Thursday
November 27, 2014

Posts by tom


Total # Posts: 1,112

science
What are the orgin names for these abbreviation? in latin Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-tron
January 17, 2013

Physics
I should indeed have formulated this a lot clearer. I have done an experiment in which I add a stationary point to the standard pendulum situation, which creates a period function dependent on both the length of the pendulum as on the height of the stationary point which ...
January 7, 2013

Physics
Hello everyone, I have made measurements of the periods of a pendulum attached to a stationary point at a certain height h. When plotting the periods as a function of the square root of the length minus the height it gives us a straight line. I now need to prove that this line...
January 7, 2013

Chemistry
How many joules ar required to heat a frozen can of juice (360 grams) from -5 degrees C (the temp of an overcooled refrigerator) to 110 degrees C (the highest practical temp within a microwave oven)?
January 5, 2013

math
A video rental store has 1,234 videos on the shelves. OF the videos 1/3 were rated PG and 1/2 were rated PG-13. What equation can be used to find v, the total number of PG and PG 13 videos in the store?
December 29, 2012

math
if A [] B = A^B-(A+B), 7 [] 9 = ?
December 25, 2012

maths
Express sin 2x cos 4x as a sum of trigonometric functions
December 24, 2012

maths stats
For each day of the 5-day working week Tom can choose any one of 6 newspapers to read at the lunchtime. (i) How many different choices are possible in a week? (ii) If Tom wants to read a different title each day, then how many different choices are possible in a week?
December 23, 2012

Physics
Amy age 8 27kg 127cm Bruce age 12 41kg 149cm Both Amy and Bruce are learning gymnastics and having trouble being able to get enough height and time in the air to do a back somersault without the coach spotting them. The coach gives them homework to just focus on jumping ...
December 15, 2012

math problem
To make an orange dye, 4 parts of red dye are mixed with 3 parts of yellow dye. To make a green dye, 2 parts of blue dye are mixed with 1 part of yellow dye. If equal amounts of green dye and orange dye are mixed,___________ of this mixture is composed of yellow dye.
December 13, 2012

math
According to the statistics of a famous high school in Canada, all their graduates went to either A or B for university study. Following are the proportions of graduates who went to the two universities. University Proportion A 1-k B k Suppose k = 0.4 (a) What is the standard ...
December 9, 2012

Alegbra 1
Mr. Jones got his car washed at super clean. The wash started at 1:55pm and ended at 2:05pm. It cost $7. Mr. Smith got his car washed at Super Clean for $12. the wash started at 9:30am and ended at 9:50 am. Write an equation for the line that represents this situation. Part 2...
December 5, 2012

programming
There are several types of room in a hotel. The HotelRoom Class of Previous Programming Problem was not specific regarding the type of room. Assume that a hotel has guest rooms and meeting rooms. Modify the HotelRoom class as follows: remove the capacity and status instance ...
November 30, 2012

Physics
A 2.50 kg wheel has a diameter of 20.0 cm and is rotating at 3600 rpm. A force acts on it causing it to come to a rest in 10.0 seconds. What is the magnitude of the force?
November 26, 2012

Chemistry
No problem :)
November 24, 2012

Chemistry
For the online course, 1)b and 2)c
November 24, 2012

eng
is the sentence: "By using a statement that began with 'I,' Ramon was able to state his feelings clearly." a simple sentence or a complex sentence?
November 20, 2012

Physics HELP!
The position of an object connected to a spring varies with time according to the expression x = (7.1 cm) sin (2.1π t). Find (a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that the object reaches ...
November 19, 2012

math
a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number
November 14, 2012

math
a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number
November 14, 2012

Physics
The boom of a crane is 20 m long and is inclined 20ᵒ from the horizontal. A bucket of cement with a mass of 3000 kg is suspended from the upper end of the boom. What is the torque acting on the point where the boom is attached to the crane? A. 5.5 x 105 Nm. B. 3.5 x 105 ...
November 13, 2012

psychometric test
Hi i have been given an experiment paper on personality, in this we have to come up with an updated version of Eysencks (EPI) questionnaire. This is to measure extroversion only ,we are measuring concurrent validity. Im having difficult in answering the co varibles which is my...
November 13, 2012

Algebra
help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323
November 9, 2012

chemistry
ryeng i suppose? this is a very easy question 392.4*10-10= x cm xcm^3= ycm^3 ycm^3* 21.09= mass in grams since face centered unit cell has 4 atoms mass/4, then use the product of that to divide by 1.66*10^-24 = amu your result should be 191.84 amu
November 8, 2012

Chemistry
How do I change 3,3,4,4,5,5-hexamethyl-1-hexyne into it's molecular formula
November 8, 2012

physics
the coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. if a 150 kg stone statue is pushed with just enough force to start moving across a wooden floor and the same force continues to act afterward. find the statue’s acceleration.
November 7, 2012

Calc 2
Use Taylor’s Estimate to bound the error of the n-th order Maclaurin approximation of sin(a), where a 2 [��; ].
November 3, 2012

home economics
a firm produces 20 units of output at a market price of #5, a marginal cost of $5, and an average cost of $3. what is the firms economic profit and is the firm maiximizing its economic profit. Is the formula market price-average cost x quantity 20?
November 2, 2012

physics
For a glass lens submerged in water (n=1.33), the critical angle of incidence at which total internal reflection begins to happen is 60.1 degrees. What is the index of refraction of the glass?
November 2, 2012

physics
A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?
October 30, 2012

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
October 30, 2012

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
October 29, 2012

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
October 29, 2012

Physics- Elena please help!!!!
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
October 29, 2012

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
October 29, 2012

Math
If 7x + 5 = -2, find the value of 8x.
October 25, 2012

Math
If 7x + 5 = -2, find the value of 8x.
October 25, 2012

eco365
You should be ashamed of yourselve
October 24, 2012

Algebra 1
Say x is the number of boxes sold in week 1, then: Boxes in week 1: x Boxes in week 2: x + 5 Boxes in week 3: 2x + 10 Total boxes = 4x + 15 4x + 15 = 431 x = 104 So in week 1 there was sold x = 104 in week 2: x + 5 = 109 in week 3: 2x + 10 = 218
October 24, 2012

Algebra 1
integer 1 = a integer 2 = b b-a = 1 (b is one more than a) b-7 = 2*a (b is seven more than two times a) a = b-1 b-7 = 2*(b-1) b-7 = 2b-2 b = -5 so a should be -6 answer is C)
October 24, 2012

Physical Science
630J
October 22, 2012

Chemistry
Dear sir, madam, I am having a little problem with the solution my chemistry book gives on the following problem: We have a person whose body vitamine C concentration decays according to the following formula: 1500*0,974^t. Question A is no problem, but then question B: "...
October 17, 2012

Math
angle ABC ~= angle ACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mangle CBD = 1/2 mangle BAC
October 14, 2012

Math
ÚABC ~= ÚACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mÚCBD = 1/2 mÚBAC
October 14, 2012

PHY 101
A 0.425-kg blue bead slides on a frictionless, curved wire, starting from rest at point where h = 1.50 m. At point , the blue bead collides elastically with a 0.675-kg green bead at rest. Find the maximum height the green bead rises as it moves up the wire. PLEASE HELP I HAVE...
October 6, 2012

science
What happens when you burn magnesium metal using the big idea of energy?
October 6, 2012

math
If μ = 500 and σ =10, z = -3.0 falls how many points below the mean?
October 2, 2012

baking
I dont have any choices that why i cant find it.
September 25, 2012

baking
when making french doughnuts the paste is piped into rings onto _____ _____ and is then lowered into the fat.
September 25, 2012

Physics
Vector , which is directed along an x axis, is to be added to vector , which has a magnitude of 5.0 m. The sum is a third vector that is directed along the y axis, with a magnitude that is 5.5 times that of . What is the magnitude of ?
September 17, 2012

AP Physics
A monkey is hanging from a branch located exactly 24 meters along the ground from the hunter. The monkey is 14 meters above the ground. The hunter aims directly at the monkey and fires a water balloon at the monkey just as the monkey releases his grip. The balloon has an ...
September 15, 2012

physics
A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.58 s after leaving the dock has a magnitude of 7.1 m. What is the car's speed at the instant it drives off the edge of the dock?
September 15, 2012

physics
Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height of the...
September 15, 2012

Math
1/2x+1/2=y
September 13, 2012

physics
A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of ...
September 8, 2012

Math
Find the pattern and fill in the blank. 94 26 ___ 14 10
August 27, 2012

Spanish
Will you please check my grammar? Thanks! In a one-page, typed essay, describe what you would do if you were the governor of your state (or mayor of your city). Include what you would do regarding three separate issues of importance in your state (or town). Si yo fuera el ...
August 19, 2012

Math/physics
Known factors-weight 105 g---speed at start 60 mph---distance traveled 70 yds. Questions ,what is the rate of decelleration?, At what yard marker does it decellate to 35 mph For each 5 feet higher from start - how much farther does it travel. Thank you for your help, Tom
July 28, 2012

physics
the problem stated that the rod has expanded 1/4 its volume. I am looking for the heat supplied that has made its volume expand. please help :D
July 3, 2012

physics
How much heat is needed to be supplied to a 3.5 kg cylindrical rod if its volume changes by 1/4 of its original size? Assume that it is initially at 20K and that c = 2 cal/g.C and α = 8x10^2/C
July 3, 2012

physics
A 4.7 g bullet is fired horizontally into a 0.50 kg block of wood resting on a frictionless table. The block, which is attached to a horizontal spring, retains the bullet and moves forward, compressing the spring. The block-spring system goes into SHM with a frequency of 8.0 ...
June 28, 2012

Physics
What is the maximum theoretical efficiency of a steam engine operating between 60°C and 410°C?
June 27, 2012

Calculus
y=cos3x(sin^3)x
June 17, 2012

Calculus
derivative of y=tan^3(x)
June 17, 2012

Calculus
evaluate the limit: lim cos(x + pi/2)/x x->0
June 17, 2012

Calculus
Find the vector and scalar equations of the plane containing the line r=(3,5,1)+t(-2,3,1) and the point (1,2,3)
June 16, 2012

Physics
so 0.398/1.26 × 10^–6 m2=3.16x10^-7Pa
June 5, 2012

Physics
In a classroom demonstration, a 79.2-kg physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is ...
June 5, 2012

chem
If the density of copper is 8.92 g/ml what is the % error?
May 30, 2012

math
The exchange rate of U.S. dollars to British pound's is .63 you have $4000 to convert to British pounds. How many British pounds will you receive?
May 27, 2012

MATH HELP
A committee of 5 people is to be selected from student council. Council has 6 boys and 7 girls. What is the probability that the committee will have at least 3 boys? *** If you can show work that would be helpful (OPTIONAL)*** THANK YOU VERY MUCH!
May 24, 2012

MATH
A committee of 5 people is to be selected from student council. Council has 6 boys and 7 girls. What is the probability that the committee will have at least 3 boys? *** If you can show work that would be helpful (OPTIONAL)*** THANK YOU VERY MUCH!
May 24, 2012

Physics(work and energy)
but if i do that,then does it mean that i only supply 49000J to only overcome the work done agaist friction?
May 20, 2012

Physics(work and energy)
A cannon ball is fired so that it hits the wall at the top of a 10m tower.If the energy needed to destroy the wall is 49000 F and the mass of the cannon ball is 10 k, the minimum initial velocity of the cannon ball required to break the tower wall is A 100 m/s b 200 m/s c 300 ...
May 20, 2012

physics
A cat walks along a uniform plank that is 4 m long and has a mass of 7 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.5 m from its right end. When the cat reaches the right end, the plank just begins to tip. What is the ...
May 20, 2012

physics
A trained dolphin leaps from the water with an initial speed of 12 m/s. It jumps directly towards a ball held by the trainer a horizontal distance of 5.50 m away and a vertical distance of 4.10 m above the water. In the absence of gravity the dolphin would move in a straight ...
May 20, 2012

Business Finance
Lisa Kane borrowed $8000 on an 8% 60 day note. After 15 days, Lisa paid $2000 on the note. On day 45, Lisa paid $1000 on the note. What is the total interest and ending balance due by the U.S. rule? Use ordinary interest.
May 19, 2012

Chemistry
The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most negative oxidation number is -1. Write the electron configuration of chlorine and explain why these are limiting oxidation numbers for chlorine.
May 13, 2012

Algebra
The body mass index I can be used to determine an individuals risk for heart disease. An index less than 25 indicates low risk. the formula for body mass index is I=700w/H^. W=weight and H=height, Jeromine is 67 inches tall. What weights will keep his body mass index between ...
May 11, 2012

math
3/8 = .375 3/8<1 1% = .01 3/8%= .00375 .00375*$800= $3
May 7, 2012

math
13000/20000=(1-0.04t) (13000/20000)-1=-0.04t [(13000/20000)-1]/-0.04=t t=8.75
May 7, 2012

physics
Thanks Elena
May 7, 2012

physics
An electron enters a region where there is a magnetic field with a strength of 0.5 T which points out of the page (electron has an initial speed of 150 m/sec and is moving to the left). Describe motion of charge in an magnetic field (In particular, what is the shape of the ...
May 7, 2012

English
What are the parts for the sentence "How many players are on a team?"
April 30, 2012

Stats
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6, 3.8, 4.0, and 3.9. What ...
April 29, 2012

Calculus 2 correction
I just wanted to see if my answer if correct the integral is: ∫(7x^3 + 2x - 3) / (x^2 + 2) when I do a polynomial division I get: ∫ 7x ((-12x - 3)/(x^2 + 2)) dx so then I use u = x^2 + 2 du = 2x dx 1/2 du = x dx = ∫7x - 12/2∫du/u - 3/1∫1/u = (7x^2...
April 27, 2012

Math
A bag of 12 white marbles and 1/3 red marbles and 2/5 blue marbles what is the total marbles in the bag?
April 20, 2012

Algebra 2
Abelardo wants to create several different 7-character screen names. He wants to use arrangements of the first 3 letters of his first name(abe, followed by arrangements of 4 digits in 1984, the year of his birth. How many different screen names can he create in this way? A.72 ...
April 16, 2012

Physics
the wind blows with a force of 425N north on a sail boat, while the water exerts a force of 325N west on the sailboat. Find the magnitude and direction of the net external force on the sailboat.
April 9, 2012

equation
4x + 3(29-x) = 100 please show work
April 3, 2012

Trig.
0 greater or equal to t greater or equal to 1.6
April 1, 2012

physics
A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 3.5 cm tall. (a) What type of mirror should be used? concave mirror convex mirror (b) Where is the image located? (Your answer should be positive ...
March 25, 2012

science
If the greatest potential energy is 100J will the kinetic energy of the object ever reach 100J?
March 20, 2012

chemistry
If you have 4.90 moles of Ba, how many liters of N2 would you have at STP?
March 17, 2012

physics
Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in the figure below. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is &#956;k = 0.28. Determine the ...
March 15, 2012

math - calculus
The above answer is incorrect.. everything is right except v=9pi(h) differentiate both sides. gives you... dv/dt=9pi dh/dt 9/9pi= dh/dt. dh/dt= 1/pi
March 12, 2012

chemistry
The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for titration The ...
March 12, 2012

math
I think I got it....11 weeks
March 11, 2012

math
Thanks for your help but I still don't get it
March 11, 2012

math
john has a 25 gallon fish tank. John filled his fish tank today with 24 gallons of water. the water evaporates at a rate of 1.5 gallons per week week. John adds 2 gallons to the tank every other week. At which of the following times will the tank contain 17.5 gallons? a. ...
March 11, 2012

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