Saturday
December 20, 2014

Posts by bob


Total # Posts: 2,499

Physics
At a restaurant, your glass of water contains 25% ice while your friend’s glass of water contains 75% ice. What can you say about their temperatures? Explain your answer
May 29, 2012

chemistry
haallllp me
May 29, 2012

Physics
You are heating water in a pot on the stove. Shortly before the water boils properly, bubbles of steam begin rising from the bottom of the pot but vanish before they reach the water’s surface. What happened to those bubbles?
May 28, 2012

Physics
At a restaurant, your glass of water contains 25% ice while your friend’s glass of water contains 75% ice. What can you say about their temperatures? Explain your answer.
May 28, 2012

Physics
A thermoelectric-based power meter has a response time of 20 s and sensitivity (output voltage per unit incident power) of 90 mV/W. If the time response is reduced to 8 s by increasing the thermal conductance between the sensor element and heat sink, what will be the new ...
May 26, 2012

Physics
When you take a bath, how many kg of hot water (49 C) must you mix with cold water (13 C) so that the temperature of the bath is 36 C? The total mass of the water (hot and cold) is 191 kg.
May 23, 2012

Physics
At a birthday party, a student ate a piece of cake (food energy value of 400 calories). To prevent this energy from being stored as fat, she decides to drink ice water at 0 C. She reasons that the ingested ice water will be warmed up to her normal body temperature of 37 C and ...
May 23, 2012

Physics
How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point (at 100 C)?
May 23, 2012

Physics
A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C. Neglecting any heat losses to the environment, what is the equilibrium temperature?
May 23, 2012

Algebra 2
Combine The Rational Expressions and Simplify (3x-7)/(x^2-12x+27)-(3x-8)/(x^2-9x+18)+(x+2)/(x^2-15x+54)
May 22, 2012

Geometry
Find the arc length, of a 130 degree arc, in a circle with a diameter of 7.2 inches. Round your answer to the nearest thousandth
May 20, 2012

Chemistry
If a gas has a volume of 500 ml and pressure of 1.5 atm, what will the pressure be if the volume is reduced to 250 ml?
May 18, 2012

english
or parental love?
May 18, 2012

english
thank you sir, according to my reading, i reckon it's forgiveness as the father forgives his son for wasting the money?
May 18, 2012

english
okay it's obstacles. thank you. What is the main idea of “The Parable of the Prodigal Son”? a. sibling rivalry b. selfishness c. forgiveness d. parental love
May 18, 2012

english
listen i really need your help. I have to get these questions right or i wont be able to graduate so id really appreciate it if you could answer it. It would mean alot
May 18, 2012

english
a. statues b. obstacles c. arguments d. violations
May 18, 2012

english
Which word is closest in meaning to “impediments”?
May 18, 2012

Information Systems in Organizations
C C C D B
May 17, 2012

social studies 9
Dickens is famous for the names he gave to his characters-- Uriaha heap, mr gradgrind and little doritt are a few examples. often theses names help us ...
May 17, 2012

Physics
Suppose you are getting ready to take a nap, and you have a choice of lying stretched out on your back on a) a bed of nails, b) a hardwood floor, or c) a couch. Which one would you choose for the most comfort, and WHY?
May 15, 2012

Physics
Your right rear tire has to support a weight of 3000 Newtons. Normally the contact area of your tire with the road is 200 square centimeters. If the pressure in your tire is suddenly reduced from 32 pounds per square inch to 16 pounds per square inch, what must be the new ...
May 15, 2012

Physics
Two identical objects, one moving twice as fast as the other, collide with each other in the following way: 0--------> 2v v <----0 m m If the two objects stick together after the collision, will they be moving to the right, to the left, or not at all? Explain your answer.
May 15, 2012

algebra 2
solve using substitution x^+y^-100=0 x+y-14=0
May 14, 2012

English
your a B*tch
May 13, 2012

Math
fsdfsdf
May 11, 2012

Physics
A physics textbook is launched up a rough incline with a kinetic energy of 200 joules. When the book comes momentarily to rest near the top of the incline, it has only gained 180 joules of gravitational potential energy. About how much kinetic energy will it have when it ...
May 10, 2012

Physics
A 1200-kg frictionless roller coaster starts from rest at a height of 24 m. What is its kinetic energy when it goes over a spot that is 12 m high?
May 10, 2012

Physics
You are driving your race car around a circular test track. Which would have a greater effect on the magnitude of your acceleration, doubling your speed or moving to a track with half the radius? Why?
May 10, 2012

international trade
wolrd
May 10, 2012

Physics
An Indy car with a speed of 120 km/h goes around a level, circular track with a radius of 1 km. What is the centripetal acceleration of the car (in m/s/s)?
May 10, 2012

Physics
An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?
May 10, 2012

Math
How to rewrite an expression with negative exponents such as : -12(3x-1)^-5 *(6x+7)^5 + 30(3x-1)^-4 *(6x+7)^4 common factor is 6 but what can I pull out from the (3x-1)^-5 and (3x-1)^-4 ?
May 9, 2012

Chemistry
what is it supposed to be?
May 9, 2012

Chemistry
i got it wrong... i got 1.22x10^-32. help!
May 9, 2012

Chemistry
The pressure of a gas is 35 atmospheres at a temperature of 48 (degrees) C with constant volume. What will the new pressure be if the temperature is increased to 36 (degrees) C?
May 9, 2012

Physics!!
The universal gravitational con- stant is 6.672 × 10−11 N m2/kg2. Objects with masses of 152 kg and 269 kg are separated by 0.45 m. A 53.5 kg mass is placed midway between them. Find the magnitude of the net gravitational force exerted by the larger masses on the ...
May 8, 2012

PHysics!!
Starting from rest at a height equal to the radius of the circular track, a block of mass 25 kg slides down a quarter circular track under the influence of gravity with friction present (of coefficient μ). The radius of the track is 15 m. The acceleration of gravity is 9....
May 8, 2012

Physics!!
A cart loaded with bricks has a total mass of 25.2 kg and is pulled at constant speed by a rope. The rope is inclined at 21.6 ◦ above the horizontal and the cart moves 13.7 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.4 . The ...
May 8, 2012

Health
11 letter word beginning with e for the process which alcohol leaves the body?
May 7, 2012

chemistry
Write the equation for the decomposition of HI, knowing that the reaction requires 9.4 kj/mol of hydrogen forming. If 100.0 kj of energy are added, how many grams of iodine will form.
May 6, 2012

Physics 121
Two block are connected by a rope that runs over a pulley. The block on the tables has mass 4kg, the hanging block has mass 2kg, and the pulley has mass 0.5kg and radius 0.25m. Assume that the table is friction-less. If the block are released from the rest, determine their ...
May 6, 2012

physics
A 10.67 kg bowling ball has speed 4.35 m/s before hitting the floor. A(n) 66.5 g golf ball flies at much higher speed, so the two balls have exactly same kinetic energy. What is the speed of the golf ball? Note: neglect rotation of either ball. Answer in units of m/s.
May 3, 2012

Physics
Given: The universal gravitational con- stant is 6.672 × 10−11 N m2/kg2. Objects with masses of 152 kg and 269 kg are separated by 0.45 m. A 53.5 kg mass is placed midway between them. Find the magnitude of the net gravitational force exerted by the larger masses ...
May 3, 2012

physics
A 10.67 kg bowling ball has speed 4.35 m/s before hitting the floor. A(n) 66.5 g golf ball flies at much higher speed, so the two balls have exactly same kinetic energy. What is the speed of the golf ball? Note: neglect rotation of either ball. Answer in units of m/s.
May 3, 2012

Physics
Given: The universal gravitational con- stant is 6.672 × 10−11 N m2/kg2. Objects with masses of 152 kg and 269 kg are separated by 0.45 m. A 53.5 kg mass is placed midway between them. Find the magnitude of the net gravitational force exerted by the larger masses ...
May 3, 2012

Physics
Given: The universal gravitational con- stant is 6.672 × 10−11 N m2/kg2. Objects with masses of 152 kg and 269 kg are separated by 0.45 m. A 53.5 kg mass is placed midway between them. Find the magnitude of the net gravitational force exerted by the larger masses ...
May 3, 2012

Physics
A ball is rolled off the flat roof of a 15-storey building that is 45 m above a playground. When will the ball strike the ground if you can ignore air resistance? If you believe that there is not enough information given, explain what is needed.
May 1, 2012

Physics
I would say they hit the ground at the same time but im not sure
May 1, 2012

Physics
Two identical balls roll off the edge of a horizontal table top. One leaves traveling at twice the speed of the other. Which ball hits the floor first? Why?
May 1, 2012

Physics
A baseball is hit with a horizontal speed of 22 m/s and a vertical speed of 14 m/s upward. What are these speeds 1 s later?
May 1, 2012

Physics
I would say the true mass is 60 kg and thats as far as i got
May 1, 2012

Physics
You stand on a bathroom scale that rests on the floor of an elevator. Standing on the scale compresses internal springs and activates a dial that indicates your weight in newtons. When the elevator is at rest, the scale reads 600 N. Then the elevator begins to move upward with...
May 1, 2012

math
Express the infinite series below using sigma notation and then find the sum. 64 + 40 + 25 + 15.625... Any explanation would be excellent. Thank you so much.
April 30, 2012

Physics
Tom Brady (the Patriots’ quarterback) throws a football – at a speed of 30 mph at an angle of 50 degrees to the horizontal – toward an intended receiver 20 yd straight downfield behind the goal-line. The pass is released 7.5 ft above the ground. Assume that the ...
April 29, 2012

Physics
A juggler has a set of balls that she can toss into the air. If it takes her 0.2 s to transfer a ball from the receiving hand to the launch hand and she is able to throw a given ball straight up with a maximum speed of 10 m/s how many balls can she successfully juggle at any ...
April 29, 2012

Physics
Thanks a lot Elena
April 29, 2012

Physics
Two friends are at the local high school track, a circle measuring 440 yards for one complete lap. Abe can jog at 8.2 miles per hour while Bob’s jogging speed is 4.6 miles per hour. If they both start at the same point and jog in the same direction (say clockwise), how ...
April 29, 2012

Marketing
What is the preparation of reports for each level of responsibility in the company’s organization chart called?
April 28, 2012

Marketing
Managerial accounting is
April 28, 2012

Math
Mr. Rainier's car uses about 1.6 fluid ounces of gas per minute when the engine is idling. One night, he parked his car but forgot to turn off the motor. He had just filled his tank. His tank holds 12 gallons. About how many hours will it take before his car runs out of gas?
April 25, 2012

chemistry
YES! it was the OH^- that messed up my calculation. The answer you provided me was correct, thanks for all the help!
April 24, 2012

chemistry
for the %protonation = [(OH^-)/(BN)]*100 i tried doing 1.15*10^-3 / 0.39 * 100 = .295, but the answer is incorrect. can you tell me what i did wrong?
April 24, 2012

chemistry
nvm, it IS right, ty xD
April 24, 2012

chemistry
-log ka=8.52 ka= 3*10^-09 Kb= kw/ka = 10^-14/ 3*10^-09 = 3.4 *10^-06 kb= x^2/0.39 x= squre root of ( 3.4*10^-6*0.39) =1.15*10^-3 POH= -log[OH-]= -logx= -log 1.15*10^-3 =2.939 PH= 14 - 2.939 =11.06 IS THIS RIGHT?
April 24, 2012

chemistry
Calculate the pH and percentage protonation of the solute in an aqueous solution of 0.39 M quinine if the pKa of its conjugate acid is 8.52.
April 24, 2012

english
Durig literacy analysis, the writer reads a work and then
April 23, 2012

math
tom had 8 pieces of pizza, tom ate one. How much is left
April 19, 2012

Grade 11 Math
Thanks that seems to have worked the back of my text book says it is 2.1 but i got 2.5 close enough.
April 18, 2012

Grade 11 Math
jackie mows a stip of uniform width around her 25m by 15m rectangular lawn and leaves a patch of lawn that is 60% of the original area. What is the width of the strip?
April 18, 2012

Networking
In your browser, you enter the URL of a website you use daily. After some delay, you receive a DNS error message that the host does not exist. a) What may have happened? Explain your reasoning. b) How would you logically disconfirm or test each possibility?
April 18, 2012

Networking
Assume that an average SNMP response message is 100 bytes long. Assume that a manager sends 40 SNMP Get commands each second. What percentage of a 128 kbps WAN link would the response message represent?
April 18, 2012

history
what event caused the greek city- states to put aside their differences.
April 16, 2012

physics
Two waves traveling on a string in the same direction both have a frequency of 100 Hz, a wavelength of 2cm and an amplitude of .02 m. What is the amplitude of the resultant wave if the original waves differ in phase (a) by Pi/6 and (b) by Pi/3
April 16, 2012

chem
Hey could you please help me. Why would K2CO3 be a better drying agent than Na2SO4 when drying out water from clohexanol?
April 15, 2012

Math
what is the median of the numbers 3,6,10,12,27,62
April 15, 2012

physics energy
A potential function is given by U(x) = 18 x^2. What will be the acceleration (in meters/second ^2) of a 8.00 kg mass, when it is at the position x = 0.500 m?
April 13, 2012

chemistry
What is the limiting reactant of 4000 grams of heptane is combusted with 7000 grams of oxygen?
April 13, 2012

Pre-calculus
Use the remainder theorem to find which of the following is not a factor of x3 + 12x2 + 47x + 60 the answer is x-5 but idk why
April 6, 2012

trig
simplify cox^2x-cos^4x
April 5, 2012

Chemistry
? lost- what chart?
April 5, 2012

Chemistry 2
(.032^2)x(.016^-1)^2 =4
April 5, 2012

Chemistry 2
i still dont get this
April 5, 2012

Mechanics for A-level
An object of mass 50kg rests on a rough plane inclined at an angle z to the horizontal. It is supported in this position by a light string parallel to the plane which is attached to the object and fixed to a point at the top of the plane. The string has a breaking strain of ...
April 5, 2012

finite math
Determine whether each system of linear equations has a)one and only one solution, b)infinitely many solutions, or c) no solution 2x-4y=5 3x +2y=6
April 3, 2012

physics
A uniform horizontal wire with a linear mass density of 0.48 g/m carries a 1.9 A current. It is placed in a constant magnetic field, with a strength of 3.5 10-3 T, that is horizontal and perpendicular to the wire. Neglect the magnetic field of the Earth. (a) As the wire moves ...
April 1, 2012

Mechanics (A level), Please help
Call the length of string below point B as h, then diagonal of triangle = a - h. angle to vertical of string = theta T + Tcostheta = W use pythagoras to find h (a - h)^2 = b^2 + h^2 so h = (a^2 - b^2)/2a and costheta = h/(a-h) = (a^2 - b^2) /(2a(a - [(a^2 - b^2)/2a] ) which ...
April 1, 2012

physics
A +5.7C X 10 to the -6 power point charge is on the x-axis at x=-3.0m,and a +2.0C X 10 to the -6 power point charge is on the x-axis at x=+1.0m.Determine the net electric field (magnitude and direction) on the y-axis at y=+2.0m.
March 30, 2012

Government
The Anti-federalists were against ratification of the constitution mostly because
March 29, 2012

science
Examine the obvious environmental impacts as well as significant social and physical ramifications of urban sprawl. What is the relationship between landscape and psychological well being? After defining this relationship, discuss how the presence or absence of natural beauty ...
March 29, 2012

science
Give examples of how humans have increased their food supply and what effects these methods have on the environment overall.
March 29, 2012

chemistry
how does the addition of a nonvolatile solute affect the vapor pressure of the solvent into which it is dissolved?
March 27, 2012

chemistry
2- A 0.310 M solution of a weak acid, HX, has a pH of 2.53 a. Find the [H+] and the percent ionization of nitrous acid in this solution. b. Write the equilibrium expression and calculate the value of Ka for the weak acid. c. Calculate the pH of the solution formed by adding 10...
March 25, 2012

chemistry
thank you!
March 25, 2012

Chemistry
need more help
March 25, 2012

Chemistry
need more help
March 25, 2012

math
The space station is going 17500 mph as it orbits the earth. How long will it take to orbit 1 time if the earths diameter is 7926 miles and the space station orbits at 240 miles above the earth.
March 25, 2012

Science
How many milliliters of water at 20.0 °C are formed in the combustion of 25.0 g of a methanol–propanol mixture that is 62.5% methanol by mass? Assume there is an excess of oxygen available.
March 22, 2012

chemistry
120.g NO
March 21, 2012

chemistry
How man grams of nitrogen monoxide are needed to react with adequate oxygen to produce 89.6 L of nitrogen dioxide
March 21, 2012

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