Monday
December 22, 2014

Posts by john


Total # Posts: 6,393

science urgent need help
What is the independent variable? Select one option from the list below. 1 is the correct answer help me please .thanks Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient ...
December 11, 2013

Science need help
What is the independent variable? 1 is that the correct answer help plz Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the ...
December 11, 2013

science help plzzzzzzzzzzzzzzz?
but its different then the other this one independent variable
December 11, 2013

science help plzzzzzzzzzzzzzzz?
Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...
December 11, 2013

Science need help
Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...
December 10, 2013

Math- urgent
2x = 28 x = 14
December 10, 2013

calculus
the tangent line to the curve y=x^2 at the point (a,a^2) passes through the point (2,1) find all possible values of a. Thank you so much!!
December 9, 2013

science
Thank you!!!
December 9, 2013

science
How is biodiversity related to human activities that use natural resources? A.biodiversity decreases as humans use natural resources wisely B.biodiversity decreases as humans limit there use of natural resources C.biodiversity increases as humans deplete natural resources D....
December 9, 2013

science
answers are all wrong the right ones are these: A.there will be fewer renewable resources B.more humans will populate the earth C.biodiversity naturally reduces over time D.more humans will recycle materials
December 9, 2013

science
which one help!!
December 9, 2013

science
which of the following will make it harder in the future to develop sustainable methods for humans using resources? A.biodiversity decreases as humans use natural resources wisely B.biodiversity decreases as humans limit there use of natural resources C.biodiversity increases ...
December 9, 2013

science
Is D right?
December 9, 2013

science
Ok thanks!!
December 9, 2013

science
Complete the following sentence with the best phrase below. Removing just one species from an ecosystem: A.would have no effect, because it is just one species of many B.would have little effect, unless it was a keystone species C.would have a negative effect, unless it was an...
December 9, 2013

science
I did! I am confused! Help! Please!
December 9, 2013

science
I dont know the answer help!
December 9, 2013

science
D?
December 9, 2013

science
Which of the following could help reduce loss of biodiversity? A. increasing construction of tall buildings B. increasing farming operations C. increasing conservation measures. D. increasing the human ecological footprint
December 9, 2013

science
I think it is C. Am I correct?
December 9, 2013

science
Help!
December 9, 2013

science
Which one?
December 9, 2013

science
which of the following pairs of terms could be used to describe a bullfrog that is active at night and enters a state of complete inactivity during cold months? A. cooperation and hibernation B. aggression and circadian rhythm C.circadian rhythm and hibernation D. courtship ...
December 9, 2013

STATISTICS HELP
A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...
December 9, 2013

Advanced Functions/Precalculus
1. The expression sinπ is equal to 0, while the expression 1/cscπ is undefined. Why is sinø=1/cscø still an identity? 2. Prove cos(ø + π/2)= - sin ø
December 6, 2013

science
can you provide the choices ????
December 6, 2013

Chemistry
An aqueous solution containing 17.1 g of an unknown molecular compound ( nonelectrolyte) in 105.0g of water was found to have a freezing point of -1.8 degrees Celsius. What is the molar mass of the unknown compound?
December 6, 2013

Advanced Functions/Precalculus
Trigonometry Questions 1. Using a compound angle formula, demonstrate that sin2π/3 is equivalent to sin π/3 2. The expression sinπ is equal to zero, while the expression 1/cscπ is undefined. Why is the identity sin(theta)=1/csc(theta) still an identity? 3. ...
December 5, 2013

first year chem
There are two naturally occurring isotopes of chlorine with ratios of 76% and 24%. One mole of PCl3 is made using a sample of isotopically pure chlorine gas (containing only one of the two isotopes). The product weighs 142 g. If chlorine gas containing the other isotope were ...
December 5, 2013

Advanced Functions/Precalculus
Trigonometry Questions 1. Using a compound angle formula, demonstrate that sin2π/3 is equivalent to sin π/3 2. The expression sinπ is equal to zero, while the expression 1/cscπ is undefined. Why is the identity sin(theta)=1/csc(theta) still an identity? 3. ...
December 5, 2013

Advanced Functions/Precalculus
thanks! i forgot to include the exponent. I re-typed them here: 2. Solve the equation 7sin^2x-4sin2x/cosx=-1 where 0≤x≤2π 3. Determine the exact value of cos2(theta) when tan(theta)=3/4 and π<theta<3π/2 4. The average number of customers, c, at...
December 4, 2013

Advanced Functions/Precalculus
Trigonometry Questions 1. Solve the equation sin2x+1=-2sinx for 0≤x≤2π 2. Solve the equation 7sin2x-4sin2x/cosx=-1 where 0≤x≤2π 3. Determine the exact value of cos2(theta) when tan(theta)=3/4 and π<theta<3π/2 4. The average ...
December 4, 2013

Advanced Functions/Precalculus
Trigonometry Questions 1.) Find the exaqct value of tan(11π/12) 2.) A linear trig equation involving cosx has a solution of π/6. Name three other possible solutions 3) Solve 10cosx=-7 where 0≤x≤2π
December 4, 2013

Geometry
How is the size of a TV measured? If we are comparing a 15-inch TV and a 30-inch TV, what is twice as big about the bigger TV?
December 4, 2013

math
Mrs. Smith had 1/2 of a pumpkin pie left over. She split the leftover pie evenly between her 3 children. What fraction of pie did each child get?
December 3, 2013

Geometry
To determine the relationship between miles and kilometers, if we use the conversion 39.37 inches= 1 meter, we find that 1 kilometer is approximately equal to 0.62 mile. What if we use the conversion 2.54 centimeters = 1 inch? How far apart are the answers (1 kilometer = x ...
December 3, 2013

physics
A child and sled with a combined mass of 53.0 kg slide down a frictionless hill that is 7.63 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
December 2, 2013

AP Physics
A 67.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 4.7 m below the water's surface, what is the total distance between the diving board and the diver's ...
December 2, 2013

AP Physics
A 67.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 4.7 m below the water's surface, what is the total distance between the diving board and the diver's ...
December 2, 2013

Physics Classical Mechanics
anyone solved this ?????
November 27, 2013

Algebra
For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?
November 26, 2013

physics
A monatomic ideal gas is thermally insulated, so no heat can flow between it and its surroundings. Is it possible for the temperature of the gas to rise? If the temperature can rise, how does it rise?
November 25, 2013

math
For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?
November 25, 2013

communicate
consider an artifact that is prominently displayed by a friend or co-worker - either at home or in some other space. In 1-2 paragraphs, explain how this artifact has influenced your interpretation of this person's identity. Is your perception more positive or negative ...
November 25, 2013

Calculus
An observer stands at a point P, one unit away from a track. Two runners start at the point S in the figure and run along the track. One runner runs 2 times as fast as the other. Find the maximum value of the observer's angle of sight è between the runners. Thank ...
November 23, 2013

Solar Energy
Formula in first question: a)Pmpp < Voc X Isc Formula in second question: Load resistance = Vmpp/Impp
November 23, 2013

Solar Energy
With respect to a PV module's I-V and P-V curves, and the module's operating point, consider the following statements: a) When the operating point of the PV module is on the MPP (maximum power point), \(P_{mpp} \lt V_{oc} \times I_{sc} \) b) For a given Irradiance and ...
November 23, 2013

Math
Thanks Ms. Sue!
November 19, 2013

Math
What is the smallest positive composite integer?
November 19, 2013

Comm 215
Do these look correct? Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. _X_True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a good pitcher most of all. _X_True __False 3. The following ...
November 19, 2013

math
how can you use the product of 12 x 6 to find the product of 12 x 12 ?
November 18, 2013

chemistry
A mixture of NaCN and NaHSO4 consists of a total of 0.60 mol. when the mixture is dissolved in 1.0 L of water and comes to equilibrium the pH is found to be 9.9. Find the amount of NaCN in the mixture.
November 18, 2013

math
Find recursive and explicit formula for -40 -36 -32 -28
November 18, 2013

Liquid capacity of pitcher
1 quart
November 17, 2013

Science
A pelican flying along a horizontal path drops a fish from a height of 125 m while traveling 40 m/s. How far does the fish travel horizontally before it hits the water below?
November 17, 2013

Statistics
this makes no sense, u said which would be inferential and which would be inferential
November 16, 2013

science
Chemistry Hey guys, i have a question about how to figure out how much mass of a compound i need to find 130ppm here is the question. What mass of Fe(NH4)2(SO4)2*6H2O is required to prepare 2.25 L of a 130 ppm iron solution? Now i know that ppm is (mg of desired compound)/(kg ...
November 16, 2013

Chemistry ppm
Oh okay, I understand. Wow thanks alot.
November 16, 2013

Chemistry ppm
Hey guys, i have a question about how to figure out how much mass of a compound i need to find 130ppm here is the question. What mass of Fe(NH4)2(SO4)2*6H2O is required to prepare 2.25 L of a 130 ppm iron solution? Now i know that ppm is (mg of desired compoun)/(kg of solvent ...
November 16, 2013

chemistry
OH is correct haha sorry i read that wrong um well C is incorrect same as D, B is incorrect because if the constituent is the first number than you wouldnt use the number 1 plus its a methyl as the first carbon making it decane and then A is the only correct one for reasons ...
November 16, 2013

chemistry
4,5-dimethylpentane is incorrect, not only is it not using the lowest constituents numbers in the name I.E. using 1,2 instead of 4,5 it is impossible to have a methyl constituent on the first or last carbon because that would just mean the compound is not a pentane but in fact...
November 16, 2013

Math
Well W = 3 L = (2W)-5 = (6) - 5 = 1 so W + W + L + L = perimeter so 2W + 2L = perimeter so subbing 2W-5 in for L we get 2W + 2(2W-5) = perimeter = 2W + 4W-10 = perimeter = 6W - 10 = perimeter = 6(3) - 10 = perimeter =18 - 10 = perimeter = 8 = perimeter or solving the other way...
November 16, 2013

Chemistry
i dnt see any relevant equations, i dont know how u expect someone to help you also is strain a spring constant? too much information is lacking
November 16, 2013

physics
A 160 kg child jumps at 7 m/s into a boat floating a rest. After the jump, they both move at 3 m/s forward. Find the boat's mass.
November 14, 2013

phyics
A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.60 x 105 Pa. Assuming that the top and bottom surfaces of the cap each have an area of 3.60 x 10-4 m2, obtain the magnitude of the force that the screw thread ...
November 12, 2013

phyics
18m
November 12, 2013

English
also mood coward
November 9, 2013

English
is sarcasm one
November 9, 2013

English
which poetic device does this quote use “Why no one on our side had even thought of firing a gun, because when you came right down to it, we didn’t like guns and did not believe in them”
November 9, 2013

First year chem
It was on a test and computer wasn't allowed.
November 9, 2013

First year chem
Barium has 6 stable isotops (132Ba, 134Ba, 135Ba, 136Ba, 137Ba, and 138Ba) with natural abundances ranging from 0.1% for least abundant to 71.7% for the most abundant. Which isotope of barium is the most abundant? (Answer is 138Ba) Thank you for your help!!
November 9, 2013

PRE-CALC HELP
1) Two boats leave the same port at the same time. One travels at a speed of 27 mi/h in the direction N 50° E and the other travels at a speed of 22 mi/h in a direction S 70° E (see the figure). How far apart are the two boats after one hour? (Round your answer to the ...
November 8, 2013

PRE-CALC HELP
Two boats leave the same port at the same time. One travels at a speed of 31 mi/h in the direction N 50° E and the other travels at a speed of 20 mi/h in a direction S 70° E (see the figure). How far apart are the two boats after one hour? (Round your answer to the ...
November 8, 2013

PRE-CALC HELP
A communications tower is located at the top of a steep hill, as shown. The angle of inclination of the hill is 58°. A guy wire is to be attached to the top of the tower and to the ground, 150 m downhill from the base of the tower. The angle α in the figure is ...
November 8, 2013

physics
Water is flowing down through the pipe shown in the drawing. Point A is 0.410 m higher than B. The speed of the water at A and B are vA = 5.00 m/s and vB = 3.80 m/s. Determine the difference PB - PA in pressures between B and A. The density of water is 1.00x10^3 kg/m3.
November 7, 2013

geography
What are some reasons why society, especially in the U.S., has been more and more accepting of the view of global warming? Please post to these questions by the end of Week 3.
November 6, 2013

chemistry
Assuming reaction goes to completion, determine the final concentration of NH4Cl in the calorimeter. heat capacity =3.03J/g.c density =1.012 5g of NH4Cl used 100 mL of water used NH4Cl(s) + H2O(l) --> NH4Cl(aq)
November 6, 2013

math
HOw can i explain this to a 4th grade student as it seems her teacher did not do the number substitution like W and dividing to get the answer.
November 5, 2013

math
the girls high school basketball team played 12 games. they won 6 more games than they lost. find the number of games the basketball team won.
November 5, 2013

ashford
Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed the test than students ...
November 4, 2013

Algebra
-2 |h-7|= -28
November 3, 2013

chemistry
Compared to the particles of a gas, the particles of a liquid are not in constant motion collide with the sides of the container, but not with each other do not completely fill their container can move longer distances have more space in between the molecules
November 2, 2013

Physics
MASS PUSHED BY A SPRING A block of mass m=2 kg on a horizontal surface is connected to a spring connected to a wall (see figure). The spring has a spring constant k= 16 N/m. The static friction coefficient between the block and the surface is μs= 0.7 , and the kinetic ...
November 2, 2013

math
A small wheel of radius r is situated at the top of a ramp having an angle θ = π/3 rad At t = 0 the wheel is at rest and then it starts to rotate clockwise in the positive x direction with constant angular velocity ω. Find the parametric ...
October 31, 2013

informal logic
Which of the following may not qualify as a falsifiable claim? (Points : 1) Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease.
October 30, 2013

Algebra
a car repair shop charge $80 per hour for labor and $210 for the parts of a car . if the total cost of repair for the car was $490 , how many hours did it take ro repair the car ?
October 28, 2013

Probability
7. The random variable X is distributed normally with a mean of 12.46 and variance of 13.11. You collect a random sample of size 37. a. What is the probability that your sample mean is between 12 and 13? b. What is the probability that a single observation is between 12 and 13...
October 27, 2013

chemistry
Based on the calculations above, which of the following equations is the one represented by this experiment? Justify your answer by comparing the moles of iron consumed and the moles of copper produced to the coefficients in the equation of your choice. (16 points) Fe + CuCl2...
October 26, 2013

Social studies
"There capitols"? Really? You're a teacher? How about "their capitols"? And your map left off the capitol of Mississippi altogether.
October 24, 2013

physics
A person jumps from the roof of a house 4.0-m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.66m. If the mass of his torso (excluding legs) is 42kg , what is the magnitude of the average force exerted ...
October 24, 2013

Physics
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 22◦ below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration ...
October 23, 2013

physics
A place kicker must kick a football from a point 34.0 m (about 37 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 21.0 m/s at an angle of 56◦ to the horizontal. To...
October 23, 2013

Math- URGENT
find the value of x or y so that the line through the points has the given slope. (12,y) and (15,-8); slope: 2/3
October 23, 2013

Chemistry
Is a more negative corrosion potential more susceptible to corrosion or a less negative corrosion potential?
October 23, 2013

science
What keeps the very dense gas at the core of the Sun from becoming a solid?
October 23, 2013

English ---- check grammar---
I know that looks like a long paragraph . I wrote it like a essay , but when i post it , it changed all my style and space !!! I dont know why !
October 23, 2013

English ---- check grammar---
Can you guys check grammar for me ? Thank you!
October 23, 2013

English ---- check grammar---
When I was fifteen years old, I left the Vietnam to begin a new life with my family in the United States. But my young heart has never stopped yearning for that one day when I would go back home. One peculiar thing about Vietnamese is that they associate homesickness with ...
October 23, 2013

5TH GRADE MATH
50*2 = 100 100/3 = 33 1/3
October 22, 2013

5TH GRADE MATH
Um...Stephon could you stop typing in caps?
October 22, 2013

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