Saturday
July 26, 2014

Posts by John


Total # Posts: 6,193

chemistry
Calculate the amount of heat required to heat a 3.7{\rm kg} gold bar from 30^\circ {\rm C} to 61^\circ {\rm C}. Specific heat capacity of gold is 0.128 \rm J/g ^\circ C

physics
A train is moving parallel and adjacent to a highway with a constant speed of 25 m/s. Initially a car is 49 meters behind the train travelling in the same directionas the train at 37 m/s and accelerating at 4 m/s^2. What is the speed of the car just as it passes the train.

physics
A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0º below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert...

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (0, infinity).

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (o, infinity).

Probability and statistics
how much will the squirrel expect to have

Math
Please help I have no Idea what to do here. A box with an open top is to be constructed by cutting a-inch squares from the corners of a rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 420 in^3 when a = 3?

math
12p - 3 - 17p + 42

math/trig
A flagpole casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?

math/trig
A 16 ft ladder casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?

Math
Rounded to the nearest 10 I am 12750

algebra
hey i was wondering if u could tell me the right answer to this problem..ty the product of 2 and the sum of 5 and k i think its either 2(5+k) or 2x(5+k)

calculus *astroid*
Everything is so easy once you know how to work around it! Thanks again Steve.

calculus *astroid*
THe equation x^2/3 + y^2/3 = 4 describes an astroid. Determine the length of the astroid by finding the length of a portion of it,found in the first quadrant, being y = (4-x^2/3)^3/2 for 0<x<8 and multiplying that valor by 4.

calculus *improper integrals*
I see how it makes sense now, thanks a lot Steve!

calculus *improper integrals*
yes , the hole goes through the sphere, centered along the diameter

calculus *improper integrals*
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...

college algebra
to travel 132 miles it take sue riding a moped 2 hours less time then it takes doreen to travel 56 miles riding a bike. sue travels 15 miles per hour faster then doreen find the time and rates

Chemistry
I've tried to solve this question multiple ways I just can't seem to get it. I just don't understand what I should be doing. An organic liquid is a mixture of methyl alcohol () and ethyl alcohol (). A 0.220- sample of the liquid is burned in an excess of and yields...

Chem
what is the pH of solution made by mixing 100 mL of 0.030M HCL with 200 mL water?

calculus
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...

PHYSICS
The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?

English - Early American Lit (NEED ASAP)
Yeah I looked them up for number 2. That's why's B. Have you looked up the titles for number 2?! So... pretty much you commenting told me nothing I didn't knw already. I didn't ask for links. I asked for letters... like A,B,C,D.. it's our alphabet if you di...

English - Early American Lit (NEED ASAP)
2. B

English - Early American Lit (NEED ASAP)
My answers so far: 1.A 2.C Not sure if they are correct

math
complete the tables so that the ratios are equivalent i don't understand 10 | | 27 40 | 36 | 54 | 72

physics
An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 53800 m/s to a speed of 4.58 × 106 m/s in a distance of 2.82 cm. What is its acceleration? Answer in units of m/s2

Science
How many mL of 80% v/v ethanol do you need to make 200 mL of a 50% ethanol solution in water?

math
eddie is thinking of a number between 149,000 and 150,000 his number has a tens digit that is 7 more than its ones digit. The sum of the tens and ones digit is 9 the sum. the hundreds digit is 0 what is eddies number

Science
How may 1.5 Liter water capacity diving cylinders can I fill to 200 bar from a 50 liter water capacity storage cylinder filled to 200 bar,leaving 25 bar in the storage cylinder, using a booster pump?

chem
Hint: Remember that reactions happen in moles. So figure out the moles that reacted then use the molarity formula to continue solving the problem. What volume of 0.699 M K3PO4 is required to react with 68 mL of 0.661 MMgCl2 accord- ing to the equation 2K3PO4 + 3MgCl2 ! Mg3(PO4...

JOB CORP
Monotheism, a religious doctrine that recognizes a single supreme god, first arose in Southwest Asia around _________ BC

chemistry
109 mmHg

math
if the reciprocal of the opposite of a number, x, is equal to 9 times the opoostie of the number, then the number could be?

math
a=7-3a. for example 2=7-3(2)=1. if 6-x=2-x, find the value of x. the problem i am having is that the first a is in a square box and the first 2 is in a squre box. so does 6 and -x in a square box. I am not sure what the boxes represent?

math
In bowling, a handicap is determined by subtracting your bowling average from 180 and then finding 80% of this difference. Freddie bowls games of 178, 156, 149, 155, 172 and 180. Freddie's handicap is__________. I came up with 12. Could you check if this is correct please?...

math
what if the options are 4, 16, 25, 36, 64. How would the answer is going to change? I think the answer is 64. could you tell me if the 64 is the right answer?

math
could you explain to me how to solve it please?

math
If a cube is sliced into equal sized smaller cubes, which quantity of smaller cubes could be attained? a)4 b)16 c)1/4 d)-1/5 e)1

math
thank you!!

math
4'x4'x8'

math
a cordof wood stacked as a rectangular solid measures 4"x4"x8". How many cubic feet are in 3/4 this fo a cord?

Science
what is the atomic symbol for the element chronium

Physics / Chemistry
For a small molecule with a diffusion coefficient of 10^-6 cm2/s, how far would it diffuse after flowing over 1 cm at a flow rate of 10 cm/s?

John
For a small molecule with a diffusion coefficient of 10^-6 cm2/s, how far would it diffuse after flowing over 1 cm at a flow rate of 10 cm/s?

Business and math question
I REALLY DON'T KNOW

Business and math question
Isabella is hoping to get an A on her college algebra course. With just the final exam left to take, she currently has an average of 92 on her exercises. The quizzes count for 40%, exercises count for30% of the class grade. What is the minimal grade that Isabella must have on ...

Business
Robert recently was hired as a technician in the firm. He is being paid $1,250 every two weeks ( after taxes). His monthly bills are: Rent: $900 electricity: $110 car payment: $350 car insurance: $60 fuel for cars: $90 groceries: $180 credit cards: $250 Given Robert's expe...

Business
CAN ANYONE ANSWER THIS QUESTION

Business
Isabella is hoping to get an A on her college Algebra course. With just the finaL exam left to take, she currently has an average of 85 on her quizzes and average of 92 on her exercises. The quizzes count for 40%, exercises count for 30% of the class grade. What is the minimal...

Business
A basic car rental charges a daily rate of $29 a day plus $.20 a mile. Suppose that you rent a car for a day and your bill ( before taxes ) is $79. How many miles did you the car.

math
please help me I need to finish this so that I can go into grade 11. A new water tower must be equidistant from three communities. They are located at (-25, 20) (-5, -40) and (15, 30). Find the coordinates of the point where the water tower should be built which i am assuming ...

Lockers
I'm starting middle school and during the orientation they let us try out our lockers with our combination. I couldn't open it so my parents just told me that I would learn during school. It's the 3rd day and I still can't open it that good. Can anyone help me? D:

math
please help me I need to finish this so that I can go into grade 11. A new water tower must be equidistant from three communities. They are located at (-25, 20) (-5, -40) and (15, 30). Find the coordinates of the point where the water tower should be built which i am assuming ...

math
Find the inverse of an invertible function f(x). Use the figure to find the following: ƒ−1(-2)= ƒ−1 (-1)= ƒ−1(0)=

chemistry
the density of water at 40c is 0.992g/mL. what is the volume of 1.95 of water at this temperature

Algebra
Discuss the relationship between the FOIL method for multiplying polynomials and the distributive property of multiplication.

College Physics
I keep getting answer wrong. I don't know what I did wrong. I really need help please. I need help with 1 question. Can you help with this please if you don't mind? 1) Suppose you are given that z = c y^3/x^2 where c is some number. For a particular value of c, x and y...

MATH
A company sells cardboard that is thick. Write an equation to solve for the number of sheets of cardboard, c, in a pile that is thick. What must be done to both sides to solve the equation?

MATH 5TH GRADE (VARIABLES AND EXPRESSIONS)
123

Physics
A man walks with an average speed of 1.3 m/s for 45 minutes. How far has he walked?

Geometry
If the size of a rectangle's area is twice as large as the size of it's perimeter, and the length of one of its sides is 4.5, what is the length of the other side?

Geometry
The area of a 300' by 400' rectangle is doubled by adding a strip of width around the perimeter. Approximately how wide is that strip?

math
A pendulum bob swings 6.0 cm on its first oscillation. On each subsequent oscillation the bob travels 1/3 of the previous distance. Find the total distance the bob travels before coming to rest.

English 125 introduction literature
major similarities and differences between the forms of drama, poetry, and the short story.

Physics
It's really 1 F 2 A 3 F 4 C I just did the assignment

physics
why it is easier to tear a paper towel off a full roll than a mostly used one?

Math
To open the chest of shells the souvenir merchant must enter a code. As his memory is poor, to remember the code he has filled in this speech bubble so that every statement is correct. What is the code? ? X number 1, ? X number 2, ? X number 3, ? X number 4. The multipliers ar...

algebra 2
t-9(t+11)

Chemistry
A metal element (M) forms a hexadentate complex with the ligand ethylenediammine (en). Its formula is M(en)32+. The metal ion and the ligand do not absorb in the visible region of spectrophotometer and a 1.00 cm cuvette, the following absorbances were measured for various conc...

math
how do you put 1/4,2/3,-7,8,-9 in order

math
3260

math
3260

science
A chair of mass 15.5 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 42.0 below the horizontal and the chair slides along the floor.Use Newton's laws to calculate the normal force ...

math
$0.10

math
Find the remainder when 1!+2!+...+299!+300! is divided by 21

math
Noting that 247=(13)(19), find the remainder when 13^18+19^12 is divided by 247

number theory
Find the remainder when 1!+2!+...+299!+300! is divided by 21

number theory
a) Find the last two digits(units and tens digit) in 1829^(1829) b) Find the units digit in 23^(7777)

number theory
Find the remainder when 1!+2!+...+299!+300! is divided by 21

number theory
Find the least positive integer that leaves the remainder 3 when divided by 7, remainder 4 when divided by 9, and remainder 8 when divided by 11

math
65.25 is 25% of what number

Physics
A police car traveling at 94.5 km/h is traveling west, chasing a motorist traveling at 77.2 km/h. (a) What is the velocity of the motorist relative to the police car? The magnitude and its direction (b) What is the velocity of the police car relative to the motorist? The magni...

Math
Yes! Thanks!

Math
If xΩy is defined as the smallest integer of which both x and y are factors, then 10Ω32 is how much greater than 6Ω20?

Math
The null and alternate hypotheses are: H0: π1 ≤ π2 H1: π1> π2 A sample of 100 observations from the first population indicated that X1 is 70. A sample of 150 observations from the second population revealed X2 to be 90. Use the .05 significance le...

math
A river has a current of 4 mph. Find the speed of Simon’s boat in still water if it goes 40 miles downstream in the same time as 24 miles upstream.

Finance
why a firm might deviate from the matching principle by financing short-term assets with long-term debt. How would such a policy have affected a firm during the financial crisis?

math
Amy can clean the house in 7 hours. When she works together with Tom, the job takes 5 hours. How long would it take Tom, working by himself, to clean the house?

math
john takes 3hours longer than andrew to peel 400 pounds of apples. if together they can peel 400pounds of apples in 8hours then how long would it take john if he is working alone.

math
Frank can type a report in 4 hours and James takes 6 hours. How long will it take the two of them typing together?

math
A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed.

math
The speed of a stream is 6 mph. If a boat travels 52 miles downstream in the same time that it takes to travel 26 miles upstream, what is the speed of the boat in still water?

Statistics
Suppose you and a friend each take different random samples of data pairs (x,y) from the same population. Assume the samples are the same size. Based on your samples, you compute r=0.83. Based on her sample, your firmed computes r=0.79 Is your friends value wrong? Explain?

Math( Geometry)
All three planes in the figure provided are parallel. They are cut by lines containing points A, B and C and X, Y and Z. Each of these points lies in a plane. If BC=8 cm, YZ=10 cm and XY=14 cm, find AB. A.)10 1/2 cm B.)10.2 cm C.)11 1/5 cm

Geometry
12x?

Foreign languages
Writeacher, do you know anything about English conversation lessons on Skype? Can you please suggest sites which offer online conversation courses? Thank you for your invaluable help! My sister would like to take one-hour conversation lessons every two days with an English mot...

Foreign languages
Can you check these sentences, Writaecher? 1) Can you please tell me how far ...... hotel is from the beach? 2) As a matter of fact, I was looking for a hotel on a seafront. Do you think I should opt for the ..... Hotel?

math
The times for completing one circuit of a bicycle course are normally distributed with a mean of 81.7 minutes and a standard deviation of 8.6 minutes. An association wants to sponsor a race and provide prizes for the top (that is, fastest) 15% of riders. Where should they expe...

Foreign languages
Can you please check these sentences, Writeacher? 1) I would like to book a room with a double bed and a single bed (at a certain price) for person (sharing) which (alsoincludes breakfast and dinner for seven nights. (Can you help me express this sentence better?) 2) Prior to ...

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