Thursday
April 28, 2016

Posts by samuel

Total # Posts: 233

Calculus
A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1.4 m/s, how fast is the boat approaching the dock when it is 9 m from the dock?
March 2, 2010

Calculus
A voltage V across a resistance R generates a current I=VR. If a constant voltage of 4 volts is put across a resistance that is increasing at a rate of 0.3 ohms per second when the resistance is 4 ohms, at what rate is the current changing? (Give units.)
March 1, 2010

Calculus
At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 23 knots and ship B is sailing north at 17 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)
March 1, 2010

chem
why does fluorine have a higher ionization energy than iodine?
January 24, 2010

chem
why do elements in the same family generally have similar properties?
January 24, 2010

chem
what does the heating curve of ethanol look like? im really confused about this...
January 21, 2010

CHEM
on a heating curve graph...what factors determine the lengths of the flat regions of the graph and slope of the curve between the flat regions
January 21, 2010

French
What can you find in Santa Claus' bag? descramble "ELASEL" (in french) I need help....
December 18, 2009

s
unscramble "elasel" in french; unscramble "ionmaes" in french. Thank you
December 17, 2009

chem
22.25 ml?
December 14, 2009

chem
3.56mL?
December 14, 2009

chem
What volume of 0.200 M H2SO4 will be needed to neutralize 50mL of 0.178 N NaOH? i don't even know how to start
December 14, 2009

Social Studies
When water sinks into the soil, what does it become?
September 11, 2009

college(natural disasters)
How can the magnatic record inside a valcanic roskbe used to determine the latitude at which the lava cooled?
September 7, 2009

natural disasters
how can the magnatic record inside a valcanic roskbe used to determine the latitude at which the lava cooled?
September 7, 2009

English
For example, when people ask "We don't have to hand in the assignment right?" Why do some people answer "No." (They meant the assignment does not have to be handed in.) But if so, should the answer be "Yes." (Yes, that's right, we don'...
May 15, 2009

Math
Dear Readers, I am a 6th grader that recently took a math test. I got a question wrong, and I think it was because I don't know the definition to the question. Can you please tell me what an interval in mathematical terms is. Please give me something a 6th grader can ...
March 5, 2009

statistics
Which of the following is an example of nominal data? a. ocean temperature at seven beaches along the east coast of the U. S. b. 1st, 2nd, and 3rd place finishers of the 2005 Boston Marathon c. morning commute (in miles) of professors at DeVry University - Phoenix d. account ...
February 4, 2009

5th grade
bbbnbbvhv
January 8, 2009

calculus
Find the points on the curve y = 2x^3 + 3x^2 - 12x + 1 where the tangent is horizontal
October 14, 2008

physics
Alley club-ax consists of a symmetrical 8 kg stone attached to the end of a uniform 2.5 kg stick that is 98 cm long. The dimensions of the club-ax are that the stcik is 80 cm across and the stone is tied to the stick is 18 cm long. How far is the center of mass from the handle...
October 13, 2008

physics
Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, respectively, are connected by massless rods. What are the coordinates of the center of mass?
October 13, 2008

physics
A water molecule consists of an oxygen atom and two hydrogen atoms. Oxygen has a mass of 16 atomic units (u) and each hydrogen has a mass of 1 u. The hydrogen atoms are each at an average distance of 96 pm ( 96 x 10 -12 m) from the oxygen atom, and are separated from one ...
October 13, 2008

HISTORY
what features of the welfare state did the new deal create?
October 13, 2008

physics
A pendulum consists of an object of mass 1.07 kg that hangs at the end of a massless bar, a distance 1.14 m from the pivot point. Calculate the magnitude of the torque due to gravity about the pivot point if the bar makes an angle of 22° with the vertical. torque = ...
October 13, 2008

physics
An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics - bobpursley, Saturday...
October 13, 2008

chemistry
Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium after placing 5.00 ...
October 13, 2008

HISTORY HELP
I'm reading my book and from what i'm getting here is that the progressives demanded a more activist government but what im not understanding is how they justified their demands.
October 12, 2008

Algebra
Write the slope-intercept form of an equation for each line, given either the slope and the y-intercept or the coordinates of two points. (5, -3) and (-4, -3)
May 5, 2008

Algebra
Determine whether the graphs of the equations are parallel, perpendicular, or neither. y=-x+2 y=-x-3
May 5, 2008

drug chart help
Does anyone know a site that has information about drugs (narcotics, stimulants, depressants, hallucinogens, etc...) with the following info: Name of Drug Slang Name Source How it Looks How it's Used Short Effect Duration Physical (Yes/No) Psychological Addiction (Yes/No) ...
January 10, 2008

Physics
Work is transferred, not made.
October 23, 2007

physics
A:0.124764 meter
October 9, 2007

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