Sunday

December 21, 2014

December 21, 2014

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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