Saturday
September 20, 2014

Posts by Bert


Total # Posts: 30

Physics
Two cars are parked on a street. A third car hits the back of the second car and causes all of the cars to move. (Ignore the distance between the cars). Calculate: (a)The acceleration of the whole system; (b)the net force on each car; (c)the contact force that each car exerts ...
March 14, 2014

Physics
A mountain climber dangles his water bottle and feels the bottle makes an angle of 25 degrees with respect to the vertical line. If his acceleration takes 18 seconds, calculate the speed of the climber.
March 14, 2014

math
Together, Misty and Keith caught 29 fish. Keith caught 5 fewer fish than Misty. How many did they each catch?
October 10, 2012

Physics
If the critical frequency of a low-pass filter is 5 kHz, what is the filter bandwidth?
April 5, 2012

Physics
If the two input voltages to a 2-input summing amplifier are +2 V and +5 V, what is the output voltage?
April 4, 2012

Chemistry
A certain shade of blue had a frequency of 1.01*10^-4 Hz. What is the energy of exactly one photon of this light?
March 20, 2011

Chemistry
50 ml of 5 M H2SO4 react with excess BaCl2 to Make 40 g of BaSO4. a.) What is the theoretical yield of BaSO4? b.) What is the Percentage yield of BaSO4
November 4, 2010

Science
Is the answer 26 celsius? Is it possible that the temp is greater than 25 celsius? A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that ...
January 21, 2010

Science
Does c in the equation stand for temperature in celsius?
January 21, 2010

Science
A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that container is insulated and does not change temperature.
January 21, 2010

Science
Does c stand for temperature in celsius?
January 20, 2010

Science
What do Tf and Hf stand for? Are they constants? Also, is Tf different from tf?
January 20, 2010

Science
A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that container is insulated and does not change temperature.
January 20, 2010

Statistics
When circuit boards used in the manufacture of compact disc players are tested, it is discovered that each has a 5% chance of being defective. Suppose that a batch of 25 of these circuit boards is randomly selected. Would this be binomial or poission distribution?
September 25, 2009

differential geometry
given a circle in S^2 with radius p in the spherical metric, show its area is 2pi(1-cos p)
May 4, 2009

bio
Transformation efficiency = (Total number of cells growing on the agar plate) / (Amount of DNA spread on the agar plate (in µg)). So if the transformation efficiency is 4 x 10^3 and the amount of plasmid on the plate is 0.04 micrograms, then: 4 x 10^3 = x / 0.04 ...
April 21, 2009

Cell Biology
What is the theoretical limit of resolution in micrometers when there is a numerical aperture (N.A) of 0.10, 500nm wavelength, and 4X magnification?
August 26, 2008

Organic Chem
NaCl was used to rinse a condenser after distillation of 4-methylcyclohexene to remove unreacted phosphoric acid. Why is saturated NaCl used to rinse the glassware rather than water?
July 10, 2008

Organic Chemistry
What major product is formed by the dehydration of 1,2-cyclohexanediol (consider keto-enol tautomerism)?
July 10, 2008

Organic Chemistry
HCl is added to t-pentyl alcohol in a vial to synthesize t-pentyl chloride. t-pentyl chloride separates on top and the bottom layer is discarded. Sodium bicarbonate is then used to wash the crude t-pentyl chloride. What is the purpose of this wash and why would it be bad to ...
July 7, 2008

MATH!!!!!!!
The river boat paddled upstream at 12km/h, stopped for 2 h of sightseeing, and paddled back at 18km/h. How far upstream did the boat travel if the total time for the trip, including the stop, was 7h? Please help me, the answer is 36 km but i have no idea how to set it up
January 8, 2008

chemisty
Consider the titration of 50 mL of 0.15 M NH3 with 0.1 M HCl. What is the pH at the equivalence point of the titration? (Kb= 1.8X 10-5 Ka= 5.6X10-10)
December 7, 2007

Math
The numbers are 45 and 7, how do you calculate the ratio?
August 30, 2007

History
Could it be described as the state taking total control over the church by determining how the church will function? I was thinking that after the Roman Empire established Christianity the primary religion that the state was able to over-rule and control the Catholic church. ...
August 26, 2007

History
What was the relationship between church and state during the 16th Protestent Reformation?
August 26, 2007

Chemistry
I dont understand where the H+ comes from, I mean I know it comes from the acid, but dont I need an equilibrium constant K to solve for the H+?
August 22, 2007

Chemistry
If 100mL of a 0.10M NaOH solution is added to 75mL of a 0.15 HCl solution, then what is the pH of the resultant solution?
August 22, 2007

History
During the 16th century protestent reformation, what was the relationship between the church and state? http://en.wikipedia.org/wiki/Protestant_reformation Let us know what you conclude, and someone here will be able to critique your thinking. =)
August 20, 2007

Physics
If a solid glass cylinder is placed above the words Lead Oxide (Lead in red print and Oxide in blue) and viewed from the side, the word Lead appears inverted, but the word Oxide does not. Explain. What part of the cylinder is on top of the letters? From what direction is it ...
March 29, 2007

Physics
Suppose you are told that only two colors of light (X and Y) are sent through a glass prism and that X is bent more than Y. Which color travels more slowly in the prism? The one that is bent more travels slower. If white light is sent through a prism, the colors on the other ...
March 14, 2007

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