this means that the Br2 broke the cyclohexenes double bonds but why didn't...
February 20, 2012

chemistry- solubility
hydrocarbons nhexane, cyclohexane, and toluene are are insoluable in H2O (i assume because the hydrocarbons are non polar and water is polar) but why are these three hydrocarbons soluable in CH2Cl2?
February 20, 2012

pre-cal
a) S=cA^k b) A=2Ao K=2 S=c(2Ao)^2=c*2^2*Ao^2 S=4cAo^2 therefor the # of species increased by 4.
February 19, 2012

Visual Literacy
What are the factors that determine whether or not a print design can be classified as "good design?"
February 18, 2012

Algebra
STILL DONT GET THIS can anyone explain me this please a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS
February 18, 2012

Algebra
so answer is 1216
February 18, 2012

Algebra
a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS
February 18, 2012

Calculus
An infinite number of points lie on the curve and there is a tangent line at every point. So may they were asking how many times the tangent not exists. The tangent would not exist if the derivative was undefined at some point. Since the derivative is a polynomial it is ...
February 18, 2012

Calculus
v(t)=s'(t)=150-32t set s(t)=200 find out when the rock is 200 feet above the ground. 200=150t-16t^2 t=(5/16)+or-(15-sqrt(97)) 0=150t-16t^2 t=75/8 not 0 because it started on the ground the velocity when it strikes the ground is v(75/8)=-150 the other velocity is v((5/16)+...
February 18, 2012

artist
What inspired Pablo Picasso to paint Weeping woman? Please give some historical context. Thanks
February 18, 2012

Physics help please!!!
so 570rpm*2pirad = 3581.415625 i divide that with rev*1min/60 sec == 59.69 is that correct ??
February 18, 2012

Physics help please!!!
The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be constant, what is the ...
February 18, 2012

physics
Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.20 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 9.00 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision.
February 17, 2012

Geometry
140
February 17, 2012

Physics please help its urgent i need help
A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
February 16, 2012

Physics to drwl please help
A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
February 16, 2012

Social Studies
D I think
February 16, 2012

Wow is there no one to help with physics???
I got the rest bobpursley but for some reason am not getting the right answer for part b which friction=ma but when i put 209(2.1) the answer isnt right
February 16, 2012

Wow is there no one to help with physics???
Thanks bobpursley
February 16, 2012

Wow is there no one to help with physics???
How would you know its all me?
February 16, 2012

Wow is there no one to help with physics???
A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
February 16, 2012

Physics helppp
A crate of potatoes of mass 9.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.69 and μk = 0.41. Find the frictional force (magnitude and direction) on the crate if the crate is at rest. magnitude N? thanks
February 16, 2012

math
Thank you very much. That is what I thought it was, but I wasnt sure.
February 16, 2012

math
You are designing a rain gutter made from a piece of sheet metal that is 1 foot by 5 feet. The gutter is formed by turning up two sides. You want the rain gutter to have the greatest volume possible. Below is the polynomial function that represents the volume of the gutter. ...
February 16, 2012

math
2/3+7/9
February 15, 2012

math
2,500
February 15, 2012

Calculus (Integrals and Derivatives)
It would be -28. For future notice, the integral is going from the interval -3 to 1(from point a to b)...this information will come in handy if you have to take physics
February 15, 2012

Physics
Locomotive exert on a 12560-kg boxcar to make it accelerate forward at 0.38 m/s2. How long will it take the boxcar to reach its cruising speed of 112 km/h (69.6 mph or 31.1 m/s)?
February 15, 2012

Math
If I financed a computer that costs $1500. If the simple interest rate is 21%, how much will the I owe after one month if no payments are made?
February 15, 2012

math: elapsed time
um any other websites
February 15, 2012

math: elapsed time
somebody answer this question, i really need help!
February 15, 2012

math: elapsed time
i need a website that would teach me every thing about elapsed time. it's really kind of confusing to me
February 15, 2012

11Science
Inherited traits
February 15, 2012

math
so it would be like, 5/8 ? 6/7 8,16,24,32,40,48,56,64 7,14,21,28,35,42,49,56 LCD IS 56 so now i do 56/7=8*6=48 6/7=48/56 56/8=7*5=35 so, 5/8=35/56 5/8 (35/56) < 6/7 (48/56)
February 14, 2012

math
so it's like you do this -> 2,4,6,8,10,12 3,6,9,12,15,18,21 4,8,12,16,20 and one more question, what about the numerators? like if you're comparing 3/8 to 2/5 the common multiple is 40. the numerators?
February 14, 2012

math
how do you change them into equivalent decimals and same denominators?
February 14, 2012

math
how to you compare 8 fractions with different denominators including improper fractions?
February 14, 2012

Chemistry
How would you prepare 10.0 Liters of a solution that was 20 parts per million sodium perchlorate in water? What would be the molarity of the solution (assume density is 1.0 g/mL and 1ppm=1 mL/L)?
February 14, 2012

Social Studies 7R - DBQ Essay Check
yes. really n.o.c
February 13, 2012

geometry
3x + y + 7 + 90 = 180 deg. how to solve?
February 13, 2012

physics
differentiate between density,mass and volume. state a formula in terms of mass density and volume. using the formula calculate the volume of a 10kg block of ice
February 12, 2012

statistics
A professor teaches two different subjects (history and sociology) in an ethnically diverse college. She wants to know how much interest students have in prominent political figures. She reasons that knowing this will help her plan for future lectures. She asked students to ...
February 12, 2012

statistics
Now, let’s look at a situation in which we compare three college math teachers to each other with respect to how interested they keep their students. The study was conducted among freshmen enrolled in an introductory course. The unit was quadratic equations. Students were...
February 12, 2012

statistics
. A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, ...
February 12, 2012

statistics
A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, if ...
February 12, 2012

statistics
An art professor was interested in seeing what size group is best to prime the pump so to speak to encourage strangers to gather together in front of various exhibits at her art show, so she set up an experiment. In a municipal building off campus, she asked a group of two ...
February 12, 2012

english
dont fear th1 Crush" - Garbage Local God - Everclear "Angel" - Gavin Friday "Pretty Piece of Flesh" - One-Inch Punch Kissing You (Love Theme from Romeo + Juliet) - Des'ree – "Whatever (I Had a Dream)" - Butthole Surfers Lovefool - ...
February 12, 2012

english
i need to create a eight song soundtrack and how they relate to romeo and juliet play.
February 12, 2012

english
i need to find eight songs so i can put on asound track and how they relate to eight acts it can be any eight acts
February 12, 2012

english
i need to chose at least 8 songs and how they relate to romeo and juliet acts
February 12, 2012

Math
Log8 4 + log16 2 x log 27 81= x solve for x
February 11, 2012

Physics
A 0.13 kg bullet traveling at 614 m/s hits a 5.7 kg block of wood and stays in the wood. What is the velocity (speed)of the wood block immediately after the bullet hits it
February 11, 2012

Chemistry
What volume of 6.00 M nitric acid is needed to prepare 250. mL of 0.750 M nitric acid?
February 9, 2012

Chemistry
What mass of KH2PO4 is needed to prepare 500.0 mL of a 0.067M solution?
February 9, 2012

math
A rectangular lot has an area of 216.795 square meters and a width of 9.7 meters. Nick calculated the length of the lot to be 2.235 meters. Without solving, is Nick's calculation correct?
February 8, 2012

physics
a point charge q2 equals negative 2.1 micro C is fixed at the origin of a coordinate system. another point charge q1 equals 4.1 micro C is initially located at point p a distance d1 equals 6.1 centimeters from the origin along the x axis
February 8, 2012

chemistry
In a coal-fired electric generating plant, the coal is pulverized before being mixed with air in the incinerator. Use the collision theory to explain why the coal is pulverized.
February 8, 2012

algebra
Simplify 1+2/x / 1/x - 2/x^2
February 8, 2012

Math
Can you help me solve this problem? Cuz i cant seem to figure it out. An orbiting satellite traveled 3,225 miles in 40 minutes. Find its speed in miles per hour. (Round your answer to the next whole number.) (a)103 (b)4,838 (c)4,267 (d)6,200 (e)150
February 6, 2012

Finance
What is the present value (or purchase price) of an annuity product which will pay you $2,000 at the end of each year for the next 15 years? Use an interest rate of 9%.
February 6, 2012

Math
A scale model of a house is 1 foot long. The actual house is 50 feet long. In the model, the window is 1 1/5 inches high. How many feet high is the actual window?
February 6, 2012

physics
a 2.5 kg mass is connected to a spring. when a 4N is applied to the spring it compresses 2cm. if the spring is stretched and then the mass is released, what would be the period of the motion.
February 5, 2012

physics
Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of food energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 100 W lightbulb that is lit for 8.4 hours? ...
February 5, 2012

physics
Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of food energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 100 W lightbulb that is lit for 8.4 hours? ...
February 5, 2012

Math
I tried using my calculator and punching in the choices to figure out what x is and none of them equaled -10 so idk what i did wrong Find the value of x that will make the following numerical expression equal to − 10 . -5^2+(x+2)/-4-(-6) (a)−1 (b)−3 (c)2 (d)1...
February 4, 2012

Chemistry
Yea I could have used the help on this question instead of answering a question with a question. I needed to know the set up, clearly I'm not entirely sure. I see you do this on a few posts Dr. Bob
February 4, 2012

Physics
In a game of American football, a quarterback takes the ball from the line of scrimmage and runs backwards for 10 yards, and then sideways to the left, parallel to the line of scrimmage for 15 yards. At this point, he throws a forward pass at the angle of 60 degrees with ...
February 2, 2012

college algebra
an isosceles triangle has at least two sides of equal length. Determine whether the triangle with vertices (0,0), (3,4),(7,1) is isosceles.
February 2, 2012

Physics
A basketball is released from a height of 3m onto a hard surface. What height will the ball rebound to and why ?
February 2, 2012

math
20 mg = 20 x 10^-3 g 90 mcg = 90 x 10^-6 g no. of doses = 20 x 10^-3 / 90 x 10^-6 = 222
February 2, 2012

Physics
Can you please explain how to find time by using step by step.
February 1, 2012

Physics
urprisingly, very few athletes can jump more than 2.2 ft (0.66 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.2 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.
February 1, 2012

math
Gwen was planting tomato plants in a row 6 2/3 yards long. She put the plants 2/3 yard apart. How many plants were in the row?
February 1, 2012

chemistry
if 3.60g of NaCl is dissolved into 75.00mL of water, what is the concentration of this salt solution, in m/v%?
January 31, 2012

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