# Posts by Kels

Total # Posts: 16

**boston high school**

find the circumference of a circle if the diameter is 5.15 meters

*December 9, 2015*

**Econ**

not sure

*October 7, 2013*

**science**

A uranium and iron atom reside a distance R = 28.70 nm apart. The uranium atom is singly ionized; the iron atom is doubly ionized. Calculate the distance r from the uranium atom necessary for an electron to reside in equilibrium. Ignore the insignificant gravitational ...

*February 19, 2013*

**science**

There are two identical, positively charged conducting spheres fixed in space. The spheres are 44.6 cm apart (center to center) and repel each other with an electrostatic force of F1 = 0.0675 N. Then, a thin conducting wire connects the spheres, redistributing the charge on ...

*February 19, 2013*

**science**

A 2.75-gram air inflated balloon is given an excess negative charge, q1 = -3.00 × 10-8 C, by rubbing it with a blanket. It is found that a charged rod can be held above the balloon at a distance of d = 5.80 cm to make the balloon float. In order for this to occur, what ...

*February 19, 2013*

**science**

A uranium and iron atom reside a distance R = 28.70 nm apart. The uranium atom is singly ionized; the iron atom is doubly ionized. Calculate the distance r from the uranium atom necessary for an electron to reside in equilibrium. Ignore the insignificant gravitational ...

*February 19, 2013*

**science**

There are two identical, positively charged conducting spheres fixed in space. The spheres are 44.6 cm apart (center to center) and repel each other with an electrostatic force of F1 = 0.0675 N. Then, a thin conducting wire connects the spheres, redistributing the charge on ...

*February 19, 2013*

**math**

A person in a lighthouse notices two boats out on the ocean. The angle of depression to the further boat is 20 degrees while the angle of depression to the closer boat is 75 degrees. What is the distance between the two boats if the observer in the lighthouse is 60 feet off ...

*January 29, 2013*

**math**

495 Find three coterminal angles: ____________ ____________ ____________ Standard position angle: Reference angle:

*January 29, 2013*

**physics**

one liter (1000cm3) of oil is spiled onto a smooth lake. if the oil spreads out uniformly until it makes an oil slick justone molecure thick, with adjcent molecules just touching estimate the diameter of the oil slick. Assume the oil molecules have a diameter of 2X10-10 m.

*August 21, 2012*

**Physics**

Why do you multiply by .5?

*October 7, 2011*

**Physics HELP**

A student has six textbooks, each with a thickness of 4.0 cm and a weight of 30 N. What is the minimum work the student would have to do to place all the books in a single vertical stack, starting with all the books on the surface of the table?

*October 4, 2011*

**Physics**

A spring has a spring constant of 42 N/m. How much work is required to stretch the spring 1.5 cm from its equilibrium position?

*October 4, 2011*

**science**

The work done by one mole of a monatomic ideal gas (y=5/3) in expanding adiabatically is 825 J. The initial temperature and volume of the gas are 393 K and 0.100 m3. Obtain (a) the final temperature and (b) the final volume of the gas.

*June 9, 2010*

**physics**

The work done by one mole of a monatomic ideal gas () in expanding adiabatically is 825 J. The initial temperature and volume of the gas are 393 K and 0.100 m3. Obtain (a) the final temperature and (b) the final volume of the gas.

*June 9, 2010*

**Algebra**

i need help in finding this answer find the value of r so that the line through (8,R) and (4,5) has a slope of negative

*March 10, 2008*

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