Posts by robert
Total # Posts: 988
Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment was closely supervised by our teacher to ...
October 26, 2011
A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?
October 12, 2011
Ayres Services acquired an asset for $80 million in 2011. The asset is depreciated for financial reporting purposes over four years on a straight-line basis (no residual value). For tax purposes the asset's cost is depreciated by MACRS. The enacted tax rate is 40%. Amounts...
September 28, 2011
3. A processor makes two components, A and B, which are then packaged together as the final product (each product sold contains one A and one B). The processor can do only one component at a time: either it can make As or it can make Bs. There is a setup time when switching ...
August 28, 2011
compare and contrast the strengths and weaknesses of two different approaches to study the following issue: You have developed a new drug that you believe is effective in reducing appetite. As a result of some preliminary research, you have been given a small grant to design ...
August 14, 2011
The formula h=48t-16t^2 gives the height, h, in feet, of an object projected into the air after t seconds. If an object is propelled upward, at what time(s) will it reach a height of 32 feet above the ground?
July 27, 2011
What types of technology do people utilize to communicate? How does technology change the way people communicate? What does technology bring to communication other than the technology itself?
July 27, 2011
The way business communication is conducted [Passive voice] in the workplace experiences regular changes with the advances in technology that makes communication faster and easier.
July 26, 2011
this is a optimization problem A construction company has been offered a contract for $7.8 million to construct and operate a trucking route for five years to transport ore from a mine site to a smelter. The smelter is located on a major highway, and the mine is 3 km into a ...
July 25, 2011
Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat: C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 ...
July 12, 2011
Suppose 2 balls of same mass are held by 4 ropes, 2 for each ball. One ball is held by 2 ropes fastened at same height to something and the other at different heights. If the angles made by each respective pair of ropes(eg. right to right) are equal, are tensions in each ...
June 27, 2011
A 300. kg roller coaster car is traveling at a constant speed of 15 m/s over a hill with a radius of curvature of 30. m. b. What is the normal force acting on the car at the top of the hill? c. Assume that the car is at the intersection of the radius and the hill and that a ...
May 1, 2011
MrMath, please do not post aany answers to this question. My daughter, thinking she would help me with hoemwork posted this. I appreciate your time but do not need any assistance as I have a good understanding of the material. I have asked the site to delete this post. Sorry ...
April 15, 2011
1- A SQL statement is needed to create a stored procedure that has one input parameter of data type int. The stored proc selects the supplierId field and the total, or sum, of all Count field values for each group of supplierId fields from the Part table. The Part table was ...
April 15, 2011
SCI207:Dependence of Man on the Environment
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...
April 12, 2011
a 20.0-L vessel at 700 K initially contains HI (g) at a pressure of 6.20 atm;at equilibrium, it is found that the partial pressure of H2 (g) is .600 atm. What is the partial pressure of HI (g) at equilibrium?
March 31, 2011
a 2 kg block slides down a frictionless incline from point A to point B. A force(magnitude P=3N) acts on the block between A and B, as shown. Points A and B are 2 m apart. If the kinetic energy of the block at A is 10 J, and the work done by gravity is 20J, what is the KE of ...
March 24, 2011
A 305 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work done by the ...
March 23, 2011
This site looks not bad, but I personally not like this blood pressure chart. It hard to understand, and i using mostly bloodpressuremagazine[dot]com to check my blood pressure readings. It nice what all in one place, like normal blood pressure and hypertension.
March 20, 2011
An NFL punter at the 15-yard line kicks a football with an initial velocity of 95 feet per second at an angle of elevation of 28 degrees. Let (t) be the elapsed time since the football is kicked. a. Write the parametric equations of this problem. b. With (t)=0 at the time of ...
March 15, 2011
Physics concept question
A long straight horizontal wire carries a current I = 2.10 A to the left. A positive 1.00 C charge moves to the right at a distance 4.50 m above the wire at constant speed v = 2250 m/s. What are the magnitude and the direction of the magnetic force on the charge? h t tp:// ...
March 7, 2011
Physics - Current Loop
A current loop in a motor has an area of 0.85 cm^2. It carries a 240 mA current in a uniform field of 0.62 T. What is the magnitude of the maximum torque on the current loop?
March 7, 2011
Physics- Charge in electromagnetic field
An antiproton (which has the same properties as a proton except that its charge is -e) is moving in the combined electric and magnetic fields of the figure: h tt p://post image. org/image/2sh3s3hs4/ What are the magnitude and direction of the antiproton's acceleration at ...
March 7, 2011
Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation. Cr2O72− + 6 Fe2+ + 14 H+ 2 Cr3+ + 6 Fe3+ + 7 H2O If it takes 44.0 mL of 0.0250 M K2Cr2O7 to titrate 25.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+?
March 3, 2011
The results of a medical test show that of 66 people selected at random who were given the test, 3 tested positive and 63 tested negative. Determine the odds in favor of a person selected at random testing positive on the test.
February 24, 2011
the coefficient of restitution between the ball and the floor is 0.60 If the ball is drop from rest at the height of 6.6 m from the floor. Find a) what is the maximum height will the ball attain after the first bounce. b) how much kinetic energy is lost duirng the impact if ...
February 21, 2011
Need help balancing this equation, just the coeffecients, do not need to balance the charges. The numbers are subscripts: Ca0.41Mg0.36Mn0.50Fe1.76Al2Si3O12 + H + H20 <---> Al(OH)3 + FeOOH + MnO2 + Ca + Mg + Si(OH)4
January 29, 2011
Michelle sold tickets for the basketball game. Each adult ticket costs 3$ and each student ticket costs 1.50. There were 105 tickets sold for a total of 250$. How many of each type of ticket were sold?
January 14, 2011
A 1125 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 17 km/h. The car now stops, and the ...
December 13, 2010
6/10 is how long he taught 8th grade so 10 - 6 = 4 is how long he taught something else. The new fraction would be 4/10 but if you simplify it, 2 being the common factor in both you would get 2/5 4 = 2 * 2 10 = 2 * 5
December 12, 2010
Another question in regards to CT. I know CT refers to the clockwise turn of the meter stick but how can you picture it going in that direction? With no weight on the ruler, isn't it at an equilibrium?
December 12, 2010
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.00 g coins stacked over the 7.0 cm mark, the stick is found to balance at the 41.0 cm mark. What is the mass of the meter stick? The answer is 38g but I don't understand how to get it.
December 12, 2010
Do an ESSAY Using Kohlberg's three levels and six stages of moral reasoning, create a character that passes through each stage and explain how she/he responds to moral dilemmas present at each stage.
December 11, 2010
Physics ( check answers)
warren moon throws a footbal with a velocity of 20 m/s at an angle of 30 degrees with the horizontal. air resistance may be ignored. how much time is required for the football to reach the highest point of the trajectory
December 9, 2010