# Posts by josh

Total # Posts: 1,867

Physics
An FM radio station broadcasts at 80.9MHz. Determine the period of the radio waves. i know period is just 1/freq. so what would i convert 80.9 MHz into???

college economics
A decrease in aggregate supply means: A. Both the real domestic output and the price level would decrease B. The real domestic output would increase and rises in the price level would become smaller C. The real domestic output would decrease and the price level would rise D. ...

chemistry
the h20 and s02 you do not have any carbon though to work with it?

chemistry
What mass of carbon dioxide, water, and sulfur dioxide can be produced from the combustion of 1.5793g of C7H12S?

Chemistry
Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?

Chemistry
Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH. Please help!

Chemistry
Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH.

Chemistry
Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?

math
48 divided by 3796

organic chem
convert butane to 3-pentanol using any reagents and organometalics.

Chemistry
Cl is gaining elections which means it is the reduction half reaction. Reduction is associated with the Cathode. E(cell) = E(cathode) - E(anode) 0.35v = 1.36v - E(anode) solving for E(anode) gives you 1.01v

geometry
Given quadrilateral ABCD, with A = 4x - 57 and C = x + 3, what value of x ensures that ABCD is a parallelogram?

algebra
How do you make 36 the area and 26 premeter

math Dr. R
ok. "what is 1/3 of \$3900" and if i would be using a calculator how would i input it

math
if im trying to get the answer to "what is one third of 190" how would i input it on a calculator

math
yes, but iknow the answer, my issue is is how do i get answer if im trying to use a calculator

math
if im trying to get 1/3 from 190, how would i get the answere by calculator

chemistry
Help!! Can someone please show me how to set up this problem. I'm lost. C3H8+5O2-->3CO2+4H20 If 19.2g of C3H8 and 19.2g O2 react, how many moles of CO2 can be produced?

chem
How do you find out the final Fe

english
Wut is a compound predicate

Physics
A woman runs a kilometer using a force of 210 N and a power output of 500 W. How long in minutes does it take this woman to complete 1 kilometer?

chemistry
so is is set up like 356.2J=25.0g(36.5C-22.0C) ?

chemistry
a 25.0g sample of magnesium at 22.0 degrees C absorbs 356.3 J of heat. The temperature of magnesium rises to 36.5 degrees C. What is the specific heat of the magnesium?

biology
Yes there still would have been a source of carbon dioxide being introduced into the water. "Carbon Dioxide is present in water in the form of a dissolved gas.Surface waters normally contain less than 10 ppm free carbon dioxide, while some ground waters may easily exceed ...

Chemistry
Is it still a single displacement reaction? can you walk me through predicting the reaction and then balancing it. I'm lost.

Chemistry
Can anyone tell me why the answer that I got here is not correct? Pb(s) + AgNO3(aq) yields Ag(s) + PbNO3(s)

what does s, f,scs, scv mean when indentifying(labeling) sentences thanks

Signals
I have the following information: H(jw) = (3+jw)/(e^(2jw)) f(t) = e^(-3t)u(t) Therefore, F(w) = 1/(3+jw) Y(w) = H(w)*F(w) = 1/(e^(2jw)) I have to find y(t), but I am having troubling finding.

physics
A model rocket is constructed with a motor that can provide a total impulse of 25.5 N · s. The mass of the rocket is 0.213 kg. What is the speed that this rocket achieves when launched from rest? Neglect the effects of gravity and air resistance.

chemistry
how many atoms are in 26 moles of Ag

algebra
I don;t know how to solve the following equation. 9+6x=-6x+105 I have -6x +6x -105 -105 -96=12x 12 12 x=8

algebra
I don;t know how to solve the following equation. 9+6x=-6x+105 I have -6x +6x -105 -105 -96=12x 12 12 x=8

math
how do you solve 0.32/8.64=

math
write an expression.there were22 students in the clsass but some were absent

math
find the value of expression 5+2+6 (8-7)+1 6-(3+1)

vix = 4.33 viy = 2.5 vx = 4.33 viy = -2.5 vix= 5 * cos(30) viy= 5 * sin (30) vx= the same because no force is acting on it vy= -viy because nature of parabolic motion and ball is travelling down

maths
a fasrmer has 46 animals.He has fewer 6 sheep than pigs. how many pigs does he have?

Organic Chemistry Lab
The solid pellet will contain the waxes, cellulose, and salt crystals. The supernatant will contain the pigments, water, sugars,and starch.

Add one set of parentheses to the expression - 7 * x + 3 + 8 * x + 3 * x + 8 - 9 so that it is equivalent to 2(9x + 10)

us history
Distinguish between "older culture" and "new culture" present in 18th century colonial America, and discuss the value conflict that emerged between the two.

organic chem
7. An unknown compound, C8H14, is optically active. Hydrogenation of the unknown yields 4-methylheptane. Ozonolysis of the unknown yields ethanol and 2- methylpropandial. Suggest a structure for the unknown consistent with the above date. please help

physics
A boat initially traveling at 10 meters per second accelerates uniformly at the rate of 5.0 meters per second squared for 10 seconds. How far does the boat travel during this time?

Chemistry
The law of conservation of mass states that no change is observed in the total mass of the substances involved in a chemical change. Thus the mass of the sulfur dioxide produced is the same amount as the sulfur and oxygen that went in. Does this sound correct to answer my ...

Chem
Is this on the right track?.....mass cannot be created/destroyed, although it may be rearranged in space, and changed into different types of particles. This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products.

Chem
Sulfur burns in the presence of oxygen to produce sulfur dioxide. Explain how the mass of sulfur dioxide produced compares to the combined mass of sulfur and oxygen.

physics/ math
Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

physics
A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?

math
explain how you could show five less than a number using an expression

Chemistry 20
If 40. kJ of energy are absorbed by 450 g of water at 16 oC, what is the final temperature of the water?

Related Rates Problem

grammar
what is the simple predicate in The insects bodies can turn wood into food?

algebra
the equation is f(x) = (1/sq. root of 1-x^2) 1. f(x) is never zero. 2. 0 is in the domain of f 3. All negative real numbers are in the domain of f 4. All positive real numbers are in the domain of f 5. 1 is in the domain of f 6. f(x) is never negative 7. f(x) is never positive...

math
r=13.14

math
-3.38=r-9.76

science
Water, Oil, and sediment

German
This was a worksheet and the instruction said to fill in the adjective endings, since the underlines wouldn’t show I put the spaces to be filled as parenthesis. The (-) means I think it does not need an ending and the (?) means im confused and not sure if it needs an ...

Physics

Physcis
An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b. 2/3>Vplane ...

Chemistry
A 279 lb fullback runs the 40 yd dash at a speed of 18.5 ± 0.1 mi/h.(a) What is his de broglie wavelength (in meters)?(b)what is the uncertainty of his position?

Physics
I have a problem with an atwood's machine problem. i have three tensions where T1 and T2 are on the left and T3 is on the right. Bottom left corner is block 2kg with T1 then another block 2kg with T2 on the left side. On the right side i have a block of 7kg with T3. I am ...

Physics
This is what i've done: (i) T3sin 47 = mg (ii) 37 = T3cos 47 so i said T3 = 54.2523 N 54.25(sin47)/g = m m = 3.96776 kg

Physics
In the figure below the left hand calbe has a tension T1 and makes an angle of 42 with the horizontal. the right hand calbe as a tension T3 and makes an angle of 47 with the horizontal. The horizontal cable connecting the two masses has a tension of 37 N. Determine the mass M2.

Algebra
What is the problem precisely? What is the question?

Algebra
I think the question is asking you if the function f(x) equals 8 WHEN x equals 8; true of false? since the function is f(x)= x + 8 the answer is false because 8+10=18

PHYSICS
Since average a= delta v/ delta t 340(.05)= delta v v=17 m/s Furthermore this launch velocity has the angle of 51 degrees. You then use your handy dandy trigonometric skills to find the horizontal and vertical components of the launch velocity. 17cos(51)= horizontal find the ...

math
if a^2 + b^2 = c^2 *equation for right triangles and c in your case is 32 meters and because the obj. is a squared the sides are equal to each other therefore: 2x^2 = 32^2 x = side of square AREA= x^2 therefore : x^2 = (32^2) / 2

physics
You need an initial velocity

21=5-3=7-9*2=

Anatomy
If you stand with your arms down at your sides and lift them up to shoulder height is that Adduction or Flexion?

science
what is the scientific notation for 280 mm?

geometry
Rays PQ and QR are perpindicular. Point S lies on the interior of angle PQR. If m<PQS=4+7a and m<SQR = 9+4a, find m<PQS and m<SQR

math
One year, China consumed 4 times as much energy as Brazil.Define a variable and write an expression for the amount of energy China used that year.I don't get the variable part and expression. Not the same person.

math
One year, China consumed 4 times as much energy as Brazil.Define a variable and write an expression for the amount of energy China used that year.I don't get the variable part and expression. Not the same person.

college
a rock is dropped off a bridge. How fast is it moving when it hits the water 2.5s later?

Mayans and aztecs
how did the aztecs acquire most new pieces of land

math
(17-5)(6+5) Do you know what's an expression is? Can you teach me how to do it?

math
(17-5)(6+5)

math
It means 14 divide by 2

math
14/2+3(5)

math
so, what's the right problem??????????

Math
Dave has quarters, dimes and nickles in his bank. He has 3 more dimes than quarters and 6 less nickles than quarters. There are 63 total coins. How many are quarters?

what is a root word

PHYSICS LEC
please help...i need this immediately.. rolling friction. two bicycles are set rolling with the same initial speed of 3.50m/s on a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40psi ...

geometry
The length of a rectagle is 9 centimeters more than half the width. Find the legth if the perimeter is 60 centimeters.

chemistry
What mass of solute is needed to prepare 140 mL of 0.560 M KCl? how do i work this out?

PHYSICS LAB
a gold ball is hit with an initial velocity v0 = 53m/s at an angle of 50degrees above the horizontal. a)how high the ball go? b)what is the total time the ball is in the air? c)how far will the ball travel horizontally before it hits the ground?

physics
A long, vertical, straight wire carries a current I going upwards. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop. The loop is allowed to fall and maintains its orientation with respect to the straight wire while doing...

physics
thanks, Bob!

physics
A step-down transformer has a turns ratio of 1:10 and its primary is connected across the terminals of a standard 120 V wall socket. A 330 ohm resistor is connected across the secondary of this transformer. What power P is dissipated in the resistor?

physics
The primary coil of a transformer is connected to a standard wall socket. A resistance R is connected across the secondary coil. The resistance across the secondary coil is increased. What happens to the current in the primary coil, and what happens to the power being supplied...

PHYSICS
if by some suitable mechanism the falling body had been given an initial downward push instead of just being released, would the resulting value of (g) acceleration due to gravity have been different?why? tnx....please answer it...

PHYSICS
a)speed is the magnitude of instantaneous velocity. Is the average speed equal to the magnitude of the average velocity? Justify b)under what condition is the average equal to instantaneous velocity? c)a car travels 40 mph for 2 hrs and 60 mph for 3hrs.what is the average speed?

Eth 125
Ms. Sue. If you are uneducated enough as to refer to the concept of orientalism as people from asian countries. Please check your facts before posting answers. Orientalism clearly defined is answer C

physics
the forces on the table act on a ring but are said to be concurrent. if the cords were rigidly to the ring would the forces necessarily be concurrent?? will you please give me some explanation answers about this...thanks a lot..

pHysics
yeah...tnx drwls...you're the best...how can you answer all those questions in just one click... i hope to have that kind of knowledge too.. tnx again

pHysics
a rope 26 ft long is attached to two points A and B, 20 ft apart at the same level. A load of 250lb is carried at the middle of the rope. what force is exerted on A. please answer this immediately i need it...thanks a lot...

physics
a brick is dropped (0 initial speed) from the top of a building. the brick strikes the ground in 2.5 seconds. you may ignore air resistant so the brick is in free fall. A)how tall in meters is the building? B) what is the magnitude of the brick's velocity just before it ...

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