Bruce
Most popular questions and responses by Bruce
physics
2. At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 a. At what time is the angular velocity of the motor shaft zero? b. Calculate
asked on April 27, 2013 
Chemistry
A liquid has a delta(Hvap) of 35.5 kJ/mol and a boiling point of 122 C at 1.00atm. What is its vapor pressure at 113 C?
asked on December 9, 2014 
Physics
In the figure, a thin uniform rod of mass m = 3.05 kg and length L = 1.11 m rotates freely about a horizontal axis A that is perpendicular to the rod and passes through a point at a distance d = 0.201 m from the end of the rod. The kinetic energy of the
asked on July 25, 2015 
Chemistry
Calculate the amount of Na2HPO4*7H2O in grams needed to make 50 mL of a 0.40 M solution. I think this is dealing with molarity but i cant figure it all out for some reason? Help would be greatly appreciated.
asked on March 11, 2012 
Physics
A fully charged 90µF capacitor is discharged through a 60Ω resistor. How long will it take for the capacitor to lose 80% of its initial energy? I know energy is given by E(t)=q(t)^2, but beyond that I really don't know how to solve this. Any
asked on October 24, 2012 
chemistry
You are tasked with preparing a 500mL nutrient solution containing 5mg/L of phosphorous (P), 3mg/L nitrate (NO3 ) and 100 mg/L chloride (Cl). To make this solution, you have powdered sodium chloride, a 100 mg/L solution of phosphorus, a 1000 mg/L of
asked on January 13, 2014 
PreCalculus
. Margaret is planning to invest up to $22,000 in certificates of deposit at City Bank and People’s Bank. She wants to invest at least $2,000 but no more than $14,000 at City Bank. People’s Bank does not insure more than a $15,000 investment, so
asked on December 2, 2010 
Chemistry
Does the mixing of copper (I) nitrate with sodium iodide produce a precipitate? If so, give the molecular equation.
asked on March 23, 2011 
maths literacy, economics, business studies, tourism, English, Afrikaans, L.O
I don't know what to study after grade 12 or where to study I don't have a career choices can someone please help me
asked on January 28, 2016 
Chemistry
A 325.0g piece of gold at 427°C is dropped into 200.0 g of water at 22.0°C. (The specific heat of gold is 0.131 J/g°C.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.) Can you please outline step by step how i
asked on October 22, 2010 
history
was adolf hitler a leader? http://www.historyplace.com/worldwar2/riseofhitler/index.htm Yes, of the German people after their dissatisfaction with the outcome of the Great War. Here are other links:
asked on March 18, 2007 
science
At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by è = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 (15 marks) a. At what time is the angular velocity of the motor shaft zero? b.
asked on April 27, 2013 
geometry
A rectangular prism has dimensions of x + 1, x  1, and x. Write an expression for the total volume of the prism.
asked on June 10, 2011 
Chemistry
Give the molecular, complete ionic, and net ionic equations for the reaction of barium nitrate and sodium sulfate.
asked on March 23, 2011 
math
write the expression in expand form (4.2z)(5y3)
asked on November 11, 2015 
science
Calculate the pH of a solution created by mixing 200.0 mL of 0.400 M acetic acid and 200.0 mL of 1.00 M sodium acetate. Hint: The instant the two solutions are mixed what are the initial concentrations of each?
asked on February 14, 2011 
Math
You have 100 pieces of candy in five bowls. The sum of candy in bowl a and bowl b is 30 pieces. The sum of candy in bowl b and c is 36 pieces. The sum of candy in bowl c and bowl d is 49 pieces of candy. The sum of bowl d and bowl e is 47 pieces of candy.
asked on February 1, 2015 
physics
An 88kg fisherman jumps from a dock into a 131kg rowboat at rest on the west side of the dock. If the velocity of the fisherman is 4.7m/s to the west as he leaves the dock, what is the final velocity of the fisherman and the boat. East is positive.
asked on January 16, 2012 
Chemistry
What volume (in mL) of 1.0 M HCl is required to prepare 500 mL of pH 7.76 buffer using triethanolamine that is 0.020 M in both triethanolamine and triethanolammonium ion?
asked on November 15, 2016 
Physics
There are two polarizing filters that are out of alignment by 30 degrees. If the light of intensity 1.00 W/m^2 and initially polarized halfway between the two filters passes through the two filters, what is the intensity of the transmitted light? I know
asked on December 12, 2012 
Physics
A sinusoidal wave traveling on a string is moving in the positive xdirection. The wave has a wavelength of 8 m, a frequency of 60 Hz, and an amplitude of 9 cm. What is the wave function for this wave? (Use any variable or symbol stated above as
asked on July 17, 2012 
Science
Can you help with this one please? A drop of oil (vol 0.05cm^3) is released on to a calm surface of a pond where it spreads out and covers an area of 40 cm^2. Assume the oil film has uniform thickness equal to the diameter of an oil molecule. Calculate the
asked on February 5, 2007 
Physics
A particular steel guitar string has mass per unit length of 1.79 g/m. and tension of 61.9 N. For the wave speed to be increased by 1.9%, how much should the tension be changed? I tried increasing the wave speed (186 m/s) by 1.9%, plug that into
asked on July 17, 2012 
Physics
The motion of a blockspring system is described by x(t) = A sin(ùt). Find ù, if the potential energy equals the kinetic energy at t = 6.11 s. I'm really not sure how to solve this. It seems that you need more information, either x or A? I appreciate any
asked on July 13, 2012 
Physics
A 3kg mass attached to a spring with k = 130 N/m is oscillating in a vat of oil, which damps the oscillations. (a) If the damping constant of the oil is b = 19 kg/s, how long will it take the amplitude of the oscillations to decrease to 1% of its original
asked on July 12, 2012 
Chemistry
Give the molecular, complete ionic, and net ionic equations for the reaction of phosphoric acid and magnesium carbonate.
asked on March 23, 2011 
Chemistry
According to the BronstedLowry definition of acids and bases, is water an acid or base? Provide examples to support.
asked on March 23, 2011 
Environmental Engineering
The EPA requires hazardous waste incinerators to meet a standard of 99.99% destruction and removal of hazardous constituents injected into the incinerator. Determine the allowable quantity of contaminant in the exit stream if the incinerator is burning
asked on January 15, 2014 
Chemistry
In the laboratory you will be provided with a 1.0 x 105 M primary stock solution of fluorescein (MW=332.31g/mol). The calibration curve should include a blank, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.25 micromolar fluorescein solutions. Since you will be
asked on October 18, 2016 
physics
A uniform brass disk of radius R and mass M with a moment of inertia I about its cylindrical axis of symmetry is at a temperature T = 45 °C. Determine the fractional change in its moment of inertia if it is heated to a temperature of 125 °C. (The linear
asked on July 20, 2012 
Physics
A mass m = 13 kg is connected to two different springs, one on the left and another on the right. It is displaced a distance x to the right from its equilibrium position. (Take k1 = 115 N/m and k2 = 198 N/m.) (a) What is the net force acting on the mass?
asked on July 13, 2012 
Chemistry
Give the molecular, complete ionic, and net ionic equations for the reaction of sulfuric acid and barium hydroxide.
asked on March 23, 2011 
Chemistry
Give the molecular, complete ionic, and net ionic equations for the combination of potassium chloride and magnesium sulfate.
asked on March 23, 2011 
budgeting
Given the following information, construct a program budget. Allocate nonsalary costs on the basis of the relative number of positions in each program. Note: The dispatchers and prevention inspectors report to the chief. Average Total Position Number
asked on March 18, 2007 
Math
I’m number is called a perfect number if a equals the sum of all of its fantastic except itself for instants six is a perfect number because it matters are 1 to 3 and six and 1+2+3 = 6 what is the next greater perfect number
asked on November 28, 2017 
Science
The movement of air and water through a soil is influenced most by the soil’s ______
asked on February 16, 2016 
Calc 2
What is the lim of the square root of x times sin of (1/x) as x approaches infinity
asked on February 19, 2014 
Math
what is the present value of $329 a year for 6 years at a 12 percent discount rate?
asked on June 17, 2013 
stat
When rolling a die, is this an example of a discrete or continuous random variable?
asked on June 17, 2013 
Chemistry
Is it possible to have an acid/base reaction and produce a precipitate as a product as well? If yes, provide an example.
asked on March 23, 2011 
Math
A point is sliding along a curve y^2 = 1 + cos^3(2x) at whatever speed (even depending on time). Compute the ratio of the rates of change of the vertical and horizontal coordinate with respect to time when the point is at (x, y).
asked on November 12, 2010 
science
select one region of the world and identify at least two serious environmental problems, such as soil degradation, air or water pollution, pesticide misuse, overpopulation, wildlife extinction or threatened biodiversity, and deforestation, that impact this
asked on October 1, 2007 
Chemistry
At a given temperature and pressure how does the magnitude of the heat of vaporization of a substance compare with that of its heat of condensation?
asked on December 9, 2014 
math
The variance of the standard normal distribution is equal to
asked on April 11, 2013 
math
If the highest score is100 and the average score for12 students is 95. What is the lowest score in order to get the average of 95?
asked on February 5, 2013 
physics
The label on a soft drink states that 11 fl. oz (325 g) provides 285 kcal. The drink is cooled to 12.0°C before it is consumed. It then reaches body temperature of 37°C. Find the net energy content of the drink. (Hint: You can treat the soft drink as
asked on July 23, 2012 
Physics
The initial velocity of a 2.04 kg block sliding down a frictionless inclined plane is found to be 1.24 m/s. Then 1.23 s later, it has a velocity of 6.70 m/s. What is the angle of the plane with respect to the horizontal? im lost.....
asked on January 30, 2012 
Chemistry
What is the concentration of an acetic acid solution if 11.2 mL of 1.002 Molarity sodium hydroxide solution is needed to completely neutralize 5.1 mL of the acid?
asked on March 23, 2011 
Chemistry
Which solution has the lower freezing point? 11.0 g of methanol in 100. g of water OR 22.0 g of ethanol in 200. g of water?
asked on December 8, 2014 
calculus
object 380 ft above surface of globe. Horizon is 65.3 degrees from object. What is circumference of globe?
asked on November 15, 2014 
Math
12 years at 5% compounded annually what is the future value of $557?
asked on June 17, 2013 
life orientation
Identify one human factor that causes ill health;accident and disaster.
asked on April 18, 2013 
Physics
The electric field intensity at a point 2 meters from the surface of a uniformly charged conducting sphere is 1920 N/C. At a point 4 meters from its center, the electric field intensity is 3000 N/C. a.) Determine the radius of the sphere. Determine the
asked on February 4, 2013 
Engineering
A certain OTA with a transconductance of 5000 µS has a load resistance of 10 kÙ. If the input voltage is 100 mV, what is the output current? What is the output voltage?
asked on April 5, 2012 
algebra
Writ an algebric expression for this statement.Ama is N year old now.How old will she be in 10 years.
asked on February 2, 2012 
statistics
) If this data were normally distributed, determine the probability that the sample mean would be as far away from the population mean or more so
asked on April 17, 2011 
Chemistry
How many mL of 1.211 Molarity sulfuric acid is required to completely neutralize 10.0 mL of 3.210 Molarity calcium hydroxide?
asked on March 23, 2011 
Chemistry
Give the molecular, complete ionic, and net ionic equations for the reaction of ammonia with hydrochloric acid.
asked on March 23, 2011 
Chemistry
How many grams of water are produced from the reaction of 1L of 2 molarity hydrochloric acid with 1L of 2 Molarity barium hydroxide?
asked on March 23, 2011 
Chemistry
Most chlorides are soluble in water. Give all of the formulae for the insoluble chlorides.
asked on March 23, 2011 
math
Billy has a bag of candy that contains 13 red pieces, 9 green pieces, 3 yellow pieces, and 7 orange pieces. If Billy reaches into the bag without looking, what color is he least likely to get?
asked on January 9, 2011 
college algebra
What is 1.7^0.3326 = ?
asked on September 12, 2010 
social study
Complete a venn digram to compare and contrast
asked on August 21, 2008 
english
what shows phillip prejudice?
asked on April 28, 2008 
Ethics
Are fetalprotection policies discriminatory? Why?
asked on November 17, 2007 
Algebra
I cannot seem to work this problem out correctly as all answers found do not make the equation work. 1/4  2/3y = 3/4  1/3y
asked on October 3, 2007 
Graph Theory
Let S be a sequence of exactly one positive integers, n. what is the least number of 1s needed to be added to make it graphical?
asked on October 28, 2016 
Math
If a person is charged 1.5 cents per mile,how much will he have to pay after he drives one thousand miles?
asked on February 18, 2016 
MATH
WHAT DOES THIS SERVICE COST?
asked on February 19, 2014 
MATH TUTOR
HOW MUCH IS YOUR SERVICE?
asked on February 19, 2014 
hvac school
What temp would a fixed volume of gas need to be heated in order to double its pressure if it starts out at 25?
asked on November 30, 2012 
Physics
A beam of Xrays with a wavelength ƒÜ of 0.179nm is directed at an iron crystal whose planes have a spacing of 0.1013nm. How many diffraction peaks (each arising from a different order n) are possible? I'm really not sure how to go about solving this.
asked on September 19, 2012 
science
What cellular structures must an angiosperm have to survive?
asked on August 28, 2012 
ALGEBRA
1.2G DIVIDED BY 3CM TO THE THIRD POWER
asked on August 26, 2012 
Maths
N+10N=0
asked on February 2, 2012 
math
In a triangle, between J and K is 30in and between J and L is 25 degree, what is the measure of
asked on December 7, 2011 
algebra
(5ay)exponent 3
asked on February 28, 2011 
critical thinking
How can I apply critical thinking when evaluating, articles, advertising, media and conversations?
asked on October 9, 2009 
Social Study
two views of reconstruction
asked on August 21, 2008

geometry
88
posted on May 27, 2016 
Science! Help!!
I'm from there to. But is it C, B or A?
posted on May 12, 2016 
Math
A car travels at a steady rate of 55 mph. If the car travels for three hours nonstop, what are the domain and range of the distance function during the trip?
posted on April 28, 2016 
Solving Rational Equations
60
posted on April 11, 2016 
College physcial science
40000j
posted on July 15, 2015 
Physics
234
posted on April 8, 2015 
chemistry
Thank you for your help! For part c, I'm not sure what you mean finding Na from NO3^?
posted on January 14, 2014 
math
Unless your teacher gives you 5700 as the half life.
posted on February 27, 2013 
Physics
The intensity of the light isn't halved after it passes through each filter? That's what I don't understand. Thank you for your help!
posted on December 13, 2012 
Physics
thank you!
posted on October 24, 2012 
Physics
Thamk you for your help.
posted on September 20, 2012 
physics
thank you for your help!
posted on July 24, 2012 
physics
thank you!
posted on July 23, 2012 
Physics
thank you very much!
posted on July 17, 2012 
Physics
Thank you so much for your help!
posted on July 14, 2012 
Physics
Thank you for your help!
posted on July 13, 2012 
Chemistry
In reality you probably could, however it is not good science as it has been considered to be contamined or already used and a new substance or solution should be obtained. I know this is wasteful but, that is just how it is.
posted on March 11, 2012 
Chemistry
I got 0.02 g is this right?
posted on March 11, 2012 
Chemistry
just steps is all i really need i think i need the molecular weights first then just simple molarity am i correct?
posted on March 11, 2012 
chemistry
M=3.65*10^5
posted on March 9, 2012 
Trig!
Sin2x
posted on November 6, 2011