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October 24, 2014

Posts by Andrew


Total # Posts: 978

Physics
A bullet moving at a speed of 154 m/s passes through a plank of wood. After passing through the plank, its speed is 149 m/s. Another bullet, of the same mass and size but moving at 91 m/s, passes through an identical plank. What will this second bullet's speed be after ...
January 23, 2013

Physics
This is for physics class. Sally applies 32 N of force at an angle of 22 degrees above the horizontal to a 12 kg crate. Ignoring friction, calculate the horizontal acceleration of the crate? Conceptual: will the acceleration of the crate increase or decrease if the same force ...
January 17, 2013

Science
This picture explains it pretty well. heathcotebl.wikispaces.███/file/view/f20-2a_negative_feedbac_c.jpg/294177878/f20-2a_negative_feedbac_c.jpg replace the ███ with .c0m without the 0
January 17, 2013

Physics
Find the magnitude of the x and y components of the following vector: ----------------- \ 35 degrees \ 52 N \ \ I also have to find out which of the components is negative in direction.
January 17, 2013

Algebra
Is the series 72, 48, 32,... an arithmetic or geometric series. WHat is common difference or ratio
January 17, 2013

Math (intergrated algebra)
What's is the volume of a cylinder when the diameter is 14 inches & the height is 5 inches
January 7, 2013

Math
The dimensions of Mrs. Singleton's square garden are dilated using a scale factor of 3. What is the relationship between the area of the new garden and the old garden? A. The are of the new garden is nine times the area of the original garden B. The area of the new garden ...
January 7, 2013

Math
Craftsmen install 500 sq ft of ceramic tile and 100 sq ft of vinyl tile in one day. An apprentice installs 100 sq ft of ceramic tile and 200 sq ft of vinyl tile in one day. The firm has a job that requires 2000 sq ft of ceramic tile and 1600 sq ft of vinyl tile. Tessa pays ...
December 7, 2012

Math
Craftsmen install 500 sq ft of ceramic tile and 100 sq ft of vinyl tile in one day. An apprentice installs 100 sq ft of ceramic tile and 200 sq ft of vinyl tile in one day. The firm has a job that requires 2000 sq ft of ceramic tile and 1600 sq ft of vinyl tile. Tessa pays ...
December 6, 2012

Math
Craftsmen install 500 sq ft of ceramic tile and 100 sq ft of vinyl tile in one day. An apprentice installs 100 sq ft of ceramic tile and 200 sq ft of vinyl tile in one day. The firm has a job that requires 2000 sq ft of ceramic tile and 1600 sq ft of vinyl tile. Tessa pays ...
December 6, 2012

Physics
A satellite is orbiting the earth at a distance of 1.00 x 10^3 km. What is its speed?
November 28, 2012

Math
If you get a confidence interval of (42,58) what is your margin of error?
November 27, 2012

Classifyng triangles
Tell wether the statement is always, so Etimes, or never true. Justify your reasoning and i clude example .The sum of any two angle measures in an acute triangle is greater than 90 degree.
November 26, 2012

math
A pair of dice are rolled find the following, a) the probability of doubles, b) the odds in favor of a sum greater than 2, c) the probability of sum that is even and less than 5
November 26, 2012

math
Two cards are drawn without replacement from a standard deck of 52 cards. Find the probability a) both cards are red ,b) both cards are the same color, c) the second card is a king given that the first card is a queen, d) the second card is the queen of hearts given that the ...
November 26, 2012

math
Two cards are drawn without replacement from a standard deck of 52 cards. Find the probability a) both cards are red ,b) both cards are the same color, c) the second card is a king given that the first card is a queen, d) the second card is the queen of hearts given that the ...
November 26, 2012

mechanics
two bodies of mass m1 and m2 are attached to two ends of a string which passes over a massless and frictionless pulley. find the acceleration of the bodies and the tension of the string. m1 is bigger than m2
November 22, 2012

math
for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=20,p=1/8, x=2 I know the answer but I do not know how to get to that. Answer is 0.268 should I reduce fraction?
November 20, 2012

math
for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=5,p=1/3, x=4
November 20, 2012

math
Beth Dahlke is taking a ten question multiple choice test for which each question has three answer choice only one of which is correct. Beth decides on answers by rolling a fair die and making the first answer choice if the die shows 1 or 2 the second if it showes 3 or 4 and ...
November 20, 2012

math
for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=5,p=1/3, x=4
November 20, 2012

math
A game show contestant is offered the option of receiving a computer system worth $2300 or accepting a chance to win either a luxary vacation worth $5000 ora boat worth $8000.If the second option is chosen the contestant"s probability of winning the vacation or the boat ...
November 19, 2012

Physics
Suppose a 47-N sled is resting on packed snow. The coefficient of kinetic friction is 0.14. If a person weighing 670 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?
November 17, 2012

math
Therese Felser manages a grocery warehouse which encourages volume shopping on the part of its customers. Therese has discovered that, on any given weekday 70 percent of the customer sales amount to more than $ 100. That is any given sale on such a day has a probability of 0....
November 17, 2012

math
Therese Felser manages a grocery warehouse which encourages volume shopping on the part of its customers. Therese has discovered that, on any given weekday 70 percent of the customer sales amount to more than $ 100. That is any given sale on such a day has a probability of 0....
November 17, 2012

math
Therese Felser manages a grocery warehouse which encourages volume shopping on the part of its customers. Therese has discovered that, on any given weekday 70 percent of the customer sales amount to more than $ 100. That is any given sale on such a day has a probability of 0....
November 16, 2012

math
Therese Felser manages a grocery warehouse which encourages volume shopping on the part of its customers. Therese has discovered that, on any given weekday 70 percent of the customer sales amount to more than $ 100. That is any given sale on such a day has a probability of 0....
November 16, 2012

math
Assuming boy and girl babies are equally likely, find the probability that it would take a) at least three births to obtain two girls b) at least four births to obtain two girls c) at least five births to obtain two girls
November 16, 2012

math
Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. All the women will be interviewed first. No man will be interviewed until at least two women have been interviewed
November 16, 2012

math
Assuming boy and girl babies are equally likely, find the probability that it would take a) at least three births to obtain two girls b) at least four births to obtain two girls c) at least five births to obtain two girls
November 15, 2012

math
Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. All the women will be interviewed first. No man will be interviewed until at least two women have been interviewed.
November 15, 2012

math
One problem encountered by developers of the space shuttle program is air pollution in the area surronding the launch site. Acertain direction from the launch site is considered critical in terms of hydrogen chloride pollution from the exhaust cloud. It has been determined ...
November 15, 2012

math
Therese Felser manages a grocery warehouse which encourages volume shopping on the part of its customers. Therese has discovered that, on any given weekday 70 percent of the customer sales amount to more than $ 100. That is any given sale on such a day has a probability of 0....
November 15, 2012

math
if only digits 0,1,2,3,4,5,6, and 7 may be used find number of possibilites four digit numbers
November 14, 2012

math
given the digits 0,1,2,3,4,5,6, and 7 find the number of possibilities in each category four digit numbers, odd three digit numbers and three digit numbers without repeating digits.
November 14, 2012

Physics Resistance
this didnt seem to work. do the voltmeter and resistor have to be treated as a parallel connection?
November 11, 2012

Physics Resistance
A 65 V. battery is connected across a 65400 ohm and a 37700 ohm resistor connected in series. What is the per cent error in the voltmeter reading when placed across the first resistor, if the voltmeter resistance is 143000 ohms? Not sure where to go with this problem, Its easy...
November 11, 2012

MAT 116
oh drats non-linear is so much more fun! where x is length and y is width. 2x + 2y = 28 x - 10 = y solve with substitution
November 11, 2012

Its math, cmon answer!!!
cmon its 2
November 11, 2012

Physics RC
A 6.44 E+06 ohm resistor and a 1.00 microfarad capacitor are connected in a single loop circuit with a seat of emf of E = 2.00 V. At 6.00 s. after the connection is made, what is the rate at which energy (in joules/second) is being delivered by the seat of emf?
November 11, 2012

Physics
A 6.44 E+06 ohm resistor and a 1.00 microfarad capacitor are connected in a single loop circuit with a seat of emf of E = 2.00 V. At 6.00 s. after the connection is made, what is the rate at which energy (in joules/second) is being delivered by the seat of emf?
November 10, 2012

physics
Here's my attempt. V = 324.8 m^3 Total Energy of Students: 395280 J (in 54min) mass = 406kg q=mc(deltaT) q= 395280J c= 840 J/kg C m= 406 kg delta T = 1.16 C Tf = 20.0 C
November 10, 2012

chemistry
its C your original answer
November 10, 2012

chemistry
indeed
November 10, 2012

chemistry
Think a little more.. you have 1.25e23 atoms, and there are 6.02e23 atom in one mole. dividing the first by the second yields 2.08e-1 mol Mg
November 10, 2012

Physics
ive previously tried this and obtained 3.34e-13 m/s which the computer says is wrong where N = 8.46e28 m^-3 e = 1.6e-19 C and A = 7.07e-8 m^2
November 10, 2012

Physics
A small but measurable current of 3.20 E-10 A. exists in a copper wire whose diameter is 0.03 cm. Calculate the electron drift speed (in meters/second).
November 10, 2012

chemistry
you think correctly
November 10, 2012

math
denominator is the number beneath the line of a fraction. e.g. x/4 we know that 1/4 wont work, neither will 2/4 (1/2) nor 4/4 (1). That leaves us with one option 3/4 3/4 is greater than 1/2 but less than 1 and has a 4 in the denominator Hope that helps!
November 10, 2012

chemistry
you have the correct answer and are looking for an explanation? there are three nitrates of formula NO3. since there are 3 oxygen atoms per nitrate, and 3 nitrates total. 3x3 = 9 oxygen atoms per nitroglycerin
November 10, 2012

biology
d = m/v v = 5.18^3 m = 197g d = 197/(5.18^3) answer is in g/cm^3
November 10, 2012

nuclear chemistry
E=mc^2 10^6 J/s are being produced (1Mw) 10^6 J/s = m (3.0e8 m/s) solve for mass to find amount of mass lost in one second. ~ .0033kg
November 10, 2012

Physics deflection ammeter
thank you bob!
November 10, 2012

Physics deflection ammeter
8. A galvanometer has a coil resistance of 100 ohms and gives a full scale deflection when the potential difference across it is 0.0002 V. What size resistor (with a value measured in ohms) is required to make a 1.0 A. full scale deflection ammeter?
November 10, 2012

Capacitor
A parallel plate capacitor with plates of area 320 cm.^2 is charged to a potential difference V and is then disconnected from the voltage source. When the plates are moved 0.3 cm. farther apart, the voltage between the plates is increased by 152 V. What is the charge on the ...
November 4, 2012

Capacitance
A parallel plate capacitor with plates of area 320 cm.^2 is charged to a potential difference V and is then disconnected from the voltage source. When the plates are moved 0.3 cm. farther apart, the voltage between the plates is increased by 152 V. What is the charge on the ...
November 3, 2012

Chemistry
Tiffany, Assuming the reaction runs to completion and there is an excess of Al you know that Bromine is your limiting reagent. Stoichiometry will give you the amount of AlBr2 produced. You begin with 7.9 mol Br2 to cancel the moles of Bromine and find moles of Aluminum Bromide...
November 3, 2012

Capacitance (tricky)
Thanks! Our textbook did not cover dielectrics very well.
November 3, 2012

Capacitance (tricky)
Two parallel plates of area 41 cm.^2 have equal but opposite charges of 2.60E-07 C. Within the dielectric material filling the space between the plates, the electric field is 5.80E+05 V./m. Find the dielectric constant of the material. Feel like there is a huge lack of ...
November 3, 2012

physics
Alyssa, I suggest you draw a freebody diagram of the wagon and the handle. Youll notice that the handle has a force of magnitude 20N with a direction of 25 degrees above the horizontal. Now write your force summation using Newton's second law. Let Ft be the magnitude of ...
November 3, 2012

John Jay
what is sum or defference of 3/8 + 3/5
October 26, 2012

calculus
(a) Find the number c such that the limit below exists. Limit as x goes to -2 of: x^2+cx=c-3/x^2+2x (b) Calculate the limit for the value of c in part (a).
October 24, 2012

math
2 half dollars, 4 quarters, 2 dimes and 1 penny .50+.50+.25+.25+.25+.25+.10+.10+.01=2.21 2+4+2+1=9
October 24, 2012

Math
(a) Find the number c such that the limit below exists. Limit as x goes to -2 of: x^2+cx=c-3/x^2+2x (b) Calculate the limit for the value of c in part (a).
October 24, 2012

Physics Conducting Spheres
1. Two concentric conducting spherical shells have radii of 0.145 m. and 0.215 m. The inner sphere bears a charge of -3.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum, compute the speed (in ...
October 21, 2012

physics
c)what is the balls speed just after the bounce?
October 11, 2012

physics
You drop a ball from a height of 1.9m , and it bounces back to a height of 1.3m . a)What fraction of its initial energy is lost during the bounce? b)What is the ball's speed just before the bounce?
October 11, 2012

Physics
Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 15.7 m/s, directed 52° below the horizontal. What initial velocity did you give them?
September 20, 2012

Physics
Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 15.7 m/s, directed 52° below the horizontal. What initial velocity did you give them?
September 20, 2012

Physics
What is the speed of the rocket when it is 350 above the surface of the earth? A rocket starts from rest and moves upward from the surface of the earth. For the first 10 of its motion, the vertical acceleration of the rocket is given by a(y)=2.9, where the -direction y+ is ...
September 9, 2012

Physics
A 160lb person steps into an elevator and stands on a bathroom scale. what is the weight on the scale when the elevator accelerates upwards at 2ft/s^2
August 26, 2012

chemistry
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance
August 22, 2012

calculus
f(x)=[lnx]^5
July 19, 2012

physics, please help me, this question is hard
John Stands at the edge of a flat roof of a three story building and throws a 180g ball straight up into the air that reaches a height of 3.0 meters above the roof. ( building is 14 meters high) A. What is the initial speed of the ball? B. How long does it take to reach it'...
July 5, 2012

help please :)
yeah write teacher you are extremely rude get some manners
June 19, 2012

Chemistry
For 105ml of a buffer that is .40 M in HOCL and .36M in NaOCL what is the pH after 13.4 ml of 1.5M NaOH is added? Ka for HOCL is 3.5x10^-8
June 12, 2012

Chemistry
Alright, I got it thanks!
June 4, 2012

Chemistry
I'm messing up somewhere 1x10^30= [.011-x]/[x][.836+4x]^4 4.8x10^29(x)+2.56x10^32(x^5)=.011-x Factoring out an x and moving all terms x(4.8x10^29+2.56x10^32(x^4))-.011+x=0 Then because of the relative size I assumed -.011 and x are negligible x(4.8x10^29+2.56x10^32(x^4))=0...
June 4, 2012

Chemistry
What is the concentration of Hg^2+ in 500.0 mL of a solution that was originally 0.011 M Hg^2+ and had 73 g of KI added to it? Hg^2+(aq) + 4I^-(aq)<=> HgI4^2-(aq) The overall formation constant is 1x10^30
June 4, 2012

physics
A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of Sr is 89.9077 u.) If the building initially contained 4.8 kg of this substance and the safe level is less than 10.0 counts/min, ...
June 3, 2012

physics
After 1.84 days, the activity of a sample of an unknown type radioactive material has decreased to 85.8% of the initial activity. What is the half-life of this material? (in days)
June 3, 2012

Chemistry
Alright, I was able to figure them all out. Thank you!
June 1, 2012

Chemistry
So for the first portion I came to Kb=1.5x10^-10 then x^2/.14-x= 1.56x10^-10 x^2-(2.2x10^-11)x - 1.56x10^-10=0 solving with the quadratic equation I came to x= 1.25x10^-5 (I'm disregarding i) So -log(1.25x10^-5)= 4.9 But somewhere I've done something wrong as the ...
June 1, 2012

Chemistry
Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.14 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.14 M NaOH halfway point equivalence point (b) 100.0 mL of 0.29 M C2H5NH2 (Kb = 5.6 multiplied by ...
June 1, 2012

science
Its C...Nodules of certain plants such as clover fix Nitrogen to the soil...thats the reason farmers grow cver ...then plow it back into the soil..Natural source of Nitrogen...dontknow about the others...
May 31, 2012

Introduction to Psychology
way too much time on phone...in the shower..and on Facebook..:)
May 31, 2012

Math
Add it up...here goes..6 X $9.80...plus 1/4 hour =15 mins...so work out 1/4 of $9.80...remember 1/4 = 25%....then 7 x $14.50...plus 30 mins at $14.50/hr...remember 30 mins is 1/2 an hour so whats $14.50 divided by two..?...now add it all up and theres you answer...!
May 31, 2012

Art
Spanish Romanticism...not sure about any other....its oil on canvas (1820)
May 30, 2012

math
11,,,,,,!!!!
May 29, 2012

math
3y-12=21
May 29, 2012

math
It says Complete 10/3 on maths homework...what does this mean...thanks.. :)
May 29, 2012

chemistry
Its c....K= potassium...and there is is only one mentioned...and Cl= chlorine...again only one mentioned.. So its C...look up your elements table and it will tell you what K..is etc...then you wont have to send as many questions in...!!
May 28, 2012

chemistry
Its D..!!...the 2 after the Br means its attached to that element..so read as 2 X Br....there is nothing after the Mg...so that means there ais only one So therefore its D...
May 28, 2012

Minoxidil
C9H15N2O...chemical formula
May 28, 2012

Minoxidil
Try under its more common name "Rogaine"...its basically a chemical that slows hair loss....
May 28, 2012

Religion
Its Islam = Peace
May 28, 2012

Physics
A convex lens forms a real image 6 times the size of the object. The distance between object and image is 33 cm. Find the focal length of the lens.
May 28, 2012

physics
An object is placed 75.0 cm from a screen. (a)Where should a converging lens of focal length 8.0 cm be placed to form an image on the screen? shorter distance __cm from the screen farther distance __cm from the screen (b)Find the magnification of the lens. magnification if ...
May 23, 2012

Chemistry
Find [H+] [OH-] and Ph
May 21, 2012

Chemistry
A solution is prepared by adding 47.3 mL of concentrated hydrochloric acid and 16.3 mL of concentrated nitric acid to 300 mL of water. More water is added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution. [Hint: Concentrated HCl is 38% HCl...
May 21, 2012

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