Sunday
November 23, 2014

Posts by helpme


Total # Posts: 32

trigonometry
Two pulleys have radii 20cm and 6cm,respectively. The smaller pulley rotates 15 times in 12 seconds. Find the angular speed of each pulley in rad/sec
July 26, 2014

business math
2/10, n/30 find the complement and net amount paid
February 6, 2013

Physics
And where did you get 64.9? Is that the velocity or what?
June 20, 2012

Physics
what will i divide by 1/3? And why should I divide it by 1/3?
June 20, 2012

Physics
Could you pleas explain it further? Thanks ;)
June 20, 2012

Physics
A car travels 12 km West, 18 km South. What is the total car displacement? The car takes 10 minutes to travel from each initial position to final position. What is the average speed and velocity?
June 20, 2012

Physics
Thank You!!
June 19, 2012

Physics
An ant crawls on a tabletop. It moves 2cm East, turns 3cm 40(degrees) North of East and finally moves 2.5cm North. What is the ants total displacement?
June 19, 2012

business Maths
2/10, n/30 $1125 find complement and net amount paid
April 23, 2012

statistics
the life of electric bulbs has a normal distribution with a mean of 35 months and a standard deviation of 4 months. What should the warranty period be if the company that manufactures these bulbs does not want to replace more than 2% of the bulbs?
December 19, 2011

Chemistry
This is very helpful. I'm sure this will be reviewed in upcoming classes and understanding this information will help me be a bit ahead of the game. Thank you very much for your help, I'm sure it wasn't an easy feast to type all this information down. Very ...
October 16, 2011

Chemistry
Hi Im reposting incase my original post doesn't get read. Please see bottom for additional info that I need help getting verified. Many thanks Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a ...
October 16, 2011

Chemistry
Here is wht I did if you can please tell me where I went wrong would be appreciated. resulting compound phosphorous oxide mass = 1.145g # of moles of Phosphorus = 0.500g/30.97g/mol = 0.0161446mol # of grams of combined phosphorus oxide = 1.145g-0.500g (P) = 0.645g of oxygen #...
October 15, 2011

Chemistry
Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a product that has a mass of 1.145 g. What is the empirical formula of the resulting compound? By the use of a mass spectrometer the molecular mass of...
October 15, 2011

Physics
A ball on the end of a string is revolved at a uniform rate in a vertical circle of radius 72.0 cm, as shown in Fig. 5–33. If its speed is .4 00 m s and its mass is 0.300 kg, calculate the tension in the string when the ball is (a) at the top of its path, and (b) at the ...
February 6, 2011

physics
What is the instantaneous velocity of a freely falling object 28 s after it is released from a position of rest? The acceleration of gravity is 9.8 m/s2 . 2)What is its average velocity during this 28 s interval? 3) How far will it fall during this time?
November 12, 2010

Chem
What is the answer?
February 15, 2010

Chem
Do you have to divide again by 760?
February 15, 2010

science
The fact that marble,chalk and limestone all contain calcium carbonate is a problem. Explain why and give examples.
December 14, 2008

math
Mrs. Brighton invested $30,000 and received a total of $2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate?
November 30, 2008

math
Solve the following system of equations. x+y=13 22x+36y=356
November 30, 2008

math
sorry im real bad at probability. a single die is rolled. find the probabilities: a) P(odd numbers greater than 1) b) P(number less than 5) c) P(the number 3 or 7) i got a) 1/3 b) 1/2 c) 1/6 is that right please help.
November 1, 2008

math
hi i did this problem and i just want to know if its right. 3 coins are flipped , find the following probabilities: a) P(2 heads) b) P( at most 2 heads) c) P(no heads) i got a) 1/4 b) .75 c) 5/8
November 1, 2008

math
Suppose a single die is rolled, Find: a)P(6, given that an odd number was rolled) b) P(5, given that an odd number was rolled)
October 31, 2008

MATH
This is a statistics question: ***(A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level of significance is there evidence that the average travel time is greater than 45 minutes? (B) What assumptions must ...
December 16, 2007

MATH
This is a statistics question: (A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level of significance is there evidence that the average travel time is greater than 45 minutes? (B) What assumptions must ...
December 16, 2007

Math(Geometry)
I have problem, I need to fing the pattern in these following problems: #6 4,6,9,13,18... i need the formula.
August 22, 2007

chem
Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air (in grams per liter) at this altitude? (Assume the molar mass of air is 28.96 g/mol.) PV=nRT n/V= molar desity= P/RT mass density= molar density*...
March 30, 2007

chemistry
A helium-filled balloon of the type used in long-distance flying contains 420,000 ft3 (1.2 times 107 L) of helium. Suppose you fill the balloon with helium on the ground, where the pressure is 737 mm Hg and the temperature is 16.0 °C. When the balloon ascends to a height ...
March 30, 2007

MATH Trouble HURRY!!!!
If the scale factor from a small figure to a large figure is given as a percent, how can you find the side lengths of the large figure from the side lengths of the small figure? 34 percent is 34/100 Set that equal to small/large 34/100=small/large, and solve for large. Can you...
January 4, 2007

Chemistry
What mass of silver chromate can be dissolved in 125 mL of water? How do I find this out? Ag2CrO4 is not very soluble. Look up the solubility product and calculate the solubility from Ksp. Wow, thank you so much. I realised that I wrote my chemical formula wrong. I now what to...
October 29, 2006

opinions
If you were going on a 5 day bike tour . how much would you be willing to pay???? Please I need opinions!!!! My opinion. I would not be willing to pay anything. This gives you a minimum. How much I would be willing to pay would depend on how much I get. For example, what are ...
October 2, 2006

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