# Posts by Devin Boutte

Total # Posts: 21

**calculus**

Find the unit vector that is parallel to but has opposite direction as the vector m=<-1,0,2,2>

**calculus**

Given the vector u=<3,1,1>,v=<-2,0,4>. A) compute the area of the parallelogram determined by u and v . B) compute the vector. UxV

**Calculus**

Given the vector u=<3,1,1>,v=<-2,0,4>. A) compute the area of the parallelogram determined by u and v . B) compute the vector. UxV

**Calculus**

Find the unit vector that is parallel to but has opposite direction as the vector m=<-1,0,2,2>

**Chemistry**

The space shuttle uses fuel cells( AFC's) to produce electricity . In these fuel cells,O2 reacts with water and electrons to produce OH- ioins travel to the other electrode where they react with H2 to release electrons and produce more water. Based on this information,...

**Chemistry**

Taking into account the "Second Law of thermodynaics", what is the maximum percentage of heat at 700 C that can be converted into electricity if the waste heat was produced as steam at 100 C?

**Chemistry**

Larger amounts of methane, in the form CH4*6H20 is trapped at the bottom of the ceans in Clatharate compunds (formed when small molecules occupy the empty spaces in cage like structures). Calculate the mass of methane gas trapped with in one Kg of the hydrate

**Chemistry**

Taking into account the "Second Law of thermodynaics", what is the maximum percentage of heat at 700 C that can be converted into electricity if the waste heat was produced as steam at 100 C?

**Chemistry**

Since ethanol is cheaper than gasoline , today's gasoline's contain varying amonts of ethanol to keep prices lower. given that the enthalpy of combustion of ethanol is -1367 kj/mole and that the aveage energy released by one gram of gasoline is 43 kj: ) Calculae the ...

**Chemistry**

Taking into account the "Second Law of thermodynaics", what is the maximum percentage of heat at 700 C that can be converted into electricity if the waste heat was produced as steam at 100 C? Please Give as much detail as possible instructor will not help cause I ...

**Chemistry**

Given that the 2008 concentration of CH4 in the atmosphere was 1.88 ppm, calculate the total mass of CH4 in the atmosphere in 2008. The total mass of the atmosphere was 5.1x10^18 kg and the average molar mass of the atmosphere is 29.0 g/mole

**CHemistry**

Given that the half life of c 14 is 5,700 ,use the method c 14 dating to determine the age of a fossil if it has 25% of c 14 compared to living specimen.

**Chemistry**

the temperature of a gas in sealed container changes from 20. c to 40.0 C. If the volume remains constant,the pressure will change from 660 torr to ?

**Chemistry**

Assume tat you have a sample of a gas in a cylinder with a movable piston at constant pressure. Determine the volume of the gas if the absolute temperature is decreased by twenty-five percent.

**chemistry**

an ideal gas at 75.0 c and 760 .mm hg is contained in a flexible vessel. Its volume is doubled and the pressure remains.unchanged .determine the temperature of the gas as a consequence of these changes

**Chemistry**

If the pressure of 8.0 L of nitrogen gas in a flexible container is decreased to one-fifth of its orginal pressure(at constat teperature)' the volume will now be ?

**physics**

4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30

**physics**

3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force?

**physics**

2. A 10 N object rests on a 10° incline. What is the normal force? What is the parallel force? A 10 kg object rests on a 10° incline. What are the normal and the parallel forces

**physics**

1. A man pulls a 300 N object across a horizontal surface using a 100 N force applied at a 35° angle. What is the normal force? If the object is pulled at constant speed, what is the coefficient of friction

**physics**

5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30