# Posts by KnowsNothing

Total # Posts: 10

**Chemistry 12**

The complete combustion of 1.00mL of octane increases the temperature of 250.00g of water by 22.7 degrees Celsius. The density of octane is 0.70g/mL. What is the efficiency of the octane in heating the water? I attempted this question and I have -400 something percent ...

*February 4, 2013*

**Math (Adv. Functions)**

Given that triangle ABC with sides a, b, and c, show that the area of the triangle is given by A = ((a^2)(sinB)(sinC))/((2sin(B+C)))

*December 12, 2012*

**Chemistry**

Is lead non-polar covalent, polar covalent, ionic, network, or metallic and why?

*November 30, 2012*

**calculus (vectors)**

Determine a vector that is orthogonal to the vector e = [3, -1, 4]

*October 20, 2012*

**Chemistry**

A molecule has a glycerol backbone. The branches off of the three carbons are as follows: o-co-(ch2)14 - ch3 o-co-(ch2)12 - ch3 o-co-(ch2)16 - ch3 What is this compound called?

*October 13, 2012*

**math**

When a polynomial is divided by (x+2), the remainder is -19. When the same polynomial is divided by (x-1), the remainder is 2. Determine the remainder when the polynomial is divided by (x-1)(x+2).

*October 12, 2012*

**Physics**

In a Milliken type experiment, two horizontal parallel plates are 1.0 cm apart. A sphere of mass 2.2 x 10^(-13) kg remains stationary when the potential difference between the plates is 350V with the upper plate is negative. How much excess or deficit of electrons does the ...

*July 23, 2012*

**Physics**

What is the difference between electric force, electric potential energy, electric field strength, electric potential, and electric potential difference?

*July 20, 2012*

**Physics**

THANK YOU. ;A;

*July 17, 2012*

**Physics**

A bullet with the mass of 45 g is fired into an 8.3 kg block of wood resting on a floor against a spring. This ideal spring (k = 76 N/m) has a maximum compression of 28 cm. What was the initial speed of the bullet?

*July 17, 2012*

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