# Posts by Dar

Total # Posts: 23

**science**

which of the following explains why your body may contain a carbon atom that was present in George Washington's body in 1776

*December 5, 2013*

**Math**

This needs to be worked backwards. Four classmates are comparing the number of pages that they have read in a novel assigned for their language-arts class. Ken has read twice as many pages as Jenny. Alicia has read 18 pages more than Jenny and 11 pages more than Mark. Mark has...

*April 18, 2013*

**Math**

Four classmates are comparing the number of pages that they have read in a novel assigned for their language-arts class. Ken has read twice as many pages as Jenny. Alicia has read 18 pages more than Jenny and 11 pages more than Mark. Mark has read 38 pages. How many pages has ...

*April 18, 2013*

**math**

You would divide $13.75 by $2.75 and the answer is the video was overdue 5 days

*February 3, 2013*

**Algebra I**

Here is the question. Medical X-rays, with a wavelength of about 10^-10m, can penetrate completely through your skin. a. Ultraviolet rays, which cause sun burn by penetrating only the top level of skin, have a wavelength about 1000 times the wavelength of an x-ray. Find the ...

*February 3, 2013*

**science**

You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (if you run any faster, you’ll be caught for running). How much time will it take to get to your class?

*January 11, 2013*

**Math**

what is 4 5/6 + 3 2/3? First I had to find out the LCD which is 12. since 6 goes into 12 twice I X 5 by 2 and got 4 10/12 + 3 8/12 which gave me 7 18/12 I divided that by 2 and got 7 9/6 and then divided that by 3 and got 7 3/2 which I thought was my answer but the that wasn&#...

*December 27, 2012*

**Math**

I need to find the sum of 1/6 and 1/2. I found the LCD to be 2 so I multiplied that by the numerator and got 2/2+2/2=4/2 and simplified that to 1/2. But the answers that I get to choose from are 1/3, 1/4, 2/3 and 3/4. What did I do wrong?

*December 10, 2012*

**math**

I need to find the sum of 2/5 and 3/4. The LCD is 20 so I did 2x4=8 and 3x5=15. so I got 8/20 + 15/20 = 23/20, but this does not match any of the answers I have to pick from. What am I doing wrong?

*December 9, 2012*

**Math**

There are 24 students in a class, 16 are girls and 8 are boys. What is the fraction of boys in the class?

*November 20, 2012*

**History**

what was the volcono called that covered the city of pompeii in 79 AD

*January 7, 2012*

**History**

what is the term for the blending of greek and roman culture?

*January 7, 2012*

**History**

what were the structure that the romans built to carry water to distant places?

*January 7, 2012*

**physics**

Two small identical metal spheres, A and B, on insulated stands, are each given a charge of +2.4 10-6 coulomb. The distance between the spheres is 7 10-1 meter. Calculate the magnitude of the electrostatic force that the charge on sphere A exerts on the charge on sphere B. ...

*March 24, 2010*

**Physics**

Two charged Ping-Pong balls separated by a distance of 1.20 m exert an electric force of 0.0300 N on each other. What will be the force if the objects are brought closer, to a separation of only 30.0 cm? _____N

*March 22, 2010*

**Physics**

Two charged dust particles exert a force of 3.8 10^-2 N on each other. What will be the force if they are moved so they are only one third as far apart? ________N

*March 22, 2010*

**physics**

Two charged spheres are 18.0 cm apart. They are moved, and the force on each of them is found to have been doubled. How far apart are they now? ______cm

*March 22, 2010*

**Classroom Management Techniques**

this is what I have for the same questions.. 1) A 2) A 3} C 4} B 5} B 6} B 7} C 8] B 9} C 10} C 11} C 12} A 13}B 14] A 15}B 16} B 17} ?? 18}B 19}D 20} B Let me know if you have the same? thanks

*March 22, 2010*

**physics**

A 25.0 kg block is pulled 4.5 meters up a 20° rough incline by an applied force Fa = 200 N, directed up the ramp. The block starts from rest and has a final speed of 1.5 m/s. Find the following: a) The total work done on the block, Wtot =___ J b) The work done on the block...

*February 22, 2010*

**Physics**

A comet with a mass of 7.95 1011 kg strikes Earth at a speed of 22 km/s. (a) Find the kinetic energy of the comet in joules. ____ J (b) Compare the work that is done by Earth in stopping the comet to the 4.2 1015 J of energy that was released by the largest nuclear weapon ever...

*February 18, 2010*

**Physics**

A block is pulled 2.9 meters up a 30° rough incline by an applied force Fa = 170 N, directed up the ramp. The frictional force has a magnitude of 90 N. The block starts from rest and has a final kinetic energy of 16 J. Find the following: a) The total work done on the ...

*February 18, 2010*

**Physics**

Pam, wearing a rocket pack, stands on frictionless ice. She has a mass of 44 kg. The rocket supplies a constant force for 22.0 m, and Pam acquires a speed of 62.5 m/s. Assume that air resistance is negligible. (a) What is the magnitude of the force?

*February 18, 2010*

**Physics**

In the 1950s, an experimental train that had a mass of 2.65 104 kg was powered across a level track by a jet engine that produced a thrust of 5.25 105 N for a distance of 509 m. Assume that air resistance is negligible. (b) Find the change in kinetic energy. J____ (c) Find the...

*February 18, 2010*

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