Friday
August 1, 2014

Posts by John


Total # Posts: 6,202

physics
As a bowling ball of radius 15.9 cm rolls down the alley to the right, a frictional force of magnitude 1.46 N, directed to the left, acts on it. Find the frictional torque with respect to an axis through the center of the ball.

math
If 15 marbles are 3/5 of the marbles in a bag. how many are in the bag?

Maths
I am a 2 digit number .the sum of my digits is 9.i am divisible by 5 and smaller than 50. What is my number

trig
5sin(2x)+4cos(x)=0

trig
5sin(2x)+4cos(x)+0

math geometry
a rectangle has an area of 104 cm square? if the lenght is 3 cm less than twice the width what is the length of the rectangle

Finance
Firm A has $10,000 in assets entirely financed with equity. Firm B also has $10,000 in assets, but these assets are financed by $5,000 in debt (with a 10 percent rate of interest) and $5,000 in equity. Both firms sell 10,000 units of output at $2.50 per unit. The variable cost...

Math
4*(z)=1/4*(y)

Trigonometry
first you would want to convert feet to miles or vice versa. Then, youll want to build the triangle because you start at 40,000 feet and then that goes at a six degree angle along the x axis for 20 miles. So you will want to put this on a cartesian plane because from there you...

Trig.
finnd a possible measure of the angle drawn in standard position that passes through the points (ã2,-ã2)

english
What is the underlying message of all of Arthur Jarvis’s writing? How does reading his son’s writing affect the behavior of James Jarvis?

Math(Thank you for your help)
P.E.M.D.A.S

trig
120, 240, and 300

Trig
my mistake, I forgot to put the 4 underneath the sq root of 15

Trig
cos(x)=(4^2-1^2)^(1/2). If your csc=4, then build your right triangle and if csc(x) is hyp/opposite, then you should get what i have put above. Hope this helps

calculus
Estimate the volume of the solid that lies below the surface z = xy and above the following rectangle. R = (x, y)|8 ≤ x ≤ 14, 4 ≤ y ≤ 8 Use a Riemann sum with m = 3, n = 2, and take the sample point to be the upper right corner of each square. (b) Use t...

math
Ethan , Marta , and Roscoe found a large aluminum ring, 10 feet in diameter, in a field about 100 feet behind Ethan's house.They estimated the number of complete revolutions that the ring would take if they rolled it to the house. Ethan estimated 10 revolutions, Marta esti...

Economics
Why is there such a wide variety of desired goods and services in a market?

Economics
Help Please! How does self-interest help achieve society’s economic goals?

physic
A long straight horizontal wire carries a current = 3.90 A to the left. A positive 1.00 C charge moves to the right at a distance 1.50 m above the wire at constant speed v = 5000 m/s. What is the magnitude of the magnetic field at the location of the charge due to the current-...

Chemistry
How much heat is associated with the burning of 2.27 g of methane in the following unbalanced reaction: CH4(g) + O2(g) →CO2(g) + H2O(g)?

Chemistry
Given the following hypothetical equations, 2A + B → 3C + 2D ΔH = -46.7kJ C → B ΔH = 13.1kJ 2E → B ΔH = 84.5kJ, what is the enthalpy change (kJ) for the following reaction? A → D + 2E

Chemistry
Thanks for all the help Bob!

Chemistry
The molar mass of an unknown salt is 63.5. If 4.81 g is added to 81.1 mL of water the temperature changes from 20.95oC to 21.62oC. What is the molar heat of solution (J/mol) of the salt? (Assume all of the heat is transfered to the water) Express your answer to the nearest who...

Chemistry
What kind of orbital is designated by the quantum numbers (3,1,1,1/2)? Answer s, p, d, or f only.

math
123/3=41. 41*2=82 students

4th grade math
4 out of 5 because there are 5 total marbles, and 4 are blue. Thus the probability is 4/5. Your answer should be d. not here.

Biology
Try a bar graph with type of medication on the y axis and time in hours on the x axis. Your bars will be horizontal.

US HISTORY
Thank u very much

US HISTORY
thank u, are there any others because my teacher said almost 5 of em

US HISTORY
How does Prohibition on alcohol during the 1900's affect today life

calculus
If 0 degrees < x < 180 degrees, what values of x, to the nearest degree, are the solution to the equation 2tan to the square x + 5tanx - 12 = 0

calculus
For part B, your figure there is an ellipsoid, x^2+y^2+z^2=4, so the domain should be (x,y,z):X<4,y<4,z<4

calculus
f'(x)=3x^2+2xy^2+1 f'(Y)=2x^2+3y^2+1 f'(xy)=4xy f'(yx)=4xy

Math
You are correct on the time, but it needs to be simplified if not put into decimal form. Now you need to plug in 2 into the orignal problem and get a resultant, then plug in three to the original problem as well. If they are the same resultant then they follow rolles theorem. ...

Chemistry
If 14.0 kilograms of Al2O3(s), 57.4 kilograms of NaOh(l), and 57.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced?

Calculus-derivatives
Yes for both. Growth and decay problems are awful, just letting you know

math
Plug 10 into the x value. f(10)=7(10)+8 F(-6)=7(-6)+8 and so on...

calculus
dy/dx= [5x^4e^(x^4)+4x^3*e^(x^4)*5x^4]* [(x^5)(e^(x^4)]

Singapore Math
still confused

Pre-Cal
Get you a ti-83 and graph it...should show you all of this

Calculus
Since you have found your derivative you then need to move on and find its critical values(where the derivative equals zero). Then if those numbers are within the interval [1,4] you must also plug those into your orignal function. If they do not, then they should be disreguard...

Trig
(sinxcosy+cosxsiny)(sinxcosy-cosxsiny)= Then, foil those and your middle two terms should cancel out leaving you with sin^2xcos^2y-cos^2xsin^2y= now using the pythagereom theorem change all the sin^2's to cos^2 giving you cos^2y-cos^2xcos^2y-[cos^2xcos^2xcos^2y]= cos^2y-co...

Trig
First off these are usually not this hard...just saying...ill be changing your alphas to x's and your betas to y's we will work with the left side because it is easier. use identity sum and difference sin(x+y)sin(x+y)=cos^2y-cos^2x s

Trig
its the square root of 49+121

math (Ms.Sue)
you are correct

trig
a). secx=-2 2pi/3 and 4pi/3 b). sinx=(2^(1/2)/2 its that value at pi/4, and 3pi/4 c). cosx=+ or - 1, so if they want multiple answers its 0, 2pi, and pi

math
A rectangle has width w and its length is 4 units longer than 2 times the width, or 2w + 4 . Write a polynomial for the area of the rectangle.

Algebra
A rectangle has width w and its length is 4 units longer than 2 times the width, or 2w + 4 . Write a polynomial for the area of the rectangle.

calculus
e^x+-2xe^-x^2

calculus
Consider the curves y = x^2and y = mx, where m is some positive constant. No matter what positive constant m is, the two curves enclose a region in the first quadrant.Without using a calculator, find the positive constant m such that the area of the region bounded by the curve...

Advanced Algebra
John is making a sundae. If there are 13 flavors of ice cream, 9 different toppings, and 4 types of nuts, how many different sundaes can he make if he chooses one of each?

Algera
Ms. Pecho currently owes $637.50 simple interest on a loan of $2500 at a anual inteest ate of 17%. How long has she had the loan?

Career
What are the best ways to market a insurance and risk management company? business sells paper and promises, I can't give discounts and I don't have control of the cost of the insurance or how claims are handled.

marketing2
explain what i have to do with this assignment?

Physics Please help!
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...

Geometry
(3X2)x2+(2x7.5)x2+(3X7.5)x2= surface area 3x2x7.5= volume

Physics
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...

geometry
10/(cos(50))=length of ladder

math
Abe has 9 pens. How many more pens does Abe need to have 12 pens. Write an equation.

college algebra
You are given the XY coordinates. Take Time to be X, and Temperature to be Y. Create a graph on a Cartesian coordinate system. A) If done correctly your linear Regression should be Y=-10X + 2350. B) Your slope is -10. Meaning that for every 1 minute the pottery cools by 10 deg...

Taxes
In the US, we have a progressive tax system, which means higher incomes are taxed at a higher rate. But capital gains are not - they are taxed at a flat rate of 15%. This is an example of an institution, a formal "payment" rule, that affects the "tax game"...

Student
lmao, I just literally lol'ed at those comments.

statistics
In this unit we have worked with scores and their locations within a distribution. This discussion is designed to get you to think a little more about distributions of scores. Shown below are two samples of scores. Input these scores into SPSS and use plots and data descriptio...

physics
A ball rolls with a speed of 4.4 m/s toward the edge of a table that is 1 m above the floor. The ball rolls off the table. a. How long is it in the air? s b. How far out from the edge of the table does the ball hit the floor? m

math
What is the angle formed if there is a rise of 10 inches over a run of 57 inches?

physics
Find the gravitational force exerted by a 0.515 kg mass on a 0.108 kg mass 1.94 m away.

physics
Find the acceleration of the block of mass M = 4.79 kg (m = 4.03) (KE = 0.1)

physics
A person of mass 84.5 kg is initially at rest on the edge of a large stationary platform of mass 150 kg, supported by frictionless wheels on a horizontal surface. The person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a vertical distance of ...

physics
A skater of mass 74.0 kg initially moves in a straight line at a speed of 4.60 m/s. The skater approaches a child of mass 45.0 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?

physics
A bowling ball weighing 43.0 N initially moves at a speed of 4.90 m/s. How long must a force of 51.0 N be applied to the ball to stop it?

geometry
if a painting has a perimeter of 36 in, and the length of the picture is 8 inches. then what is the width?

Physics
Biomedical measurements show that the arms and hands together typically make up 13.0% of a person's mass, while the legs and feet together account for 37.0% . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the s...

Economics
B. Suppose there are two goods, Cloth and Food, and two factors of production, labour and capital. Suppose that the production function for each good is "homothetic". Put capital K in the vertical axis and labour L in the horizontal axis. For Cloth production, for an...

Physics help please!!!
Biomedical measurements show that the arms and hands together typically make up 13.0% of a person's mass, while the legs and feet together account for 37.0% . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the s...

calculus
Evaluate the integral S x/(sqrt(3x-1))dx Use U-Substitution method.

College Algebra 1050
Assume you are on a planet with a gravity constant g (instead of 32 feet per second squared) and a speed of sound c (instead of 1100 feet per second), and that you hear the impact of the rock after t seconds. Then the depth of the well is x feet, where your answer depends on g...

math
Three pennies are tossed into the air.What is the probability they will match either heads-heads-heads or tails-tails-tails when they land?

math
One estimate for the distance from earth to the andromeda galaxy is 2,400,000 light years. What is this distance expressed in scientigic notation?

math
jasmine bought 26 pieces of fruit.she bought 6 oranges.she bought twice as many apples as oranges,and twice as many oranges as bananas.she also bought some pears.

calculus
Differentiate both sides of the double angle identify sin 2x= 2 sin x cos x to determine an identify for cos x. Find the first derivative, second derivative, third fourth, fifth, sixth, seventh and eighth derivative. Use the results to find the twelfth and fifteenth derivative...

chemistry
In a lab experiment I added Br2 to hydrocarbons cyclohexane, cyclohexene, and toluene. A loss of color would indicate a reaction took place. Only the cyclohexene lost color and turned clear. I guess this means that the Br2 broke the cyclohexenes double bonds but why didn't...

chemistry- solubility
hydrocarbons nhexane, cyclohexane, and toluene are are insoluable in H2O (i assume because the hydrocarbons are non polar and water is polar) but why are these three hydrocarbons soluable in CH2Cl2?

pre-cal
a) S=cA^k b) A=2Ao K=2 S=c(2Ao)^2=c*2^2*Ao^2 S=4cAo^2 therefor the # of species increased by 4.

Visual Literacy
What are the factors that determine whether or not a print design can be classified as "good design?"

Algebra
STILL DONT GET THIS can anyone explain me this please a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS

Algebra
so answer is 1216

Algebra
a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS

Calculus
An infinite number of points lie on the curve and there is a tangent line at every point. So may they were asking how many times the tangent not exists. The tangent would not exist if the derivative was undefined at some point. Since the derivative is a polynomial it is define...

Calculus
v(t)=s'(t)=150-32t set s(t)=200 find out when the rock is 200 feet above the ground. 200=150t-16t^2 t=(5/16)+or-(15-sqrt(97)) 0=150t-16t^2 t=75/8 not 0 because it started on the ground the velocity when it strikes the ground is v(75/8)=-150 the other velocity is v((5/16)+o...

artist
What inspired Pablo Picasso to paint Weeping woman? Please give some historical context. Thanks

Physics help please!!!
so 570rpm*2pirad = 3581.415625 i divide that with rev*1min/60 sec == 59.69 is that correct ??

Physics help please!!!
The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be constant, what is the angula...

physics
Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.20 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 9.00 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision.

Geometry
140

Physics please help its urgent i need help
A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the f...

Physics to drwl please help
A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the f...

Social Studies
D I think

Wow is there no one to help with physics???
I got the rest bobpursley but for some reason am not getting the right answer for part b which friction=ma but when i put 209(2.1) the answer isnt right

Wow is there no one to help with physics???
Thanks bobpursley

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