Wednesday
April 16, 2014

Posts by Joe


Total # Posts: 1,998

PHYSICS
m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended....

Math
Steve bought 300 shares stock for x dollars per share in 2008. This year he sold the stock for y dollars per share where y<x.He lost on the transaction. is wife Lisa used the formula (y-x)/x to compare the percent of loss. Steve said Lisa was incorrect because she didn'...

math
3

math
a phone company wants to create some new area codes. each area code will be 3 numbers . using the digits 1,5,and 7 only once in each code, how many codes can the phone company create?

Chem
In a coffee cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) -----------------> AgCl (s) The two solutions were initially at 22.60 °C, and the final temperature is 23.40 °C. Calculate...

physicss help!
m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended....

physics
m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended....

probability
carlos shoots a free throw in basketball, what are the chances of making a basket?

Algebra
84

Math
a=35 s=50

help! physics
it doesnt work can u help me?

help! physics
A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How do you find the for...

physics
ive been trying that but it doesnt work. for the force i get 4.96 and i find the work with that and its always wrong.

physics
ive been trying that but it doesnt work. for the force i get 4.96 and i find the work with that and its always wrong.

physics
A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How do you find the force?

alberga
60*6 DUH!

biology
what is the promoter sequence for transcription? in regards to nucleotides

biology
list two types of active transport that use specific protein recognition

math
5.06 and 5.94

comm 100
if you use literal analogies

algebra
The volume of a pyramid with a rectangular base is V= 1/3 x LWH Find W if V = 500, L = 15, and H = 4.

physics
there is a massless rope that is pulled over a frictionless pulley that is suspended high above the ground one end of the rope is tied to a heavy block with a mass of 483 kg the free end is climbed by a person with a mass of 102 kg who starts from rest. If during the time of t...

physics
At a track-and-field meet, the best long jump is measured as 8.00 m. The jumper took off at an angle of 46° to the horizontal. (a) What was the jumper’s initial speed? (Neglect air resistance.) 1 m/s (b) If there were another meet on the Moon and the same jumper could...

Physics
A car starts from rest and accelerates unifomly at 3m/s^2. A second car starts from rest 6 seconds later at the same point and accelerates uniformly at 5m/s^2. How long does it take the second car to over take the first car?

chemistry
S is Positive

Chemistry
What mass of NaCl is needed to precipitate all the silver ions from 20.0 mL of 0.100 M AgNO3 solution?

geometry
in the diagram below of triangle abc, de is a midsegment of triangle abc, de=7, ab=10, and bc=13.find the perimeter

Science
how much heat is required to change 5 grams of iron to 10c

physics
Mars has a mass of about 6.8 × 1023 kg, and its moon Phobos has a mass of about 9.5 × 1015 kg. If the magnitude of the gravitational force between the two bodies is 4.66 × 1015 N, how far apart are Mars and Phobos?

Math (Translate each sentance into a equation)
the product of Mike's age and 4 is 52

physics
ham

CIS 115
Can someone post an actual answer to this question either with paint or visual logic please?

trig
evaluate the expression below at t=4 p=$400 and r=-9% round youre answer 2 decimal place

ochem
at room temperature is caffeine soluble in water or dichloromethane

Calculus
If f(x)=[(x−1)/(1+5x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.

science
Tight junctions prevent the movement of the extracellular matrix between cells. A) True B) False Which one is it please :)

science
Tight junctions prevent the movement of the extracellular matrix between cells. A) True B) False Which one is it please :)

calculus
Piecewise f(x) = { (x^2, x<=2) (mx + b, x>2) I am not sure what the graph would look like for the 2nd function. Any tips on drawing functions like this would be of great help.

Statistics
what is the answer

chemistry
A foundry releases 6.0 tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO2) by wieght. How many pounds of SO2 are released in one week?

Physics
A 1596 kg car traveling at 24.91 m/s skids to a halt. What is the change in the combined thermal energy of the car and the road surface?

Physics
A 1596 kg car traveling at 24.91 m/s skids to a halt. What is the change in the combined thermal energy of the car and the road surface?

Physics
A 50 g ice cube can slide without friction up and down a 32° slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10.16 cm. The spring constant is 22 N/m. When the ice cube is released, what distance will it travel up the slope...

Physics
A 50 g ice cube can slide without friction up and down a 32° slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10.16 cm. The spring constant is 22 N/m. When the ice cube is released, what distance will it travel up the slope...

math
i need the right answer

math
what is 2+2 equal to?

Math 124
There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!! You cannot have commas in numbers. You cannot have a space in a number. You cannot substitute the letter O for zero or the l...

physics
Use kinematics to find the time it will take the rock to fall to the ground. (delta)x = V(initial)(time) + .5at^2 (delta)x = 0 + .5(-9.8)t^2 First term drops out because initial velocity is zero. Acceleration is that due to gravity. Negative sign is because it is accelerating ...

AP Physics
By Snell's law, n(incident)sin(theta(incident)) = n(refracted)sin(theta(refracted)) or n(1)sin(theta(1)) = n(2)sin(theta(2)) Solving for theta(2) sin(theta(2)) = [n(1)sin(theta(1))]/n(2) Theta(2) = arcsin [n(1)sin(theta(1))]/n(2) Theta(2) = arcsin ((1)(sin(33.5))/1.33 or w...

physics
some massive butt mud

math
john's high score on the asteroid game was 326,700. mike's high score was 418,200. rebecca just plated the game and her high score was halfway between john's and mike's. what was rebecca's score?

Spanish-another question please
Thank you for all your help

Spanish-another question please
1.If I had a picture of a family having fun in the snow-I'm not sure how to say that-- a.La familia divertirse en la nieve b.La familia se divertir en la nieve c.La familia diviertese en la nieve d.La familia se divierte en la nieve I think it is (a) 2. If a muchacho is lo...

Spanish
Could you please check these -thank you 1.How do you say I am going to wake up early I think it is "Yo me voy a despertar temprano" 2. What is another way of saying "Voy a secarme el pelo. Is it "Me voy a secar el pello.

Physics
The acceleration due to gravity on the moon is about one sixth its value on earth. If a baseball reaches a height of 62 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m

algebra
you rent a car for $55.00 a day. .20 cents a mile , and you pay $80.00 at the end of the day. how many miles did you drive

statistics
You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.8. With water it will die with probability 0.4. You are 87 % certain the neighbor will remember to water the plant. You come back from the vacation and the...

Physics
A ball is thrown straight up and rises to a maximum height of 24 m above the ground. At what height is the speed of the ball equal to half of its initial value? Assume that the ball starts at a height of 1.9 m above the ground.

math riddles for 7th grade
turdy truck

Chem 151
23, 54

Chem
A mass spectrum of phosporus atoms shows only a single peak at a mass of 31 what can you conclude from this observation?

psycology
nisa has grown up in a small villegein the foothills. There was no electricity and water had to be hand pumped.they seldom saw people from the outside.when she entered school the bus had to pick her up

Chemistry
Beryllium Chromate Pentahydrate

Chemistry
Use Boyles law P1V1 = P2V2 Answer 112 kPa (850)(x)=(1700)(56) <--- Equation

chemistry (please help)
Use density to find the mass Density * Volume = Mass of Coolant Make sure to convert 26.5 to ml or take 1.11 g/ml to 1.11 g/L.

algebra 1
Not DISTRIBUTE BUT ADD

algebra 1
Distribute the 5 9+105x

Math
Fair Coins*

Math
1. When four fan coins are flipped what is the probability of getting either exactly two heads of exactly two tails? 2. Solve for x 3x-x√3=-6 3. In the figure below ABCD is a rectangle and DE=DC. Given Ad= 5 and BE=3 find DE Thanks!

Bio
How much NaC3H5O3 (in grams) is needed to create a 1000 ml volume of Ringer’s lactate solution?

arithmetic
What is the sum of the arithmetic sequence 22, 13, 4 … if there are 28 terms?

algebra
select T.branch_name from branch T, branch S where T.assets > S.assets and S.branch_city = "Brooklyn" Write an efficient relational algebra expression that is equivalent to this above query. Here is my answer: á T.branch_name (T.assets > S.assets v S.br...

math
select T.branch_name from branch T, branch S where T.assets > S.assets and S.branch_city = "Brooklyn" Write an efficient relational algebra expression that is equivalent to this query. Here is my answer: á T.branch_name (T.assets > S.assets v S.branch_ci...

Physics
A dog runs 50 m 30¢ª south of east and then turns and runs 75 m 45¢ª north of east. Determine the dog's resultant displacement

English
What is the meaning of validity, truth, and soundness as they relate to logical syllogisms

physics
9.4

Math
An angle θ, in standard position, has its terminal side in Quadrant IV on the line 12x + 5y = 0. Find the exact values of sin θ and cos θ.

math
write an inequality for the p (in dollars)described. Price start at $12.99

math
Suppose you have a 64 gigabyte flash storage system, with a 4096 byte page size. How big would the flash translation table be, assuming each page has a 32 bit address, and the table is stored as an array. I think the answer is 20 pages, does that sound about right?

Math
Can you get an answer?

Math
Find the quotient a^2x^3 + (5a^2b+ab)x^2 + (ab^3+5ab^2)x + b^4 divided by ax + b ^ symbolize power so a^2x^3 means a squared times x cubed.

math
I know its hard to see, but the triangle looks like this /_| with the legs on the right and bottom with the hypotenuse on the left. They give you y for the right leg and x for the bottom leg, no hypotneuse. o is the bottom right angle and a is the top right angle. So I dont kn...

math
Given the triangle shown, describe the function values in term of hte triangle's two legs /| /a| y / | /o__| x Find: sec a Find: csc o

statistics
In a preliminary study, the sample standard deviation for the duration of a particular back pain suffered by patients was 18.0 months. How large a random sample is needed to construct a 90% confidence interval so that an estimate can be made within 2 months of the actual duratio

PreCalc - Sequence
A ball is dropped from a height of 20 ft and always rebounds 1/4 of the distance fallen. A. write a sequence for the first 3 rebound heights B. How high is the 6th rebound? C. Find the sum of all possible rebounds. I keep getting numbers that are too high. I don't think I ...

math
X+(1/6)=(1/3) get X by itself by subtracting 1/6th from both sides. x(+1/6)-(1/6)=(1/3)-(1/6) x=(1/3)-(1/6) x=(1/6) These operations of getting the variable(s) on one side will be the basis of many of your future calculations as you progress through mathematics.

math
help solve x + 1/6= 1/3 thanks

math
solve by substitution method. 5m+n=36 m-5n=54 the everton college store paid 1,859.00 for an order of 49 caculators the store paid 11.00 for each scientific calculator. the others ,all graphing caculators, cost the store 55.00 each. how many of each type of caculators was orde...

Pre Cal/Vectors
Can someone show the steps involved in figuring out this type of problem? Given the magnitudes of vectors u and v and the angle Ό between them, find the magnitude of the sum u + v to the nearest tenth and the angle that the sum vector makes with u to the nearest degree. /...

Vectors
If /U/=9, /V/=11, and theta = 43 deg (angle between), find the magnitude of U+V and give the direction that the that the resultant makes with U.

structured query language math
Display a list of all instructors, showing their ID, name, and the number of sections that they have taught. Make sure to show the number of sections as 0 for instructors who have not taught any section. Your query should use an outerjoin, and should not use scalar subqueries....

math write in sql
Display the list of all departments, with the total number of instructors in each department, without using scalar subqueries. make sure to correctly handle departments with no instructors. Is this the right answer: select department.dept_name from department natural left oute...

math write in sql
I have this question i need to know how to do for a test coming up this week. a)Display the list of all course sections offered in Spring 2010, along with the names of the instructors teaching the section. If a section has more than one instructor, it should appear as many tim...

SQL
Im am running oracle. Here is what i have for the first query:select ID, name, from instructor natural left outer join section where sec_id >= 0.

SQL
This is a practice problem that the book has no answer for and needed to see how these two problems are done so i can be prepared for a test next week. The both need to be written in structured query langauge.

SQL
Display a list of all instructors, showing their ID, name, and the number of sections that they have taught. Make sure to show the number of sections as 0 for instructors who have not taught any section. Your query should use an outerjoin, and should not use scalar subqueries....

trig
Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is Sin2Theta = -.7255970691 and cos2theta = 1.632455533

Pre-Calculus
Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is 1.632455533

Calculus
positive 5.47

Calculus
-13.67?? ...

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