Friday
August 29, 2014

Posts by Joe


Total # Posts: 2,048

Calculus
A street light is at the top of a 19 foot tall pole. A 6 foot tall woman walks away from the pole with a speed of 7 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 feet from the base of the pole?
April 3, 2012

AP CHEM
When 0.03 moles of lead(II) nitrate are dissolved in enough water to make 266 milliliters of solution, what is the molar concentration of nitrate ions? Answer in units of M I already tried moles per liter and it says it is wrong.
April 1, 2012

Chemistry
Yeah I'm referring to the phase diagram and the Solid/Liquid line
March 29, 2012

Chemistry
I think the negative sign implies that the slope between S and L is negative so as you increase Pressure you will get a small T. But what formula did you use to find delta T.
March 29, 2012

Fantel
The heat of vaporization of water is 40.66 kJ/mol. Assuming sweat is 100% water, how much heat is removed from your body through the evaporation of 3.50 g of sweat?
March 28, 2012

matth
hi if the second term of a sequence is root(2) and the seventh term is 8 what is the nth term equation(Geometric sequence) thanks
March 26, 2012

statistics
Elesha.. I don't understand your answers
March 26, 2012

Math
the volume of a rectangular prism is 256 cubic centimeters. What is the volume of a similar rectangular prism that has edge lengths one fourth as long as the edge lengths of the original prism?
March 26, 2012

science
a 2000 kg sedan is traveling west at 25m/s. How would the sedan's momentum change if it slowed down to 10 m/s?
March 25, 2012

probability/binomial
i'm having trouble with probability and the binomial thm, could i get a good website with problems
March 24, 2012

Math
I think they're all correct
March 19, 2012

alg2trig
1-(1/a)/1-(1/a^2)
March 11, 2012

physics
A 1.1 kg hammer slams down on a nail at 5.0 m/s and bounces back at 1.0 m/s. If the impact lasts 1.0 ms, what average force is exerted on the nail?
March 11, 2012

chemitry
thanks
March 9, 2012

chemitry
I have a list of chemicals, how do i know if they are alkanes and alcohols
March 9, 2012

Math
Transform the equation by completing the square: y^2 + 2x - 6y - 7 = 0
March 8, 2012

calculus
Find a unit vector U such that the rate of change of f in the direction of U at the given point is maximum. point being (3,5,pi) I know hos to do this when given a direction but since im asked to ind the unit vector first it kinda throws me off. do i just use my point? like ...
March 8, 2012

physics
A high-speed sander has a disk 8.00 cm in radius that rotates about its axis at a constant rate of 1100 revolutions per minute. Determine the angular speed of the disk in radians per second.
March 7, 2012

chemistry
what are van der waals forces
March 7, 2012

Chemistry
is this answer correct? these form need to verify is these answers are correct. ty
March 5, 2012

algebra
M times 2/3 equals 1 - 13/15
March 4, 2012

physics
216000000
March 4, 2012

math
12 students wanted to go on a field trip. that was 3/4 of the class. how many students are in the class
March 4, 2012

chemistry
what is the difference between an inhibitor and a catalyst in a chemical process?
March 1, 2012

physics
A science museum has asked you to design a simple pendulum that will make 25.0 complete swings in 85.0 {\rm s}. How long should the pendulum be? in meters
February 29, 2012

physics
FFFFFFFFFFFFUUUUUUUUUUUUUU
February 28, 2012

physics
A 750.0 N man, carrying a 1.9 kg physics textbook, stands at the center of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a ...
February 27, 2012

physics
A 750.0 N man, carrying a 1.9 kg physics textbook, stands at the center of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a ...
February 26, 2012

physics
A car is sitting at the top of an inclined plane, which is 5.2 meters long and meets the horizontal at an angle of 12 degrees. The cart is then allowed to roll to the bottom of the incline. What will be the velocity of the cart at the bottom of the incline. (4.61m/s) Please ...
February 25, 2012

chemistryhelp
for example will AlCl3 conduct less electricity than NaCl
February 24, 2012

chemistryhelp
i also had a question on conductivity, if i have an ionic solution with 2 salts at same mass will the one with least molecular mass conduct more electricity (bc there are more ions)
February 24, 2012

chemistryhelp
but can i use other salts?
February 24, 2012

chemistryhelp
if i made a simple circuit with an NaCl in between is that similar to what the electrolyte in a battery does so does that mean that i can put NaCl in substitute of whatever is currently in the battery
February 24, 2012

chemistryhelp
also I was researching and I was wondering what an ionic current was
February 24, 2012

chemistryhelp
can the electrolyte be a salt (NaCl of KCl)
February 24, 2012

chemistryhelp
so it transfers the electrons (based on what I know)
February 24, 2012

chemistryhelp
what does the electrolyte in batteries do?
February 24, 2012

highschool bio
Cells are specialized in structure to match their function. Compare cell specialization in gametes with other examples of cell specialization.
February 22, 2012

Physics
A child pushes a merry go-round from rest to a final angular speed of 0.78 rev/s with constant angular acceleration. In doing so, the child pushes the merry-go-round 1.6 revolutions. What is the angular acceleration of the merry go-round? v=d/t .78rev/s = 1.6 rev / t t= 1.6 ...
February 21, 2012

physics
A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
February 20, 2012

physics
A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period?, What is the power of the elevator motor during an upward cruise with ...
February 19, 2012

statistics
Suppose that the weights of airline passenger bags are normally distributed with a mean of 48.08 pounds and a standard deviation of 3.13 pounds. A)Let X represent the weight of a randomly selected bag. For what value of c is P(E(X) - c < X < E(X) + c)=0.84? Give your ...
February 19, 2012

physics
On a frozen pond, a 13.2 kg sled is given a kick that imparts to it an initial speed of v0 = 2.48 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.123. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.
February 18, 2012

Math ratios
The ratio of cars to vans in a parking lot was 5 to 2. There were 28 cars and vans in the parking lot. How many cars were in the parking lot? How many vans were in the parking lot?
February 18, 2012

Biology
Sure.
February 17, 2012

physics
A wave traveling in the  + x direction has an amplitude of 0.35 m, a speed of 5.2 m/s, and a frequency of 14 Hz. Determine: 3.1.the wavelength, (2) 3.2.the wave number, (2) 3.3the angular velocity, (2) 3.4. the equation of the wave
February 16, 2012

emergency physics
The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound
February 15, 2012

Math
33.4 because it takes into consideration probability, you have to look at the number and depending on weether it is even or odd you either increase or decrease
February 15, 2012

physics
The rider sees a traffic queue ahead. He applies the brakes and reduces the speed of the motorbike from 18 m/s to 3 m/s. Use the equation in the box to calculate the kinetic energy lost by the motorbike. 1 over 2× mass × speed
February 15, 2012

Math
An airplane leaves the airport and flies due west 170 miles and then 240 miles in the direction 200°30'. Assuming the earth is flat, how far is the plane from the airport at this time( to the nearest mile)?
February 14, 2012

physics
A car travels at a constant speed around a circular track whose radius is 2.60 km. The car goes once around the track in 344 s. What is the magnitude of the centripetal acceleration of the car?
February 13, 2012

networking
In an analog cellular structure, what is needed to establish a valid authentication?
February 13, 2012

Physics
If a total mass of 11.1 kg falls 5.23 m and all of the mechanical energy is converted to internal energy, by how much will the internal energy of the water increase? The acceleration of gravity is 9.81 m/s 2 . Assume no energy is transferred as heat out of the vessel to the ...
February 12, 2012

math word problem
lexi and maria had $250.oo altogether. After lexi spent 2/5 of her money and Maria spent $40.00 they had the same amount of money left.How much money did lexi have in the beginning?
February 12, 2012

Mathematics
OPQRS is a right pyramid whose base is a square of sides 12cm each. Given that the slant height of the pyramid is 15cm. Find the height of the pyramid, the volume of the pyramid, and the total surface area of the pyramid by first drawing the net of the pyramid.
February 11, 2012

Physics
A rocket of mass 4.5 e5 kg is in flight. Its thrust is directed at an angle of 58.5° above the horizontal and has a magnitude of 7.50e6 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.
February 10, 2012

trigonometry
the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65 degree and 40 degree respectively find the two legs. Answer using law of sines pls
February 10, 2012

Mathematics
The mass of Aravin to the mass of Bob is in the ratio 17 : 13. If the difference in their masses is 12 kg, find their combined mass.
February 8, 2012

math
a rope 60m long and 5cm in diameter is coiled tightly. Estimate, correct to one significant figure, the radius of the 'circle' formed. ( please could we have working out).
February 7, 2012

physics
At a time t after being projected from the ground, a projectile is displaced x units horizontally and y units vertically above its point of projection. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What are the horizontal and vertical ...
February 6, 2012

physics
a box slides down a frictionless hill. the spring stops it. when the box stops how much has the spring compressed. the hill is 5m high, the mas of the box is 20 kg, and the spring constant is 350 n/m
February 5, 2012

physics
A person throws a 2.5 lb stone into the air with an initial upward speed of 15 ft/s. Make a free-body diagram for this stone (a) after it is free of the person’s hand and is traveling upward, (b) at its highest point, (c) when it is traveling down ward, and (d) while it ...
February 1, 2012

math
The diagram shows a shape, all the corners are right angles, all the measurements are in cm explain why (x+4) (x +5) - 6 15
January 31, 2012

chemistry
Suppose that 1.78 x 10^3 kg of Fe are obtained from a 5.80 x 10^3 kg sample of Fe2O3. Assuming that the reaction goes to completion, what is the percent purity of Fe2O3 in the original sample?
January 31, 2012

Measurement:: Metric Units
A classroom table is 1 m wide and 1.75 m long. How many 39 cm wide chairs can fit around the table?
January 31, 2012

math
Our big black cat had some kittens, one was white one was black and one was tabby. How many cats lived in our house?
January 30, 2012

chemistry
correct answer is: -5133.3-[(8x-393.5)+9(-241.8)] = 190.9 since it is an enthalpy of formation, the value has to be negative, thus the correct answer is -190.9
January 29, 2012

physics
A 0.25 kg cube of iron is heated and its temperature rises from 23.0 C to 45.0 C. How much heat entered the cube in Joules and in Calories?
January 26, 2012

physics
anyway can you help me solve this problem please
January 19, 2012

physics
yes i did pay but they are not going to help
January 19, 2012

physics
yea i put in masterphyics hw and it said its wrong i did it 3 times this question is driving me crazy
January 19, 2012

physics
A helicopter 7.60m above the ground and descending at 3.90m/s drops a package from rest (relative to the helicopter). We have chosen the positive positive direction to be upward. The package falls freely. part A- Just as it hits the ground, find the velocity of the package ...
January 19, 2012

math
Scott uses three 14 gallon tanks of gas a month. What is the average number of gallons he uses daily in a 30 day month? Give your answer to the nearest half gallon
January 19, 2012

physics help
well i square rooted 164.17 and gave me 12.8128 then i put - 12.8 and it gave me a wrong anwser for my hw problem
January 19, 2012

physics help
i didnt put 7.60m and 3.90m/s in the question problem
January 19, 2012

physics help
for A is it 164.17 b. would be a upward direction
January 19, 2012

physics help
A helicopter 7.60 above the ground and descending at 3.90 drops a package from rest (relative to the helicopter). We have chosen the positive positive direction to be upward. The package falls freely. A)Just as it hits the ground, find the velocity of the package relative to ...
January 19, 2012

Math
x-5 MOST research shows x-5 though i think it is a sentence......not sure about answer so if you think its wrong it probably is wrong
January 17, 2012

Math
Simplify 2x(x+3) Is it suppose to be 2x^2+6 or 2x^2+6x?
January 17, 2012

arithmetic
find the cost of 100grams of rice per 1/2 a kilogram
January 16, 2012

geometry
The graphs y=2x+1 and 2y+x=2 contain 2 sides of a rectangle.if 1 vertex of the rectangle has coordinates (6,3), draw the rectangle.
January 11, 2012

statistics
Mean class scored 74 w/ standard deviation of 4.3. What is range of scores for 68% of class?
January 10, 2012

trigonometry
okay i understand what u r saying...i think LOL we have a right triangle A= right verticle B= bottom horizontal (called the base when i was in school.thousand years back.) and C= adjascent line copleting triangle. A is on left, so we are on the same pagefrom the bottom of A ...
January 7, 2012

trigonometry
plz, forgive me, it has bee a while since i have worked with angle and terminology. i meant having a right angle triangle (the bottom or lowest horizontal line being the BASE line , the 90 degree line being the right angle. say the horizontal line is .5 inches the right angle ...
January 7, 2012

trigonometry
what is th decimal equiavalent of three degrees of a 90 degree angle with a .1666 long base
January 7, 2012

physics
An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.82 × 10-46 kg·m2. From these data, estimate the effective ...
January 2, 2012

physics
A wheel of diameter 28.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. A force = (-38.0 + 39.0 ) N acts at a point on the edge of the wheel that lies exactly on the x axis at a particular instant. What is the torque about the ...
January 2, 2012

Math grade 12
10b-b+1
January 1, 2012

math
72 tires are changed between a small and large truck over 8 weeks. The large truck has 3 times as many tires as the small truck. How many tires does the small truck have?
December 21, 2011

Pre-Cal
find the value of the function k(p/q)
December 16, 2011

Electric Power Tools
I need help with my test, I don't know if they are all right or not. I answered the questions to the best of my ability. My answers are marked with an *. 1. What is the typical no-load speed of a high-speed drill? A. 1,000 rpm *B. 2,500 rpm C. 3,000 rpm D. 3,500 rpm 2. Why...
December 15, 2011

English
Do I need a comma in this sentence or can it be improved on? This dream signifies Gabriel’s hope for Roy to follow in his footsteps and become a religious figure like him.
December 15, 2011

statistics
If 20% of the people in a community use the emergency room at a hospital in one year, find the probabilities for a sample of 10 people, a.At the most three use the emergency room. b.Exactly three use the emergency room c.At least five use the emergency room.
December 13, 2011

english
Should i use the word by, of, as..in this sentence? John doesn’t know who or what to believe, for he has never experienced the cruelties by white people, like his father had.
December 13, 2011

english
Is this properly written? Ichiro Yamada, a no-no boy, struggles with an identity crisis as he returns home to Seattle after World War II.
December 12, 2011

literature
Full Powers
December 12, 2011

literature
"The poem of the Full Powers by Pablo Neruda" I need to know what is the poem about? I already read this poem but i dont really understand it :(
December 12, 2011

literature
I need to now what is the poem of full powers about... the poem is by pablo neruda translated by Ben Belitt and Alastair Reid I already read this poem but i dont really understand it. So please help me ASAP Thanks
December 12, 2011

english
K do I need a comma after times then? and if not could the sentence be improved?
December 12, 2011

english
Does the word times need an apostrophe after the e? Often time’s harmful words were accompanied by acts of violence towards Jews as well.
December 12, 2011

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